JP2010125361A - Wastewater treatment system and purification system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wastewater treatment system which has high purification capability, is simple, and enables space saving. <P>SOLUTION: The wastewater treatment system mainly comprises: an anaerobic tank 30; an aerobic tank 40; a multifunctional treatment apparatus 50 including a flotation tank 54, a contact aeration tank 60, a biofiltration tank 66, and a floating substance storage/decomposition tank 58; and a filtration/discharge tank 80. The anaerobic tank 30, the aerobic tank 40, the biofiltration tank 66, and a filtration tank body 84 are provided with a rare earth mineral filter material 32, 46A, 46B, 70, 88, and the contact aeration tank 60 is provided with a shaking bed 62. Using the rare earth mineral filter material enables high-performance purification treatment of livestock wastewater or the like and reduction of a treatment time although the wastewater treatment system is simple and space-saving. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wastewater treatment system and a purification system, and more specifically to a wastewater treatment system and a purification system suitable for purifying livestock wastewater, contaminated soil, contaminated groundwater, and the like.

Examples of processing equipment for livestock wastewater include, for example, a denitrification tank to which liquid livestock excrement is supplied undiluted, a nitrification tank to which the liquid in the denitrification tank is supplied, and a liquid in the nitrification tank to the denitrification tank And a filter that allows the liquid component to pass through without passing the activated sludge in the liquid in the nitrification tank is provided in a state of being immersed in the liquid in the nitrification tank. There is a livestock excrement purification apparatus provided with suction means for sucking and discharging the liquid in the nitrification tank to the outside (Patent Document 1).
JP-A-11-5779

As a method for purifying contaminated soil and groundwater contaminated with harmful substances, for example, Patent Document 2 below discloses a method for purifying soil and groundwater contamination. According to this technology, at least one nutrient source injection well is provided on the upstream side of groundwater, and in the original position where harmful pollutants flow into the ground, drain material is installed vertically to the aquifer where groundwater flows. By driving, the drain material allows permeation of groundwater and the eluted nutrient source into the upper silt layer, and the microorganisms are distributed almost evenly to proliferate and activate to purify harmful pollutants.
JP 2006-110404 A

  However, considering the reuse of drained water and groundwater after purification, further improvement in purification capacity is essential, and it is still advantageous if simple and space saving can be realized.

  The present invention focuses on the above points, and an object of the present invention is to provide a wastewater treatment system and a purification system that have a high purification capacity, are simple, and can save space.

  In order to achieve the above object, the wastewater treatment system of the present invention comprises an anaerobic tank for performing anaerobic treatment of wastewater, and an aeration means, and an aerobic tank for performing aerobic treatment of wastewater that has passed through the anaerobic tank, A flotation separation tank that includes fine bubble generation means and separates levitated material from waste water that has passed through the aerobic tank, and aeration of waste water from which the fine bubble generation means and the swing bed are installed and the levitated substance is separated A contact aeration tank for processing, a biofiltration tank for filtering the waste water after the aeration process, which is equipped with a filter device made of fine bubble generating means and rare earth minerals, and a levitated substance separated in the flotation separation tank are stored. A multi-functional treatment apparatus including a levitated substance storage / decomposition tank that decomposes and a filter medium made of fine bubbles and a filter medium made of rare earth minerals, and further filtering waste water that has passed through the biological filtration tank; , Treated wastewater that passed through the filtration tank Filtration and discharge tank comprising a discharge tank capable discharged to the outside together with the storing, and further comprising a.

  One of the main forms is characterized in that at least one of the anaerobic tank and the aerobic tank includes a filter medium made of a rare earth mineral. In another embodiment, the waste water is livestock waste water.

