CN102259978A - Reactor and method for removing nitrate from water - Google Patents
Reactor and method for removing nitrate from water Download PDFInfo
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- CN102259978A CN102259978A CN2010101949082A CN201010194908A CN102259978A CN 102259978 A CN102259978 A CN 102259978A CN 2010101949082 A CN2010101949082 A CN 2010101949082A CN 201010194908 A CN201010194908 A CN 201010194908A CN 102259978 A CN102259978 A CN 102259978A
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Abstract
The invention discloses a reactor and a method for removing nitrate from water, wherein autotrophic denitrification and heterotrophic denitrification are synergistically carried out in the reactor. The reactor comprises a biological membrane component, a reaction tank, an anode, a cathode and a power supply, wherein the biological membrane component comprises a carrier and a water collector; multiple filter holes are formed on the water collector; the carrier is filled in the filter holes; a water outlet is formed on the upper part of the water collector; the biological membrane component is placed in the reaction tank and the reaction tank is provided with a water inlet; the anode is located in the reaction tank and around the carrier; the cathode is located in the reaction tank and embedded inside the carrier; and the power supply is used for supplying electric power for the anode and cathode. According to the reactor and method disclosed by the invention, autotrophic denitrification and heterotrophic denitrification are synergistically carried out in the reactor and carbon dioxide generated by heterotrophic denitrification is used as an inorganic carbon source for autotrophic denitrification, thereby effectively utilizing the carbon source and improving the utilization rate of energy.
Description
Technical field
The present invention relates to the Application Areas of water technology, relate in particular to a kind of electrochemistry and combine with biologic treating technique and remove the method and the reactor of nitrate in the tap water.
Background technology
Underground water is hydrology round-robin important component part, also is human a kind of important water resources.For suburb and Rural areas water, underground water is one of important drinking water source always.In recent years, ooze under the leaching owing to the below standard discharging of the using in a large number of nitrogenous fertilizer, sanitary sewage and nitrogenous effluent, solid waste and sewage unreasonable reason such as recharged and cause nitrate in groundwater concentration to raise.The water of drinking azotate pollution can cause serious harm to HUMAN HEALTH, nitrate can be deleterious nitrite by micro-reduction in human body, nitrite can be converted into ferric iron with the ferrous iron in the oxyphorase, make the red blood corpuscle sex change, oxyphorase no longer has oxygen carrying capacity, causes human body the phenomenon of suffocating to occur.Acidity is lower than the grownup in baby's stomach, helps the growth of nitrate reduction bacterium, so the baby is more more responsive than the grownup to the genotoxic potential of nitrate, makes the baby easily suffer from methemoglobinemia, is commonly called as blue baby's disease.The water of the high nitrate content of human body long-term drinking also can cause intelligence to descend, and the trained reflex of the sense of hearing and vision is blunt etc.The World Health Organization's current standards was formulated in 1984, and its directive standard to nitrate nitrogen content in the tap water is 10mg/L, and proposed standard is 5mg/L.The standard of the U.S. is 10mg/L, and new " drinking water sanitary standard " that China came into effect from July, 2007 stipulates that also nitrate nitrogen must not surpass 10mg/L in the tap water.
