CN110642480A - Method and system for treating landfill leachate - Google Patents
Method and system for treating landfill leachate Download PDFInfo
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- CN110642480A CN110642480A CN201911059587.2A CN201911059587A CN110642480A CN 110642480 A CN110642480 A CN 110642480A CN 201911059587 A CN201911059587 A CN 201911059587A CN 110642480 A CN110642480 A CN 110642480A
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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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- 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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- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/30—Organic compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- 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
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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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Abstract
The invention discloses a method and a system for treating landfill leachate, wherein the system comprises a leachate concentration device, an advanced oxidation reactor, a primary A/O reaction tank and a secondary A/O reaction tank; the input port of the advanced oxidation reactor is communicated with the concentrated solution output port of the percolate concentration device, the input port of the primary A/O reaction tank is communicated with the output port of the advanced oxidation reactor, and the input port of the secondary A/O reaction tank is communicated with the output port of the primary A/O reaction tank. The leachate concentration device can improve the concentration of chloride ions in leachate, can obviously improve the efficiency of subsequent electrolytic treatment, and the advanced oxidation reactor can treat concentrated sewage and improve the biodegradability of the sewage, so that the sewage treatment effect of the A/O reaction system is effectively improved.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a method and a system for treating landfill leachate.
Background
The landfill leachate is sewage generated by infiltration of water generated by decomposition fermentation and external water into garbage, is black or brown, and has foul smell.
Landfill leachate contains a large amount of organic and inorganic substances, including various refractory organic substances, inorganic salts and metal ions. Because the garbage has complex components, the leachate has high pollutant content and often contains biotoxicity, which brings great difficulty to the treatment.
In addition, the leachate also contains a large amount of macromolecular organic matters such as humus, humic acid and the like. Although the organic matters have no biological toxicity, the organic matters have large molecular weight and good chemical stability, and microorganisms cannot realize effective degradation, so that the COD in the leachate cannot be effectively removed only by adopting biological treatment.
At present, the treatment of the landfill leachate mostly adopts a process flow of materialization (pretreatment), biological treatment and materialization (advanced treatment). The appropriate pretreatment measures can effectively improve the biodegradability of the leachate and improve the operating environment of the subsequent process. The pretreatment of the landfill leachate at the present stage is mainly flocculation precipitation, ozone oxidation, ammonia stripping and the like.
The existing treatment equipment for various landfill leachate has poor treatment capacity and low efficiency, and COD, ammonia nitrogen and the like of the effluent quality can not reach the discharge standard or have secondary pollution. Therefore, the development and exploration of the garbage leachate treatment process and device which are efficient and economical and meet the new discharge standard are problems to be solved urgently in the garbage landfill treatment process.
Disclosure of Invention
In view of the above, the present invention is directed to the deficiencies of the prior art, and the main objective of the present invention is to provide a method and a system for landfill leachate treatment, which can solve the problem of landfill leachate, and make the drainage meet the corresponding discharge standard.
In order to achieve the purpose, the invention adopts the following technical scheme:
a system for landfill leachate treatment comprises a leachate concentration device, an advanced oxidation reactor, a primary A/O reaction tank and a secondary A/O reaction tank; the input port of the advanced oxidation reactor is communicated with the concentrated solution output port of the percolate concentration device, the input port of the primary A/O reaction tank is communicated with the output port of the advanced oxidation reactor, and the input port of the secondary A/O reaction tank is communicated with the output port of the primary A/O reaction tank.
Preferably, the percolate concentration device is composed of a roll type RO membrane and a DTRO membrane module.
Preferably, the advanced oxidation reactor comprises a container body, an air pump and an AC/DC power supply; the container body is internally provided with a gas distribution plate, a plurality of anodes and a plurality of cathodes, the gas distribution plate is suspended in the container body, the plurality of anodes and the plurality of cathodes are arranged in the container body in a staggered manner at intervals, the plurality of anodes and the plurality of cathodes are all positioned above the gas distribution plate, activated carbon fillers are arranged between the adjacent anodes and cathodes, the bottom of the container body is provided with an air inlet, and the air inlet is positioned below the gas distribution plate; the air pump is positioned outside the container body and is connected with an air inlet through an air pipe, a valve is arranged on the air pipe, and the AC/DC power supply is positioned outside the electrolytic bath and is in conduction connection with each anode and each cathode.
