CN208265976U - A kind of landfill leachate concentration liquid zero-discharge treatment system - Google Patents

A kind of landfill leachate concentration liquid zero-discharge treatment system Download PDF

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CN208265976U
CN208265976U CN201820494868.5U CN201820494868U CN208265976U CN 208265976 U CN208265976 U CN 208265976U CN 201820494868 U CN201820494868 U CN 201820494868U CN 208265976 U CN208265976 U CN 208265976U
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landfill leachate
pond
water
advanced oxidation
tank
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刘伟
王俊华
马宁宁
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Guangzhou Hua Hao Energy Environmental Protection Group Ltd By Share Ltd
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Guangzhou Hua Hao Energy Environmental Protection Group Ltd By Share Ltd
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Abstract

The utility model discloses a kind of landfill leachates, and liquid zero-discharge treatment system is concentrated, the system comprises pretreatment systems, conditioning tank, anaerobic system, MBR system, nanofiltration membrane system and the advanced oxidation desalination conjugated system that liquid is concentrated for handling landfill leachate, the pretreatment system, conditioning tank, anaerobic system, MBR system and nanofiltration membrane system are sequentially connected the landfill leachate treatment subsystem constituted for handling landfill leachate, the concentrate discharge outlet of the nanofiltration membrane system is connect with the advanced oxidation desalination conjugated system, the landfill leachate concentration liquid that nanofiltration membrane system generates is entered into advanced oxidation desalination conjugated system and carries out oxidation desalting processing, the advanced oxidation desalination conjugated system includes passing through the sequentially connected advanced oxidation reaction tank of pipeline, pH adjusts back pond, desalination reaction pond and sedimentation basin, it is described heavy Shallow lake pond top is equipped with water outlet, which is connect by pipeline with conditioning tank, the supernatant of sedimentation basin is back to conditioning tank, subsequent processing is mixed and carried out with landfill leachate in pond, realizes that liquid zero-emission is concentrated in landfill leachate.

Description

A kind of landfill leachate concentration liquid zero-discharge treatment system
Technical field
The utility model relates to garbage percolation liquid treating system, in particular at a kind of landfill leachate concentration liquid zero-emission Reason system.Utility model
Background technique
As China requires to be increasingly stringenter to the discharge limitation of landfill leachate, in traditional sense based on biochemical treatment Technique be unable to satisfy discharge standard requirement, using membrane technology as " biochemical treatment+embrane method advanced treating " group technology of core Gradually become the prevailing technology of percolate processing.Wherein, embrane method advanced treatment process generates the film concentrate of about 15%-30%, Compared to former percolate, salinity and pollutant concentration are higher in concentrate, if cannot deal carefully with and be directly discharged to meeting in environment Cause serious secondary pollution.
Currently, typical landfill leachate concentration liquid processing method has: recirculation process, evaporation technology and advanced oxidation skill Art.Wherein recirculation process method is simple, but recharge needs power to be promoted, and long-term recharge will lead to organic matter and dissolubility salt is continuous It increases, influences biochemical treatment unit, cause film fouling serious, influence membrane flux, reduce film service life.Evaporation technology processing is dense Contracting liquid has producing water ratio high, and the advantages that taking up little area, precipitate crystal recoverable, but technique energy consumption is high not environmentally, evaporator Costly, vaporising device is easy fouling and is corroded equipment, and pollutant does not obtain removal substantially.High-level oxidation technology has Fenton method, Ozonation, electrochemical process.Ozonation higher cost, but general single high-level oxidation technology can not Steadily by rubbish percolation liquid membrane concentrate processing to qualified discharge range.Therefore research and develop it is a kind of more efficiently it is convenient, low at This processing method is the emphasis that rubbish percolation liquid membrane concentrate is further studied.
Utility model content
In order to solve the above-mentioned problems of the prior art, the utility model aim is to provide a kind of landfill leachate thick Contracting liquid zero-discharge treatment system.Rationally, treatment effeciency is high for system design, is able to achieve film concentrate zero-emission, reduce operation at This, is avoided salt accumulation, applied widely.
