CN116002894A - System and method for treating domestic waste leachate - Google Patents

Abstract

The invention discloses a domestic garbage leachate treatment system, comprising a PLC control system, a pretreatment system, a treatment system, a discharge system, and a remote functional system. The pretreatment system is used to filter the leachate to be treated and adjust the water quality; It is a multi-stage treatment process that combines the pretreated leachate with physical and biological technology; the discharge system is used to discharge the supernatant treated by the treatment system; the PLC control system and remote function system are used to automatically control the said Pretreatment systems, treatment systems and discharge systems. The invention also discloses a treatment method for domestic garbage leachate. The invention provides a domestic garbage leachate treatment system and method, adopting a multi-stage treatment process combining physics and biological technology, the effluent water quality is good and stable, integrated and highly integrated design, less land occupation, high degree of automation, and unmanned On-duty, low operation and maintenance costs, and can achieve high-efficiency and low-cost treatment of leachate.

Description

System and method for treating domestic waste leachate

technical field

The invention is applicable to the technical field of domestic waste treatment, and in particular relates to a domestic waste leachate treatment system and method.

Background technique

With the rapid development of urban construction and the growth of urban population, urban garbage has become one of the main factors of global environmental pollution. The urban waste transfer station is an important hub for urban waste collection and treatment, a hub connecting waste generation sources and terminal treatment systems, and an essential link in the urban domestic waste collection, transportation and disposal system.

The waste transfer station mainly includes domestic waste, kitchen waste, kitchen waste, and a small amount of industrial waste. The waste water generated by the waste transfer station mainly includes flushing waste water and landfill leachate. Among them, the washing wastewater mainly includes the wastewater produced by washing the ground, vehicles and equipment; the landfill leachate is the waste water generated during the garbage compression process. Since the garbage components are mainly domestic garbage, the landfill leachate produced during the garbage compression process has high oil, The characteristics of high organic matter and high suspended solids: high COD, high ammonia nitrogen, high suspended solids, wide range of water quality changes, and strong stench, black or taupe.

Although the garbage stays in the garbage transfer station for a short time and the leachate output is small, due to the high pollution of the leachate, if it is directly discharged into the municipal sewage pipe network without effective treatment, it will not only corrode the pipes, but also damage the municipal drainage system in the long run , Sewage leakage is more likely to occur, overdrawing the treatment capacity of the sewage treatment plant, and ultimately destroying the smooth operation of the sewage treatment plant, resulting in sludge disorder in the sewage plant, effluent quality exceeding the standard, and causing serious negative effects of surface water basin pollution in large areas. The existing leachate treatment facilities of relevant garbage transfer stations are mainly the supporting sewage treatment facilities of the transfer station and urban sewage plants. The treatment technologies mainly include physical and chemical methods, biochemical methods, land methods and their combined methods. These technologies often have treatment Disadvantages such as unsatisfactory effect, large floor area, high investment and energy consumption.

Contents of the invention

In view of the above-mentioned problems currently existing, the present invention provides a domestic waste leachate treatment system and method, which adopts a multi-stage treatment process combining physics and biological technology, and the effluent water quality is good and stable, integrated and highly integrated design, occupying a small area, It has a high degree of automation, can be unattended, and has low operation and maintenance costs, which can realize high-efficiency and low-cost treatment of leachate.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

A domestic garbage leachate treatment system, including a PLC control system, a pretreatment system, a treatment system, a discharge system, and a remote functional system. The pretreatment system is used to filter the leachate to be treated and adjust the water quality to remove coarse floating matter and suspension; the treatment system is used for the pretreated leachate to undergo a multi-stage treatment process combining physical and biological technologies; the discharge system is used to discharge the supernatant treated by the treatment system; The PLC control system and remote function system are used to automatically control the pretreatment system, treatment system and discharge system.

According to one aspect of the present invention, the pretreatment system includes a grid and a primary sedimentation adjustment tank connected in sequence.

According to one aspect of the present invention, the pretreatment system includes a grid, a grease trap, a grit chamber and a primary sedimentation adjustment tank connected in sequence.

According to one aspect of the present invention, the treatment system includes sequentially connected anaerobic reactors, anoxic tanks, aerobic tanks, secondary sedimentation tanks, phosphorus removal tanks, and final sedimentation tanks.

According to one aspect of the present invention, the treatment system includes sequentially connected anaerobic reactors, anoxic tanks, aerobic tanks, secondary sedimentation tanks, final sedimentation tanks, phosphorus removal tanks, and clean water tanks.