Preferably, the anode is a ruthenium iridium titanium-based electrode, and the ratio of the components of the ruthenium iridium titanium-based electrode coating is as follows: the molar ratio of the ruthenium element to the iridium element is 3-7, and the thickness of the Ru-IrO2 coating of the electrode is 5-10 mu m.
Preferably, the cathode is an aerogel graphene electrode.
Preferably, the activated carbon filler is Fe-Fe supported3O4/g-C3N4The active carbon filler comprises the following components in percentage by weight: fe3O4：g-C3N4＝32～38：50～54：9～13。
Preferably, the activated carbon filler is 2-5 mm activated carbon particles, and Fe are loaded on the activated carbon particles3O4Doped g-C3N4As the catalyst, the catalyst is uniformly dispersed on the surface of the activated carbon by irregular particles with the particle size of 50-200 nm.
A method for treating landfill leachate, which adopts the system for treating the landfill leachate, comprises the following steps:
(1) the landfill leachate flows through a leachate concentration device, the concentration of chloride ions in the leachate is improved, and clear water filtered by a membrane is directly discharged;
(2) the concentrated solution intercepted by the percolate concentrating device enters an advanced oxidation reactor for advanced oxidation reaction, and pretreatment is carried out for subsequent biochemical reaction;
(3) the concentrated solution after advanced oxidation treatment flows into a first-stage A/O reaction tank for denitrification/nitration reaction;
(4) and the sewage after the first-stage A/O reaction flows into a second-stage A/O reaction tank, so that ammonia nitrogen and organic matters are further removed, and the effluent can reach the standard and be discharged.
Preferably, the concentration of chloride ions in the concentrated solution generated by the percolate concentration device is more than 3000mg/L, the percolate passes through the percolate concentration device according to the multiple of the concentrated chloride ions required, and the applied pressure range is 4.5-6.5 Mpa when single-stage DTRO is adopted; when the combination of the roll-type RO and the DTRO is adopted, the pressure applied by the roll-type RO ranges from 2.0 MPa to 3.0MPa, and the pressure applied by the DTRO ranges from 4.5MPa to 6.5 MPa.
Preferably, the method adopted by the advanced oxidation is a Fenton-like method, and in order to ensure the generation efficiency of hydroxyl radicals and available chlorine, the electrolysis condition in the Fenton-like method is that the pH range is 3-5; the current density is 50-300A/m2(ii) a The electrolysis time is 30-300 min, the voltage is 20-60V, and the aeration rate is 0.05-0.20 m3/h。
Compared with the prior art, the invention has obvious advantages and beneficial effects, and specifically, the technical scheme includes that:
the leachate concentration device can improve the concentration of chloride ions in leachate, can obviously improve the efficiency of subsequent electrolytic treatment, and the advanced oxidation reactor can treat concentrated sewage and improve the biodegradability of the sewage, so that the sewage treatment effect of an A/O reaction system is effectively improved.
To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments:
drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the advanced oxidation reactor of the present invention.
The attached drawings indicate the following:
10. leachate concentration device 20 and advanced oxidation reactor
21. Electrolytic bath 22, air pump
23. AC/DC power supply 24 and gas distribution plate
25. Anode 26 and cathode
27. Activated carbon filler 28 and air pipe
29. Valve 201, air input port
30. First-stage A/O reaction tank 40 and second-stage A/O reaction tank
Detailed Description
Referring to fig. 1 and 2, a detailed structure of a system for landfill leachate treatment according to the present invention is shown, which includes a leachate concentrating apparatus 10, an advanced oxidation reactor 20, a primary a/O reaction tank 30, and a secondary a/O reaction tank 40.
The percolate concentrating device 10 is composed of a roll type RO membrane and a DTRO membrane component, when the TDS concentration of the stock solution is less than 5000mg/L, the roll type RO membrane is firstly used for concentrating, and the concentrated solution enters the DTRO again for secondary concentration. When the TDS concentration of the stock solution is more than 5000mg/L, DTRO is directly used for concentration.