  The purification system of the present invention is a purification system that is installed within a certain range surrounded by a shielding wall that reaches a water-impervious layer under the contaminated soil and has a water-blocking effect, and is above the water-impermeable layer. A relay tank having a pump for pumping contaminated groundwater from a groundwater area and a pump for pumping the pumped contaminated groundwater to the outside, equipped with means for generating fine bubbles, and floating objects from the contaminated groundwater sent from the relay tank A flotation separation tank to be separated, a contact aeration tank in which fine bubble generation means and a rocking bed are installed to perform aeration treatment of contaminated groundwater from which the floating substance has been separated, a filter medium comprising fine bubble generation means and a rare earth mineral And a biological filtration tank for filtering contaminated groundwater after aeration treatment, and a levitated substance storage / decomposition tank for storing and decomposing levitated matter separated in the levitating separation tank. A filter medium comprising a device, a fine bubble generating means and a rare earth mineral filter, further filtering contaminated groundwater that has passed through the biological filtration tank, and groundwater after treatment that has passed through the filter tank as the groundwater area. Returning means for returning to the upper unmodified soil layer is provided. The above and other objects and advantages of the present invention will be apparent from the following detailed description and the accompanying drawings.

  The present invention provides (1) drainage before a multi-functional treatment apparatus comprising a flotation separation tank, a contact aeration tank provided with a rocking bed, and a biological filtration tank using rare earth (rare earth) mineral as a filter medium. An anaerobic tank and an aerobic tank that perform anaerobic and aerobic treatment of (2) will be installed, or (2) a relay tank will be installed to store the pumped contaminated groundwater. In both cases (1) and (2), a filtration tank using the rare earth mineral as a filter medium is provided after the multifunctional processing apparatus. For this reason, while being simple and space-saving, the effect that the high-performance process of waste_water | drain and contaminated groundwater (and contaminated soil) is attained is acquired.

  Hereinafter, the best mode for carrying out the present invention will be described in detail based on examples.

  First, Embodiment 1 of the present invention will be described with reference to FIGS. In this embodiment, the present invention is applied to a wastewater treatment system for the purpose of “denitrification” of livestock (mainly pig farm) wastewater. 1A is a diagram showing the flow of purification processing according to this embodiment, FIG. 1B is a plan view showing the overall configuration of the system of this embodiment, and FIG. 1C is a cross-sectional view of FIG. It is. FIG. 2 is a diagram showing a floating separation tank and a floating substance storage / decomposition tank of the multi-function processing apparatus constituting this embodiment, (A) is a plan view, and (B) is the above (A) in the direction of arrow F2. (C) is a view showing the floating object advection tube. The purification system of the present embodiment is mainly composed of an anaerobic tank 30, an aerobic tank 40, a multi-function processing device 50, and a filtration / release tank 80. In addition to this, an existing processing water tank 10, a measuring tank 20, a blower 110, a control panel 120, and an ozone treatment tank 100 as necessary.

  The existing treated water tank 10 includes a water pump 12 inside, and wastewater is sent to the measuring tank 20 by a pumping pipe 14 connected to the water pump 12. The measuring tank 20 is provided with a return pipe 16 for returning the wastewater to the existing treated water tank 10 and an anaerobic tank inflow pipe 22 for sending the measured wastewater to the anaerobic tank 30.

  The anaerobic tank 30 performs anaerobic treatment of the wastewater sent from the measuring tank 20, and in this embodiment, a rare earth mineral filter material (rare earth mineral filter) made of a rare earth mineral at the bottom of the tank. Material) 32 is installed. Rare earth minerals include lanthanum [La], cerium [Ce], praseodymium [Pr], neodymium [Nd], promethium [Pm], samarium [Sm], europium [Eu], gadolinium [Gd], terbium [Tb], One of the element groups (lanthanoids) of dysprodium [Dy], holmium [Ho], erbium [Er], thulium [Tm], terbium [Yb], methetium [Lu], scandium [Sc], and yttrium [Y] include. Such rare earth minerals are known to function as far-infrared emitters, and porous ores absorb odorous gases and adsorb and occlude bacteria (microorganisms). There is also. In this embodiment, the rare earth mineral is also introduced into the anaerobic tank 30 to take advantage of its characteristics and power, thereby causing a phenomenon that cannot be considered with conventional filter media.

Specifically, it has the following functions.
(1) Strong adsorptive power: The ore has an adsorbing action that is superporous and has a very large surface area, and the main components are silicic anhydride and aluminum oxide. Remove harmful heavy metals such as lead and cadmium.
(2) Elution of minerals: When these ores are put into water, free chlorine, pollutants, organic substances, bacteria, etc. in the water are adsorbed and removed.
(3) pH buffering ability: Both acidic water and alkaline water are close to neutrality.

