CN201634549U - Three-dimensional electrode biofilm reactor of reproducing nitric oxide complex absorbing agents - Google Patents

Three-dimensional electrode biofilm reactor of reproducing nitric oxide complex absorbing agents Download PDF

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Publication number
CN201634549U
CN201634549U CN2010201299249U CN201020129924U CN201634549U CN 201634549 U CN201634549 U CN 201634549U CN 2010201299249 U CN2010201299249 U CN 2010201299249U CN 201020129924 U CN201020129924 U CN 201020129924U CN 201634549 U CN201634549 U CN 201634549U
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electrode
edta
biofilm reactor
reaction vessel
positive electrode
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CN2010201299249U
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李伟
高琳
糜徐红
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The utility model discloses a three-dimensional electrode biofilm reactor of reproducing nitric oxide complex absorbing agents, which comprises a reaction vessel, wherein the inside of the reaction vessel is separated into an anode region and a cathode region through a porous circular sleeve tube, a positive electrode is arranged in the anode region, 4 to 8 negative electrodes which are uniformly distributed around the positive electrode are arranged in the cathode region, conductive particles are filled around the cathodes in the cathode region, and the positive electrode, the negative electrodes and the conductive particles filled in the cathode region form a three-dimensional electrode. The three-dimensional electrode biofilm reactor of the utility model can be used for complexing and absorbing smoke gas for denitration, mixed mycoderm on the surfaces of the cathode conductive particles can be used for simultaneously reducing nitric oxides and complexing and absorbing Fe(II)EDTA-NO and Fe(III)EDTA in products through the electric promotion microbial effect to obtain Fe(II)EDTA, and the reproduction of the complex absorbing agents can be realized. In addition, the utility model has the advantages of low energy consumption, simple structure and low manufacture cost.

