CN105217796B - A kind of method and device of downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification - Google Patents
A kind of method and device of downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification Download PDFInfo
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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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
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Abstract
The invention discloses a kind of method and device of downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification, step：A, by system head water distribution uniformity, waste water flows into top non-conducting filler layer first；B, waste water flows into anode conducting packing layer, and unoxidized organic matter removes in this layer；C, then waste water flows into non-conducting filler separation layer, the separator between negative electrode conductive filler layer and anode conducting packing layer；D, waste water flows into negative electrode conductive filler layer, and autotrophic denitrification denitrification process occurs；E, waste water flows out through bottom discharge pipe.Negative electrode conductive filler layer is connected with bottom non-conducting filler layer, non-conducting filler separation layer respectively, anode conducting packing layer is connected with non-conducting filler separation layer, top non-conducting filler layer respectively, and cathode current collector and anode collector are individually positioned in negative electrode conductive filler layer and anode conducting packing layer.It is simple to operate, increase substantially removal efficiency of the downward vertical artificial wetland to this kind of waste water of the high ammonia nitrogen of low-carbon.
Description
Technical field
The invention belongs to sewage treatment area, and in particular to a kind of downward vertical artificial wetland couples microorganism electrolysis cell
The method of strengthened denitrification, also relate to a kind of dress of downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification
Put.
Background technology
At present China water pollution in, nitrogen be gradually increasing for major pollutants, substantial amounts of nitric wastewater it is unprocessed
Or processing is not exclusively just discharged into water body, causes the eutrophication of water body.Therefore, the removal of nitrogen is anxious in current sewage treatment area
One of problem that need to be solved, the research and application of denitrogenation technology cause the extensive concern of people.Actual sewage biological denitrificaion mistake
Cheng Zhong, only when C/N ratios are more than 6, needs of the denitrifying bacterium to carbon source could be met, reach the purpose (Chiu of complete denitrogenation
Y.C.,and Chung M.S.,Determination ofoptimal COD/nitrate ratio for biological
denitrification,International Biodeterioration&Biodegradation,2003,pp.43-
49.).In Practical Project, low C/N is typically that to add methanol or ethanol etc. organic to reach the efficient removal of nitrogen than sewage
Thing, limited resource was so both consumed, has added operation and maintenance cost again.
Artificial wet land system has construction and operating cost low (being only the 1/10-1/2 of traditional B-grade sewage treatment plant), dimension
Shield is simple, high treating effect, it is widely applicable, to load variations it is adaptable the advantages that, therefore be widely used in various
The processing (Wu Zhenbin, composite vertical current artificial wetland, Science Press, Beijing, 2008.) of sewage.Nitrogen goes in artificial swamp
It is the result of wetland plant, matrix and microorganism by the synergy of physics, chemistry and biology except mechanism is more complicated, its
The nitrification and denitrification of middle microorganism is main Approach of Removal of Nitrogen, and sufficient carbon source is the key of denitrifying bacterium efficient denitrification.
For low-carbon high-nitrogen sewage, the carbon source that sewage itself can be provided is insufficient for denitrifying requirement, therefore artificial swamp is total
Universal not high (Jan Vymazal, the Removal of nutrients in various types of of nitrogen removal efficiency
constructed wetlands,Science of the Total Environment,2007,pp.48-65.)。
Microorganism electrolysis cell (Microbial Electrolysis Cell, MEC) is led by the use of microorganism as reaction
Body, between cathode and anode apply potential produce hydrogen a kind of device (Liu H., Grot S., Logan B.E.,
Electrochemically assisted microbial production of hydrogen from acetate,
Environmental Science＆Technology, 2005, pp.4317-4320.), it is recent domestic sewage disposal neck
One of the study hotspot in domain.Because the oxidation-reduction potential for producing hydrogen in MEC on negative electrode is low compared with the reaction of anode oxidation operation, because
This electronics is unable to neous flow.In order to overcome this energy barrier, the reaction of production hydrogen is carried out, need to additionally apply a theoretical value
For 0.13-0.14V voltage.In real reaction, due to loss of potential, additional 0.2-0.9V voltage is typically needed, but
Still less than voltage (1.8-2.0V) required during electrolysis aquatic products hydrogen.That is, although microorganism electrolysis cell needs are additional
Voltage, but the energy consumption needed for still less than chemical electrolysis pond.
