CN113480086A - Comprehensive treatment system and process for landfill leachate - Google Patents

Comprehensive treatment system and process for landfill leachate Download PDF

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Publication number
CN113480086A
CN113480086A CN202110639338.1A CN202110639338A CN113480086A CN 113480086 A CN113480086 A CN 113480086A CN 202110639338 A CN202110639338 A CN 202110639338A CN 113480086 A CN113480086 A CN 113480086A
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landfill leachate
tank
landfill
damo
reaction
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胡振
张雪
张建
吴世博
谢慧君
梁爽
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Shandong University
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Shandong University
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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
    • 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
    • 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
    • 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
    • C02F1/5281—Installations for water purification using chemical agents
    • 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
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/722—Oxidation by peroxides
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/026—Fenton's reagent
    • 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
    • C02F3/2853—Anaerobic digestion processes using anaerobic membrane bioreactors
    • 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
    • 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
    • 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
    • C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Removal Of Specific Substances (AREA)

Abstract

The utility model belongs to the technical field of landfill leachate handles, concretely relates to landfill leachate comprehensive treatment system and technology, include: along the flowing direction of the landfill leachate, an acidification tank, a fluidized bed Fenton oxidation tower, an AO nitrosation reaction tank, a DAMO reactor and an artificial wetland are sequentially arranged. The carbon-nitrogen ratio and biodegradability of the landfill leachate are improved by adopting a Fenton advanced oxidation technology, AO nitrosation reaction and anaerobic methane oxidation (DAMO) reaction are combined, pollutants in the landfill leachate are removed, meanwhile, the landfill gas is recycled, the use of an external carbon source is reduced, and the landfill leachate is further desalted and deeply purified by adopting a composite artificial wetland based on Capacitive Deionization (CDI) after biological denitrification.

Description

Comprehensive treatment system and process for landfill leachate
Technical Field
The disclosure belongs to the technical field of landfill leachate treatment, and particularly relates to a comprehensive treatment system and process for landfill leachate.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The landfill leachate is high-concentration organic wastewater generated after the water, rainwater and the like of the garbage per se permeate a landfill layer through various biochemical reactions after the garbage is buried. The landfill leachate contains various toxic and harmful substances, including a large amount of refractory 'three-cause' organic matters, and the concentration of ammonia nitrogen is as high as 1000-4000 mg/L; and the water quality of the landfill leachate is greatly influenced by the landfill time, seasons and the like, and generally, along with the increase of the landfill age, the ammonia nitrogen concentration of the landfill leachate is increased, the COD concentration is reduced, so that the carbon-nitrogen ratio and the biodegradability are gradually reduced, and the biochemical treatment is difficult.
In the solid waste landfill process, microorganisms decompose organic matters in the solid waste to generate landfill gas, and the volume ratio of methane in the landfill gas is about 30-55%. Because the content of methane in the landfill gas is low, the output changes greatly along with seasons, landfill time and the like, the landfill gas is difficult to recycle, and the methane is usually subjected to combustion treatment after collection, so that the waste of resources is caused.
The bottleneck of the current landfill leachate treatment mainly contains a large amount of toxic and harmful refractory organic matters, has poor biodegradability, adopts the traditional nitrification and denitrification biological denitrification, usually needs an additional carbon source, has high treatment cost, and limits the treatment process by high-concentration ammonia nitrogen to influence the treatment effect. Therefore, the biodegradability and the denitrification effect of the landfill leachate are improved, the resource utilization rate in the treatment process is improved, the energy consumption is reduced, and meanwhile, the recovery of landfill gas and the like are still difficult to treat.
Disclosure of Invention
In order to solve the problems, the present disclosure provides a landfill leachate comprehensive treatment system and process, based on the treatment system, the refractory organic matters in the landfill leachate can be effectively degraded, the carbon-nitrogen ratio and biodegradability are improved, the denitrification effect is improved, and the use of an external carbon source is reduced.
Specifically, the technical scheme of the present disclosure is as follows:
in a first aspect of the present disclosure, a landfill leachate comprehensive treatment system includes: along the flowing direction of the landfill leachate, an acidification tank, a fluidized bed Fenton oxidation tower, an AO nitrosation reaction tank, a DAMO reactor and an artificial wetland are sequentially arranged.
