TWI868589B - Multiple micronano bubble treatment method and system thereof for severe oil polluted soils - Google Patents

Abstract

A multiple micronano bubble treatment method includes: analyzing a pollutant concentration of an oil-polluted soil contained in a first tank to obtain a pollutant concentration feature; according to the pollutant concentration feature, supplying a first micronano bubble liquid to the oil-polluted soil in the first tank to generate a plurality of first micronano bubbles to treat a plurality of oil-polluted soil particles; bursting of micronano bubbles among the plurality of oil-polluted soil particles separating it into a first treated soil and a first separated pollutant liquid; containing the first treated soil in a second tank and supplying a second micronano bubble liquid to the first treated soil in the second tank to generate a plurality of second micronano bubbles to treat a plurality of oil-polluted soil particles; and bursting of micronano bubbles among the plurality of oil-polluted soil particles separating it into a second treated soil and a second separated pollutant liquid.

Description

Multiple micro-nano bubble treatment method and system for heavily oil-contaminated soil

The present invention relates to a multiple micro-nano bubble treatment method for severe oil polluted soil and a system thereof; in particular, to a multiple micro-nano bubble treatment method for severe diesel polluted soil and a system thereof; more particularly, to a multiple micro-nano bubble explosion shock wave, energy release and hydrogen free radical treatment method for severe oil polluted soil and a system thereof.

Related micro-nano bubbles are commonly used to treat oil-contaminated soil treatment methods and systems, such as: the invention patent of the Republic of China Patent Publication No. TW-I760027 previously applied by the inventor, "Method and system for treating oil-contaminated soil with micro-nano bubbles", which discloses a method for treating oil-contaminated soil with micro-nano bubbles, and the method for treating oil-contaminated soil with micro-nano bubbles includes the steps of: performing pollution concentration analysis on an oil-contaminated soil to obtain a pollution concentration characteristic.

As mentioned above, the aforementioned method of treating oil-contaminated soil with micro-nano bubbles in TW-I760027 further includes the steps of: transporting a micro-nano bubble liquid into the oil-contaminated soil according to the pollution concentration characteristics; generating a plurality of micro-nano bubbles in the oil-contaminated soil from the micro-nano bubble liquid to contact a plurality of oil-contaminated soil particles; causing a plurality of micro-nano bubbles to rupture and generate a burst shock wave, a release of energy and a plurality of hydrogen radicals between a plurality of the oil-contaminated soil particles, so as to separate from a plurality of the oil-contaminated soil particles to form a separated oil-contaminated liquid; and subjecting the separated oil-contaminated liquid to an oil-contaminated flotation operation.

However, the aforementioned method of treating oil-contaminated soil with micro-nano bubbles in TW-I760027 simply uses micro-nano bubbles to generate and rupture to treat oil-contaminated soil. Therefore, it is only applicable to treating lightly oil-contaminated soil, i.e., it is not completely applicable to the rapid treatment of heavily oil-contaminated soil. Therefore, it is not applicable to the rapid or highly efficient treatment of heavily or seriously oil-contaminated soil.

Another commonly used oil-contaminated soil treatment system, for example: the "Oil-contaminated soil water washing system" invention patent of the Republic of China Patent Announcement No. TW-I688425, discloses an oil-contaminated soil water washing system. In addition, the oil-contaminated soil water washing system includes a first mud and sand separator, a wastewater treatment device, a clean water tank, a scrubbing and flotation device, a second mud and sand separator and a dirty water tank.

As mentioned above, the first mud-sand separator of the aforementioned TW-I688425 is used to receive a first dirty water and an oil-contaminated soil, and use the first dirty water to separate a coarse sand material and a muddy water from the oil-contaminated soil. In addition, the wastewater treatment equipment is connected to the first mud-sand separator, and the wastewater treatment equipment is used to receive and treat the muddy water from the first mud-sand separator to obtain a sludge and a clean water.

As mentioned above, the clean water tank of the aforementioned TW-I688425 is connected to the wastewater treatment equipment, and the clean water tank is used to receive the clean water from the wastewater treatment equipment. In addition, the scrubbing and flotation equipment is connected to the clean water tank and the first mud and sand separator, and the scrubbing and flotation equipment is used to receive the clean water from the clean water tank and the coarse sand from the first mud and sand separator, and scrub and flot the coarse sand to remove the oil stains of the coarse sand to obtain mud and sand water.

As mentioned above, the second mud-sand separator of the aforementioned TW-I688425 is connected to the scrubbing and flotation equipment, and the second mud-sand separator is used to receive the mud-sand water from the scrubbing and flotation equipment, and separate a fine sand material and a second muddy water from the mud-sand water. The muddy water tank is connected to the second mud-sand separator and the first mud-sand separator, and the muddy water tank is used to receive the second muddy water from the second mud-sand separator, and transport the second muddy water to the first mud-sand separator to separate the oil-contaminated soil.

However, the aforementioned oil-contaminated soil water washing system of TW-I688425 only utilizes the combination of the first mud-sand separator, wastewater treatment equipment, scrubbing and flotation equipment, and the second mud-sand separator to repeatedly separate and treat the oil-contaminated soil by water washing. Therefore, it is not suitable for fast or efficient treatment of heavily or long-term oil-contaminated soil.

Another commonly used method for treating oil-contaminated soil is, for example, the invention patent of the Republic of China, "Method for treating oil-contaminated soil with fermented blood", which discloses a method for treating oil-contaminated soil with fermented blood. The method for treating oil-contaminated soil with fermented blood includes: Step 1, mixing fermented blood with oil-contaminated soil and acting for 7 to 14 days.

As mentioned above, the method for treating oil-contaminated soil with fermented blood in the aforementioned TW-I640616 comprises: step 2, adding an oxide to the oil-contaminated soil and acting for 1 day; the oxide is 30% (w/w) hydrogen peroxide [H ₂ O ₂ ], and the oil-contaminated soil is selected to be a heavily oil-contaminated soil.