According to one aspect of the present invention, the aerobic tank and the phosphorus removal tank are equipped with an aeration system, and the aeration system is connected with a blower.

According to one aspect of the present invention, an alarm protection system is also included, and the alarm protection system is connected with the PLC control system.

According to one aspect of the present invention, fillers are provided in the aerobic tank.

A method for treating domestic waste leachate, comprising the steps of:

Pretreatment step: filter the leachate to be treated through the pretreatment system, and adjust the water quality;

Treatment steps: through the treatment system, the pretreated leachate is subjected to a multi-stage treatment process combining physical and biological technologies;

Monitoring step: automatically controlling the operation of the pretreatment system and the treatment system through the PLC control system and the remote function system.

The advantages of the implementation of the present invention: the integrated and highly integrated design of the domestic garbage leachate treatment system not only occupies a small area, but also can be installed in the open air without a special machine room. The installation and debugging are simple and the cycle is short; Level treatment process, effluent water quality is good and stable, advanced technology, enough to achieve high efficiency and low cost treatment of leachate; set up remote function system and PLC control system, the equipment can be monitored by computer, mobile phone, etc. through the Internet, and the alarm information of the equipment can be pushed to The specified mobile phone can be remotely maintained and upgraded through the computer, with a high degree of automation, unattended operation, and low operation and maintenance costs.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

Fig. 1 is the schematic diagram of the three-dimensional structure of the domestic waste leachate treatment system of the present invention;

Fig. 2 is a top view structural schematic diagram of the domestic waste leachate treatment system according to the present invention;

Fig. 3 is the leachate flow schematic diagram of the domestic waste leachate treatment system of the present invention;

Fig. 4 is a schematic flow chart of the domestic waste leachate treatment system according to the present invention.

In Figure 1-4, 1. Equipment room; 2. Anaerobic reactor; 3. Anoxic tank; 4. Aerobic tank; 5. Secondary sedimentation tank; 6. Clear water tank; 7. Final sedimentation tank; One phosphorus removal pool; 9. The second phosphorus removal pool.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figure 1, Figure 2, Figure 3, and Figure 4, a domestic waste leachate treatment system includes a PLC control system, a pretreatment system, a treatment system, a discharge system, and a remote functional system. The pretreatment system includes sequentially The connected grid and the primary sedimentation adjustment tank, the domestic waste leachate enters the grid through a quantitative pump, and the treatment system includes an anaerobic reactor 2 connected in sequence, an anoxic tank 3, an aerobic tank 4, and a secondary sedimentation tank 5. The final sedimentation tank 7, the phosphorus removal tank, and the clear water tank 6 are connected by a lift pump between the primary sedimentation adjustment tank and the anaerobic reactor 2, and the leachate is homogenized in the primary sedimentation adjustment tank by the The lift pump lifts into the anaerobic reactor 2 for anaerobic degradation reaction. The anaerobic reactor 2 is connected to the first sludge discharge system, and the first sludge discharge system includes the first sludge return system and the first excess sludge Exclusion system, the first sludge return system is connected to the anaerobic reactor 2 for sludge circulation, the mixed liquid return system is set between the aerobic pool 4 and the anoxic pool 3, and the second settling tank 5 is set Two sludge discharge systems, the second sludge discharge system includes a second sludge return system and a second excess sludge removal system, the second sludge return system is connected to the anoxic tank 3, and the depth is set in the phosphorus removal tank Phosphorus removal treatment system. The PLC control system is connected with the pretreatment system, treatment system, discharge system and remote functional system. Specifically, the PLC control system can be set in the equipment room 1, the PLC control system includes a PLC controller and a touch screen, the touch screen is connected to the PLC controller, and the touch screen is used to display equipment status and alarm information, so A control program is preset in the PLC controller, and the control program is used to issue control commands according to the parameters set by the touch screen and the remote functional system, such as controlling the quantitative pump, the lifting pump, the solenoid valves on each pipeline, and the switch button etc. to control. The remote function system can monitor the equipment through the Internet remote platform, using computers, mobile phones, etc., and the alarm information of the equipment is pushed to the designated mobile phone. The system can be remotely maintained and upgraded through the computer. The discharge system is used for discharging the supernatant liquid treated by the treatment system.

When working, the pretreatment system is used to filter the leachate to be treated and adjust the water quality to remove coarse floating and suspended matter in the sewage, reduce the load of the subsequent treatment process and ensure the stable operation of subsequent operating equipment such as water pumps, etc., for Subsequent processing creates better conditions. The treatment system passes the pretreated leachate through a multi-stage treatment process combining physical and biological technologies. The process is advanced, the effluent quality is good and the operation is stable, so that the treated leachate meets the "Water Quality Standard for Wastewater Discharge into Urban Sewers" ",Discharge. At the same time, it adopts PLC control system and remote functional system, which has a high degree of automation, can be unattended, and has low operation and maintenance costs, which can realize high-efficiency and low-cost leachate treatment.

