CN103979688A - Microbial fuel cell coupling electrode bio-membrane nitrogen and phosphorus removal system and application - Google Patents
Microbial fuel cell coupling electrode bio-membrane nitrogen and phosphorus removal system and application Download PDFInfo
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- CN103979688A CN103979688A CN201410226404.2A CN201410226404A CN103979688A CN 103979688 A CN103979688 A CN 103979688A CN 201410226404 A CN201410226404 A CN 201410226404A CN 103979688 A CN103979688 A CN 103979688A
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Abstract
The invention discloses an ecological type microbial fuel cell coupling electrode bio-membrane system with enhanced nitrogen and phosphorus removal. The system consists of an E-MFC subsystem and a BER subsystem, wherein the E-MFC subsystem comprises an E-MFC reaction tank, an E-MFC water inlet, an E-MFC water outlet, a non-conductive matrix, an E-MFC anode electrode, an E-MFC cathode electrode and plants; the BER subsystem comprises a BER reaction tank, a BER water inlet, a BER water outlet, a BER anode electrode and a BER cathode electrode. The invention also discloses an ecological type MFC coupling BER enhanced sewage nitrogen and phosphorus removal method, and also discloses an application of the system in enhancement of sewage treatment. The ecological type MFC coupling BER makes full use of electric energy generated by MFC to enhance the nitrogen and phosphorus removal effect of BER, so that chemical medicaments are not used, and energy sources are saved; the microbial fuel cell coupling electrode bio-membrane nitrogen and phosphorus removal system is a low-carbon water pollution control technology.
Description
Technical field
The invention belongs to the energy and water treatment field, be specifically related to a kind of microbiological fuel cell coupling electrode microbial film dephosphorization denitrogenation system and application.
Background technology
In recent years, along with being widely used of chemical fertilizer, washing composition, agricultural chemicals and various other chemical substances, organism, the content of nitrogen and phosphorous in municipal effluent constantly increase, huge for the treatment of the power consumption of sewage.At present, one of the focus in water pollution control field be by microorganism electricity generation application of principle in sewage treatment process, utilize microbiological fuel cell (Microbial Fuel Cells, MFCs) when purifying waste water, to gather in the crops electric energy, can alleviate to a certain extent energy problem.
Utilize the technology of organism production capacity to compare with existing other, microbiological fuel cell has the advantage of operation above and in function: first, it is converted into electric energy by substrate, has guaranteed to have high energy conversion efficiency; Secondly, be different from existing all bioenergys and process, microbiological fuel cell can effective operation under normal temperature environment condition; The 3rd, microbiological fuel cell does not need to carry out off gas treatment, because the main ingredient of the waste gas that it produces is carbonic acid gas, does not have recycling energy under general condition; The 4th, microbiological fuel cell does not need input compared with macro-energy, if because single-chamber microbial fuel cell only need to ventilate just can be passive supplementary cathode gas; The 5th, in the partial area that lack power infrastructures, microbiological fuel cell has the potentiality of widespread use, has also expanded and has been used for meeting our diversity to the fuel of energy demand simultaneously.
But the electrogenesis power of microbiological fuel cell is lower, can only export low-tension current.At present about the principle of microbiological fuel cell, launched large quantity research, but the applied research that it is produced to electric energy is still in the exploratory stage.In addition, microbiological fuel cell is general to the removal efficiency of nitrogen, very low to the removal efficiency of phosphorus, and dephosphorization and denitrification effect also needs further reinforcement.
Summary of the invention
Goal of the invention: for the defect of prior art, the object of this invention is to provide a kind of environmental microbiological fuel cell coupling electrode biofilm system that utilizes the microbial augmentation dephosphorization denitrogenations such as electrogenesis bacterium, denitrifying bacteria of with low cost, environmental protection.
