CN108083454A - A kind of device that Industrial Wastewater Treatment denitrogenation production capacity is carried out based on DAMO - Google Patents
A kind of device that Industrial Wastewater Treatment denitrogenation production capacity is carried out based on DAMO Download PDFInfo
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- CN108083454A CN108083454A CN201810027858.5A CN201810027858A CN108083454A CN 108083454 A CN108083454 A CN 108083454A CN 201810027858 A CN201810027858 A CN 201810027858A CN 108083454 A CN108083454 A CN 108083454A
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- 239000010842 industrial wastewater Substances 0.000 title claims abstract description 17
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000002351 wastewater Substances 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 7
- 238000005276 aerator Methods 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 54
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 4
- 239000005431 greenhouse gas Substances 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 239000002028 Biomass Substances 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 241000894006 Bacteria Species 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 208000028659 discharge Diseases 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 241001135750 Geobacter Species 0.000 description 3
- 238000005273 aeration Methods 0.000 description 3
- 150000001335 aliphatic alkanes Chemical class 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 2
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 2
- 239000002154 agricultural waste Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 230000002906 microbiologic effect Effects 0.000 description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 238000009280 upflow anaerobic sludge blanket technology Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 241000193830 Bacillus <bacterium> Species 0.000 description 1
- 241000912832 Candidatus Methylomirabilis oxyfera Species 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- 239000011942 biocatalyst Substances 0.000 description 1
- 230000031018 biological processes and functions Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 241000230247 environmental samples <Bacteria> Species 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 125000001477 organic nitrogen group Chemical group 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000009923 sugaring Methods 0.000 description 1
Classifications
-
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- 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
- C02F3/005—Combined electrochemical biological 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
- C02F3/28—Anaerobic digestion processes
- C02F3/284—Anaerobic digestion processes using anaerobic baffled reactors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/16—Biochemical fuel cells, i.e. cells in which microorganisms function as catalysts
-
- C—CHEMISTRY; METALLURGY
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/009—Apparatus with independent power supply, e.g. solar cells, windpower, fuel cells
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention discloses a kind of devices that Industrial Wastewater Treatment denitrogenation production capacity is carried out based on DAMO, it is characterized in that, including ABR MFC coupled reactors, the ABR MFC coupled reactors are the cell structure for including multiple cell compartments, wherein the first cell compartment is the front end of ABR MFC coupled reactors and is MFC anode chambers equipped with water inlet, last 1 cell compartment, reflowable the 2nd cell compartment to ABR MFC coupled reactors of MFC anode waste water, the outer wall of anode chamber is equipped with air cathode, air cathode is connected with the indoor anode of anode by load, and anode chamber is equipped with water outlet.This apparatus structure is simple, operation is efficient, and this device effectively can be removed and produced electricl energy to the ammonia nitrogen of waste water, and can reduce the discharge of greenhouse gas methane, have good economic implications and Significance for Environment.
Description
Technical field
The present invention relates to technology for treating industrial waste water, and in particular to is that one kind is based on denitrification type anaerobic methane oxidation
(Denitrifying anaerobic methane oxidation, abbreviation DAMO) is produced electricity with methane driving, utilizes ABR
(Anaerobic baffled reactor, anaerobic baffled reactor, abbreviation ABR)- microbiological fuel cell(Microbial
Fuel cells, abbreviation MFC)The device of the nitrogenous industrial wastewater of coupling technique processing, it is especially a kind of that industry is carried out based on DAMO
The device of wastewater treatment denitrogenation production capacity.
