CN108373238A - A kind of landfill leachate concentration liquid zero-discharge treatment system and technique - Google Patents

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

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Publication number
CN108373238A
CN108373238A CN201810312087.4A CN201810312087A CN108373238A CN 108373238 A CN108373238 A CN 108373238A CN 201810312087 A CN201810312087 A CN 201810312087A CN 108373238 A CN108373238 A CN 108373238A
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landfill leachate
pond
water
anaerobic
level
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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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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/442Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281Installations for water purification using chemical agents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/58Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/66Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/72Treatment of water, waste water, or sewage by oxidation
    • C02F1/722Oxidation by peroxides
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2203/00Apparatus and plants for the biological treatment of water, waste water or sewage
    • C02F2203/006Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/08Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00Use of specific compounds during water treatment
    • C02F2305/02Specific form of oxidant
    • C02F2305/026Fenton's reagent
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/302Nitrification and denitrification treatment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/34Biological treatment of water, waste water, or sewage characterised by the microorganisms used

Abstract

The invention discloses a kind of landfill leachate concentration liquid zero-discharge treatment system and techniques,The system comprises pretreatment systems,Regulating reservoir,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,Regulating reservoir,Anaerobic system,MBR system and nanofiltration membrane system are sequentially connected the landfill leachate treatment subsystem constituted for handling landfill leachate,The concentrate floss hole of the nanofiltration membrane system is connect with the advanced oxidation desalination conjugated system,The landfill leachate concentration liquid that nanofiltration membrane system generates enters 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,The sedimentation basin top is equipped with water outlet,The water outlet is connect by pipeline with regulating reservoir,The supernatant of sedimentation basin is back to regulating reservoir to mix with landfill leachate in pond and carry out subsequent processing,Realize that landfill leachate concentrates liquid zero-emission.

Description

A kind of landfill leachate concentration liquid zero-discharge treatment system and technique
Technical field
The present invention relates to garbage percolation liquid treating systems, more particularly to a kind of landfill leachate concentration liquid zero discharge treatment system System.The invention further relates to landfill leachates to concentrate liquid Zero-discharge treating process simultaneously.
Background technology
As China requires to be increasingly stringenter to the discharge limitation of landfill leachate, in traditional sense based on biochemical treatment Technique cannot be satisfied 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 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 can cause organic matter and dissolubility salt 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 methods, Ozonation, electrochemical process.Ozonation cost is higher, but general single high-level oxidation technology can not Steadily by rubbish percolation liquid membrane concentrate processing to qualified discharge range.Therefore research and development 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.
Invention content
In order to solve the above-mentioned problems of the prior art, it is an object of the present invention to provide a kind of landfill leachate thicks Contracting liquid zero-discharge treatment system.The system reasonable design, treatment effeciency are high, can realize film concentrate zero-emission, reduce operation at This, is avoided salt accumulation, applied widely.
The second purpose of the present invention is to provide a kind of landfill leachates to concentrate liquid Zero-discharge treating process.
One of the object of the invention is achieved through the following technical solutions:A kind of landfill leachate concentration liquid zero discharge treatment system System, including pretreatment system, regulating reservoir, anaerobic system, MBR system, nanofiltration membrane system and for handle landfill leachate concentration The advanced oxidation desalination conjugated system of liquid, the pretreatment system, regulating reservoir, anaerobic system, MBR system and nanofiltration membrane system according to The secondary landfill leachate treatment subsystem connected and composed for handling landfill leachate, the concentrate discharge of the nanofiltration membrane system Mouth 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 the sequentially connected height of pipeline Grade oxidation reaction pond, pH readjustments pond, desalination reaction pond and sedimentation basin, the sedimentation basin top are equipped with water outlet, and the water outlet is logical Piping is connect with regulating reservoir, and the supernatant of sedimentation basin, which is back to regulating reservoir, to be mixed with landfill leachate in pond and carry out follow-up Processing realizes that landfill leachate concentrates liquid zero-emission.
