CN107964552A - A kind of anaerobic digestion couples the method for improving methane combined coefficient with MFC - Google Patents
A kind of anaerobic digestion couples the method for improving methane combined coefficient with MFC Download PDFInfo
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 230000029087 digestion Effects 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 60
- 239000002002 slurry Substances 0.000 claims abstract description 38
- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 238000010276 construction Methods 0.000 claims abstract description 3
- 239000003610 charcoal Substances 0.000 claims description 10
- 230000009977 dual effect Effects 0.000 claims description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- -1 potassium ferricyanide Chemical compound 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 239000010936 titanium Substances 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 238000000855 fermentation Methods 0.000 abstract description 13
- 239000000463 material Substances 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 230000004151 fermentation Effects 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 description 16
- 238000010168 coupling process Methods 0.000 description 16
- 238000005859 coupling reaction Methods 0.000 description 16
- 239000007789 gas Substances 0.000 description 14
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 11
- 210000003608 fece Anatomy 0.000 description 10
- 239000010871 livestock manure Substances 0.000 description 10
- 239000000243 solution Substances 0.000 description 5
- 239000010902 straw Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 150000001335 aliphatic alkanes Chemical class 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 210000002249 digestive system Anatomy 0.000 description 2
- 230000005518 electrochemistry Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 230000002906 microbiologic effect Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P5/00—Preparation of hydrocarbons or halogenated hydrocarbons
- C12P5/02—Preparation of hydrocarbons or halogenated hydrocarbons acyclic
- C12P5/023—Methane
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- 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
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- 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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- 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
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Abstract
The method for improving methane combined coefficient is coupled with MFC the invention discloses a kind of anaerobic digestion, the discarded biogas slurry produced in anaerobic digestion process is disposed while anaerobic digestion methane combined coefficient is improved, the method as material construction MFC and is composed in series battery pack using discarded biogas slurry, the discarded biogas slurry produced in its anolyte comprising anaerobic digestion process；Electrode is added in anaerobic digestion reaction vessel, connects MFC battery packs, biogas slurry carries out anaerobic digestion reaction under conditions of applying 0.8V~1.6V voltages at electrode both ends, the anolyte and catholyte in MFC is replaced after separated in time, until anaerobic digestion end cycle.Present invention incorporates the characteristics of anaerobic digestion and bioelectrochemical system, the method can effectively handle the discarded biogas slurry in fermentation process and improve biological methane combined coefficient, cost-effective, environmental protection, have good economy and environmental benefit.
Description
Technical field
The present invention relates to a kind of method of anaerobic digestion methane phase, couple and carry with MFC more particularly to a kind of anaerobic digestion
The method of high biological methane combined coefficient, belongs to field of biological energy source.
Background technology
Global energy is increasingly serious with environmental problem, and exploitation and the research of new cleaning fuel become global heat
Point.Anaerobic fermentation technology can utilize excrement, stalk to produce clean biogas, and by one of its recycling effective way
Footpath.After excrement, stalk etc. are pre-processed, clean energy resource-methane can be produced through microbiological anaerobic fermentation.But in anaerobic digestion process
Existing methane gas production rate is low, methane concentration is low and is the technological difficulties that people are badly in need of solving the problems such as process high energy consumption.Separately
Outside, the biogas slurry waste water containing high concentration COD that can be produced in anaerobic digestion, disposal difficulty is big, of high cost.If place cannot be concentrated
Reason, can cause serious pollution to water body, soil, endanger environment.
Microbiological fuel cell (microbial fuel cell, MFC) is using microbial degradation organic matter and organic
The chemical energy of release is converted into a kind of device of electric energy, with substrate is extensive, reaction condition is gentle, cleaning in thing decomposable process
The advantages that efficient.
In consideration of it, the present invention utilizes the discarded biogas slurry produced in anaerobic digestion process that MFC electricity productions are made for raw material, recycle
Produced electric energy promotes the combined coefficient of anaerobic digester system biological methane.
The content of the invention
The method for improving methane combined coefficient is coupled with MFC it is an object of the invention to provide a kind of anaerobic digestion, mainly
Solve the problems, such as that methane speed is low, of high cost in anaerobic digestion synthesis, the method can utilize discarded biogas slurry that MFC is made simultaneously
Coupled with anaerobic digester system to promote the combined coefficient of anaerobic digestion methane phase, while solve discarded biogas slurry handling problems, section
About resource, environmental protection.
