CN107892380A - A kind of device and method for eliminating nitrate in groundwater - Google Patents
A kind of device and method for eliminating nitrate in groundwater Download PDFInfo
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- CN107892380A CN107892380A CN201710972570.0A CN201710972570A CN107892380A CN 107892380 A CN107892380 A CN 107892380A CN 201710972570 A CN201710972570 A CN 201710972570A CN 107892380 A CN107892380 A CN 107892380A
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- denitrogenation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/005—Combined electrochemical biological processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
Abstract
The invention discloses a kind of device and method for eliminating nitrate in groundwater, device includes overground installation and underground device, overground installation includes electrochemical reaction cell, anode pool and cathode pool are divided into by exchange membrane in electrochemical reaction cell, microorganism anode is set in anode pool, photocathode is set in cathode pool；Underground device includes anode chamber and the cathode chamber separated by exchange membrane, and metal anode is set in anode chamber, denitrogenation negative electrode is set in cathode chamber；Microorganism anode is connected with denitrogenation negative electrode with wire, and photocathode is connected with metal anode with wire.Denitrogenation negative electrode is subjected to biofilm, organic wastewater is then passed through into overground installation anode pool, hydraulic detention time is 20~24h, and inlet COD concentration is 500~800mg/L.Solve the problems, such as that electronics insufficient supply causes nitrate poor processing effect in groundwater azotate reduction process, has both handled organic wastewater, be effectively improved the efficiency of in-situ treatment groundwater azotate again.
Description
Technical field
The invention belongs to wastewater processing technology and field of biological energy source, and in particular to a kind of dress for eliminating groundwater azotate
Put and method.
Background technology
Underground water is the important component of water resource, have the advantages that it is widely distributed, be easy to utilization, be the mankind weight
One of drinking water source wanted.However, with the continuous development of industrial or agricultural, groundwater azotate pollution have become one it is universal
Phenomenon, and have the trend increasingly aggravated, therefore the research for repairing groundwater azotate pollution turns into the focus studied now.
The harm to human body and little of nitrate in underground water in itself, but water taste can be ruined during too high levels, when serious
Diarrhoea can be caused.The harm key of nitrate be it enter human body after, can in the presence of gastric juice by nitrate transformation Cheng Ya
Nitrate, and nitrite can constitute a threat to health.After nitrous acid enters blood of human body, it can be reacted with hemoglobin
Ferrihemoglobin is formed, so as to influence the transmittability of oxygen in blood, tissue is poisoned because of anoxic, severe one can cause to breathe
Circulatory failure.
Remedy Technology of Contaminated Groundwater has a lot, can be divided into showering and based technique for in-situ remediation by repair mode.It is in situ
Recovery technique refers in the case where not destroying the soil body and underground water natural environmental condition substantially, and contaminated object is not carried or transported
Method that is defeated, being repaired in situ.Based technique for in-situ remediation can not only save processing cost, can also reduce soil surface treatment facility
Use, farthest reduce the exposure of pollutant and disturbance to environment, therefore application more has prospect.The micro- life of its situ
Thing treatment technology is so that its processing cost is low, secondary pollution is few, the interference to site of contamination or destroys the advantage such as minimum and obtains extensively
Using.And it is in the case of not additional organic carbon source to limit biological prosthetic most critical factor, Microbial denitrogenation speed is very slow,
Nitrate removal is less efficient, but adds organic carbon source and have secondary pollution risk again, therefore, exploitation more reasonably groundwater remediation
Technique turns into research emphasis.
The content of the invention
The present invention provides a kind of device and method for eliminating nitrate in groundwater, and the device can be in the feelings of not additional power source
Under condition, the nitrate in underground water is removed, while removes the COD in organic wastewater, removes depollution, energy-saving consumption-reducing.
A kind of device for eliminating nitrate in groundwater, including overground installation and underground device, the overground installation include
Electrochemical reaction cell, the electrochemical reaction cell is interior to be divided into anode pool and cathode pool by exchange membrane, is set in the anode pool
Microorganism anode, the cathode pool is interior to set photocathode；The underground device includes anode chamber and the moon separated by exchange membrane
Pole room, metal anode is set in the anode chamber, denitrogenation negative electrode is set in the cathode chamber；The microorganism anode is cloudy with denitrogenation
Pole is connected with wire, and the photocathode is connected with metal anode with wire.It is organic wastewater in the overground installation anode chamber,
Employ continuum micromeehanics operational mode；Denitrogenation negative electrode is provided with the underground device cathode chamber, denitrogenation negative electrode has stored electrons
Ability；P-type photocathode is provided with overground installation cathode chamber of the present invention, under light conditions, photocathode is stimulated generation
Hole, attract the electronics of the metal anode in underground device, promote the electronics in whole loop to flow, form electric current.