The present invention includes mainly being connected successively by pretreatment system, regulating reservoir, anaerobic system, MBR system and nanofiltration membrane system It connects the landfill leachate treatment subsystem of composition and concentrates the advanced oxidation desalination conjugated system of liquid for landfill leachate, together When have landfill leachate and landfill leachate concentration liquid processing capacity.Landfill leachate passes through landfill leachate treatment subsystem After the processing of system, water outlet can qualified discharge, generation landfill leachate concentration liquid then enter advanced oxidation desalination conjugated system Carry out oxidative degradation and desalting processing, the water outlet of the less salt low stain object content of acquisition be back to again in regulating reservoir in pond Landfill leachate merging treatment 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 of the present invention is preferably MS anaerobic systems, i.e., There are methanogen (MPB) and sulfate reducing bacteria (SRB) dominant microflora through culture domestication in the system.The MS anaerobic systems packet MS anaerobic reactors and reflux are included, MS anaerobic reactors top is equipped with exhaust outlet, water outlet and connects with reflux The refluxing opening connect, inside set gradually from bottom to up water distributor, contain methanogen (MPB) and sulfate reducing bacteria (SRB) The packing layer and three phase separator of the granule sludge layer of dominant microflora, the biomembrane with above-mentioned dominant microflora, landfill leachate Pass through granule sludge layer and packing layer successively through water distributor water distribution, then passing through three phase separator makes water and gas and solid point From gas is discharged from exhaust outlet, and solids backflow packing layer, water is then discharged into MBR system from water outlet;The reflux packet Reflux pump is included, the water inlet of reflux pump is connect with MS anaerobic reactor refluxing openings, and water outlet is then connect with water distributor water inlet, By in effluent recycling MS anaerobic reactors, to control the organic loading in water upflow velocity and reaction tank, on the one hand make system Initial start stage builds the ring that can cultivate domestication methanogen (MPB) and sulfate reducing bacteria (SRB) in MS anaerobic reactors The good dominant microflora methanogen (MPB) of symbiosis and sulfate reducing bacteria (SRB) are tamed out in border, culture, for efficient The pollutants such as COD and sulfate in landfill leachate are removed, on the other hand landfill leachate can be in system operation MS anaerobic reactor endoparticle sludge blankets and packing layer come into full contact with, and are eliminated as much as COD and sulfate etc. in landfill leachate Pollutant.
The advanced oxidation desalination conjugated system further includes medicament addition device, for being launched into advanced oxidation reaction tank Soften medicament, softens with high salt, high rigidity landfill leachate in pond and concentrate liquid, oxidative degradation pollutant and desalination.
The MBR system uses external, including is filled by pipeline and the sequentially connected biochemical reaction tank of water pump and ultrafiltration It sets, wherein biochemical reaction tank includes sequentially connected level-one denitrification pond, level-one nitrification tank, two level denitrification pond and two level nitrification Pond, landfill leachate carry out biological denitrificaion and degradation COD in biochemical reaction tankCr, COD removal rates reach 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 goes remaining organic pollution in water removal, COD removal rates to reach 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 item Part configures and controls suitable reaction condition to realize efficient denitrification and nitration reaction, realizes that biological denitrificaion and degradation have Machine pollutant.
In the present invention, diving mixer is set in level-one denitrification pond and two level denitrification pond, is used for Chi Zhongshui DO concentration control in 0.5mg/L;Jet aerator is set in the level-one nitrification tank and two level nitrification tank, is used for Chi Zhongshui DO concentration control 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.Can also nanofiltration concentrate storage be further 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 Advanced oxidation reactor water inlet connects, and 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 present invention, the nanofiltration membrane component that the nano filter membrance device uses is tubular membrane, membrane flux 15-25L/m2H, production Water rate is 80-90%.
The pretreatment system includes sequentially connected grid pond and coagulative precipitation tank, and hydraulic screen is arranged in grid pond, For removing particles float object larger in landfill leachate, the water outlet of coagulative precipitation tank and the water inlet of regulating reservoir connect, 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 regulating reservoir.
Stirring in slurry device is set in the regulating reservoir, water quality, runoff investigation are carried out for stirring landfill leachate.It is described The volume of regulating reservoir can be such that landfill leachate effective stay time is more than 7 days.
Water pump and filter be set between the regulating reservoir 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.An implementation as the present invention Example, the filter are basket filter.
The invention also includes sludge treating system, the anti-nitre of level-one of the sludge import and MBR system of the sludge treating system Change pond, level-one nitrification tank, two level denitrification pond, two level nitrification tank are connected with the mud discharging mouth of ultrafiltration apparatus, and sludge enters dirt The minimizings processing such as mud treatment system concentrated, is quenched, dehydration, stablize, desiccation or burning, the row of the sludge treating system The mouth of a river is connect with regulating reservoir, and the waste water of sludge removing flow to regulating reservoir and percolate merging treatment in pond.The Treatment of Sludge system System uses existing sludge treatment device.