As mentioned above, the method of treating oil-contaminated soil with fermented blood in the aforementioned TW-I640616 includes: step 3, adding the fermented blood again and acting for 7 to 14 days to remove the oil contained in the oil-contaminated soil; mixing animal blood and anaerobic sludge in a volume ratio of 3:1 to 1:1, and fermenting at a temperature of 26 to 37°C for 30 to 60 days to obtain the anaerobic sludge, and the anaerobic sludge is selected as anaerobic sludge from a food factory.

However, the aforementioned method of using fermented blood to treat oil-contaminated soil in TW-I640616 only uses fermented blood from animal blood, anaerobic sludge from food factories and further adds the oxidant to treat oil-contaminated soil. Therefore, it is not suitable for fast or efficient treatment of heavily or long-term oil-contaminated soil.

Another commonly used method for treating oil-contaminated soil is, for example, the invention patent of the Republic of China Patent Publication No. TW-I558477, "Method for Cleaning Oil-Contaminated Soil Using Liquid Fertilizer", which discloses the use of a liquid fertilizer for cleaning oil-contaminated soil. The use of the liquid fertilizer for cleaning oil-contaminated soil includes: preparing a liquid fertilizer.

As mentioned above, the preparation of the liquid fertilizer in the aforementioned TW-I558477 includes: preparing a bacterial suspension by adding a nutrient source to dechlorinated water to form a bacterial culture solution, inoculating a new type of Trichoderma sp. in the bacterial culture solution, and subjecting the new type of Trichoderma sp. in the bacterial culture solution to an aerobic culture until the rapid growth stage; adding an organic raw material to the bacterial suspension to form an initial fertilizer, and the organic raw material is selected from one of a mixture of kitchen waste, slop, and a mixture of mature compost; subjecting the initial fertilizer to an aerobic liquid fertilization process until the mature composting stage to form the liquid fertilizer, and the liquid fertilizer contains a natural biosurfactant.

As mentioned above, the use of the liquid fertilizer in the aforementioned TW-I558477 for cleaning oil-contaminated soil also includes: performing an off-site cleaning treatment method including: mixing an oil-contaminated soil with the liquid fertilizer to form a soil mixture; stirring the soil mixture; precipitating the soil mixture to separate the soil mixture into layers to form a supernatant; and discharging the supernatant to remove the oil pollutants in the oil-contaminated soil.

However, the aforementioned method of using liquid fertilizer to clean oil-contaminated soil in No. TW-I558477 is only used to inoculate the Trichoderma fungus in the culture medium and add the organic raw materials to prepare the liquid fertilizer (containing natural biosurfactant), and use the liquid fertilizer to perform the off-site cleaning treatment method. Therefore, it is not suitable for fast or high-efficiency treatment of heavily or long-term oil-contaminated soil.

Another commonly used method for treating oil-contaminated soil is, for example, the invention patent of the Republic of China, No. TW-I471162, entitled "Method and device for removing oil contamination from soil", which discloses a method for removing oil contamination from soil. The method for removing oil contamination from soil includes: Step A, setting a raw material input port inside a mixing barrel to inject oil-contaminated soil.

As mentioned above, the method for removing oil pollution from soil in the aforementioned TW-I471162 further includes: Step B, pouring hot water with a temperature of at least 40 degrees Celsius into the mixing barrel, and a hot water pipe for pouring enters the mixing barrel in a tangential direction to the mixing barrel, so that the hot water entering forms a rotating water flow in the mixing barrel.

As mentioned above, the method for removing oil pollution from soil in the aforementioned TW-I471162 also includes: step C, stirring the inside of the mixing barrel; D, using the hot water to suspend the oil pollution in the oil-contaminated soil and to cause the remaining soil to precipitate.

However, the method for removing oil pollution from soil in the aforementioned TW-I471162 only uses the method of pouring hot water into the mixing barrel, the hot water pipe entering the mixing barrel tangentially to the mixing barrel, and stirring the inside of the mixing barrel. Therefore, it is not suitable for fast or efficient treatment of heavily or long-term oil-contaminated soil.

Obviously, the aforementioned TW-I760027, TW-I688425, TW-I640616, TW-I558477 and TW-I471162 systems for treating general oil-contaminated soil, their devices and methods still need further improvement, for example: special treatment of heavily or long-term oil-contaminated soil in a fast or high-efficiency manner. The aforementioned patents are only references to the technical background of the present invention and illustrate the current state of technological development, and are not intended to limit the scope of the present invention.

In view of this, the present invention provides a method and system for treating heavily oil-contaminated soil with micro-nano bubbles in multiple ways to meet the above needs. The method performs pollution concentration analysis on an oil-contaminated soil to obtain a pollution concentration characteristic, and the oil-contaminated soil is placed in a first cleaning tank. According to the pollution concentration characteristic, a first micro-nano bubble liquid is transported into the oil-contaminated soil in the first cleaning tank, and the first micro-nano bubble liquid generates a plurality of first micro-nano bubbles in the oil-contaminated soil, which contact and burst between a plurality of oil-contaminated soil particles to form a The first oil-removed soil and a first oil-separating liquid are placed in a second cleaning tank, and a second micro-nano bubble liquid is transported into the first oil-removed soil in the second cleaning tank. In the first oil-removed soil, the second micro-nano bubble liquid generates a plurality of second micro-nano bubbles that contact and break between a plurality of oil-contaminated soil particles, so as to form a second oil-removed soil and a second oil-separating liquid, so as to greatly improve the cleaning efficiency of oil in heavily oil-contaminated soil (oil-contaminated soil of different degrees).

