CN211712895U - Leachate treatment system for waste incineration power plant - Google Patents

Leachate treatment system for waste incineration power plant Download PDF

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CN211712895U
CN211712895U CN202020101305.2U CN202020101305U CN211712895U CN 211712895 U CN211712895 U CN 211712895U CN 202020101305 U CN202020101305 U CN 202020101305U CN 211712895 U CN211712895 U CN 211712895U
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membrane
power plant
waste incineration
treatment system
pipeline
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李选顺
闫胜利
郭朝阳
秦海山
张学飞
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Beijing Capital Environment Technology Co Ltd
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Beijing Capital Environment Technology Co Ltd
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Abstract

The utility model discloses a waste incineration power plant leachate treatment system, include equalizing basin, anaerobism device, the anaerobism water pitcher of producing that connects gradually through the pipeline, AMBR membrane device, membrane deep treatment device and produce the pond, the system still includes sludge impoundment and concentrate collecting pit, anaerobism device and AMBR membrane device are respectively through pipe connection sludge impoundment, membrane deep treatment device passes through the pipe connection concentrate collecting pit. The utility model discloses it is short to have concentrate output low, process flow, and the denitration reductant is done to the retrieval and utilization behind the concentrated enrichment of ammonia nitrogen in the filtration liquid, reduces pollutant treatment cost, and realizes resource recovery, practices thrift flue gas denitration stage material consumption.

Description

Leachate treatment system for waste incineration power plant
Technical Field
The utility model belongs to the waste water treatment field, specifically speaking relate to a waste incineration power plant leachate treatment system.
Background
The garbage leachate is high-concentration organic wastewater generated in a solid waste treatment project, wherein the leachate of a domestic garbage incineration plant is wastewater collected by seeping from a garbage storage pit in the domestic garbage incineration plant, and has the characteristics of high pollutant concentration, high water quality and water quantity fluctuation, high hardness, high alkalinity and the like. Common COD in waste incineration plantsCrThe concentrations of ammonia nitrogen, TN and SS are 40000-70000mg/L, 1200-2500mg/L, 1300-3000mg/L and 3000-10000mg/L respectively, and the pH value is generally acidic.
At present, the leachate treatment of a domestic garbage incineration plant basically needs to reach the zero discharge standard, the standard reaching water is used as the make-up water of an open cooling circulating water system, the main process is 'anaerobic + two-stage nitrification and denitrification + ultrafiltration + membrane advanced treatment', firstly, denitrification and degradation are carried out through the anaerobic and two-stage nitrification and denitrification processes, biochemical COD is degraded, then, mud and water separation is realized through the ultrafiltration process, the intercepted sludge flows back to the nitrification and denitrification system, the sludge concentration in the system is maintained, and the obtained clear liquid enters a rear-end membrane advanced treatment device for treatment, the COD and metal ions are intercepted, and the final clear liquid is obtained and discharged after reaching the standard. The process is mature, the operation is stable, the effluent quality can stably reach the standard, but the process can generate 25 to 40 percent of concentrated solution, and the concentrated solution generated by advanced treatment is synergistically consumed in modes of lime pulping, fly ash sequestration, furnace entry and back spray and the like; however, the large yield of the concentrated solution is difficult to synergistically dissolve, and as for the concentrated solution evaporation process, the investment of an evaporation system is large, the operation cost is high, and the method is economically infeasible. In addition, because the aerobic system needs to supply a large amount of oxygen for microorganisms to remove organic pollutants and ammonia nitrogen, the aerobic system has high energy consumption and high operation cost.
Therefore, the prior art is subject to further improvement and development.
Disclosure of Invention
In order to solve the above problems, a leachate treatment system for a waste incineration power plant is proposed.
