CN102863119A - Method of treating landfill leachate - Google Patents

Method of treating landfill leachate Download PDF

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Publication number
CN102863119A
CN102863119A CN2012103490215A CN201210349021A CN102863119A CN 102863119 A CN102863119 A CN 102863119A CN 2012103490215 A CN2012103490215 A CN 2012103490215A CN 201210349021 A CN201210349021 A CN 201210349021A CN 102863119 A CN102863119 A CN 102863119A
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pond
tank
reactor
anaerobic
online
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CN102863119B (en
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阮文权
赵明星
关国强
徐辰
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WUXI MASHENG ENVIRONMENT ENERGY TECHNOLOGY CO., LTD.
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Jiangnan University
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Abstract

The invention discloses a method of effectively treating landfill leachate, which is capable of effectively treating the landfill leachate by adopting a method of post-treatment, anaerobic reaction, high-intensity aerobic reaction, anaerobic ammonia oxidation reaction, multistage multi-circulation anaerobic (aerobic) reaction and aerobic reaction, and producing methane simultaneously. When the leachate is effectively treated, the recycling methane is generated, the system has stable operation and good COD (Chemical Oxygen Demand) and ammonia nitrogen removal effect, and the treatment effect is better under the condition of complicated water quality and water yield fluctuation of raw material fluid. The method is a treatment method with better application prospect.

