CN112811750A - Full-quantitative treatment system and treatment method for leachate of domestic garbage landfill - Google Patents
Full-quantitative treatment system and treatment method for leachate of domestic garbage landfill Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/07—Alkalinity
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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Abstract
The invention discloses a full-quantitative treatment system and a treatment method for leachate of a domestic garbage landfill, wherein the treatment system comprises a regulating tank, a primary A/O system, an intermediate sedimentation tank, a secondary A/O system, an MBR (membrane bioreactor) system, a nanofiltration membrane system and a total nitrogen deep treatment device which are sequentially connected. The treatment method adopts a three-stage denitrification process with independently controlled working conditions at all levels, and realizes the standard discharge of total nitrogen through two-stage heterotrophic nitrification and denitrification and one-stage autotrophic denitrification. The method overcomes the defects of disordered carbon-nitrogen ratio, low biodegradability, difficult standard reaching of total nitrogen of the effluent and the like of the leachate of the domestic garbage landfill, improves the denitrification efficiency of the heterotrophic denitrification process, and realizes the purpose of stable standard reaching of the total nitrogen and COD of the effluent.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a full-quantitative treatment system and a full-quantitative treatment method for leachate of a domestic garbage landfill.
Background
With the construction and development of cities and towns in China and the improvement of the living standard of people, the yield of household garbage in cities and towns is increasing day by day. During the treatment process, a large amount of high-concentration toxic and harmful landfill leachate is generated. Leachate generated by landfill or incineration is rich in a large amount of nitrogen and phosphorus elements, and is an important pollution source of a water body if active and effective measures are not taken for treatment. According to the collected data at present, leachate generated by landfill or incineration is almost equal to the pronoun of high ammonia nitrogen wastewater, the ammonia nitrogen content is high, other components are complex to change, and a plurality of problems can occur in the actual regulation and control treatment, such as carbon-nitrogen ratio imbalance, lack or exceeding of the content of certain trace elements (inhibiting and poisoning effects on the growth of microorganisms), and the like, so that the stable operation and the standard discharge of the landfill leachate are difficult.
The landfill leachate is high ammonia nitrogen waste water, the domestic garbage landfill leachate is high in ammonia nitrogen and serious in carbon-nitrogen ratio imbalance, and the problem that how to ensure that the total nitrogen of the effluent stably reaches the standard is a pain point of the industry.
Accordingly, further developments and improvements are still needed in the art.
Disclosure of Invention
Aiming at various defects in the prior art and solving the problems, a full-quantitative treatment system and a treatment method for leachate of a domestic garbage landfill are provided so as to achieve the purposes of optimizing a heterotrophic denitrification process, improving the denitrification efficiency of the heterotrophic denitrification process, reducing the running cost of the heterotrophic denitrification process and ensuring that the total nitrogen and COD in effluent can stably reach the standard by adopting an NF + autotrophic denitrification filter as an advanced treatment process.
In order to achieve the purpose, the invention provides the following technical scheme:
a full-quantitative treatment system for percolate generated by a household garbage landfill comprises a regulating tank, a primary A/O system, an intermediate sedimentation tank and a secondary A/O system, wherein the regulating tank is used for balancing the quality and the quantity of water of the percolate generated by the household garbage landfill, the primary A/O system is used for degrading COD, ammonia nitrogen and total nitrogen of the percolate balanced by the regulating tank, the intermediate sedimentation tank is used for separating the mud from the water and removing dissolved oxygen of a primary degraded mixed solution obtained by the primary A/O system, the secondary A/O system is used for secondarily removing the total nitrogen of a clear solution obtained by the separation of the intermediate sedimentation tank, the device comprises an MBR (membrane bioreactor) membrane system for carrying out mud-water separation on mixed liquid subjected to secondary total nitrogen removal by a secondary A/O (anoxic/oxic) system, a nanofiltration membrane system for carrying out COD (chemical oxygen demand) and divalent salt interception on clear liquid obtained after separation by the MBR membrane system, and a total nitrogen advanced treatment device for carrying out total nitrogen advanced removal on the clear liquid obtained by the nanofiltration membrane system.