Description

A kind of three-diemsnional electrode biofilm reactor of regenerating nitrogen oxide complexed absorption agent
Technical field
The utility model relates to the environmental pollution improvement field, refers to a kind of three-diemsnional electrode biofilm reactor that is used for the regenerating nitrogen oxide complexed absorption agent of denitrating flue gas particularly.
Background technology
NO xIt is the one of the main reasons that causes a series of serious air pollution problems inherent such as acid rain, photo-chemical smog.At present, China's thermoelectricity industry nitrogen oxide emission is huge, presses for control." the discharged nitrous oxides control techniques project study report of Chinese thermal power plant " of Chinese environmental protection industry association tissue shows, the oxynitride total amount of power plants discharging in 2007 has increased to 8,400,000 tons, increased closely 40.6% than 597.3 ten thousand tons in 2003, accounted for 35%~40% of national nitrogen oxide emission.Because smoke discharge amount is big, and NO in the flue gas xThe solubleness of main component nitrogen protoxide (accounting for 95%) in water very low, intractability is bigger.So far, NH only in the world 3SCR (SCR) and selective non-catalytic reduction (SNCR) industrial applications that obtained certain scale.But existing these two kinds of technology still exist the Financial cost height, produce defectives such as secondary pollution or processing efficiency are low (RadojevicM, " Environ.Pollut. ", 1998,102,685-689).Thereby, develop new gas denitrifying technology and become one of research focus of field of environment protection.
The Japan and the U.S. just add ferrous sequestrant since the seventies in 20th century and carry out the while desulfurization removing nitric in the washings of flue gas desulphurization system.Add Fe (II) EDTA complexed absorption NO and generate Fe (II) EDTA-NO, can significantly improve the rate of mass transfer of NO from the gas phase to the liquid phase.And problem is that Fe (II) EDTA is easy to be oxidized to Fe (III) EDTA that does not have complexing NO ability, and the agent of Fe (II) EDTA complexed absorption is difficult to regeneration and recycle.Utilize the nitrogen oxide complexed absorption product of micro-reduction (mixed system that mainly constitutes) by Fe (II) EDTA-NO and Fe (III) EDTA, can solve the regeneration problem of absorption agent well, so complexed absorption-biological reducing denitrating flue gas arises at the historic moment.But (Li W, " Chem.Techno.Biotechnol. ", 2006,81,306~311 are found in correlative study; Li W, " Environ.Sci.Techno. ", 2007,41,639-644), the reduction efficiency of Fe (II) EDTA-NO and Fe (III) EDTA is the key of system's continous-stable running, and how to improve microorganism active, and strengthen rate of reduction, become the task of top priority of this technical development.
The electrode biomembrane reactor has had suitable application in the waste water denitrification denitrogenation, correlative study person is by improving electrode structure, especially adopt gac or carbon fiber to make cathode material, more make current efficiency and denitrification efficient have and promote (Prosnansky M significantly, " Wat.Res. ", 2002,36 (1), 4801-481).Through improved electrode biomembrane reactor to NO 3 -Reduction effect quite high, realized the short period of time efficient denitrification.The electrode biomembrane reactor is at the NO that is applied as of waste water denitrification denitrogenation xThe processing of complexed absorption product provides new approaches.People's such as Mi Xuhong research has adopted the electrode biomembrane reactor that Fe (III) EDTA is reduced to Fe (II) EDTA, the reduction efficiency of Fe (III) EDTA can reach 90% (Mi X H in such less energy-consumption reactor, " Bioresour.Techno. ", 100 (2009), 2940~2944).But this reactor has only been realized the reduction to Fe (III) EDTA, just need realize reduction to Fe (II) EDTA-NO and Fe (III) EDTA simultaneously and will be used for complexed absorption-biological reducing denitrating flue gas method.
Summary of the invention
The utility model provides the three-diemsnional electrode biofilm reactor that is used for regenerating nitrogen oxide complexed absorption agent that a kind of energy consumption is low, efficient is high, simple in structure.
A kind of three-diemsnional electrode biofilm reactor of regenerating nitrogen oxide complexed absorption agent comprises reaction vessel, is separated into anode region and cathode zone by circular sleeve with holes in the described reaction vessel; Be provided with a positive electrode in the described anode region, be provided with in the described cathode zone around the equally distributed 4-8 root of positive electrode negative potential, filled conductive particle in the described cathode zone, positive electrode, negative potential and the conducting particles formation three-diemsnional electrode that is filled in cathode zone.
Described reaction vessel main body is cylindrical, and the bottom is conical, and the top is provided with top cover, and described top cover is provided with thief hatch and air outlet, and the bottom and the sidewall of reaction vessel are provided with the mouth of pipe.
Described positive electricity is carbonaceous material very, and negative electricity is carbonaceous material or metal material very.
Described fragmental conducting particles can select for use fragmental conductive particles such as agraphitic carbons such as gac, hard coal or carbon fiber, metal, vitreous carbon to make.