Description

A kind of method for the treatment of refuse percolate
Technical field
The present invention relates to a kind of method for the treatment of refuse percolate, belong to technical field of sewage.
Background technology
The conventional treatment method of China's domestic refuse is sanitary landfill, but in recent years because the continuous increase of the generation of domestic refuse, a plurality of cities of China have been absorbed in the predicament in " rubbish encirclement city ".Burnt away the refuse more and more in recent years that the power station has moved or in building.Although solved the processing handling problems of domestic refuse, the percolate that produces immediately be treated as problem demanding prompt solution.Percolate is domestic refuse in transhipment and treating processes, and organic matter in garbage matter is decomposed the water that produces and the free-water in the rubbish and the sewage by eluviation formation, contains a large amount of organic pollutants, nitrogen, phosphorus and miscellaneous heavy metal class material.If do not process direct discharging, will cause serious pollution to environment water.
The processing of percolate always is the difficult problem in the sewage disposal, also is many water treatment experts' research emphasis in recent years.
Summary of the invention:
Technical problem solved by the invention provides a kind of method for the treatment of refuse percolate.
Technical scheme of the present invention is as follows:
Percolate carries out anaerobic reaction after pretreatment in the CLR reactor; Anaerobic effluent partly flows into and carries out aerobic reaction in the high-strength Aerobic Pond, and partial reflux re-starts anaerobic reaction; High-strength Aerobic Pond water outlet is processed through Anammox through behind the settling tank, and the water outlet of anaerobic ammonium oxidation pond is processed through multistage many circulation anaerobism or amphimicrobian pond and Aerobic Pond, through repeatedly denitrification, nitration treatment.Rear discharging.
Suspension content is higher from the percolate that trash repository is come, and described preprocessing process comprises: percolate at first enters coarse filter, and impurity that will be larger and macrobead suspended substance removal enter preliminary sedimentation tank suspended substance is further removed after the filtration; The preliminary sedimentation tank water outlet enters equalizing tank, and the percolate that different time comes from trash repository stops time a couple of days here, mixes fully, plays the effect of the balanced water yield, homogenizing water quality and cooling; Percolate is through after the pre-treatment, macrobead floating matter and suspended substance major part in the water are removed, reduced the deposition of these materials in follow-up unit, reduced the risk of stopping up follow-up equipment and pipeline, the water yield through pretreated percolate is stable, the water quality homogeneous is for good condition has been created in the steady running of follow-up bio-reaction system.
Preferentially percolate in the equalizing tank is pumped into souring tank, pH is between 6.8-7.2 in control, inlet amount 10-15m 3/ h pumps into the CLR reactor and carries out anaerobic reaction under the heating of interchanger feed liquid being heated to subsequently between 35 ± 2 ℃, control simultaneously upflow velocity 1-2m/h.Because the outer circulation of CLR reactor can reach 8:1 than maximum, therefore the CLR reactor moves under higher upflow velocity, recycle ratio is larger, water inlet had suitable shock absorption, system's impact resistance is stronger, is fit to very much water quality and the larger waste water treatments of water yield fluctuation such as percolate, and biological inoculum is " fluidized " in reactor simultaneously, strengthen to greatest extent the effect of mass transmitting of mud with organic matter, promoted the efficient of anaerobic treatment.Described biological inoculum derives from the granule sludge in the citric acid wastewater manufacturer anaerobic reactor, uses after domestication.
Anaerobic effluent is partly refluxed to souring tank, and part flows into carries out aerobic reaction in the high-strength Aerobic Pond, and the load that high-strength aerobic oxygen technique better than average is born is high, and is effective.High-strength Aerobic Pond is the nitrated bio-reactor of advanced oxidation, at high-strength Aerobic Pond feed-water end, current flow from top to bottom, waste water is entered to be full of evenly, reposefully high-strength Aerobic Pond water inlet end face in the high-strength Aerobic Pond, make waste water increase flow process and hydraulic detention time, mix simultaneously by Aeration fan and the abundant oxygenation of rotary disk aerator, plug-flow, and with waste water.By above-mentioned special fluidised form and the design of aeration mode, make the active sludge that can have the superelevation amount in the reactor, can efficiently process the waste water of ultrahigh concentration organism and ammonia nitrogen; Described active sludge derives from the excess sludge of certain municipal sewage plant, and through acclimation.About 50% ammonia nitrogen is converted into nitrite nitrogen in this process in high-strength Aerobic Pond, be beneficial to anaerobic ammonium oxidation process, improve the place to go effect of ammonia nitrogen, subsequently feed liquid overflow enters settling tank, the part sludge reflux is to high-strength Aerobic Pond in the settling tank, keep the amount of microorganism in the high-strength Aerobic Pond, part mud is expelled to sludge thickener.