The input port of the advanced oxidation reactor 20 is communicated with percolateThe concentrated solution outlet of the concentration device 10, specifically, as shown in fig. 2, the advanced oxidation reactor 20 includes an electrolytic bath 21, an air pump 22 and an AC/DC power supply 23; the electrolytic cell 21 is internally provided with a gas distribution plate 24, a plurality of anodes 25 and a plurality of cathodes 26, the gas distribution plate 24 is suspended in the electrolytic cell 21, the plurality of anodes 25 and the plurality of cathodes 26 are arranged in the electrolytic cell 21 in a staggered manner at intervals, the plurality of anodes 25 and the plurality of cathodes 26 are all positioned above the gas distribution plate 24, an activated carbon filler 27 is arranged between the adjacent anodes 25 and cathodes 26, the bottom of the electrolytic cell 21 is provided with an air inlet 201, and the air inlet 201 is positioned below the gas distribution plate 24; the air pump 22 is located outside the electrolytic bath 21, the air pump 22 is connected to the air inlet 201 through the air pipe 28, the air pipe 28 is provided with a valve 29, and the AC/DC power supply 23 is located outside the electrolytic bath 21 and is conductively connected with each anode 25 and each cathode 26. The anode 25 is a ruthenium-iridium-titanium-based electrode, and for leachate containing a large amount of chloride ions, the ruthenium-iridium-titanium-based electrode has high tank voltage in the electrolytic process, so that the oxidation of the chloride ions in the leachate is facilitated to generate indirect oxidation, and the ruthenium-iridium-titanium-based electrode coating comprises the following components in percentage by weight: the molar ratio of the ruthenium element to the iridium element is 3-7, and the thickness of the Ru-IrO2 coating of the electrode is 5-10 mu m. The cathode 26 is an aerogel graphene electrode, is applied to an electro-Fenton system, and can overcome H2O2Low yield, low current efficiency and the like. The active carbon filler 27 is loaded with Fe-Fe3O4/g-C3N4The active carbon filler comprises the following components in percentage by weight: fe3O4：g-C3N432-38: 50-54: 9-13, and improving the oxidation efficiency of the reaction system. The active carbon filler 27 is 2-5 mm active carbon particles, and Fe are loaded on the active carbon particles3O4Doped g-C3N4As the catalyst, the catalyst is uniformly dispersed on the surface of the activated carbon by irregular particles with the particle size of 50-200 nm.
The input port of the primary A/O reaction tank 30 is communicated with the output port of the advanced oxidation reactor 20, and the input port of the secondary A/O reaction tank 40 is communicated with the output port of the primary A/O reaction tank 30.
The invention also discloses a method for treating the landfill leachate, and the system for treating the landfill leachate comprises the following steps:
(1) the landfill leachate flows through the leachate concentration device 10, the concentration of chloride ions in the leachate is improved, and clear water filtered by a membrane is directly discharged. The concentration of chloride ions in the concentrated solution generated by the percolate concentrating device 10 is more than 3000mg/L, the percolate passes through the percolate concentrating device 10 according to the multiple of the required concentrated chloride ions, and the applied pressure range is 4.5-6.5 Mpa when single-stage DTRO is adopted; when the combination of the roll-type RO and the DTRO is adopted, the pressure applied by the roll-type RO ranges from 2.0 MPa to 3.0MPa, and the pressure applied by the DTRO ranges from 4.5MPa to 6.5 MPa.
(2) The concentrated solution retained by the percolate concentrating device 10 enters an advanced oxidation reactor 20 for advanced oxidation reaction, and pretreatment is carried out for subsequent biochemical reaction.
(3) The concentrate after the advanced oxidation treatment flows into the first-stage A/O reaction tank 30 to perform denitrification/nitrification reaction. The method adopted by the advanced oxidation is a Fenton-like method, and in order to ensure the generation efficiency of hydroxyl radicals and available chlorine, the electrolysis condition in the Fenton-like method is that the pH range is 3-5; the current density is 50-300A/m2(ii) a The electrolysis time is 30-300 min, the voltage is 20-60V, and the aeration rate is 0.05-0.20 m3/h。
(4) The sewage after the first-stage A/O reaction flows into the second-stage A/O reaction tank 40, so that ammonia nitrogen and organic matters are further removed, and the effluent can reach the standard and be discharged. The biochemical degradation treatment time is that the COD content in the landfill leachate is reduced to be less than 100mg/L, and the ammonia nitrogen is reduced to be 25 mg/L.