In the present embodiment, in addition to the anaerobic tank 30, the rare earth mineral filter material is also used in an aerobic tank 40, a multi-functional treatment device 50, and a filtration / release tank 80 described later. Table 1 below shows an example of the types and component compositions of rare earth minerals that can be used in various parts of this example.

  Next, the aerobic tank 40 will be described. The aerobic tank 40 is subjected to the aerobic treatment by the waste water that has been subjected to the anaerobic process performed by the anaerobic tank 30 through the aerobic tank inflow pipe 34. The aerobic tank 40 includes a diffuser pipe 42 at the bottom, and a two-stage filter media installation base 44A, 44B is provided above the aeration tube 42, and rare earth mineral filter media 46A, 46B are installed thereon. . The materials and functions of the rare earth mineral filter media 46A and 46B are the same as those of the rare earth mineral filter media 32. The waste water treated in the aerobic tank 40 is sent to the multi-function treatment device 50 through the treatment device inflow pipe 48.

  The multi-function processing apparatus 50 has a plurality of processing functions, and is divided into a floating separation tank 54, a contact aeration tank 60, a biological filtration tank 66, and a floating substance storage / decomposition tank 58 by partition plates 52A to 52C. It is delimited. The levitation separation tank 54 includes a microbubble generator 56 and separates levitation from the wastewater that has passed through the aerobic tank 40. The movement of the separated levitated objects uses natural flow movement due to water level fluctuations. This will be described later. The fine bubble generating device 56 is a non-filter multipurpose simple floating foam separating device having a known fine bubble generating mechanism (for example, “Tech Former” (registered trademark) (a fine bubble generating device manufactured by Tech Industrial Co., Ltd.). ) Etc. are available.

The fine bubble generator 56 has the following advantages.
(1) Micron bubbles: Micron bubbles having a bubble diameter mode of 1 mm or less are generated. Excellent lateral diffusivity, and micron bubbles diffuse throughout the tank. Thereby, effects such as aeration, levitation separation, and foam separation are enhanced.
(2) Portable: Small and lightweight, easy to carry.
(3) Set-free: Since it can be directly submerged in a treatment tank or treatment area, it can be installed at any time according to the place of use. If there is a power source, no special equipment for installation is required.
(4) Maintenance-free: Newly developed special impeller generates micron bubbles by mechanical shearing, so there is no clogging during use.
(5) Power saving: Low power consumption (100V · 100W to 200V · 750W). There is no need for special power supply.

  The wastewater from which the levitated matter is separated in the levitating separation tank 54 is sent to the contact aeration tank 60 by the intermediate water advection pipe 54A, and the levitated substance separated from the wastewater is levitated substance storage / decomposition tank by the levitated substance advection pipe 54B. 58. As shown in FIG. 2, the floating substance storage / decomposition tank 58 is provided with a swing bed 59A and a fine bubble diffuser 59B, and the decomposed floating substance is a pipe 58A for returning treated water. To the existing treated water tank 10.

  In the multi-function processing apparatus 50 of the present embodiment, a method is adopted in which the levitated matter separated in the levitating separation tank 54 is transferred to the levitated substance storage / decomposition tank 58 without using a recovery tool. Specifically, as shown in FIG. 2 (B), the levitated substance storage / decomposition tank is positioned 50 to 70 mm higher than the water level of the intermediate water advection pipe 54A from the levitating separation tank 54 to the contact aeration tank 60. An opening 55A of the floating material advection pipe 54B is provided so that the elbow 55B of the advection port can be rotated left and right without being bonded and fixed (see FIG. 2C). Then, a single pipe 55C having a length of 200 to 300 mm is connected to the elbow 55B to balance with the water level of the intermediate water advection pipe 54A of the floating separation tank 54, and only the floating substance is transferred to the floating substance storage / decomposition tank 58. Adjust to advection. Thereby, the water level of the pipe 58A for returning the treated water in the levitated substance storage / decomposition tank 58 can be set regardless of the drop from the previous tank.

