CN103811791B - A kind of Bioelectrochemical device and method extracting also proper energy from discarded object and waste water - Google Patents

A kind of Bioelectrochemical device and method extracting also proper energy from discarded object and waste water Download PDF

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CN103811791B
CN103811791B CN201410042586.8A CN201410042586A CN103811791B CN 103811791 B CN103811791 B CN 103811791B CN 201410042586 A CN201410042586 A CN 201410042586A CN 103811791 B CN103811791 B CN 103811791B
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waste water
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李大平
何晓红
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Chengdu Institute of Biology of CAS
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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
    • 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
    • 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
    • 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 present invention relates to a kind of from discarded object and waste water, extract also proper energy Bioelectrochemical device and method.This device comprises the anode chamber as reactor, conduction wall, barrier film, anode, external circuit, and load or additional power source, and conduction wall is the negative electrode of reactor, and negative electrode is embedded in anode chamber as reactor body structure or as independent negative electrode.This device multiple in parallel or series connection can make integrating device, increases disposal ability.Under this device can be operated in biological fuel cell or biological electrolysis pool mode, or two kinds of mode alternate runs, the course of work controls the pH value of waste water between 4 to 9.<!-- 2 -->

Description

A kind of Bioelectrochemical device and method extracting also proper energy from discarded object and waste water
Technical field
The invention belongs to waste water reclaiming and recovery energy technical field, be specifically related to a kind of by by discarded object and wastewater anaerobic oxidation, and by also proper energy for generation of the Bioelectrochemical device of negative oxygen ion, hydrogen and methane and method.
Technical background
In industrial and agricultural production and people's lives process, all can discharge a large amount of discarded objects containing various organic and inorganic reductive pollutants and waste water.All contain a large amount of with the also proper energy of reduction-state material form in these discarded objects and waste water, as discharge from the oil, pharmacy, chemical industry, food processing etc. of natural cellulose, carbohydrate, lipid, protein and industry processes all kinds of organic pollutions, also comprise the inorganic pollution such as ammonia nitrogen, sulfide.Also proper energy in these discarded objects, waste water, only has part biological matter discarded object and high concentrated organic wastewater to be reclaimed by the form of the biomass energies such as fermentation methane phase.Most discarded object, waste water, mainly through terminal processes means, are namely carbon dioxide, water or nontoxic oxidation state species by aerobic oxidation.These processing methods need blast aeration, biological rotating disk etc. to provide a large amount of oxygen as electron acceptor, and the reducing substances in oxidized waste water, oxygen supply expense accounts for a greater part of of biological wastewater treatment cost.
Along with the shortage of the energy, the bioelectrochemical system being representative with microbiological fuel cell, biological electrolytic cell becomes the focus of international bio energy field research.It can pass through microorganism catalysis, decomposes discarded object, waste water by electron transmission to electrode, reclaims also proper energy wherein with electrogenesis, the mode such as hydrogen, organic synthesis of producing.At present, obtained major progress in research fields such as electrogenesis microbe, the transmission of born of the same parents' exoelectron, battery structure, electrode materials, the electron recovery efficiency of organic carbon up to 96.8%(AEM, 2003,69,1548 – 1555).In order to reduce energy consumption further, optimize structure of reactor, single chamber biological fuel cell based on air cathode obtains the attention of scholars, China's publication (200910153236.8) describes the manufacture method of the air cathode of non-metal catalyst, can reduce battery cost.China's publication (200510079759.4) and (200810063876.5) respectively describe air cathode fuel cell structure and are processing the application in waste water and electrogenesis etc.But air cathode mostly makes complexity, needs to carry the materials such as noble metal catalyst and proton exchange membrane such as platinum, is difficult to make large-sized battery structure.