To achieve the above object, the technical solution adopted in the present invention is as follows：
A kind of anaerobic digestion couples the method for improving methane combined coefficient with MFC, it is characterised in that one group of MFC of construction, its
The discarded biogas slurry produced in Anodic liquid comprising anaerobic digestion process, battery pack is composed in series by MFC；In anaerobic digestion reaction vessel
Middle addition electrode, MFC battery packs are connected by conducting wire, and biogas slurry carries out under conditions of applying 0.8V~1.6V voltages at electrode both ends
Anaerobic digestion is reacted, and is collected methane gas, the anolyte and catholyte in MFC is replaced after separated in time, until anaerobic digestion
End cycle.
MFC devices of the present invention are preferably dual chamber MFC, and dual chamber MFC is made of two electrode chambers, and one is anaerobic room
(anode chamber), another is aerobic room's (cathode chamber), is mainly made of anode (material), cathode (material) and separating materials etc..
Its Anodic is both preferably charcoal felt with cathode, and separating materials include proton membrane, salt bridge, bead, glass fibre and carbon paper etc..
MFC anolytes of the present invention use the discarded biogas slurry produced containing anaerobic digestion process and PBS, its ratio excellent
Elect discarded biogas slurry: PBS=1: 2 (volume ratios) as.Catholyte uses potassium ferricyanide solution.
The method of the present invention uses MFC to be coupled with anaerobic digester system to improve anaerobic digestion methane combined coefficient, described
Method in, using anaerobic digestion process produce discarded biogas slurry MFC is made as raw material, the battery pack control formed after MFC is connected
Its voltage range is made to fluctuate in 0.8V~1.6V.Anolyte and catholyte are replaced when voltage caused by MFC is less than 0.8V.
In method of the present invention, the electrode in anaerobic digestion reaction vessel, anode is preferably charcoal felt, and cathode is preferably titanium
Net.
In method of the present invention, anaerobic digestion reaction can carry out under 20~60 DEG C of condition of different temperatures, such as
Usually at 30~38 DEG C, thermophilic digestion usually carries out at 50~55 DEG C for mesophilic digestion.
After method of the present invention couples anaerobic System with MFC, methane phase efficiency greatly increases, total methane production
Amount is respectively increased about 30.0% and more than 20.0% under medium temperature and hot conditions.
Beneficial effect：The anaerobic digestion of the present invention couples the method for improving methane combined coefficient with MFC, disappears improving anaerobism
The discarded biogas slurry produced in anaerobic digestion process is disposed while changing methane combined coefficient.The method combines anaerobic digestion
And the characteristics of bioelectrochemical system, anaerobic System is coupled and mutually promoted with MFC, anaerobic digestion first can be significantly improved
Alkane combined coefficient, total methane production are respectively increased about 30.0% and more than 20.0% under medium temperature and hot conditions；Avoid at the same time
The secondary pollution of biogas slurry is discarded in anaerobic digestion process, is economized on resources.The present invention can effectively handle discarded in fermentation process
Biogas slurry simultaneously promotes biological methane combined coefficient, cost-effective, environmental protection, has good economy and environmental benefit.Specific bag
Include：
1) present invention improves methane combined coefficient at different temperatures suitable for different material anaerobic digester system；
2) MFC is made as raw material using the discarded biogas slurry in anaerobic digestion process, can effectively degraded and using in discarded biogas slurry
Organic pollution, the content of COD and ammonia nitrogen significantly declines in the biogas slurry after processing, realizes recycling for discarded object,
Clean environment firendly；
3) methane combined coefficient, cost-effective, high-efficiency and economic are promoted using MFC.
Brief description of the drawings
Fig. 1 is anaerobic digestion and the MFC coupling device simplified schematic diagram of the present invention；
Fig. 2 is 38 DEG C of pig manure anaerobic digestions and MFC Fourier Series expansion technique methane total yield spirograms；
Fig. 3 is 50 DEG C of pig manure anaerobic digestions and MFC Fourier Series expansion technique methane total yield spirograms；
Fig. 4 is 38 DEG C of straw anaerobic digestion and MFC Fourier Series expansion technique methane total yield spirograms.
Embodiment
The embodiment of the present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.But need to refer to
Go out, the scope of protection of the present invention is not limited by these specific embodiments, but is determined by claims.
The anaerobic digestion of the present invention couples the method for improving methane combined coefficient with MFC, is produced using anaerobic digestion process
Discarded biogas slurry as anolyte construct MFC, coupled, efficiently used in anaerobic digestion process with anaerobic digester system by MFC
The discarded biogas slurry of generation simultaneously promotes biological methane combined coefficient.