  On the other hand, in the illustrated example, the contact aeration tank 60 is divided into two blocks by a partition whose bottom communicates with each other, and each of them has a rocking bed (rocking filter bed) 62 and a fine bubble diffuser (fine bubble generator). 64). By passing through the contact aeration tank 60, the waste water is subjected to an aeration process. The rocking floor 62 is an epoch-making contact material that maximizes the necessary functions by taking advantage of the characteristics of the fiber filter material, such as “Bio Fringe” (manufactured by NT Corporation). The microbial layer retainability on the surface is high, and the excessive adhesion is continuously peeled off from the surface by the rocking effect of the circulating water flow.

This completely eliminates the drawbacks of blockage and simultaneous detachment of conventional contact materials. Since the microbial layer is stably held on the surface, a food chain is formed, and sludge generation is reduced by improving sludge settling and increasing MLSS, and a treatment flow without sludge treatment is also possible. At the same time, there is a denitrification effect and the cost performance is the best. Specifically, there are the following advantages.
(1) The processing capacity is 2 to 5 times (space saving and expansion unnecessary).
(2) Sludge generation amount is 1/5 to 1/10 (no sludge treatment).
(3) Aggregation pretreatment is not required even if the oil content and SS are high (SRT increasing effect).
(4) Cost reduction through long-term (over 15 years) stable use and maintenance-free effect.
(5) Low concentration (short-time treatment: several minutes) and high concentration (10,000 mg · l) are no problem.

  The waste water aerated in the contact aeration tank 60 is sent to the biological filtration tank 66 through a pipe 60A. The biological filtration tank 66 is divided into three blocks by a partition that communicates at the bottom. Each biological filtration tank 66 is provided with a fine bubble diffuser (fine bubble generation device) 72 at the bottom, and is installed on a filter material installation stand 68 above. The rare earth mineral filter material 70 is provided. The material and function of the rare earth mineral filter medium 70 are as described above.

  The wastewater filtered through the biological filtration tank 66 is sent to the filtration / discharge tank 80 by the filtration tank inflow pipe 74. The filtration / discharge tank 80 is divided into a filter tank main body 84 and a discharge tank 94 by a partition plate 82. The filtration tank body 84 is divided into two blocks by a partition where the bottoms are connected to each other. A fine bubble diffuser 90 is provided at each bottom, and a rare earth mineral filter material 88 supported by a filter material installation stand 86 is provided above the fine bubble diffuser 90. The wastewater treated in the biological filtration tank 66 of the multi-function treatment device 50 is further filtered. Then, the wastewater filtered by the filtration tank main body 84 is sent to the adjacent discharge tank 94 by the pipe 92.

  A fine bubble diffuser 96 is provided at the bottom of the discharge tank 94, and a pipe 98 for discharging treated wastewater to the outside is provided above. The pipe 98 is branched to a discharge pipe 98A and a diluted water return pipe 98B outside the filtration / discharge tank 80. The diluted water return pipe 98B merges with the pipe 58A of the levitated material storage / decomposition tank 58 of the multi-function processing device 50, dilutes the decomposed material flowing through the pipe 58A, and sends it back to the existing treated water tank 10. On the other hand, the water discharged by the discharge pipe 98A can be recycled for washing water or watering. Alternatively, the discharge pipe 98B may be connected to the ozone treatment tank 100 as necessary, and discharged after being subjected to ozone treatment.

  In addition, in the purification system of the present embodiment, a blower 110 and a control panel 120 are provided. The blower 110 is connected to the diffuser pipe 42 and the fine bubble diffusers 64, 72, 90, and 96, and is also connected to the control panel 120 to control its operation. In addition to the blower 110, the control panel 120 is connected to the water supply pump 12 and the fine bubble generating device 56, and controls their operations.

  <Experimental Example> An experimental example using the purification system of this example will be described. Processing is performed under the following conditions, and raw water, treated water in the anaerobic tank 30, aerobic tank 40, flotation separation tank 54, contact aeration tank 60, and biological filtration tank 66 are collected, and the hydrogen ion concentration and suspended solids are collected. The amount, chemical oxygen demand, biological oxygen demand, normal hexane extract content, nitrogen content and phosphorus content were analyzed.

