CN101314503A - Processing method for garbage leachate - Google Patents
Processing method for garbage leachate Download PDFInfo
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- CN101314503A CN101314503A CNA2008100118972A CN200810011897A CN101314503A CN 101314503 A CN101314503 A CN 101314503A CN A2008100118972 A CNA2008100118972 A CN A2008100118972A CN 200810011897 A CN200810011897 A CN 200810011897A CN 101314503 A CN101314503 A CN 101314503A
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Abstract
The invention relates to a method for treating landfill leachate. The method adopts the technical proposal that: adding urea and monopotassium phosphate into the leachate to make the ratio of C to N to P be 280-320 to 3-7 to 1, with the pH value between 6 and 8 at a temperature of between 30 and 40 DEG C; feeding the treated leachate into an upflow anaerobic sludge compound bed reactor, with a hydraulic load between 8 and 12 kg CODCr/m<3>.d, the hydraulic detention time for 8 to 12 hours, an alkalinity in the reactor between 1,000 and 3,000 mg/L and a volatile fatty acid VFA between 100 and 800 mg/L; feeding the treated leachate into a compound bio-membrane reactor by adopting limited aeration as an aeration mode, precipitating for 0.5 to 1.5 hours at an aeration speed of between 150 and 170 L/h for 5 to 7 hours, with a sludge concentration in the reactor maintained to between 4 and 5 g/L at a water temperature of between 10 and 30 DEG C. The method has the advantages of good pollutant removal effect and low cost; moreover, a discharge water index by the method can reach the leachate discharge standard of grade II.
Description
Technical field:
The present invention relates to a kind of method for treating waste liquid, particularly a kind of water treatment method at percolate.
Background technology:
Percolate be meant rubbish stack and the landfill process in owing to ferment and the drip washing of rainwater, wash away, and surface water and phreatic immersion and the black red-brown aqueous solution that from refuse landfill, oozes out.It is one of principal element that produces in the garbage loading embeading process secondary pollution.The water-quality constituents complexity of percolate, the Pollutant levels height, water quality and quantity changes greatly, the harm longer duration.
Because the pollution load of percolate is very high, intractability is bigger, not only will consider the validity and the stability of treatment process, also must consider the economic rationality of its treatment process.These outstanding characteristics that percolate is handled are its treatment process design and the comparatively difficult reason place of operation.
Up to the present, rubbish leachate treatment method mainly contains biological treatment, materialization processing and land disposal method.The experimental data of comprehensive existing treatment process and the operation result of refuse landfill, there is following problem in garbage filter liquid processing method great majority:
1, adapts to the change of water quality ability, particularly adapt to the ability of change of water quality of whole landfill phase of landfill yard.Because landfill percolate water quality is with the prolongation of landfill time, BOD
5/ COD
CrOn a declining curve, biodegradability descends, and reduces to 0.1～0.2 of late period by the initial stage 0.4～0.5, landfill initial stage system's operational excellence can occur, and the unconformable situation of system then appears in the later stage.
2, can not satisfy secondary standard requirement in China (GB16889-1997).The experimental study and the engineering operation experience of percolate processing both at home and abroad show, conventional biological treatment, water outlet COD
CrGenerally, therefore must increase deep treatment method in original processing back at 500-1200mg/L.
3, high concentration organic contaminant and recalcitrant substance and high density NH
3-N causes technical process long, complex management, working cost height, and water outlet COD
CrBe difficult for up to standard with ammonia nitrogen.
Summary of the invention:
In order to address the above problem, the invention provides a kind of novel method for the treatment of refuse percolate, with method treating refuse percolate of the present invention, it is strong to adapt to the change of water quality ability, technical process is short, removes the effective of pollutent, and cost is low, efficient height, effluent characteristics can satisfy the secondary standard requirement in China (GB16889-1997).
The technical solution used in the present invention is: a kind of rubbish leachate treatment method comprises the following steps:
1) pre-treatment: percolate stoste is diluted, add urea and potassium primary phosphate in percolate, making the C of percolate: N: P is 280～320: 3～7: 1, and to adjust pH be 6～8, temperature is controlled at 35 ± 5 ℃;
2) upflow type anaerobic mud multiple-hearth is handled: treated percolate enters in the upflow type anaerobic mud composite bed reactor, and hydraulic load is controlled at 8～12kg COD
Cr/ m
3D, hydraulic detention time are 8～12 hours, and basicity is more than 1000～3000mg/L in the controlling reactor, and voltaile fatty acid VFA is at 100～800mg/L;
3) Using Hybrid Biofilm Reactor art breading; The percolate of handling through the last step enters in the Using Hybrid Biofilm Reactor, aeration mode is restricted aeration, settling time is 0.5～1.5 hour, aeration speed is 150～170L/h, aeration time is 5～7 hours,, the sludge concentration in the reactor should remain on 4～5g/L, and water temperature is controlled at 10～30 ℃.