In a second aspect of the disclosure, a comprehensive treatment process for landfill leachate includes:
the pretreated landfill leachate enters an acidification tank, and sulfuric acid is added into the acidification tank to adjust the pH value; adding a Fenton reagent into the fluidized bed Fenton oxidation tower by a Fenton reagent storage tank to carry out a Fenton reaction; the landfill leachate after Fenton reaction enters a sedimentation tank, alkali liquor is added into the sedimentation tank to adjust the pH value, and then flocculating agent is added to remove the iron mud flocculation precipitation; the landfill leachate enters an AO nitrosation reaction tank, ammonia nitrogen is removed, and the landfill leachate with higher nitrite nitrogen content is obtained after precipitation; the landfill gas passes through a deoxidizing device, and the deoxidized landfill gas is conveyed to a DAMO reaction device through a built-in polyvinylidene fluoride hollow fiber membrane; after the AO nitrosation reaction, the landfill leachate enters a DAMO reaction device, namely an anaerobic membrane bioreactor; and finally, desalting and deeply purifying the landfill leachate after the DAMO reaction through an artificial wetland.
In a third aspect of the disclosure, the comprehensive treatment system and/or the comprehensive treatment process for landfill leachate is applied to landfill leachate treatment.
One or more technical schemes in the disclosure have the following beneficial effects:
after large particle suspended solids are removed through pretreatment, landfill leachate is treated by adopting a Fenton advanced oxidation technology to refractory organic matters therein, the carbon-nitrogen ratio and the biodegradability of the landfill leachate are improved, AO nitrosation reaction and anaerobic methane oxidation (DAMO) reaction are combined, the landfill leachate is subjected to biological denitrification treatment, the recycling of landfill gas is realized while pollutants in the landfill leachate are removed, the use of an external carbon source is reduced, the purposes of resource saving and recycling are achieved, the landfill leachate is further desalted and deeply purified by adopting a composite artificial wetland based on Capacitive Deionization (CDI) after the biological denitrification, and the method has good environmental and economic benefits.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
FIG. 1: the landfill leachate treatment system of embodiment 1;
wherein, 1-grid and screen, 2-H2SO4The device comprises a storage tank, a 3-stirrer, a 4-acidification tank, a 5-Fenton reagent storage tank, a 6-fluidized bed Fenton oxidation tower, a 7-NaOH storage tank, an 8-polyacrylamide flocculant (PAM) storage tank, a 9-sedimentation tank, a 10-air pump, an 11-AO nitrosation reaction tank, a 12-gas deoxygenation device, a 13-DAMO reactor, a 14-sludge collection tank and a 15-CDI-based composite artificial wetland.
Detailed Description
The disclosure is further illustrated with reference to specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out according to conventional conditions or according to conditions recommended by the manufacturers.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The reagents or starting materials used in the present invention can be purchased from conventional sources, and unless otherwise specified, the reagents or starting materials used in the present invention can be used in a conventional manner in the art or in accordance with the product specifications. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention. The preferred embodiments and materials described herein are intended to be exemplary only.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.
At present, the biodegradability of landfill leachate treatment is poor, an additional carbon source is usually required by adopting the traditional nitrification and denitrification biological denitrification, the treatment cost is high, and the treatment process is limited by high-concentration ammonia nitrogen, so that the treatment effect is influenced. Therefore, the disclosure provides a comprehensive treatment system and a process for landfill leachate.
In an embodiment of the present disclosure, a landfill leachate comprehensive treatment system includes: along the flowing direction of the landfill leachate, an acidification tank, a fluidized bed Fenton oxidation tower, an AO nitrosation reaction tank, a DAMO reactor and an artificial wetland are sequentially arranged.