And the water outlet of the nanofiltration concentrate treatment device is communicated with the water inlet of the A tank in the primary A/O system.
Furthermore, a water inlet TN and COD online detection device for detecting the water quality of the inlet water at the water inlet of the primary A/O system and a primary A tank external carbon source adding device for adding a carbon source to the A tank in the primary A/O system according to data obtained by the water inlet TN and COD online detection device are arranged at the water inlet of the primary A/O system.
Furthermore, a total nitrogen online monitoring device for monitoring total nitrogen data in clear liquid at the water inlet of the secondary A/O system in real time and a secondary A pool external carbon source adding device for adding a carbon source to the A pool of the secondary A/O system according to the total nitrogen data monitored by the total nitrogen online monitoring device are arranged at the water inlet of the secondary A/O system.
Furthermore, an alkalinity on-line monitoring instrument and an alkalinity medicine feeding device are arranged at a water inlet of the total nitrogen advanced treatment device, and alkalinity required to be consumed is supplemented to the total nitrogen advanced treatment device in real time through the alkalinity on-line monitoring instrument and the alkalinity medicine feeding device.
Furthermore, the nanofiltration membrane element in the nanofiltration membrane system is a GE nanofiltration membrane element for improving the COD removal capacity of MBR produced water.
Furthermore, the total nitrogen advanced treatment device comprises an autotrophic denitrification filter and a water and gas distribution device matched with the autotrophic denitrification filter, wherein the filter material of the autotrophic denitrification filter is an autotrophic nitrogen removal filter material, and the water and gas distribution device is a filter brick.
A full-quantitative treatment method for leachate of a domestic garbage landfill comprises the following steps:
s1, performing water quality and water quantity equalization treatment on the percolate in a regulating tank, and then entering a first-stage A/O system for degradation of COD, ammonia nitrogen and total nitrogen;
s2, connecting the mixed liquid degraded by the primary A/O system to an intermediate sedimentation tank for mud-water separation and dissolved oxygen removal;
s3, inoculating the clear liquid separated by the intermediate sedimentation tank into a secondary A/O system to carry out secondary removal on the total nitrogen;
s4, carrying out sludge-water separation on the mixed liquid subjected to total nitrogen removal by the secondary A/O system through an MBR membrane system to obtain clear liquid;
s5, after collecting and caching the clear liquid in the step S4, lifting the clear liquid to a nanofiltration membrane system to intercept COD and divalent salt, and collecting and caching the produced water;
and S6, lifting the produced water in the step S5 to a total nitrogen advanced treatment device for total nitrogen advanced removal treatment.
Further, in step S5, the nanofiltration concentrate generated by the nanofiltration membrane system is processed by the nanofiltration concentrate processing apparatus, and the processed wastewater flows back to the a tank of the primary a/O system for biochemical processing.
And further, a carbon source is supplemented to the A pool of the first-stage A/O system in real time through an influent TN and COD online detection device and a first-stage A pool external carbon source adding device, a carbon source is supplemented to the A pool of the second-stage A/O system in real time through a total nitrogen online monitoring device and a second-stage A pool external carbon source adding device, and the required consumed alkalinity is added to the total nitrogen deep treatment device in real time through an alkalinity online monitoring instrument and an alkalinity adding device.
Advantageous effects
The invention provides a full-quantitative treatment system and a treatment method for leachate of a domestic garbage landfill, aiming at solving the problems of high ammonia nitrogen content, difficult standard reaching of carbon-nitrogen ratio imbalance total nitrogen, high operation cost and the like of the leachate of the meal domestic garbage landfill, and compared with the prior art, the full-quantitative treatment system and the treatment method for the leachate of the domestic garbage landfill have the following beneficial effects:
(1) after the intermediate sedimentation tank is arranged between the first-stage A/O system and the second-stage A/O system, the working conditions of the first-stage A/O system and the second-stage A/O system can be independently controlled, and the adjustment of the total nitrogen removal capacity and efficiency of each stage is facilitated.