(1) Raw water: Treated water from the treatment tank in the wastewater treatment facility (originally discharged water) was used.
(2) Anaerobic tank: The bottom of the anaerobic tank 30 was filled with about 8% (volume) of rare earth (rare earth) mineral with respect to 80 l of the liquid to be treated. Let stand for 22 hours and 30 minutes.
(3) Aerobic tank: Aerobic tank 40 was aerated by hanging 1 kg / rare earth (rare earth) mineral as a contact material. Continuous aeration for 22 hours and 30 minutes.
(4) Levitation separation tank: The magnetic disk of the aerobic tank 40 was removed, and a tech former (fine bubble generator) was set and started. Although a flocculant was added as a test, the amount of bubbles generated by the tech former was large with respect to the amount of test water, resulting in extreme stirring and no results were obtained. Ends in 30 minutes (measured values are treated as reference values).
(5) Contact aeration tank: treatment with biofringe. “KF bacteria” (enzyme microbial preparation or microorganism / enzyme preparation) and activity promoter “Eco-Crystal” (manufactured by Chogiken) were added in small amounts.
(6) Biological filtration tank: As a filtering material, 80% rare earth (rare earth) mineral and 20% biofringe mass were used. The entrance and exit of the tank were circulated with a small pump. Continuous operation for 22 hours and 30 minutes.

As the “KF bacterium”, for example, the following one disclosed in Japanese Patent No. 2581521 is used.
Bacteria 1 × 10 ⁹ CFU / g
Breakdown 5 × 10 ⁸ CFU / g Gram-positive ant fungus
3 × 10 ⁸ CFU / g Gram-negative gonococci
2 × 10 ⁸ CFU / g Gram-positive cocci
4 × 10 ⁷ CFU / g Spore yeast 5 × 10 ⁷ CFU / g
Filamentous fungus 9 × 10 ⁴ CFU / g

Table 2 below shows the analysis results together with the discharge regulation values. From this result, when passing through the biological filtration tank 66, it was confirmed that all the analysis items were below the discharge regulation value.

  As described above, according to the first embodiment, the multi-function processing apparatus 50 including the floating separation tank 54, the contact aeration tank 60 provided with the rocking bed 62, and the biological filtration tank 66 provided with the rare earth mineral filter material 70. Before, the anaerobic tank 30 and the aerobic tank 40 were provided, and the filtration / release tank 80 provided with the rare earth mineral filter material 88 was provided after the multifunctional processing apparatus 50. For this reason, the effect that the high performance processing of livestock wastewater becomes possible is acquired, being simple and space-saving. Further, the cost can be reduced by shortening the processing time.

  Next, Embodiment 2 of the present invention will be described with reference to FIG. In addition, the same code | symbol shall be used for the component which is the same as that of the Example mentioned above or respond | corresponds. FIG. 3 (A) is a diagram showing the flow of purification processing according to this embodiment, FIG. 3 (B) is a plan view showing the overall configuration of the system of this embodiment, and FIG. 3 (C) is a sectional view of (B). It is. The present embodiment is an example in which the purification system of the present invention is applied to the purification of contaminated soil and contaminated groundwater, and the contaminants are purified and removed by this system and general soil bacteria. The purification system of the present embodiment is installed in a range surrounded by a shielding wall 208 having a water shielding effect reaching the impermeable layer 200 below the unimproved soil layer (contaminated soil layer). , The multi-function processing device 50 and the filtration tank 240, and in addition, a suction well 210, a measuring tank 230, a return well 260, a bio tank 270, a blower 280, a control panel 290, and the like are included. Further, on the impermeable layer 200, layers are formed in the order of a groundwater area 202, an unimproved soil layer 204, and an improved soil 206.

  The suction well 210 passes through the improved soil 206 and the unimproved soil layer 204, and the tip of the suction pipe 212 disposed inside thereof reaches the groundwater area 202. The relay tank 220 is connected to the suction pipe 212 and includes a pumping pump 222 for pumping contaminated groundwater from the groundwater area 202, and a water pump 224 for sending the pumped contaminated groundwater to the measuring tank 230 through the water pipe 226. . The measuring tank 230 is provided with a return pipe 232 for returning contaminated groundwater to the relay tank 220 and a processing apparatus inflow pipe 234 for sending the measured contaminated groundwater to the multi-function processing tank 50.

