CN113860664A - Treatment process of leachate of refuse landfill - Google Patents
Treatment process of leachate of refuse landfill Download PDFInfo
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- CN113860664A CN113860664A CN202111302713.XA CN202111302713A CN113860664A CN 113860664 A CN113860664 A CN 113860664A CN 202111302713 A CN202111302713 A CN 202111302713A CN 113860664 A CN113860664 A CN 113860664A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/286—Anaerobic digestion processes including two or more steps
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a treatment process of leachate of a refuse landfill, which comprises the steps of firstly utilizing an adjusting tank to flexibly adjust the water quality and the water quantity, then flocculating and precipitating through a pretreatment tank, removing most impurities in the precipitated landfill leachate through a filter tank, then entering a biochemical treatment system for biochemical treatment, most of organic matters in the waste leachate are degraded, solid-liquid separation is carried out on the waste leachate after degradation treatment through an MBR membrane bioreactor, the separation water is deeply purified through a reverse osmosis system, the sludge generated by separation flows back to a biochemical treatment system to participate in biochemical treatment, the reverse osmosis system separates water into water reaching the standard and concentrated solution, in the process, the excess sludge produced by the biochemical treatment system is dehydrated and dried by the sludge treatment system and then treated, and the produced concentrated solution is treated by the concentrated solution treatment system and then discharged after reaching the standard; the whole treatment process ensures the efficient degradation of organic matters in the landfill leachate on the premise of reducing the production and operation cost.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a treatment process of leachate of a refuse landfill.
Background
The landfill leachate is high-concentration organic wastewater which is formed by deducting the saturated water holding capacity of garbage and a soil covering layer from water contained in the garbage in a garbage landfill, rain, snow and water entering the landfill and other water, and is directly discharged into the environment without being treated, and serious environmental pollution is caused.
The existing percolate treatment method has the following main problems:
(1) the treatment method comprises the following steps of ammonia stripping, biological treatment and biological aerated filter: the method for removing ammonia nitrogen mainly comprises the step of blowing air into the percolate under an alkaline condition to remove free ammonia gas in the percolate so as to achieve the aim of removing ammonia nitrogen. The method needs to adjust the pH value of the leachate to 10-11, so a large amount of alkali materials are needed, and the ammonia gas after stripping is not treated effectively, thereby causing secondary pollution to the atmosphere. Meanwhile, the energy consumption is high due to the consumption of a large amount of air.
(2) And (3) pure membrane treatment: the route adopts a disc reverse osmosis membrane to filter the percolate, and generally adopts secondary reverse osmosis. The process route completely abandons a biological treatment process which is a treatment process with good economic effect, and the leachate is only subjected to pure physical filtration, and pollutants are not removed, so that secondary pollution is inevitably generated, and the process is mainly reflected in generation of a large amount of concentrated solution.
(3) Membrane-bioreactor treatment: the membrane separation technology has little effect on high-concentration wastewater, the mold replacement cost is high, and ammonia nitrogen and COD can not be greatly degraded.
(4) Physical precipitation treatment, adding chemical agents: the method can degrade organic substances instantly, but has extremely poor treatment effect on high-concentration percolate, and causes secondary pollution due to more sludge.
Disclosure of Invention
The invention aims to provide a treatment process of leachate of a refuse landfill aiming at the defects of the prior art, and the specific scheme is as follows:
a treatment process of leachate of a refuse landfill comprises the following steps:
step one, conveying the landfill leachate to a regulating tank, and regulating the water quantity and the water quality in the regulating tank;
conveying the landfill leachate in the regulating tank to a pretreatment tank, and adding a flocculating agent or a coagulant aid into the pretreatment tank to perform flocculation precipitation on the landfill leachate;
step three, discharging the landfill leachate in the pretreatment tank into a biochemical treatment system for biochemical treatment after filtration treatment by a filter tank, wherein the biochemical treatment system comprises a primary denitrification tank, a primary nitrification tank, a middle sedimentation tank, a secondary denitrification tank and a secondary nitrification tank which are connected in sequence, a return pipe is arranged between the middle sedimentation tank and the primary denitrification tank as well as between the middle sedimentation tank and the primary nitrification tank, and a return pump is arranged on the return pipe and used for ensuring the content of active sludge in the primary denitrification tank and the primary nitrification tank;
performing solid-liquid separation on the landfill leachate treated by the biochemical treatment system through an MBR (membrane bioreactor), discharging the separated water into a reverse osmosis system for deep purification, and discharging the separated residues into a primary denitrification tank for use as activated sludge; discharging excess sludge generated by the biochemical treatment system into a sludge treatment system through a sludge pump and a corresponding pipeline for dehydration treatment, transporting dehydrated mud cakes to a landfill site for treatment, and discharging generated supernatant into a primary denitrification tank for secondary biochemical treatment;
and fifthly, dividing the water treated by the reverse osmosis system into a concentrated solution and standard water, discharging the concentrated solution into a concentrated solution treatment system for treatment and then discharging the standard water, wherein the standard water can be collected by a reuse water pool or directly discharged.