In practical application, a grease trap and a grit chamber are arranged between the grid and the primary sedimentation regulating tank. The grease trap is used for degreasing pretreatment of the effluent after passing through the grid, and the grit chamber is used to remove small particle suspended matter.

In practical application, the anoxic pool 3 and the aerobic pool 4 constitute an improved contact oxidation pool, that is, an A/O combination pool with a significant denitrification effect, and the organic matter is further decomposed under the joint action of nitrifying bacteria and denitrifying bacteria respectively. , to achieve the purpose of biological denitrification.

The biological treatment process of the A/O combined pool adopts the push-flow biological contact oxidation tank, and its treatment is better than that of the complete mixed type or the second and third series series complete mixed biological contact oxidation tanks. And it is smaller than the activated sludge tank, has strong adaptability to water quality, good impact resistance, stable effluent quality, and no sludge bulking.

In practical applications, the aerobic pool 4 can adopt novel elastic three-dimensional fillers, which have a large actual specific surface area, convenient microbial film formation and film removal, and have a higher removal rate of organic matter than other fillers under the same organic load conditions. Can improve the solubility of oxygen in the air in water.

In practical applications, liquid level sensors may be installed in the anaerobic reactor 2, the anoxic tank 3 and the aerobic tank 4, and the liquid level sensors are respectively connected to the PLC control system.

In practical application, the phosphorus removal tank includes a first phosphorus removal tank 8 and a second phosphorus removal tank 9 connected in sequence. Due to the relatively high phosphorus content in wastewater, the phosphorus consumed by the growth and reproduction of microorganisms and the phosphorus carried out of the system by excess sludge discharge are very limited. Therefore, a deep phosphorus removal treatment system is configured, and high-efficiency removal Phosphorus. Specifically, the deep phosphorus removal treatment system includes an air stirring device for sufficient stirring, and the air stirring device is an existing device and can be selected according to actual conditions.

In practical application, the aerobic tank 4 and the phosphorus removal tank are connected with an aeration system. The aeration system includes an aeration inlet pipe, one end of the aeration inlet pipe communicates with the aerobic tank 4 and the phosphorus removal tank through the aeration branch pipe, and the other end is connected with a blower, and the aeration branch pipe is connected with an aeration pipe. An air head, the aeration head can be selected as a diffuse aerator or a microporous aerator. The dissolved oxygen transfer rate of the microporous aerator is higher than that of other aerators. It is not aging, light in weight, long in service life, and has the advantages of corrosion resistance and not easy to block. Through aeration, provide sufficient oxygen for the aerobic tank 4 and the phosphorus removal tank.

In practical applications, the domestic waste leachate treatment system also includes an alarm and protection system. When the equipment and operating conditions are abnormal, the equipment will send out an alarm prompt in time and automatically shut down for protection. Specifically, the system alarm information can be pushed to the designated mobile phone, and the system can be remotely maintained and upgraded through the computer.

In practical applications, the size of the domestic waste leachate treatment system can be determined according to the amount of domestic waste leachate treatment, for example, it is set to 6.0m*1.5m*2.5m.

The invention also discloses a method for treating domestic waste leachate, comprising the steps of:

Pretreatment step: filter the leachate to be treated through the pretreatment system, and adjust the water quality;

Treatment steps: through the treatment system, the pretreated leachate is subjected to a multi-stage treatment process combining physical and biological technologies;

Monitoring step: automatically controlling the operation of the pretreatment system and the treatment system through the PLC control system and the remote function system.