Upflow type anaerobic mud multiple-hearth is handled the main upflow type anaerobic composite bed reactor (UASBF) that adopts.Upflow type anaerobic composite bed reactor (UASBF) has the advantage of up-flow anaerobic sludge blanket UASB (Upflow Anaerobic Sludge Bed) and anaerobic filter AF (AnaerobicFiltration) concurrently.Mud interception capacity and capacity of resisting impact load are strong, and the anti impulsion load and the processing efficiency of reactor are strong.Its function not only is to remove the organism in the percolate, but also can the organism of difficult for biological degradation be changed into the readily biodegradable organism by the acidication effect, improves organic clearance.This step is mainly anaerobic reaction, and the reaction of anaerobism section mainly is to remove high concentration organic contaminant, is converted into methane recovery simultaneously, and improves difficult for biological degradation pollutent biodegradable by the microbial hydrolytic acidification, for follow-up aerobic treatment provides prerequisite.
The composite biological film art breading is the aerobic section reaction, mainly adopts Using Hybrid Biofilm Reactor.Composite S BR (Sequencing Batch Reactor) technology is meant that existence is simultaneously adhered to and the sequence batch (biochemical reaction technology of suspension two-phase microorganism, and it is actually the combination of common SBR technology and biomembrance process.In original SBR pond, introduced microbial film, also promptly in reactor, add carrier filler, attached to contacting of the microorganism on the carrier filler and waste water, form microbial film, the organic pollutant that the microorganism on the microbial film will absorb in the waste water carries out growth and breeding as nutrition source.Carrier filler mainly contains Ball-type packing, combined stuffing, elastic filler and semi soft packing etc.From purification condition, microbial film is attached to the carrier filler surface, and the residence time is longer, and the slower microorganism of rate of propagation also can be lived on this film.Microbe population is many on the microbial film, and kind is also many, simultaneously, also has the protozoon and the metazoan of multiple kind on the microbial film, can form the stable ecosystem.Microbial film is difficult for running off attached to the carrier filler surface, contained microbial biomass height, and in the carrier filler space, also has the microorganism of a large amount of suspension growths, because microbial film spatially disperses, enlarged organic contact surface in microorganism and the waste water, these all help absorption and the degraded of microorganism.
The invention has the beneficial effects as follows:
1, adaptation change of water quality ability is strong.
2, start time is short.
UASBF starts load and is 0.5kg COD
Cr/ m
3D begins, water inlet COD
CrConcentration is at 1000～1200mg/L, and the pH value is 6.8, and C: N: P is 300: 5: 1, and adopts the mode of effluent recycling to control hydraulic load, and it is better to start treatment effect.When running to 50d, the reactor volume load is 2.2kg COD
Cr/ m
3D has granule sludge to produce COD in the reactor
CrClearance is stabilized in about 55%, starts to finish.
Composite S BR starts, the COD of water inlet
CrFor about 500mg/L, ammonia nitrogen is about 100mg/L, and pH is about 6.8, during the operation scheme taked be: water inlet 0.5h, aeration 6h, precipitation 1h, draining 0.5h.Started end, the COD of intaking through 30 days
CrClearance reaches 90%, and ammonia nitrogen removal frank reaches 85%.
3, anti impulsion load height.
UASBF has higher mud interception capacity and anti-hydraulic load impact capacity, test-results as can be seen, initial start stage load 0.2kgCOD
Cr/ m
3D begins, to load raising phase 15.12kgCOD
Cr/ m
3D, in the whole process, device steady running, big fluctuation does not appear in processing efficiency.
4, technical process is short.
In UASBF reactor and the composite S BR reactor, all be provided with filler, grow microbial film efficiently, increased the biomass in the reactor, improved the processing efficiency of sewage, shortened hydraulic detention time, 17 hours entire treatment cycles of operation.
5, remove the effective of pollutent.
This method adopts anaerobic and aerobic in conjunction with processing, and anaerobic reactor UASBF has higher mud interception capacity and capacity of resisting impact load strong, the sludge concentration height.Not only remove the organism in the percolate, but also can the organism of difficult for biological degradation be changed into the readily biodegradable organism, improve the biodegradability of water outlet, increased composite S BR technology organic clearance by the acidication effect.A whole set of technology has all reached more than 90% the clearance of pollutent, and the every index of water outlet all reaches China's percolate secondary discharge standard (GB 16889-1997).
6, Financial cost is low.