The water outlet of high-strength Aerobic Pond enters anaerobic ammonium oxidation tank and carries out the Anammox reaction after the settling tank precipitation.Anammox is simple and effective denitrification system, 30-35 ℃ of control temperature, control upflow velocity 1-2m/h, be nitrite nitrogen with 50% mineralized nitrogen in the feed liquid, the nitrite nitrogen that utilization produces and other 50% ammonia nitrogen generate nitrogen by the Anammox effect, and nitrogen is removed from water body.
The anaerobic ammonium oxidation tank water outlet is qualified discharge behind multistage many circulation anaerobism (oxygen of holding concurrently)-Aerobic Pond.
Know-why of the present invention:
Adopt the efficient treating refuse percolate of mode of " pre-treatment+anaerobic reaction+high-strength aerobic reaction+Anammox reaction+multistage many circulation anaerobism (oxygen of holding concurrently)+aerobic reaction+subsequent disposal ", produce simultaneously biogas.
Remove the COD more than 80% in the feed liquid by pre-treatment and anaerobic reaction, remove COD by high-strength aerobic reaction afterwards, and the ammonia nitrogen Partial Conversion in the feed liquid is become nitrosification nitrogen, so that easier the carrying out of follow-up Anammox reaction.(oxygen of holding concurrently)+aerobic treatment is removed remaining ammonia nitrogen and COD in the feed liquid finally by crossing multistage many circulation anaerobism, thus qualified discharge.
This beneficial effect of the invention:
In the time of efficient treating refuse percolate, produced the biogas that resourcebility utilizes; Providing of exterior power can be provided in the stirring of biogas in the anaerobic reactor; Through high-strength aerobic after the COD of material further reduce, reaction provides good condition to Anammox, greatly reduces the load of follow-up multistage many circulation anaerobism (oxygen of holding concurrently)-Aerobic Pond.The present invention produces available biogas when having solved unmanageable percolate, so this technology has a good application prospect.
Embodiment:
Except specifying, the pond body all adopts skeleton construction among the present invention.
The percolate that comes from trash repository is introduced into magazine and the macrobead suspended substance removal that coarse filter will be larger, enters preliminary sedimentation tank after the filtration suspended substance is further removed, and enters the comprehensive adjustment pond behind the preliminary sedimentation tank water outlet process struvite pond and processes.Coarse filter adopts stainless steel netted, and preliminary sedimentation tank size: 4.5m * 4.0m * 6.0m is equipped with 2 of sludge pumps, and the feed liquid overflow enters the struvite pond; Struvite pond size: 7.1m * 4.0m * 5.8m, carry out aeration at the bottom of having aerated conduit to pass into the pond, subsequently overflow enters the comprehensive adjustment pond; Comprehensive adjustment pond size: 12.6m * 11.9m * 4.8m, be furnished with the one-drawing-two type hydraulic agitator and at the bottom of the pond, stir, be furnished with simultaneously thermometer and liquidometer, material stopped in the comprehensive adjustment pond about 3-4 days, and rear overflow enters separate tank; Separate tank size: 11.9m * 2.7m * 4.8m carries out preaeration at the bottom of having aerated conduit to pass into the pond, and is furnished with liquidometer and online pH meter.This stage COD clearance is 10%-20%.
Percolate in the equalizing tank is pumped into souring tank, and the souring tank design variable is H * D=8m * 3.5m, selects steel construction, by adding alkali control charging pH between 6.8-7.2, inlet amount 10-15m 3/ h under the heating of interchanger feed liquid being heated between 35 ± 2 ℃, pumps into the CLR anaerobic reactor subsequently subsequently.
The souring tank water outlet is first through interchanger, enter the CLR reactor through bottom eddy flow water distribution system again, CLR reactor design parameter is H * D=25m * 8m, select steel construction, top, middle part respectively is provided with online thermometer, top is equipped with online ORP meter, the anaerobic effluent mouth of pipe is equipped with pH meter, temperature of reaction is controlled at 35 ± 2 ℃, the CLR reactor is provided with up and down two-layer triphase separator and internal circulation system, the biogas that produces is through water-sealed tank, enter the garbage pool recycling behind the pipeline dewatering system, the biogas metering outfit is installed therebetween, produce situation and reactor running condition with Real Time Monitoring biogas, seed sludge derives from the granule sludge in the citric acid wastewater manufacturer anaerobic reactor, use after domestication, inoculum size is 30%-50%, treats the acclimation sludge standing for fermentation 3-5 days, when aerogenesis is flammable, begin to add waste water, improve load in the mode that progressively promotes flow, water outlet starts load and is 1kgCOD/ (m 3D), the gradient according to 20% progressively promotes load, and the COD clearance is required to be about 80% in each load gradient, and stable 3-5 days.The unloading phase finish to enter normal operating condition.