Biological electrolytic cell a large amount of studied person is used for carrying out the auxiliary bio-hydrogen research of electricity, and in cathode material research, under applying electrical potential 0.6V condition, stainless steel cathode produces hydrogen can reach 1.7m 3/ m 3.d(current density 188A/m 3) (Environ.Sci.Technol.2009,43,2179 – 2183).On MEC basis, traditional double room, single chamber produces hydrogen research without film MEC and also obtains large progress, and under applying electrical potential 0.8V condition, single chamber reaches 3.12m without film MEC hydrogen-producing speed 3/ m 3.d(current density reaches 292A/m 3), electron recovery efficiency reaches 98%(Environ.Sci.Technol.2008,42,3401 – 3406).Utilize the screen electrode of titanium/ruthenium alloy for the biological electrolysis of residual active sludge, 1.4 and 1.8V applying electrical potential under, the anaerobic fermentation that the productivity ratio of hydrogen and methane does not add electromotive force exceed respectively 1.7-5.2 doubly, 11.4-13.6 doubly (InternationalJournalofHydrogenEnergy, 2013,38,1342-1347).The bioelectrochemical system reducing carbon dioxide methanogenic research in next life of biological-cathode is utilized to have been reported (WO2009/155587A2).The method uses biological-cathode as catalyst, just can synthesizing methane without the need to hydrogen and organic interpolation.By biological anode and biological-cathode coupling, the also proper energy of sulfides from wastewater has successfully been utilized to carry out synthesis of acetic acid (EST, 2013,47,568-573).
At present, the research that concerns about bio electrolysis and bioelectricity synthesize rests on the laboratory scale of several milliliters-hundreds of milliliters mostly.Main cause is the basic structure of bioelectrochemical system based on the biological electrolytic cell in traditional two rooms, although obtain large progress in fields such as battery structure optimization, amberplex, year platinum electrode catalysis in recent years, but due to the defect such as gas, iontophoretic injection of film, cause the course of reaction between bioelectrochemical system the anode chamber and the cathode chamber to be subject to mutual interference.In addition, being limited by the restriction of amberplex, electrode material cost, structure of reactor intensity and energy conversion efficiency, is that MFC or the bioelectrochemical system based on MEC are all difficult to amplify and scale application.
Summary of the invention
In order to utilize the also proper energy in discarded object and waste water, solve existing Bioelectrochemical device due to structure, material restriction be difficult to the problems such as amplification, the technical problem to be solved in the present invention is to provide a kind of Bioelectrochemical device extracting discarded object, wastewater reduction energy, the also proper energy that the anaerobic oxidation of discarded object, waste water produces can be used for the synthesis of negative oxygen ion, hydrogen, methane by this device, realize discarded object, the resource of waste water and recovery energy.The present invention can be widely used in all types of industries waste water, sanitary wastewater, heavy metal wastewater thereby and excess sludge and other agricultural, trade waste process field.
For solving the problems of the technologies described above, this invention takes following technical scheme:
The invention provides a kind of Bioelectrochemical device extracting also proper energy from discarded object and waste water, it is characterized in that, described device comprises the anode chamber (1) as reactor, conduction wall (2), barrier film (3), anode (5), external circuit, and load (6) or additional power source (7); Conduction wall (2) is the negative electrode of reactor, and negative electrode is embedded in anode chamber as reactor body structure or as independent negative electrode.
Further, as conduction wall negative electrode as reactor body structure time, formed sealing anode chamber, cathode outer side contacts with outside ambient air, is close to inside negative electrode with barrier film and anode; When negative electrode is embedded in anode chamber (1) as absolute construction, communicate with the surrounding air of circulation inside negative electrode, cathode outer side is close to barrier film and anode, and whole anode chamber is in sealing state.Anode chamber (1) both cylindrical structural may also be rectangular configuration or arbitrary configuration, the negative electrode of absolute construction can be pipeline or rectangular configuration or arbitrary configuration.
Further, water inlet (9), delivery port (10) and gas outlet can be established in anode chamber (1), and the gas reservoir (8) be connected with gas outlet.
Further, anode current collector net (4) can be provided with between barrier film (3) and anode (5), adopt but be not limited to the metallic conduction web material such as stainless steel, titanium, alloy.
Further, the negative electrode of reactor, adopts but the electric conducting material such as conductive metal material, conductivity ceramics such as stainless steel, iron, aluminium, copper, lead being not limited to conduct electricity makes; Its anode (5) adopts but is not limited to the carbon materialses such as carbon felt, carbon paper, carbon cloth, agraphitic carbon fiber, active carbon and makes.
Further, can fill in its anode chamber (1) but be not limited to the filler such as wire, the net structure three dimensional anodes such as activated carbon granule, agraphitic carbon fiber, stainless steel, titanium.
Further, barrier film (3) adopts but is not limited to the materials such as nonwoven fabrics, asbestos fibre, amberplex, synthetic fibers and makes.
Further, additional power source (7) adopts stabilized voltage power supply or potentiostat.
Further, additional power source (7) form run under biological electrolysis pool mode time, cathode outer side insulating material and air exclusion.