The specific embodiment of the method for the present invention, with being carried out on MFC coupling devices, is specifically wrapped in anaerobic digestion as shown in Figure 1
Include following steps：
(1) single MFC cell apparatus is built：" H " type dual chamber MFC is built, is contained in anolyte in anaerobic digestion process
Discarded biogas slurry.
(2) series connection MFC battery structure battery packs：MFC carried out on the basis of step (1) to be composed in series battery pack, profit
Monitor the voltage change of series connection MFC in real time with electrochemical workstation, its voltage range is 0.8V~1.6V.
(3) series connection MFC is coupled with anaerobic digester system：Electrode is added in the biogas slurry of anaerobic digestion reaction vessel, in anaerobism
Outside digestive system, it is connected by conducting wire with the MFC to connect, MFC battery packs are continuously anaerobism and disappear in anaerobic digestion reaction process
Change system is powered.
(4) anaerobic digestion methane phase gas：Biogas slurry carries out anaerobic digestion reaction, profit under conditions of applying voltage at electrode both ends
Collected with draining water gathering of gas law and record biogas output, methane content is measured with gas chromatograph (SP6800A).Monitor biogas daily output
Amount, and calculate odd-numbered day methane production using biogas output and methane content.
(5) it is usually 3-4 days when MFC output voltages are less than 0.8V, replaces MFC anolytes and catholyte, it is lasting to carry out
Anaerobic digestion couples with MFC and produces methane.
Experimental method used in following embodiments is conventional method without specified otherwise, used experiment reagent,
Consumptive material etc. can be bought without specified otherwise from commercial use.
Embodiment 1
The method provided according to the present invention, pig manure anaerobic digestion is coupled with MFC at carrying out 38 DEG C in laboratory synthesizes first
Alkane, specific method are as follows：
L, biogas slurry MFC voltage monitorings：" H " type dual chamber MFC is built, yin, yang electrode, anode are used as using an equal amount of charcoal felt
Liquid is discarded biogas slurry: PBS=1: 2 mixed solution, catholyte are potassium ferricyanide solution.Electrochemistry is connected to after battery is connected
On work station, the voltage change of MFC is monitored in real time.
2nd, under the conditions of 38 DEG C, MFC is coupled with pig manure anaerobic digester system and produces methane.
Design 3 groups of anaerobic digestion reaction systems：Blank group, additional constant voltage group and coupling systems.Coupling systems are i.e. using this
The method of invention, adds yin, yang electrode in anaerobic fermentation bottle, and cathode is titanium net, and anode be charcoal felt, by the MFC after series connection and
Anaerobic System is connected by conducting wire, and external voltage is provided for anaerobic System, the MFC batteries in anaerobic digestion reaction process
Group is continuously anaerobic System power supply.Yin, yang electrode is only added in the anaerobic fermentation bottle of control group；Applied voltage group is being detested
Yin, yang electrode is added in aerobe fermentation bottle, and utilizes the additional constant voltage 0.8V of constant voltage source, is held in anaerobic digestion reaction process
Continue and power for anaerobic System.
3rd, in anaerobic digestion reaction process, the voltage of MFC battery packs is quickly raised to ceiling voltage about 1.6V, then stablizes one
Start slowly to reduce after the section time, about 3-4 days, when voltage is less than 0.8V, replace MFC anolytes and catholyte.Measure is at this time
The removal rate difference average out to 76.52% and 87.17% (such as table 1) of anolyte, COD and ammonia nitrogen.
1 38 DEG C of pig manure anaerobic digestions of table change with MFC Fourier Series expansion technique anolyte COD and ammonia nitrogen concentration
| React number of days/d | COD(mg/L) | COD removal rates (%) | Ammonia nitrogen (mg/L) | Ammonia nitrogen removal frank (%) |
| 7404 | 3708 | |||
| 4 | 2206 | 70.21% | 439 | 88.16% |
| 8 | 1618 | 78.15% | 462 | 87.54% |
| 12 | 2354 | 68.21% | 507 | 86.33% |
| 16 | 1653 | 77.67% | 484 | 86.95% |
| 20 | 1030 | 86.09% | 507 | 86.33% |
| 24 | 1569 | 78.80% | 456 | 87.70% |
| 76.52% | 87.17% |
4th, the calculating of the measure of methane content and total methane production：Gas sample is taken daily, utilizes gas chromatograph for determination methane
Content, is collected using draining water gathering of gas law and records daily biogas output, calculate odd-numbered day methane production, and then draw methane total yield
The change (such as Fig. 2) of amount.