Technical scheme: in order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of environmental microbiological fuel cell coupling electrode biofilm system of reinforced phosphor-removing denitrifying, this system is comprised of E-MFC subsystem and BER subsystem, described E-MFC subsystem comprises E-MFC reaction tank, be located at the E-MFC water-in of E-MFC reaction tank bottom one side, be located at the E-MFC water outlet of E-MFC reaction tank top one side, be layed in nonconducting matrix of E-MFC reaction tank bottom, be placed in the E-MFC anode electrode of nonconducting matrix, be positioned at the E-MFC cathode electrode at E-MFC reaction tank top, plant in the plant of E-MFC cathode electrode surface, described BER subsystem comprises BER reaction tank, be located at the BER water-in of BER reaction tank bottom one side, be located at the E-MFC water outlet of BER reaction tank top one side, be arranged in BER anode electrode and the BER cathode electrode of BER reaction tank, described E-MFC water outlet is connected with BER water-in, described E-MFC anode electrode is connected with BER cathode electrode by the first wire, described E-MFC cathode electrode is connected with BER anode electrode by the second wire.
Further, described E-MFC cathode electrode is stainless steel plate with holes, and stainless steel plate with holes bottom is fixed with stainless steel strip, the mutual vertical engagement of Stainless Steel Wire and stainless steel strip, and Stainless Steel Wire and stainless steel strip are all fixed by welding on stainless steel plate with holes.
Further, the bottom of described E-MFC cathode electrode is provided with the felt near root system of plant, is suspended on Stainless Steel Wire, for a large amount of microorganisms provide the carrier of apposition growth.
Further, described E-MFC anode electrode is graphite cake.
Further, described nonconducting matrix is one or both in gravel and shale.
Further, described plant is mater convolvulus in summer and autumn, and winter-spring season is Wildcelery Herb.
Further, described BER cathode electrode is graphite felt.
Further, described BER reaction tank is than the low 10-15cm of the liquid level of E-MFC reaction tank.
Active sludge is seeded in BER reaction tank, and energising biofilm is tamed in gathering denitrifying bacterium.
E-MFC subsystem of the present invention utilizes electrogenesis microbiological deterioration organism to produce electric energy, and for BER subsystem provides the substrate of easy degraded, comprises nitric nitrogen and phosphoric acid salt; BER subsystem utilizes the electric energy of E-MFC generation to the further denitrification denitrogenation of sewage, and removes phosphoric acid salt.
Above-mentioned system is carried out the method for enhanced sewage phosphorous removal denitrogenation, sewage enters E-MFC reaction tank from E-MFC water-in, microorganism in E-MFC reaction tank is converted into nitric nitrogen by the organonitrogen in sewage, organophosphorus is converted into phosphoric acid salt, in the process of oxidation of organic compounds, produce electronics and proton, electronics passes to the BER cathode electrode of BER subsystem by E-MFC anode electrode, BER cathode electrode by BER subsystem passes to BER anode electrode again, through external circuit, pass to the E-MFC cathode electrode of E-MFC subsystem, form loop, generation current, proton is delivered to E-MFC cathode electrode through water, without proton exchange membrane, under the low dc voltage electro ultrafiltration of E-MFC output, on the negative electrode of BER, there is micro-electrolysis and produce hydrogen, hydrogen is inner toward outside diffusion from microbial film, under the katalysis of enzyme, the autotrophic denitrification bacterium of cathode surface efficiently utilizes reduction-state hydrogen as electron donor, and heterotrophic denitrifying Bacteria utilizes organism in water as electron donor, anti-nitration reaction occurs and make nitrate-nitrogen reduction, remove a part of COD, the Fe of anode electrode generates Fe simultaneously
2+, be oxidized by oxygen into Fe subsequently
3+, the PO in sewage
4 3-and HPO
4 2-with Fe
2+, Fe
3+reaction generates the very little ferrophosphorus compound of solubleness, and the ironic hydroxide that Fe forms after anode is by electrolysis has good throwing out, by precipitation separation, effectively removes phosphorus.
The application of the environmental microbiological fuel cell coupling electrode biofilm system of above-mentioned a kind of reinforced phosphor-removing denitrifying aspect enhanced sewage processing.