The main purpose of the present invention is to provide a method and system for treating heavily oil-contaminated soil with micro-nano bubbles in a multiple-type manner, wherein a pollution concentration analysis is performed on an oil-contaminated soil to obtain a pollution concentration characteristic, and the oil-contaminated soil is placed in a first cleaning tank, and a first micro-nano bubble liquid is transported into the oil-contaminated soil in the first cleaning tank according to the pollution concentration characteristic, and the first micro-nano bubble liquid generates a plurality of first micro-nano bubbles in the oil-contaminated soil, which contact and burst between a plurality of oil-contaminated soil particles, so as to form a first deoiled soil. Soil and a first oil-separating liquid, the first oil-removed soil is then placed in a second cleaning tank, and a second micro-nano bubble liquid is transported into the first oil-removed soil in the second cleaning tank, and the second micro-nano bubble liquid generates a plurality of second micro-nano bubbles in the first oil-removed soil, which contact and break between a plurality of oil-contaminated soil particles, so as to form a second oil-removed soil and a second oil-separating liquid, so as to achieve the purpose and effect of improving the cleaning efficiency of oil pollution in heavily oil-contaminated soil (oil-contaminated soil of different degrees).

In order to achieve the above-mentioned purpose, the multiple-mode micro-nano bubble treatment system for heavily oil-contaminated soil of the preferred embodiment of the present invention includes:

A first cleaning tank, which is used to accommodate oil-contaminated soil, and the first cleaning tank is used to perform a first oil removal treatment operation on the oil-contaminated soil;

1. A pollution concentration characteristic obtained by conducting pollution concentration analysis on the oil-contaminated soil;

A second cleaning tank, which is used to perform a second oil removal treatment operation on the oil-contaminated soil;

At least one micro-nano bubble generator, which transports a first micro-nano bubble liquid into the oil-contaminated soil in the first cleaning tank according to the pollution concentration characteristics, and transports a second micro-nano bubble liquid into the second cleaning tank by the micro-nano bubble generator; and

At least one micro-nano bubble distribution pipeline set, which respectively connects the first cleaning tank and the second cleaning tank to the micro-nano bubble generator;

The first micro-nano bubble liquid generates a plurality of first micro-nano bubbles in the oil-contaminated soil and contacts a plurality of oil-contaminated soil particles, and the plurality of first micro-nano bubbles are generated and ruptured between a plurality of the oil-contaminated soil particles, so as to separate from the plurality of the oil-contaminated soil particles to form a first oil-removed soil and a first separated oil-contaminated liquid; and

The first de-oiled soil is placed in a second cleaning tank, and a second micro-nano bubble liquid is transported into the first de-oiled soil in the second cleaning tank, and the second micro-nano bubble liquid generates a plurality of second micro-nano bubbles in the first de-oiled soil to contact a plurality of oil-contaminated soil particles, and a plurality of the second micro-nano bubbles are broken between a plurality of the oil-contaminated soil particles, so as to separate from the plurality of the oil-contaminated soil particles to form a second de-oiled soil and a second separated oil-contaminated liquid.

The pollution concentration characteristic of the preferred embodiment of the present invention is a pollution concentration characteristic curve or a pollution concentration characteristic model.

The micro-nano bubble generator of the preferred embodiment of the present invention further includes a gas injector and a gas diffuser or a micro-nano bubble generator.

The first cleaning tank or the second cleaning tank of the preferred embodiment of the present invention further comprises a stirring device to stir and treat the oil-contaminated soil.

The first cleaning tank or the second cleaning tank of the preferred embodiment of the present invention further includes a heating device to heat the oil-contaminated soil.

The first micro-nano bubble liquid of the preferred embodiment of the present invention has a first bubble pressure, and the second micro-nano bubble liquid has a second bubble pressure, and the first bubble pressure is different from the second bubble pressure.

The first micro-nano bubble liquid of the preferred embodiment of the present invention has a first liquid flow rate, and the second micro-nano bubble liquid has a second liquid flow rate, and the first liquid flow rate is different from the second liquid flow rate.

In the preferred embodiment of the present invention, the first micro-nano bubble liquid is a first charged bubble, and the second micro-nano bubble liquid has a second charged bubble, and the first charged bubble and the second charged bubble are selected from a positively charged bubble or a negatively charged bubble.

The micro-nano bubble distribution pipeline set of the preferred embodiment of the present invention has at least one regulating valve unit.

In order to achieve the above-mentioned purpose, the preferred embodiment of the present invention includes the following methods for treating heavily oil-contaminated soil with micro-nano bubbles:

Conducting pollution concentration analysis on oil-contaminated soil to obtain a pollution concentration characteristic, and placing the oil-contaminated soil in a first cleaning tank;

According to the pollution concentration characteristics, a first micro-nano bubble liquid is transported into the oil-contaminated soil in the first cleaning tank, and the first micro-nano bubble liquid generates a plurality of first micro-nano bubbles in contact with a plurality of oil-contaminated soil particles in the oil-contaminated soil;

A plurality of the first micro-nano bubbles are generated and burst between a plurality of the oil-contaminated soil particles, so as to separate from the plurality of the oil-contaminated soil particles to form a first oil-removed soil and a first separated oil-contaminated liquid;

The first deoiled soil is placed in a second cleaning tank, and a second micro-nano bubble liquid is transported into the first deoiled soil in the second cleaning tank, and the second micro-nano bubble liquid generates a plurality of second micro-nano bubbles in the first deoiled soil to contact a plurality of oil-contaminated soil particles; and

A plurality of the second micro-nano bubbles are generated and burst between a plurality of the oil-contaminated soil particles, so as to separate from the plurality of the oil-contaminated soil particles to form a second oil-removed soil and a second separated oil-contaminated liquid.

The pollution concentration characteristics of the preferred embodiment of the present invention include a coarse particle oil content characteristic, a medium particle oil content characteristic and a fine particle oil content characteristic.

The pollution concentration characteristics of the preferred embodiment of the present invention are obtained by calculating a soil particle sorting method and a soil particle oil content.

