CN114573180A - Standard treatment process for landfill leachate - Google Patents

Standard treatment process for landfill leachate Download PDF

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Publication number
CN114573180A
CN114573180A CN202011291951.0A CN202011291951A CN114573180A CN 114573180 A CN114573180 A CN 114573180A CN 202011291951 A CN202011291951 A CN 202011291951A CN 114573180 A CN114573180 A CN 114573180A
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tank
enters
stage
water
aerobic
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CN202011291951.0A
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Chinese (zh)
Inventor
孟繁明
曾明
郭庆贺
沈军彦
韩爱龙
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Beijing Crystec Technologies Co ltd
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Beijing Crystec Technologies Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/28Treatment of water, waste water, or sewage by sorption
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/70Treatment of water, waste water, or sewage by reduction
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/72Treatment of water, waste water, or sewage by oxidation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/72Treatment of water, waste water, or sewage by oxidation
    • C02F1/725Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/72Treatment of water, waste water, or sewage by oxidation
    • C02F1/78Treatment of water, waste water, or sewage by oxidation with ozone
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F2001/007Processes including a sedimentation step
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/20Heavy metals or heavy metal compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • C02F2101/34Organic compounds containing oxygen
    • C02F2101/345Phenols
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • C02F2101/36Organic compounds containing halogen
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • C02F2101/40Organic compounds containing sulfur
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06Contaminated groundwater or leachate
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/04Disinfection
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/02Aerobic processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/28Anaerobic digestion processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/302Nitrification and denitrification treatment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/34Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Abstract

The invention provides a standard-reaching treatment process for landfill leachate, which belongs to the technical field of wastewater treatment and is characterized in that the landfill leachate sequentially passes through a regulating tank, a micro-electrolysis reactor, a neutralization coagulation flocculation sedimentation tank, an ozone catalytic oxidizer, a two-stage A/O biochemical treatment tank, a secondary sedimentation tank, an aeration biological filter and a disinfection tank and then is discharged after reaching the standard. The invention has the advantages of high treatment effect, no generation of concentrated water, stable and reliable operation, low investment and operation cost and the like.