Further, according to the effective volume of Bioelectrochemical device and the processing load of discarded object and waste water, 1 process engineering can be combined by two to hundreds of bio-electrochemical reactor serial or parallel connections.
Further, during two to hundreds of bio-electrochemical reactor serial or parallel connection combinations, the reactor that conduction wall builds both can do assistant anode room, shared a cathode chamber contacted with surrounding air (see accompanying drawing 3).
Further, the reactor that conduction wall builds also can be used as independent cathode chamber, and the integral reactor that other materials builds is as a shared anode chamber (see accompanying drawing 4).
Bioelectrochemical device of the present invention, a stabilized voltage power supply or potentiostat can be a bio-electrochemical reactor applying electrical potential, are also two to hundreds of bio-electrochemical reactor applying electrical potentials by parallel.
Bioelectrochemical device of the present invention, by the facility such as blender, circulating pump to circulating in device and stirring.
The operation principle of Bioelectrochemical device of the present invention is as follows:
Device is when external circuit connects load (6), under operating in biofuel cell mode, waste water enters anaerobic oxidation reactor (anode chamber), anode biomembrane decomposes the electron transmission that produces to anode discarded object and wastewater reduction contact scar thing anaerobic oxidation, and by external circuit, electron transmission is synthesized negative oxygen ion to conducting electricity in wall (negative electrode) surrounding air outward.Reductive pollutants in discarded object, waste water is discharged after oxidation.
Device is when external circuit connects additional power source (7), under operating in biological electrolysis pool mode, waste water enters anaerobic oxidation reactor (anode chamber) by water inlet, anode Bacterium of biofilm in discarded object and waste water reductive pollutants anaerobic oxidation produce electron transmission to anode, part electronics synthesizes negative oxygen ion electron transmission by external circuit in the surrounding air in conduction wall (negative electrode) outside, another part electronics is delivered in solution by external circuit and conduction wall (negative electrode), proton reduction anode migration come is hydrogen, or pass through methanogen floras, by electronics/proton, hydrogen, CO 2synthesize methane further, gas reservoir (8) can be used for store produce hydrogen or methane.Reductive pollutants in discarded object, waste water is discharged after oxidation.
The invention still further relates to a kind of bio-electrochemical process extracting also proper energy from discarded object and waste water, it is characterized in that, utilize the device of the invention described above by discarded object and wastewater anaerobic oxidation, and will the method for proper energy for generation of negative oxygen ion, hydrogen and methane be gone back.Reducing substances according to discarded object and waste water forms, and the microorganism species of the anaerobic oxidation of anode chamber's Anodic attachment is also different, and microorganism species includes but not limited to heterotrophic microorganism flora, autotrophic microbe flora etc.Can under biological fuel cell or biological electrolysis pool mode independent operating, or two kinds of mode alternate runs, its also proper energy derive from microbe and participate in discarded object and anaerobic waste water respiratory metabolism.
Heterotrophic microorganism flora of the present invention includes but not limited to Pseudomonas, klebsiella, Alcaligenes, Bacillus, Bacillusbrevis, Aeromonas, the combination in any of one or more kinds of Comamonas, Geobacter, Shewanella etc.
Autotrophic microbe flora of the present invention includes but not limited to ammoxidation flora Nitrosomonas, the bacterium etc. in Nitrosococcus, Nitrosospira, Nitrosolobus, Nitrobacter, Nitrospira; Autotrophy Thiobacillus group as the Thiobacillusferrooxidans of Thiobacillus, Thiobacillusthiooxidans, Thiobacillusdenitrificans etc.; And some facultative autotrophic microorganism species are as the combination in any of one or more kinds in Pseudomonas, Sulfolobus etc.
The microorganism species of synthesizing methane of the present invention includes but not limited to Methanobacterium, Methanocorpusculum, Methanococcus, Geobacter, Methanobrevibacter, Methanosphaera, Methanomicrobium, the combination in any of one or more kinds in Methanoculleus, Methanosarcina and Methanococcoides etc.
Further, in anode chamber's discarded object and wastewater anaerobic oxidation process, control ph is between 4 to 9.
Further, during with stabilized voltage power supply applying electrical potential, the electromotive force between anode and negative electrode is between 100mv-2000mv; When adopting potentiostat applying electrical potential, control anode potential at-400mv-+1200mv(VS.Ag/AgCl) between.A stabilized voltage power supply or potentiostat can be a bioelectricity synthesis reactor applying electrical potential, are also two to hundreds of bioelectricity synthesis reactor applying electrical potentials by parallel.