Second purpose of the invention is achieved through the following technical solutions:A kind of landfill leachate concentration liquid zero discharge treatment Technique includes the following steps:
(1) landfill leachate enters pretreatment system through pipeline and is pre-processed, and removes the suspended matter in landfill leachate Content (SS) and metal ion and coarse suspended matter enter regulating water quality water in regulating reservoir later;
(2) water carries out Anaerobic Treatment from into anaerobic system after filtering in regulating reservoir;
(3) water outlet of anaerobic system is from progress denitrification and nitrification processing in MBR system is flowed into, subsequently into ultrafiltration apparatus Ultrafiltration, ultra-filtration water enter nanofiltration membrane system and carry out nanofiltration processing, the discharge of nanofiltration standard water discharge;
(4) the landfill leachate concentration liquid that nanofiltration membrane system generates enters in advanced oxidation reactor, adds sulfuric acid and height It is difficult to biodegradable pollutant in grade oxidant degradation concentrate, concentrate enters pH readjustments Chi Zhongjin and is about to concentrate later The pH of liquid pulls back to 8-9, and then concentrate enters in desalination reaction pond, add desalination medicament removal high price salt ion, be discharged into Enter sedimentation basin to be precipitated;
(5) supernatant in sedimentation basin is back to regulating reservoir and mixes and be further processed with landfill leachate in pond.
In the step (2), anaerobic system uses MS anaerobic systems, and water upflow velocity is controlled in 0.6-0.8m/h, is had Machine spatial load forecasting is in 7kgCOD/m3D or less.MS anaerobic systems gather granule sludge and biomembrane in one under anaerobic environment Body, biomass is high, and mass transfer effect is good, loads methanogen (MPB) and sulfate reducing bacteria (SRB) dominant microflora.Nothing in water inlet In the presence of sulfate, the removal of COD relies primarily on the effect of methanogen, in the presence of having sulfate in water inlet, organic matter Anaerobic degradation approach changes, and the reduction of sulfate needs a certain amount of organic matter as matrix, reduction 1mol SO4 2-It needs The COD for consuming 2mol, there is SO4 2-In the presence of, the removal of COD is methanogen and the coefficient result of sulfate reducing bacteria.And There are substrate competitions for methanogen and sulfate reducing bacteria, therefore, by changing influent COD and sulfate concentration, control in the present invention COD/SO processed4 2->=2, the good dominant microflora methanogen (MPB) of symbiosis and sulfate reducing bacteria (SRB) are turned out, Under the action of MPB and SRB, the pollutants such as COD and sulfate in landfill leachate can be effectively removed.
In the step (3), the water outlet of anaerobic system is successively in level-one denitrification pond, level-one nitrification tank, two level denitrification Denitrification and nitration reaction are carried out in pond and two level nitrification tank, wherein control DO concentration in anti-nitration reaction twice in 0.5mg/L Hereinafter, DO concentration is controlled in nitration reaction twice in 2-5mg/L;Meanwhile controlling the sludge concentration of each denitrification pond and nitrification tank For 15-30g/L, organic sludge load is 0.05-0.1kgCOD/kgMLSSd, and total nitrogen sludge loading is 0.02-0.05kgTN/ The membrane flux of kgMLSSd, ultrafiltration membrane are controlled in 65L/m2﹒ h or less.
The middle-and-high-ranking oxidant of the step (4) is hydrogen peroxide and ferrous sulfate.
In the step (1), landfill leachate effective stay time in regulating reservoir is more than 7d.
In the step (1), in the pretreatment of landfill leachate, floated using hydraulic screen removal larger particles in grid pond Float reduces suspended matter in the deposition of regulating reservoir China and the subsequent pipeline of blocking and water pump etc.;Water enters coagulative precipitation tank Afterwards plus coagulant and flocculation aid, so that the particle for being difficult to precipitate in water is aggregated with one another and is formed colloid, then with it is miscellaneous in water body Matter combines the floccule body for forming bigger, floccule body to have powerful adsorption capacity, can not only adsorb suspended matter, moreover it is possible to absorbed portion bacterium And dissolved matter, floccule body is by absorption, and volume increases and sinks, to remove the SS and metal ion in landfill leachate And coarse suspended matter.