Firstly, a Fenton advanced oxidation technology is adopted to remove or convert refractory organic matters such as hydrocarbons, phenolic aldehyde and heterocyclic compounds in the landfill leachate into degradable micromolecular compounds, so that the carbon-nitrogen ratio and biodegradability of the landfill leachate are improved, and the denitrification effect of the subsequent AO nitrosation reaction is improved; by adopting a biological treatment method combining AO nitrosation and DAMO processes, ammonia nitrogen in the landfill leachate is converted into nitrosonitrogen which can be utilized by the DAMO process through AO nitrosation, and then methane in the landfill gas is consumed through the DAMO process and the nitrosonitrogen is converted into nitrogen to be removed, so that the landfill gas is recycled while the denitrification of the landfill leachate is realized, the use of an external carbon source is reduced, and the purposes of saving and recycling resources are achieved; and performing further desalination and deep purification on the landfill leachate through a CDI-based composite artificial wetland.
In one embodiment of the present disclosure, the system further comprises a settling tank disposed between the fluidized bed Fenton oxidation tower and the AO nitrosation reaction tank; the sedimentation tank is provided with an alkali liquor storage tank and a flocculating agent storage tank. The alkali liquor storage tank is used for conveying alkali liquor to the sedimentation tank so as to adjust the pH value, and the flocculating agent storage tank is used for adding a flocculating agent to the sedimentation tank, so that impurities such as iron mud flocculation precipitation and the like can be removed favorably under the action of the alkali liquor and the flocculating agent.
In one embodiment of the present disclosure, the lye in the lye storage tank is selected from the group consisting of potassium hydroxide, sodium hydroxide, milk of lime, sodium carbonate, preferably, sodium hydroxide; or the flocculating agent is selected from polyacrylamide, polyaluminium chloride or polyferric sulfate, and preferably, the flocculating agent is polyacrylamide. The pH value is adjusted by sodium hydroxide, so that the method is more convenient and efficient, and the polyacrylamide flocculant has a better effect of removing iron mud impurities.
In one embodiment of the present disclosure, the DAMO reactor is an anaerobic membrane bioreactor having a polyvinylidene fluoride hollow fiber membrane disposed therein. Through setting up polyvinylidene fluoride hollow fiber membrane, be favorable to realizing the further processing to landfill gas, be favorable to increasing the area of contact of landfill gas and the interior mixed liquid of reactor, the mass transfer effect of methane in the reinforcing landfill gas promotes going on of DAMO process.
In one embodiment of the present disclosure, the system further includes a gas deoxygenation device, one end of the gas deoxygenation device is connected with the landfill gas, and the other end of the gas deoxygenation device is connected with the DAMO reactor, so that the landfill gas is effectively utilized, the carbon source input is reduced, and in addition, under the action of DAMO microorganisms, methane is used as an electron donor to convert nitrite nitrogen into nitrogen, so that nitrogen removal and resource recovery of the landfill gas are realized.
In one embodiment of the present disclosure, the acidification tank is further connected with a sulfuric acid storage tank and a stirrer; a Fenton reagent storage tank is also arranged on a passage between the acidification tank and the fluidized bed Fenton oxidation tower; or an air pump is arranged at the bottom of the AO nitrosation reaction tank.
In one embodiment of the disclosure, the artificial wetland is a composite artificial wetland desalination system based on capacitive deionization; the periphery and the bottom of the artificial wetland are provided with impermeable layers, the device is paved with gravels, biological ceramsite, zeolite and soil from the bottom to the top in layers, and the plants in the wetland are more than one of reed, cattail and bamboo reed. The composite artificial wetland can realize efficient advanced treatment of the landfill leachate, and further improves desalination and advanced purification.
In an embodiment of the present disclosure, a comprehensive treatment process for landfill leachate includes:
the pretreated landfill leachate enters an acidification tank, and sulfuric acid is added into the acidification tank to adjust the pH value; the Fenton reagent storage tank adds the Fenton reagent into the fluidized bed Fenton oxidation tower for Fenton reaction, and the Fenton reagent (Fe) is added into the fluidized bed Fenton oxidation tower2+、H2O2) The degradation-resistant macromolecular organic matters in a part of landfill leachate can be effectively removed; the landfill leachate after Fenton reaction enters a sedimentation tank, alkali liquor is added into the sedimentation tank to adjust the pH value, and then flocculating agent is added to remove the iron mud flocculation precipitation; the landfill leachate enters an AO nitrosation reaction tank, ammonia nitrogen is removed, and the landfill leachate with higher nitrite nitrogen content is obtained after precipitation; the landfill gas passes through a deoxidizing device, and the deoxidized landfill gas is conveyed to a DAMO reaction device through a built-in polyvinylidene fluoride hollow fiber membrane; after the AO nitrosation reaction, the landfill leachate enters a DAMO reaction device, namely an anaerobic membrane bioreactor; and finally, desalting and deeply purifying the landfill leachate after the DAMO reaction through an artificial wetland.