Utility model the utility model aim is achieved through the following technical solutions: a kind of landfill leachate concentration liquid zero-emission It puts processing system, including pretreatment system, conditioning tank, anaerobic system, MBR system, nanofiltration membrane system and is seeped for handling rubbish The advanced oxidation desalination conjugated system of filtrate concentrate, the pretreatment system, conditioning tank, anaerobic system, MBR system and nanofiltration Membranous system is sequentially connected the landfill leachate treatment subsystem constituted for handling landfill leachate, the nanofiltration membrane system it is dense Contracting liquid discharge outlet is connect with the advanced oxidation desalination conjugated system, and the landfill leachate concentration liquid that nanofiltration membrane system generates enters Advanced oxidation desalination conjugated system carries out oxidation desalting processing, and the advanced oxidation desalination conjugated system includes passing through pipeline successively The advanced oxidation reaction tank of connection, pH adjust back pond, desalination reaction pond and sedimentation basin, and the sedimentation basin top is equipped with water outlet, should Water outlet is connect by pipeline with conditioning tank, and the supernatant of sedimentation basin is back to conditioning tank and is mixed simultaneously with landfill leachate in pond Subsequent processing is carried out, realizes that liquid zero-emission is concentrated in landfill leachate.
The utility model include mainly by pretreatment system, conditioning tank, anaerobic system, MBR system and nanofiltration membrane system according to The secondary landfill leachate treatment subsystem connected and composed and the advanced oxidation desalination conjugated system that liquid is concentrated for landfill leachate System is provided simultaneously with landfill leachate and landfill leachate concentration liquid processing capacity.Landfill leachate is by landfill leachate After the processing for managing subsystem, water outlet can qualified discharge, it is total that the landfill leachate concentration liquid of generation then enters advanced oxidation desalination Yoke system carries out oxidative degradation and desalting processing, the water outlet of the less salt low pollution object content of acquisition be back in conditioning tank again with Landfill leachate merging treatment in pond realizes the zero-emission of landfill leachate concentration liquid during landfill leachate treatment.
COD of waste leachate and salt content are high, and therefore, anaerobic system described in the utility model is preferably MS anaerobism system System has methanogen (MPB) and sulfate reducing bacteria (SRB) dominant microflora through culture domestication that is, in the system.The MS anaerobism System includes MS anaerobic reactor and reflux unit, MS anaerobic reactor top be equipped with exhaust outlet, water outlet and with reflux The refluxing opening of device connection, inside set gradually water distributor from bottom to up, containing methanogen (MPB) and sulfate reducing bacteria (SRB) packing layer and three phase separator of the granule sludge layer of dominant microflora, biomembrane with above-mentioned dominant microflora, rubbish seep Filtrate successively passes through granule sludge layer and packing layer through water distributor water distribution, then makes water and gas and solid by three phase separator Separation, gas are discharged from exhaust outlet, and solids backflow packing layer, water is then discharged into MBR system from water outlet;The reflux unit Including reflux pump, the water inlet of reflux pump is connect with MS anaerobic reactor refluxing opening, and water outlet then connects with water distributor water inlet Connect, by effluent recycling MS anaerobic reactor, to control the organic loading in water upflow velocity and reaction tank, on the one hand make be System initial start stage, which builds to cultivate in MS anaerobic reactor, tames methanogen (MPB) and sulfate reducing bacteria (SRB) The good dominant microflora methanogen (MPB) of symbiosis and sulfate reducing bacteria (SRB) are tamed out in environment, culture, for height The pollutants such as COD and sulfate in effect removal landfill leachate, on the other hand landfill leachate can in system operation It is come into full contact in MS anaerobic reactor endoparticle sludge blanket and packing layer, is eliminated as much as COD and sulfate in landfill leachate Equal pollutants.
The advanced oxidation desalination conjugated system further includes medicament addition device, for launching into advanced oxidation reaction tank Soften medicament, softens with high salt, high rigidity landfill leachate in pond and liquid, oxidative degradation pollutant and desalination is concentrated.
