CN105152485A - Treatment process for leachate of municipal refuse landfill - Google Patents

Treatment process for leachate of municipal refuse landfill Download PDF

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Publication number
CN105152485A
CN105152485A CN201510586718.8A CN201510586718A CN105152485A CN 105152485 A CN105152485 A CN 105152485A CN 201510586718 A CN201510586718 A CN 201510586718A CN 105152485 A CN105152485 A CN 105152485A
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China
Prior art keywords
treatment
enters
sludge
percolate
mud
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CN201510586718.8A
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Chinese (zh)
Inventor
宋岱峰
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CHENGDU MFT MEMBRANE TECHNOLOGY Co Ltd
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CHENGDU MFT MEMBRANE TECHNOLOGY Co Ltd
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Priority to CN201510586718.8A priority Critical patent/CN105152485A/en
Publication of CN105152485A publication Critical patent/CN105152485A/en
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Abstract

The invention discloses a treatment process for leachate of a municipal refuse landfill. The treatment process comprises the steps of collecting to centralize refuse leachate; firstly, carrying out primary anaerobic treatment by using UASB (upflow anaerobic sludge blanket); then, carrying out nitration reaction in an A-section anaerobic tank to remove a great number of suspended matters and ammonia nitrogen; then, carrying out aerobic biochemical treatment and denitrification reaction by using an MBR membrane biochemical reactor to remove most of organic pollutants and COD, and sufficiently removing water entering a SuperRO system in a regulating tank; and finally, carrying out advanced treatment by using the SuperRO system to ensure that effluent reaches the standard. The process is relatively simple, the cost is easily controlled, a membrane system is not easily blocked by pollutants, the stability of the system is better, and the treatment process is particularly suitable for treating the leachate of the refuse landfill; in addition, the treatment process is novel in concept, artful in design, simple, easy to use, wide in application prospect and suitable for popularization and application.

