CN110845091A - Microbial electrolysis cell-membrane bioreactor combined treatment device for treating landfill leachate and treatment method thereof - Google Patents
Microbial electrolysis cell-membrane bioreactor combined treatment device for treating landfill leachate and treatment method thereof Download PDFInfo
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- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 14
- 239000012528 membrane Substances 0.000 claims abstract description 40
- 238000009280 upflow anaerobic sludge blanket technology Methods 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 18
- 238000001728 nano-filtration Methods 0.000 claims abstract description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 14
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- 229910002651 NO3 Inorganic materials 0.000 claims description 6
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- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 6
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- 239000010802 sludge Substances 0.000 claims description 5
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 4
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/005—Combined electrochemical biological processes
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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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Abstract
The invention discloses a microbial electrolysis cell-membrane bioreactor combined treatment device for treating landfill leachate and a treatment method thereof. The device consists of a pretreatment system, an electrical biochemical system and a membrane advanced treatment system. The pretreatment system consists of a regulation area, the electric biochemical system consists of a UASB area, a denitrification area and a nitrification area, and the membrane advanced treatment system consists of a nanofiltration area and a reverse osmosis area. An anode electrode I and a cathode electrode II are respectively inserted into the UASB area and the denitrification area, the nitrification area is provided with an anode electrode III with a built-in ultrafiltration membrane component, and the cathode and anode electrodes are connected with a stabilized voltage power supply through an external circuit. The inlet water is treated by a pretreatment system, an electric biochemical system and a membrane advanced treatment system in sequence and then discharged. The invention can efficiently recover biogas energy, increase the recovery rate of a membrane advanced treatment system and relieve membrane pollution while improving the removal efficiency of COD and total nitrogen in the system, and provides a new technology for treating the landfill leachate.
Description
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a microbial electrolysis cell-membrane bioreactor combined treatment device for treating landfill leachate and a treatment method thereof.
Background
Municipal solid waste in China has the problems of high water content, relatively low heat value of the waste and the like, so the municipal solid waste needs to be stored in a garbage bin for 5 to 7 days before being incinerated, dehydrated and fermented, and then is incinerated after the heat value is increased. The leachate is high-concentration organic wastewater generated in the process of dehydrating and fermenting the garbage, and has the characteristics of complex pollutant components, high concentrations of organic pollutants and ammonia nitrogen, high salt content and the like, so that the leachate is difficult to treat. At present, the domestic common garbage leachate treatment process is a biochemical-membrane treatment process, and leachate treatment stations generally have the problems of poor biochemical treatment effect, difficulty in reaching the standard of total nitrogen of effluent, high treatment pressure of a membrane treatment system and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a microbial electrolysis cell-membrane bioreactor combined treatment device for treating landfill leachate and a treatment method thereof.
The specific technical scheme of the invention is as follows: a microbial electrolysis cell-membrane bioreactor combined treatment device for treating landfill leachate comprises a pretreatment system 1, an electrical biochemical system 2 and a membrane advanced treatment system 3; the pretreatment system 1 consists of a regulating area 4, the electrobiochemical system 2 consists of a UASB area 5, a denitrification area 6 and a nitrification area 7, and the membrane advanced treatment system 3 consists of a nanofiltration area 8 and a reverse osmosis area 9; an anode electrode I11 and a cathode electrode II 12 are respectively inserted into the UASB region 5 and the denitrification region 6, and an anode electrode III 13 with a built-in ultrafiltration membrane component is arranged in the nitrification region 7; the anode electrode I11 and the anode electrode III 13 are connected with the anode of a stabilized voltage power supply 14 through leads, and the cathode electrode II 12 is connected with the cathode of the stabilized voltage power supply 14 through leads.
Preferably, the volume ratio of the four chambers of the regulating zone 4, the UASB zone 5, the denitrification zone 6 and the nitrification zone 7 is 7:9:3: 8.
Preferably, the wires 10 in the UASB region 5, the denitrification region 6 and the nitrification region 7 are all stainless steel wires.