Three-diemsnional electrode is filled the fragmental conductive particle and is made on the two-dimensional electrode basis.Positive electricity is carbonaceous material very, is positioned at reactor center; Negative electricity is carbonaceous material or metal material very, is uniformly distributed in the reactor edge around positive electrode; The particle filled composite of cathode zone is the fragmental electro-conductive material, is filled in around the negative carbon.Reactor is provided with the circular sleeve of separating anode and cathode, and conducting particles is fixed on cathode zone; Uniform aperture on the sleeve can make solution be full of whole reactor.Positive and negative electrode all is fixed on reactor top and covers, and sleeve and particle filled composite then are positioned at inside reactor.Particle filled composite is not only the granule electrode of three-diemsnional electrode, the carrier that can also adhere to as microbial film.After the mixed culture of inoculation iron-reducing bacterium and denitrifying bacteria carried out biofilm to 3 D electrode reactor, the mixed bacterium of iron-reducing bacterium and denitrifying bacteria will be grown in the filler particles surface of cathode zone.
With Fe (II) EDTA is oxynitride in the absorption agent complexed absorption flue gas, generates Fe (II) EDTA-NO; Because contain part oxygen in the flue gas, part Fe (II) EDTA can be oxidized to Fe (III) EDTA in absorption process, thereby has Fe (II) EDTA-NO and Fe (III) EDTA in the nitrogen oxide complexed absorption product simultaneously simultaneously.After treating that biofilm is finished, the complexed absorption product is added in the reactor, add substratum and energising then, Fe (II) EDTA-NO and Fe (III) EDTA that can utilize electrode biomembrane to pass through in the nitrogen oxides reduction complexed absorption product of short action of microorganisms while of electricity obtain Fe (II) EDTA, realize the regeneration of Fe (II) EDTA.Reaction principle is as follows:
The electrode reaction formula is:
Positive C+2H 2O → CO 2+ 4H ++ 4e (e 0=0.207v);
Negative electrode 2H 2O+2e → H 2+ 2OH -(e 0=0.000v)
Is example with glucose as carbon source and electron donor, and its biochemical reaction formula is:
With hydrogen is that electron donor, inorganic carbon are carbon source, and its biochemical reaction formula is:
The utility model three-diemsnional electrode biofilm reactor is filled the fragmental conducting particles around negative electrode, increased the specific surface area of reaction interface on the one hand, and mass transfer effect improves, and has improved current efficiency; Particle filled composite can be used as the biological attachment carrier on the other hand, has improved biological film forming speed and performance.Thereby this utility model reactor reduction complexing absorption product well, and energy consumption is little, and simple in structure, cheap for manufacturing cost.
Description of drawings
Fig. 1 is the structural representation of the utility model three-diemsnional electrode biofilm reactor.
Embodiment
As shown in Figure 1, a kind of three-diemsnional electrode biofilm reactor that is used for the regenerating nitrogen oxide complexed absorption agent of denitrating flue gas, comprise reaction vessel 1, the reaction vessel main body is cylindrical, the bottom is taper, and (voidage is about 33% to the about 1L of built-in activated carbon granule, i.e. the about 0.6L of gac actual volume, the cumulative volume of filling is about 1L), effective volume is 1L.The reaction vessel top cover adopts flange to be connected with main body.
The top cover of reaction vessel 1 is provided with thief hatch 6 and venting port 7, can in time grasp the internal-response situation.
Reaction vessel 1 bottom is provided with water-in 8, and sidewall is provided with water outlet 9.When the reactor preface was criticized operation, by 6 application of samples of the thief hatch on the top cover, peristaltic pump 10 connected the mouth of pipe of sidewall and bottom, was circulated and stirred mixing solutions; When reactor moves continuously, control flow velocity simultaneously by peristaltic pump 10 sample introductions, the bottom mouth of pipe 8 is a water-in, and sidewall upper orifice 9 is a water outlet, and the material that sustainable interpolation reaction is required is as substratum etc.Preface is criticized operation and is operated on this reactor continuously and all can realize.
Reaction vessel 1 center is provided with 1 graphite positive electrode 2, the edge is provided with 4~8 and evenly divides and round the graphite negative potential 3 of positive electrode 2, fill activated carbon granule 4 around the negative potential, be provided with narrow meshed round plastic sleeve 5 in the reaction vessel 1, activated carbon granule is fixed on cathode zone.Positive electrode also can be made by other carbonaceous materials such as carbon fiber felts, and negative potential also can be made by metallic conductor except that carbonaceous material.Particle filled composite also can be made by other fragmental electro-conductive materials, as: other decolorizing carbon such as hard coal, carbon fiber, metal, graphite granule or vitreous carbon.
During work, positive electrode 2 and negative potential 3 are connected to the positive pole and the negative pole of power supply 11 respectively.
The electrode biomembrane reactor principle of work of the foregoing description is as follows:
(1) mixed culture of reactor inoculation denitrifying bacteria and iron-reducing bacterium progressively increases little electric current and reduces carbon source concentration in the substratum simultaneously, carries out the biofilm of electrode surface microorganism, and denitrifying bacteria and iron-reducing bacterium mixed bacterium will be attached to activated carbon granule 4 surfaces.
(2) in the reaction vessel 1 that biofilm is finished, pour the pending mixing solutions that contains Fe (II) EDTA-NO and Fe (III) EDTA into, add a little electrons donor and carbon source (as glucose etc.) and substratum then.
(3) at last reactor 1 is carried out heating in water bath, connect power supply, finish until reaction.
Substratum (mg/L): carbon source (glucose) 1500, KH 2PO 4300, Na 2SO 370, MgCl 2100, NaHCO 35400, CaCl 22, CoCl 20.48, MnCl 24H 2O 1.98, CuSO 45H 2O 0.5, Na 2MoO 42H 2O 0.44, NiCl 26H 2O 0.38, H 3BO 40.028, ZnCl 20.2.