Description

For the percolate treating process of city refuse landfill
Technical field
The present invention relates to dirty useless processing technology field, specifically, what relate to is a kind of percolate treating process for city refuse landfill.
Background technology
The typical feature of domestic rubbish is that kitchen residue content is high, water ratio is high, organic content is high, mixed collection, and relative calorific value is lower.Therefore, in domestic Design of Waste Landfill Site, the storage volume of refuse chute is the garbage treatment quantity of 3-7 days; Namely rubbish stores the fermentation slaking through 3-7 days in refuse chute, is gone out by the moisture content drop in rubbish, so create percolate to reach.This leachate quality is not up to standard, directly to environmental emission by contaminate environment, therefore must process it.The generation of garbage filter liquid measure is subject to the impact of many factors, and not only water yield change greatly, and its change is in obvious aperiodicity.Throwing in and receive fortune process due to rubbish is all a unlimited operating system, thus the generation climate of percolate and the impact of seasonal variation very obvious.Known through investigation and analysis, the characteristic of percolate is specific as follows:
1) organic contamination substrate concentration height complicated component
Percolate belongs to high concentrated organic wastewater.Cod codcr concentration range 5000 ~ 10000mg/L in generalized case city garbage percolate, biological oxygen demand (BOD) BOD5 concentration range 1000 ~ 4000mg/L, simultaneously also containing gas chromatography and inorganics (containing poisonous and harmful element), thus its water quality is quite complicated, pollutant kind is many, and concentration exists the complicacy of short-term fluctuation and secular variation.
2) change of water quality is large
The change of BOD5/CODcr ratio is large.The rubbish major part of new operation refuse landfill is the domestic refuse than comparatively fresh, and BOD5/CODcr value is comparatively large, and that is degradable organism is more.Along with the increase in storage time, BOD5/CODcr value has the trend diminished, and for the refuse landfill that working time is longer, leachate quality fluctuation is larger.
3) ammonia nitrogen concentration is high
The ammonia nitrogen of percolate middle and high concentration is the major reason causing intractability to increase.The ammonia nitrogen of high density and over time, has not only increased the weight of the pollution level of receiving water body, has brought difficulty also to the selection for the treatment of process, add complicacy.Too high ammonia nitrogen requires to carry out denitrogenation processing, and the result of process makes the C/N value in water lower, suppresses the carrying out of conventional biological treatment conversely.
4) good biodegradability
The BOD5/CODcr of percolate is more than 0.3, belongs to the sewage of biodegradability.
5) nutritive element is out of proportion
In conventional rubbish percolate, BOD5/TP is mostly greater than 300, differs comparatively large, therefore carry out the BOD5 in degrading waste water according to biochemical system, in sewage disposal, lack phosphoric with the phosphoric needed for microorganism growth, needs in addition supply.On the other hand, the ammonia-nitrogen content in percolate is usually higher, should consider the problem such as basicity in water simultaneously.
6) specific conductivity is high, salt content is high
Percolate is usually containing a large amount of salts, total saltiness, usually up to more than 10000mg/L, adopts film process producing water ratio can be caused too low because osmotic pressure is excessive, adopts biochemical treatment can cause difficulty in starting because saltiness is too high, run unstable, even cannot run.
Summary of the invention
For overcoming the problems referred to above that prior art exists, the invention provides a kind of percolate treating process for city refuse landfill that efficiently, not easily dirt is stifled, long service life, cost easy to use are low.
To achieve these goals, the technical solution used in the present invention is as follows:
For a percolate treating process for city refuse landfill, comprise the steps:
(1) percolate is introduced in collecting tank assemble;
(2) percolate is passed into upflow type anaerobic bio-reactor and carry out anaerobic biochemical treatment, the mud of generation enters sludge thickener;
(3) water outlet of upflow type anaerobic bio-reactor enters A section anaerobic pond and carries out nitration reaction, removes BOD;
(4) water outlet of A section anaerobic pond enters MBR me.mbrane bioreactor and carries out aerobic treatment and anti-nitration reaction, and its partial sludge is back to A section anaerobic pond, and excess sludge enters sludge thickener;
(5) water outlet of MBR me.mbrane bioreactor enters equalizing tank and carries out sedimentation and filtration, and regulates pH by adding HCl;
(6) water outlet of equalizing tank enters SuperRO system, and after SuperRO film device filters, its dense water section recharges landfill yard, and it produces after water adds NaOH adjustment pH and enters clean water basin;
(7) mud that the mud that produced by upflow type anaerobic bio-reactor of sludge thickener and MBR me.mbrane bioreactor produce concentrates further, and supernatant liquor is back to collecting tank, the mud input sludge filter press process after concentrated;
(8) described sludge filter press carries out processed, filtrate backflow input collecting tank, the mud cake landfill disposal of generation to the mud after concentrated.
Particularly, in described step (3), in A section anaerobic pond, add starch promote nitration reaction.
Particularly, air is passed into by aeration mode when MBR me.mbrane bioreactor carries out aerobic treatment in described step (4).
Particularly, the COD clearance after described MBR me.mbrane bioreactor is at least 70%, and ammonia nitrogen removal frank is at least 90%.
Particularly, in described step (6), the clearance of SuperRO system to COD is at least 95%, is at least 90% to the clearance of ammonia nitrogen.
Particularly, in described step (8), sludge filter press is chamber-type press filter.
Compared with prior art, the present invention has following beneficial effect:
Percolate is concentrated by collecting tank by the present invention, the anaerobic treatment of just section is first carried out by UASB (upflowanaerobicsludgeblanket), nitration reaction in A section anaerobic pond again, remove a large amount of suspended substance and ammonia nitrogen, then aerobic treatment and anti-nitration reaction is carried out by MBR me.mbrane bioreactor, remove most organic pollutant and COD, and sufficient removal is done in the water inlet for SuperRO system in equalizing tank, the advanced treatment eventually passing SuperRO system makes standard water discharge, process is relatively simple, cost easily controls, and membranous system is not easily blocked up by dirt, system stability is better, be particularly suitable for the percolate process of refuse landfill, and the present invention is novel, design ingenious, be simple and easy to use, be with a wide range of applications, be applicable to applying.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described, and embodiments of the present invention include but not limited to the following example.
Embodiment
As shown in Figure 1, this is used for the percolate treating process of city refuse landfill, comprises the steps:
(1) percolate is introduced in collecting tank assemble;
(2) percolate is passed into upflow type anaerobic bio-reactor and carry out anaerobic biochemical treatment, the mud of generation enters sludge thickener;
This upflow type anaerobic bio-reactor (UASB, upflowanaerobicsludgeblanket) is made up of reaction zone, settling region and air chamber three part.Be the sludge blanket that concentration is higher in the bottom of reactor, claim Sludge Bed, be the suspended sludge layer that relative concentration is lower on Sludge Bed top, sludge blanket and suspended layer are referred to as reaction zone, are provided with gas, liquid, solid triphase separator on top, reaction zone.Waste water enters bottom Sludge Bed, carries out mixing contact with the mud in Sludge Bed, and the organism in microbial decomposition waste water produces biogas, and small biogas bubble is in uphill process, and continuous merging forms larger bubble gradually.Produce stronger stirring because bubble rises, form suspended sludge layer on Sludge Bed top.The mixed solution of gas, water, mud rises in triphase separator, when biogas bubble encounters the reflector of separator bottom, is folded to air chamber and is effectively separated discharge; Mud and water then enter the settling region of triphase separator through duct, under gravity, supernatant liquor is discharged from top, settling region, and the mud of bottom, settling region turns back to reaction zone along skew wall.Under certain hydraulic load, most mud granule can be retained in reaction zone, makes reaction zone have enough sludge quantities.
(3) water outlet of upflow type anaerobic bio-reactor enters A section anaerobic pond and adds starch and carries out nitration reaction, removes BOD;
(4) water outlet of A section anaerobic pond enters MBR me.mbrane bioreactor and passes into air by aeration mode and carries out aerobic treatment and anti-nitration reaction, and its partial sludge is back to A section anaerobic pond, and excess sludge enters sludge thickener; Now, COD clearance is at least 70%, and ammonia nitrogen removal frank is at least 90%;
(5) water outlet of MBR me.mbrane bioreactor enters equalizing tank and carries out sedimentation and filtration, and regulates pH by adding HCl;
(6) water outlet of equalizing tank enters SuperRO system, and after SuperRO film device filters, be at least 95% to the clearance of COD, be at least 90% to the clearance of ammonia nitrogen, its dense water section recharges landfill yard, and it produces after water adds NaOH adjustment pH and enters clean water basin;
(7) mud that the mud that produced by upflow type anaerobic bio-reactor of sludge thickener and MBR me.mbrane bioreactor produce concentrates further, and supernatant liquor is back to collecting tank, the mud input sludge filter press process after concentrated;
(8) described sludge filter press carries out processed to the mud after concentrated, and filtrate backflow input collecting tank, the mud cake landfill disposal of generation, described sludge filter press is chamber-type press filter.
The equipment used in the present invention and system are prior art, repeat no more.
Carry out water treatment experiment of the present invention in certain refuse landfill, the effluent quality test rating of acquisition is as shown in table 1 below:
Ammonia nitrogen ≤25mg/L
COD ≤100mg/L
SS ≤30mg/L
PH 6-9
Table 1
Known by testing, the present invention has excellent effect on the treatment effect of percolate.
Above-described embodiment is only the preferred embodiments of the present invention, not limiting the scope of the invention, as long as adopt principle of design of the present invention, and the change carried out non-creativeness work on this basis and make, all should belong within protection scope of the present invention.