Preferably, the anode electrode I11 and the cathode electrode II 12 are made of carbon felts, and the anode electrode III 13 is made of a stainless steel net with an internal ultrafiltration membrane component.
Further, the UASB area 5 in the electrical biochemical system 2 is used as an anode for carrying out high-efficiency organic matter oxidation reaction; the denitrification area 6 is used as a cathode to receive electrons conveyed by the UASB area 5 and the nitrification area 7 for high-efficiency denitrification reaction; the nitrification area 7 is used as an anode for high-efficiency nitrification reaction, and the concentration of activated sludge in the reactor is maintained through the filtering effect of an ultrafiltration membrane component arranged in the anode electrode III 13 on the outlet water, so that the quality of the inlet water of the nanofiltration area 8 is ensured.
The invention also provides a treatment method of the microbial electrolytic cell-membrane bioreactor combined treatment device for treating the landfill leachate, the landfill leachate after being homogenized and equalized in the regulating region 4 is subjected to efficient anaerobic fermentation reaction of organic matters in the UASB region 5 under the action of the microbial electrolytic cell, the nitrification region 6 is subjected to efficient nitrification reaction, the denitrification region 7 is subjected to efficient denitrification reaction, and the nanofiltration region 8 and the reverse osmosis region 9 are used for removing salt, alkalinity, hardness and the like in the landfill leachate, so that pollutants in the landfill leachate are removed efficiently and energy is recovered.
Further, the pollutant treatment method based on the device comprises the following specific steps:
1) the landfill leachate is firstly sent into a regulating area 4 for homogenizing and equalizing, so that the impact load of a subsequent treatment system caused by uneven incoming water is relieved;
2) the leachate after homogenizing and equalizing is sent to a UASB area 5 for anaerobic fermentation reaction, so that macromolecular compounds are oxidized into micromolecular compounds, and the COD load of the subsequent process is reduced;
3) an anode electrode I11 is arranged in the UASB region 5, a cathode electrode II 12 is arranged in the denitrification region 6, an anode electrode III 13 is arranged in the nitrification region 7, the three electrodes are connected with a stabilized voltage power supply 14 through leads, and under the action of an external voltage, the material metabolism and the energy metabolism of microorganisms in the UASB region 5 are enhanced, so that the degradation rate of organic matters and the methane yield in the reaction region are improved, and electrons are conveyed to the denitrification region 6;
4) the water produced by the UASB area 5 automatically flows into the denitrification area 6 to carry out high-efficiency denitrification reaction, and the denitrification area 6 is used as a cathode to receive electrons transmitted by the UASB area 5 and the nitrification area 7 to carry out reduction reaction of nitrate and nitrite so as to generate nitrogen;
5) the water produced by the denitrification area 6 automatically flows into the nitrification area 7 to carry out high-efficiency nitrification reaction, the nitrification area 7 is used as an anode to carry out ammonia nitrogen oxidation reaction and organic matter oxidation reaction to generate nitrate, nitrite and stable inorganic matters, and electrons are conveyed to the denitrification area 6;
6) the effluent of the nitrification region 7 is filtered by an ultrafiltration membrane component arranged in the anode electrode III 14 and then discharged, and the ultrafiltration membrane component can maintain the concentration of the activated sludge in the reactor through physical filtration and ensure the requirement of the nanofiltration region 8 on the quality of the inlet water;
7) the produced water after being filtered by the ultrafiltration membrane component in the nitrification region 7 is pumped to the nanofiltration region 8 and the reverse osmosis region 9 to remove the salt, alkalinity, hardness and the like which can not be removed in the electrical biochemical system 2 and then is discharged.
The invention has the beneficial effects that:
(1) under the action of an external electric field of the microbial electrolytic cell, the microbial activity in the electrical biochemical system is obviously enhanced, and the COD removal rate and the denitrification efficiency in the system can be synchronously improved by 10 percent and 15 percent, so the microbial electrolytic cell-membrane bioreactor combined treatment device and the method thereof can synchronously enhance the removal effect of COD and total nitrogen in the percolate.