The MBR system uses external, including passes through pipeline and the sequentially connected biochemical reaction tank of water pump and ultrafiltration dress It sets, wherein biochemical reaction tank includes sequentially connected level-one denitrification pond, level-one nitrification tank, second level denitrification pond and second level nitrification Pond, landfill leachate carry out biological denitrificaion and degradation COD in biochemical reaction tankCr, COD removal rate reaches 96% or more, and ammonia nitrogen is gone Except rate reaches 99% or more, the nitrification liquid after reaction is separated by solid-liquid separation using ultrafiltration apparatus, and last ultrafiltration clear liquid, which enters, to be received Filter membrane (NF) system further removes remaining organic pollutant in water removal, and COD removal rate reaches 90% or more, it is ensured that water outlet reaches Mark.Biochemical reaction tank in the present invention is preposition using denitrification, the form of postposition is nitrified, according to amount of inlet water and water quality The reaction condition that condition, configuration and control are suitable for realizes biological denitrificaion and degradation to realize efficient denitrification and nitration reaction Organic pollutant.
In the utility model, diving mixer is set in level-one denitrification pond and second level denitrification pond, is used for pond The DO concentration of middle water is controlled in 0.5mg/L;Jet aerator is set in the level-one nitrification tank and second level nitrification tank, is used for pond The DO concentration of middle water is controlled in 2-5mg/L.
The nanofiltration membrane system can only include nano filter membrance device, the water outlet of the influent side of nano filter membrance device and advanced oxygen Landfill leachate concentration liquid is sent into advanced oxidation desalination and is total to by the advanced oxidation reaction tank water inlet connection for changing desalination conjugated system Yoke system carries out oxidation desalting processing.Nanofiltration concentrate storage further can also be added on the basis of nano filter membrance device The water outlet of the influent side of pond, water inlet and nano filter membrance device connects, water outlet and advanced oxidation desalination conjugated system The connection of advanced oxidation reaction device water inlet, the landfill leachate concentration liquid of nano filter membrance device discharge is first in nanofiltration concentrate storage pool Storage, is re-fed into advanced oxidation desalination conjugated system and is handled, alleviate advanced oxidation desalination conjugated system processing pressure, make Water process can be carried out continuously.
In the utility model, the nanofiltration membrane component that the nano filter membrance device uses is tubular membrane, membrane flux 15-25L/m2· H, producing water ratio 80-90%.
The pretreatment system includes sequentially connected grid pond and coagulative precipitation tank, and hydraulic screen is arranged in grid pond, For removing biggish particles float object in landfill leachate, the water outlet of coagulative precipitation tank and the water inlet of conditioning tank are connected, Landfill leachate from grid pond dosing coagulation in coagulative precipitation tank, remove landfill leachate in SS and metal ion with And coarse suspended matter, reduce deposition and blocking subsequent pipeline and water pump etc. of the suspended matter in conditioning tank.
Stirring in slurry device is set in the conditioning tank, carries out water quality, runoff investigation for stirring landfill leachate.It is described The volume of conditioning tank can be such that landfill leachate effective stay time is greater than 7 days.
Water pump and filter be set between the conditioning tank and anaerobic reation pool, it is quenched after landfill leachate by filtering After enter back into anaerobic reation pool, reduce sludge quantity in anaerobic reation pool, promote treatment effect.A reality as the utility model Example is applied, the filter is basket filter.
The utility model further includes sludge treating system, the sludge import of the sludge treating system and the level-one of MBR system Denitrification pond, level-one nitrification tank, second level denitrification pond, second level nitrification tank are connected with the mud discharging mouth of ultrafiltration apparatus, sludge into Enter sludge treating system be concentrated, be quenched, dehydration, being stablized, the minimizings processing such as desiccation or burning, the sludge treating system Discharge outlet connect with conditioning tank, the waste water of sludge removing flow to percolate merging treatment in conditioning tank and pond.At the sludge Reason system uses existing sludge treatment device.
The utility model has the advantage that
(1) the utility model includes mainly by pretreatment system, conditioning tank, anaerobic system, MBR system and nanofiltration membrane system It is sequentially connected the landfill leachate treatment subsystem of composition and the advanced oxidation desalination conjugation for landfill leachate concentration liquid System is provided simultaneously with landfill leachate and landfill leachate concentration liquid processing capacity.With landfill leachate treatment subsystem into Row landfill leachate treatment is at the rubbish percolation liquid membrane concentrate that main body technology cooperates with advanced oxidation desalination conjugated system to carry out Science and engineering skill, realization concentrate zero-emission, technical feasibility, operating cost are lower.