The utility model provides a following technical scheme:
the utility model provides a refuse incineration power plant leachate treatment system, wherein, includes equalizing basin, anaerobism device, the anaerobism water production jar that connects gradually through the pipeline, AMBR membrane device, membrane advanced treatment unit and produce the pond, the system still includes sludge impoundment and concentrate collecting pit, anaerobism device and AMBR membrane device are respectively through pipe connection sludge impoundment, membrane advanced treatment unit passes through pipe connection concentrate collecting pit.
The utility model provides a waste incineration power plant leachate treatment system, wherein, the system still includes marsh gas collection device, anaerobism device passes through pipe connection marsh gas collection device, marsh gas collection device passes through fan and power plant incinerator marsh gas combustor intercommunication.
The utility model provides a refuse incineration power plant leachate treatment system, wherein, the system still includes sludge dewatering device and clear solution pond, sludge impoundment, sludge dewatering device and clear solution pond connect gradually through the pipeline, and sludge dewatering device is through the pipe connection power plant refuse incineration workshop that is provided with the sludge pump, clear solution pond and anaerobic apparatus pass through the pipeline intercommunication.
The utility model provides a waste incineration power plant filtration liquid processing system, wherein, AMBR membrane device is external tubular ultrafiltration device or submergence formula ultrafiltration device, external tubular ultrafiltration device adopts the PVDF membrane as external tubular ultrafiltration membrane, and external tubular ultrafiltration device's design flux is not higher than 50LMH, submergence formula ultrafiltration device adopts the PTFE membrane as submergence formula ultrafiltration membrane, and submergence formula ultrafiltration device's design flux is not higher than 10 LMH.
The utility model provides a waste incineration power plant filtration liquid processing system, wherein, membrane advanced treatment unit passes through pipe connection power plant cooling circulation pond, and membrane advanced treatment unit is reverse osmosis unit or positive osmotic device, reverse osmosis unit is the two-stage DTRO device, positive infiltration is the MBC device.
A leachate treatment system of a waste incineration power plant is disclosed, wherein a DTRO membrane selected in a two-stage DTRO device has a rejection rate of monovalent salt of not less than 95% at 25 ℃, wherein the design flux of a primary DTRO is 8-15LMH, and the design recovery rate is 75-80%; the design flux of the secondary DTRO is 25-35LMH, and the recovery rate is not lower than 90%;
the removal rate of ammonia nitrogen of a forward osmosis membrane selected in the MBC device is not lower than 95% at 25 ℃, and the TDS of a concentrated solution is not lower than 100000 mg/L.
The utility model provides a waste incineration power plant filtration liquid processing system, wherein, the concentrate collecting pit passes through pipe connection denitration reductant atomizing injection apparatus, denitration reductant atomizing injection apparatus corresponds the power plant and burns burning furnace setting, and the injection position sets up in overgrate air supply mouth top, and wherein, the concentrate ammonia nitrogen concentration that the concentrate collecting pit was collected reaches 8000mg/L-25000 mg/L.
The utility model provides a waste incineration power plant filtration liquid processing system, wherein, sludge dewatering device is one of screw extrusion hydroextractor, centrifugal dehydrator, pile spiral shell machine.
Advantageous effects
The utility model discloses waste incineration power plant filtration liquid processing system to domestic waste incineration power plant filtration liquid, full, zero release are handled, and it is big to have solved the output of current technology concentrate, and the problem that pressure is high is absorbed, and simultaneously, this processing apparatus and processing method still have following advantage:
1. an aerobic system is cancelled, the process flow is shortened, and the operation management difficulty is reduced;
2. the aerobic system is cancelled, so that related equipment is reduced, equipment investment, operation energy consumption, operation material consumption, process floor area and the like are greatly reduced, and investment and operation cost are saved;
3. the utility model discloses denitration reductant is done to ammonia nitrogen in the filtration liquid through concentrated enrichment retrieval and utilization back, reduces pollutant treatment cost, and realizes resource recovery, practices thrift flue gas denitration stage material consumption.
Drawings
FIG. 1 is a process flow diagram of a leachate treatment system of a waste incineration power plant according to an embodiment of the present invention.