At present, the purification techniques to the tap water that is subjected to azotate pollution mainly contains physics, chemistry and biologic treating technique three major types.Physical method produces contains waste liquids such as high concentration nitrate, vitriol, needs secondary treatment.Method of chemical treatment causes secondary pollution, the subsequent disposal difficulty owing to reaction product such as can producing metal ion, metal oxide or hydrated metal oxide.Biologic treating technique is the denitrification that utilizes microorganism, and the nitrate in the water finally is converted into N
2Denitrifying microorganism comprises two kinds of autotrophic bacteria and heterotrophic bacteriums.At present, the application of heterotrophic bacterium biological denitrification technology is comparatively extensive, because it has advantages such as processing efficiency height, conversion unit are simple, but if the organic carbon source that adds is excessive, remains in the water outlet and can cause secondary pollution.Simultaneously, when the fluctuation of water inlet nitrate content is big, be difficult to the dosage of control carbon source, and have the handling problem of excess sludge.Autotrophic denitrification is to be the electron donor of autotrophic bacteria with the reduced form inorganics, and carbonic acid gas is an energy substance, is the process of nitrogen with nitrate reduction.Two kinds of autotrophic denitrification technologies commonly used are sulphur autotrophy and hydrogen autotrophy.For sulphur autotrophic denitrification method, the dosage of sulphur needs strict control, otherwise excessive sulphur need carry out subsequent disposal; And the vitriol that generates also can cause the secondary pollution of tap water.By contrast, hydrogen is with the obvious advantage as the denitrification process of electron donor, and hydrogen itself is that cleaning is harmless, does not have the excessive problem that pollutes that adds.The hydrogen bacterium that participates in reaction is the fastest class of growth in the chemoautotrophic bacteria, and life cycle is 24 times of thiobacterium.But the solubleness of hydrogen in water is lower, and it is low to cause its utilization ratio, and hydrogen explodes easily simultaneously, is difficult for transportation and storage.
The electrode biomembrane technology is biology and the electrochemistry bonded treatment technology that is at hydrogen that development comes on the autotrophic denitrification basis of electron donor, it has overcome gas loss that outside direct hydrogen supply causes and weakness such as not easy to operate, the biochemical reaction process of complexity is controlled with simple current setting, easy to operate.In patent CN1349934, use fixed bed heterotrophic denitrification device and the series connection of electrochemical autotrophic denitrification device remove the nitrate nitrogen in the tap water, and wherein heterotrophism section and autotrophy section are isolating, and the carbon-nitrogen ratio that the heterotrophism section is used is higher, reaches 2.7-2.9; In patent CN1303819A, be medium with the hard coal, carbon fiber is an electrode, has constructed the filling electrolysis Benitration reactor that declines, and this reactor apparatus is simple, and treatment effect is good, but the nitrate load is low, and treatment capacity is little; In patent CN201347377, as carrier, under pure heterotrophic denitrification condition, carry out complete denitrification, but the carbon source dosage is relatively large with soft fiber, cost is higher; In patent CN101624249, adopt film electrolysis, electrochemical reduction, hydrogen autotrophic denitrification and membrane sepn process to remove nitrate nitrogen, though hydraulic detention time is short, removal effect is good, the reactor design complexity.
In sum, in the prior art, the carbon-nitrogen ratio that heterotrophic denitrification uses is higher.In the electrode biomembrane method, the negative electrode of autotrophic denitrification both provided hydrogen source, double as bio-carrier again, also need add inorganic carbon source simultaneously, and problems such as the culturing process that has autotrophic bacteria is slow, HRT is long, mass transfer effect hydrogen is undesirable, reactor is complicated, microbial film comes off have easily influenced the practical application of electrode biomembrane method.
Summary of the invention
Technical problem to be solved by this invention is to propose a kind of reactor and method of removing nitrate in the water, overcomes the defective that autotrophic denitrification in the prior art need add inorganic carbon source.
For achieving the above object, the present invention proposes a kind of reactor of removing nitrate in the water, autotrophic denitrification and heterotrophic denitrification be collaborative carrying out in described reactor, described reactor comprises: biological membrane assembly, described biological membrane assembly comprises carrier and water collector, have a plurality of filtration apertures on the described water collector, described carrier is filled in the described filtration aperture, and described water collector top has a water outlet; Reactive tank, described biological membrane assembly places described reactive tank, and described reactive tank has a water-in; Anode is arranged in the described reactive tank, and places around the described carrier; Negative electrode is arranged in the described reactive tank, and is embedded in the described carrier; And power supply, be described anode and the power supply of described negative electrode.