The first micro-nano bubble liquid or the second micro-nano bubble liquid of the preferred embodiment of the present invention is manufactured by a micro-nano bubble generator.

The preferred embodiment of the present invention adds a surfactant to the oil-contaminated soil.

1: Pollution analysis unit

10a: First cleaning tank

10b: Second cleaning tank

10c: The third cleaning tank

10d: Clarification tank unit

11: Stirring device

12: Surfactant

2: Micro-nano bubble generator

20: Micro-nano bubble distribution pipeline set

2a: First regulating valve

2b: Second regulating valve

2c: The third regulating valve

21: Micro-nano bubbles

22: Micro-nano bubble burst

3a: The first oil pollution flotation unit

3b: Second oil pollution flotation unit

3c: The third oil pollution flotation unit

4a: First heating device

4b: Second heating device

8: Oil contaminated soil

8a: Soil particles

80: Pollution concentration characteristics

81: First, the oily soil has been removed

90: The oil has been removed.

Figure 1: Block diagram of the first preferred embodiment of the present invention, showing a multi-stage micro-nano bubble treatment system for heavily oil-contaminated soil.

Figure 2: Block diagram of the second preferred embodiment of the present invention, showing a multi-stage micro-nano bubble treatment system for heavily oil-contaminated soil.

Figure 3: A side view schematic diagram of the second preferred embodiment of the present invention's multiple micro-nano bubble treatment system for heavily oil-contaminated soil.

Figure 4: Schematic diagram of the process of treating heavily oil-contaminated soil with multiple micro-nano bubbles in a preferred embodiment of the present invention.

Figure 5: A schematic diagram showing the relationship between the diameter of micro-nano bubbles and the internal air pressure in the multiple micro-nano bubble treatment system for heavily oil-contaminated soil of the preferred embodiment of the present invention.

Figure 6: Schematic diagram of the multiple micro-nano bubble treatment system for heavily oil-contaminated soil according to the preferred embodiment of the present invention for micro-nano bubble treatment of heavily oil-contaminated soil.

Figure 7: Block diagram of the third preferred embodiment of the present invention, showing a multi-stage micro-nano bubble treatment system for heavily oil-contaminated soil.

Figure 8: A schematic diagram of the relationship between the oil removal rate and time of the multiple micro-nano bubble treatment method for heavily oil-contaminated soil and the system using various micro-nano bubble pressures of the preferred embodiment of the present invention.

Figure 9: A schematic diagram showing the relationship between the oil removal rate and time of the multiple micro-nano bubble liquid flow rate of the method and system for treating heavily oil-contaminated soil using micro-nano bubbles in a preferred embodiment of the present invention.

Figure 10: A schematic diagram of the relationship between the oil removal rate and time of the multiple micro-nano bubble treatment method for heavily oil-contaminated soil and the system using different micro-nano bubble electrical properties in the preferred embodiment of the present invention.

In order to fully understand the present invention, the following will cite preferred embodiments and provide detailed descriptions with accompanying drawings, which are not intended to limit the present invention.

The preferred embodiment of the present invention's multiple micro-nano bubble treatment method for heavily oil-contaminated soil and its system can be selected and applied in combination to remediate or remove various oil-contaminated soils, land, ports, streams, rivers or lakes that are polluted to varying degrees by oil spills or dumpings in the crude oil mining industry, oil transportation and storage industry, and oil product sales industry, or industrial oil pollution, or can also be selected and applied in combination to remediate or remove various on-site or off-site treatments of oil-contaminated soils, but it is not intended to limit the scope of application of the present invention.

For example, the multiple micro-nano bubble treatment method and system of the preferred embodiment of the present invention for treating heavily oil-contaminated soil adopts the definition of oil pollution as various oil pollution (oil-contaminated soil of different degrees), and the oil products include crude oil, total hydrocarbon, heavy oil or fuel oil, crude oil or various other oil products, but it is not used to limit the scope of application of the present invention.

FIG. 1 discloses a block diagram of a multiple-type micro-nano bubble treatment system for heavily oil-contaminated soil of the first preferred embodiment of the present invention. Referring to FIG. 1, for example, the multiple-type micro-nano bubble treatment system for heavily oil-contaminated soil of the first preferred embodiment of the present invention comprises a pollution analysis unit 1, a first cleaning tank (or cleaning tank unit) 10a, a second cleaning tank (or cleaning tank unit) 10b, at least one micro-nano bubble generator 2, at least one micro-nano bubble distribution pipeline set 20, a first oil pollution flotation unit 3a and a second oil pollution flotation unit 3b, to treat soils with different degrees of oil pollution.

FIG. 2 is a block diagram showing a system for treating heavily oil-contaminated soil with multiple micro-nano bubbles according to the second preferred embodiment of the present invention, which corresponds to the system for treating heavily oil-contaminated soil with multiple micro-nano bubbles in FIG. 1 ; FIG. 3 is a side view diagram showing a system for treating heavily oil-contaminated soil with multiple micro-nano bubbles according to the second preferred embodiment of the present invention. Please refer to Figures 2 and 3. For example, the second preferred embodiment of the present invention includes a pollution analysis unit 1, a first cleaning tank 10a, a second cleaning tank 10b, a third cleaning tank (or cleaning tank unit) 10c, at least one micro-nano bubble generator 2, at least one micro-nano bubble distribution pipeline set 20, a first oil flotation unit 3a, a second oil flotation unit 3b and a third oil flotation unit 3c.

Please refer to FIG. 3, for example, another preferred embodiment of the present invention, the multiple micro-nano bubble treatment system for heavily oil-contaminated soil, further comprises at least one clarification tank unit 10d, and the clarification tank unit 10d can be selectively connected to the third cleaning tank 10c or other units (for example: the first cleaning tank 10a or the second cleaning tank 10b) to treat a treated cleaning liquid.