Bioelectrochemistry denitrification under studies have shown that low ratio of carbon to ammonium using hydrogen as electron donor can be realized to dirt
Effective removal (Park J Y, Yoo Y J.Biological nitrate removal in of nitrate nitrogen in water
industrial wastewater treatment:which electron donor we can choose,Applied
Microbiology and Biotechnology,2009,pp:415-429.).Its principle is the electrochemistry of MEC cathode surfaces
Active bacteria (general designation without exogenous electron amboceptor with extracellular electron transmission ability microorganism), receives and is carried from dc source
The electronics of confession, combined in negative electrode with proton and produce hydrogen, hydrogen is as NO3 -Electron donor, by NO3 -It is reduced into N2.Anode has
Machine thing is by taking acetate as an example, and specific reaction equation is such as shown in (1)-(3)：
Anode reaction：CH3COO-+2H2O→2CO2+7H++8e- (1)
Cathode reaction：2H++2e-→H2 (2)
2NO3 -+5H2→N2+4H2O+2OH- (3)
However, the constructions cost individually needed for microorganism electrolysis cell is big, operating cost is very high, it is difficult to Chinese extensive
Popularization and application.
MEC there is no report both at home and abroad applied to the de- nitrogen studies of artificial swamp at present.
The content of the invention
The purpose of the present invention is to be the provision of a kind of downward vertical artificial wetland coupling microorganism electrolysis cell reinforcing to take off
The method of nitrogen, method is simple and easy, simple to operate, and downward vertical artificial wetland is to low under the conditions of being remarkably improved carbon source shortage
The denitrification effect of carbon high ammonia-nitrogen wastewater.
Another object of the present invention is to be the provision of a kind of downward vertical artificial wetland coupling microorganism electrolysis cell
The device of strengthened denitrification, it is simple in construction, it is easy to use, it is remarkably improved downward vertical artificial wetland pair under the conditions of carbon source lacks
The denitrification effect of low-carbon high ammonia-nitrogen wastewater.
In order to realize above-mentioned purpose, the present invention uses following technical measures：
In view of the above-mentioned problems, microorganism electrolysis cell (MEC) is combined processing low-carbon and nitrogen with downward vertical artificial wetland
Than sewage, during sewage water denitrification, in addition to the denitrification process of wet land system in itself, moreover it is possible to realize the anti-nitre of electrochemical autotrophic
Change denitrification process, improve total nitrogen removal effect, can solve artificial wetland treatment low carbon-nitrogen ratio sewage process to a certain extent
The problem of carbon source deficiency of middle appearance causes total nitrogen removal effect low.Meanwhile MEC is directly wet with existing downward vertical turning flow artificial
Ground is combined, and greatlys save MEC construction and operating cost.
Technical scheme is：Based on descending vertical current constructed wetland structure, by filling negative electrode conductive filler layer, anode
Conductive filler layer, and the introducing of dc source, form the structural approach that microorganism electrolysis cell and artificial swamp are coupled, the party
Method artificially provides electronics by dc source to negative electrode, makes cathode zone that production hydrogen reaction occur, the hydrogen of generation is as nitric acid
The electron donor of salt nitrogen, hydrogen autotrophic type denitrification denitrogenation process is added, enhances the denitrification denitrogenation in the case of carbon source deficiency
Effect, so as to improve removal of the downward vertical artificial wetland to low-carbon high ammonia-nitrogen wastewater.
