CN101863592A - Leachate treatment method for small town household refuse landfill sites - Google Patents
Leachate treatment method for small town household refuse landfill sites Download PDFInfo
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- CN101863592A CN101863592A CN 201010204234 CN201010204234A CN101863592A CN 101863592 A CN101863592 A CN 101863592A CN 201010204234 CN201010204234 CN 201010204234 CN 201010204234 A CN201010204234 A CN 201010204234A CN 101863592 A CN101863592 A CN 101863592A
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Abstract
The invention discloses a leachate treatment method for small town household refuse landfill sites. The method, which adopts two-stage SBR as a core and is organically integrated a chemicophysical method and a biological method, includes the following specific steps that: leachate first enters a regulating storage tank, the quantity of water is regulated, and the water quality is homogenized; the leachate then enters an anaerobic tank, part of COD in the leachate is degraded, so that biodegradability can be enhanced; the effluent of the anaerobic tank enters a two-stage SBR system, and while more COD is removed, the purpose of denitrification can be achieved; and the effluent of the two-stage SBR system undergoes coagulating sedimentation, so that most of suspended matters and total phosphorus in the water can be removed. The method has the advantages of simple technique, convenient management and maintenance, long-term, stable and reliable treatment effect and moderate construction and operation costs, and is applicable to the treatment of the leachate of small town household refuse landfill sites.
Description
Technical field
The present invention relates to a kind of leachate treatment method for small town household refuse landfill sites, belong to environmental technology field.
Background technology
Along with the economic fast development of China samll cities and towns, living standards of the people improve rapidly, and the generation of domestic refuse increases year by year, and the handling problems of domestic refuse needs to be resolved hurrily.Sanitary Landfill Technology because of reduced investment, working cost is low is used widely.But simultaneously, sanitary landfill produces a large amount of complicated components, the percolate that contains high-enriched organics and ammonia nitrogen that character is changeable, and the secondary pollution that brings thus becomes the problem that the landfill yard construction must solve.
The small town refuse landfill, the landfill small scale, percolate yields poorly, and generally about 100 tons/day, the leachate treatment technology with complicated requires height to fund, operation, personnel.Therefore, at this class landfill yard, be necessary that exploitation has that a kind of technology is simple, management maintenance is convenient, treatment effect is steady in a long-term reliable, and capital construction, leachate processing method that working cost is moderate.
Percolate is handled method commonly used and is mainly contained physico-chemical processes and biological process two big classes at present.
Physico-chemical processes comprises several different methods such as coagulation, stripping, charcoal absorption, method of evaporation, chemical precipitation, catalytic and oxidative electrolysis technology, ion-exchange, membrane sepn.The influence that physico-chemical process is changed by percolate water quality, the water yield is little, and stable effluent quality is especially to BOD
5/ COD (biochemical oxygen demand (BOD)/chemical oxygen demand (COD) on the 5th) is lower and percolate that be difficult to carry out a biological disposal upon has treatment effect preferably, but physico-chemical process processing costs height, generally is used for the pre-treatment or the advanced treatment of percolate.
Biological process has activated sludge process, biological contact oxidation process, A
2O, SBR, oxidation pond, soil facture, leachate recirculation etc.Wherein traditional SBR technology (sequence intermittent activated sludge process) is stable, ripe, and the processing of the very suitable little water yield sewage of the characteristics of itself, so traditional SBR is often used as the processing of small-sized rubbish landfill percolate.But, caused the contradiction between each functional flora in same sludge system because various biochemical reactions all are to finish among traditional SBR.Removal as COD and ammonia nitrogen, the purpose difference of these two processes, requirement to composition, base type and the envrionment conditions of microorganism is also different, so when adopting traditional SBR technology to carry out the percolate processing, have the problems such as contradiction of mud contradiction in age, organic concentration and the nitrification of difference in functionality flora.These problems have limited the treatment effect of traditional SBR technology and have made it can't reach the requirement that percolate is handled.