Wherein, described water-in connects a suction culvert, and described suction culvert is provided with a peristaltic pump, and described suction culvert inserts in the inlet flume.
Wherein, described water outlet connects an outlet pipeline, and described peristaltic pump is arranged on the described outlet pipeline.
Wherein, the top of described reactive tank and bottom are respectively arranged with the water cycle mouth, and described water cycle mouth connects by an outer loop pipeline, is connected with recycle pump on the described outer loop pipeline.
Wherein, described reactive tank top is provided with overflow port, is connected with overflow passage on the described overflow port.
Wherein, described carrier is selected cotton thread, synthon, mineral substance, sponge or porous ceramics for use.
Wherein said carrier be shaped as wire, thread, vesicular or particulate state.
Wherein, described anodic material is selected from carbon-point, graphite, gac, carbon fiber or solid-phase carbon source.
Wherein, described anode is a plurality of, and described a plurality of anodes are distributed in around the described carrier equably, and described a plurality of anode is connected by lead.
Wherein, the material of described negative electrode is selected from stainless steel, iron, aluminium, copper or nickel.
Wherein, described negative electrode and described anodic are shaped as sheet, thread, tabular, column or netted.
And, for achieving the above object, the present invention also proposes a kind of method of removing nitrate in the water, and wherein, autotrophic denitrification and heterotrophic denitrification be collaborative carrying out in reactor, water inlet is entered in the reactive tank by water-in, enter in the water collector by the filtration aperture that is filled with carrier on the water collector, and by water outlet output, wherein, heterotrophic denitrification utilizes carbon source and/or the additional carbon in the water, and nitrate radical is degraded to nitrogen as electron acceptor(EA); Autotrophic denitrification utilizes carbonic acid gas that carbonic acid gas that heterotrophic denitrification produces and anode carbon oxidation produce as carbon source, the H of catholyte water generates
2As electron donor, nitrate radical is degraded to nitrogen as electron acceptor(EA).
Wherein, it is negative electrode that autotrophic denitrification adopts stainless steel, iron, aluminium, copper or nickel, and adopting carbon-point, graphite, gac, carbon fiber or solid-phase carbon source is that anode carries out.
Wherein, described additional carbon is methyl alcohol, ethanol, formic acid or acetate.
Wherein, in the heterotrophic denitrification method of nitrate, additional carbon is methyl alcohol and/or acetate, and its reaction is:
5CH
3OH+6NO
3 -→3N
2+7H
2O+5CO
2+6OH
-
7.03CH
3COOH+8.58NO
3 -→0.58C
5H
7O
2N+11.16CO
2+8.58OH
-+7.74H
2O+4N
2
The reaction of nitrate autotrophic denitrification is:
Net reaction: 2.16NO
3 -+ 7.24H
2+ 0.8CO
2→ 0.16C
5H
7O
2N+N
2+ 5.6H
2O+2.16OH
-
Anode: C+2H
2O → CO
2+ 4H
++ 4e
Negative electrode: 2H
2O+2e → H
2+ 2OH
-
Wherein, described carrier is selected cotton thread, synthon, mineral substance, sponge or porous ceramics for use.
Wherein, the carbon-nitrogen ratio of water inlet is between 0.5-3.
Wherein, the outer loop pipeline of the top by connecting described reactive tank and the water cycle mouth of bottom makes that the water in the described reactive tank circulates.
Wherein, the overflow passage of the overflow port by connecting described reactive tank top, the water that is higher than predetermined water level in the described reactive tank carries out overflow.