A kind of method of downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification, its step are as follows：
A, by system head water distribution uniformity, waste water flows into top non-conducting filler layer first, and the region is due to wetland plant
Radial Oxygen Loss from Root effect and water inlet in the dissolved oxygen brought into make it that the region is presented aerobic state, most ammonia-nitrogen in nitrifier and
Nitrate nitrogen is converted into the presence of nitrococcus, simultaneously because the absorption of filler and microorganism, retention, oxidation, big absolutely
Partial organic substances can also effectively be degraded；
B, and then waste water flows into anode conducting packing layer, and unoxidized organic matter can remove completely substantially in this layer,
Part nitrate nitrogen is reduced into nitrogen by heterotrophic denitrifying Bacteria by the use of organic carbon source as electron donor；
C, then waste water flows into non-conducting filler separation layer, the function of this layer primarily as negative electrode conductive filler layer and
Separator between anode conducting packing layer；
D, subsequent waste water flows into negative electrode conductive filler layer, and the cathode current collector placed in negative electrode conductive filler layer, which receives, to be come from
The electronics of DC power cathode transmission, and the conductive filler that will be transmitted electronically in negative electrode conductive filler layer, are enriched in conduction and fill out
By H after electro-chemical activity bacterium reception electronics on material+Be reduced into hydrogen, hydrogen autotrophic type denitrifying bacterium caused by hydrogen as
Electron donor, nitrate nitrogen is reduced into nitrogen；
E, final waste water flows out through the drainpipe in the non-conducting filler layer of bottom, and total nitrogen content substantially reduces in water outlet, compared with
Conventional downward vertical artificial wetland improves 15%-25% to the nitrogen removal rate of low-carbon high ammonia-nitrogen wastewater (C/N ＜ 3)；.
Described electro-chemical activity bacterium is the quasi-microorganism with extracellular electron transmission, including Proteobacteria
(Proteobacteria), Firmicutes (Firmicutes), acidfast bacilli door (Acidobacteria) and actinomyces door
(Actinobacteria) etc.；Described hydrogen autotrophic type denitrifying bacterium is to utilize hydrogen and inorganic carbon source (carbon dioxide, carbonic acid
Salt etc.) quasi-microorganism of anti-nitration reaction, including Proteobacteria (Proteobacteria), yellow bar are carried out under anoxic conditions
Bacterium door (Flavobacteria), sphingolipid bacillus door (Sphingobacteria) etc..
Described system water inlet is the high ammonia nitrogen of low-carbon (C/N ＜ 3) waste water, including polluted surface water and needs advanced treating
Sewage plant secondary effluent etc..
A kind of device of downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification, the device include：Under
It is supreme be equipped with bottom non-conducting filler layer, negative electrode conductive filler layer, non-conducting filler separation layer, anode conducting packing layer, on
Portion's non-conducting filler layer, it is characterised in that：Negative electrode conductive filler layer is isolated with bottom non-conducting filler layer, non-conducting filler respectively
Layer is connected, and anode conducting packing layer is connected with non-conducting filler separation layer, top non-conducting filler layer respectively, and top is non-conductive to be filled out
Wetland plant is planted in the bed of material, the negative pole with dc source, positive pole are connected respectively by wire for cathode current collector, anode collector
Closed-loop path is formed, cathode current collector and anode collector are individually positioned in negative electrode conductive filler layer and anode conducting packing layer
It is interior, be advantageous to collect and transmit electronics, voltage applied by the dc source of external circuit, described negative electrode conductive filler layer receives
The electronics that DC power cathode provides, and by nitrate under the collective effect of electro-chemical activity bacterium and hydrogen autotrophic type denitrifying bacterium
Nitrogen is converted into nitrogen, realizes the efficient denitrification of nitrate nitrogen under the conditions of carbon source lacks.