(2) MS anaerobic system setting water distributor, packing layer, three phase separator and reflux unit in the utility model, pass through Reflux unit controls organic loading and water upflow velocity, ensure that the system acts on the efficient removal of the COD of landfill leachate.
(3) MS anaerobic system can turn out the good dominant microflora methanogen of symbiosis in the utility model (MPB) pollutants such as COD and sulfate can be efficiently removed, are had under the action of MPB and SRB with sulfate reducing bacteria (SRB) Effect reduces salt accumulation problem in permeated liquid system, has a vast market foreground.
(4) the utility model operational effect is good, and for salinity without obvious accumulation, operating cost is lower.
(5) liquid zero-discharge treatment system is concentrated in landfill leachate provided by the utility model, for handling landfill leachate And liquid is concentrated in landfill leachate, not only macromolecular hardly degraded organic substance effectively in degradation concentrate, also effectively reduces in concentrate The accumulation of salinity, so that solving concentrate handles existing secondary pollution, salt accumulation, operating cost height, the high disadvantage of investment End, effectively reduces operating cost, has the broader market advantage.
Detailed description of the invention
The utility model is described in further detail with reference to the accompanying drawing.
Fig. 1 is the landfill leachate concentration liquid zero-discharge treatment system structural schematic diagram of the utility model embodiment 1.
Fig. 2 is the process flow diagram of the landfill leachate concentration liquid zero-discharge treatment system of the utility model.
Fig. 3 is the process flow diagram of the advanced oxidation desalination conjugated system of the utility model.
Specific embodiment
Embodiment 1
Landfill leachate concentration liquid zero-discharge treatment system shown in FIG. 1 is one embodiment of the utility model, including Pretreatment system, conditioning tank 3, MS anaerobic system, MBR system, nanofiltration membrane system, sludge treating system and for handle rubbish seep The advanced oxidation desalination conjugated system of filtrate concentrate.Pretreatment system, conditioning tank 3, MS anaerobic system, MBR system and nanofiltration Membranous system is sequentially connected the landfill leachate treatment subsystem constituted for handling landfill leachate, the concentrate of nanofiltration membrane system Discharge outlet is connect with advanced oxidation desalination conjugated system, and the landfill leachate concentration liquid that nanofiltration membrane system is generated is sent into advanced oxygen Change desalination conjugated system and carry out oxidation desalting processing, the discharge outlet of advanced oxidation desalination conjugated system passes through pipeline and conditioning tank 3 Water inlet connection.
Pretreatment system includes sequentially connected grid pond 1 and coagulative precipitation tank 2, and hydraulic screen is arranged in grid pond 1, is used for Remove biggish particles float object in landfill leachate.The water outlet of coagulative precipitation tank 2 is connect with the water inlet of conditioning tank 3, is come From the landfill leachate of grid pond 1 in coagulative precipitation tank 2 dosing coagulation, remove SS in landfill leachate and metal ion with And coarse suspended matter, reduce deposition and blocking subsequent pipeline and water pump etc. of the suspended matter in conditioning tank 3.
Stirring in slurry device is set in conditioning tank 3, carries out water quality, runoff investigation for stirring landfill leachate.Conditioning tank 3 Volume can make landfill leachate effective stay time be greater than 7 days.Water pump 20 and mistake are set between conditioning tank 3 and MS anaerobic system Filter 19, it is quenched after landfill leachate enter back into MS anaerobic system after filtering, reduce sludge quantity in MS anaerobic system, mention Rise treatment effect.Filter 19 is basket filter in the present embodiment.