Effect of the present invention:
The reactor and the method for nitrate in the removal water of the present invention, autotrophic denitrification and heterotrophic denitrification be collaborative carrying out in reactor, the carbonic acid gas that is produced by heterotrophic denitrification and the carbonic acid gas of electrochemistry anode carbon oxidation generation are jointly as the inorganic carbon source of autotrophic denitrification, effectively utilize carbon source, improved energy utilization rate.And this reactor enhanced biological carrier and electrode are integrated.Simultaneously, its bio-carrier wide material sources, with low cost, microorganic adhesion performance height and have both the strainer effect; Its cathode material excellent property, durable in use, hydrogen output is high; But the inorganic carbon source of its anode material simple, cheap effective supply of processing.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is a biological membrane assembly synoptic diagram of the present invention;
Fig. 2 is the structural representation of biological membrane assembly reactor of the present invention;
Fig. 3 is the A-A ' diagrammatic cross-section of Fig. 2;
Fig. 4 is the pipeline synoptic diagram of biological membrane assembly reactor of the present invention.
Wherein, Reference numeral:
1-rising pipe 2-bio-carrier
3-filters aperture 4-water collector
5-reactive tank 6-water-in
7-overflow port 8-pickup groove
9-anode 10,11-water cycle mouth
12-negative electrode 13-power supply
14-recycle pump 15-peristaltic pump
16-flooding tube 17-lead
Embodiment
The present invention proposes a kind of reactor and removal method of removing nitrate in the water, applicable to any water sources that contains nitrate such as tap water, sewage.
Fig. 1 is a biological membrane assembly synoptic diagram of the present invention, as shown in Figure 1, this high-efficient electrode biological membrane assembly comprises water collector 4 and carrier 2, have a plurality of filtration apertures 3 on the described water collector 4, described carrier 2 is filled in the described filtration aperture 3, and crams tightness and can flow in the water collector smoothly by capillary action with water and be advisable.Described water collector 4 tops have a water outlet, and described water outlet connects a rising pipe 1.Wherein, the carrier 2 preferable flexible carriers such as cotton thread, synthon, mineral substance, sponge or porous ceramics of selecting for use can be wire, thread, vesicular or particulate state, the preferred thick cotton thread of 1.5mm, and above-mentioned carrier has preferable biological adhesiveness.Water collector 4 is preferably the cylinder of synthetic glass or stainless material, and wall thickness is preferably 2mm-5mm, and it is neglected the treating water amount greatly and decides, when size is big, can be on barrel bonding or welding stiffening web, to improve the intensity of cylindrical shell.Described water collector 4 sealed at both ends, the perforate of top seal lid forms described water outlet, inserts described rising pipe 1 on the described water outlet, to extract the treating water in the described water collector 4.And, on the wall of water collector 4, stamp a plurality of described filtration apertures 3 equably, the diameter that filters aperture 3 is preferably 2mm-10mm, is more preferred from 5mm, filters aperture 3 center squares and is preferably 10-20mm.
Fig. 2 is the structural representation of biological membrane assembly reactor of the present invention, and Fig. 3 is the A-A ' diagrammatic cross-section of Fig. 2, and Fig. 4 is the pipeline synoptic diagram of biological membrane assembly reactor of the present invention.As Fig. 2, Fig. 3 and shown in Figure 4, this reactor comprises above-mentioned biological membrane assembly, reactive tank 5, anode 9, negative electrode 12 and power supply 13.Described reactive tank 5 has a water-in 6, and described biological membrane assembly places described reactive tank 5; Described anode 9 is arranged in the described reactive tank 5, and places around the described carrier 2; Described negative electrode 12 is arranged in the described reactive tank 5, is embedded in described carrier 2 inside; Described power supply 13 is described anode 9 and 12 power supplies of described negative electrode.
Wherein, reactive tank 5 can be circular or square, and the volume of biological membrane assembly accounts for 1/5 of reactive tank 5 effective volumes and is advisable.Preferably, described anode 9 rounded being evenly arranged in around the flexible carrier 2 keep certain distance with described negative electrode 12.D.C. regulated power supply is negative electrode 12 and anode 9 power supplies.