The device of described artificial swamp coupling microorganism electrolysis cell strengthened denitrification, it is characterised in that：Described anode is led
Filler is granular activated carbon or graphite particle in electric packing layer and negative electrode conductive filler layer；Granular activated carbon particle diameter is 1-5mm, is filled out
It is 0.45-0.55g/cm to fill density3；Graphite particle particle diameter is 1-5mm, packed density 1.8-2g/cm3。
Described anode collector and cathode current collection extremely graphite felt, graphite rod or stainless steel.
The device depth of packing scope of described downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification is
40-110cm。
Described bottom non-conducting filler thickness degree is 3-20cm；Negative electrode conductive filler layer thickness is 5-25cm；It is non-conductive
Filler separation layer thickness is 3-15cm；Anode conducting packing layer thickness is 5-25cm；Top non-conducting filler thickness degree is 10-
25cm。
Filler is sand in described bottom non-conducting filler layer, non-conducting filler separation layer and top non-conducting filler layer
One kind in stone, anthracite, biological ceramic particle or one to three kind；The plant of top non-conducting filler layer plantation is Lythrum salicaria, wild rice stem,
Canna, water sweet thatch, Value of Spartina Anglica, Arundinella hirta (Thunb.) Tanaka, calamus, reed, napier grass, floral leaf Lu Di, one kind in iris or one to ten are a kind of
Middle any combination.
Described dc source is the device that steady current is formed in holding circuit, exportable voltage 0-1.5V, exports electricity
Flow 0-200mA.
The present invention compared with prior art, has the following advantages that and effect：
(1) present invention is filled out on the basis of original downward vertical artificial wetland construction is not changed by simple electrode
Bury (laying negative electrode conductive filler layer and anode conducting packing layer) and apply external voltage so that nitrate nitrogen can be in low-carbon even
Not under conditions of carbonaceous sources, hydrogen autotrophic denitrification denitrogenation occurs using hydrogen caused by negative electrode conductive filler layer as electron donor
Journey, the removal efficiency of nitrate nitrogen is enhanced to a certain extent, so as to improve the total nitrogen removal effect of low carbon-nitrogen ratio sewage.
(2) negative electrode conductive filler layer, anode conducting packing layer are compared with traditional chemical electrolysis pond in the present invention, specific structure
The advantages of low, energy consumption is small is caused, while avoids the problem of chemical electrode need to be changed often.
(3) the more conventional downward vertical artificial wetland of the present invention can improve to the nitrogen removal rate of low-carbon high ammonia-nitrogen wastewater
15%-25%, be particularly suitable for use in contaminated surface water and sewage plant secondary effluent etc. need the waste water of advanced treating.
Brief description of the drawings
Accompanying drawing is the structural representation that a kind of downward vertical artificial wetland couples microorganism electrolysis cell.
Wherein, 1- bottoms non-conducting filler layer；2- negative electrode conductive filler layers；3- non-conducting filler separation layers；4- anodes are led
Electric packing layer；5- tops non-conducting filler layer；6- wetland plants；7- cathode current collectors (common, market is purchased)；8- direct currents
Source；9- wires；10- anode collectors (common, market is purchased).
Embodiment
The specific embodiment of invention is explained and illustrated below in conjunction with accompanying drawing, is not construed as limiting the invention.
