CN102863119B - Method of treating landfill leachate - Google Patents
Method of treating landfill leachate Download PDFInfo
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- CN102863119B CN102863119B CN201210349021.5A CN201210349021A CN102863119B CN 102863119 B CN102863119 B CN 102863119B CN 201210349021 A CN201210349021 A CN 201210349021A CN 102863119 B CN102863119 B CN 102863119B
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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
Technical field
A kind of method that the present invention relates to treating refuse percolate, belongs to technical field of sewage.
Background technology
The conventional treatment method of China's domestic refuse is sanitary landfill, but in recent years due to 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 ".More and more burnt away the refuse in recent years that power station has moved or in building.Although solved the processing handling problems of domestic refuse, the percolate producing immediately be treated as problem demanding prompt solution.Percolate is domestic refuse in transhipment and treating processes, and the sewage that organic matter in garbage matter is decomposed the water of generation and the free-water in rubbish and formed by eluviation, contains a large amount of organic pollutants, nitrogen, phosphorus and miscellaneous heavy metal class material.If do not process direct discharge, will environment water be caused to serious pollution.
The processing of percolate always is the difficult problem in sewage disposal, is also many water treatment experts' research emphasis in recent years.
Summary of the invention:
Technical problem solved by the invention is to provide a kind of method for the treatment of refuse percolate.
Technical scheme of the present invention is as follows:
Percolate after pretreatment, carries out anaerobic reaction in CLR reactor; Anaerobic effluent partly flows in high-strength Aerobic Pond and carries out aerobic reaction, and partial reflux re-starts anaerobic reaction; High-strength Aerobic Pond water outlet, after settling tank, is processed through Anammox, and the water outlet of anaerobic ammonium oxidation pond is processed through multistage many circulation anaerobism or amphimicrobian pond and Aerobic Pond, through denitrification, nitration treatment repeatedly.Rear discharge.
The percolate coming from trash repository, suspension content is higher, and described preprocessing process comprises: first percolate enters coarse filter, by larger impurity and macrobead suspended substance removal, enters preliminary sedimentation tank suspended substance is further removed after filtration; 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 after pre-treatment, macrobead floating matter and suspended substance major part in 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, water quality homogeneous, for good condition has been created in the steady running of follow-up bio-reaction system.
Preferentially percolate in equalizing tank is pumped into souring tank, control pH between 6.8-7.2, inlet amount 10-15m
3/ h is heated to feed liquid subsequently and between 35 ± 2 ℃, pumps into CLR reactor and carry out anaerobic reaction under the heating of interchanger, controls upflow velocity 1-2m/h simultaneously.Because the outer circulation of CLR reactor can reach 8:1 than maximum, therefore CLR reactor moves under higher upflow velocity, recycle ratio is larger, water inlet is had to suitable shock absorption, system impact resistance is stronger, is applicable to very much the water quality such as percolate and the larger waste water treatment of water yield fluctuation, and biological inoculum is " fluidized " in reactor simultaneously, strengthen to greatest extent mud and organic effect of mass transmitting, promoted the efficiency of anaerobic treatment.Described biological inoculum derives from the granule sludge in citric acid wastewater manufacturer anaerobic reactor, after domestication, uses.
Anaerobic effluent is partly refluxed to souring tank, and part flows in high-strength Aerobic Pond carries out aerobic reaction, and the load that high-strength aerobic oxygen technique better than average is born is high, 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 in high-strength Aerobic Pond and can be full of evenly, reposefully high-strength Aerobic Pond water inlet end face, make waste water increase flow process and hydraulic detention time, simultaneously by Aeration fan and the abundant oxygenation of rotary disk aerator, plug-flow, and waste water is mixed.By above-mentioned special fluidised form and the design of aeration mode, make can exist in reactor the active sludge of superelevation amount, 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.In high-strength Aerobic Pond, about 50% ammonia nitrogen is converted into nitrite nitrogen in this process, be beneficial to anaerobic ammonium oxidation process, improve the place to go effect of ammonia nitrogen, feed liquid overflow subsequently enters settling tank, in settling tank, part sludge reflux is to high-strength Aerobic Pond, the amount that maintains microorganism in 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 Anammox reaction after settling tank precipitation.Anammox is simple and effective denitrification system, control temperature 30-35 ℃, control upflow velocity 1-2m/h, by 50% mineralized nitrogen in feed liquid, it is nitrite nitrogen, the nitrite nitrogen that utilization produces and other 50% ammonia nitrogen generate nitrogen by Anammox effect, and nitrogen is removed from water body.
Anaerobic ammonium oxidation tank water outlet is qualified discharge after multistage many circulation anaerobism (oxygen of holding concurrently)-Aerobic Pond.