The present invention utilizes the microorganism of microorganism anode surface, the organic wastewater in anode chamber is decomposed, caused electronics
It is delivered to by microorganism on anode, denitrogenation negative electrode is passed to through wire, work of the nitrate in underground water in denitrifying bacteria
It is nitrogen using the electron reduction on denitrogenation negative electrode under.Unnecessary electron storage is in denitrogenation negative electrode.Night or rainy days
During gas, without sunshine, photocathode can not be excited, and the electrical potential difference between negative electrode and anode is relatively low, be produced without electric current.This
When, the nitrate in underground water can be reduced using the electronics that denitrogenation negative electrode stores.Apparatus of the present invention are without additionally powering.
Ground organic wastewater is aoxidized and is combined with groundwater azotate reduction by apparatus of the present invention, solves underground water nitric acid
Electronics insufficient supply causes the problem of nitrate poor processing effect in salt reduction process, has both handled organic wastewater, and effectively
Improve the efficiency of in-situ treatment groundwater azotate.Meanwhile the present invention utilizes sunlight as light source, other not additional energy
Input, energy-saving consumption-reducing.
Preferably, the microorganism anode is individual layer laminated structure, and electricity generation performance is 20~30A/m2, packed density 5
~8m2/m3Reaction tank.
Microorganism anode will can be used, biofilm process to be to sell commodity after the anode biofilm bought back：Sealable double
In the reactor of room, anode is put into anode chamber, and negative electrode is put into cathode chamber, is connected with wire.Anode chamber and cathode chamber proton exchange
Film is separated, and fresh M9 solution is added in anode chamber, and the electricity-producing microorganism and nitrogen for being inoculated with 10% are blown, and 10g/L is added in cathode chamber
Potassium ferricyanide solution and nitrogen blow.Reactor is placed under 30 degrees Celsius of constant temperature and cultivated 3~5 days, biofilm is completed.
Preferably, the overground installation Anodic pond is set in cathode pool, and the pool wall of the cathode pool is the photoelectricity
Negative electrode.Whole overground installation is placed in the place that can be adequately exposed to illumination.
The photocathode be p-type photocathode sheet as prior art, be to be prepared by predecessor of monocrystalline silicon, tool
Preparation step is as follows：
(1) monocrystalline silicon wafer is cleaned with organic solvent and deionized water successively, then in prianha solution (1:3v/v
30%H2O2：The concentrated sulfuric acid) in immersion 10~20 minutes, then 5~8% HF solution soak 2~5 minutes, take out silicon chip simultaneously it is clear
Wash.Cleaned silicon chip is put into AgNO3In solution and HF solution soak 1~3 hour, then successively with 5~8wt%HF with
Clear water cleans.
(2) by the silicon chip cleaned up in four thio ammonium molybdate and sodium hypochlorite mixed solution, using Ag/AgCl as reference
Electrode, platinum filament are to electrode, sweep CV30~50 and enclose.Scanning range is 0.1~-1.0V vs.Ag/AgCl, sweep speed 0.05
~0.1V/s.Then distilled water cleaning electrode is used.
Preferably, the denitrogenation negative electrode is placed in subsurface flow updrift side, and metal anode is placed in subsurface flow downstream direction.
Preferably, the denitrogenation cathode capacitance amount is 1~1.5 × 105C/m3Electrode, it is prepared by predecessor of carbon black,
Specifically prepare by the following method：
(1) sieve, soaked successively through organic solvent, clear water is cleaned, dries, calcined after waste and old rubber manufacturing machinery is crushed
Carbon black；
(2) gained carbon black and starch are well mixed, it is in dough to add organic solvent and stir to mixture；
(3) gained mixture is compacted in rigid porous material substrate, placed to after being completely dried in the porous material of hardness
Punched on material, carry out microorganism colonization, obtain single piece of material；
(4) gained single piece of material hole is staggeredly concatenated and produced.
The through hole in different single piece of material is staggeredly punched in punch out step, conveniently through hole interlaced arrangement during application.