Wherein, preferable carbon-point, graphite, gac, carbon fiber or the solid-phase carbon source of being selected from of described anodic material.Preferably, described anode 9 is made as a plurality of (as a plurality of carbon-points), and described a plurality of anodes are distributed in around the described carrier 2 equably, and described a plurality of anode is by lead 17 (as Stainless Steel Wire) series connection.Preferable stainless steel, iron, aluminium, copper or the nickel of being selected from of the material of described negative electrode.Wherein, the preferred Stainless Steel Wire of cathode material, the preferred diameter of anode material are the cylindric carbon-point of 8-10mm.Described negative electrode and described anodic shape are preferably sheet, thread, tabular, column or netted.
Further, as shown in Figure 3, described water-in 6 connects a suction culvert, and described suction culvert is provided with a peristaltic pump 15, and described suction culvert inserts in the inlet flume 16.Described water outlet connects a rising pipe 1, and described peristaltic pump 15 can be arranged on the described rising pipe simultaneously.The top of described reactive tank 5 and bottom are respectively arranged with water cycle mouth 10,11, and described water cycle mouth 10,11 connects by an outer loop pipeline, is connected with recycle pump 14 on the described outer loop pipeline.And preferably, described reactive tank 5 tops are provided with overflow port 7, are connected with overflow passage on the described overflow port 7.Wherein, water is input in the reactive tank 5 along arrow c by suction culvert, carries out the reaction of heterotrophic denitrification and autotrophic denitrification in reactive tank, removes nitrate wherein, and the water outlet behind the removal nitrate is exported along arrow b by rising pipe 1.Simultaneously, the water in the reactive tank 5 reenters reactive tank 5 along arrow a by circulation port 10 outputs and by circulation port 11 through circulation line.In addition, if the water in the reactive tank 5 has exceeded predetermined water level, then export along arrow d by overflow port 7.
And, utilize above-mentioned reactor, the present invention proposes a kind of method of removing nitrate in the water, this method is heterotrophic denitrification and autotrophic denitrification bonded treatment process, water is entered in the reactive tank 5 by water-in 6, enter in the water collector 4 by the filtration aperture 3 that is filled with bio-carrier 2 on the water collector 4, and export by water outlet, in this process, autotrophic denitrification and heterotrophic denitrification be collaborative carrying out in reactor, wherein, heterotrophic denitrification utilizes carbon source and/or the additional carbon in the water, and nitrate radical is degraded to nitrogen as electron acceptor(EA); Autotrophic denitrification utilizes the carbonic acid gas of heterotrophic denitrification generation as carbon source, the H of catholyte water generates
2As electron donor, nitrate radical is degraded to nitrogen as electron acceptor(EA).
Wherein, described additional carbon is preferably methyl alcohol, ethanol, formic acid or acetate.It is negative electrode that autotrophic denitrification adopts stainless steel, iron, aluminium, copper or nickel, and adopting carbon-point, graphite, gac, carbon fiber or solid-phase carbon source is that anode carries out.
Particularly, the reaction of its heterotrophic denitrification and autotrophic denitrification is as follows:
In the heterotrophic denitrification method of nitrate, the organism of preferable interpolation mainly contains methyl alcohol, acetate, and its reaction formula is as follows:
5CH
3OH+6NO
3 -→3N
2+7H
2O+5CO
2+6OH
- (1)
7.03CH
3COOH+8.58NO
3 -→0.58C
5H
7O
2N+11.16CO
2+8.58OH
-+7.74H
2O+4N
2 (2)
As can be seen, organic a big chunk changes into carbonic acid gas, and effectively nitrate is converted into nitrogen from reaction formula (1) and (2).
In nitrate autotrophic denitrification technology, be electron donor with hydrogen, carbonic acid gas is an energy substance, and wherein a carbonic acid gas part derives from the oxidation of electrochemistry anode carbon, and another part is produced by heterotrophic denitrification, and its reaction formula is as follows:
Net reaction: 2.16NO
3 -+ 7.24H
2+ 0.8CO
2→ 0.16C
5H
7O
2N+N
2+ 5.6H
2O+2.16OH
-(3)
Anode: C+2H
2O → CO
2+ 4H
++ 4e (4)
H
2Can provide by the electrolysis of negative electrode water:
Negative electrode: 2H
2O+2e → H
2+ 2OH
-(5)
Wherein, the carbon-nitrogen ratio in the water (C/N) is advisable with 0.5-3.