In the figure: 110-regulating tank, 120-anaerobic device, 130-anaerobic water producing tank, 140-AMBR membrane device, 151-two-stage DTRO device, 152-MBC device, 160-water producing tank, 170-biogas collecting device, 180-sludge tank, 190-sludge dewatering device, 200-clear liquid tank, 210-concentrated liquid collecting tank and 220-denitration reducing agent atomization spraying device.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following description, together with the drawings of the present invention, clearly and completely describes the technical solution of the present invention, and based on the embodiments in the present application, other similar embodiments obtained by those skilled in the art without creative efforts shall all belong to 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 illustration and not for limitation of the present invention.
A leachate treatment system of a waste incineration power plant is shown in figure 1 and comprises a regulating tank 110, an anaerobic device 120, an anaerobic water production tank 130, an AMBR membrane device 140, a membrane advanced treatment device and a water production tank 160 which are sequentially connected through pipelines.
Specifically, the system further comprises a sludge tank 180 and a concentrated solution collecting tank 210, the anaerobic device 120 and the AMBR membrane device 140 are respectively connected with the sludge tank 180 through pipelines, and the membrane advanced treatment device is connected with the concentrated solution collecting tank 210 through a pipeline.
Specifically, the concentrated solution collecting tank 210 is connected with the denitration reducing agent atomization and injection device 220 through a pipeline, the denitration reducing agent atomization and injection device 220 is arranged corresponding to the power plant incinerator, the injection position is arranged above the secondary air supply opening, and the concentrated solution is sprayed back into the incinerator, injection equipment is saved, and project investment is saved. Wherein, the ammonia nitrogen concentration of the concentrated solution collected by the concentrated solution collecting tank 210 reaches 8000mg/L-25000mg/L, and the concentrated solution can be used as a denitration reducing agent of SNCR in a flue gas treatment system. The concentrated solution is used as an SNCR denitration reducing agent, so that the recycling benefit of domestic waste treatment is improved while the final treatment of the concentrated solution is realized, the economic benefit brought by the concentrated solution treatment is greater than the cost caused by the final treatment of the concentrated solution, and certain economic benefit is realized.
Specifically, the system further comprises a biogas collection device 170, the anaerobic device 120 is connected with the biogas collection device 170 through a pipeline, and the biogas collection device 170 is communicated with a power plant incinerator biogas burner through a fan.
Specifically, the system still includes sludge dewatering device 190 and clear liquid pond 200, sludge pond 180, sludge dewatering device 190 and clear liquid pond 200 connect gradually through the pipeline, and sludge dewatering device 190 is through the pipe connection power plant msw incineration workshop that is provided with the sludge pump, the health of being convenient for operate. The clear liquid after the sludge dehydration is lifted to the anaerobic device 120 through the pump, so that the one-time lifting is reduced, the operation energy consumption is reduced, the dehydrated sludge is conveyed to the garbage hopper through the pump to be incinerated, the operation condition is sanitary, and the efficiency is high.
Specifically, the clear liquid tank 200 is communicated with the anaerobic device 120 through a pipeline, the membrane advanced treatment device is connected with a cooling circulating water tank of a power plant through a pipeline, the membrane advanced treatment device is a reverse osmosis device or a forward osmosis device, the reverse osmosis device is a two-stage DTRO device 151, and the forward osmosis device is an MBC device 152. And the two-stage DTRO device 151 or the MBC device 152 are both provided with a membrane cleaning device, a newly-added methane collecting device 170 and a dehydrated clear liquid pool 200.
Compare and get into follow-up unit through the overflow and appear running mud problem after traditional anaerobism device 120 goes out water, the utility model discloses go out water to the anaerobism and adopt MBR to separate, can thoroughly solve the anaerobism and run mud problem, be favorable to improving anaerobism device 120's treatment effeciency, make the quality of water of anaerobism play water better simultaneously. Compare in prior art MBR membrane biological unit, belong to good oxygen system, equipment increase, operation material consumption scheduling problem, the utility model discloses a technology innovation, cancellation good oxygen system has reduced relevant equipment, and equipment investment, operation energy consumption, operation material consumption, technology area etc. all have great reduction, have practiced thrift investment and operation cost.