Beneficial effect: compared with prior art, the present invention has following characteristic and advantage:
1. the present invention utilizes the microorganism in MFC that the organonitrogen in sewage is converted into nitric nitrogen, organophosphorus is converted into phosphoric acid salt, for anti-nitration reaction and the dephosphorization of BER subsystem negative electrode provides substrate, promotes the carrying out of reaction, also, for BER subsystem provides electric energy, reduce the input of external energy.
2. the present invention has improved efficiency of fuel cell generation.The negative electrode serike of MFC, rhizosphere is secreted the growth that oxygen is conducive to rhizospheric microorganism, and felt provides apposition growth carrier for a large amount of microorganisms, promotes that ammonia nitrogen changes nitrate nitrogen into, thereby is conducive to the denitrification denitrogenation reaction in follow-up BER.
3. environmental microbiological fuel cell of the present invention (E-MFC) coupling electrode microbial film (BER) system floor space is little, technical process is simple, in the effect that does not need to obtain under the condition refluxing reinforced phosphor-removing denitrifying, operational management is convenient, do not add chemical agent, do not need additional energy source yet.
Accompanying drawing explanation
Fig. 1 is E-MFC coupling BER device front view of the present invention;
Fig. 2 stainless steel plate with holes (pros and cons) vertical view;
Fig. 3 E-MFC device side-view.
Embodiment
Below by specific embodiment, the present invention is further described; it should be pointed out that for the person of ordinary skill of the art, under the premise without departing from the principles of the invention; can also make some modification and improvement, these also should be considered as belonging to protection scope of the present invention.
Embodiment 1:
As shown in Figure 1, a kind of environmental microbiological fuel cell coupling electrode biofilm system of reinforced phosphor-removing denitrifying, this system is comprised of E-MFC subsystem and BER subsystem, described E-MFC subsystem comprises E-MFC reaction tank, be located at the E-MFC water-in 1 of E-MFC reaction tank bottom one side, be located at the E-MFC water outlet 2 of E-MFC reaction tank top one side, be layed in nonconducting matrix 5 of E-MFC reaction tank bottom, be placed in the E-MFC anode electrode 9 of nonconducting matrix 5, be positioned at the E-MFC cathode electrode 7 at E-MFC reaction tank top, plant in the plant 8 on E-MFC cathode electrode 7 surfaces, described BER subsystem comprises BER reaction tank, be located at the BER water-in 3 of BER reaction tank bottom one side, be located at the E-MFC water outlet 4 of BER reaction tank top one side, be arranged in BER anode electrode 11 and the BER cathode electrode 12 of BER reaction tank, described E-MFC water outlet 2 is connected with BER water-in 3, described E-MFC anode electrode 9 is connected with BER cathode electrode 12 by the first wire 10, described E-MFC cathode electrode 7 is connected with BER anode electrode 11 by the second wire 15.The bottom of E-MFC cathode electrode 7 is provided with the fixedly felt 6 of plant 8, and E-MFC anode electrode 9 is graphite cake.Nonconducting matrix 5 is gravel.Plant 8 is mater convolvulus in summer and autumn, and winter-spring season is Wildcelery Herb.As shown in Figure 2, E-MFC cathode electrode 7 is stainless steel plate with holes, stainless steel plate with holes bottom is fixing with stainless steel strip 13, Stainless Steel Wire 14 and the mutual vertical engagement of stainless steel strip 13, Stainless Steel Wire 14 is all fixed by welding on stainless steel plate with holes with joint and the stainless steel strip 13 of stainless steel strip 13.Felt 6 vertical hangings are fixed on the Stainless Steel Wire 14 of E-MFC cathode electrode 7 belows, and the root system of plant 8 is close to felt 6, and felt 6 surfaces provide apposition growth carrier for a large amount of rhizospheres and non-rhizospheric microbe, and BER cathode electrode 12 is graphite felt.BER reaction tank is than the low 15cm of the liquid level of E-MFC reaction tank.