Based on the above, the sludge treatment system comprises a sludge storage tank for containing sludge and a screw press for dewatering the sludge in the sludge storage tank.
Based on the above, the pH value range of the landfill leachate in the step one is adjusted to 6-8.
Based on the above, the intermediate sedimentation tank is also provided with a water supply pipe extending to a water inlet of the cooling tower, a sludge pump is arranged on the water supply pipe, and a water outlet of the cooling tower extends to the second-stage denitrification tank through a water outlet pipe.
Compared with the prior art, the invention has outstanding substantive characteristics and remarkable progress, and particularly has the following advantages:
according to the invention, the water quality and the water quantity are flexibly regulated by using the regulating tank, then flocculation precipitation is carried out through the pretreatment tank, most impurities in the precipitated landfill leachate are removed by the filter tank and then enter the biochemical treatment system for biochemical treatment, most organic matters in the landfill leachate are degraded, solid-liquid separation is carried out on the landfill leachate after degradation treatment through the MBR membrane bioreactor, deep purification is carried out on the separated water through the reverse osmosis system, the sludge generated by separation flows back to the biochemical treatment system to participate in the biochemical treatment, the reverse osmosis system separates the water into standard-reaching water and concentrated solution, in the process, the residual sludge generated by the biochemical treatment system is dewatered and dried by the sludge treatment system and then is buried, and the generated concentrated solution is treated by the concentrated solution treatment system and then is discharged in standard; the whole treatment process ensures the efficient degradation of organic matters in the landfill leachate on the premise of reducing the production and operation cost, and has the advantage of environmental protection.
Drawings
FIG. 1 is a flow chart of the process for treating leachate from a landfill site of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail by the following embodiments.
Examples
As shown in fig. 1, the invention provides 1 a treatment process of landfill leachate, which is characterized by comprising the following steps:
step one, conveying the landfill leachate to a regulating tank, and regulating the water quantity and the water quality in the regulating tank;
conveying the landfill leachate in the regulating tank to a pretreatment tank, and adding a flocculating agent or a coagulant aid into the pretreatment tank to perform flocculation precipitation on the landfill leachate;
step three, discharging the landfill leachate in the pretreatment tank into a biochemical treatment system for biochemical treatment after filtration treatment by a filter tank, wherein the biochemical treatment system comprises a primary denitrification tank, a primary nitrification tank, a middle sedimentation tank, a secondary denitrification tank and a secondary nitrification tank which are connected in sequence, a return pipe is arranged between the middle sedimentation tank and the primary denitrification tank as well as between the middle sedimentation tank and the primary nitrification tank, and a return pump is arranged on the return pipe and used for ensuring the content of active sludge in the primary denitrification tank and the primary nitrification tank;
performing solid-liquid separation on the landfill leachate treated by the biochemical treatment system through an MBR (membrane bioreactor), discharging the separated water into a reverse osmosis system for deep purification, and discharging the separated residues into a primary denitrification tank for use as activated sludge; discharging excess sludge generated by the biochemical treatment system into a sludge treatment system through a sludge pump and a corresponding pipeline for dehydration treatment, transporting dehydrated mud cakes to a landfill site for treatment, and discharging generated supernatant into a primary denitrification tank for secondary biochemical treatment;
and fifthly, dividing the water treated by the reverse osmosis system into a concentrated solution and standard water, discharging the concentrated solution into a concentrated solution treatment system for treatment and then discharging the standard water, wherein the standard water can be collected by a reuse water pool or directly discharged.
The sludge treatment system comprises a sludge storage tank for containing sludge and a screw press for dewatering the sludge in the sludge storage tank. And the sludge after being pressed by the screw press can be conveyed to a landfill site for landfill treatment after being dried properly.
In order to ensure the biochemical treatment effect on the landfill leachate, the pH value of the landfill leachate in the step one is adjusted to 6-8.
In consideration of the problem that the activity of sludge in the landfill leachate is affected if the temperature of the landfill leachate is too high in the biochemical treatment process, the intermediate sedimentation tank is also provided with a water supply pipe extending to a water inlet of the cooling tower, a sludge pump is arranged on the water supply pipe, and a water outlet of the cooling tower extends to the secondary denitrification tank through a water outlet pipe.