Comprehensive above two kinds of methods adopt the traditional biological method can't reach processing requirements separately, and only use materialization rule cost too high, and are infeasible economically.So the characteristics of handling in conjunction with the small town landfill percolate are carried out organic assembling with the proper physical chemical process again after the prior biological method suitably improved and are only and solve the effective way that percolate is handled problems.
Summary of the invention
It is simple to the purpose of this invention is to provide a kind of technology, is convenient to management maintenance, and treatment effect is steady in a long-term reliable, and construction, working cost are moderate, are fit to the method that the small town household refuse landfill sites percolate is handled.
Leachate treatment method for small town household refuse landfill sites of the present invention may further comprise the steps:
(1) percolate carry out in storage pond that the water yield is regulated and the water quality homogenize after, be transported in the anaerobic pond that impeller under water is housed and carry out anaerobic treatment;
(2) percolate after the anaerobic treatment enters the secondary SBR system that is composed in series by SBR I pond and SBR II pond, SBR I pond is mainly carried out the removal of COD and is handled, comprise four operation phase, be followed successively by restricted aeration water inlet, aeration, precipitation and water outlet stage, denitrogenation processing is mainly carried out in SBR II pond, comprise six operation phase, be followed successively by non-limiting water inlet, for the first time aeration, add methyl alcohol anoxia stirring, aeration, precipitation and water outlet stage for the second time;
(3) be transported to the coagulating sedimentation jar behind the middle pond of the percolate process regulating pondage after secondary SBR handles, add the coagulating sedimentation medicament and carry out the coagulating sedimentation processing;
(4) mud of discharging from secondary SBR system and coagulating sedimentation jar enters sludge thickener and concentrates, and supernatant liquor drains into anaerobic pond, and thickened sludge is backfilled to landfill yard.
Anaerobic pond described in the above-mentioned steps (1) can be rectangular-shaped pond, and impeller is installed in the diagonal angle of rectangle form pool under water.
The coagulating sedimentation medicament can adopt polymerize aluminum chloride and polyacrylamide, and the mass ratio of polymerize aluminum chloride and polyacrylamide is 30～50: 1.
In order to improve the mixed uniformly effect of percolate and medicament, the coagulating sedimentation jar adopts whirlwind-type coagulating sedimentation jar for well.
Technical process of the present invention is: percolate pumps into storage pond through pump well, enters anaerobic pond through lift pump by the pipeline divider again, removes portion C OD, improves biochemical.The anaerobic pond water outlet enters secondary SBR system, when further removing COD, reaches the purpose of denitrogenation.The water outlet of secondary SBR system enters intermediate pool, and middle Chi Shui is thus lifted to the coagulating sedimentation jar together with the coagulating sedimentation medicament, carries out advanced treatment.After coagulating sedimentation was handled, water outlet entered urban pipe network.The mud of discharging from secondary SBR system and coagulating sedimentation jar enters sludge thickener by action of gravity and handles, and mud is after concentrated, and supernatant liquor drains into anaerobic pond and handles, is backfilled to landfill yard after the excess sludge press filtration, avoids secondary pollution.
The advantage of leachate treatment method for small town household refuse landfill sites of the present invention:
1. technology is simple, is convenient to management maintenance, and capital construction, working cost are moderate, is fit to the small town household refuse loading embeading percolation liquid and handles.
2. effluent quality is good: except that COD, and BOD
5, NH
4 +-N, TN, TP, SS, colourity all can reach " household refuse landfill sites pollution control criterion " (GB16887-2008) table two requirement.
3. secondary SBR is divided into blended sludge system among the single-stage SBR flora and the main two sludge systems that play the flora of denitrogenation of main removal COD by function when having traditional single stage SBR advantage concurrently.Two kinds of sludge systems can efficiently be moved under optimum separately condition, solved problems such as mud contradiction in age, organic concentration and nitrification contradiction in the single-stage SBR sludge system.
Description of drawings
Fig. 1 is the process flow sheet of leachate treatment method for small town household refuse landfill sites
Embodiment
The invention will be further described below in conjunction with accompanying drawing and example.