Please refer to Figures 1, 2 and 3 again. For example, the pollution analysis unit 1 can be selected from a computer unit, and the computer unit includes a desktop computer, a notebook computer or a laptop computer, a tablet personal computer, a workstation computer, a smart phone or other devices with computer functions, and the pollution analysis unit 1 can be combined with a particle sorting unit to analyze soil particles, that is, soil particles with different degrees of oil contamination.

Please refer to Figures 1, 2 and 3 again. For example, the first cleaning tank 10a, the second cleaning tank 10b or the third cleaning tank 10c can be selected from a soil containing box, a soil containing chamber, a container for samples to be tested, a carrier for samples to be tested, a collector for samples to be tested, a testing device for samples to be tested, a simulated experimental device for samples to be tested, an artificial environment device for samples to be tested or a container with similar functions.

Please refer to Figures 1, 2 and 3 again. For example, the first cleaning tank 10a is used to perform a first oil removal treatment operation, the second cleaning tank 10b is used to perform a second oil removal treatment operation, and the third cleaning tank 10c is used to perform a third oil removal treatment operation, and other cleaning tanks can be selected to perform an oil removal treatment operation in the same manner.

Please refer to Figures 1, 2 and 3 again. For example, the micro-nano bubble generator 2 is arranged between the first cleaning tank 10a, the second cleaning tank 10b and the third cleaning tank 10c by appropriate technical means (e.g., liquid delivery pipeline), and the micro-nano bubble generator 2 has a high-pressure barrel or a high-pressure barrel device and a gas input end. In addition, the micro-nano bubble generator 2 also includes a gas injector and a diffuser or a micro-nano bubble generator or other peripheral equipment.

Please refer to Figures 1, 2 and 3 again. For example, the micro-nano bubble distribution pipeline set 20 can optionally have a first regulating valve (i.e., regulating valve unit or regulating valve device) 2a, a second regulating valve 2b and a third regulating valve 2c, so that the first regulating valve 2a, the second regulating valve 2b or the third regulating valve 2c can be used to open or close, or to adjust a micro-nano bubble liquid flow rate or a micro-nano bubble liquid flow rate.

Please refer to Figures 1, 2 and 3 again. For example, the micro-nano bubble distribution pipeline set 20 connects the first cleaning tank 10a, the second cleaning tank 10b and the third cleaning tank 10c to the micro-nano bubble generator 2 via the first regulating valve 2a, the second regulating valve 2b and the third regulating valve 2c respectively, and the first regulating valve 2a, the second regulating valve 2b and the third regulating valve 2c can be used to control the micro-nano bubble flow rate, flow rate or both.

Please refer to Figures 1, 2 and 3 again. For example, a pump pumps water and air into the high-pressure barrel. The gas and water are fully mixed in the high-pressure barrel to produce a mixed liquid. The mixed liquid is pushed toward the micro-nano bubble generator 2 connected to the high-pressure barrel, and the micro-nano bubble generator 2 further impacts and crushes the mixed liquid to produce a large amount of finer bubble water.

Please refer to Figures 1, 2 and 3 again. For example, the first oily dirt floating unit 3a, the second oily dirt floating unit 3b and the third oily dirt floating unit 3c are selected from a floating solid-liquid separation device or a device with similar floating solid-liquid separation functions, and the first oily dirt floating unit 3a, the second oily dirt floating unit 3b and the third oily dirt floating unit 3c are connected and fixed to an appropriate position (e.g., the upper edge or other appropriate height position) of the first cleaning tank 10a, the second cleaning tank 10b and the third cleaning tank 10c by appropriate technical means (e.g., an integrated manner or a detachable manner).

FIG. 4 is a schematic flow chart of a multiple-type micro-nano bubble treatment method for heavily oil-contaminated soil of a preferred embodiment of the present invention, which corresponds to the multiple-type micro-nano bubble treatment system for heavily oil-contaminated soil of FIG. 1 and FIG. 2. Referring to FIG. 1, 2, 3 and 4, for example, the multiple-type micro-nano bubble treatment method for heavily oil-contaminated soil of a preferred embodiment of the present invention includes step S1: First, using the pollution analysis unit 1 to perform pollution concentration analysis from an oil-contaminated soil 8 or at least one oil-contaminated soil sample by appropriate technical means [for example: automatic method, semi-automatic method or manual method] to obtain a pollution concentration characteristic 80, for example: soil particle diameter and pollutant (oil pollution) concentration relationship characteristics or other relationship characteristics, and the oil-contaminated soil 8 is selectively arranged in the first cleaning tank 10a.

Please refer to Figures 1, 2, 3 and 4 again. For example, the pollution concentration characteristic 80 of the oil-contaminated soil 8 is selected from a pollution concentration characteristic curve, a pollution concentration characteristic model or a mathematical model with similar pollution concentration characteristics [mathematical module], and the pollution concentration characteristic 80 of the oil-contaminated soil 8 can be combined with other auxiliary processing units, such as: surfactant supply calculation unit, that is, calculating the relationship between oil pollutants and surfactants.

Please refer to Figures 1, 2, 3 and 4 again. For example, the pollution concentration characteristic 80 (e.g., high concentration oil pollution characteristic) of the oil-contaminated soil 8 (or oil-contaminated soil sample) includes a coarse particle oil content characteristic, a medium particle oil content characteristic and a fine particle oil content characteristic. In addition, the pollution concentration characteristic 80 of the oil-contaminated soil 8 (or oil-contaminated soil sample) is obtained by a soil particle sorting method and a soil particle oil content calculation.

Please refer to Figures 1, 2, 3 and 4 again. For example, the preferred embodiment of the present invention uses multiple micro-nano bubbles to treat heavily oil-contaminated soil, including step S2: Then, a first micro-nano bubble liquid is transported to an appropriate position (e.g., side bottom ring or other position) in the oil-contaminated soil 8 of the first cleaning tank 10a according to the pollution concentration characteristics 80 of the oil-contaminated soil 8 by appropriate technical means (e.g., automatic method, semi-automatic method or manual method) to maintain a first gas-solid ratio, and the first micro-nano bubble liquid appropriately generates a plurality of first micro-nano bubbles (or nano-level bubbles) in the oil-contaminated soil 8 to contact a plurality of oil-contaminated soil particles, and the first micro-nano bubble has an appropriate diameter (e.g., less than 1 μm).