The invention will be further illustrated in the following two specific examples:
the first embodiment is as follows:
the invention is adopted to treat the landfill leachate of a certain landfill site:
300m of landfill leachate from Guangzhou certain factory3D, COD 2750mg/L, ammonia nitrogen 185mg/L, pH 8.75, total nitrogen 283mg/L, and chloride ion 3290 mg/L; guiding the collected landfill leachate into a leachate concentration device 10, and controlling the leachate through a primary DTRO systemThe applied pressure is 5.0MPa, so that the concentration of chloride ions in the landfill leachate is increased to 6360 mg/L.
Introducing the landfill leachate into an advanced oxidation reactor 20 for electro-Fenton oxidation treatment, continuously blowing air by using an air pump 22, and controlling the air flow to be 0.08m3H is used as the reference value. Adjusting pH to 4, and controlling current density to 80A/m2Electrolyzing for 60min at the voltage of 40V until COD in the percolate is reduced to 367mg/L and ammonia nitrogen is reduced to 48.5 mg/L; and the generated chlorine gas (the part not participating in oxidation) is introduced into the drainage water through a gas pipeline for disinfection treatment.
And (2) introducing the landfill leachate into a two-stage A/O reaction tank for biochemical degradation treatment until COD in the leachate is reduced to 80mg/L, ammonia nitrogen is reduced to 12mg/L, total nitrogen is reduced to 30mg/L, effluent is discharged, and the water quality reaches the second standard in the table of pollution control Standard (GB16889-2008) in the domestic refuse landfill. The water quality conditions of the inlet water and the outlet water of each process are shown in the following table:
example two:
the invention is adopted to treat the landfill leachate of a certain landfill site:
shenzhen certain factory landfill leachate 200m3D, COD 1300mg/L, ammonia nitrogen 170mg/L, pH 7.85, total nitrogen 340mg/L and chloride ion 2890 mg/L; the collected landfill leachate is led into a leachate concentration device 10, and the concentration of chloride ions in the landfill leachate is increased to 5030mg/L by controlling the applied pressure to be 4.5MPa through a primary DTRO system.
Introducing the landfill leachate into an advanced oxidation reactor 20 for electro-Fenton oxidation treatment, continuously blowing air by using an air pump 22, and controlling the air flow to be 0.10m3H is used as the reference value. Adjusting pH to 4, and controlling current density to 120A/m2Electrolyzing for 60min at the voltage of 50V until COD in the percolate is reduced to 438mg/L and ammonia nitrogen is reduced to 65 mg/L; and introducing the generated chlorine gas into the discharged water through a gas pipeline for disinfection treatment.
And (3) introducing the landfill leachate into a two-stage A/O reaction tank for biochemical degradation treatment until COD in the leachate is reduced to 60.5mg/L, ammonia nitrogen is reduced to 13mg/L, total nitrogen is reduced to 25mg/L, effluent is discharged, and the water quality reaches the second standard of the pollution control standard of the domestic refuse landfill (GB 16889-2008). The water quality conditions of the inlet water and the outlet water of each process are shown in the following table:
the design key points of the invention are as follows: the leachate concentration device can improve the concentration of chloride ions in leachate, can obviously improve the efficiency of subsequent electrolytic treatment, and the advanced oxidation reactor can treat concentrated sewage and improve the biodegradability of the sewage, so that the sewage treatment effect of an A/O reaction system is effectively improved.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. A system for landfill leachate treatment, its characterized in that: comprises a percolate concentration device, an advanced oxidation reactor, a primary A/O reaction tank and a secondary A/O reaction tank; the input port of the advanced oxidation reactor is communicated with the concentrated solution output port of the percolate concentration device, the input port of the primary A/O reaction tank is communicated with the output port of the advanced oxidation reactor, and the input port of the secondary A/O reaction tank is communicated with the output port of the primary A/O reaction tank.