Specifically, the AMBR membrane device 140 is an external tubular ultrafiltration device or an immersed ultrafiltration device, the external tubular ultrafiltration device uses a PVDF membrane as an external tubular ultrafiltration membrane, the design flux of the external tubular ultrafiltration device is not higher than 50LMH, the immersed ultrafiltration device uses a PTFE membrane as an immersed ultrafiltration membrane, and the design flux of the immersed ultrafiltration device is not higher than 10 LMH; the AMBR membrane device 140 can run safely and stably under the condition that the concentration of organic matters is up to 10000mg/L, AMBR can meet the separation requirements of anaerobic system sludge on high viscosity and difficult separation, the removal rate of SS by the AMBR membrane device 140 can reach more than 95%, and the removal rate of organic matters reaches more than 20%.
Preferably, the rejection rate of the selected DTRO membrane in the two-stage DTRO device 151 to monovalent salt is not lower than 95% at 25 ℃, wherein the design flux of the first-stage DTRO is 8-15LMH, and the design recovery rate is 75% -80%; the design flux of the secondary DTRO is 25-35LMH, and the recovery rate is not lower than 90%; the two-stage DTRO process not only adopts the separation function of the RO device, but also focuses more on the concentration and enrichment function of the RO membrane on ammonia nitrogen in the percolate, and increases the ammonia nitrogen concentration in the concentrated solution. Except that adopting RO to carry out the concentrate still can adopt the MBC concentrate, the concentrate efficiency of MBC is higher, reduces the output of concentrate, promotes the ammonia nitrogen concentration in the concentrate and concentrate added value. For the concentrate after aerobic system handles among the prior art, its main pollutant is organic matter and salinity, the utility model discloses well concentrate does not have through nitrifying, denitrification treatment, except containing organic matter and salinity in the concentrate, the ammonia nitrogen that exists in the filtration liquid is equivalent to concentration 1% -3% aqueous ammonia after passing through the concentrated enrichment of membrane, can regard as SNCR denitration reductant to use, and changing waste into valuables realizes the wastes material resourceization.
Preferably, the forward osmosis membrane selected in the MBC device 152 has a removal rate of ammonia nitrogen of not less than 95% and a TDS of the concentrate of not less than 100000mg/L at 25 ℃.
Preferably, the sludge dewatering device 190 is one of a screw extrusion dewaterer, a centrifugal dewaterer and a screw stacking machine.
Preferably, the anaerobic device 120 is an efficient anaerobic device 120 such as UASB or IC, and the removal rate of the COD organic matter by the anaerobic device 120 is not less than 85%. The anaerobic water production tank 130 serves as a water inlet tank for the buffering and AMBR membrane device 140, enhancing the buffering capacity between systems.
The technical effects of the present invention are further explained below with reference to specific embodiments:
adopt the utility model discloses waste incineration power plant filtration liquid processing system handles the filtration liquid of certain domestic waste incineration plant, and this domestic waste incineration plant filtration liquid quality of water CODCrThe concentrations of ammonia nitrogen, TN and SS are 40000-70000mg/L, 1500-2000mg/L, 1700-2500mg/L and 3000-10000mg/L respectively, and the water quality of the outlet water is designed as follows: COD is 60mg/L, ammonia nitrogen is 10mg/L, SS is 30mg/L, and chloride ion concentration is 250 mg/L.
Through the utility model provides a waste incineration power plant filtration liquid processing system handles the back to this domestic waste incineration plant's filtration liquid, and the product water COD of second grade DTRO/MBC device 152CrThe ammonia nitrogen and the chloride ions respectively reach 10-40mg/L, 0.1-5mg/L and 50-200mg/L, and meet the recycling standard.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention, i.e. the present invention is intended to cover all equivalent variations and modifications within the scope of the present invention.