The invention also includes Treatment of Sludge steps, i.e. the level-one denitrification pond of MBR system, level-one nitrification tank, the anti-nitre of two level The sludge changed in pond, two level nitrification tank and ultrafiltration apparatus is dense through being carried out in the nearly sludge treating system of respective mud discharging mouth discharge The minimizings processing such as contracting, quenched, dehydration, stable, desiccation or burning;Meanwhile the waste water of sludge removing flows through discharge outlet and drains into tune Save pond and percolate merging treatment in pond.
The present invention has the following advantages:
(1) present invention include mainly by pretreatment system, regulating reservoir, anaerobic system, MBR system and nanofiltration membrane system successively The landfill leachate treatment subsystem connected and composed and the advanced oxidation desalination conjugated system for landfill leachate concentration liquid, It is provided simultaneously with landfill leachate and landfill leachate concentration liquid processing capacity.Rubbish is carried out with landfill leachate treatment subsystem Percolate processing is that the rubbish percolation liquid membrane that main body technology cooperates with advanced oxidation desalination conjugated system to carry out concentrates liquor treating process, Realization concentrate zero-emission, technical feasibility, operating cost are relatively low.
(2) MS anaerobic systems setting water distributor, packing layer, three phase separator and reflux in the present invention, pass through reflux Device controls organic loading and water upflow velocity, ensure that the system acts on the efficient removal of the COD of landfill leachate.
(3) present invention in MS anaerobic systems can turn out the good dominant microflora methanogen (MPB) of symbiosis and Sulfate reducing bacteria (SRB) can efficiently remove the pollutants such as COD and sulfate, effectively reduce and ooze under the action of MPB and SRB Salt accumulation problem, has a vast market foreground in filtrate system.
(4) operational effect of the present invention is good, and for salinity without apparent accumulation, operating cost is relatively low.
(5) landfill leachate provided by the invention concentrates liquid zero-discharge treatment system, for handling landfill leachate and rubbish Rubbish is percolated concentrated liquor, and not only macromolecular hardly degraded organic substance effectively in degradation concentrate, also effectively reduces salinity in concentrate Accumulation, the existing secondary pollution of concentrate processing, salt accumulation, operating cost is high, the high drawback of investment to solving, and has Effect reduces operating cost, has the broader market advantage.
Description of the drawings
The present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is the landfill leachate concentration liquid zero-discharge treatment system structural schematic diagram of the embodiment of the present invention 1.
Fig. 2 is the process flow diagram of the landfill leachate concentration liquid zero discharge treatment of the embodiment of the present invention 2.
Fig. 3 is the process flow diagram of the advanced oxidation desalination conjugated system of the embodiment of the present invention 2.
Specific implementation mode
Embodiment 1
Landfill leachate concentration liquid zero-discharge treatment system shown in FIG. 1 is one embodiment of the present of invention, including is located in advance Reason system, regulating reservoir 3, MS anaerobic systems, MBR system, nanofiltration membrane system, sludge treating system and for handling landfill leachate The advanced oxidation desalination conjugated system of concentrate.Pretreatment system, regulating reservoir 3, MS anaerobic systems, MBR system and nanofiltration membrane system System is sequentially connected the landfill leachate treatment subsystem constituted for handling landfill leachate, the concentrate discharge of nanofiltration membrane system Mouth is connect with advanced oxidation desalination conjugated system, and the landfill leachate concentration liquid that nanofiltration membrane system generates, which is sent into advanced oxidation, to be taken off Salt conjugated system carries out oxidation desalting processing, the discharge outlet of advanced oxidation desalination conjugated system by pipeline and regulating reservoir 3 into The mouth of a river connects.
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 particles float object larger in landfill leachate.The water outlet of coagulative precipitation tank 2 is connect with the water inlet of regulating reservoir 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 regulating reservoir 3.
Stirring in slurry device is set in regulating reservoir 3, water quality, runoff investigation are carried out for stirring landfill leachate.Regulating reservoir 3 Volume can make landfill leachate effective stay time be more than 7 days.Water pump 20 and mistake are set between regulating reservoir 3 and MS anaerobic systems Filter 19, it is quenched after landfill leachate enter back into MS anaerobic systems after filtering, reduce sludge quantity in MS anaerobic systems, carry 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 systems. MS anaerobic systems include MS anaerobic reactors 4 and reflux.4 top of MS anaerobic reactors be equipped with exhaust outlet, water outlet and with The refluxing opening of reflux 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, the biomembrane with above-mentioned dominant microflora, rubbish Rubbish percolate passes through granule sludge layer and packing layer successively through water distributor water distribution, then pass through three phase separator make water and gas and Solid detach, 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 reactors, water outlet then with water distributor into The mouth of a river connects, organic in water upflow velocity and MS anaerobic reactors 4 to control by effluent recycling MS anaerobic reactors 4 Load, domestication methanogen (MPB) and sulfuric acid can be cultivated by so that system initial start stage is built in MS anaerobic reactors 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 reactors and packing layer, be eliminated as much as landfill leachate The pollutants such as middle COD and sulfate.