There are methanogen (MPB) and sulfate reducing bacteria (SRB) dominant microflora through culture domestication load in MS anaerobic system. MS anaerobic system includes MS anaerobic reactor 4 and reflux unit.4 top of MS anaerobic reactor be equipped with exhaust outlet, water outlet and with The refluxing opening of reflux unit connection, inside set gradually from bottom to up water distributor, containing methanogen (MPB) and sulfate also The packing layer and three phase separator of the granule sludge layer of opportunistic pathogen (SRB) dominant microflora, biomembrane with above-mentioned dominant microflora, rubbish Rubbish percolate successively passes through granule sludge layer and packing layer through water distributor water distribution, then by three phase separator make water and gas and Solid separation, gas from exhaust outlet be discharged, solids backflow packing layer, water can water outlet be discharged into MBR system.Reflux dress Set including reflux pump 18, the water inlet of reflux pump 18 is connect with 4 refluxing opening of MS anaerobic reactor, water outlet then with water distributor into Mouth of a river connection, it is organic in water upflow velocity and MS anaerobic reactor 4 to control by effluent recycling MS anaerobic reactor 4 Load, domestication methanogen (MPB) and sulfuric acid can be cultivated by building system initial start stage in MS anaerobic reactor 4 The good dominant microflora methanogen (MPB) of symbiosis and sulfate reduction are tamed out in the environment of salt reducing bacteria (SRB), culture Bacterium (SRB), efficiently to remove the pollutants such as COD and sulfate in landfill leachate, the on the other hand rubbish in system operation Rubbish percolate can come into full contact in 4 endoparticle sludge blanket of MS anaerobic reactor and packing layer, be eliminated as much as landfill leachate The pollutants such as middle COD and sulfate.
MBR system uses external, including passes through pipeline and the sequentially connected biochemical reaction tank of water pump and ultrafiltration apparatus 9, Wherein biochemical reaction tank includes sequentially connected level-one denitrification pond 5, level-one nitrification tank 6, second level denitrification pond 7 and second level nitrification Pond 8, landfill leachate carry out biological denitrificaion and degradation CODCr in biochemical reaction tank, and COD removal rate reaches 96% or more, ammonia nitrogen Removal rate reaches 99% or more, and the nitrification liquid after reaction is separated by solid-liquid separation using ultrafiltration apparatus, and last ultrafiltration clear liquid enters Nanofiltration membrane (NF) system further removes remaining organic pollutant in water removal, and COD removal rate reaches 90% or more, it is ensured that water outlet reaches Mark.Biochemical reaction tank in the present embodiment is preposition using denitrification, the form of postposition is nitrified, according to amount of inlet water and water quality item The reaction condition that part, configuration and control are suitable for realizes that biological denitrificaion and degradation have to realize efficient denitrification and nitration reaction Machine pollutant.Diving mixer is set in level-one denitrification pond 5 and second level denitrification pond 7, for controlling the DO concentration of water in pond. Jet aerator is set in level-one nitrification tank 6 and second level nitrification tank 8, for controlling the DO concentration of water in pond.
Nanofiltration membrane system includes nano filter membrance device 10 and nanofiltration concentrate storage pool 11.The influent side of nano filter membrance device 10 Water outlet is connect with the water inlet of nanofiltration concentrate storage pool 11, and the water outlet and advanced oxidation of nanofiltration concentrate storage pool 11 are de- 13 water inlet of advanced oxidation reaction tank of salt conjugated system connects, and the landfill leachate concentration liquid that nano filter membrance device 10 discharges first exists Nanofiltration concentrate storage pool 11 stores, and is re-fed into advanced oxidation desalination conjugated system and is handled, alleviates advanced oxidation desalination Conjugated system processing pressure, is carried out continuously water process.The nanofiltration membrane component that nano filter membrance device 10 uses is tubular membrane, film Flux 15-25L/m2H, producing water ratio 80-90%.
Advanced oxidation desalination conjugated system includes passing through the sequentially connected medicament addition device 12 of pipeline, advanced oxidation reaction Pond 13, pH readjustment pond 14, desalination reaction pond 15 and sedimentation basin 16.The water inlet and nanofiltration concentrate of advanced oxidation reaction tank 13 store up The water outlet connection in pond 11 is deposited, the landfill leachate concentration liquid of nanofiltration membrane system discharge enters in advanced oxidation reaction tank 13, medicine Agent throwing device 13 launches softening agent and advanced oxidation agent according to the property of concentrate, carries out softening and oxidative degradation to concentrate Pollutant process.After resulting waste water enters pH readjustment pond 14 readjustment pH after advanced oxidation is handled, into desalination reaction pond Dosing desalination in 15 finally enters sedimentation basin 16 and is precipitated.16 top of sedimentation basin is equipped with water outlet, which passes through pipeline It is connect with conditioning tank 3, the supernatant of sedimentation basin 16 is back to conditioning tank 3 and is mixed with landfill leachate in pond and carries out subsequent place Reason realizes that liquid zero-emission is concentrated in landfill leachate.