Claims (8)

1. The utility model provides a refuse incineration power plant leachate treatment system, its characterized in that includes equalizing basin, anaerobism device, the anaerobism water tank of producing that connects gradually through the pipeline, AMBR membrane device, membrane advanced treatment unit and produce the pond, the system still includes sludge impoundment and concentrate collecting pit, anaerobism device and AMBR membrane device are respectively through pipe connection sludge impoundment, membrane advanced treatment unit passes through pipe connection concentrate collecting pit.
2. The leachate treatment system of a waste incineration power plant of claim 1, further comprising a biogas collection device, wherein the anaerobic device is connected to the biogas collection device through a pipeline, and the biogas collection device is communicated with the power plant incinerator biogas burner through a fan.
3. The leachate treatment system of a waste incineration power plant according to claim 1, further comprising a sludge dewatering device and a clear liquid tank, wherein the sludge tank, the sludge dewatering device and the clear liquid tank are sequentially connected through a pipeline, the sludge dewatering device is connected with a waste incineration plant of the power plant through a pipeline provided with a sludge pump, and the clear liquid tank is communicated with the anaerobic device through a pipeline.
4. The leachate treatment system of the waste incineration power plant of claim 1, wherein the AMBR membrane device is an external tubular ultrafiltration device or an immersed ultrafiltration device, the external tubular ultrafiltration device employs a PVDF membrane as the external tubular ultrafiltration membrane, the design flux of the external tubular ultrafiltration device is not higher than 50LMH, the immersed ultrafiltration device employs a PTFE membrane as the immersed ultrafiltration membrane, and the design flux of the immersed ultrafiltration device is not higher than 10 LMH.
5. The leachate treatment system of a refuse incineration power plant according to claim 1, wherein the membrane advanced treatment unit is connected to the cooling circulation water tank of the power plant through a pipeline, the membrane advanced treatment unit is a reverse osmosis unit or a forward osmosis unit, the reverse osmosis unit is a two-stage DTRO unit, and the forward osmosis unit is an MBC unit.
6. The leachate treatment system of the waste incineration power plant of claim 5, wherein the DTRO membrane selected in the two-stage DTRO device has a rejection rate of monovalent salt of not less than 95% at 25 ℃, wherein the design flux of the primary DTRO is 8-15LMH, and the design recovery rate is 75-80%; the design flux of the secondary DTRO is 25-35LMH, and the recovery rate is not lower than 90%;
the removal rate of ammonia nitrogen of a forward osmosis membrane selected in the MBC device is not lower than 95% at 25 ℃, and the TDS of a concentrated solution is not lower than 100000 mg/L.
7. The leachate treatment system of a waste incineration power plant according to claim 1, wherein the concentrated solution collecting tank is connected with a denitration reducing agent atomization injection device through a pipeline, the denitration reducing agent atomization injection device is arranged corresponding to the power plant incinerator, and the injection position is arranged above a secondary air supply port, wherein the concentration of ammonia nitrogen in the concentrated solution collected by the concentrated solution collecting tank reaches 8000mg/L-25000 mg/L.
8. The leachate treatment system of a waste incineration power plant according to claim 3, wherein the sludge dewatering device is one of a screw extrusion dewaterer, a centrifugal dewaterer and a screw stacking machine.
CN202020101305.2U 2020-01-16 2020-01-16 Leachate treatment system for waste incineration power plant Active CN211712895U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112591984A (en) * 2020-11-24 2021-04-02 南京万德斯环保科技股份有限公司 Zero-discharge treatment method and system for landfill leachate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112591984A (en) * 2020-11-24 2021-04-02 南京万德斯环保科技股份有限公司 Zero-discharge treatment method and system for landfill leachate

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