(2) And a total nitrogen online monitoring device is arranged at a water inlet of the secondary A/O system, and the accurate feeding and the efficient utilization of an external carbon source are realized through a PLC (programmable logic controller).
(3) The total nitrogen advanced treatment device is arranged at the water production end of the nanofiltration membrane system, and the preferred autotrophic denitrification filter tank does not need an additional carbon source, so that the impact resistance is strong, and the effluent quality is stable.
(4) The autotrophic denitrification filter does not need an additional carbon source, has low operation cost and does not have the risk of COD exceeding standard caused by adding the carbon source.
(5) The alkalinity on-line monitoring instrument is arranged at the water inlet of the total nitrogen advanced treatment device, and the alkalinity dosing device is controlled by the PLC to realize accurate dosing of the medicament, so that the automation and the intelligence are high, the manual consumption in operation is low, and the operation efficiency is high.
(6) The nanofiltration concentration treatment device adopts a coagulation sedimentation and advanced oxidation treatment technology, the treated wastewater has high biodegradability and can flow back to the tank A in the primary A/O system for biochemical treatment, the zero discharge of concentrated solution is realized, and the treatment efficiency of the domestic garbage landfill leachate full-quantitative treatment system is improved.
Drawings
Fig. 1 is a schematic structural diagram of a full-scale treatment system for leachate in a domestic refuse landfill in embodiment 1 of the present invention;
fig. 2 is a flowchart of a treatment method using a full-scale treatment system for leachate in a domestic refuse landfill in embodiment 1 of the present invention;
in the drawings: 1. a regulating tank; 2. the online detection device for the intake TN and COD; 3. a carbon source adding device is additionally arranged in the first-stage A pool; 4. a primary A/O system; 5. an intermediate sedimentation tank; 6. total nitrogen on-line monitoring equipment; 7. a carbon source adding device is additionally arranged in the second-stage A pool; 8. a secondary A/O system; 9. MBR membrane system; 10. a nanofiltration membrane system; 11. an alkalinity on-line monitoring instrument; 12. an alkalinity dosing device; 13. a total nitrogen advanced treatment device; 14. nanofiltration concentrate processing unit.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following description is given for clear and complete description of the technical solution of the present invention with reference to the embodiments of the present invention, and other similar embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present application shall fall within the protection scope of the present application. In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are directions with reference to the drawings only, and thus, the directional terms are used for illustrating the present invention and not for limiting the present invention.
Detailed description of the preferred embodiment 1
A full-quantitative treatment system for percolate in a domestic garbage landfill, as shown in figure 1, the device comprises a regulating tank 1 for balancing the water quality and the water quantity of percolate generated by a domestic garbage landfill, a primary A/O system 4 for degrading COD, ammonia nitrogen and total nitrogen of the percolate balanced by the regulating tank 1, an intermediate sedimentation tank 5 for performing mud-water separation and dissolved oxygen removal on primary degraded mixed liquor obtained by the primary A/O system 4, a secondary A/O system 8 for performing secondary total nitrogen removal on clear liquor obtained by separation of the intermediate sedimentation tank 5, an MBR membrane system 9 for performing mud-water separation on the mixed liquor subjected to secondary total nitrogen removal by the secondary A/O system 8, a nanofiltration membrane system 10 for intercepting COD and divalent salt of the clear liquor obtained by separation of the MBR membrane system 9, and a total nitrogen deep treatment device 13 for performing deep total nitrogen removal on the clear liquor obtained by the nanofiltration membrane system 10, which are sequentially connected.
The invention collects the percolate of the domestic garbage landfill to the regulating tank 1 and then promotes the percolate to a two-stage A/O system, degrades pollutants such as COD, ammonia nitrogen and the like in the wastewater through activated sludge, and optimizes the operation condition of the A/O system of each stage by arranging the intermediate sedimentation tank 5. The microorganisms in the intermediate sedimentation tank 5 breathe and consume dissolved oxygen, the MBR produced water is subjected to advanced treatment by the nanofiltration membrane system 10, and the produced water of the nanofiltration membrane system 10 is subjected to advanced denitrification by the total nitrogen advanced treatment device 13.