The sludge import of sludge treating system 17 and the level-one denitrification pond 5 of MBR system, level-one nitrification tank 6, the anti-nitre of second level Change pond 7, second level nitrification tank 8 to connect with the mud discharging mouth of ultrafiltration apparatus 9, sludge enter sludge treating system 17 be concentrated, The minimizings processing such as quenched, dehydration, stable, desiccation or burning.The discharge outlet of sludge treating system 17 is connect with conditioning tank 3, dirty The waste water of mud removing flow to conditioning tank 3 and mixes with percolate in pond and carry out subsequent processing.Sludge treating system 17 is using existing Sludge treatment device.Fig. 2 and it is shown in Fig. 3 be the present embodiment process flow.
(1) landfill leachate enters pretreatment system through pipeline and is pre-processed.Influent quality are as follows: COD≤50000mg/ L, BOD5≤ 30000mg/L, NH3- N≤1800mg/L, SO4 2-≤1000mg/L.Landfill leachate is introduced into grid pond 1, Chi Zhong Hydraulic screen can remove biggish particles float object in percolate, reduce deposition and blocking of the suspended matter in conditioning tank 3 Subsequent pipeline, water pump etc..The water outlet of grid pond 1 enters coagulative precipitation tank 2, by coagulating kinetics, removes big portion in waste water Divide the pollutants such as suspended matter, sulphion, heavy metal ion, then gravity flow enters conditioning tank 3.3 residence time of conditioning tank is greater than 7d, And under the stirring action of stirring in slurry device, the percolate (concentration to flow back after plant area's percolate and processing in different time periods Liquid) it is mixed in conditioning tank 3, play the role of balanced water to landfill leachate, homogenize water quality.
(2) water outlet is carried out after the filtering of basket filter 19 into MS anaerobic system with the promotion of water pump 20 in conditioning tank 3 Anaerobic Treatment.Water upflow velocity is controlled in 0.6-0.8m/h by reflux unit, organic loading is controlled in 7kgCOD/m3·d Below.MS anaerobic system gathers granule sludge and biomembrane in one under anaerobic environment, and biomass is high, and mass transfer effect is good, bears It is loaded with methanogen (MPB) and sulfate reducing bacteria (SRB) dominant microflora.In water inlet without sulfate in the presence of, the removal master of COD The effect of methanogen is relied on, in the presence of having sulfate in water inlet, the anaerobic degradation approach of organic matter changes, sulfuric acid The reduction of salt needs a certain amount of organic matter as matrix, restores 1mol SO4 2-The COD for needing to consume 2mol, there is SO4 2-In the presence of When, the removal of COD is methanogen and the coefficient result of sulfate reducing bacteria.And methanogen and sulfate reducing bacteria are deposited In substrate competition.By changing influent COD and sulfate concentration in the present embodiment, COD/SO is controlled4 2->=2, turn out symbiosis pass It is that good dominant microflora methanogen (MPB) and sulfate reducing bacteria (SRB) can effectively be gone under the action of MPB and SRB Except the pollutants such as COD and sulfate in landfill leachate, COD removal rate reaches 75% or more, and sulfate removal rate reaches 80% More than, to greatly reduce the processing load of subsequent aerobic biochemical technique and reduce divalent salt accumulation.In filler and three phase separation Under the action of device, realize that water, gas, solid three-phase efficiently separate.