As mentioned above, the anaerobic reactor water part enters souring tank mixes with the anaerobism water inlet, the water inlet of dilution buffer high density, and provide acidifying required bacterial classification, the part water outlet enters follow-up high-strength Aerobic Pond and carries out aerobic reaction.
High-strength Aerobic Pond size: 19.8m * 12m * 6.2m, be furnished with four rotary disk aerators, and blast air with blower fan in the pond.The load that high-strength Aerobic Pond oxygen technique better than average is born is high, and is effective.High-strength Aerobic Pond is the nitrated bio-reactor of advanced oxidation, at high-strength Aerobic Pond feed-water end, current flow from top to bottom, waste water is entered to be full of evenly, reposefully high-strength Aerobic Pond water inlet end face in the high-strength Aerobic Pond, make waste water increase flow process and hydraulic detention time, mix simultaneously by Aeration fan and the abundant oxygenation of rotary disk aerator, plug-flow, and with waste water; By above-mentioned special fluidised form and the design of aeration mode, make the active sludge that can have the superelevation amount in the reactor, can efficiently process the waste water of ultrahigh concentration organism and ammonia nitrogen; Described active sludge derives from the excess sludge of certain municipal sewage plant, and through acclimation; Control high-strength aerobic interior dissolved oxygen between 2-4mg/L; Online ORP meter, online dissolved oxygen meter are installed in the pond; About 50% ammonia nitrogen is converted into nitrite nitrogen in this process in high-strength Aerobic Pond, be beneficial to anaerobic ammonium oxidation process, improve the place to go effect of ammonia nitrogen, subsequently feed liquid overflow enters settling tank, the part sludge reflux is to high-strength Aerobic Pond in the settling tank, keep the amount of microorganism in the high-strength Aerobic Pond, part mud is discharged sludge thickener, and supernatant liquor flows into anaerobic ammonium oxidation tank after precipitation.
The nitrosification nitrogen that high-strength Aerobic Pond internal reaction generates and the ammonia nitrogen in the feed liquid react in anaerobic ammonium oxidation tank and produce nitrogen, described anaerobic ammonium oxidation tank size: 6.0m * 5.75m * 6.8m, be divided into intermediate pool and reaction tank, feed liquid enters intermediate pool by the settling tank overflow, by interchanger feed temperature is controlled at 30-35 ℃, pump into subsequently reaction tank, the reaction tank temperature is controlled at 30-35 ℃.Because through CLR reactor and high-strength Aerobic Pond, pH meets the requirement of Anammox reaction, so need not regulate pH before the feed liquid.Feed liquid is entered by the reaction tank bottom, control upflow velocity 1-2m/h.Seed sludge is digested sludge in the reactor, forms granule sludge by domestication, and three separators is housed to realize mud-water separation at the reaction tank top, and online pH meter and online ORP meter are housed in the pond.
The molectron of multistage many circulation anaerobism (oxygen of holding concurrently) pond and Aerobic Pond is used for the COD that the degraded anaerobism fails to remove, and the effect of denitrogenating preferably dephosphorization is arranged, and can make water outlet reach the adapter standard.Multistage many circulation anaerobism (oxygen of holding concurrently)+Aerobic Pond size: 19.8m * 13.5m * 5.3m, be divided into six relatively independent but pond bodies of UNICOM, even distribution aeration head at the bottom of the pond, last pond body biofilm, can improve sludge concentration, be provided with simultaneously the multistage reflux of simple and reliable gas stripping type, feed liquid realizes denitrification through anaerobism (oxygen of holding concurrently) pond, after carry out nitrification through Aerobic Pond, and realize again denitrification by stripping reflux, nitrated, to strengthen the effect of denitrogenation processing, online pH meter is housed in the pond, online dissolved oxygen meter and online ORP meter, subsequently multistage many circulation anaerobism (oxygen of holding concurrently)+Aerobic Pond water outlet is through qualified discharge behind the settling tank.
The aerobic sludge of inoculation is the excess sludge of certain municipal sewage plant in multistage many circulation anaerobism (oxygen of holding concurrently)+Aerobic Pond, inoculate 20 tons, about solid content 25%, after 30-40 days domestications, metabolism, sludge concentration and activity can satisfy processing requirements, according to treatment effect, adjust sludge concentration 2-5g/L in the pond.
The percolate that is produced take the waste incineration of prosperous (Xuzhou) renewable source of energy generation company limited of Poly association is for processing object, built the treatment facility of 300 tons of day processing.After the aforesaid method processing, water outlet enters urban sewage pipe after reaching three grades of emission standards.Process percolate (COD is 60000-80000mg/L, and pH value 4-6, ammonia nitrogen are 1500-1800mg/L) 200-250 ton existing every day, daily output biogas 6000m 3