Please refer to FIG. 3 again. For example, the first cleaning tank 10a, the second cleaning tank 10b or the third cleaning tank 10c further includes a stirring device [stirrer] 11, so as to fully stir and evenly treat the oil-contaminated soil 8 in the first cleaning tank 10a by appropriate technical means [for example, adjusting its rotation speed according to the characteristics of the pollution concentration], so as to improve the efficiency and uniformity of its micro-nano bubble treatment of heavily oil-contaminated soil.

For example, in theory, the growth pattern of microbubbles in water includes three consecutive stages. The first stage is the nucleation stage of microbubbles. When the pressure is released from the nozzle, the air is converted from the dissolved phase to the gas phase and a fixed number of bubble nuclei are formed. When all the dissolved air is converted to the gas phase, the first stage is completed. In the first stage, the pressure release is not instantaneous, but completed in a certain short time; however, it is generally assumed that the first stage is completed instantaneously. At the same time, the initial number of bubble nuclei in the first stage will determine the actual size of the bubbles in the solution. Therefore, in the presence of a limited excess of dissolved air, when there are more sites for bubble nucleation, a larger number of bubbles can be generated, and their particle size can be smaller.

Then, at the beginning of the second stage, the bubble core can grow steadily, and the total number of bubbles can maintain a certain number without coalescence. Then, during the third stage, the volume of the entire gas remains constant, but the bubbles gradually increase in diameter due to buoyancy and mutual combination, and the total number of bubbles will gradually decrease until the bubbles float to the surface of the liquid.

Figure 5 shows a schematic diagram of the relationship between the diameter of micro-nano bubbles and the internal air pressure in the multiple micro-nano bubble treatment system of the preferred embodiment of the present invention. Please refer to Figure 5. At a temperature of 25℃〔298K〕, when the bubble diameter is 1μm, the pressure inside the bubble can be as high as 4 times or more than the atmospheric pressure.

Please refer to Figure 5 again. For example, generally, the pressure inside the bubble and the bubble diameter must form an inverse proportion, as shown on the left side of Figure 5. Therefore, when the tiny bubble bursts, a high pressure point will eventually be generated to release energy and hydrogen free radicals.

Please refer to Figures 1, 2, 3 and 4 again. For example, the preferred embodiment of the present invention uses multiple micro-nano bubbles to treat heavily oil-contaminated soil, including step S3: Then, use appropriate technical means (such as automatic, semi-automatic or manual) to properly operate a plurality of the first micro-nano bubbles in the first cleaning tank 10a to cause them to break and generate a burst shock wave, a release of energy and a plurality of hydrogen radicals between a plurality of the oil-contaminated soil particles, so as to separate the plurality of the oil-contaminated soil particles to form a first deoiled soil 81 and a first separated oil-contaminated liquid.

FIG. 6 discloses a schematic diagram of a multiple-type micro-nano bubble treatment system for treating heavily oil-contaminated soil with micro-nano bubbles in a preferred embodiment of the present invention. Please refer to FIGS. 1, 2, 3, 5 and 6. For example, first, the micro-nano bubble generator 2 or bubble generator utilizes the bubble shrinking effect to obtain a plurality of micro-nano bubbles 21. The plurality of micro-nano bubbles 21 produce bubble bursts in the process of rising to the water surface to form a plurality of micro-nano bubble bursts 22. The bubble burst reaction instantly releases high-pressure shock waves, energy and hydrogen radicals, thereby separating and removing the attached contaminated oil products of a plurality of soil particles 8a.

Please refer to Figures 1, 2, 3, 5 and 6. For example, compared to ordinary bubbles, the size of the micro-nano bubble 21 tends to gradually decrease, and the bubble breaks due to its long residence time and the gas inside the bubble dissolving in water; in addition, there are strong hydrogen bonds similar to natural gas hydrates at the interface of the micro-nano bubble 21.

Please refer to FIG. 6 again. For example, since the hydrophobic oil has a better affinity with the surface of the micro-nano bubble 21, the micro-nano bubble 21 can continue to capture the oil while the micro-nano bubble 21 continues to float up. At the same time, it can also prevent the oil from reattaching to the soil particles 8a, thereby improving the efficiency of multiple micro-nano bubble treatment of heavily oil-contaminated soil.

Please refer to Figure 6 again. For example, during a first (first stage) oil removal treatment operation (i.e., a preliminary oil removal treatment operation, as shown on the left side of Figure 6), a number of oil-contaminated soil particles remain, and a number of the oil-contaminated soil particles are heavily or long-term oil-contaminated soil, and a number of the oil-contaminated soil particles need to further undergo another oil removal treatment operation (as shown on the right side of Figure 6) or other oil removal treatment operations.

Please refer to Figures 1, 2, 3 and 4 again. For example, the first separated oily liquid is subjected to a first oily floatation operation in the first cleaning tank 10a, and the first oily floatation unit 3a is used to perform the first oily floatation operation on the first separated oily liquid to obtain a floated oily liquid 90, as shown on the left side of Figure 3.

Please refer to Figures 1, 2, 3 and 4 again. For example, the multiple micro-nano bubble treatment method for heavily oil-contaminated soil of the preferred embodiment of the present invention includes step S4: Then, the first deoiled soil (i.e., initially deoiled soil) 81 is arranged in the second cleaning tank 10b by appropriate technical means (e.g., automated, semi-automated or manual), and a second micro-nano bubble liquid is transported into the first deoiled soil 81 in the second cleaning tank 10b to maintain a second gas-solid ratio, and the second micro-nano bubble liquid generates a plurality of second micro-nano bubbles in the first deoiled soil 81 to contact a plurality of oil-contaminated soil particles.