In one embodiment of the present disclosure, the pretreatment process comprises pretreating the landfill leachate through a grid and a screen; or, the pH value in the acidification tank is 2-4; or the pH value in the sedimentation tank is 7-9. Through pretreatment, the method is favorable for removing large-particle suspended matters, well controls the pH value in the reaction process, and has a good effect on improving denitrification and the like.
In one embodiment of the present disclosure, the comprehensive landfill leachate treatment system and/or the comprehensive landfill leachate treatment process are applied to landfill leachate treatment.
In order to make the technical solutions of the present disclosure more clearly understood by those skilled in the art, the technical solutions of the present disclosure will be described in detail below with reference to specific embodiments.
Example 1
A landfill leachate comprehensive treatment system specifically is: along landfill leachate flow direction, set gradually 1 grid and screen cloth, 4 acidizing ponds, 6 fluidized bed Fenton oxidation towers, 9 sedimentation tanks, 11AO nitrosation reaction tank, 13DAMO reactor and 15 constructed wetland, wherein, in order to adjust the pH valve in the acidizing pond, still be provided with 2 sulphuric acid holding tanks and be connected with the acidizing pond, simultaneously, still be provided with 3 agitators in the acidizing pond and be used for realizing even acidizing process. In order to add the Fenton reagent into the fluidized bed Fenton oxidation tower, 5Fenton reagent storage tanks are arranged on pipelines of the acidification tank and the fluidized bed Fenton oxidation tower. In order to adjust the pH value in the sedimentation tank, a 7 sodium hydroxide storage tank and an 8 polyacrylamide flocculant storage tank are also arranged on a pipeline between the fluidized bed Fenton oxidation tower and the sedimentation tank. The bottom of the AO nitrosation reaction tank is provided with a 10 air pump to provide enough reaction gas for the reaction tank. To utilize the landfill gas, a 12-gas deoxygenation device was also connected to the DAMO reactor. The effluent of the settling tank, the AO nitrosation reaction tank and the DAMO reactor is collected by a 14 sludge collection tank.
In order to improve the effect of deeply purifying the landfill leachate, the artificial wetland adopts modular equipment, impermeable layers are arranged on the periphery and the bottom of the artificial wetland, broken stones, biological ceramsite, zeolite and soil are paved on the device in a layered mode from the bottom to the top, and the plants in the wetland are reeds.
Example 2:
based on the comprehensive treatment system of landfill leachate of embodiment 1, the landfill leachate is adopted, the COD concentration is 1100 +/-50 mg/L, the BOD concentration is 300 +/-30 mg/L, and the ammonia nitrogen concentration is 800 +/-50 mg/L.
After Fenton oxidation and AO nitrosation, the ammonia nitrogen concentration in the percolate is reduced to below 10mg/L, the effluent nitrite nitrogen concentration is 500 +/-20 mg/L, and the nitrate nitrogen concentration is 50 +/-5 mg/L, so that nitrosation is successfully realized. Therefore, the landfill leachate after Fenton oxidation has a good biochemical effect, and the ammonia nitrogen removal or conversion rate reaches 98 +/-1%.
Adding the garbage percolate which is subjected to nitrosation reaction and diluted by 5 times into an anaerobic membrane bioreactor, and performing denitrification experiments, wherein the percolate contains 100 +/-20 mg/L of nitrite nitrogen and 10 +/-1 mg/L of nitrate nitrogen, the effluent nitrite nitrogen and the nitrate nitrogen are respectively reduced to 10 +/-5 mg/L and 5 +/-2 mg/L after 5 days of reaction, and the total nitrogen removal rate reaches 86 +/-11%. The denitrification effect analysis shows that the removal rate of the nitrous nitrogen and the nitrate nitrogen in the DAMO process can reach 30 +/-3 mg/L/d at most. The DAMO process can be applied to actual landfill leachate with high salinity and complex components and achieves a certain denitrification effect.