Preferably, the through hole hole area for punching to obtain is 80~120cm2。
It is further preferred that the chip particle diameter after being sieved in step (1) is 50~500nm；The organic solvent is ethanol,
Soak time in organic solvent is 20~30 minutes；Drying temperature is 60~100 DEG C；Calcining is carried out in tube furnace, is calcined
Temperature is 800~1200 DEG C, and calcination time is 2~3 hours, using pure nitrogen gas to protect gas during calcining.
It is further preferred that starch quality is 1~3 times of carbon black mass in step (2), organic solvent is ethanol；In face
Water content is 2~5% in the mixture of bulk.
It is further preferred that the chip particle diameter after being sieved in step (1) is 500nm；The organic solvent is ethanol, organic
Soak time in solvent is 30 minutes；Drying temperature is 60 DEG C；Calcining is carried out in tube furnace, and calcining heat is 1000 DEG C,
Calcination time is 2 hours, using pure nitrogen gas as protection gas during calcining；Starch quality is 2 times of carbon black mass in step (2), is had
Solvent is ethanol.
It is further preferred that rigid porous material substrate described in step (2) is titanium net or stainless (steel) wire, mesh number is 50~
100 mesh, the porosity of whole material is 10~30%；Standing time is 12~24 hours.
It is further preferred that the method for microorganism colonization is as follows described in step (3)：
Material after being completely dried is placed in resealable container, nitrate nutrient solution is added, into nitrate nutrient solution
Autotrophy anaerobic denitrifying bacteria is inoculated with, the oxygen in container is removed and is passed through hydrogen and carbon dioxide mix gas, cultivate at room temperature,
Material surface is set to adhere to one layer of biomembrane.
It is further preferred that the concentration of nitrate is 20~30mg/L in nitrate nutrient solution；Incubation time is 5~10
My god, 20~40% nitrate nutrient solution is taken out in timing daily from container, and adds the fresh nitrate training of comparable sodium
Nutrient solution, while hydrogen make-up.
It is further preferred that the autotrophy anaerobic denitrifying bacteria tames to obtain by the following method：
(1) water sample containing autotrophic type bacterium is gathered from sewage treatment plant；
(2) gained water sample is centrifuged into 5~8min under 9000~13000g rotating speeds, taking precipitate, washed 2~4 times with clear water；
(3) gained sediment in step (2) is placed in resealable container, it is 20~30mg/L's to add nitrate concentration
Nitrate nutrient solution, remove the oxygen in container and be passed through hydrogen and carbon dioxide mix gas；
(4) resealable container to be cultivated in shaking table, setting rotating speed is 120~180rpm, is cultivated 30~50 days at room temperature,
20~40% nitrate nutrient solution is taken out in timing daily from container, and adds the fresh nitrate culture of comparable sodium
Liquid, while hydrogen make-up.
It is further preferred that in the preparation method of denitrogenation negative electrode, adjacent monolithic material parallel is placed, is adjacent in step (4)
Spacing between single piece of material is 1~3 meter.
Preferably, the material of metal anode is inert metal electrode, such as titanium, platinum, and packed density is 3~5m2/m3.That is material
Expect the local ground watering volume of overall surface area/processing.
The present invention also provides a kind of method that nitrate in groundwater is eliminated using described device, comprises the following steps：
Denitrogenation negative electrode is subjected to biofilm, organic wastewater is then passed through into overground installation anode pool, hydraulic detention time is
20~24h, inlet COD concentration are 500~800mg/L.
Preferably, the water intake velocity of overground installation anode pool is 20~30m3/h；More preferably 25m3/h。
The biofilm process of denitrogenation negative electrode is as follows：
(1) denitrogenation negative electrode and metal anode are wrapped up with waterproof cloth, centre is separated with ionic membrane, forms closed sun
Pole room and cathode chamber, in an Ag/AgCl reference electrode built in cathode chamber.
(2) step (1) described device is placed in underground water circulating area, cushioning liquid is injected in anode chamber, in cathode chamber
Denitrifying bacteria bacterium solution and 20mg/L nitrate nutrient solutions are injected, by metal anode and denitrogenation negative electrode external power supply, maintains denitrogenation
Cathode potential makes denitrifying microorganism be attached to denitrogenation cathode surface, completes biofilm in -0.5V, culture a period of time.
(3) after nitrate concentration is degraded to less than nitrate in groundwater concentration, waterproof cloth and Ag/AgCl references are removed
Electrode.
