CN101857309B - Electrochemical biological combined denitrification reactor - Google Patents
Electrochemical biological combined denitrification reactor Download PDFInfo
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- CN101857309B CN101857309B CN2010102011407A CN201010201140A CN101857309B CN 101857309 B CN101857309 B CN 101857309B CN 2010102011407 A CN2010102011407 A CN 2010102011407A CN 201010201140 A CN201010201140 A CN 201010201140A CN 101857309 B CN101857309 B CN 101857309B
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses an electrochemical biological combined denitrification reactor, which comprises a tank body, an electrode plate, a particle electrode, an aerating apparatus and a constant current transformer. Both ends of the tank body are respectively provided with a water inlet and a water outlet. The electrode plate comprises an anode arranged on the center part of the tank body and a cathode which surrounds the anode to be arranged at the position close to the tank wall; the anode and the cathode are respectively connected with an anode and a cathode of the constant current transformer; the particle electrode is filled between the anode and the cathode; and the aerating apparatus comprises a fine bubble aerator arranged on the bottom of the tank body and an air pump connected with the fine bubble aerator. The device of the invention has compact and simple structure, small occupied area, high current utilization rate and rapid biofilm formation of microbe, can simultaneously remove various pollutants, such as organic matter, ammonia nitrogen and the like, has high denitrification efficiency and low energy consumption, is easy to regulate and control and is a multiple three-dimensional electrode biomembrane sewage treatment device integrating biology with an electric microfield into whole body.
Description
Technical field
The present invention relates to sewage water denitrification treatment reactor field, especially a kind ofly adopt multiple three-diemsnional electrode biomembrance process to strengthen the electrochemical biological combined denitrification reactor of little electrolysis nitrogen.
Background technology
At present independently the stage is arranged in (on the space) in the different reactor drums respectively or utilizes intermittently aerobic and the removing of anaerobic condition (on the time) realization nitrogen the traditional biological denitrification process as two nitrification and denitrification; Therefore also often cause denitrification system complicated; Energy consumption is bigger, and operational management inconvenience.Yet; People usually found to have total nitrogen loss in the aerobic nitrification pond of many actual motions in recent years; This is wherein except the part nitrogen asimilation is microorganism cells; Also having possibly be that (Simultaneous nitrification and denitrification, SND) effect is removed through synchronous nitration and denitrification greatly.
The patent No. is that 200620158454.2 patent of invention discloses a kind of A
2/ O oxidation trench technology synchronous nitration denitrification gear, this device adopt the oxidation ditch different at different position and different are carried out aeration, thereby device is separated into several aerobic zones and anaerobic zone, make nitrifier and denitrifying bacteria respectively in aerobic zone and anaerobic zone effect.But nitrifier needs the environment of high-solubility oxygen, low COD; And denitrifying bacteria needs is the environment of LDO, high COD, and this device can't guarantee organic concentration, and; The nitrate salt that nitrobacteria produces is inhibited to denitrifying bacterium; Therefore, this device not only has higher energy consumption, and denitrification effect is not clearly.
Application number is that the patent of invention of 200810010377.X discloses a kind of membrane bioreactor of realizing synchronous nitration denitrification denitrogenation function, comprises reactor assembly, membrane module and on-line monitoring elements such as dissolved oxygen electrode, pH electrode.Though this device can carry out synchronously the nitration denitrification reaction according to the difference of the surfaces externally and internally DO of mikrobe flco, the anti-nitration reaction of this reaction is reaction substrate with the organism, so still uncontrollable denitrification intensity.
Summary of the invention
The invention provides a kind of electrochemical biological combined denitrification reactor, adopt three-diemsnional electrode not only to impel microorganism colonization, improve current utilization rate, and under electric field action, improve nitric efficiency.