The volumetric loading of complete assembly is big, and treatment effect is good, and structures are simple, and the main equipment of composite S BR technology has only a reactor, does not need to establish in addition second pond and mud refluxing unit, can save preliminary sedimentation tank, reduces capital cost, and arranges compact.Anaerobic device does not need aeration, save energy.The mud generation is few in the complete assembly operational process, can save a large amount of sludge disposal expenses.Automation technolo degree height can the minimizing personnel dispose, and reduces the salary expens expense accordingly.Can produce biogas,, recycle as the energy.
The present invention by anaerobic-aerobic in conjunction with processing, it is strong that anaerobic reactor adapts to the change of water quality ability, in anaerobic reactor, introduced microbial film, the mud interception capacity is strong, improve the anti impulsion load and the processing efficiency of reaction vessel, improved water quality environment, improved the degradability of water quality, a whole set of technology is to the removal efficient height of pollutent, and cost is low.
Embodiment:
Embodiment 1
Sample: get the somewhere percolate, water quality is: light brown red, and foul smelling, COD
CrConcentration is 3000mg/L, and pH is 6.7, and ammonia nitrogen is 220mg/L, and TP is 19mg/L, and SS is 270mg/L.
Treatment process:
1) pre-treatment: percolate stoste is diluted, make COD
CrConcentration is 1100mg/L, adds urea and potassium primary phosphate in percolate, and making the C of percolate: N: P is 300: 5: 1, and to adjust pH be 6.8, and temperature is controlled at 35 ± 1 ℃;
2) upflow type anaerobic mud multiple-hearth is handled: treated percolate enters in the upflow type anaerobic mud composite bed reactor, and hydraulic load is controlled at 10kg COD
Cr/ m
3D, hydraulic detention time are 10 hours, and basicity is at 2000mg/L in the controlling reactor, and voltaile fatty acid VFA is at 600mg/L;
Upflow type anaerobic mud composite bed reactor (UASBF): the bottom is the UASB reaction zone, the middle part is a three-phase separation area, and top is anaerobic filter bed (AF), and reactor is a cylindrical-shaped structure, internal diameter 120mm, its total height is 1400mm, and UASB reaction zone height is 560mm, and the three-phase separation area height is 165mm, the anaerobic filter bed height is 420mm, cumulative volume 14L, device are installed in the water-bath, and temperature is controlled at 35 ± 1 ℃.By under meter control water inlet, with recycle pump control hydraulic detention time and water inlet upflow velocity.Gas production rate is measured by wet test meter through water-sealed drainage bottle.
3) Using Hybrid Biofilm Reactor art breading; The percolate of handling through the last step enters in the Using Hybrid Biofilm Reactor, and aeration mode is restricted aeration, and the settling time is 1 hour, and aeration speed is 160L/h, and aeration time is 6 hours,, the sludge concentration in the reactor should remain on 4g/L, and water temperature is controlled at 20 ℃.
In Using Hybrid Biofilm Reactor, add carrier filler (carrier filler: the place of production: the auspicious filler company limited that reaches of Yixing City, model: YCDT, title: 3 D elastic filler).
The result:
Effluent quality: greyish white, substantially tasteless, water outlet COD
CrConcentration is 130mg/L, and pH is 7.1, and ammonia nitrogen is 11mg/L, and TP is 0.8mg/L, and SS is 35mg/L.Processing efficiency is 95%.
Embodiment 2
Sample: get the somewhere percolate, water quality is: red-brown, and foul smelling, COD
CrConcentration is 4500mg/L, and pH is 6.8, and ammonia nitrogen is 310mg/L, and TP is 26mg/L, and SS is 380mg/L.
Treatment process:
1) pre-treatment: percolate stoste is diluted, make COD
CrConcentration is 1000mg/L, adds urea and potassium primary phosphate in percolate, and making the C of percolate: N: P is 280: 3: 1, and to adjust pH be 6, and temperature is controlled at 35 ± 5 ℃;
2) upflow type anaerobic mud multiple-hearth is handled: treated percolate enters in the upflow type anaerobic mud composite bed reactor, and hydraulic load is controlled at 8kg COD
Cr/ m
3D, hydraulic detention time are 8 hours, and basicity is at 1000mg/L in the controlling reactor, and voltaile fatty acid VFA is at 100mg/L;
Upflow type anaerobic mud composite bed reactor is with embodiment 1.
3) Using Hybrid Biofilm Reactor art breading; The percolate of handling through the last step enters in the Using Hybrid Biofilm Reactor, and aeration mode is restricted aeration, and the settling time is 0.5 hour, aeration speed is 150L/h, and aeration time is 5 hours, sludge concentration in the reactor should remain on 5g/L, and water temperature is controlled at 10 ℃.
In Using Hybrid Biofilm Reactor, add carrier filler (carrier filler: the place of production: the auspicious filler company limited that reaches of Yixing City, model: YCDT, title: 3 D elastic filler).