Compared with prior art, the present invention has the advantages that：
(1) ground oxidation operation is innovatively combined by the present invention with groundwater azotate reduction, solves underground
Electronics insufficient supply causes the problem of nitrate poor processing effect during water nitrate reduction, has both handled organic wastewater, again
The efficiency of in-situ treatment groundwater azotate is effectively improved, is killed two birds with one stone.
(2) present invention utilizes photocatalysis p-type optoelectronic pole to produce hole, improves ground reaction unit cathode potential, so as to
The electrical potential difference of whole system is improved, promotes electronics caused by degradation of organic substances to be transferred to denitrogenation electrode, improves underground water nitric acid
The processing speed of salt.
(3) present invention utilizes sunlight as light source, not additional other energy input, energy-saving consumption-reducing.
Brief description of the drawings
Fig. 1 is the structural representation of apparatus of the present invention.
Fig. 2 is laboratory simulation schematic device.
Reference is as follows described in figure：
1- electrochemical reaction cell 2- microorganism anode 3- PEMs
4-P type photocathode 5- ground 6- wires
7- denitrogenation negative electrode 8- metal anode 9- underground water reaction tanks
Embodiment
As shown in figure 1, a kind of device for eliminating nitrate in groundwater, including overground installation and underground device, fill on the ground
Put including electrochemical reaction cell 1, electrochemical reaction cell is interior to be divided into anode pool and cathode pool, cathode pool bag by PEM 3
It is trapped among outside anode pool, microorganism anode 2 is set in anode pool, and microorganism anode is single chip architecture, and packed density is 5~8m2/(m3
Reaction tank), the pool wall of cathode pool is p-type photocathode 4.
Underground device includes anode chamber and the cathode chamber being separated by PEM 3, cathode chamber current located underground
Upstream, cathode chamber set denitrogenation negative electrode 7, and anode chamber is located underground to be swum under water, and metal anode 8 is set in anode chamber.Microorganism sun
Connected between pole 2 and denitrogenation negative electrode 7 by wire 6, p-type photocathode 4 is connected by wire with metal anode.
Laboratory simulation schematic device is illustrated in figure 2, wherein using the mould of underground water reaction tank 9 with intake-outlet
Intend groundwater environment, in cathode chamber and anode chamber water reaction tank located underground, other are the same as Fig. 1 shown devices.
The preparation process of denitrogenation negative electrode is as follows：
(1) autotrophy anaerobic denitrifying bacteria is tamed
In sewage treatment plant in the anaerobic pond with denitrification function, the water containing autotrophic type bacterium is taken using conventional method
Sample.Water sample is centrifuged into 5min under 13000g rotating speeds, taking precipitate, washed three times with clear water.Put the precipitate in anaerobism bottle, add
Enter 30mg/L nitrate nutrient solution, culture formula of liquid is：K2HPO4 3.4g/L、KH2PO4 4.4g/L、NaHCO3 2g/L、
NH4Cl 0.1g/L、NaCl 0.5g/L、MgSO4·7H2O 0.1g/L、NaNO30.03g/L.Remove the oxygen in container and lead to
Enter hydrogen and carbon dioxide mix gas.Anaerobism bottle is placed in shaking table, setting rotating speed is 180rpm, is cultivated 30 days at room temperature.Often
20% nitrate nutrient solution is taken out in its timing from container, adds the fresh nitrate culture of comparable sodium equal volume
Liquid, while hydrogen make-up.
After domestication, autotrophy anaerobic denitrifying bacteria is enriched in anaerobism bottle.
(2) denitrogenation material is made
Waste and used rubber tyre is put into tire pulverizer and crushed, circuit grinding is：Junked tire → ring cutting machine → slitting
Machine → dicer → disintegrating machine → grinder → screening machine → rubber powder.Rubber powder particle diameter obtained above is 500nm.Take
Appropriate rubber powder, it is placed in 500ml beakers, is first washed twice with clear water, then add acetone, soaks 30min, use clear water again
Wash twice, be put into 60 DEG C of baking ovens and dry afterwards.
The rubber powder of drying is placed in tube furnace, under conditions of nitrogen makees protection gas, 1000 DEG C of high-temperature calcinations 2 are small
When, rubber is become carbon black.Tube furnace is closed after 2 hours, after tube furnace fire box temperature is dropped to below 100 DEG C, takes out carbon black,
Dry in the air to room temperature.