MBR system uses external, including by 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, two level denitrification pond 7 and two level nitrification Pond 8, landfill leachate carry out biological denitrificaion and degradation CODCr in biochemical reaction tank, and COD removal rates reach 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 NF membrane (NF) system further goes remaining organic pollution in water removal, COD removal rates to reach 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 Part configures and controls suitable reaction condition to realize efficient denitrification and nitration reaction, realizes that biological denitrificaion and degradation have Machine pollutant.Diving mixer is set in level-one denitrification pond 5 and two level denitrification pond 7, the DO concentration for controlling water in pond. Jet aerator is set in level-one nitrification tank 6 and two level nitrification tank 8, the DO concentration for controlling 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, allows water process to be carried out continuously.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 being reacted by the sequentially connected medicament addition device 12 of pipeline, advanced oxidation Pond 13, pH readjustments pond 14, desalination reaction pond 15 and sedimentation basin 16.The water inlet of advanced oxidation reaction tank 13 is stored up with nanofiltration concentrate 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, and softening and oxidative degradation are carried out to concentrate Pollutant process.After the waste water of gained enters pH readjustments 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 regulating reservoir 3, the supernatant of sedimentation basin 16, which is back to regulating reservoir 3, to be mixed with landfill leachate in pond and subsequently located Reason realizes that landfill leachate concentrates liquid zero-emission.
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 two level Change pond 7, two level nitrification tank 8 to connect with the mud discharging mouth of ultrafiltration apparatus 9, sludge enter sludge treating system 17 concentrated, The minimizings processing such as quenched, dehydration, stable, desiccation or burning.The discharge outlet of sludge treating system 17 is connect with regulating reservoir 3, dirty The waste water of mud removing flow to regulating reservoir 3 and is mixed with percolate in pond and carry out subsequent processing.Sludge treating system 17 is using existing Sludge treatment device.
Embodiment 2
Fig. 2 and it is shown in Fig. 3 be the present embodiment technological process.
(1) landfill leachate enters pretreatment system through pipeline and is pre-processed.Influent quality is: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 particles float object larger in percolate, reduce deposition and blocking of the suspended matter in regulating reservoir 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 regulating reservoir 3.3 residence time of regulating reservoir is more 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 regulating reservoir 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 systems with the promotion of water pump 20 in regulating reservoir 3 Anaerobic Treatment.Water upflow velocity is controlled in 0.6-0.8m/h by reflux, organic loading is controlled in 7kgCOD/m3·d Below.MS anaerobic systems gather 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, reduction 1mol SO4 2-The COD for needing consumption 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 good dominant microflora methanogen (MPB) and sulfate reducing bacteria (SRB) can effectively go under the action of MPB and SRB Except the pollutants such as COD and sulfate in landfill leachate, COD removal rates reach 75% or more, and sulfate removal rate reaches 80% More than, to greatly reduce the processing load of follow-up 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 systems 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, two level denitrification pond 7 and two 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 rates 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 detaches, and last ultrafiltration clear liquid enters nano filter membrance device 10 and remaining organic pollution in water removal, COD removal rates is further gone to reach To 90% or more, it is ensured that water outlet reaches Guangdong Province's provincial standard《Sewage Water Emissions limit value》(DB44/26-2001) the second period The requirement of primary standard, COD≤90mg/L, BOD5≤ 20mg/L, NH3-N≤10mg/L。
(4) nanofiltration concentrate that nanofiltration membrane system generates, i.e. landfill leachate concentrate liquid, into advanced oxidation reactor 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 readjustments pond 14 and carries out pH readjustments, 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 is precipitated into sedimentation basin 16, removes in concentrate A large amount of salinity.