Above-mentioned system is carried out the method for enhanced sewage phosphorous removal denitrogenation, sewage enters E-MFC reaction tank from E-MFC water-in 1, microorganism in E-MFC reaction tank is converted into nitric nitrogen by the organonitrogen in sewage, organophosphorus is converted into phosphoric acid salt, in the process of oxidation of organic compounds, produce electronics and proton, electronics passes to the BER cathode electrode 12 of BER subsystem by E-MFC anode electrode 9, BER cathode electrode 12 by BER subsystem passes to BER anode electrode 11 again, through external circuit, pass to the E-MFC cathode electrode 7 of E-MFC subsystem, form loop, generation current, proton is delivered to E-MFC cathode electrode 7 through water, with H
+, O
2reaction generates H
2o, without proton exchange membrane, the sewage of processing through MFC flows into BER water-in 3 from water outlet 2 under the effect of difference of altitude, the BER subsystem starting period adopts energising biofilm, make denitrifying bacteria be attached in graphite felt and be subject to electric current domestication, run duration, under the low dc voltage electro ultrafiltration of E-MFC output, on the negative electrode of BER, there is micro-electrolysis and produce hydrogen, hydrogen is inner toward outside diffusion from microbial film, under the katalysis of enzyme, the autotrophic denitrification bacterium of cathode surface efficiently utilizes reduction-state hydrogen as electron donor, heterotrophic denitrifying Bacteria utilizes organism in water as electron donor, anti-nitration reaction occurs and make nitrate-nitrogen reduction, remove a part of COD simultaneously, the Fe of anode electrode generates Fe
2+, be oxidized by oxygen into Fe subsequently
3+, the PO in sewage
4 3-and HPO
4 2-with Fe
2+, Fe
3+reaction generates the very little ferrophosphorus compound of solubleness, and the ironic hydroxide that Fe forms after anode is by electrolysis has good throwing out, by precipitation separation, effectively removes phosphorus.Finally, the sewage after BER processes flows out through water outlet 4.
Embodiment 2:
Substantially the same with embodiment 1, difference is, BER reaction tank is than the low 10cm of the liquid level of E-MFC reaction tank.Nonconducting matrix 5 is shale.
Embodiment 3:
Substantially the same with embodiment 1, difference is, BER reaction tank is than the low 15cm of the liquid level of E-MFC reaction tank.Nonconducting matrix 5 is the mixture of shale and gravel.
Above are only the preferred embodiment of the invention, be not restricted to the present invention.To those of ordinary skill in the art, can also make on the basis of the above description other multi-form variation or changes.Here without also cannot all embodiment being illustrated.And the apparent variation that scheme is extended out thus or change are still within protection scope of the present invention.
Claims (10)
1. the environmental microbiological fuel cell coupling electrode biofilm system of a reinforced phosphor-removing denitrifying, it is characterized in that, this system is comprised of E-MFC subsystem and BER subsystem, described E-MFC subsystem comprises E-MFC reaction tank, be located at the E-MFC water-in (1) of E-MFC reaction tank bottom one side, be located at the E-MFC water outlet (2) of E-MFC reaction tank top one side, be layed in nonconducting matrix (5) of E-MFC reaction tank bottom, be placed in the E-MFC anode electrode (9) of nonconducting matrix (5), be positioned at the E-MFC cathode electrode (7) at E-MFC reaction tank top, plant in the plant (8) on E-MFC cathode electrode (7) surface, described BER subsystem comprises BER reaction tank, be located at the BER water-in (3) of BER reaction tank bottom one side, be located at the E-MFC water outlet (4) of BER reaction tank top one side, be arranged in BER anode electrode (11) and the BER cathode electrode (12) of BER reaction tank, described E-MFC water outlet (2) is connected with BER water-in (3), described E-MFC anode electrode (9) is connected with BER cathode electrode (12) by the first wire (10), described E-MFC cathode electrode (7) is connected with BER anode electrode (11) by the second wire (15).
2. the environmental microbiological fuel cell coupling electrode biofilm system of a kind of reinforced phosphor-removing denitrifying according to claim 1, it is characterized in that, described E-MFC cathode electrode (7) is stainless steel plate with holes, stainless steel plate with holes bottom is fixing with stainless steel strip (13), Stainless Steel Wire (14) and the mutual vertical engagement of stainless steel strip (13), Stainless Steel Wire (14) is all fixed by welding on stainless steel plate with holes with joint and the stainless steel strip (13) of stainless steel strip (13).