Result: effluent quality: greyish white, substantially tasteless, water outlet COD
CrConcentration is 165mg/L, and pH is 7.0, and ammonia nitrogen is 12mg/L, and TP is 1.2mg/L, and SS is 42mg/L.Processing efficiency is all 96%.
Embodiment 3
Sample: get certain and sentence the percolate in 5 years of operation, water quality is: black, and foul smelling, COD
CrConcentration is 6000mg/L, and pH is 6.8, and ammonia nitrogen is 400mg/L, and TP is 35mg/L, and SS is 510mg/L.
1) pre-treatment: percolate stoste is diluted, make COD
CrConcentration is 1200mg/L, adds urea and potassium primary phosphate in percolate, and making the C of percolate: N: P is 320: 7: 1, and to adjust pH be 8, and temperature is controlled at 35 ± 5 ℃;
2) upflow type anaerobic mud multiple-hearth is handled: treated percolate enters in the upflow type anaerobic mud composite bed reactor, and hydraulic load is controlled at 12kg COD
Cr/ m
3D, hydraulic detention time are 12 hours, and basicity is more than 3000mg/L in the controlling reactor, and voltaile fatty acid VFA is below 800mg/L;
Upflow type anaerobic mud composite bed reactor is with embodiment 1.
3) Using Hybrid Biofilm Reactor art breading; The percolate of handling through the last step enters in the Using Hybrid Biofilm Reactor, and aeration mode is restricted aeration, and the settling time is 1.5 hours, aeration speed is 170L/h, and aeration time is 7 hours, sludge concentration in the reactor should remain on 5g/L, and water temperature is controlled at 30 ℃.
In Using Hybrid Biofilm Reactor, add carrier filler (carrier filler: the place of production: the auspicious filler company limited that reaches of Yixing City, model: YCDT, title: 3 D elastic filler).
The result:
Effluent quality: greyish white, substantially tasteless, water outlet COD
CrConcentration is 200mg/L, and pH is 7.0, and ammonia nitrogen is 15mg/L, and TP is 1.5mg/L, and SS is 50mg/L.Processing efficiency is all 98%.
Claims (1)
1, a kind of rubbish leachate treatment method is characterized in that comprising the following steps:
1) pre-treatment: percolate stoste is diluted, add urea and potassium primary phosphate in percolate, making the C of percolate: N: P is 280～320: 3～7: 1, and to adjust pH be 6～8, temperature is controlled at 35 ± 5 ℃;
2) upflow type anaerobic mud multiple-hearth is handled: treated percolate enters in the upflow type anaerobic mud composite bed reactor, and hydraulic load is controlled at 8～12kg COD
Cr/ m
3D, hydraulic detention time are 8～12 hours, and basicity is at 1000～3000mg/L in the controlling reactor, and voltaile fatty acid VFA is at 100～800mg/L;
3) Using Hybrid Biofilm Reactor art breading: the percolate of handling through the last step enters in the Using Hybrid Biofilm Reactor, aeration mode is restricted aeration, settling time is 0.5～1.5 hour, aeration speed is 150～170L/h, aeration time is 5～7 hours, sludge concentration in the reactor should remain on 4～5g/L, and water temperature is controlled at 10～30 ℃.
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| CNA2008100118972A CN101314503A (en) | 2008-06-18 | 2008-06-18 | Processing method for garbage leachate |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101445294B (en) * | 2009-01-04 | 2010-12-01 | 上海大学 | A marsh gas preparation method of landfill leachate resources |
| CN101967029A (en) * | 2010-08-23 | 2011-02-09 | 武汉大学 | Method for treating ammonia nitrogen in garbage percolate by combining biological and chemical processes |
| CN101671095B (en) * | 2009-09-11 | 2012-01-25 | 宇星科技发展(深圳)有限公司 | Garbage leachate treatment technique |
| CN101665308B (en) * | 2009-09-11 | 2012-02-01 | 广州市市政工程设计研究院 | Method for advanced treatment of landfill leachate |
-
2008
- 2008-06-18 CN CNA2008100118972A patent/CN101314503A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101445294B (en) * | 2009-01-04 | 2010-12-01 | 上海大学 | A marsh gas preparation method of landfill leachate resources |
| CN101671095B (en) * | 2009-09-11 | 2012-01-25 | 宇星科技发展(深圳)有限公司 | Garbage leachate treatment technique |
| CN101665308B (en) * | 2009-09-11 | 2012-02-01 | 广州市市政工程设计研究院 | Method for advanced treatment of landfill leachate |
| CN101967029A (en) * | 2010-08-23 | 2011-02-09 | 武汉大学 | Method for treating ammonia nitrogen in garbage percolate by combining biological and chemical processes |
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Open date: 20081203 |