Finally, the landfill leachate is desalted and deeply purified through a composite artificial wetland based on CDI, and the effluent meets the GB16889-2008 requirement and is discharged after reaching the standard.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a landfill leachate integrated processing system which characterized by includes: along the flowing direction of the landfill leachate, an acidification tank, a fluidized bed Fenton oxidation tower, an AO nitrosation reaction tank, a DAMO reactor and an artificial wetland are sequentially arranged.
2. The comprehensive landfill leachate treatment system of claim 1, wherein the system further comprises a settling tank disposed between the fluidized bed Fenton oxidation tower and the AO nitrosation reaction tank; the sedimentation tank is provided with an alkali liquor storage tank and a flocculating agent storage tank.
3. The integrated landfill leachate treatment system of claim 2, wherein the lye in the lye storage tank is selected from the group consisting of potassium hydroxide, sodium hydroxide, lime milk, sodium carbonate, preferably sodium hydroxide; or the flocculating agent is selected from polyacrylamide, polyaluminium chloride or polyferric sulfate, and preferably, the flocculating agent is polyacrylamide.
4. The integrated landfill leachate treatment system of claim 1, wherein the DAMO reactor is an anaerobic membrane bioreactor with a polyvinylidene fluoride hollow fiber membrane disposed therein.
5. The integrated landfill leachate treatment system of claim 1, wherein the system further comprises a gas deoxygenator device, one end of the gas deoxygenator device is connected to the landfill gas, and the other end of the gas deoxygenator device is connected to the DAMO reactor.
6. The comprehensive landfill leachate treatment system of claim 1, wherein the acidification tank is further connected with a sulfuric acid storage tank and a stirrer; a Fenton reagent storage tank is also arranged on a passage between the acidification tank and the fluidized bed Fenton oxidation tower; or an air pump is arranged at the bottom of the AO nitrosation reaction tank.
7. The comprehensive treatment system for landfill leachate according to claim 1, wherein the artificial wetland is a composite artificial wetland desalination system based on capacitive deionization; the periphery and the bottom of the artificial wetland are provided with impermeable layers, the device is paved with gravels, biological ceramsite, zeolite and soil from the bottom to the top in layers, and the plants in the wetland are more than one of reed, cattail and bamboo reed.
8. A comprehensive treatment process for landfill leachate is characterized by comprising the following steps:
the pretreated landfill leachate enters an acidification tank, and sulfuric acid is added into the acidification tank to adjust the pH value; adding a Fenton reagent into the fluidized bed Fenton oxidation tower by a Fenton reagent storage tank to carry out a Fenton reaction; the landfill leachate after Fenton reaction enters a sedimentation tank, alkali liquor is added into the sedimentation tank to adjust the pH value, and then flocculating agent is added to remove the iron mud flocculation precipitation; the landfill leachate enters an AO nitrosation reaction tank, ammonia nitrogen is removed, and the landfill leachate with higher nitrite nitrogen content is obtained after precipitation; the landfill gas passes through a deoxidizing device, and the deoxidized landfill gas is conveyed to a DAMO reaction device through a built-in polyvinylidene fluoride hollow fiber membrane; after the AO nitrosation reaction, the landfill leachate enters a DAMO reaction device, namely an anaerobic membrane bioreactor; and finally, desalting and deeply purifying the landfill leachate after the DAMO reaction through an artificial wetland.
9. The comprehensive treatment process for landfill leachate according to claim 8, wherein the pretreatment process comprises pretreating the landfill leachate through a grid and a screen; or, the pH value in the acidification tank is 2-4; or the pH value in the sedimentation tank is 7-9.
10. Use of the landfill leachate comprehensive treatment system of any one of claims 1 to 7 and/or the landfill leachate comprehensive treatment process of claim 8 or 9 in landfill leachate treatment.
CN202110639338.1A 2021-06-08 2021-06-08 Comprehensive treatment system and process for landfill leachate Pending CN113480086A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114535246A (en) * 2022-02-21 2022-05-27 大连理工大学 Device and process for enhancing two-phase anaerobic digestion by using Fenton iron mud and iron-containing biochar

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