Claims (4)

1. the three-diemsnional electrode biofilm reactor of a regenerating nitrogen oxide complexed absorption agent comprises reaction vessel, it is characterized in that: be separated into anode region and cathode zone by circular sleeve with holes in the described reaction vessel; Be provided with a positive electrode in the described anode region, be provided with in the described cathode zone, filled conductive particle in the described cathode zone around the equally distributed 4-8 root of positive electrode negative potential; Positive electrode, negative potential and the conducting particles formation three-diemsnional electrode that is filled in cathode zone.
2. three-diemsnional electrode biofilm reactor as claimed in claim 1 is characterized in that: described reaction vessel main body is cylindrical, and the bottom is conical, and the top is provided with top cover; Described top cover is provided with thief hatch and air outlet, and the bottom and the sidewall of reaction vessel are provided with the mouth of pipe.
3. three-diemsnional electrode biofilm reactor as claimed in claim 1 is characterized in that: described positive electricity is carbonaceous material very, and described negative electricity is carbonaceous material or metal material very.
4. three-diemsnional electrode biofilm reactor as claimed in claim 1 is characterized in that: described fragmental conducting particles is agraphitic carbon carbon fiber, graphite granule, metal or vitreous carbon.
CN2010201299249U 2010-03-12 2010-03-12 Three-dimensional electrode biofilm reactor of reproducing nitric oxide complex absorbing agents Expired - Lifetime CN201634549U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102553434A (en) * 2012-03-06 2012-07-11 浙江大学 Device and method for purifying nitrogen oxides in flue gas by utilizing electrode biological membrane
CN103230734A (en) * 2013-04-19 2013-08-07 上海交通大学 Method for combined removal of sulfur dioxide and nitrogen oxide in flue gas
CN103420456A (en) * 2013-05-15 2013-12-04 上海理工大学 Method for removing ammonia nitrogen by three-dimensional electrode
CN105032168A (en) * 2015-07-13 2015-11-11 华南理工大学 Device and method for removing nitrogen oxides
CN107487908A (en) * 2017-08-15 2017-12-19 广东博地环境工程有限公司 One kind fluidisation pole plate electric flocculation reactor and its method of work

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102553434A (en) * 2012-03-06 2012-07-11 浙江大学 Device and method for purifying nitrogen oxides in flue gas by utilizing electrode biological membrane
CN103230734A (en) * 2013-04-19 2013-08-07 上海交通大学 Method for combined removal of sulfur dioxide and nitrogen oxide in flue gas
CN103230734B (en) * 2013-04-19 2016-03-02 上海交通大学 Combine the method removing sulfur dioxide in flue gas and nitrogen oxide
CN103420456A (en) * 2013-05-15 2013-12-04 上海理工大学 Method for removing ammonia nitrogen by three-dimensional electrode
CN105032168A (en) * 2015-07-13 2015-11-11 华南理工大学 Device and method for removing nitrogen oxides
CN107487908A (en) * 2017-08-15 2017-12-19 广东博地环境工程有限公司 One kind fluidisation pole plate electric flocculation reactor and its method of work

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