A kind of electrochemical biological combined denitrification reactor comprises pond body, battery lead plate, granule electrode, aerating apparatus and current stabilization X-former.Body two ends, pond are respectively equipped with water-in and water outlet; The set battery lead plate of reactor drum comprises anode and negative electrode, and anode is located at the pool center part, and material therefor can be the inert metal material that oxygen evolution potential is lower than 0.2v, like titanium plate, titanium base plating plumbic oxide, titanium base plating ruthenium dioxide plate etc.; Cathode loop is arranged near the pool wall place around anode, and material therefor is a noble electrode, like graphite, stainless steel etc.; Anode and negative electrode are connected on the positive pole and the negative pole of current stabilization X-former respectively; The volts DS of described current stabilization X-former is adjustable between 4～12V; The galvanic current intensity control is at 5～40mA; Through generation speed to the adjusting of electric current and then regulation and control atom state hydrogen; Thereby realize the reaction kinetics balance of nitration reaction and anti-nitration reaction, realize the maximization of synchronous nitration and denitrification effect.Cathode and anode spacing is 5～15 times of anode electrode diameter.Between the yin, yang electrode, filling a large amount of granule electrodes, this granule electrode takes off modification alive by the chitin activated carbon granule, and its surface scribbles FM, and particle diameter is 1～3mm, and the particle proportion rate in reactor drum is 20%～40%.
Described aerating apparatus comprises the micro-hole aerator and the pneumatic pump that links to each other with micro-hole aerator that is located at body bottom, pond.
Electrochemical biological combined denitrification reactor of the present invention replaces conventional Graphite Electrodes with the inert metal electrode; Spherical modified activated carbon particle suspension is at negative and positive two interpolars of main reactor; Form granule electrode, constitute three-diemsnional electrode, have the following advantages: (1) activated carbon grain sub-electrode ability absorb polluted matter; Pollutent can be adsorbed by microbial film fast, and then realize the synchronous nitration and denitrification effect; (2) granule electrode has electric charge at electric microfield effect lower surface, can quicken mikrobe in its surface attachment, can avoid producing the sludge bulking phenomenon; (3) granule electrode moves with the fluidized form under the drive of oxygen supplementing device, so the resistance to mass transfer of contaminant reducing in microbial film, improves the processing efficiency of waste water; (4) the particulate electrode produces atom state hydrogen and oxygen at its surface energy simultaneously under the electric microfield effect, therefore can more effectively carry out the synchronous nitration and denitrification reaction.
The atomic oxygen that produces on granule electrode surface when utilizing electrolysis simultaneously and add the air oxygen supplementing device, internal system form limit oxygen environment (100mv＜ORP＜100mv), thus realize regulation and control to nitrification; Utilize the granule electrode surface to produce atom state hydrogen, alternative organism becomes the electron donor of denitrification, and can be through the adjusting of strength of current being realized the regulation and control of autotrophic denitrification effect.This device will be substituted or the alternative heterotrophic denitrification effect of part by the denitrification of hydrogen autotrophic type; With nitrifying process and separately regulation and control of denitrification process; Realize the autotrophic type synchronous nitration denitrification denitrogenation; Compact construction is simple, floor space is little, current utilization rate is high, microorganism colonization is fast, can remove multiple pollutents such as organism, ammonia nitrogen simultaneously, nitric efficiency is high, energy consumption is low, be convenient to regulation and control, is a kind of multiple three-diemsnional electrode microbial film sewage treatment unit biological, little electrolysis that integrates.
Whole device is looked the voltage of influent quality situation rational allocation current stabilization variograph, makes final outflow water water quality reach " urban wastewater treatment firm pollutant emission standard " one-level B emission standard.
Description of drawings
Fig. 1 is the two dimensional structure synoptic diagram of apparatus of the present invention;
Fig. 2 is the cross-sectional view of apparatus of the present invention.
Embodiment
A kind of electrochemical biological combined denitrification reactor like Fig. 1, shown in 2, comprises pond body 1, electrode, modified activated carbon granule electrode 9, aerating apparatus 8 and current stabilization X-former 7.Body 1 two ends in pond are respectively equipped with water-in 2 and water outlet 4; Electrode comprises anode 5 and negative electrode 3, and anode 5 is located at pond body 1 centre portions, and negative electrode 3, is arranged near the pool wall place around a circle around anode 5, and anode 5 material therefors are the titanium plate, and negative electrode 3 material therefors are graphite; Anode 5 and negative electrode 3 are connected on the positive and negative electrode of current stabilization X-former 7 respectively; Between anode 5 and negative electrode 3, be filled with spherical modified activated carbon granule electrode 9; Aerating apparatus comprises micro-hole aerator 6 that is located at pond body 1 bottom and the pneumatic pump 8 that links to each other with micro-hole aerator 6; The upper end of pond body 1 low order end is provided with water outlet 4.