Further, the full-scale treatment system for the percolate of the household garbage landfill also comprises a nanofiltration concentrate treatment device 14 connected to the concentrate outlet of the nanofiltration membrane system 10, and the water outlet of the nanofiltration concentrate treatment device 14 is communicated with the water inlet of the A tank in the primary A/O system 4 through a pipeline.
Specifically, a first lifting water pump for lifting the percolate balanced by the regulating tank 1 into the primary A/O system 4 is arranged between the regulating tank 1 and the primary A/O system 4.
Furthermore, a water inlet TN and COD online detection device 2 and a primary A pool external carbon source adding device 3 are arranged at a water inlet of the primary A/O system 4, water quality detection is carried out on inlet water at the water inlet of the primary A/O system 4 through the water inlet TN and COD online detection device 2, total nitrogen data and chemical oxygen demand data of the inlet water are obtained, then the primary A pool external carbon source adding device 3 adds a carbon source to the A pool of the primary A/O system 4 in real time according to the obtained total nitrogen data and chemical oxygen demand data of the inlet water, and the purpose of adjusting the carbon source adding amount of the primary A/O system 4 in real time according to the total nitrogen data is achieved. Specifically, the external PLC is used for receiving total nitrogen data and chemical oxygen demand data signals of inlet water obtained by the inlet water TN and COD online detection device 2 in real time, and sending a carbon source adding amount control signal to the first-stage A tank external carbon source adding device 3 in real time according to the total nitrogen data and the chemical oxygen demand data signals of the inlet water, so that the real-time control of the A tank carbon source adding amount in the first-stage A/O system 4 is realized.
Specifically, in this embodiment, the intermediate settling tank 5 is a vertical settling tank. An intermediate sedimentation tank 5 is additionally arranged between the primary and secondary nitrification and denitrification to realize the independent control of the working conditions of the primary and secondary denitrification systems; and measures such as reducing the dissolved oxygen amount of the water inlet of the A tank in the secondary A/O system 8 by utilizing the intermediate sedimentation tank 5 for oxygen elimination.
Further, a total nitrogen online monitoring device 6 for monitoring total nitrogen data in clear liquid at the water inlet of the secondary A/O system 8 in real time and a secondary A pool external carbon source adding device 7 for adding a carbon source to the A pool of the secondary A/O system 8 according to the total nitrogen data detected by the total nitrogen online monitoring device 6 are arranged at the water inlet of the secondary A/O system 8. The total nitrogen data in the clear liquid at the water inlet of the secondary A/O system 8 is monitored in real time through the total nitrogen online monitoring equipment 6, the carbon source adding device 7 additionally arranged in the secondary A pool controls the adding amount of the carbon source entering the secondary A/O system 8 in real time according to the total nitrogen data obtained by the total nitrogen online monitoring equipment 6 in real time, the purpose of adjusting the adding amount of the carbon source of the secondary A/O system 8 in real time according to the total nitrogen data is achieved, therefore, the accurate adding and efficient utilization of the carbon source are achieved, and the total nitrogen removal rate of the A pool in the secondary A/O system 8 and the utilization rate of the carbon source are improved. Specifically, through a theoretical computer actual project test of the denitrification carbon-nitrogen ratio, a total nitrogen data signal of the total nitrogen on-line monitoring equipment 6 is received through an external PLC, and a real-time carbon source adding amount control signal is sent to the secondary A pool external carbon source adding device 7 according to the total nitrogen data signal, so that the real-time control of the carbon source adding amount of the A pool in the secondary A/O system 8 is realized, and the adding accuracy and the utilization rate of the supplemented carbon source are improved.
Specifically, a second lifting water pump for lifting the clear liquid obtained after the MBR membrane separation into the nanofiltration membrane system 10 is arranged between the MBR membrane system 9 and the nanofiltration membrane system 10.