Know-why of the present invention:
The efficient treating refuse percolate of mode that adopts " pre-treatment+anaerobic reaction+high-strength aerobic reaction+Anammox reaction+multistage many circulation anaerobism (oxygen of holding concurrently)+aerobic reaction+subsequent disposal " produces biogas simultaneously.
By pre-treatment and anaerobic reaction, remove more than 80% COD in feed liquid, by high-strength aerobic reaction, remove COD afterwards, and the ammonia nitrogen Partial Conversion in feed liquid is become to nitrosification nitrogen, follow-up Anammox reaction is more easily carried out.Finally by crossing multistage many circulation anaerobism (oxygen of holding concurrently) ,+aerobic treatment is removed remaining ammonia nitrogen and COD in feed liquid, thus qualified discharge.
This beneficial effect of the invention:
In the time of efficient treating refuse percolate, produced the biogas that resourcebility utilizes; In anaerobic reactor, providing of exterior power can be provided in the stirring of biogas; Through high-strength aerobic after the COD of material further reduce, to Anammox, reaction provides good condition, greatly reduces the load of follow-up multistage many circulation anaerobism (oxygen of holding concurrently)-Aerobic Pond.The present invention, when having solved unmanageable percolate, produces available biogas, so this technology has a good application prospect.
Embodiment:
In the present invention, except special instruction, pond body all adopts skeleton construction.
The percolate coming from trash repository is introduced into coarse filter by larger magazine and macrobead suspended substance removal, enters preliminary sedimentation tank suspended substance is further removed after filtration, and preliminary sedimentation tank water outlet enters comprehensive adjustment pond and processes behind struvite pond.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 feed liquid overflow enters struvite pond; Struvite pond size: 7.1m * 4.0m * 5.8m, carries out aeration at the bottom of having aerated conduit to pass into pond, and overflow subsequently enters comprehensive adjustment pond; Comprehensive adjustment pond size: 12.6m * 11.9m * 4.8m, is furnished with one-drawing-two type hydraulic agitator and stirs at the bottom of pond, is furnished with thermometer and liquidometer simultaneously, and material stops about 3-4 days in comprehensive adjustment pond, 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 pond, and is furnished with liquidometer and online pH meter.This stage COD clearance is 10%-20%.
Percolate in equalizing tank is pumped into souring tank, and souring tank design variable is H * D=8m * 3.5m, selects steel construction, by adding alkali, controls charging pH between 6.8-7.2, inlet amount 10-15m
3/ h is heated to feed liquid between 35 ± 2 ℃ subsequently under the heating of interchanger, pumps into subsequently CLR anaerobic reactor.
Souring tank water outlet is first through interchanger, through bottom eddy flow water distribution system, enter CLR reactor again, CLR reactor design parameter is H * D=25m * 8m, select steel construction, top, middle part is respectively provided with online thermometer, top is provided with online ORP meter, the anaerobic effluent mouth of pipe is provided with pH meter, temperature of reaction is controlled at 35 ± 2 ℃, CLR reactor is provided with upper and lower two-layer triphase separator and internal circulation system, the biogas producing is through water-sealed tank, after pipeline dewatering system, enter garbage pool recycling, biogas metering outfit is installed therebetween, to monitor in real time biogas, produce situation and reactor running condition, seed sludge derives from the granule sludge in citric acid wastewater manufacturer anaerobic reactor, after domestication, use, inoculum size is 30%-50%, treat acclimation sludge standing for fermentation 3-5 days, when aerogenesis is flammable, start to add waste water, progressively to promote the mode of flow, improve load, water outlet starts load for 1kgCOD/ (m
3d), the gradient according to 20% progressively promotes load, and in each load gradient, COD clearance is required to be 80% left and right, and stable 3-5 days.Unloading phase finish to enter normal operating condition.