Background technology
Anaerobic technology is the important method for handling high concentrated organic wastewater, and with small investment, low energy consumption, recoverable natural pond
The gas energy, load are high, produce many advantages, such as few mud, anti impulsion load and be taken seriously, and become grinding for field of industrial waste water treatment
Study carefully hot spot.With the development of anaerobic biological wastewater treatment, anaerobic biological reactor experienced different developing stage, occur
A variety of anaerobic biological reactors, such as upflow anaerobic sludge blanket process(UASB), anaerobic filter(AF), expanded granular sludge bed reactor
(EGSB), internal-circulation anaerobic reactor (IC), anaerobic baffled reactor(ABR)Deng.Anaerobic reactor is extensive at present
Applied in the industrial wastewaters such as sugaring, pharmacy, beer, printing and dyeing, papermaking.But in actual application process, using anaerobic reaction
When device handles industrial wastewater, although methane caused by organic pollutant degradation this valuable energy can be collected, but still there is portion
Methane is divided to be dissolved in waste water, such as when temperature is 15 DEG C, the about methane of 40-50% is dissolved in waste water.These contain dissolving
Property methane waste water into after subsequent Aerobic biological process unit, increase significantly methane gas be discharged into air can
Energy.20-30 times of the amount of substance carbon dioxide such as methane is a kind of important greenhouse gases, and caused greenhouse effects are, therefore
The control of generated dissolubility methane becomes current water process worker with utilizing when handling industrial wastewater to anaerobic reactor
One of hot issue of interest.
Effective processing of high-concentration ammonia nitrogenous wastewater is the problem frequently encountered in anaerobic bio-treated simultaneously, on the one hand
The ammonia nitrogen of high concentration can make the inhibition of the active receiving of anaerobe to a certain extent, and entire anaerobic reaction is even resulted in when serious
The collapse of device reaction operation;And on the other hand if the C/N of waste water is too low, denitrification advanced nitrogen processing carbon source deficiency often into
To restrict the key factor of denitrogenation of waste water so that the total nitrogen in waste water is difficult to effectively be removed.2006, Holland
Raghoebarsing etc. obtains anaerobic methane oxidation denitrification for the first time(DAMO)Enriched substance, DAMO processes can utilize anaerobism anti-
The methane in device is answered to carry out denitrogenation processing to waste water, can effectively slow down the greenhouse effects of discharge of methane initiation, while the process can
Using methane as carbon source, denitrogenation is carried out to low C/N waste water, further reduces the nitrogen content of water outlet.During current DAMO, required first
Alkane can be collected from anaerobic digester or UASB reactors, and nitrification tank can be subsequently set after DAMO reactors, but so can be more
Wastewater treatment structures are built, increases and takes up an area, increase capital expenditure.Anaerobic methane oxidation denitrification flora enrichment culture is delayed simultaneously
Slowly, it is a bottleneck problem existing for DAMO that enrichment culture object activity is low.MFC is that will have by the use of microorganism as biocatalyst
Organic pollutants are converted into the device of electric energy, and current research shows some microorganisms in MFC, such as ground bacillus(Geobacter), can
Using methane as electron donor, electric energy is converted into from biological energy source using methane;Simultaneous electrochemical can also improve M.oxyfera bacterium
Enrichment, so as to promote the progress of DAMO processes.
The content of the invention
Industrial Wastewater Treatment denitrogenation is carried out based on DAMO in view of the deficiencies of the prior art, it is an object of the present invention to provide one kind
The device of production capacity.This apparatus structure is simple, operation is efficient, and this device can effectively remove the ammonia nitrogen of waste water,
It can produce electricl energy again, and the discharge of greenhouse gas methane can be reduced, there is good economic implications and Significance for Environment.
Realizing the technical solution of the object of the invention is:
A kind of device that Industrial Wastewater Treatment denitrogenation production capacity is carried out based on DAMO, including ABR-MFC coupled reactors, the ABR-
MFC coupled reactors are the cell structure for including multiple cell compartments, wherein the 1st cell compartment is the front end of ABR-MFC coupled reactors
And water inlet, last 1 cell compartment are equipped with as MFC anode chambers, MFC anodes waste water can be back to ABR-MFC couplings by reflux pump
2nd cell compartment of reactor, the outer wall of anode chamber are equipped with air cathode, and air cathode is outer by loading with the indoor anode of anode
Resistance is connected, and anode chamber is equipped with water outlet.