Embodiment
Percolate treating processes with certain household refuse landfill sites at county level is an example, and the landfill waste amount of this landfill yard is about 100 tons/day, and percolate output is about 60 tons/day.Percolate is before processing, and the COD peak value reaches 50000mg/L, and the ammonia nitrogen peak value reaches 2000mg/L.
As Fig. 1, percolate at first enters storage pond, and the storage pond useful volume is about 5000m
3Storage pond mainly rises regulates the percolate water yield, the evenly effect of water quality, and under the anaerobism effect of storage pond, the clearance of COD is 10%～15% simultaneously.
Percolate enters the rectangle anaerobic pond through lift pump by the pipeline divider subsequently.At the diagonal angle of rectangle anaerobic pond impeller under water is installed, adopts the mode of bottom water inlet, sluggish flow is risen, form good anaerobe breeding environment, simultaneously, the impeller under water of anaerobic pond setting has stirring action preferably to muddy water.It is 320m that effective pond of anaerobic pond holds
3, the current residence time is 128h.Percolate is through behind the anaerobic pond, and the COD clearance is 20%～30%, BOD
5/ COD brings up to about 0.5 from about 0.4.
The anaerobic pond water outlet enters SBR I pond, and the useful volume in SBR I pond is 192m
3, sludge concentration is about 5g/L in the pond, mud about 10d in age.Adopt the mode of restriction aeration to intake, to play certain denitrification denitrogenation effect, flooding time is 1h.After water inlet is finished, carry out aeration by micro-hole aerator.When COD was degraded to lower level, nitrification was preponderated gradually, because nitration reaction will consume a large amount of basicity, tangible downtrending can appear in pH.So nitration reaction is controlled in the variation with pH, when obvious downtrending appears in pH, stop aeration, stop nitration reaction further to be carried out.After the processing of SBR I pond, the COD clearance of percolate is 40%～60%, and the ammonia nitrogen transformation efficiency is about 10%～20%.
Behind the precipitation 1h of SBR I pond supernatant liquor is drained into SBR II pond, be the water inlet of SBR II pond.It is 160m that effective pond, SBR II pond holds
3, sludge concentration is about 5g/L in the pond, mud about 25d in age.Adopt the unlimited aeration mode to intake flooding time 1h.Carry out the aeration first time after water inlet is finished, after ammonia nitrogen transforms substantially, microorganism will significantly reduce the consumption of oxygen, thereby cause dissolved oxygen in water to be obvious ascendant trend.In addition, after nitration reaction finished, basicity consumption also can obviously reduce, and showed as pH and stopped to descend, and be maintained within a certain range.So can control nitration reaction by the variation of dissolved oxygen and pH.Therefore, when dissolved oxygen in the SBR II pond occurs that significantly ascendant trend and pH value drop to a stationary value, stop aeration for the first time.Open SBR II pond diving mixer then, add methyl alcohol as denitrifying carbon source, the methyl alcohol dosage is nitrate and nitrite total amount 3 times in the water.Can produce basicity in the denitrification process, so can change the time that denitrification stirs of controlling by pH.Therefore, when pH rises to a stationary value, illustrate that denitrification finishes substantially, stop to stir and opening once more aeration this moment, make sludge settling with the nitrogen that produces by denitrification in the stripping come-up mud.Stop aeration for the second time at last, SBR II pond enters precipitate phase.After percolate was handled through SBR II pond, ammonia nitrogen was reduced to below the 25mg/L, and total nitrogen is below 40mg/L.
Above secondary SBR system is divided into blended sludge system among the single-stage SBR flora and the main two sludge systems that play the flora of denitrogenation of main removal COD by function when having traditional single stage SBR advantage concurrently.Make two kinds of sludge systems under optimum separately condition, efficiently to move, solved problems such as mud contradiction in age, organic concentration and nitrification contradiction in the single-stage SBR sludge system.