2g carbon blacks and 4g starch is taken to be placed in 250ml beakers, being sufficiently stirred makes it well mixed.A small amount of ethanol is added,
Continue to stir, it is in dough to make mixture.Clip 4*8cm2One piece of titanium net, dough is evenly coated in titanium net,
It is compacted with roll squeezer, is air-dried at room temperature, ethanol is volatilized.Punched after drying in titanium net, hole area 100cm2Left and right.
Above-mentioned material is placed in closed container, adds 30mg/L nitrate nutrient solution, and the autotrophy anaerobism tamed
Denitrifying bacteria bacterium solution, cultivate 3 days at room temperature, material surface is attached to one layer of denitrifying bacteria microbial film.
Take 5 material parallel for hanging up properly film houses, per 0.5cm is spaced between sheet material, connected with wire, mutually it
Between hole stagger, as in the analogue experiment installation shown in Fig. 2.
Embodiment 1
Simulated experiment is carried out using device as shown in Figure 2, in the present embodiment, the volume of electrochemical reaction cell 1 is 360ml, its
Middle-jiao yang, function of the spleen and stomach pole room and each 180ml of cathode chamber, the volume of underground water reaction tank 9 are 360ml, the wherein each 180ml in anode chamber and cathode chamber.It is raw
Thing anode is square (4cm × 4cm), and photocathode is rounded (Φ 7cm).Metal anode is square (4cm × 4cm), takes off
Nitrogen negative electrode is square (4cm × 4cm).
In the present embodiment, electrochemical reaction cell 1 is provided with the first water inlet and the first delivery port, and underground water reaction tank 9 is provided with
Second water inlet and the second delivery port.
In the present embodiment, have sanitary sewage as simulation using 1g/L sodium acetate solution, using 20mg/L nitrate solution as
Simulated groundwater, Xenon light shining imitate solar irradiation.
The course of work of device that the present embodiment is a kind of to eliminate groundwater azotate is：
Sodium acetate solution enters anode chamber from the first water inlet, is flowed out from the first delivery port, and nitrate solution enters from second
The mouth of a river enters cathode chamber, is flowed out from the second delivery port.
Sodium acetate is decomposed under the electricity production bacterium effect of biological anode surface, and caused electronics is transported to by electrode and wire
Denitrogenation negative electrode, utilized by the denitrifying bacteria of denitrogenation cathode surface, reduce nitrate, produce nitrogen.Xenon lamp irradiates p-type optoelectronic pole
Hole is produced, raises the potential of photocathode, promotes metal anode electrolysis water to produce hydrogen ion, oxygen and electronics, electronics and leads to
Cross wire and be delivered to optoelectronic pole supplement hole, oxygen escape, hydrogen ion reaches denitrogenation cathode chamber through proton membrane.Meanwhile micro- life
Thing anode produces electronics using organic matter and hydrogen ion, electronics is delivered to denitrogenation negative electrode by wire in the presence of bacterium is produced electricity,
Nitrate changes into nitrogen and water using hydrogen ion caused by electronics and metal anode electrolysis water.And hydrogen caused by microorganism anode
Ion is then combined generation hydrogen with the electronics that illumination inspires through proton membrane into photocathode room.
Embodiment 2
The nitrate in underground water is removed using the device of the elimination groundwater azotate of embodiment 1, is comprised the following steps：
(1) 1g/L sodium acetate solution is injected into the anode chamber of electrochemical reaction cell 1, to the moon of electrochemical reaction cell 1
Injection PBS in pole room, 20mg/L nitrate solution is injected into the cathode chamber of underground water reaction tank 9, to underground water
PBS is injected in the anode chamber of reaction tank 5.And the pH adjusted in all chambers is 7.
(2) wire 6 is connected.In 0-12 hours, xenon source is opened, illumination is provided to p-type optoelectronic pole.In 12-24 hours,
Xenon lamp is closed, shading treatment is done to p-type optoelectronic pole.
(3) nitrate concentration was measured by sampling in the second delivery port at 0,12,24 hour respectively.Testing result is shown in Table 1.
Comparative example 1
It is same as Example 2, but in the device of the elimination groundwater azotate of the present embodiment, the denitrogenation negative electrode of underground device
Change the denitrogenation negative electrode without storage electronic capability into.It is dense that nitrate was measured by sampling in delivery port 2 at 0,12,24 hour respectively
Degree.Testing result is shown in Table 1.