3. the environmental microbiological fuel cell coupling electrode biofilm system of a kind of reinforced phosphor-removing denitrifying according to claim 2, it is characterized in that, the bottom of described E-MFC cathode electrode (7) is provided with the felt (6) near plant (8) root system, it is upper that felt (6) is suspended on Stainless Steel Wire (14), for a large amount of microorganisms provide the carrier of apposition growth.
4. the environmental microbiological fuel cell coupling electrode biofilm system of a kind of reinforced phosphor-removing denitrifying according to claim 1, is characterized in that, described E-MFC anode electrode (9) is graphite cake.
5. the environmental microbiological fuel cell coupling electrode biofilm system of a kind of reinforced phosphor-removing denitrifying according to claim 1, is characterized in that, described nonconducting matrix (5) is one or both in gravel and shale.
6. the environmental microbiological fuel cell coupling electrode biofilm system of a kind of reinforced phosphor-removing denitrifying according to claim 1, is characterized in that, described plant (8) is mater convolvulus in summer and autumn, and winter-spring season is Wildcelery Herb.
7. the environmental microbiological fuel cell coupling electrode biofilm system of a kind of reinforced phosphor-removing denitrifying according to claim 1, is characterized in that, described BER cathode electrode (12) is graphite felt.
8. the environmental microbiological fuel cell coupling electrode biofilm system of a kind of reinforced phosphor-removing denitrifying according to claim 1, is characterized in that, described BER reaction tank is than the low 10-15cm of the liquid level of E-MFC reaction tank.
9. the method that the system described in claim 1～8 any one is carried out enhanced sewage phosphorous removal denitrogenation, it is characterized in that, sewage enters E-MFC reaction tank from E-MFC water-in (1), microorganism in E-MFC reaction tank is converted into nitric nitrogen by the organonitrogen in sewage, organophosphorus is converted into phosphoric acid salt, in the process of oxidation of organic compounds, produce electronics and proton, electronics passes to the BER cathode electrode (12) of BER subsystem by E-MFC anode electrode (9), BER cathode electrode (12) by BER subsystem passes to BER anode electrode (11) again, through external circuit, pass to the E-MFC cathode electrode (7) of E-MFC subsystem, form loop, generation current, proton is delivered to E-MFC cathode electrode (7) through water, without proton exchange membrane, under the low dc voltage electro ultrafiltration of E-MFC output, on the negative electrode of BER, there is micro-electrolysis and produce hydrogen, hydrogen is inner toward outside diffusion from microbial film, under the katalysis of enzyme, the autotrophic denitrification bacterium of cathode surface efficiently utilizes reduction-state hydrogen as electron donor, and heterotrophic denitrifying Bacteria utilizes organism in water as electron donor, anti-nitration reaction occurs and make nitrate-nitrogen reduction, remove a part of COD, the Fe of anode electrode generates Fe simultaneously
2+, be oxidized by oxygen into Fe subsequently
3+, the PO in sewage
4 3-and HPO
4 2-with Fe
2+, Fe
3+reaction generates the very little ferrophosphorus compound of solubleness, and the ironic hydroxide that Fe forms after anode is by electrolysis has good throwing out, by precipitation separation, effectively removes phosphorus.
10. the application of the environmental microbiological fuel cell coupling electrode biofilm system of a kind of reinforced phosphor-removing denitrifying described in claim 1～8 any one aspect enhanced sewage processing.
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| CN105060619A (en) * | 2015-07-22 | 2015-11-18 | 清华大学 | Apparatus for treating degradation-resistant organic wastewater and use thereof |
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| CN111423063A (en) * | 2020-04-13 | 2020-07-17 | 西安建筑科技大学 | Device and method for synchronously removing carbon, nitrogen and phosphorus from wastewater by using bioelectrochemical system |
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