(2) Through the domestication effect of the microbial electrolytic cell on methanogens in the UASB area, the methane yield of the UASB area can be improved by 18% compared with that of a traditional anaerobic reactor, so that the microbial electrolytic cell-membrane bioreactor combined treatment device and the method thereof can efficiently recover biogas energy.
(3) By optimizing the electric biochemical system, the pollutant removal rate is obviously enhanced, so that the treatment pressure of a subsequent membrane advanced treatment system is relieved, the membrane pollution is effectively relieved while the recovery rate of the membrane system is improved, and the membrane pollution period can be prolonged by 20 percent, so that the microbial electrolytic cell-membrane bioreactor combined treatment device and the method thereof can effectively reduce the operation cost of the system.
Drawings
FIG. 1 is a schematic structural diagram of a combined treatment device of a microbial electrolysis cell and a membrane bioreactor.
FIG. 2 is a flow chart of a combined treatment method of a microbial electrolytic cell and a membrane bioreactor.
In the figure: the device comprises a pretreatment system 1, an electrical biochemical system 2, a membrane advanced treatment system 3, a regulation area 4, a UASB area 5, a denitrification area 6, a nitrification area 7, a nanofiltration area 8, a reverse osmosis area 9, a stainless steel wire 10, an anode electrode I11, a cathode electrode II 12, an anode electrode III 13 and a stabilized voltage power supply 14.
Detailed Description
The invention is further elucidated with reference to the figures and embodiments.
As shown in figure 1, the main body of the microbial electrolytic cell-membrane bioreactor combined treatment device for treating the landfill leachate consists of a pretreatment system 1, an electrical biochemical system 2 and a membrane advanced treatment system 3 (which are divided by a dashed line frame in the figure). The pretreatment system 1 is composed of a regulation area 4, the electric biochemical system 2 is composed of a UASB area 5, a denitrification area 6 and a nitrification area, the membrane depth treatment system 3 is composed of a nanofiltration area 8 and a reverse osmosis area 9, preferably, the four chambers of the regulation area 4, the UASB area 5, the denitrification area 6 and the nitrification area 7 can be designed into a steel structure or a reinforced concrete structure, and the volume ratio of the four chambers is 7:9:3: 8. An anode electrode I11 and a cathode electrode II 12 are respectively inserted into the UASB region 5 and the denitrification region 6, the nitrification region 7 is provided with an anode electrode III 13 with a built-in ultrafiltration membrane component, preferably, the anode electrode I11 and the cathode electrode II 12 are made of carbon felts, and the anode electrode III 13 is made of a stainless steel net with a built-in ultrafiltration membrane component. The anode electrode I11 and the anode electrode III 13 are connected with the anode of a stabilized voltage power supply 14 through leads, the cathode electrode II 12 is connected with the cathode of the stabilized voltage power supply 14 through leads and is powered by a power supply, and preferably, the leads 10 are all made of stainless steel wires.