Electrical current of the present invention is advisable with 10mA-120mA.
Method of the present invention is applicable to treatment of nitric acid salt nitrogen NO
3 --N concentration is the water about 50mg/L.
Wherein, water inlet flows into from the water-in 6 of reactor bottom, behind the bio-carrier reaction zone in the biological membrane assembly, enter water collector 4 inside by capillary action, in this process, nitrate in the water and the organism reaction that is attached on the bio-carrier 2 are degraded to nitrogen.Water outlet is extracted out from water collector is inner by pump, and hydraulic detention time (HRT) is 8-24 hour.
In addition, preferably, the outer loop pipeline of the top that this method can be by connecting described reactive tank 5 and the water cycle mouth 10,11 of bottom, the water in the described reactive tank 5 circulates.And the overflow passage of the overflow port 7 by connecting described reactive tank 5 tops makes the water that is higher than predetermined water level in the described reactive tank 5 carry out overflow.
Therefore, the invention one make autotrophic bacteria and the symbiotic environment of heterotrophic bacterium, the carbonic acid gas that heterotrophic bacterium generates is utilized by autotrophic bacteria, the two synergy has reduced the secondary pollution problem of the cost and the organic carbon source of treatment of nitric acid salt effectively.Simultaneously, the electrolysis by water provides H
2, can avoid H
2The low and problem such as transportation storage etc. of mass-transfer efficiency.
Bio-carrier support tube is a cylinder that synthetic glass is made, the high 200mm of tube, and diameter 80mm, volume are 1.0L.Barrel is stamped the aperture that diameter is 5mm equably, and pitch-row is 18mm along circumferential direction, is 20mm along normal direction, totally 108 apertures.Aperture is filled with cotton thread, and as soft biofilm carrier, plug-in cotton thread is about 100mm to hang up the thick cotton thread of 1mm (80% cotton, 20% acrylic) at the cylinder wall, and total effective volume is 3603cm
3, the cylinder wall is covered by cotton thread fully; Stainless Steel Wire (negative electrode) 5m is fixed on bio-carrier supports on the tube, and the interspersed equably flexible carrier inside that is embedded in, terminal and power cathode joins; The rounded even layout of 8 carbon-points (anode) is distributed in around the flexible carrier, carbon-point diameter 10mm, and every long 250mm, the length that is dipped in the water is 220mm, effectively total surface area is 553cm
2, 8 carbon-points are together in series with Stainless Steel Wire (lead effect), and Stainless Steel Wire links to each other with power anode again.Whole high-performance bio membrane module is placed in the synthetic glass cylinder (useful volume is 15L for high 300mm, diameter 300mm), promptly get high-performance bio membrane reactor of the present invention.
Adopt high-performance bio membrane module of the present invention and high-performance bio membrane reactor, synthetic tap water nitrate concentration 50mg/L, C/N is 3.0, and pH is 7.6, and HRT is 8 hours, and when electric current I was 10mA, water outlet nitrate concentration and nitrite concentration did not all detect.
The method such as the example 1 of nitrate in the preparation of biological membrane assembly and the removal water, water inlet nitrate concentration 50mg/L, C/N is 1.0, and pH is 7.6, and HRT is 8 hours, when electric current I is 10mA, water outlet nitrate concentration 0.02mg/L; Nitrite concentration all meets national drinking water standard less than 0.01mg/L.
Embodiment 3
The method such as the example 1 of nitrate in the preparation of biological membrane assembly and the removal water, the water inlet nitrate concentration keeps 50mg/L, and C/N is 0.5, and pH is 7.1, and HRT is 8 hours, when electric current I was 100mA, water outlet nitrate concentration 0.6mg/L met national drinking water standard.