(3) water outlet of MS anaerobic system is filled from progress denitrification and nitrification processing in MBR system is flowed into subsequently into ultrafiltration 9 ultrafiltration are set, ultra-filtration water enters nanofiltration membrane system and carries out nanofiltration processing, the discharge of nanofiltration standard water discharge.MS anaerobism in this step The water outlet of system sequentially enters to be carried out in level-one denitrification pond 5, level-one nitrification tank 6, second level denitrification pond 7 and second level nitrification tank 8 Denitrification and nitration reaction, wherein control DO concentration in anti-nitration reaction twice in 0.5mg/L hereinafter, twice in nitration reaction DO concentration is controlled in 2-5mg/L;Meanwhile the sludge concentration for controlling each denitrification pond and nitrification tank is 15-30g/L, organic sludge Load is 0.05-0.1kgCOD/kgMLSSd, and total nitrogen sludge loading is 0.02-0.05kgTN/kgMLSSd, ultrafiltration membrane Membrane flux controls below 65L/m2 ﹒ h.Percolate carries out biological denitrificaion and degradation CODCr, COD removal rate in biochemical reaction tank Reach 96% or more, ammonia nitrogen removal frank reaches 99% or more, and the nitrification liquid after reaction is consolidated using external ultra-filtration membrane device 9 Liquid separation, last ultrafiltration clear liquid enter nano filter membrance device 10 and further remove remaining organic pollutant in water removal, and COD removal rate reaches To 90% or more, it is ensured that water outlet reaches the second period of Guangdong Province's provincial standard " Sewage Water Emissions limit value " (DB44/26-2001) The requirement of primary standard, COD≤90mg/L, BOD5≤ 20mg/L, NH3-N≤10mg/L。
(4) liquid is concentrated in the nanofiltration concentrate that nanofiltration membrane system generates, i.e. landfill leachate, into advanced oxidation reaction device 13 In, sulfuric acid and -30% hydrogen peroxide of advanced oxidation agent and ferrous sulfate are added, concentrate pH value is 3-4, is degraded in acid condition It is difficult to biodegradable pollutant in concentrate, reduces organic concentration, improves Biodegradability of Wastewater.Advanced oxidation reaction tank Water outlet enters pH readjustment pond 14 and carries out pH readjustment, pulls back to pH8-9 or so, de- by adding subsequently into desalination reaction pond 15 Salt medicament carries out flocculation desalination reaction, and high price salt ion is removed, and water outlet enters sedimentation basin 16 and precipitated, and removes in concentrate A large amount of salinity.
(5) supernatant in sedimentation basin 16 is back to conditioning tank 3 and merges with landfill leachate in pond, continues step (2) to the processing of (4).
(6) by the level-one denitrification pond 5 of MBR system, level-one nitrification tank 6, second level denitrification pond 7, second level nitrification tank 8 and super Sludge in filter device 9 is emitted into sludge treating system 17 through respective mud discharging mouth to be concentrated, is quenched, being dehydrated, is steady The minimizings processing such as fixed, desiccation or burning;Meanwhile the waste water of sludge removing drains into percolate in conditioning tank 3 and pond through discharge outlet Merge, continues the processing of step (2) to (4).
For those skilled in the art, it can make other each according to the above description of the technical scheme and ideas The corresponding change of kind and deformation, and all these changes and deformation all should belong to the guarantor of the utility model claims Within the scope of shield.

Claims (9)

1. liquid zero-discharge treatment system, including pretreatment system, conditioning tank, anaerobic system, MBR system is concentrated in a kind of landfill leachate System and nanofiltration membrane system, characterized in that it further include the advanced oxidation desalination conjugated system for handling landfill leachate concentration liquid, The pretreatment system, conditioning tank, anaerobic system, MBR system and nanofiltration membrane system are sequentially connected composition and seep for handling rubbish The landfill leachate treatment subsystem of filtrate, the concentrate discharge outlet of the nanofiltration membrane system and the advanced oxidation desalination are conjugated System connection, the landfill leachate concentration liquid that nanofiltration membrane system generates is entered advanced oxidation desalination conjugated system, and to carry out oxidation de- Salt treatment, the advanced oxidation desalination conjugated system include by the sequentially connected advanced oxidation reaction tank of pipeline, pH adjust back pond, Desalination reaction pond and sedimentation basin, the sedimentation basin top are equipped with water outlet, which is connect with conditioning tank by pipeline, will be sunk The supernatant in shallow lake pond is back to conditioning tank and subsequent processing is mixed and carried out with landfill leachate in pond, realizes landfill leachate concentration Liquid zero-emission.