As mentioned above, anaerobic reactor water part enters souring tank mixes with anaerobism water inlet, the water inlet of dilution buffer high density, and provide acidifying required bacterial classification, 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, is furnished with four rotary disk aerators, and in pond, blasts air with blower fan.The load that high-strength Aerobic Pond oxygen technique better than average is born is high, 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 in high-strength Aerobic Pond and can be full of evenly, reposefully high-strength Aerobic Pond water inlet end face, make waste water increase flow process and hydraulic detention time, simultaneously by Aeration fan and the abundant oxygenation of rotary disk aerator, plug-flow, and waste water is mixed; By above-mentioned special fluidised form and the design of aeration mode, make can exist in reactor the active sludge of superelevation amount, 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 pond; In high-strength Aerobic Pond, about 50% ammonia nitrogen is converted into nitrite nitrogen in this process, be beneficial to anaerobic ammonium oxidation process, improve the place to go effect of ammonia nitrogen, feed liquid overflow subsequently enters settling tank, in settling tank, part sludge reflux is to high-strength Aerobic Pond, maintain the amount of microorganism in 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 in high-strength Aerobic Pond, reaction generates reacts and produces nitrogen with the ammonia nitrogen in feed liquid in anaerobic ammonium oxidation tank, 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 settling tank overflow, by interchanger, feed temperature is controlled to 30-35 ℃, pump into subsequently reaction tank, reaction tank temperature is controlled at 30-35 ℃.Due to process CLR reactor and high-strength Aerobic Pond before feed liquid, pH meets the requirement of Anammox reaction, therefore need not regulate pH.Feed liquid is entered by reaction tank bottom, controls upflow velocity 1-2m/h.In reactor, seed sludge is digested sludge, forms granule sludge, and three separators are housed to realize mud-water separation at reaction tank top by domestication, and online pH meter and online ORP meter are housed in pond.
The molectron of multistage many circulation anaerobism (hold concurrently oxygen) pond and Aerobic Pond, fails for the anaerobism of degrading the COD removing, and has the effect of denitrogenating preferably dephosphorization, can make water outlet reach 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, at the bottom of pond, be uniformly distributed aeration head, last pond body biofilm, can improve sludge concentration, be provided with the multistage reflux of simple and reliable gas stripping type simultaneously, feed liquid realizes denitrification through anaerobism (oxygen of holding concurrently) pond, after through Aerobic Pond, carry out nitrification, and realize denitrification again by stripping reflux, nitrated, to strengthen the effect of denitrogenation processing, online pH meter is housed in pond, online dissolved oxygen meter and online ORP meter, subsequently multistage many circulation anaerobism (oxygen of holding concurrently)+Aerobic Pond water outlet qualified discharge after settling tank.
The excess sludge of the aerobic sludge Wei Mou municipal sewage plant of inoculation in multistage many circulation anaerobism (oxygen of holding concurrently)+Aerobic Pond, inoculate 20 tons, solid content 25% left and right, after the domestications of 30-40 days, metabolism, sludge concentration and activity can meet processing requirements, according to treatment effect, adjust sludge concentration 2-5g/L in pond.
The percolate that the waste incineration of prosperous (Xuzhou) renewable source of energy generation company limited of the Poly of take association is produced, as processing object, has been built and day has been processed the treatment facility of 300 tons.After aforesaid method is processed, water outlet enters urban sewage pipe after reaching three grades of emission standards.Process percolate (COD is 60000-80000mg/L, pH value 4-6, ammonia nitrogen is 1500-1800mg/L) 200-250 ton existing every day, produce biogas 6000m daily
3.
Claims (5)
1. a method for 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 CLR reactor;
(3) anaerobic effluent partly flows into high-strength Aerobic Pond, is partly refluxed to souring tank;
(4) water outlet of high-strength Aerobic Pond enters anaerobic ammonium oxidation tank and carries out Anammox reaction after settling tank precipitation, and in settling tank, part sludge reflux is to high-strength Aerobic Pond, and settling tank supernatant liquor flows into anaerobic ammonium oxidation tank;
(5) anaerobic ammonium oxidation tank water outlet is processed through multistage many circulation anaerobism or amphimicrobian pond and Aerobic Pond, through denitrification, nitration treatment repeatedly;
Described pre-treatment is filtered for be introduced into coarse filter from percolate, then enters preliminary sedimentation tank, and water outlet enters comprehensive adjustment pond behind struvite pond, and the water outlet of comprehensive adjustment pond enters souring tank;
Described high-strength Aerobic Pond is equipped with online ORP meter, online dissolved oxygen meter, is furnished with rotary disk aerator, and in pond, blasts air with blower fan; At high-strength Aerobic Pond feed-water end, current flow from top to bottom, waste water is entered in high-strength Aerobic Pond and can be full of evenly, reposefully high-strength Aerobic Pond water inlet end face;
Described anaerobic ammonium oxidation tank is divided into intermediate pool and reaction tank, feed liquid enters intermediate pool by settling tank overflow, by interchanger, feed temperature is controlled to 30-35 ℃, pumps into subsequently reaction tank, reaction tank temperature is controlled at 30-35 ℃, feed liquid is entered by reaction tank bottom, control upflow velocity 1-2m/h, in reactor, seed sludge is digested sludge, by domestication, forms granule sludge, and triphase separator is housed to realize mud-water separation at reaction tank top, online pH meter and online ORP meter are housed in pond.
2. method as claimed in claim 1, is characterized in that, material stops about 3-4 days in comprehensive adjustment pond, and rear overflow enters separate tank, carries out preaeration at the bottom of having aerated conduit to pass into pond, and is furnished with liquidometer and online pH meter.