Embodiment 4
The method such as the example 1 of nitrate in the preparation of biological membrane assembly and the removal water, the tap water nitrate concentration keeps 50mg/L, pH is between 7.1-7.7, HRT is 8 hours, electric current I is 10mA, C/N was respectively 3.0,2.5,2.0,1.5,1.25,1.0 o'clock, and denitrification process reaches maximum to the utilization ratio of organic carbon source when the C/N=2.0; When C/N less than 1 the time, denitrification reaches 100% to the organic carbon source utilization ratio.
Compared with prior art, effect of the present invention:
1. autotrophic denitrification and heterotrophic denitrification collaborative carrying out in reactor, the carbonic acid gas that is produced by heterotrophic denitrification has effectively utilized carbon source as the inorganic carbon source of autotrophic denitrification, has improved energy utilization rate.
The bio-carrier wide material sources, with low cost, the biological attachment capacity is big, but double as goes out water filter;
3. only need add a spot of organic carbon source among the present invention, save processing cost;
4. nitrate efficient height is removed in the reaction among the present invention, can be with the generation of whole removals of nitrate and no coupling product;
5. the reactor making of implementing method of the present invention is simple, easy to operate, the level of automation height;
6. improve the electrode biomembrane method and efficiently removed the practicality of tap water nitrate.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of claim of the present invention.
Claims (15)
1. a reactor of removing nitrate in the water is characterized in that, autotrophic denitrification and heterotrophic denitrification be collaborative carrying out in described reactor, and described reactor comprises:
Biological membrane assembly, described biological membrane assembly comprises carrier and water collector, has a plurality of filtration apertures on the described water collector, and described carrier is filled in the described filtration aperture, and described water collector top has a water outlet;
Reactive tank, described biological membrane assembly places described reactive tank, and described reactive tank has a water-in;
Anode is arranged in the described reactive tank, and places around the described carrier;
Negative electrode is arranged in the described reactive tank, and is embedded in the described carrier; And
Power supply is described anode and the power supply of described negative electrode.
2. reactor according to claim 1 is characterized in that described water-in connects a suction culvert, and described suction culvert is provided with a peristaltic pump, and described suction culvert inserts in the inlet flume.
3. reactor according to claim 2 is characterized in that described water outlet connects an outlet pipeline, and described peristaltic pump is arranged on the described outlet pipeline.
4. reactor according to claim 1 is characterized in that the top of described reactive tank and bottom are respectively arranged with the water cycle mouth, and described water cycle mouth connects by an outer loop pipeline, is connected with recycle pump on the described outer loop pipeline.
5. reactor according to claim 1 is characterized in that, described reactive tank top is provided with overflow port, is connected with overflow passage on the described overflow port.
6. reactor according to claim 1 is characterized in that described carrier is selected cotton thread, synthon, mineral substance, sponge or porous ceramics for use.
7. reactor according to claim 1 is characterized in that, described carrier be shaped as wire, thread, vesicular or particulate state.
8. reactor according to claim 1 is characterized in that, described anodic material is selected from carbon-point, graphite, gac, carbon fiber or solid-phase carbon source.
9. reactor according to claim 8 is characterized in that, described anode is a plurality of, and described a plurality of anodes are distributed in around the described carrier equably, and described a plurality of anode is connected by lead.
10. reactor according to claim 1 is characterized in that the material of described negative electrode is selected from stainless steel, iron, aluminium, copper or nickel.
11. reactor according to claim 1 is characterized in that, described negative electrode and described anodic are shaped as sheet, thread, tabular, column or netted.