Description

Standard treatment process for landfill leachate
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a standard treatment process for landfill leachate.
Background
Urban garbage is a great problem in urban environment management. Landfill leachate in refuse transfer stations, incineration sites or landfill sites is generated from various compounds and rotten substances, contains BOD, COD, nitrogen-containing compounds, phosphorus-containing compounds, organic halides, sulfides, inorganic salts and the like with extremely high concentration, and is not only smelly but also a few carcinogens.
The landfill leachate is high-concentration organic wastewater which has complex components and large change of water quality and water quantity and has the following main characteristics: the concentration of pollutants is high; the content of organic pollutants is high, and the components are complex; the proportion of the microorganism nutrient elements in the percolate is seriously disordered; the water quality changes greatly; the metal content is higher.
The difficulty of landfill leachate treatment is also manifested by its variability: the production amount changes seasonally, and the rainy season is obviously larger than the dry season; the pollutant composition changes seasonally, and the pollutant composition and concentration in the leachate in dry and cold seasons of the landfill in plain areas are low; the pollutant composition and its concentration vary with the age of the landfill.
The landfill leachate contains more organic pollutants, up to 77, and 5 carcinogens and auxiliary carcinogens. Landfill leachate contains more than 10 metal ions, and the metal ions can have serious inhibition effect on the biological treatment process. The difficulty of handling is very great.
At present, the whole-flow treatment method of landfill leachate is mostly double-membrane treatment (MBR + NF/RO), and the outstanding problems are as follows: 1. the pretreatment is not ideal, so that the biochemical effect is extremely poor; 2. the NF/RO membrane is quickly blocked, and the generated concentrated water is not removed, so that the dead circulation is caused.
Disclosure of Invention
The invention aims to provide a standard treatment process for landfill leachate, which does not adopt a membrane method, has low investment and operation cost and good treatment effect, aiming at the defects of high investment and operation cost, further treatment of generated concentrated water and the like in the current landfill leachate treatment process.
In order to achieve the purpose, the standard treatment process of the landfill leachate provided by the invention comprises the following process steps: (1) the landfill leachate firstly enters an adjusting tank, and the water quantity is stored and adjusted; (2) the water in the regulating reservoir enters a micro-electrolysis reactor for high-efficiency pretreatment, phenol, chlorinated organic matters, organic sulfides, heavy metal ions and the like in the wastewater can be decomposed and removed, favorable conditions are created for the high-efficiency and stable operation of a back-stage biochemical system, and meanwhile, COD in the raw water is greatly degraded, and the water inlet load is reduced; (3) the water passing through the micro-electrolysis reactor enters a neutralization coagulation flocculation sedimentation tank, and the biodegradability of the wastewater is improved after pollutants such as heavy metal ions, organic sulfides difficult to biochemical development, indole, benzene series (aromatic organic matters) and the like in the wastewater are removed or decomposed simultaneously through the processes of oxidation-reduction-coagulation adsorption-flocculation-sedimentation; (4) the water treated by the neutralization coagulation flocculation sedimentation tank enters an ozone catalytic oxidation device, and the organic matters difficult to degrade are further subjected to oxidative decomposition by utilizing the strong oxidizing property of ozone and the high-efficiency catalytic activity of a catalyst; (5) the water after the ozone catalytic oxidation reactor treatment enters a two-stage A/O biochemical reaction tank, the first stage A/O is anaerobic/aerobic biochemical treatment, combined filler is arranged in the anaerobic tank, suspended filler is arranged in the first stage aerobic tank, the wastewater is subjected to hydrolysis-acidification in the anaerobic tank, long-chain macromolecular organic pollutants are degraded into small molecular compounds which are easy to decompose and utilize by aerobic microorganisms, metabolism is performed by a large amount of microorganisms attached to the surface of the filler in the first stage aerobic tank under the condition of sufficient aeration and oxygenation, organic matters are decomposed, and the wastewater is purified. The second-stage A/O is anoxic/aerobic treatment, the effluent of the first-stage aerobic tank enters an anoxic tank, combined filler is arranged in the anoxic tank, the denitrification effect of converting nitrate nitrogen in the wastewater into nitrogen in the anoxic tank is better, the effluent of the anoxic tank enters a second-stage aerobic tank, suspended filler is arranged in the second-stage aerobic tank, COD and ammonia nitrogen are further removed through biological contact oxidation reaction, and the ammonia nitrogen is converted into nitro nitrogen after being oxidized by nitrifying bacteria; (6) the water treated by the two-stage A/O biochemical reaction tank enters a secondary sedimentation tank for mud-water separation, part of sludge flows back to the anoxic tank, and the rest sludge is periodically discharged to a sludge concentration tank; (7) the water treated by the secondary sedimentation tank enters an aeration biological filter and is further treated by microorganisms; (8) the water treated by the biological aerated filter enters a disinfection tank, and the water after disinfection is discharged after reaching the standard; (9) and (4) dehydrating the sludge in the sludge concentration tank and returning the sludge to the refuse landfill.
Compared with the prior art, the invention has the following advantages:
1. low investment and operation cost
2. Without concentrated water, without further treatment
3. The operation is stable, and the water quality of the produced water is good.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The present invention will be described in detail below with reference to examples and the accompanying drawings.
Embodiment 1, the standard treatment process of landfill leachate of this embodiment sequentially includes the following steps: (1) the landfill leachate firstly enters an adjusting tank, and the water quantity is stored and adjusted; (2) water in the regulating reservoir enters a micro-electrolysis reactor for high-efficiency pretreatment; (3) the water treated by the micro-electrolysis reactor enters a neutralization coagulation flocculation sedimentation tank, and the biodegradability of the wastewater is improved through the processes of oxidation-reduction-coagulation adsorption-flocculation-sedimentation; (4) the water treated by the neutralization coagulation flocculation sedimentation tank enters an ozone catalytic oxidation device, and the organic matters difficult to degrade are further subjected to oxidative decomposition by utilizing the strong oxidizing property of ozone and the high-efficiency catalytic activity of a catalyst; (5) the water treated by the ozone catalytic oxidation reactor enters a two-stage A/O biochemical reaction tank, the first stage A/O is anaerobic/aerobic biochemical treatment, the second stage A/O is anoxic/aerobic treatment, combined fillers are arranged in the anaerobic tank and the anoxic tank, and suspended fillers are arranged in the first stage aerobic tank and the second stage aerobic tank; (6) the water treated by the two-stage A/O biochemical reaction tank enters a secondary sedimentation tank for mud-water separation, part of sludge flows back to the anoxic tank, and the rest sludge is periodically discharged to a sludge concentration tank; (7) the water treated by the secondary sedimentation tank enters an aeration biological filter for advanced treatment of microorganisms; (8) the water treated by the aeration biological filter enters a disinfection tank, and the water after disinfection treatment reaches the standard and is discharged; (9) and (4) dehydrating the sludge in the sludge concentration tank and returning the sludge to the refuse landfill.
The beneficial effects of the invention include: (1) the investment and operation cost is low; (2) no concentrated water exists, and no secondary pollution is generated; (3) the operation is stable, and the water quality of the produced water is good.