Compared with conventional waste water process and biological fuel cell, biological electrolytic cell, tool of the present invention has the following advantages:
(1) reduction in discarded object and waste water can be avoided also proper energy by the synthesis that the mode such as anaerobic oxidation and electron transmission is used for negative oxygen ion, hydrogen and methane and consumed by oxygen by bio-electrochemical reactor provided by the invention, achieve discarded object, wastewater reduction can resource and energy.
(2) Bioelectrochemical device provided by the invention, in can effectively solving, the also proper energy of low concentration pollution waste water extracts a difficult problem, while synthesis of chemicals, achieves the terminal processes of waste water.
(3) the present invention forms a bio-electrochemical reactor by conduction wall (negative electrode), barrier film and anode (or anode current collector net), can ensure that the negative oxygen ion synthesis of cathode chamber does not affect anode chamber's anaerobic oxidation process.
(4) when the present invention runs under biological electrolysis pool mode, the proton of discarded object in anode chamber and wastewater anaerobic oxidation accumulation can be synthesized hydrogen and methane under negative electrode is lower than product hydrogen electromotive force, effectively can improve the suppression that proton accumulates and low pH brings microbial activity of traditional biological electrochemical reactor anode chamber.
(5) bio-electrochemical reactor negative electrode of the present invention is tightly fit together by barrier film and anode, more existing biological electrolytic cell has less pole span, barrier film can adopt inexpensive nonwoven fabrics, asbestos fibre etc., significantly can reduce the Master Cost because using amberplex to bring.Reactor body structure is made by electric conducting materials such as stainless steels, and its structural strength can ensure effective amplification.
Accompanying drawing illustrates:
Accompanying drawing 1: negative electrode is as structure drawing of device during reactor body structure
Accompanying drawing 2: negative electrode embeds the structure drawing of device in anode chamber as independent negative electrode
Accompanying drawing 3: the multiple devices sharing cathode chamber are in series or in parallel to form the structure chart of integrating device
Accompanying drawing 4: the multiple devices sharing cathode chamber are in series or in parallel to form the structure chart of integrating device
Wherein: (1) anode chamber; (2) conduction wall; (3) barrier film; (4) anode current collector net; (5) anode; (6) load; (7) additional power source, (8) gas reservoir, (9) water inlet, (10) delivery port.
Embodiment
Below in conjunction with embodiment, the invention will be further described, but be not limited to the following example.
Embodiment 1: negative electrode synthesizes the Bioelectrochemical device of negative oxygen ion, hydrogen and methane as agent structure
Using negative electrode as agent structure, structure extracts discarded object and wastewater reduction can for the synthesis of the Bioelectrochemical device of negative oxygen ion, hydrogen and methane, it comprises the anode chamber 1 as reactor, conduction wall 2, barrier film 3, anode current collector net 4 and anode 5, additional power source 7 or load 6 and external circuit.The gas reservoir 8 that anode chamber 1 establishes water inlet 9, delivery port 10 and gas outlet to connect.Anode chamber 1 seals, for the anaerobic oxidation of discarded object and waste water.Anode chamber is built by the stainless steel of cylindrical shape, and stainless steel wall is simultaneously as negative electrode, and cathode outer side contacts with surrounding air, does not have independently cathode chamber.Be close to barrier film, anode current collector net and anode inside negative electrode.Anode 5 adopts carbon felt to build, barrier film 3 between anode and negative electrode is nonwoven fabrics, in order to reduce resistance, adopt stainless (steel) wire as anode current collector net 4, when electrochemical appliance is with biological fuel cell mode operation, adopt load (6), and when running with biological electrolysis pool mode, adopt stabilized voltage power supply or potentiostat as additional power source (7).Power supply select water quality characteristic according to discarded object and waste water and the oxidation-reduction potential of going back parent pollutant.(see Figure of description 1)
Embodiment 2: independent negative electrode synthesis negative oxygen ion, hydrogen and methane Bioelectrochemical device build
Utilize independent negative electrode to build the electrochemical appliance of synthesis negative oxygen ion, hydrogen and methane, comprise the anode chamber 1 as reactor, conduction wall 2, barrier film 3, anode current collector net 4 and anode 5, additional power source 7 or load 6 and external circuit.The gas reservoir 8 that anode chamber 1 establishes water inlet 9, delivery port 10 and gas outlet to connect.(see Figure of description 2)
Anode chamber 1 adopts engineering plastics to build and seals.The conduction wall 2 i.e. negative electrode made by stainless steel tube, forms independently cathode chamber 11.Negative electrode is embedded in anode chamber as absolute construction, and communicate with the surrounding air of circulation inside negative electrode, cathode outer side and barrier film, anode current collector net and anode are close to.Anode 5 adopts carbon felt, barrier film 3 between anode and negative electrode adopts nonwoven fabrics, in order to reduce resistance, adopt stainless (steel) wire as anode current collector net 4, when electrochemical appliance is with biological fuel cell mode operation, adopt load (6), and when running with biological electrolysis pool mode, adopt stabilized voltage power supply or potentiostat as additional power source (7).Power supply select water quality characteristic according to discarded object and waste water and the oxidation-reduction potential of going back parent pollutant.