Furthermore, the nanofiltration membrane element in the nanofiltration membrane system 10 is a GE nanofiltration membrane element for improving the removal capacity of the COD of the MBR produced water, so as to ensure that the COD of the effluent reaches the standard and reduce the influence of the COD of the effluent on the rear-end autotrophic denitrification.
Further, an alkalinity on-line monitoring instrument 11 is arranged at a water inlet of the total nitrogen advanced treatment device 13, and alkalinity required to be consumed is supplemented to the total nitrogen advanced treatment device 13 in real time through the alkalinity on-line monitoring instrument 11 and the alkalinity dosing device 12. Specifically, the alkalinity signal in the clear liquid at the water inlet of the total nitrogen advanced treatment device 13 is received through the external PLC, and the dosing quantity control signal is sent to the alkalinity dosing device 12 in real time according to the alkalinity signal, so that the alkalinity of the clear liquid at the water inlet of the total nitrogen advanced treatment device 13 is controlled in real time.
Further, the total nitrogen advanced treatment device 13 comprises an autotrophic denitrification filter, a water and gas distribution device, an air flushing system and a water backwashing system, wherein the water and gas distribution device, the air flushing system and the water backwashing system are used for being matched with the autotrophic denitrification filter, the autotrophic denitrification filter adopts an upflow denitrification filter, and a filter material in the autotrophic denitrification filter adopts an autotrophic nitrogen removal filter material, is a high-efficiency microorganism carrier and a high-efficiency electron donor, ensures the stable operation of autotrophic denitrification, and can play a certain physical filtering role at the same time. The water and gas distributing device is made of filter bricks, and the water and gas distributing device in the form of the filter bricks has the characteristics of effectively reducing the construction difficulty and being free of maintenance. Specifically, an alkalinity on-line monitoring instrument 11 and an alkalinity dosing device 12 are both arranged at a water inlet of the autotrophic denitrification filter. The total nitrogen advanced treatment device 13 is used for removing total nitrogen substances in the produced water of the nanofiltration membrane system 10. A third lifting water pump for lifting the water produced by the nanofiltration membrane system 10 into the total nitrogen advanced treatment device 13 is arranged between the nanofiltration membrane system 10 and the total nitrogen advanced treatment device 13. The produced water of the nanofiltration membrane system 10 is lifted by a third water pump to enter a water distribution system of a total nitrogen advanced treatment device 13, then flows upwards and is subjected to denitrification reaction by autotrophic denitrifying bacteria attached to the filler to convert nitrate into nitrogen and finish denitrification. When microorganisms on the filler fall to block the water flow ascending channel, a backwashing fan or a water pump can be adopted for washing.
Preferably, a filter for ensuring the accuracy of the online detection data of the total nitrogen online monitoring device 6 is arranged between the intermediate sedimentation tank 5 and the total nitrogen online monitoring device 6, so that the maintenance frequency of the total nitrogen online monitoring device 6 is reduced.
A treatment method using the full-quantitative treatment system for leachate in the domestic refuse landfill as shown in FIG. 2 comprises the following steps:
s1, performing water quality and water quantity equalization treatment on the percolate in a regulating tank, and then entering a first-stage A/O system for degradation of COD, ammonia nitrogen and total nitrogen;
specifically, percolate generated by a household garbage landfill is collected and guided to a regulating tank, and water quality and water quantity are balanced in the regulating tank; and (4) lifting the percolate balanced by the regulating tank to a first-level A/O system, and supplementing an appropriate amount of external carbon source according to the quality detection of the inlet water to degrade COD, ammonia nitrogen and total nitrogen.
S2, connecting the mixed liquid degraded by the primary A/O system to an intermediate sedimentation tank for mud-water separation and dissolved oxygen removal;
specifically, the clear liquid obtained from the intermediate sedimentation tank is collected.