(5) supernatant in sedimentation basin 16 is back to regulating reservoir 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, two level denitrification pond 7, two level nitrification tank 8 and super Sludge in filter device 9, which is emitted into through respective mud discharging mouth in sludge treating system 17, 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 regulating reservoir 3 and percolate in pond through discharge outlet Merge, continues the processing of step (2) to (4).
For those skilled in the art, technical solution that can be as described above and design are made other each The corresponding change of kind and deformation, and all these changes and deformation should all belong to the protection model of the claims in the present invention Within enclosing.

Claims (10)

1. a kind of landfill leachate concentrates liquid zero-discharge treatment system, including pretreatment system, regulating reservoir, anaerobic system, MBR systems System and nanofiltration membrane system, characterized in that further include the advanced oxidation desalination conjugated system that liquid is concentrated for handling landfill leachate, The pretreatment system, regulating reservoir, anaerobic system, MBR system and nanofiltration membrane system are sequentially connected composition and are oozed for handling rubbish The landfill leachate treatment subsystem of filtrate, the concentrate floss hole of the nanofiltration membrane system are conjugated with the advanced oxidation desalination System connects, and the landfill leachate concentration liquid that the nanofiltration membrane system generates enters advanced oxidation desalination conjugated system and aoxidized Desalting processing, the advanced oxidation desalination conjugated system include being adjusted back by the sequentially connected advanced oxidation reaction tank of pipeline, pH Pond, desalination reaction pond and sedimentation basin, the sedimentation basin top are equipped with water outlet, which is connect by pipeline with regulating reservoir, The supernatant of sedimentation basin is back to regulating reservoir, subsequent processing is mixed and carried out with landfill leachate in pond, realizes landfill leachate Concentrate zero-emission.
2. landfill leachate according to claim 1 or claim 2 concentrates liquid zero-discharge treatment system, characterized in that the anaerobism system System is MS anaerobic systems, including MS anaerobic reactors and reflux, MS anaerobic reactors top be equipped with water outlet and with Reflux connection refluxing opening, inside set gradually from bottom to up water distributor, contain methanogen and sulfate reducing bacteria The packing layer and three phase separator of the granule sludge layer of dominant microflora, the biomembrane with the dominant microflora;The reflux dress It sets including reflux pump, water inlet is connect with anaerobic reation pool refluxing opening, and water outlet is then connect with water distributor water inlet, by water It flows back in anaerobic reation pool, controls the organic loading in water upflow velocity and reaction tank.
3. landfill leachate concentrates liquid zero-discharge treatment system according to claim 1, characterized in that the MBR system is adopted Include with external, including by pipeline and the sequentially connected biochemical reaction tank of water pump and ultrafiltration apparatus, wherein biochemical reaction tank Sequentially connected level-one denitrification pond, level-one nitrification tank, two level denitrification pond and two level nitrification tank, the water outlet of two level nitrification tank It is connect with the water inlet of ultrafiltration apparatus.
4. landfill leachate concentrates liquid zero-discharge treatment system according to claim 3, 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- Pond water inlet is answered to connect, landfill leachate concentration liquid, which is sent into advanced oxidation desalination conjugated system, carries out oxidation desalting processing.
5. landfill leachate concentrates liquid zero-discharge treatment system according to claim 3, characterized in that further include Treatment of Sludge System, the sludge import of the sludge treating system and the level-one denitrification pond of MBR system, level-one nitrification tank, two level denitrification pond, Two level nitrification tank is connected with the mud discharging mouth of ultrafiltration apparatus, and the discharge outlet of the sludge treating system is connect with regulating reservoir, dirty The waste water of mud removing flow to regulating reservoir and is mixed with percolate in pond and carry out subsequent processing.
6. a kind of landfill leachate concentrates liquid Zero-discharge treating process, characterized in that include the following steps:
(1) landfill leachate enters pretreatment system through pipeline and is pre-processed, remove landfill leachate in SS and metal from Sub and coarse suspended matter enters regulating water quality water in regulating reservoir later;
(2) water outlet of the regulating reservoir enters anaerobic system progress Anaerobic Treatment after filtering;
(3) water outlet of the anaerobic system is from progress denitrification and nitrification processing in MBR system is flowed into, subsequently into ultrafiltration apparatus Ultrafiltration, ultra-filtration water enter nanofiltration membrane system and carry out nanofiltration processing, the discharge of nanofiltration standard water discharge;
(4) the landfill leachate concentration liquid that the nanofiltration membrane system generates enters in advanced oxidation reactor, adds sulfuric acid and height It is difficult to biodegradable pollutant in grade oxidant degradation concentrate, concentrate enters pH readjustments Chi Zhongjin and is about to concentrate later The pH of liquid pulls back to 8-9, and then concentrate enters in desalination reaction pond, add desalination medicament removal high price salt ion, be discharged into Enter sedimentation basin to be precipitated;
(5) supernatant in the sedimentation basin is back to the regulating reservoir and landfill leachate merging treatment in pond.