3. method as claimed in claim 1, is characterized in that, the water outlet of comprehensive adjustment pond enters souring tank, by adding alkali, controls charging pH between 6.8-7.2, inlet amount 10-15m
3/ h is heated to feed liquid between 35 ± 2 ℃ subsequently under the heating of interchanger, pumps into subsequently CLR reactor.
4. method as claimed in claim 1, it is characterized in that, described CLR reactor is selected steel construction, middle part, top is respectively provided with online thermometer, top is provided with online ORP meter, the anaerobic effluent mouth of pipe is provided with pH meter, temperature of reaction is controlled at 35 ± 2 ℃, CLR reactor is provided with upper and lower two-layer triphase separator and internal circulation system, the biogas producing is through water-sealed tank, after pipeline dewatering system, enter garbage pool recycling, biogas metering outfit is installed therebetween, to monitor in real time biogas, produce situation and reactor running condition, seed sludge derives from the granule sludge in citric acid wastewater manufacturer anaerobic reactor, after domestication, use, inoculum size is 30%-50%, treat acclimation sludge standing for fermentation 3-5 days, when aerogenesis is flammable, start to add waste water, progressively to promote the mode of flow, improve load, water outlet starts load for 1kgCOD/ (m
3d), the gradient according to 20% progressively promotes load, and in each load gradient, COD clearance is required to be 80% left and right, and stable 3-5 days, unloading phase finish to enter normal operating condition.
5. 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, at the bottom of pond, be uniformly distributed aeration head, last pond body biofilm, be provided with the multistage reflux of simple and reliable gas stripping type, feed liquid realizes denitrification through multistage many circulation anaerobism or amphimicrobian pond, after through Aerobic Pond, carry out nitrification, and realize denitrification again by stripping reflux, nitration treatment, to strengthen the effect of denitrogenation processing, online pH meter is housed in pond, online dissolved oxygen meter and online ORP meter.
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| 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 |
| CN105032924B (en) * | 2015-08-06 | 2017-08-25 | 同济大学 | It is a kind of to improve the high technique containing solid anaerobically digested sludge land use performance |
| CN107540147A (en) * | 2016-06-23 | 2018-01-05 | 帕克环保技术(上海)有限公司 | The Waste Water Treatment and method of wastewater treatment of cellulose ethanol |
| CN114195321B (en) * | 2021-11-15 | 2023-06-16 | 长沙工研院环保有限公司 | Multi-point reflux garbage leachate treatment equipment |
| CN114085012A (en) * | 2022-01-19 | 2022-02-25 | 湖南金旅环保股份有限公司 | Organic wastewater treatment system and organic wastewater treatment method |
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| CN2410293Y (en) * | 2000-03-12 | 2000-12-13 | 陈漫漫 | Integral synchronous denitrification biological treatment reactor |
| JP4780552B2 (en) * | 2005-03-31 | 2011-09-28 | 日立造船株式会社 | Biological wastewater treatment method |
| CN101050026B (en) * | 2007-04-17 | 2010-11-03 | 北京市环境保护科学研究院 | Deepness denitrogenation method for treating organic wastewater in high concentration |
| DK2172430T3 (en) * | 2007-08-08 | 2011-10-17 | Guanghao Peng | Process for removing impurities of C, N using heterotrophic ammonia-oxidizing bacteria |
| CN101244883B (en) * | 2008-03-21 | 2011-01-12 | 北京工业大学 | High-efficiency low-consumption retexture method for urban sewage |
| CN201485327U (en) * | 2009-07-14 | 2010-05-26 | 东莞市维新环保科技工程有限公司 | Inner circulating anaerobic reactor |
| CN102285710A (en) * | 2010-06-18 | 2011-12-21 | 天津科技大学 | Bittern-struvite pretreatment method for landfill leachate |
| CN201923882U (en) * | 2011-01-11 | 2011-08-10 | 彭永臻 | Single stage autotroph denitrification device for low C/N (carbon/nitrogen) high ammonia nitrogen wastewater |
| CN202139110U (en) * | 2011-08-09 | 2012-02-08 | 孙伟 | Internal-circulation anaerobic reactor |
| CN102515429B (en) * | 2011-12-09 | 2013-11-06 | 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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Address after: 7th Floor, Building 3, No. 2018, Lihu Avenue, Wuxi City, Jiangsu Province, 214122 Patentee after: Jiangsu Masheng Biotechnology Co.,Ltd. Address before: No. 314, No. 1, Zone B, Sunshine City Garden, Wuxi City, Jiangsu Province, 214073 Patentee before: WUXI MASUN ENVIRONMENTAL ENERGY TECHNOLOGY CO.,LTD. |