According to the pollutant treatment method based on the device, the garbage leachate which is homogenized and uniformly measured in the adjusting area 4 is subjected to efficient anaerobic fermentation reaction of organic matters in the UASB area 5, the nitrification area 6 is subjected to efficient nitrification reaction, the denitrification area 7 is subjected to efficient denitrification reaction, and the nanofiltration area 8 and the reverse osmosis area 9 are used for removing salt, alkalinity, hardness and the like in the leachate, so that pollutants in the leachate are efficiently removed and energy is recovered. The method comprises the following specific steps:
1) the landfill leachate is firstly sent into a regulating area 4 for homogenizing and equalizing, so that the impact load of a subsequent treatment system caused by uneven incoming water is relieved;
2) the leachate after homogenizing and equalizing is sent to a UASB area 5 for anaerobic fermentation reaction, so that macromolecular compounds are oxidized into micromolecular compounds, and the COD load of the subsequent process is reduced;
3) an anode electrode I11 is arranged in the UASB region 5, a cathode electrode II 12 is arranged in the denitrification region 6, an anode electrode III 13 is arranged in the nitrification region 7, the three electrodes are connected with a stabilized voltage power supply 14 through leads, and under the action of an external voltage, the material metabolism and the energy metabolism of microorganisms in the UASB region 5 are enhanced, so that the degradation rate of organic matters and the methane yield in the reaction region are improved, and electrons are conveyed to the denitrification region 6;
4) the water produced by the UASB area 5 automatically flows into the denitrification area 6 to carry out high-efficiency denitrification reaction, and the denitrification area 6 is used as a cathode to receive electrons transmitted by the UASB area 5 and the nitrification area 7 to carry out reduction reaction of nitrate and nitrite so as to generate nitrogen;
5) the water produced by the denitrification area 6 automatically flows into the nitrification area 7 to carry out high-efficiency nitrification reaction, the nitrification area 7 is used as an anode to carry out ammonia nitrogen oxidation reaction and organic matter oxidation reaction to generate nitrate, nitrite and stable inorganic matters, and electrons are conveyed to the denitrification area 6;
6) the effluent of the nitrification region 7 is filtered by an ultrafiltration membrane component arranged in the anode electrode III 14 and then discharged, and the ultrafiltration membrane component can maintain the concentration of the activated sludge in the reactor through physical filtration and ensure the requirement of the nanofiltration region 8 on the quality of the inlet water;
7) the produced water after being filtered by the ultrafiltration membrane component in the nitrification region 7 is pumped to the nanofiltration region 8 and the reverse osmosis region 9 to remove the salt, alkalinity, hardness and the like which can not be removed in the electrical biochemical system 2 and then is discharged. In the whole process, the removal efficiency of COD and total nitrogen is improved, simultaneously, the biogas energy is efficiently recovered, the recovery rate of a membrane treatment system is increased, and membrane pollution is relieved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A microbial electrolysis cell-membrane bioreactor combined treatment device for treating landfill leachate is characterized in that: the device consists of a pretreatment system (1), an electrical biochemical system (2) and a membrane advanced treatment system (3); the pretreatment system (1) is composed of a regulation area (4), the electric biochemical system (2) is composed of a UASB area (5), a denitrification area (6) and a nitrification area (7), and the membrane deep treatment system (3) is composed of a nanofiltration area (8) and a reverse osmosis area (9); an anode electrode I (11) and a cathode electrode II (12) are respectively inserted into the UASB region (5) and the denitrification region (6), and an anode electrode III (13) with a built-in ultrafiltration membrane component is arranged in the nitrification region (7); the anode electrode I (11) and the anode electrode III (13) are connected with the anode of the stabilized voltage power supply (14) through leads, and the cathode electrode II (12) is connected with the cathode of the stabilized voltage power supply (14) through leads.
2. The combined microbial electrolysis cell-membrane bioreactor processing device for processing landfill leachate according to claim 1, wherein: the volume ratio of the four chambers of the adjusting zone (4), the UASB zone (5), the denitrification zone (6) and the nitrification zone (7) is 7:9:3: 8.
3. The combined microbial electrolysis cell-membrane bioreactor processing device for processing landfill leachate according to claim 1, wherein: the wires (10) in the UASB region (5), the denitrification region (6) and the nitrification region (7) are all stainless steel wires.
4. The combined microbial electrolysis cell-membrane bioreactor processing device for processing landfill leachate according to claim 1, wherein: the anode electrode I (11) and the cathode electrode II (12) are made of carbon felts, and the anode electrode III (13) is made of a stainless steel net with a built-in ultrafiltration membrane component.