According to the invention, the water quality and the water quantity are flexibly regulated by using the regulating tank, then flocculation precipitation is carried out through the pretreatment tank, most impurities in the precipitated landfill leachate are removed by the filter tank and then enter the biochemical treatment system for biochemical treatment, most organic matters in the landfill leachate are degraded, solid-liquid separation is carried out on the landfill leachate after degradation treatment through the MBR membrane bioreactor, deep purification is carried out on the separated water through the reverse osmosis system, the sludge generated by separation flows back to the biochemical treatment system to participate in the biochemical treatment, the reverse osmosis system separates the water into standard-reaching water and concentrated solution, in the process, the residual sludge generated by the biochemical treatment system is dewatered and dried by the sludge treatment system and then is buried, and the generated concentrated solution is treated by the concentrated solution treatment system and then is discharged in standard; the whole treatment process ensures the efficient degradation of organic matters in the landfill leachate on the premise of reducing the production and operation cost, and has the advantage of environmental protection.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (4)
1. A treatment process of leachate of a refuse landfill is characterized by comprising the following steps:
step one, conveying the landfill leachate to a regulating tank, and regulating the water quantity and the water quality in the regulating tank;
conveying the landfill leachate in the regulating tank to a pretreatment tank, and adding a flocculating agent or a coagulant aid into the pretreatment tank to perform flocculation precipitation on the landfill leachate;
step three, discharging the landfill leachate in the pretreatment tank into a biochemical treatment system for biochemical treatment after filtration treatment by a filter tank, wherein the biochemical treatment system comprises a primary denitrification tank, a primary nitrification tank, a middle sedimentation tank, a secondary denitrification tank and a secondary nitrification tank which are connected in sequence, a return pipe is arranged between the middle sedimentation tank and the primary denitrification tank as well as between the middle sedimentation tank and the primary nitrification tank, and a return pump is arranged on the return pipe and used for ensuring the content of active sludge in the primary denitrification tank and the primary nitrification tank;
performing solid-liquid separation on the landfill leachate treated by the biochemical treatment system through an MBR (membrane bioreactor), discharging the separated water into a reverse osmosis system for deep purification, and discharging the separated residues into a primary denitrification tank for use as activated sludge; discharging excess sludge generated by the biochemical treatment system into a sludge treatment system through a sludge pump and a corresponding pipeline for dehydration treatment, transporting dehydrated mud cakes to a landfill site for treatment, and discharging generated supernatant into a primary denitrification tank for secondary biochemical treatment;
and fifthly, dividing the water treated by the reverse osmosis system into a concentrated solution and standard water, discharging the concentrated solution into a concentrated solution treatment system for treatment and then discharging the standard water, wherein the standard water can be collected by a reuse water pool or directly discharged.
2. The process for treating leachate in a landfill site of claim 1, wherein the treatment process comprises the following steps: the sludge treatment system comprises a sludge storage tank for containing sludge and a screw press for dewatering the sludge in the sludge storage tank.
3. The process for treating leachate in a landfill site of claim 1, wherein the treatment process comprises the following steps: and in the first step, the PH value range of the landfill leachate is adjusted to 6-8.
4. The process for treating leachate in a landfill site of claim 1, wherein the treatment process comprises the following steps: the intermediate sedimentation tank is also provided with a water supply pipe extending to a water inlet of the cooling tower, the water supply pipe is provided with a sludge pump, and a water outlet of the cooling tower extends to the second-stage denitrification tank through a water outlet pipe.
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| CN202111302713.XA CN113860664A (en) | 2021-11-05 | 2021-11-05 | Treatment process of leachate of refuse landfill |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101357812A (en) * | 2007-07-31 | 2009-02-04 | 深圳百斯特环保工程有限公司 | Processing method for domestic garbage leachate |
| CN101357813A (en) * | 2007-07-31 | 2009-02-04 | 深圳百斯特环保工程有限公司 | Processing method for domestic garbage leachate |
| 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 |
| CN102001786A (en) * | 2010-10-22 | 2011-04-06 | 中国瑞林工程技术有限公司 | New high-nitrogen organic sewage treatment biochemical denitrification process |
| CN102351382A (en) * | 2011-09-06 | 2012-02-15 | 北京昊业怡生科技有限公司 | Combined treatment method of leachate and excrement wastewater |
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| CN104478175A (en) * | 2014-12-24 | 2015-04-01 | 北京桑德环境工程有限公司 | Treatment system and method for biogas slurry produced from anaerobic fermentation of kitchen waste |
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| CA3088187A1 (en) * | 2019-11-18 | 2020-11-09 | Ziolase, Llc | Compositions and methods to prevent and treat biofilms |
-
2021
- 2021-11-05 CN CN202111302713.XA patent/CN113860664A/en active Pending
Patent Citations (9)
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| CN101357812A (en) * | 2007-07-31 | 2009-02-04 | 深圳百斯特环保工程有限公司 | Processing method for domestic garbage leachate |
| CN101357813A (en) * | 2007-07-31 | 2009-02-04 | 深圳百斯特环保工程有限公司 | Processing method for domestic garbage leachate |
| 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 |
| CN102001786A (en) * | 2010-10-22 | 2011-04-06 | 中国瑞林工程技术有限公司 | New high-nitrogen organic sewage treatment biochemical denitrification process |
| CN102351382A (en) * | 2011-09-06 | 2012-02-15 | 北京昊业怡生科技有限公司 | Combined treatment method of leachate and excrement wastewater |
| CN102417260A (en) * | 2011-10-14 | 2012-04-18 | 黄庆茹 | Treating method for landfill leachate |
| CN104478175A (en) * | 2014-12-24 | 2015-04-01 | 北京桑德环境工程有限公司 | Treatment system and method for biogas slurry produced from anaerobic fermentation of kitchen waste |
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Application publication date: 20211231 |