The water outlet of secondary SBR system enters intermediate pool, and the volume of intermediate pool is 120m
3Middle Chi Shui enters whirlwind-type coagulating sedimentation jar together with the medicament of coagulating sedimentation, and this jar diameter is 3m, virtual height 7m, useful volume 25m
3, hydraulic detention time is 2h.The medicament that coagulating sedimentation adds is polymerize aluminum chloride and polyacrylamide, and its compound concentration is respectively 10% and 0.5%, and working concentration is respectively 30mg/L and 1mg/L.Percolate special water distributing pore in jar in the coagulating sedimentation jar, make jar interior eddy current that forms, impel the medicament (polymerize aluminum chloride and polyacrylamide) and percolate uniform mixing that add, reach the purpose of coagulation, simultaneously under the effect of the formed centripetal force of eddy current in the percolate contained large granular impurity collide mutually, be combined into large volume blended solid throw out, catch, wrap some small granular suspended matters then and form the flco precipitation.After the coagulating sedimentation processing, the suspended substance removal rate is about 90%, water outlet SS＜30mg/L; The COD clearance is 20%～50%, water outlet COD＜500mg/L; Total tp removal rate is 60%～80%, water outlet TP＜3mg/L; About chroma removal rate 50%, colourity is less than 15 times.
Percolate is after above-mentioned art breading, and except that COD, all the other indexs are as BOD
5, NH
4 +-N, TN, TP, SS, colourity all can reach " household refuse landfill sites pollution control criterion " (GB16887-2008) table two requirement.
Concrete treatment effect of this technology such as following table
| Project | Water inlet | Water outlet |
| ??COD(mg/L) | ??5000～20000 | ??≤500 |
| ??BOD 5(mg/L) | ??2000～10000 | ??≤30 |
| ??NH 4 +-N(mg/L) | ??800～2000 | ??≤25 |
| ??TN(mg/L) | ??1000～2500 | ??≤40 |
| ??TP(mg/L) | ??10～20 | ??≤3 |
| ??SS(mg/L) | ??600～1000 | ??≤30 |
| Colourity (doubly) | ??60～100 | ??≤15 |
| ??pH | ??6～9 | ??6～9 |
Claims (4)
1. leachate treatment method for small town household refuse landfill sites is characterized in that may further comprise the steps:
(1) percolate carry out in storage pond that the water yield is regulated and the water quality homogenize after, be transported in the anaerobic pond that impeller under water is housed and carry out anaerobic treatment;
(2) percolate after the anaerobic treatment enters the secondary SBR system that is composed in series by SBR I pond and SBR II pond.SBR I pond is mainly carried out the removal of COD and is handled, comprise four operation phase, be followed successively by restricted aeration water inlet, aeration, precipitation and water outlet stage, denitrogenation processing is mainly carried out in SBR II pond, comprise six operation phase, be followed successively by non-limiting water inlet, for the first time aeration, add methyl alcohol anoxia stirring, aeration, precipitation and water outlet stage for the second time;
(3) be transported to the coagulating sedimentation jar behind the middle pond of the percolate process regulating pondage after secondary SBR handles, add the coagulating sedimentation medicament and carry out the coagulating sedimentation processing;
(4) mud of discharging from secondary SBR system and coagulating sedimentation jar enters sludge thickener and concentrates, and supernatant liquor drains into anaerobic pond, and thickened sludge is backfilled to landfill yard.
2. leachate treatment method for small town household refuse landfill sites according to claim 1 is characterized in that: the anaerobic pond described in the step (1) is rectangular-shaped pond, and impeller is installed in the diagonal angle of rectangle form pool under water.
3. leachate treatment method for small town household refuse landfill sites according to claim 1 is characterized in that: described coagulating sedimentation medicament is polymerize aluminum chloride and polyacrylamide, and the mass ratio of polymerize aluminum chloride and polyacrylamide is 30～50: 1.