The multi-function processing device 50 has the same configuration as that of the first embodiment described above. That is,
(1) A floating separation tank 54 that includes a fine bubble generator 56 and floats and separates fine impurities from the groundwater sent from the measuring tank 230;
(2) A contact aeration tank 60 in which a fine bubble diffuser 64 and an oscillating floor 62 are installed, and performs aeration treatment of contaminated groundwater from which the floating matter is separated,
(3) A biological filtration tank 66 in which a fine bubble diffuser 72 and a rare earth mineral filter medium 70 are installed, and which filters contaminated groundwater after aeration treatment,
(4) a levitated substance storage / decomposition tank 58 for storing and decomposing levitated matter separated in the levitating separation tank 54;
It is the composition which includes. In such a multi-function processing apparatus 50, a decomposition process of VOC (volatile organic compound) is also performed. The contaminated groundwater that has passed through the biological filtration layer 66 is sent to the filtration tank 240 by the filtration tank inflow pipe 74, and the levitated matter decomposed by the levitated substance storage / separation layer 58 is discharged from the pipe 58A. .

  The filtration tank 240 is divided into three filtration chambers 244, 246, and 248 by a partition plate 242A and 242B, and each filtration chamber is divided into two blocks by a partition plate 242C having a bottom part connected thereto. It has been. At the bottom of each block of the filtration chambers 244, 246, 248, a fine bubble diffuser 254 and a rare earth mineral filter medium 250 supported by a filter medium installation base 252 are provided above. The filtration chambers 244 and 246 are connected by a pipe 244A, and the filtration chambers 246 and 248 are connected by a pipe 246A. Therefore, the contaminated groundwater treated in the biological filtration tank 66 of the multi-function treatment apparatus 50 is further filtered, adsorbed, decomposed, and ionized while passing through the filtration chambers 244 → 246 → 248, and sent to the return pipe 256. It is done. In addition, the material and function of the rare earth mineral filter used in the multi-function processing device 50 and the filter tank 240 are the same as those in the first embodiment.

  The return pipe 256 is disposed inside a return well 260 that penetrates the improved soil 206, and the tip thereof reaches the unmodified soil layer 204. For this reason, the treated groundwater that has passed through the filtration tank 240 is returned to the unimproved soil layer 204 via the return pipe 256. Circulating treated water through the unmodified soil layer 204 activates soil bacteria and promotes decomposition of harmful substances. The return pipe 256 is provided with a treated water collection valve 258, which is used when collecting treated water for water quality inspection or the like.

In addition, in the purification system of the present embodiment, a bio tank 270, a blower 280, and a control panel 290 are provided. The bio-tank 270 is provided as necessary, and includes a metering pump 272 and a pipe 274, and is supplied to the floating separation tank 54 of the multi-function processing device 50 via the pipe 274. The above-mentioned KF bacteria etc. are added. The enzyme microbial bioagent is a degrading bacterium obtained by a special culturing technique based on “stable many principles” (enrichment culture), and has a general bacterial count of 1.9 × 10 ¹⁰ , Works corresponding to the conditions. By combining with the swing bed 62 and the fine bubble generating device 56, processing in a short time (1/5 of the normal processing time) becomes possible. It not only removes BOD, but also exerts its power as a denitrifying fixed bacterium (the enzyme microbial activator exhibits a strong decomposing ability due to highly dissolved oxygen supplied by the microbubble generator 56). Due to the action of the enzyme microbial herbicide, the treated water has the advantage of eliminating odor and sludge.

  The blower 280 is connected to the fine bubble diffusers 64, 72, and 254 by wiring (not shown), and is connected to the control panel 290 to control its operation. In addition to the blower 280, the control panel 290 is connected to a pumping pump 222, a water pump 224, a fine bubble generator 56, and the like, and controls their operations.