12. method of removing nitrate in the water, it is characterized in that, autotrophic denitrification and heterotrophic denitrification be collaborative carrying out in reactor, water inlet is entered in the reactive tank by water-in, enter in the water collector by the filtration aperture that is filled with carrier on the water collector, and by water outlet output, wherein, heterotrophic denitrification utilizes carbon source and/or the additional carbon in the water, and nitrate radical is degraded to nitrogen as electron acceptor(EA); Autotrophic denitrification utilizes carbonic acid gas that carbonic acid gas that heterotrophic denitrification produces and anode carbon oxidation produce as carbon source, the H of catholyte water generates
2As electron donor, nitrate radical is degraded to nitrogen as electron acceptor(EA).
13. method according to claim 12 is characterized in that, it is negative electrode that autotrophic denitrification adopts stainless steel, iron, aluminium, copper or nickel, and adopting carbon-point, graphite, gac, carbon fiber or solid-phase carbon source is that anode carries out.
14. method according to claim 12 is characterized in that, described additional carbon is methyl alcohol, ethanol, formic acid or acetate.
15. method according to claim 12 is characterized in that,
In the heterotrophic denitrification method of nitrate, additional carbon is methyl alcohol and/or acetate, and its reaction is:
5CH
3OH+6NO
3 -→3N
2+7H
2O+5CO
2+60H
-
7.03CH
3COOH+8.58NO
3 -→ 0.58C
5H
7O
2N+11.16CO
2+ 8.580H
-+ 7.74H
2O+4N
2The reaction of nitrate autotrophic denitrification is:
Net reaction: 2.16NO
3 -+ 7.24H
2+ 0.8CO
2→ 0.16C
5H
7O
2N+N
2+ 5.6H
2O+2.160H
-
Anode: C+2H
2O → CO
2+ 4H
++ 4e
Negative electrode: 2H
2O+2e → H
2+ 20H
-
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| CN103183402A (en) * | 2013-04-21 | 2013-07-03 | 北京工业大学 | Reinforced nitrogen and phosphorus removal method suitable for reclaimed water with low carbon nitrogen ratio |
| CN103601335A (en) * | 2013-10-15 | 2014-02-26 | 常州思宇环保材料科技有限公司 | Device for removing nitrate from restaurant wastewater |
| WO2014082347A1 (en) * | 2012-11-27 | 2014-06-05 | 中国科学院沈阳应用生态研究所 | Method for processing drinking water contaminated by nitrates using two-stage modified active sludge and device therefor |
| CN104230102A (en) * | 2014-09-05 | 2014-12-24 | 河海大学 | Novel bio-denitrification enhanced denitrogenation device for sewage advanced treatment |
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| CN104591391A (en) * | 2015-01-27 | 2015-05-06 | 洛阳理工学院 | Reaction device for effectively removing phosphate from sewage without anaerobic phosphate release and treatment method |
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| WO2014082347A1 (en) * | 2012-11-27 | 2014-06-05 | 中国科学院沈阳应用生态研究所 | Method for processing drinking water contaminated by nitrates using two-stage modified active sludge and device therefor |
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| CN105271615A (en) * | 2015-10-29 | 2016-01-27 | 长江大学 | Electrochemical composite membrane bioreactor |
| CN105347625A (en) * | 2015-11-20 | 2016-02-24 | 中国地质大学（北京） | Method for removing nitrate in underground water and reactor |
| CN106082427A (en) * | 2016-07-29 | 2016-11-09 | 天津大学 | A kind of synchronization removes nitrate and chromic Electrode-biofilm membrane reactor |
| CN106986440A (en) * | 2017-03-13 | 2017-07-28 | 西安建筑科技大学 | A kind of Nitrate Removal Methods of Groundwater and denitrification reactor |
| CN109761338A (en) * | 2019-03-05 | 2019-05-17 | 东北大学 | A kind of reinforced electric catalysis biological filler and its application method |
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| CN110563121A (en) * | 2019-09-27 | 2019-12-13 | 天津大学 | Electrode biological membrane purification method and device suitable for rural domestic sewage treatment |
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