4. leachate treatment method for small town household refuse landfill sites according to claim 1 is characterized in that: the coagulating sedimentation jar is a whirlwind-type coagulating sedimentation jar.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102101741A (en) * | 2010-12-30 | 2011-06-22 | 一重集团大连设计研究院有限公司 | Treatment device and treatment process method for leachate from waste incineration plants |
| CN102897973A (en) * | 2012-09-29 | 2013-01-30 | 北京工业大学 | Method and device for deep denitrification of garbage leachate |
| CN104085989A (en) * | 2014-07-15 | 2014-10-08 | 许建民 | Two-phase constant water level continuous flow SBR (Styrene Butadiene Rubber) reaction tank and process |
| CN104773926A (en) * | 2015-04-24 | 2015-07-15 | 山东省环科院环境科技有限公司 | High-nitrogen-content organic wastewater deep denitrification device and deep denitrification method |
| CN107285553A (en) * | 2017-04-20 | 2017-10-24 | 北京昊海天际科技有限公司 | A kind of method that percolate is handled in Landfill |
| WO2022018386A1 (en) | 2020-07-24 | 2022-01-27 | Suez Groupe | Biological treatment of effluents rich in carbonaceous matter and nitrogen with biogas production |
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| EP0481963A2 (en) * | 1986-07-03 | 1992-04-22 | Occidental Chemical Corporation | Microorganisms for degrading toxic waste materials |
| CN1544365A (en) * | 2003-11-27 | 2004-11-10 | 武汉安全环保研究院 | Urban refuse sanitary landfill leachate disposing process |
| CN101186415A (en) * | 2007-11-22 | 2008-05-28 | 武汉理工大学 | Method and device for treating garbage percolate by using combination coagulated two-stage sequencing batch type biological film |
| FR2913234A1 (en) * | 2007-03-02 | 2008-09-05 | Degremont Sa | Treating urban/industrial used water containing sulfide and ammonium, sewage, condensates and leachate, comprises biologically treating used water in free culture by anoxic treatment to eliminate organic carbon using heterotrophic bacteria |
| CN101423295A (en) * | 2008-11-21 | 2009-05-06 | 北京工业大学 | High nitrogen-containing landfill leachate processing method and apparatus |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0481963A2 (en) * | 1986-07-03 | 1992-04-22 | Occidental Chemical Corporation | Microorganisms for degrading toxic waste materials |
| CN1544365A (en) * | 2003-11-27 | 2004-11-10 | 武汉安全环保研究院 | Urban refuse sanitary landfill leachate disposing process |
| FR2913234A1 (en) * | 2007-03-02 | 2008-09-05 | Degremont Sa | Treating urban/industrial used water containing sulfide and ammonium, sewage, condensates and leachate, comprises biologically treating used water in free culture by anoxic treatment to eliminate organic carbon using heterotrophic bacteria |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102101741A (en) * | 2010-12-30 | 2011-06-22 | 一重集团大连设计研究院有限公司 | Treatment device and treatment process method for leachate from waste incineration plants |
| CN102101741B (en) * | 2010-12-30 | 2012-09-05 | 一重集团大连设计研究院有限公司 | Treatment device and treatment process method for leachate from waste incineration plants |
| CN102897973A (en) * | 2012-09-29 | 2013-01-30 | 北京工业大学 | Method and device for deep denitrification of garbage leachate |
| CN104085989A (en) * | 2014-07-15 | 2014-10-08 | 许建民 | Two-phase constant water level continuous flow SBR (Styrene Butadiene Rubber) reaction tank and process |
| CN104085989B (en) * | 2014-07-15 | 2015-12-02 | 许建民 | The permanent water level Continuous Flow sbr reactor pond of a kind of two-phase and technique |
| CN104773926A (en) * | 2015-04-24 | 2015-07-15 | 山东省环科院环境科技有限公司 | High-nitrogen-content organic wastewater deep denitrification device and deep denitrification method |
| CN107285553A (en) * | 2017-04-20 | 2017-10-24 | 北京昊海天际科技有限公司 | A kind of method that percolate is handled in Landfill |
| WO2022018386A1 (en) | 2020-07-24 | 2022-01-27 | Suez Groupe | Biological treatment of effluents rich in carbonaceous matter and nitrogen with biogas production |
| FR3112768A1 (en) * | 2020-07-24 | 2022-01-28 | Suez Groupe | BIOLOGICAL TREATMENT OF EFFLUENTS RICH IN CARBON AND NITROGEN MATTER WITH BIOGAS PRODUCTION |
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