It can be drawn by Fig. 2：Under the conditions of 38 DEG C, the methane total output of additional constant voltage and coupling systems is all higher than blank
Group, and coupling systems methane combined coefficient is best.Under the conditions of 38 DEG C, MFC synthesizes pig manure anaerobic digestion with anaerobic digestion coupling
Methane has facilitation, improves 33.27%.And compared with additional constant voltage, improve that about 12%, MFC utilizes is useless
It is more environmentally-friendly to abandon biogas slurry, and facilitation effect is more preferable, economical and efficient.
Embodiment 2
The method provided according to the present invention, pig manure anaerobic digestion is coupled with MFC at carrying out 50 DEG C in laboratory synthesizes first
Alkane, specific method are as follows：
1. biogas slurry MFC voltage monitorings：" H " type dual chamber MFC is built, yin, yang electrode, anode are used as using an equal amount of charcoal felt
Liquid is discarded biogas slurry: PBS=1: 2 mixed solution, catholyte are potassium ferricyanide solution.Electrochemistry is connected to after battery is connected
On work station, the voltage change of MFC is monitored in real time.
2. under the conditions of 50 DEG C, MFC is coupled with pig manure anaerobic digester system and produces methane.
Design 3 groups of anaerobic digestion reaction systems：Blank group, additional constant voltage group and coupling systems.Coupling systems are i.e. using this
The method of invention, adds yin, yang electrode in anaerobic fermentation bottle, and cathode is titanium net, and anode be charcoal felt, by the MFC after series connection and
Anaerobic System is connected by conducting wire, and external voltage is provided for anaerobic System, the MFC batteries in anaerobic digestion reaction process
Group is continuously anaerobic System power supply.Yin, yang electrode is only added in the anaerobic fermentation bottle of control group；Applied voltage group is being detested
Yin, yang electrode is added in aerobe fermentation bottle, and utilizes the additional constant voltage 1.6V of constant voltage source, is held in anaerobic digestion reaction process
Continue and power for anaerobic System.
3. in anaerobic digestion reaction process, the voltage of MFC battery packs is quickly raised to ceiling voltage about 1.6V, then stablizes one
Start slowly to reduce after the section time, about 3-4 days, when voltage is less than 0.8V, replace MFC anolytes and catholyte.Measure is at this time
The removal rate difference average out to 73.59% and 92.06% (such as table 2) of anolyte, COD and ammonia nitrogen.
2 50 DEG C of pig manure anaerobic digestions of table change with MFC Fourier Series expansion technique anolyte COD and ammonia nitrogen concentration
| React number of days/d | COD(mg/L) | COD removal rates (%) | Ammonia nitrogen (mg/L) | Ammonia nitrogen removal frank (%) |
| 7650 | 4250 | |||
| 4 | 2119 | 72.30% | 285 | 93.29% |
| 8 | 1471 | 80.77% | 137 | 96.78% |
| 12 | 2059 | 73.08% | 382 | 91.01% |
| 16 | 2354 | 69.23% | 405 | 90.47% |
| 20 | 2206 | 71.16% | 467 | 89.01% |
| 24 | 1912 | 75.00% | 348 | 91.81% |
| 73.59% | 92.06% |
4. the calculating of the measure of methane content and total methane production：Gas sample is taken daily, utilizes gas chromatograph for determination methane
Content, is collected using draining water gathering of gas law and records daily biogas output, calculate odd-numbered day methane production, and then draw methane total yield
The change (such as Fig. 3) of amount.
It can be drawn by Fig. 3：Under the conditions of 50 DEG C, the methane total output of additional constant voltage and coupling systems is all higher than blank
Group, and coupling systems methane combined coefficient is best.Under the conditions of 50 DEG C, MFC synthesizes pig manure anaerobic digestion with anaerobic digestion coupling
Methane has facilitation, improves 21.83%.And compared with additional constant voltage, improve that about 12%, MFC utilizes is useless
It is more environmentally-friendly to abandon biogas slurry, and facilitation effect is more preferable, economical and efficient.
Embodiment 3
The method provided according to the present invention, straw anaerobic digestion is coupled with MFC at carrying out 38 DEG C in laboratory synthesizes first
Alkane, specific method are as follows：
1. biogas slurry MFC voltage monitorings：" H " type dual chamber MFC is built, using an equal amount of charcoal felt as yin, yang electrode,
Anolyte is discarded biogas slurry: PBS=1: 2 mixed solution, catholyte are potassium ferricyanide solution.After battery is connected
It is connected on electrochemical workstation, monitors the voltage change of MFC in real time.
2. under the conditions of 38 DEG C, MFC is coupled with straw anaerobic digestive system and produces methane.