2. The system for landfill leachate treatment of claim 1, wherein: the percolate concentrating device is composed of a roll type RO membrane and a DTRO membrane module.
3. The system for landfill leachate treatment of claim 1, wherein: the advanced oxidation reactor comprises a container body, an air pump and an AC/DC power supply; the container body is internally provided with a gas distribution plate, a plurality of anodes and a plurality of cathodes, the gas distribution plate is suspended in the container body, the plurality of anodes and the plurality of cathodes are arranged in the container body in a staggered manner at intervals, the plurality of anodes and the plurality of cathodes are all positioned above the gas distribution plate, activated carbon fillers are arranged between the adjacent anodes and cathodes, the bottom of the container body is provided with an air inlet, and the air inlet is positioned below the gas distribution plate; the air pump is positioned outside the container body and is connected with an air inlet through an air pipe, a valve is arranged on the air pipe, and the AC/DC power supply is positioned outside the electrolytic bath and is in conduction connection with each anode and each cathode.
4. The system for landfill leachate treatment of claim 3, wherein: the anode is a ruthenium-iridium-titanium-based electrode, and the ruthenium-iridium-titanium-based electrode coating comprises the following components in percentage by weight: the molar ratio of the ruthenium element to the iridium element is 3-7, and the thickness of the Ru-IrO2 coating of the electrode is 5-10 mu m.
5. The system for landfill leachate treatment of claim 3, wherein: the cathode is an aerogel graphene electrode.
6. The system for landfill leachate treatment of claim 3, wherein: the active carbon filler is loaded Fe-Fe3O4/g-C3N4The active carbon filler comprises the following components in percentage by weight: fe3O4：g-C3N4＝32～38：50～54：9～13。
7. As in claimA system for landfill leachate treatment as recited in claim 3, wherein: the active carbon filler is 2-5 mm active carbon particles, and Fe are loaded on the active carbon particles3O4Doped g-C3N4As the catalyst, the catalyst is uniformly dispersed on the surface of the activated carbon by irregular particles with the particle size of 50-200 nm.
8. A method for landfill leachate treatment is characterized by comprising the following steps: a system for landfill leachate treatment using any of claims 1-6, comprising the steps of:
(1) the landfill leachate flows through a leachate concentration device, the concentration of chloride ions in the leachate is improved, and clear water filtered by a membrane is directly discharged;
(2) the concentrated solution intercepted by the percolate concentrating device enters an advanced oxidation reactor for advanced oxidation reaction, and pretreatment is carried out for subsequent biochemical reaction;
(3) the concentrated solution after advanced oxidation treatment flows into a first-stage A/O reaction tank for denitrification/nitration reaction;
(4) and the sewage after the first-stage A/O reaction flows into a second-stage A/O reaction tank, so that ammonia nitrogen and organic matters are further removed, and the effluent can reach the standard and be discharged.
9. The method for landfill leachate treatment of claim 8, wherein: the concentration of chloride ions in the concentrated solution generated by the percolate concentration device is more than 3000mg/L, the percolate passes through the percolate concentration device according to the multiple of the required concentrated chloride ions, and the applied pressure range is 4.5-6.5 Mpa when single-stage DTRO is adopted; when the combination of the roll-type RO and the DTRO is adopted, the pressure applied by the roll-type RO ranges from 2.0 MPa to 3.0MPa, and the pressure applied by the DTRO ranges from 4.5MPa to 6.5 MPa.
10. The method for landfill leachate treatment of claim 8, wherein: the method adopted by the advanced oxidation is a Fenton-like method for ensuring the generation efficiency of hydroxyl free radicals and available chlorineThe electrolysis condition in the Fenton-like is that the pH range is 3-5; the current density is 50-300A/m2(ii) a The electrolysis time is 30-300 min, the voltage is 20-60V, and the aeration rate is 0.05-0.20 m3/h。
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| CN112573724A (en) * | 2021-01-13 | 2021-03-30 | 广东威特雅环境科技有限公司 | Equipment for removing sulfide in landfill leachate |
| CN113024001A (en) * | 2021-03-11 | 2021-06-25 | 浙江大学 | Electrochemical-based sequencing batch leachate integrated decarbonization and denitrification device and method thereof |
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