The quantity of the multiple cell compartment is at least five.
The outside of the ABR-MFC coupled reactors is equipped with the gas collector connected with ABR-MFC coupled reactors.
First cell compartment is equipped with aerator.
The anode being made of the biomass carbon prepared by agricultural wastes is set in the anode chamber, biomass carbon cathode can
Better environment, the biomass carbon anode and air cathode of MFC are created for DAMO bacterium, Geobacter bacterium and the growth of electricity production bacterium
Load external resistance is connect altogether.
ABR is combined by this device with MFC technologies, can not only be produced electricl energy, while reduces methane greenhouse gases
Discharge risk, and the denitrification effect to nitrogenous industrial wastewater can be improved.
Microbiological fuel cell(Microbial fuel cell, abbreviation MFC)It is by the use of microorganism as catalyst, oxygen
Change a kind of new device that decomposing biomass exports electric energy simultaneously, because chemical energy in biomass can be converted into electric energy by it,
It is the following effective way for alleviating the energy and environmental problem.Anaerobic baffled reactor(Anaerobic baffled
Reactor, abbreviation ABR)Compared to expanded granular sludge bed reactor(EGSB), internal-circulation anaerobic reactor (IC) etc., its structure
Make a series of advantages such as simpler, expense is relatively low, capacity of resisting impact load is strong, management simplicity.What is more important, ABR
Lattice cell structure, be easy to be transformed ABR and be coupled with other wastewater processing technologies.The advantages of present apparatus is to fill
Divide the cell structure that make use of ABR, ABR is made to be organically combined with MFC, simple in structure, operation efficiently, is realized in waste water
The reasonable utilization of dissolubility methane using methane as carbon source, adds nitrification, denitrifying reacting dose in ABR, promotes ammonia nitrogen and go
Except effect;What is more important is also produced electricl energy using the driving of dissolubility methane, in today of energy growing tension, is had good
Good development prospect.
Description of the drawings
Fig. 1 is the structure diagram of embodiment.
In figure, 2. anode chamber of 1.ABR-MFC coupled reactors, 3. air cathode, 4. external resistance, 5. reflux pump 6. is intake
11. water outlet of case 7. intake pump, 8. air pump, 9. water inlet, 10. aeration head, 12. gas collector.
Specific embodiment
Present invention is further elaborated with reference to the accompanying drawings and examples, but is not limitation of the invention.
Embodiment:
With reference to Fig. 1, a kind of device that Industrial Wastewater Treatment denitrogenation production capacity is carried out based on DAMO, including ABR-MFC coupled reactors
1, the ABR-MFC coupled reactors 1 are the cell structure for including multiple cell compartments, wherein the 1st cell compartment is anti-for ABR-MFC couplings
It answers the front end of device 1 and is equipped with water inlet 9, last 1 cell compartment as MFC anode chambers 2, MFC anodes waste water can be returned by reflux pump 5
The 2nd cell compartment of ABR-MFC coupled reactors 1 is flowed to, the outer wall of anode chamber 2 is equipped with air cathode 3, air cathode 3 and anode
Anode in room 2 is connected by loading external resistance 4, and anode chamber 2 is equipped with water outlet 11.
The quantity of the multiple cell compartment is at least five.
The outside of the ABR-MFC coupled reactors 1 is equipped with the gas collection dress connected with ABR-MFC coupled reactors 1
Put 12.
First cell compartment is equipped with aerator.
The anode being made of the biomass carbon prepared by agricultural wastes, biomass carbon cathode are set in the anode chamber 2
Can be DAMO bacterium, the better environment of growth creation of Geobacter bacterium and electricity production bacterium, the biomass carbon anode and air of MFC is cloudy
Load external resistance 4 is extremely connect altogether.