  Thus, according to the purification system of the present embodiment, by combining the rare earth mineral filter medium used in the purification system and the action of general soil bacteria in the unmodified soil layer 204 to which treated groundwater is returned, efficiency is improved. Well, it can purify and remove soil and groundwater contaminants (VOC and heavy metals). In addition, since processing can be performed in a short time, costs can be reduced. Furthermore, by using an enzyme microbial herbicide together as necessary, it is possible to significantly shorten the treatment time and eliminate odor and sludge from the treated water.

<Experimental Example 1> Next, Experimental Example 1 of this example will be described. Enzyme microbial herbicide was added from the bio tank 270 to the multi-function processing apparatus 50 using rare earth mineral filter media, and aeration was continuously performed for 48 hours to test the removal state of contaminants. The test sample was prepared by dissolving 1,000 g of contaminated soil collected in Chiba Prefecture in 2 liters of tap water. The test results are shown in Table 3 below. From the results of Table 3, it was confirmed that the treated water was below the soil elution amount standard in all the measurement items.

  <Experimental example 2> ... Assuming benzene-containing soil, benzene was emulsified and mixed in the soil used in Experimental example 1. It was dissolved in 550 g of contaminated sludge with 220 cc of emulsified benzene and 1,000 cc of tap water, passed through a fine sieve, and used as a sample solution. In the treatment test, 30 l of bio solution for soil and 100 g of enzyme microbial herbicide were added and aerated continuously for 48 hours. As a result, it was confirmed that the untreated sample solution had a benzene content of 1,590 mg / l, whereas the treated solution was less than 0.01 mg / l of the soil elution amount standard.

In addition, this invention is not limited to the Example mentioned above, A various change can be added in the range which does not deviate from the summary of this invention. For example, the following are also included.
(1) The apparatus configuration shown in the above embodiment is an example, and may be appropriately changed as necessary. For example, a plurality of multi-function treatment devices 50 may be connected according to the amount of treated water. Moreover, in the said Example 1, although the filtration and the discharge tank 80 was made into the integral type, you may prepare a filtration tank and a discharge tank independently.
(2) The addition of the enzyme microbial herbicide shown in Example 2 is an example, and it may be added as necessary. Also in the first embodiment, the enzyme microorganism herbicide may be added to the multi-function processing apparatus 50 as necessary.
(3) In the first embodiment, the present invention is applied to the treatment of livestock wastewater. However, this is also an example, and the present invention can be applied to various wastewaters such as kitchen wastewater, disaster-time wastewater, and factory wastewater.

  According to the present invention, before the multi-functional treatment apparatus including the floating separation tank, the contact aeration tank provided with the swinging bed, and the biological filtration tank using rare earth (rare earth) mineral as a filter medium, (1 ) Install anaerobic tank and aerobic tank for anaerobic and aerobic treatment of drainage, or (2) install a relay tank to store the pumped contaminated groundwater. In both cases (1) and (2), a filtration tank using the rare earth mineral as a filter material is provided after the multi-function treatment apparatus, and therefore, it can be applied to the use of a purification system. In particular, it is suitable as a system for purifying livestock wastewater and purifying contaminated soil and contaminated groundwater.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Example 1 of this invention, (A) is a figure which shows the flow of the purification process by a present Example, (B) is a top view which shows the whole structure of the system of a present Example, (C) is the said It is sectional drawing of (B). It is a figure which shows the floating separation tank and floating matter storage / decomposition tank of the multifunction processing apparatus which comprise the system of this invention, (A) is a top view, (B) looked at said (A) from the arrow F2 direction. Side view, (C) shows the floating object advection tube. It is a figure which shows Example 2 of this invention, (A) is a figure which shows the flow of the purification process by a present Example, (B) is a top view which shows the whole structure of the system of a present Example, (C) is the said figure It is sectional drawing of (B).