7. landfill leachate according to claim 6 concentrates liquid Zero-discharge treating process, characterized in that the step (2) In, COD and sulfate concentration ratio COD/SO of the control into the water of anaerobic system4 2->=2, anaerobic system is MS anaerobic systems, packet MS oxidation reactors and reflux are included, is controlled water upflow velocity in 0.6-0.8m/h by the reflux, it is organic negative Lotus controls in 7kgCOD/m3D or less.
8. the landfill leachate described according to claim 6 or 7 concentrates liquid Zero-discharge treating process, characterized in that the step (3) in, the water outlet of anaerobic system sequentially enters level-one denitrification pond, level-one nitrification tank, two level denitrification pond and two level nitrification tank Middle progress denitrification and nitration reaction, wherein control DO concentration in anti-nitration reaction twice in 0.5mg/L hereinafter, nitrifying twice DO concentration is controlled in reaction in 2-5mg/L;Meanwhile the sludge concentration for controlling each denitrification pond and each 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, The membrane flux of ultrafiltration membrane is controlled in 65L/m2﹒ h or less.
9. landfill leachate according to claim 8 concentrates liquid Zero-discharge treating process, characterized in that the step (1) In, landfill leachate effective stay time in regulating reservoir is more than 7d.
10. landfill leachate according to claim 8 concentrates liquid Zero-discharge treating process, characterized in that further include sludge Processing step, i.e. the level-one denitrification pond of MBR system, level-one nitrification tank, two level denitrification pond, two level nitrification tank and ultrafiltration apparatus In sludge discharged through respective mud discharging mouth and carry out sludge reduction processing in nearly sludge treating system;Meanwhile sludge is de- The waste water removed drains into regulating reservoir and percolate merging treatment in pond.
CN201810312087.4A 2018-04-09 2018-04-09 A kind of landfill leachate concentration liquid zero-discharge treatment system and technique Pending CN108373238A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
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CN110395847A (en) * 2019-08-02 2019-11-01 宇创环保产业有限公司 A kind of domestic garbage burning electricity generation clinker resource utilization Environmental Protection System
CN110407412A (en) * 2019-08-06 2019-11-05 陈葆良 It is a kind of to utilize high-power electron beam catalysis oxidation method for treating garbage percolation liquid
CN111439894A (en) * 2020-04-27 2020-07-24 杭州康诺环境技术工程有限公司 Treatment process of landfill leachate
CN112159030A (en) * 2020-09-11 2021-01-01 郑州绿清环保科技有限公司 Novel leachate treatment system
CN112679034A (en) * 2020-11-20 2021-04-20 武汉天源环保股份有限公司 Wastewater treatment method and system
CN113003726A (en) * 2021-03-04 2021-06-22 重庆理工大学 Treatment method of reverse osmosis membrane filtration concentrated solution of landfill leachate

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110395847A (en) * 2019-08-02 2019-11-01 宇创环保产业有限公司 A kind of domestic garbage burning electricity generation clinker resource utilization Environmental Protection System
CN110407412A (en) * 2019-08-06 2019-11-05 陈葆良 It is a kind of to utilize high-power electron beam catalysis oxidation method for treating garbage percolation liquid
CN111439894A (en) * 2020-04-27 2020-07-24 杭州康诺环境技术工程有限公司 Treatment process of landfill leachate
CN112159030A (en) * 2020-09-11 2021-01-01 郑州绿清环保科技有限公司 Novel leachate treatment system
CN112679034A (en) * 2020-11-20 2021-04-20 武汉天源环保股份有限公司 Wastewater treatment method and system
CN113003726A (en) * 2021-03-04 2021-06-22 重庆理工大学 Treatment method of reverse osmosis membrane filtration concentrated solution of landfill leachate
CN113003726B (en) * 2021-03-04 2022-07-01 重庆理工大学 Treatment method of reverse osmosis membrane filtration concentrated solution of landfill leachate

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