Claims (8)

1. the method for a treating refuse percolate is characterized in that, step is as follows:
(1) percolate is removed impurity through pre-treatment;
(2) anaerobic reaction is carried out in the water outlet of pre-treatment in the CLR reactor;
(3) anaerobic effluent partly flows into high-strength Aerobic Pond, and being partly refluxed to the CLR reactor should;
(4) high-strength Aerobic Pond water outlet enters anaerobic ammonium oxidation tank;
(5) water outlet of anaerobic ammonium oxidation pond is processed through multistage many circulation anaerobism or amphimicrobian pond and Aerobic Pond, through repeatedly denitrification, nitration treatment.
2. method as claimed in claim 1 is characterized in that, described pre-treatment is filtered for be introduced into coarse filter from percolate, enters preliminary sedimentation tank again, and water outlet enters the comprehensive adjustment pond after through the struvite pond, and the water outlet of comprehensive adjustment pond enters souring tank.
3. method as claimed in claim 2 is characterized in that material stopped about 3-4 days in the comprehensive adjustment pond, and rear overflow enters separate tank, carries out preaeration at the bottom of having aerated conduit to pass into the pond, and is furnished with liquidometer and online pH meter.
4. method as claimed in claim 2 is characterized in that, by adding alkali control charging pH between 6.8-7.2, inlet amount 10-15m 3/ h under the heating of interchanger feed liquid being heated between 35 ± 2 ℃, pumps into the CLR anaerobic reactor subsequently subsequently.
5. method as claimed in claim 1, it is characterized in that, described CLR reactor is selected steel construction, the middle part, top respectively is provided with online thermometer, top is equipped with online ORP meter, the anaerobic effluent mouth of pipe is equipped with pH meter, temperature of reaction is controlled at 35 ± 2 ℃, and the CLR reactor is provided with up and down two-layer triphase separator and internal circulation system, and the biogas of generation is through water-sealed tank, enter the garbage pool recycling behind the pipeline dewatering system, the biogas metering outfit is installed therebetween, produce situation and reactor running condition with Real Time Monitoring biogas, seed sludge derives from the granule sludge in the citric acid wastewater manufacturer anaerobic reactor, uses after domestication, inoculum size is 30%-50%, treat the acclimation sludge standing for fermentation 3-5 days, and when aerogenesis is flammable, began to add waste water, improve load in the mode that progressively promotes flow, water outlet starts load and is 1kgCOD/ (m 3D), the gradient according to 20% progressively promotes load, and the COD clearance is required to be about 80% in each load gradient, and stable 3-5 days.The unloading phase finish to enter normal operating condition.
6. method as claimed in claim 1 is characterized in that, described high-strength Aerobic Pond is equipped with online ORP meter, online dissolved oxygen meter, is furnished with rotary disk aerator, and blasts air with blower fan in the pond.
7. method as claimed in claim 1, it is characterized in that, described anaerobic ammonium oxidation tank is divided into intermediate pool and reaction tank, feed liquid enters intermediate pool by the settling tank overflow, by interchanger feed temperature is controlled at 30-35 ℃, pump into subsequently reaction tank, the reaction tank temperature is controlled at 30-35 ℃, feed liquid is entered by the reaction tank bottom, control upflow velocity 1-2m/h, seed sludge is digested sludge in the reactor, forms granule sludge by domestication, and three separators are housed to realize mud-water separation at the reaction tank top, online pH meter and online ORP meter are housed in the pond.
8. method as claimed in claim 1, it is characterized in that, described multistage many circulation anaerobism or amphimicrobian pond and Aerobic Pond are divided into six relatively independent but pond bodies of UNICOM, even distribution aeration head at the bottom of the pond, last pond body biofilm, be provided with the multistage reflux of simple and reliable gas stripping type, feed liquid realizes denitrification through anaerobism or amphimicrobian pond, after carry out nitrification through Aerobic Pond, and realize again denitrification, nitration treatment by stripping reflux, to strengthen the effect of denitrogenation processing, online pH meter, online dissolved oxygen meter and online ORP meter are housed in the pond.
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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN104310586A (en) * 2014-10-16 2015-01-28 徐州工程学院 Treatment system and treatment process for waste liquid in dried melon reducing sugar production process
CN105032924A (en) * 2015-08-06 2015-11-11 同济大学 Process for improving utilization property of high-solid-content anaerobic digested sludge land

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CN202139110U (en) * 2011-08-09 2012-02-08 孙伟 Internal-circulation anaerobic reactor
CN102515429A (en) * 2011-12-09 2012-06-27 北京工业大学 Device and method for combined denitrification of anoxic-oxic (A/O) shortcut nitrification and anaerobic ammonia oxidation of late-stage landfill leachate

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104310586A (en) * 2014-10-16 2015-01-28 徐州工程学院 Treatment system and treatment process for waste liquid in dried melon reducing sugar production process
CN104310586B (en) * 2014-10-16 2016-06-01 徐州工程学院 The treatment process of waste liquid in the dry reducing sugar production technique of melon
CN105032924A (en) * 2015-08-06 2015-11-11 同济大学 Process for improving utilization property of high-solid-content anaerobic digested sludge land

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