Specifically, water inlet 9 is connected by intake pump 7 with inlet water tank 6, using ABR-MFC coupling devices 1 to Pig raising wastewater
It is handled, waste water is entered by intake pump 6 in ABR-MFC coupling devices 1, is adopted in the 1st cell compartment using air pump 8 and aeration head 10
Micro- aeration is taken, inhibits the accumulation of volatile acid, and is nitrite nitrogen and nitrate nitrogen by organic nitrogen, ammonium oxidation in waste water;It is useless
Water comes into full contact with during flowing through follow-up cell compartment with anaerobe, so as to fulfill the degradation of useless Organic substance in water, generates first
Alkane;Then waste water enters the anode chamber 2 of MFC, and deliquescent methane is reacted with waste water Nitrite Nitrogen, nitrate nitrogen in waste water
Nitrogen is generated, while donor of the deliquescent methane as electronics, electronics are passed over by conductor wire to air from anode chamber 2
Cathode 3, electron stream movable property life electric current, can also be by returning in order to preferably control the progress of DAMO processes and methane driving process
Waste water containing dissolubility methane is back to the 2nd cell compartment of ABR-MFC coupling devices 1, waste water by stream pump 5 from the anode chamber of MFC 2
It after whole device is handled, is discharged through discharge outlet 11, ABR-MFC coupling devices 1 handle the extra first generated during waste water
Alkane, carbon dioxide etc., through 12 Collection utilization of gas collector.
Claims (4)
1. a kind of device that Industrial Wastewater Treatment denitrogenation production capacity is carried out based on DAMO, it is characterized in that, including ABR-MFC coupled reactions
Device, the ABR-MFC coupled reactors are the cell structure for including multiple cell compartments, wherein the 1st cell compartment is anti-for ABR-MFC couplings
It answers the front end of device and is equipped with water inlet, last 1 cell compartment as MFC anode chambers, MFC anode waste water is reflowable to be coupled to ABR-MFC
2nd cell compartment of reactor, the outer wall of anode chamber are equipped with air cathode, and air cathode is with the indoor anode of anode by loading phase
Even, anode chamber 2 is equipped with water outlet.
2. the device according to claim 1 that Industrial Wastewater Treatment denitrogenation production capacity is carried out based on DAMO, it is characterized in that, it is described
The quantity of multiple cell compartments is at least five.
3. the device according to claim 1 that Industrial Wastewater Treatment denitrogenation production capacity is carried out based on DAMO, it is characterized in that, it is described
The outside of ABR-MFC coupled reactors is equipped with the gas collector connected with ABR-MFC coupled reactors.
4. the device according to claim 1 that Industrial Wastewater Treatment denitrogenation production capacity is carried out based on DAMO, it is characterized in that, it is described
First cell compartment is equipped with aerator.
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CN201810027858.5A CN108083454A (en) | 2018-01-11 | 2018-01-11 | A kind of device that Industrial Wastewater Treatment denitrogenation production capacity is carried out based on DAMO |
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CN201810027858.5A CN108083454A (en) | 2018-01-11 | 2018-01-11 | A kind of device that Industrial Wastewater Treatment denitrogenation production capacity is carried out based on DAMO |
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CN201810027858.5A Pending CN108083454A (en) | 2018-01-11 | 2018-01-11 | A kind of device that Industrial Wastewater Treatment denitrogenation production capacity is carried out based on DAMO |
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Cited By (2)
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CN108461770A (en) * | 2018-06-06 | 2018-08-28 | 广西师范大学 | A kind of multi-stage series connection MFC- aerobe slot coupling devices of processing industrial wastewater containing toxicant |
CN113772806A (en) * | 2021-09-17 | 2021-12-10 | 上海交通大学重庆研究院 | Novel integrated microbial fuel cell for treating leachate |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN108461770A (en) * | 2018-06-06 | 2018-08-28 | 广西师范大学 | A kind of multi-stage series connection MFC- aerobe slot coupling devices of processing industrial wastewater containing toxicant |
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CN113772806B (en) * | 2021-09-17 | 2022-12-23 | 上海交通大学重庆研究院 | Integrated microbial fuel cell for treating leachate |
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