Explanation of symbols

10: Existing treatment water tank 12: Water pump 14: Pumping pipe 16: Return pipe 20: Metering tank 22: Anaerobic tank inflow pipe 30: Anaerobic tank 32: Rare earth (rare earth) mineral filter material 34: Aerobic tank inflow pipe 40: Good Air tank 42: Diffuser pipes 44A, 44B: Filter medium installation base 46A, 46B: Rare earth (rare earth) mineral filter medium 48: Treatment apparatus inflow pipe 50: Multi-function treatment apparatus 52A-52C: Partition plate 54: Floating separation tank 54A: Intermediate water advection pipe 54B: Floating matter advection pipe 55A: Opening 55B: Elbow 55C: Single pipe 56: Fine bubble generator 58: Floating matter storage / decomposition tank 58A: Pipe 59A: Oscillating bed 59B: Fine bubble diffuser 60: Contact Aeration tank 60A: Pipe 62: Rocking bed 64, 72: Fine bubble diffuser 66: Biological filtration tank 68: Filtration Installation base 70: Rare earth (rare earth) mineral filter material 74: Filtration tank inflow pipe 80: Filtration / discharge tank 82: Partition plate 84: Filtration tank body 86: Filter medium installation base 88: Rare earth (rare earth) mineral filter medium 90, 96 : Fine bubble diffuser 92: Pipe 94: Discharge tank 98: Pipe 98A: Discharge pipe 98B: Diluted water return pipe 100: Ozone treatment tank 110: Blower 120: Control panel 200: Impermeable layer 202: Groundwater area 204: Unmodified soil Layer 206: Improved soil 208: Shielding wall 210: Suction well 212: Suction pipe 220: Relay tank 222: Water pump 224: Water pump 226: Water pipe 230: Metering tank 232: Return pipe 234: Treatment device inflow pipe 240: Filtration Tanks 242A-242C: Partition plates 244, 246, 248: Filtration chambers 244A, 24 A: Pipe 250: Rare earth (rare earth) mineral filter medium 252: Filter medium installation base 254: Fine bubble diffuser 256: Return pipe 258: Treated water collection valve 260: Return well 270: Bio tank 272: Metering pump 274: Pipe 280: Blower 290: Control panel

Claims (4)

Anaerobic tank for anaerobic treatment of waste water,
An aerobic tank having an aeration means for performing an aerobic treatment of the waste water that has passed through the anaerobic tank;
A flotation separation tank that includes fine bubble generation means and separates levitated material from waste water that has passed through the aerobic tank, and aeration of the waste water from which the fine bubble generation means and the swing bed are installed and the levitated substance is separated A contact aeration tank for processing, a biological filtration tank for filtering the waste water after the aeration process, which is equipped with a fine bubble generating means and a filter medium made of rare earth minerals, and a levitated substance separated in the flotation separation tank are stored. Multifunctional processing equipment including floating substance storage / decomposition tank that decomposes
A filter medium comprising fine bubble generating means and a rare earth mineral is installed, a filtration tank that further filters the wastewater that has passed through the biological filtration tank, and treatment wastewater that has passed through the filtration tank can be stored and discharged to the outside. Filtration / discharge tank including discharge tank,
A wastewater treatment system characterized by comprising:   The wastewater treatment system according to claim 1, wherein at least one of the anaerobic tank or the aerobic tank includes a filter medium made of a rare earth mineral.   The wastewater treatment system according to claim 1 or 2, wherein the wastewater is livestock wastewater. A purification system installed in a certain area surrounded by a shielding wall that reaches the impermeable layer under the contaminated soil and has a water shielding effect,
A relay tank having a pump for pumping contaminated groundwater from a groundwater area above the impermeable layer, and a water pump for pumping the pumped contaminated groundwater to the outside;
A flotation separation tank that has fine bubble generating means and separates levitated material from contaminated groundwater sent from the relay tank, and contaminated groundwater in which the fine bubble generating means and the swing bed are installed and the levitated material is separated. A contact aeration tank for performing aeration treatment of the above, a biological filtration tank for filtering the contaminated groundwater after the aeration treatment in which a fine bubble generating means and a filtering material made of rare earth minerals are installed, and the floating separation tank separated A multi-function processing device including a levitated material storage / decomposition tank for storing and decomposing levitated material,
A filter tank that is provided with a filter medium comprising fine bubble generating means and a rare earth mineral, and further filters contaminated groundwater that has passed through the biological filter tank;
Return means for returning the treated groundwater that has passed through the filtration tank to the unmodified soil layer above the groundwater area,
A purification system characterized by comprising:

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