Design 3 groups of anaerobic digestion reaction systems：Blank group, additional constant voltage group and coupling systems.Coupling systems are i.e. using this
The method of invention, adds yin, yang electrode in anaerobic fermentation bottle, and cathode is titanium net, and anode be charcoal felt, by the MFC after series connection and
Anaerobic System is connected by conducting wire, and external voltage is provided for anaerobic System, the MFC batteries in anaerobic digestion reaction process
Group is continuously anaerobic System power supply.Yin, yang electrode is only added in the anaerobic fermentation bottle of control group；Applied voltage group is being detested
Yin, yang electrode is added in aerobe fermentation bottle, and utilizes the additional constant voltage 0.8V of constant voltage source, is held in anaerobic digestion reaction process
Continue and power for anaerobic System.
3. in anaerobic digestion reaction process, the voltage of MFC battery packs is quickly raised to ceiling voltage about 1.6V, then stablizes one
Start slowly to reduce after the section time, about 3-4 days, when voltage is less than 0.8V, replace MFC anolytes and catholyte.Measure is at this time
The removal rate of anolyte, COD and ammonia nitrogen is respectively averagely 69.01% and 88.64% (such as table 3).
3 38 DEG C of straw anaerobic digestion of table change with MFC Fourier Series expansion technique anolyte COD and ammonia nitrogen concentration
4. the calculating of the measure of methane content and total methane production：Gas sample is taken daily, utilizes gas chromatograph for determination methane
Content, is collected using draining water gathering of gas law and records daily biogas output, calculate odd-numbered day methane production, and then draw methane total yield
The change (such as Fig. 4) of amount.
It can be drawn by Fig. 4：Under the conditions of 38 DEG C, the methane total output of additional constant voltage and coupling systems is all higher than blank
Group, and coupling systems methane combined coefficient is best.Under the conditions of 38 DEG C, MFC is coupled to digest straw anaerobic with anaerobic digestion and synthesized
Methane has facilitation, improves 20.91%.And compared with additional constant voltage, improve that about 15%, MFC utilizes is useless
It is more environmentally-friendly to abandon biogas slurry, and facilitation effect is more preferable, economical and efficient.
Claims (7)
1. a kind of anaerobic digestion couples the method for improving methane combined coefficient with MFC, it is characterised in that one group of MFC of construction, wherein
The discarded biogas slurry produced in anolyte comprising anaerobic digestion process, battery pack is composed in series by MFC；In anaerobic digestion reaction vessel
Electrode is added, MFC battery packs are connected by conducting wire, biogas slurry is detested under conditions of applying 0.8V~1.6V voltages at electrode both ends
Oxygen digestion reaction, anolyte and catholyte in MFC is replaced after separated in time, until anaerobic digestion end cycle.
2. a kind of anaerobic digestion according to claim 1 couples the method for improving methane combined coefficient with MFC, its feature exists
In the MFC is dual chamber MFC.
3. a kind of anaerobic digestion according to claim 2 couples the method for improving methane combined coefficient with MFC, its feature exists
In the MFC Anodics and cathode are charcoal felt.
4. a kind of anaerobic digestion according to claim 2 couples the method for improving methane combined coefficient with MFC, its feature exists
In, the discarded biogas slurry and PBS that the MFC anolytes produce for anaerobic digestion process, wherein by volume, counting discarded biogas slurry:
PBS=1: 2；Catholyte uses potassium ferricyanide solution.
5. a kind of anaerobic digestion according to claim 2 couples the method for improving methane combined coefficient with MFC, its feature exists
In, in the method, replacement anolyte and catholyte when voltage caused by MFC is less than 0.8V.
6. a kind of anaerobic digestion according to claim 2 couples the method for improving methane combined coefficient with MFC, its feature exists
In in the anaerobic digestion reaction vessel of the method, anode is charcoal felt, and cathode is titanium net.
7. a kind of anaerobic digestion according to claim 2 couples the method for improving methane combined coefficient with MFC, its feature exists
In anaerobic digestion reaction carries out under 20~60 DEG C of temperature conditionss.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN111170599A (en) * | 2020-01-21 | 2020-05-19 | 河海大学 | Sludge MFC-anaerobic digestion coupling system and performance strengthening method thereof |
| CN113564209A (en) * | 2021-06-30 | 2021-10-29 | 南京工业大学 | Method for improving methane yield of mixed bacteria system by coupling electric signal and chemical signal |
| CN113564209B (en) * | 2021-06-30 | 2024-06-14 | 南京工业大学 | Method for improving methane yield of mixed bacteria system by coupling electric signal and chemical signal |
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