Please refer to Figures 1, 2, 3 and 4 again. For example, the preferred embodiment of the present invention uses multiple micro-nano bubbles to treat heavily oil-contaminated soil, including step S5: Then, use appropriate technical means (such as automatic, semi-automatic or manual) to appropriately operate a plurality of the second micro-nano bubbles in the second cleaning tank 10b to cause them to break between a plurality of the oil-contaminated soil particles, so as to separate the plurality of the oil-contaminated soil particles to form a second oil-removed soil and a second separated oil-contaminated liquid.

Please refer to Figures 1, 2, 3 and 4 again. For example, the second separated oily liquid is subjected to a second (second stage) oily floatation operation in the second cleaning tank 10b, and the second oily floatation unit 3b is used to perform the second oily floatation operation on the second separated oily liquid to obtain a floated oily liquid 90, as shown in the middle position of Figure 3.

Please refer to Figures 2 and 3 again. For example, the second deoiled soil is placed in the third cleaning tank 10c, and a third micro-nano bubble liquid is transported into the second deoiled soil in the third cleaning tank 10c to maintain a third gas-solid ratio, and the third micro-nano bubble liquid generates a plurality of third micro-nano bubbles in the second deoiled soil to contact a plurality of oil-contaminated soil particles; the third micro-nano bubbles are appropriately operated in the third cleaning tank 10c to break between a plurality of the oil-contaminated soil particles, so as to separate from the plurality of the oil-contaminated soil particles to form a third deoiled soil and a third separated oil-contaminated liquid.

Please refer to Figures 2 and 3 again. For example, the third separated oily liquid is appropriately subjected to a third (third stage) oily flotation operation in the third cleaning tank 10c, and the third oily flotation unit 3c is used to perform the third separated oily liquid with the third oily flotation operation to obtain a floated oily liquid 90, and the third cleaning tank 10c can be optionally connected to the clarification tank unit 10d to process a processed cleaning liquid, as shown on the right side of Figure 3.

FIG. 7 is a block diagram showing a multiple-type micro-nano bubble treatment system for heavily oil-contaminated soil according to the third preferred embodiment of the present invention, which corresponds to the multiple-type micro-nano bubble treatment system for heavily oil-contaminated soil in FIGS. 1 and 2 . Please refer to Figures 1, 2 and 7. Compared with the first and second embodiments, the first cleaning tank 10a of the third preferred embodiment of the present invention further includes a first heating device 4a or a device with a similar heating function, and the second cleaning tank 10b also includes a second heating device 4b or a device with a similar heating function, and the first heating device 4a and the second heating device 4b are respectively appropriately configured and assembled on the first cleaning tank 10a and the second cleaning tank 10b, so that the oil-contaminated soil 8 is heated at different temperatures in the first cleaning tank 10a and the second cleaning tank 10b according to the pollution concentration characteristics 80 at a predetermined temperature (for example: 25°C or other appropriate temperatures).

Please refer to Figures 1, 2 and 7 again. Another preferred embodiment of the present invention can be to add a surfactant 12 to the oil-contaminated soil 8 in the first cleaning tank 10a, the second cleaning tank 10b or the third cleaning tank 10c by appropriate technical means (e.g., automatic, semi-automatic or manual), and can choose to add different appropriate amounts of the surfactant 12 according to the pollution concentration characteristics 80 by appropriate technical means (e.g., pipeline transportation), and the surfactant 12 can be selected from a synthetic surfactant, a natural non-ionic surfactant or any combination thereof.

FIG8 discloses a schematic diagram of the relationship between oil removal rate and time under various micro-nano bubble pressures in a multiple micro-nano bubble treatment method for heavily oil-contaminated soil of a preferred embodiment of the present invention and its system. Please refer to FIGS. 1, 2, 3, 7 and 8. For example, the first micro-nano bubble liquid has a first bubble pressure, and the second micro-nano bubble liquid has a second bubble pressure, and the first bubble pressure and the second bubble pressure can be selected to be different.

Please refer to Figure 8 again. For example, the bubble pressure of the first micro-nano bubble liquid or the second micro-nano bubble liquid is selected from 3atm. (shown by the solid circle in Figure 8), 4atm. (shown by the solid triangle in Figure 8), 5atm. (shown by the solid square in Figure 8), or other bubble pressures, and the control group is a liquid without micro-nano bubbles (shown by the hollow circle in Figure 8).

FIG. 9 discloses a schematic diagram of the relationship between the oil removal rate and time of the multiple micro-nano bubble treatment method for heavily oil-contaminated soil and the system thereof using different micro-nano bubble liquid flow rates of the preferred embodiment of the present invention. Please refer to FIGS. 1, 2, 3, 7 and 9. For example, the first micro-nano bubble liquid has a first liquid flow rate [e.g., 0.5 L/min, as shown by the solid circle in FIG. 9], and the second micro-nano bubble liquid has a second liquid flow rate [e.g., 0.5 L/min, as shown by the solid triangle in FIG. 9], and the first liquid flow rate and the second liquid flow rate can be selected to be different.

FIG. 10 discloses a schematic diagram of the relationship between the oil removal rate and time of the multiple micro-nano bubble treatment method for heavily oil-contaminated soil and the system using different micro-nano bubble electrical properties of the preferred embodiment of the present invention. Please refer to FIGS. 1, 2, 3, 7 and 10. For example, the first micro-nano bubble liquid is a first charged bubble, and the second micro-nano bubble liquid has a second charged bubble, and the first charged bubble and the second charged bubble are selected from a positively charged bubble (as shown by the solid circle in FIG. 10) or a negatively charged bubble (as shown by the solid triangle in FIG. 10).