Embodiment 3: the multiple devices sharing cathode chamber are in series or in parallel to form integrating device
Device as described in Example 1, combines multiple (at least two) serial or parallel connection, and the reactor that stainless steel conduction wall builds can do assistant anode room, shares an open cathode room communicated with surrounding air.(see Figure of description 3)
Embodiment 4: the multiple devices sharing anode chamber are in series or in parallel to form integrating device
Device as described in Example 2, embeds anode chamber by the independent cathode chamber that multiple (at least two) communicate with surrounding air, shares an anode chamber.(see Figure of description 4)
Embodiment 5: run synthesis negative oxygen ion under biological fuel cell pattern
(1) structure of device
The Bioelectrochemical device that the present embodiment builds is as shown in Figure of description 1, mainly comprise a wastewater anaerobic oxidation reactor (anode chamber) 1, this reactor is cylindrical reactor, high 100mm, external diameter 76mm, wall thickness 1mm, total measurement (volume) is 400mL, and anode is carbon felt (tubular, girth 19.5cm, high 7cm, surface area 136.5cm 2); Separated by nonwoven fabrics between anode and cathode, adopt titanium silk to connect negative electrode and anode, external circuit contact resistance is 100 Ω.Reactor top by rubber stopper seal, and arranges water inlet, delivery port, gas outlet (band unidirectional valve), anaerobic oxidation reactor (anode chamber) dischargeable capacity 300mL.Peristaltic pump is adopted to circulate to the solution in anaerobic oxidation reactor.
(2) electrode biomembrane domestication
Device Anodic carbon felt is put into the biological fuel cell anode room, two room of an independent operating, inoculation anaerobic sludge.Use oxygen as final electron acceptor in cathode chamber.Run after three days, preparation synthesis organic wastewater (containing in 1L waste water: ammonium chloride 0.25g, potassium chloride 0.1g, mineral element solution 10mL, vitamin solution 10mL, anhydrous sodium acetate 1g, two hypophosphite monohydrate sodium dihydrogen 3.04g, disodium hydrogen phosphate dodecahydrate 10.92g), add in anode chamber and run continuously, until anode potential stable maintenance is at-450 ~-480mV(vs.Ag/AgCl), illustrate that electrogenesis microorganism species is formed, the success of anode carbon felt biofilms domestication, then carbon felt is inserted in the Bioelectrochemical device of Fig. 1.
(3) start-up and functionning of device
Above-mentioned for 300mL preparation organic wastewater is filled with in the Bioelectrochemical device anaerobic oxidation reactor (anode chamber) 1 of Fig. 1, is then sealed into the mouth of a river, between anode chamber's control pH4-9.Timing acquiring water sample analysis waste water COD degraded situation, change fresh wastewater depending on the timing of COD degradation situation, after anaerobic oxidation organic wastewater COD load reaches 0.2-0.4gCOD/L.d, device has started.By peristaltic pump flow control reactor water inlet volumetric loading between 0.4-0.6gCOD/L.d, timing detects water outlet COD content, device stable operation 60 days, during this period, detects effluent COD concentration between 30-60mg/L.
(4) detection of negative oxygen ion
The detection of negative oxygen ion is carried out under reactor batch running environment, the Bioelectrochemical device adding 300ml waste water is placed to a 29.8mm × 248mm × 428mm, in the polymethyl methacrylate case of total measurement (volume) 31L.Adopt the negative oxygen ion in AIC-1000 air ion counter detection polymethyl methacrylate cabinet before experiment starts, the mode of being ventilated from air inlet by aeration pump, is detected negative oxygen ion in gas outlet, is then sealed into venthole.Pass into fresh air from air inlet after 24h, detect the negative oxygen ion in gas port air, using the initial examination and measurement data of gas outlet as the negative oxygen ion data in polymethyl methacrylate cabinet.