Treatment sewage is in water-in 2 inflow pond bodies 1; Negative electrode 3 constitutes three-diemsnional electrode with the negative pole that anode 5 connects current stabilization X-former 7 respectively with positive pole; The direct current electric microfield that not only produces promotes mikrobe lateral transfer and the growth and breeding in the sewage; Effectively promote mikrobe to hang film in spherical modified activated carbon granule electrode 9 surface attachment; And make and constitute countless a plurality of electric microfields between each spherical modified activated carbon granule electrode 9 and negative electrode 3, the anode 5; The atomic oxygen and the atom state hydrogen that produce on its surface are that nitrifier, denitrifying bacteria provide competent electron acceptor(EA) and electron donor, through nitration reaction speed and anti-nitration reaction speed are controlled in the regulation and control of dissolved oxygen and strength of current respectively, finally realize the synchronous nitration and denitrification effect.The micro-hole aerator 6 of reactor bottom carries out aeration; Mainly be in order in system, to form limit oxygen environment, to realize regulation and control, improving the nitric efficiency of whole device synchronous nitration and denitrification to nitration reaction speed through regulating dissolved oxygen concentration; After the water outlet that water outlet 4 is discharged gets into second pond precipitates; Reach the purpose that mud-water separation and carrier reflux, the sewage after above-mentioned processing is up to state standards, and enters rivers, lake.
Structure of reactor is with embodiment 1, and anode 5 adopts titanium base plating plumbic oxide material, and negative electrode 3 adopts stainless material.Treatment scheme is with embodiment 1.
Utilize anode to be titanium base plating plumbic oxide material, negative electrode is that directly to handle COD be 45mg/L, NH to the multiple three-diemsnional electrode-biofilm reactor of stainless material
3-N=30mg/L, TN are the simulated wastewater of 40mg/L, at T=28 ℃, and DO=1.2mg/L, HRT=8h, under the I=25mA condition, water outlet COD is 30mg/L, TN=3.2mg/L, NH
3-N=1.9mg/L.
Structure of reactor is with embodiment 1, and anode 5 adopts titanium base plating ruthenium dioxide panel material, and negative electrode 3 adopts graphite material.Treatment scheme is with embodiment 1.
Utilize anode to be titanium base plating ruthenium dioxide material, negative electrode is that directly to handle COD be 45mg/L, NH to the multiple three-diemsnional electrode-biofilm reactor of graphite material
3-N=30mg/L, TN are the simulated wastewater of 40mg/L, under the condition identical with case two: T=28 ℃, DO=1.2mg/L, HRT=8h, I=25mA carries out, and water outlet COD is 26mg/L, TN=1.1mg/L, NH
3-N=0.82mg/L.
Claims (2)
1. an electrochemical biological combined denitrification reactor comprises pond body, battery lead plate, granule electrode, aerating apparatus and current stabilization X-former, it is characterized in that: body two ends, pond are respectively equipped with water-in and water outlet; Said battery lead plate comprises positive plate and negative plate, and positive plate is located at the pool center part, and negative plate is arranged near the pool wall place around anode, and anode and negative electrode are connected on the positive pole and the negative pole of current stabilization X-former respectively; Between the yin, yang electrode, be filled with granule electrode; Aerating apparatus comprises the micro-hole aerator and the pneumatic pump that links to each other with micro-hole aerator that is located at body bottom, pond;
Described granule electrode takes off modification alive by the chitin activated carbon granule, and its surface scribbles FM, and particle diameter is 1～3mm, and the particle proportion rate in reactor drum is 20%-40%;
The volts DS of described current stabilization X-former is adjustable between 4～12V, and the galvanic current intensity control is at 5-40mA;
The redox potential that the aeration rate of aerating apparatus satisfies system in the described reactor drum is in-100mv＜ORP＜100mv scope;
Described anode material is the inert metal material that oxygen evolution potential is lower than 0.2v; Described cathode material is a noble electrode.
2. electrochemical biological combined denitrification reactor according to claim 1 is characterized in that: described anode material is titanium plate, titanium base plating plumbic oxide or titanium base plating ruthenium dioxide plate; Described cathode material is graphite or stainless steel.
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| CN103073155A (en) * | 2013-01-23 | 2013-05-01 | 浙江大学 | Series electrode-biomembrane reactor |
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