Comparative example 2
It is same as Example 2, but in the device of the elimination groundwater azotate of the present embodiment, anode chamber's note of overground installation
Enter to be not added with the nutrient solution of sodium acetate.Nitrate concentration was measured by sampling in delivery port 2 at 0,12,24 hour respectively.Testing result
It is shown in Table 1.
Comparative example 3
It is same as Example 2, but in the device of the elimination groundwater azotate of the present embodiment, the nitre of underground device will be injected
Acid salt solution concentration is adjusted to 30mg/L.Nitrate concentration was measured by sampling in delivery port 2 at 0,12,24 hour respectively.Detection knot
Fruit is shown in Table 1.
The Inlet and outlet water water quality situation of the embodiment of table 1
The specific implementation case of patent of the present invention is the foregoing is only, but the technical characteristic of patent of the present invention is not limited to
This, any those skilled in the relevant art in the field of the invention, all cover in the special of the present invention by the change or modification made
Among sharp scope.
Claims (10)
1. a kind of device for eliminating nitrate in groundwater, including overground installation and underground device, it is characterised in that the ground
Device includes electrochemical reaction cell, and the electrochemical reaction cell is interior to be divided into anode pool and cathode pool, the anode by exchange membrane
Microorganism anode is set in pond, photocathode is set in the cathode pool；The underground device includes the sun separated by exchange membrane
Pole room and cathode chamber, metal anode is set in the anode chamber, denitrogenation negative electrode is set in the cathode chamber；The microorganism anode
It is connected with denitrogenation negative electrode with wire, the photocathode is connected with metal anode with wire.
2. device according to claim 1, it is characterised in that the microorganism anode is individual layer laminated structure, electricity generation performance
For 20~30A/m2, packed density is 5~8m2/m3Reaction tank.
3. device according to claim 1, it is characterised in that the overground installation Anodic pond is set in cathode pool, institute
The pool wall for stating cathode pool is the photocathode.
4. device according to claim 1, it is characterised in that the denitrogenation negative electrode is placed in subsurface flow updrift side, metal
Anode is placed in subsurface flow downstream direction.
5. device according to claim 1, it is characterised in that the denitrogenation cathode capacitance amount is 1~1.5 × 105C/m3Electricity
Pole, prepare by the following method：
(1) sieve, soaked successively through organic solvent, clear water cleans, dried, calcining and to obtain charcoal after waste and old rubber manufacturing machinery is crushed
It is black；
(2) gained carbon black and starch are well mixed, it is in dough to add organic solvent and stir to mixture；
(3) gained mixture is compacted in rigid porous material substrate, placed to after being completely dried on rigid porous material
Punching, microorganism colonization is carried out, obtains single piece of material；
(4) by gained single piece of material hole it is staggered, concatenate and produce.
6. device according to claim 5, it is characterised in that the chip particle diameter after being sieved in step (1) is 50~500nm；
The organic solvent is ethanol, and the soak time in organic solvent is 20~30 minutes；Drying temperature is 60~100 DEG C；Calcining
Carried out in tube furnace, calcining heat is 800~1200 DEG C, and calcination time is 2~3 hours, using pure nitrogen gas to protect during calcining
Gas.
7. device according to claim 5, it is characterised in that starch quality is 1~3 times of carbon black mass in step (2), is had
Solvent is ethanol；It is 2~5% in water content in doughy mixture.
8. device according to claim 5, it is characterised in that rigid porous material substrate described in step (2) be titanium net or
Stainless (steel) wire, mesh number are 50~100 mesh, and the porosity of whole material is 10~30%；Standing time is 12~24 hours.
9. device according to claim 1, it is characterised in that the material of metal anode is inert metal electrode, packed density
For 3~5m2/m3。
10. a kind of method that nitrate in groundwater is eliminated using claim 1~9 any claim described device, it is special
Sign is, comprises the following steps：
Denitrogenation negative electrode is subjected to biofilm, is then passed through organic wastewater into overground installation anode pool, hydraulic detention time is 20~
24h, inlet COD concentration are 500~800mg/L.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110921812A (en) * | 2019-12-19 | 2020-03-27 | 苏州首创嘉净环保科技股份有限公司 | Photoelectrocatalysis coupling autotrophic denitrification microorganism nitrogen and phosphorus removal process method |
| CN114368825A (en) * | 2022-01-19 | 2022-04-19 | 重庆融极环保工程有限公司 | Sewage treatment device |
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