Claims (2)

1. A standard treatment process for landfill leachate is characterized by comprising the following steps:
(1) the landfill leachate firstly enters an adjusting tank, and the water quantity is stored and adjusted;
(2) water in the regulating reservoir enters a micro-electrolysis reactor for high-efficiency pretreatment;
(3) the water passing through the micro-electrolysis reactor enters a neutralization coagulation flocculation sedimentation tank, and the biodegradability of the wastewater is improved after pollutants such as heavy metal ions, organic sulfides difficult to biochemical development, indole, benzene series (aromatic organic matters) and the like in the wastewater are removed or decomposed simultaneously through the processes of oxidation-reduction-coagulation adsorption-flocculation-sedimentation;
(4) the water treated by the neutralization coagulation flocculation sedimentation tank enters an ozone catalytic oxidation device, and the organic matters difficult to degrade are further subjected to oxidative decomposition by utilizing the strong oxidizing property of ozone and the high-efficiency catalytic activity of a catalyst;
(5) the water treated by the ozone catalytic oxidation reactor enters a two-stage A/O biochemical reaction tank, wherein the first stage A/O is anaerobic/aerobic biochemical treatment, long-chain macromolecular organic pollutants are degraded into small molecular compounds which are easy to decompose and utilize by aerobic microorganisms in the anaerobic tank, a large amount of microorganisms attached to the surface of a filler are utilized to carry out metabolism in the first stage aerobic tank under the condition of full aeration and oxygenation to decompose organic matters, the wastewater is purified, the second stage A/O is anoxic/aerobic treatment, the effluent of the first stage aerobic tank enters an anoxic tank, the denitrification effect of converting nitrate nitrogen in the wastewater into nitrogen in the anoxic tank is good, and the effluent of the anoxic tank enters the second stage aerobic tank;
(6) the water treated by the two-stage A/O biochemical reaction tank enters a secondary sedimentation tank for mud-water separation, part of sludge flows back to the anoxic tank, and the rest sludge is periodically discharged to a sludge concentration tank;
(7) the water treated by the secondary sedimentation tank enters an aeration biological filter and is further treated by microorganisms;
(8) the water treated by the biological aerated filter enters a disinfection tank, and the water after disinfection is discharged after reaching the standard;
(9) and (4) dehydrating the sludge in the sludge concentration tank and returning the sludge to the refuse landfill.
2. The standard-reaching treatment process for landfill leachate of claim 1, wherein the standard-reaching treatment process comprises the following steps: and combined fillers are arranged in the anaerobic tank and the anoxic tank of the two-stage A/O reaction tank, and suspended fillers are arranged in the first-stage aerobic tank and the second-stage aerobic tank.
CN202011291951.0A 2020-11-18 2020-11-18 Standard treatment process for landfill leachate Withdrawn CN114573180A (en)

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CN114573180A true CN114573180A (en) 2022-06-03

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013010388A1 (en) * 2011-07-21 2013-01-24 波鹰(厦门)科技有限公司 Apparatus for treating landfill leachate and treatment method therefor
CN105540992A (en) * 2015-11-20 2016-05-04 湖北科亮生物环保科技有限公司 Landfill leachate treatment technology
CN110759603A (en) * 2019-11-26 2020-02-07 广州桑尼环保科技有限公司 Method for treating landfill leachate by non-membrane method
CN211198962U (en) * 2019-11-26 2020-08-07 广州桑尼环保科技有限公司 Non-membrane method landfill leachate treatment system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013010388A1 (en) * 2011-07-21 2013-01-24 波鹰(厦门)科技有限公司 Apparatus for treating landfill leachate and treatment method therefor
CN105540992A (en) * 2015-11-20 2016-05-04 湖北科亮生物环保科技有限公司 Landfill leachate treatment technology
CN110759603A (en) * 2019-11-26 2020-02-07 广州桑尼环保科技有限公司 Method for treating landfill leachate by non-membrane method
CN211198962U (en) * 2019-11-26 2020-08-07 广州桑尼环保科技有限公司 Non-membrane method landfill leachate treatment system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
曾郴林,刘情生: "《微电解法处理难降解有机废水的理论与实例分析》", 中国环境出版社 *

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Application publication date: 20220603