In practical applications, the effluent from the anaerobic reactor 2 flows into the improved contact oxidation tank by itself. Under anoxic conditions, the denitrifying bacteria facultative denitrification bacteria use the carbon source material in the raw water as an electron donor, and the aerobic tank 4 backflows The incoming nitrate nitrogen acts as an electron acceptor, reduces nitrate, releases molecular nitrogen or nitrous oxide, and completes the denitrification reaction. While the anoxic pool 3 completes the denitrification of the reflux in the aerobic pool 4, heterotrophic bacteria also hydrolyze suspended pollutants such as starch, fiber, carbohydrates, and soluble organic matter in the sewage into organic acids, and the hydrolyzed products enter the aerobic pool 4 . The sewage in the aerobic section can decarbonize and oxidize most of the carbon sources and oxidize more than 90% of the ammonia nitrogen into nitrate nitrogen. The aerobic pool 4 is set to return the mixed solution to the anoxic section. Stage denitrification into nitrogen exhaust system. The effluent from the aerobic tank 4 flows into the secondary settling tank 5 by itself. Under the action of natural coagulation and gravity, the biological sludge can settle to the mud hopper at the bottom of the secondary settling tank 5. The secondary settling tank 5 is equipped with a sludge return system and an excess sludge removal system. The sludge returns to the anoxic tank 3, its main purpose and function is to increase and maintain the effective sludge concentration of the reaction tank, reduce the volume of the anoxic tank 3 and prolong the separation of SRT and HRT; The denitrification of the pool 3 can recover part of the alkalinity and oxygen demand, not only can maintain the alkalinity of the effluent but also reduce the oxygen demand of the aerobic pool 4. The supernatant from the secondary sedimentation tank 5 will flow into the final sedimentation tank 7 of the next treatment, and the supernatant from the final sedimentation tank 7 will flow into the next treatment phosphorus removal tank by itself. After fully reacting in the phosphorus removal tank, the mixed solution will flow into the clean water by gravity Pool 6 separates the physical and chemical sludge from the supernatant, and the physical and chemical sludge is promptly discharged to the system for further treatment and disposal. The supernatant after precipitation is disinfected and discharged up to standard. The remaining biological sludge in the anaerobic reactor 2 and the secondary settling tank 5 and the physical and chemical sludge in the final settling tank 7 are discharged into the movable temporary sludge storage tank in time, and after reaching a certain amount, they are transported to a professional unit for treatment and disposal. Avoid secondary pollution.

The advantages of the implementation of the present invention: the integrated and highly integrated design of the domestic garbage leachate treatment system not only occupies a small area, but also can be installed in the open air without a special machine room. The installation and debugging are simple and the cycle is short; Level treatment process, effluent water quality is good and stable, advanced technology, enough to achieve high efficiency and low cost treatment of leachate; set up remote function system and PLC control system, the equipment can be monitored by computer, mobile phone, etc. through the Internet, and the alarm information of the equipment can be pushed to The specified mobile phone can be remotely maintained and upgraded through the computer, with a high degree of automation, unattended operation, and low operation and maintenance costs.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any skilled person familiar with the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (9)

1. The domestic garbage leachate treatment system is characterized by comprising a PLC control system, a pretreatment system, a treatment system, a discharge system and a remote functional system, wherein the pretreatment system is used for filtering leachate to be treated and adjusting water quality so as to remove coarse floaters and suspensions in sewage; the treatment system is used for carrying out a multistage treatment process of combining physical and biological technologies on the pretreated percolate; the discharge system is used for discharging the supernatant liquid treated by the treatment system; the PLC control system and the remote function system are used for automatically controlling the pretreatment system, the treatment system and the emission system.

2. A domestic waste leachate treatment system according to claim 1, wherein the pretreatment system comprises a grid and a primary sedimentation regulating tank which are connected in sequence.

3. The domestic garbage leachate treatment system according to claim 1, wherein the pretreatment system comprises a grid, an oil separation tank, a sand sedimentation tank and a primary sedimentation regulating tank which are sequentially connected.

4. The system for treating domestic garbage leachate according to claim 1, wherein the treatment system comprises an anaerobic reactor, an anoxic tank, an aerobic tank, a secondary sedimentation tank, a dephosphorization tank and a final sedimentation tank which are connected in sequence.

5. The system of claim 1, wherein the system further comprises an anaerobic reactor, an anoxic tank, an aerobic tank, a secondary sedimentation tank, a final sedimentation tank, a dephosphorization tank, and a clean water tank, which are connected in sequence.

6. The system of claim 1, wherein the aerobic tank and the dephosphorization tank are provided with aeration systems, and the aeration systems are connected with a blower.

7. The household garbage leachate treatment system of claim 1, further comprising an alarm protection system, wherein the alarm protection system is connected with the PLC control system.

8. The domestic garbage leachate treatment system according to claim 1, wherein a filler is arranged in the aerobic tank.

9. The domestic garbage leachate treatment method is characterized by comprising the following steps of:

pretreatment: filtering percolate to be treated through a pretreatment system, and regulating water quality;

the processing steps are as follows: the pretreated percolate is subjected to a multistage treatment process combining physical and biological technologies through a treatment system;

the monitoring step comprises the following steps: and the operation of the pretreatment system and the treatment system is automatically controlled by a PLC control system and a remote function system.

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