Claims (6)

1. for a percolate treating process for city refuse landfill, it is characterized in that, comprise the steps:
(1) percolate is introduced in collecting tank assemble;
(2) percolate is passed into upflow type anaerobic bio-reactor and carry out anaerobic biochemical treatment, the mud of generation enters sludge thickener;
(3) water outlet of upflow type anaerobic bio-reactor enters A section anaerobic pond and carries out nitration reaction, removes BOD;
(4) water outlet of A section anaerobic pond enters MBR me.mbrane bioreactor and carries out aerobic treatment and anti-nitration reaction, and its partial sludge is back to A section anaerobic pond, and excess sludge enters sludge thickener;
(5) water outlet of MBR me.mbrane bioreactor enters equalizing tank and carries out sedimentation and filtration, and regulates pH by adding HCl;
(6) water outlet of equalizing tank enters SuperRO system, and after SuperRO film device filters, its dense water section recharges landfill yard, and it produces after water adds NaOH adjustment pH and enters clean water basin;
(7) mud that the mud that produced by upflow type anaerobic bio-reactor of sludge thickener and MBR me.mbrane bioreactor produce concentrates further, and supernatant liquor is back to collecting tank, the mud input sludge filter press process after concentrated;
(8) described sludge filter press carries out processed, filtrate backflow input collecting tank, the mud cake landfill disposal of generation to the mud after concentrated.
2. the percolate treating process for city refuse landfill according to claim 1, is characterized in that, in described step (3), adds starch and promote nitration reaction in A section anaerobic pond.
3. the percolate treating process for city refuse landfill according to claim 1, is characterized in that, passes into air when MBR me.mbrane bioreactor carries out aerobic treatment in described step (4) by aeration mode.
4. the percolate treating process for city refuse landfill according to claim 3, is characterized in that, the COD clearance after described MBR me.mbrane bioreactor is at least 70%, and ammonia nitrogen removal frank is at least 90%.
5. the percolate treating process for city refuse landfill according to claim 4, is characterized in that, in described step (6), the clearance of SuperRO system to COD is at least 95%, is at least 90% to the clearance of ammonia nitrogen.
6. the percolate treating process for city refuse landfill according to claim 1, is characterized in that, in described step (8), sludge filter press is chamber-type press filter.
CN201510586718.8A 2015-09-16 2015-09-16 Treatment process for leachate of municipal refuse landfill Pending CN105152485A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107244776A (en) * 2017-05-25 2017-10-13 成都美富特膜科技有限公司 A kind of handling process of percolate

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101811796A (en) * 2009-12-23 2010-08-25 中国船舶重工集团公司第七一八研究所 Method for treating leachate
CN101870543A (en) * 2010-07-14 2010-10-27 柳州森淼环保技术开发有限公司 Landfill percolate treatment novel process
CA2774695A1 (en) * 2009-10-09 2011-04-14 Chiyoda Corporation Method of treating a plant wastewater and treatment system therefor
CN104129882A (en) * 2014-08-25 2014-11-05 成都美富特膜科技有限公司 Novel treatment technology of high-concentration industrial wastewater

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2774695A1 (en) * 2009-10-09 2011-04-14 Chiyoda Corporation Method of treating a plant wastewater and treatment system therefor
CN101811796A (en) * 2009-12-23 2010-08-25 中国船舶重工集团公司第七一八研究所 Method for treating leachate
CN101870543A (en) * 2010-07-14 2010-10-27 柳州森淼环保技术开发有限公司 Landfill percolate treatment novel process
CN104129882A (en) * 2014-08-25 2014-11-05 成都美富特膜科技有限公司 Novel treatment technology of high-concentration industrial wastewater

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107244776A (en) * 2017-05-25 2017-10-13 成都美富特膜科技有限公司 A kind of handling process of percolate

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