S3, inoculating the clear liquid separated by the intermediate sedimentation tank into a secondary A/O system to carry out secondary removal on the total nitrogen;
specifically, the clear liquid is connected to a secondary A/O system through an intermediate sedimentation tank, total nitrogen is detected through total nitrogen online monitoring equipment, a carbon source adding device is additionally arranged in the secondary A tank, a carbon source is supplemented to the secondary A/O system A tank in real time, and the total nitrogen in the clear liquid is secondarily removed;
s4, carrying out sludge-water separation on the mixed liquid subjected to total nitrogen removal by the secondary A/O system through an MBR membrane system to obtain clear liquid;
s5, after collecting and caching the clear liquid in the step S4, lifting the clear liquid to a nanofiltration membrane system to intercept COD and divalent salt, and collecting and caching the produced water;
specifically, clear liquid separated by the MBR membrane system is collected and cached, and then lifted into the nanofiltration membrane system by a second lifting water pump, COD and divalent salt in the clear liquid are intercepted by a nanofiltration membrane element in the nanofiltration membrane system, and produced water is collected and cached;
and S6, lifting the produced water in the step S5 to a total nitrogen advanced treatment device for total nitrogen advanced removal treatment.
Specifically, the water produced by the nanofiltration membrane system in the step S6 is collected and cached, and then lifted into the total nitrogen advanced treatment device by the third lift pump to be subjected to total nitrogen advanced removal, and the alkalinity required to be consumed by the total nitrogen advanced treatment device is automatically controlled and supplemented by the alkalinity on-line monitoring instrument and the alkalinity dosing device, and the effluent treated by the total nitrogen advanced treatment device can stably meet the discharge limit requirement of the domestic garbage landfill pollutant control standard.
Specifically, in step S5, the nanofiltration concentrate obtained by the nanofiltration membrane system is treated by a nanofiltration concentrate treatment device by using flocculation and sedimentation and advanced oxidation technologies, and the treated wastewater has high biodegradability and flows back to the a tank in the first-stage a/O system for biochemical treatment, thereby realizing zero discharge of the concentrate.
The invention adopts a three-stage denitrification process with independently controlled working conditions at each stage, and realizes the standard discharge of total nitrogen through two-stage heterotrophic nitrification and denitrification and one-stage autotrophic denitrification. An intermediate sedimentation tank is added between the first-stage A/O system and the second-stage A/O system to realize the purposes of oxygen elimination of the water discharged from the O tank in the first-stage A/O system and independent control of the first-stage nitrification and denitrification activated sludge and the second-stage nitrification and denitrification activated sludge. Meanwhile, the invention combines the characteristics of poor biochemical performance of leachate of the domestic garbage landfill and high COD of MBR effluent, and the total nitrogen advanced treatment device adopts the NF + autotrophic denitrification filter tank to ensure that the total nitrogen and the COD of the effluent can stably reach the standard. The nanofiltration concentrated solution is treated by flocculation precipitation and advanced oxidation, part of divalent salt and refractory organic matters are removed by flocculation precipitation, and the concentrated bioactivities are improved by the advanced oxidation technology, so that the nanofiltration concentrated solution has the conditions of further biochemical treatment and flows back to a front-end biochemical system for treatment, the zero discharge of the concentrated solution is realized, and the treatment efficiency of a domestic garbage landfill leachate treatment system is improved.
The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Claims (10)
1. A full-quantitative treatment system for percolate of a domestic garbage landfill, which is characterized in that, the device comprises a regulating tank, a primary A/O system, an intermediate sedimentation tank, a secondary A/O system, a membrane system, a nanofiltration membrane system and a total nitrogen deep treatment device, wherein the regulating tank is used for carrying out water quality and water quantity equalization on percolate generated by a domestic garbage landfill, the primary A/O system is used for carrying out COD, ammonia nitrogen and total nitrogen degradation on the percolate equalized by the regulating tank, the intermediate sedimentation tank is used for carrying out mud-water separation and dissolved oxygen removal on primary degradation mixed liquor obtained by the primary A/O system, the secondary A/O system is used for carrying out secondary total nitrogen removal on clear liquor obtained by the separation of the intermediate sedimentation tank, the MBR is used for carrying out mud-water separation on the mixed liquor obtained by the secondary total nitrogen removal of the secondary A/O system, the nanofiltration membrane system is used for carrying out COD and divalent salt interception on the clear liquor obtained by.