Result shows, under Laboratory air relative humidity 50% environment, room air negative oxygen ion is at 60-380/cm 3between, the reactor through 24h runs, and in polymethyl methacrylate cabinet, air negative oxgyen ion reaches 2300-4800/cm 3.
Embodiment 6: run synthesis hydrogen, methane and negative oxygen ion under biological electrolysis pool mode
The Bioelectrochemical device that the present embodiment builds and method flow, preparation organic wastewater substantially the same manner as Example 5, stabilized voltage power supply is changed into unlike the load connected by external circuit (resistance), the wherein anode of positive pole of stabilized voltage supply access Bioelectrochemical device anaerobic reactor (anode chamber), negative pole is connected with the conduction stainless steel wall of reactor, and reactor gas outlet connects a gas reservoir.
Device Starting mode is identical with embodiment 5, and result shows, under the electromotive force of additional 400mv, Bioelectrochemical device COD degradation load significantly rises.Adopt a batch operation, its COD degradation load can reach 0.8-1.0g/L.d.Carry out the detection of negative oxygen ion according to the mode of embodiment 5, under Laboratory air relative humidity 50% environment, room air negative oxygen ion is at 80-420/cm 3between, the reactor through 24h runs, and in polymethyl methacrylate cabinet, air negative oxgyen ion reaches 8000-20000/cm 3.
In gas reservoir, gather gaseous sample analysis, in operation in earlier stage, in gaseous sample, density of hydrogen significantly rises, and volume fraction accounts for 30% of cumulative volume.Along with the increase of running time, methane concentration significantly rises, and density of hydrogen is reduced to and disappears completely.During stable operation, every day collects the fermentation gas 80-100ml containing methane, and methane content reaches 60%.
Embodiment 7: run synthesizing methane under biological electrolysis pool mode
Bioelectrochemical device and method flow, preparation organic wastewater and the Starting mode of the present embodiment structure are substantially the same manner as Example 6, unlike wrap insulate adhesive tape and air exclusion outside stainless steel cathode.Result shows, under additional 400mv electromotive force, COD degradation load reaches 0.8-1.2g/L.d.During stable operation, the fermentation gas that every day collects containing methane is about 100-120ml, and methane content reaches 70%.
A kind of Bioelectrochemical device and method extracting also proper energy from discarded object and waste water of the present invention, be described by concrete example, those skilled in the art can use for reference content of the present invention, the links such as appropriate change raw material, process conditions realize other object corresponding, its relevant change does not all depart from content of the present invention, all similar replacements and change will become apparent to those skilled in the art that and be all deemed to be included within scope of the present invention.

Claims (4)

1. from discarded object and waste water, extract a bioelectrochemistry integrating device for also proper energy, it is characterized in that, described bioelectrochemistry integrating device comprises two or more Bioelectrochemical device, and is in parallel between multiple device or is connected in series; Described Bioelectrochemical device comprises the anode chamber (1) as reactor, conduction wall (2), barrier film (3), anode (5), external circuit, and load (6) or additional power source (7); Described conduction wall (2) is the negative electrode of reactor, and negative electrode is as reactor body structure or be embedded in anode chamber as independent negative electrode; The reactor that described conduction wall builds, as assistant anode room, shares an open cathode room communicated with surrounding air.
2. bioelectrochemistry integrating device according to claim 1, is characterized in that, the embedded independent cathode chamber communicated with surrounding air shares an anode chamber.
3., according to the bioelectrochemistry integrating device of claim 1 or 2, it is characterized in that, in Bioelectrochemical device, when negative electrode is as reactor body structure, form sealing anode chamber, cathode outer side contacts with outside ambient air, is close to inside negative electrode with barrier film and anode; When negative electrode is embedded in anode chamber as absolute construction, communicate with the surrounding air of circulation inside negative electrode, cathode outer side is close to barrier film and anode, and whole anode chamber is in sealing state.
4. according to the bioelectrochemistry integrating device of claim 1 or 2, it is characterized in that, in Bioelectrochemical device, anode chamber (1) establishes water inlet (9), delivery port (10), gas outlet, and the gas reservoir (8) be connected with gas outlet.
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