5. The combined microbial electrolysis cell-membrane bioreactor processing device for processing landfill leachate according to claim 1, wherein: the UASB area (5) in the electrical biochemical system (2) is used as an anode to carry out high-efficiency organic matter oxidation reaction; the denitrification area (6) is used as a cathode to receive electrons conveyed by the UASB area (5) and the nitrification area (7) for high-efficiency denitrification reaction; the nitrification area (7) is used as an anode for high-efficiency nitrification reaction, and the concentration of activated sludge in the reactor is maintained through the filtering action of an ultrafiltration membrane component arranged in the anode electrode III (13) on the outlet water, so that the quality of the inlet water of the nanofiltration area (8) is ensured.
6. A treatment method using the combined microbial electrolysis cell-membrane bioreactor treatment device for treating landfill leachate of claim 1, which is characterized in that: the garbage leachate after being homogenized and equalized in the adjusting area (4) is subjected to efficient anaerobic fermentation reaction of organic matters in the UASB area (5) under the action of the microbial electrolytic cell, the nitrification area (6) is subjected to efficient nitrification reaction, the denitrification area (7) is subjected to efficient denitrification reaction, and the nanofiltration area (8) and the reverse osmosis area (9) are used for removing salinity, alkalinity, hardness and the like in the leachate, so that pollutants in the leachate are efficiently removed and energy is recovered.
7. The microbial electrolysis cell-membrane bioreactor combined treatment method for treating landfill leachate according to claim 6, wherein the method comprises the following steps: the method comprises the following specific steps:
1) the landfill leachate is firstly sent into a regulating area (4) for homogenizing and equalizing, so that the impact load of a subsequent treatment system caused by nonuniform incoming water is relieved;
2) the leachate after homogenizing and equalizing is sent to a UASB area (5) for anaerobic fermentation reaction, so that macromolecular compounds are oxidized into micromolecular compounds, and the COD load of the subsequent process is reduced;
3) an anode electrode I (11) is arranged in the UASB region (5), a cathode electrode II (12) is arranged in the denitrification region (6), an anode electrode III (13) is arranged in the nitrification region (7), the three electrodes are connected with a stabilized voltage power supply (14) through leads, and under the action of an external voltage, the substance metabolism and the energy metabolism of microorganisms in the UASB region (5) are enhanced, so that the degradation rate of organic matters and the yield of methane in the reaction region are improved, and electrons are conveyed to the denitrification region (6);
4) the water produced by the UASB region (5) automatically flows into the denitrification region (6) to carry out high-efficiency denitrification reaction, and the denitrification region (6) is used as a cathode to receive electrons conveyed by the UASB region (5) and the nitrification region (7) to carry out reduction reaction of nitrate and nitrite so as to generate nitrogen;
5) the produced water in the denitrification area (6) automatically flows into the nitrification area (7) to carry out high-efficiency nitrification reaction, the nitrification area (7) is used as an anode to carry out oxidation reaction of ammonia nitrogen and organic matter to generate nitrate, nitrite and stable inorganic matter, and electrons are conveyed to the denitrification area (6);
6) the effluent of the nitrification region (7) is filtered by an ultrafiltration membrane component arranged in the anode electrode III (14) and then discharged, and the ultrafiltration membrane component can maintain the concentration of the activated sludge in the reactor through physical filtration and ensure the requirement of the nanofiltration region (8) on the quality of the inlet water;
7) the produced water after being filtered by the ultrafiltration membrane component in the nitrification area (7) is pumped to the nanofiltration area (8) and the reverse osmosis area (9) to remove the salt, alkalinity, hardness and the like which can not be removed in the electrical biochemical system (2), and then is discharged.
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| CN112174434A (en) * | 2020-09-28 | 2021-01-05 | 重庆大学 | Reactor and method for treating landfill leachate by combining electric Fenton with denitrification biofilter |
| CN112573779A (en) * | 2020-12-27 | 2021-03-30 | 上海康恒环境股份有限公司 | Microbial electrolysis cell-anaerobic ammonia oxidation-Fenton combined treatment device and treatment method for treating kitchen wastewater |
| CN114873848A (en) * | 2022-05-06 | 2022-08-09 | 上海康恒环境股份有限公司 | Treatment device and method for leachate of refuse landfill |
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