2. The system for the full-scale treatment of leachate in the municipal solid waste landfill according to claim 1, further comprising a nanofiltration concentrate treatment apparatus connected to the concentrate outlet of the nanofiltration membrane system, wherein the water outlet of the nanofiltration concentrate treatment apparatus is connected to the water inlet of the a tank in the primary a/O system.
3. The system for the full-scale treatment of the leachate in the domestic refuse landfill of claim 1, wherein the water inlet of the primary A/O system is provided with an influent TN and COD online detection device for detecting the water quality of the influent water at the water inlet of the primary A/O system, and a primary A pool external carbon source adding device for adding a carbon source to the A pool in the primary A/O system according to the data obtained by the influent TN and COD online detection device.
4. The system for the full-scale treatment of leachate in domestic refuse landfill of claim 1, wherein the water inlet of the secondary A/O system is provided with a total nitrogen on-line monitoring device for monitoring the total nitrogen data in the clear liquid at the water inlet of the secondary A/O system in real time, and a secondary A pool external carbon source adding device for adding a carbon source to the A pool of the secondary A/O system according to the total nitrogen data monitored by the total nitrogen on-line monitoring device.
5. The system for fully-quantizing leachate in a domestic refuse landfill according to claim 1, wherein an alkalinity on-line monitoring instrument and an alkalinity adding device are arranged at a water inlet of the total nitrogen advanced treatment device, and the alkalinity required to be consumed is supplemented to the total nitrogen advanced treatment device in real time through the alkalinity on-line monitoring instrument and the alkalinity adding device.
6. The system for the full-scale treatment of the leachate in the domestic refuse landfill according to claim 1, wherein the nanofiltration membrane element in the nanofiltration membrane system is a GE nanofiltration membrane element for improving COD removal capability of MBR produced water.
7. The system of claim 1, wherein the advanced treatment unit comprises an autotrophic denitrification filter and a water and gas distributor used in cooperation with the autotrophic denitrification filter, the autotrophic denitrification filter has autotrophic denitrification filter materials, and the water and gas distributor has filter bricks.
8. A full-quantitative treatment method for leachate of a domestic garbage landfill is characterized by comprising the following steps:
s1, performing water quality and water quantity equalization treatment on the percolate in a regulating tank, and then entering a first-stage A/O system for degradation of COD, ammonia nitrogen and total nitrogen;
s2, connecting the mixed liquid degraded by the primary A/O system to an intermediate sedimentation tank for mud-water separation and dissolved oxygen removal;
s3, inoculating the clear liquid separated by the intermediate sedimentation tank into a secondary A/O system to carry out secondary removal on the total nitrogen;
s4, carrying out sludge-water separation on the mixed liquid subjected to total nitrogen removal by the secondary A/O system through an MBR membrane system to obtain clear liquid;
s5, after collecting and caching the clear liquid in the step S4, lifting the clear liquid to a nanofiltration membrane system to intercept COD and divalent salt, and collecting and caching the produced water;
and S6, lifting the produced water in the step S5 to a total nitrogen advanced treatment device for total nitrogen advanced removal treatment.
9. The method of claim 8, wherein in step S5, the nanofiltration concentrate generated by the nanofiltration membrane system is treated by a nanofiltration concentrate treatment device, and the treated wastewater is returned to the A tank of the primary A/O system for biochemical treatment.
10. The method of claim 8, wherein the online TN and COD detection device and the additional carbon source adding device of the first-level A tank supplement the carbon source to the first-level A/O system in real time, the online total nitrogen monitoring device and the additional carbon source adding device of the second-level A tank supplement the carbon source to the second-level A/O system in real time, and the online alkalinity monitoring instrument and the alkalinity adding device add the required consumed alkalinity to the deep total nitrogen treatment device in real time.
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