2. liquid zero-discharge treatment system is concentrated in landfill leachate according to claim 1, characterized in that the anaerobic system is MS anaerobic system, including MS anaerobic reactor and reflux unit, MS anaerobic reactor top be equipped with water outlet and with reflux The refluxing opening of device connection, inside set gradually water distributor from bottom to up, containing methanogen and sulfate reducing bacteria advantage The packing layer and three phase separator of the granule sludge layer of flora, biomembrane with the dominant microflora;The reflux unit packet Reflux pump is included, water inlet is connect with anaerobic reation pool refluxing opening, and water outlet is then connect with water distributor water inlet, and water is flowed back In anaerobic reation pool, the organic loading in water upflow velocity and reaction tank is controlled.
3. liquid zero-discharge treatment system is concentrated in landfill leachate according to claim 1, characterized in that the MBR system is adopted With external, including by pipeline and the sequentially connected biochemical reaction tank of water pump and ultrafiltration apparatus, wherein biochemical reaction tank includes Sequentially connected level-one denitrification pond, level-one nitrification tank, second level denitrification pond and second level nitrification tank, the water outlet of second level nitrification tank It is connect with the water inlet of ultrafiltration apparatus.
4. liquid zero-discharge treatment system is concentrated in landfill leachate according to claim 1, characterized in that the nanofiltration membrane system Including nano filter membrance device, the advanced oxidation of the water outlet and advanced oxidation desalination conjugated system of the influent side of the nano filter membrance device is anti- It answers pond water inlet to connect, landfill leachate concentration liquid is sent into advanced oxidation desalination conjugated system and carries out oxidation desalting processing.
5. liquid zero-discharge treatment system is concentrated in landfill leachate according to claim 4, characterized in that the nanofiltration membrane system It further include nanofiltration concentrate storage pool, the water outlet of the influent side of water inlet and nano filter membrance device connects, water outlet and high Liquid is concentrated in the advanced oxidation reaction tank water inlet connection of grade oxidation desalination conjugated system, the landfill leachate of nano filter membrance device discharge It is first stored in nanofiltration concentrate storage pool, is re-fed into advanced oxidation desalination conjugated system and is handled, it is de- to alleviate advanced oxidation Salt conjugated system processing pressure, is carried out continuously water process.
6. liquid zero-discharge treatment system is concentrated in landfill leachate according to claim 4 or 5, characterized in that the nanofiltration membrane The nanofiltration membrane component that device uses is tubular membrane, membrane flux 15-25L/m2H, producing water ratio 80-90%.
7. liquid zero-discharge treatment system is concentrated in landfill leachate according to claim 1, characterized in that the pretreatment system System includes sequentially connected grid pond and coagulative precipitation tank, and hydraulic screen is arranged in the grid pond, and the coagulative precipitation tank goes out The connection of the water inlet of the mouth of a river and conditioning tank.
8. liquid zero-discharge treatment system is concentrated in landfill leachate according to claim 1, characterized in that set in the conditioning tank Set stirring in slurry device.
9. liquid zero-discharge treatment system is concentrated in landfill leachate according to claim 1, characterized in that further include Treatment of Sludge System, the sludge import of the sludge treating system and the mud discharging mouth of MBR system connect, the draining of the sludge treating system Mouth is connect with conditioning tank, and the waste water of sludge removing flow to conditioning tank and mixes with percolate in pond and carry out subsequent processing.
CN201820494868.5U 2018-04-09 2018-04-09 A kind of landfill leachate concentration liquid zero-discharge treatment system Active CN208265976U (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN111252967A (en) * 2020-02-24 2020-06-09 鹭滨环保科技(上海)股份有限公司 Treatment system and treatment method for membrane filtration concentrated solution of landfill leachate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111252967A (en) * 2020-02-24 2020-06-09 鹭滨环保科技(上海)股份有限公司 Treatment system and treatment method for membrane filtration concentrated solution of landfill leachate

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