The above experimental data are preliminary experimental results obtained under specific conditions, which are only used to facilitate understanding or reference of the technical content of the present invention. Other related experiments are still required. The experimental data and its results are not used to limit the scope of rights of the present invention.

The above preferred embodiments are only examples to illustrate the present invention and its technical features. The technology of the embodiments can still be appropriately implemented in various substantially equivalent modifications and/or replacement methods; therefore, the scope of rights of the present invention shall be subject to the scope defined by the attached patent application scope. The copyright of this case is limited to the use of patent applications in the Republic of China.

1: Pollution analysis unit

10a: First cleaning tank

10b: Second cleaning tank

2: Micro-nano bubble generator

20: Micro-nano bubble distribution pipeline set

3a: The first oil pollution flotation unit

3b: Second oil pollution flotation unit

8: Oil contaminated soil

80: Pollution concentration characteristics

81: First, the oily soil has been removed

90: The oil has been removed.

Claims (10)

A multi-mode micro-nano bubble treatment system for heavily oil-contaminated soil, comprising: A first cleaning tank, which is used to accommodate oil-contaminated soil, and the first cleaning tank is used to perform a first oil removal treatment operation on the oil-contaminated soil; 1. Pollution concentration characteristics obtained by conducting pollution concentration analysis on the oil-contaminated soil; A second cleaning tank, which is used to perform a second oil removal treatment operation on the oil-contaminated soil; At least one micro-nano bubble generator, which transports a first micro-nano bubble liquid into the oil-contaminated soil in the first cleaning tank according to the pollution concentration characteristics, and transports a second micro-nano bubble liquid into the second cleaning tank by the micro-nano bubble generator; and At least one micro-nano bubble distribution pipeline set, which respectively connects the first cleaning tank and the second cleaning tank to the micro-nano bubble generator; The first micro-nano bubble liquid generates a plurality of first micro-nano bubbles in the oil-contaminated soil and contacts a plurality of oil-contaminated soil particles, and the plurality of first micro-nano bubbles are generated and ruptured between a plurality of the oil-contaminated soil particles, so as to separate from the plurality of the oil-contaminated soil particles to form a first oil-removed soil and a first separated oil-contaminated liquid; and The first de-oiled soil is placed in a second cleaning tank, and a second micro-nano bubble liquid is transported into the first de-oiled soil in the second cleaning tank, and the second micro-nano bubble liquid generates a plurality of second micro-nano bubbles in the first de-oiled soil to contact a plurality of oil-contaminated soil particles, and a plurality of the second micro-nano bubbles are broken between a plurality of the oil-contaminated soil particles, so as to separate from the plurality of the oil-contaminated soil particles to form a second de-oiled soil and a second separated oil-contaminated liquid. According to the multiple micro-nano bubble treatment system for heavily oil-contaminated soil described in Item 1 of the patent application, the first micro-nano bubble liquid has a first bubble pressure, and the second micro-nano bubble liquid has a second bubble pressure, and the first bubble pressure is different from the second bubble pressure. According to the multi-mode micro-nano bubble treatment system for heavily oil-contaminated soil described in Item 1 of the patent application, the first micro-nano bubble liquid has a first liquid flow rate, and the second micro-nano bubble liquid has a second liquid flow rate, and the first liquid flow rate is different from the second liquid flow rate. According to the multiple micro-nano bubble treatment system for heavily oil-contaminated soil described in Item 1 of the patent application, the first micro-nano bubble liquid is a first charged bubble, and the second micro-nano bubble liquid has a second charged bubble, and the first charged bubble and the second charged bubble are selected from a positively charged bubble or a negatively charged bubble. According to the multi-type micro-nano bubble treatment system for heavily oil-contaminated soil described in Item 1 of the patent application scope, the micro-nano bubble distribution pipeline set has at least one regulating valve unit. A multi-step method for treating heavily oil-contaminated soil using micro-nano bubbles, comprising: Conducting pollution concentration analysis on oil-contaminated soil to obtain a pollution concentration characteristic, and placing the oil-contaminated soil in a first cleaning tank; According to the pollution concentration characteristics, a first micro-nano bubble liquid is transported into the oil-contaminated soil in the first cleaning tank, and the first micro-nano bubble liquid generates a plurality of first micro-nano bubbles in the oil-contaminated soil to contact a plurality of oil-contaminated soil particles; A plurality of the first micro-nano bubbles are generated and burst between a plurality of the oil-contaminated soil particles, so as to separate from the plurality of the oil-contaminated soil particles to form a first oil-removed soil and a first separated oil-contaminated liquid; The first deoiled soil is placed in a second cleaning tank, and a second micro-nano bubble liquid is transported into the first deoiled soil in the second cleaning tank, and the second micro-nano bubble liquid generates a plurality of second micro-nano bubbles in the first deoiled soil to contact a plurality of oil-contaminated soil particles; and A plurality of the second micro-nano bubbles are generated and burst between a plurality of the oil-contaminated soil particles, so as to separate from the plurality of the oil-contaminated soil particles to form a second oil-removed soil and a second separated oil-contaminated liquid. According to the multi-mode method of treating heavily oil-contaminated soil with micro-nano bubbles as described in Item 6 of the patent application scope, the pollution concentration characteristics include a coarse particle oil content characteristic, a medium particle oil content characteristic and a fine particle oil content characteristic. According to the multi-stage method of treating heavily oil-contaminated soil with micro-nano bubbles as described in Item 6 of the patent application scope, the pollution concentration characteristics are obtained by a soil particle sorting method and a soil particle oil content calculation. According to the multi-stage method of treating heavily oil-contaminated soil with micro-nano bubbles as described in Item 6 of the patent application scope, the first micro-nano bubble liquid or the second micro-nano bubble liquid is produced by a micro-nano bubble generator. According to the multi-step method of treating heavily oil-contaminated soil with micro-nano bubbles as described in Item 6 of the patent application scope, a surfactant is added to the oil-contaminated soil.

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