Embodiment 1：
A kind of method of downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification, its step are as follows：
A, by system head water distribution uniformity, waste water flows into top non-conducting filler layer 5 first, and the region is due to wetland plant
The dissolved oxygen brought into 6 Radial Oxygen Loss from Root effect and water inlet causes the region that aerobic state is presented, and most ammonia-nitrogen is in nitrifier
With nitrate nitrogen is converted into the presence of nitrococcus, simultaneously because the absorption of filler and microorganism, retention, oxidation, absolutely
Most of organic matter can also effectively be dropped；
B, and then waste water flows into anode conducting packing layer 4, and unoxidized organic matter can remove completely substantially in this layer,
Part nitrate nitrogen is reduced into nitrogen by heterotrophic denitrifying Bacteria by the use of organic carbon source as electron donor；
C, then waste water flows into non-conducting filler separation layer 3, and the function of this layer is primarily as negative electrode conductive filler layer 2
Separator between anode conducting packing layer 4；
D, subsequent waste water flows into negative electrode conductive filler layer 2, and the cathode current collector 7 placed in negative electrode conductive filler layer 2 receives
Electronics from the transmission of the negative pole of dc source 8, and the conductive filler that will be transmitted electronically in negative electrode conductive filler layer 2, are enriched in
H+ is reduced into hydrogen, hydrogen caused by the utilization of hydrogen autotrophic type denitrifying bacterium after electro-chemical activity bacterium reception electronics on conductive filler
Nitrate nitrogen is reduced into nitrogen by gas as electron donor；
E, final waste water flows out through the drainpipe in bottom non-conducting filler layer 1, and total nitrogen content substantially reduces in water outlet, compared with
Conventional downward vertical artificial wetland improves 15%-25% to the nitrogen removal rate of low-carbon high ammonia-nitrogen wastewater (C/N ＜ 3).
Described electro-chemical activity bacterium is the quasi-microorganism with extracellular electron transmission, including Proteobacteria
(Proteobacteria), Firmicutes (Firmicutes), acidfast bacilli door (Acidobacteria) and actinomyces door
(Actinobacteria) etc.；Described hydrogen autotrophic type denitrifying bacterium is to utilize hydrogen and inorganic carbon source (carbon dioxide, carbonic acid
Salt etc.) quasi-microorganism of anti-nitration reaction, including Proteobacteria (Proteobacteria), yellow bar are carried out under anoxic conditions
Bacterium door (Flavobacteria), sphingolipid bacillus door (Sphingobacteria) etc..
Embodiment 2：
A kind of device of downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification, the device are spread from bottom to top
Provided with bottom non-conducting filler layer 1, negative electrode conductive filler layer 2, non-conducting filler separation layer 3, anode conducting packing layer 4, top
Non-conducting filler layer 5, it is characterised in that：Negative electrode conductive filler layer 2 respectively with bottom non-conducting filler layer 1, non-conducting filler every
Absciss layer 3 is connected, and anode conducting packing layer 4 is connected with non-conducting filler separation layer 3, top non-conducting filler layer 5 respectively, and top is non-
In conductive filler layer 5 plant wetland plant 6, cathode current collector 7, anode collector 10 by wire 9 respectively with dc source 8
Negative pole, positive pole connection composition closed-loop path, cathode current collector 7 and anode collector 10 are individually positioned in negative electrode conductive filler layer 2
And in anode conducting packing layer 4, be advantageous to collect and transmit electronics, voltage is applied by the dc source 8 of external circuit, it is described
Negative electrode conductive filler layer 2 receives the electronics that the negative pole of dc source 8 provides, and in electro-chemical activity bacterium and hydrogen autotrophic type denitrifying bacterium
Collective effect under nitrate nitrogen is converted into nitrogen, realize the efficient denitrification of nitrate nitrogen under the conditions of carbon source lacks.
The device of described artificial swamp coupling microorganism electrolysis cell strengthened denitrification, it is characterised in that：Described anode is led
Filler is granular activated carbon or graphite particle in electric packing layer 4 and negative electrode conductive filler layer 2；Granular activated carbon particle diameter is 1-5mm,
Packed density is 0.45-0.55g/cm3；Graphite particle particle diameter is 1-5mm, packed density 1.8-2g/cm3。
Described anode collector 10 and cathode current collector 7 are graphite felt, graphite rod or stainless steel.
The device depth of packing scope of described downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification is
40-110cm。
The described thickness of bottom non-conducting filler layer 1 is 3-20cm；The thickness of negative electrode conductive filler layer 2 is 5-25cm；It is non-to lead
The electric thickness of filler separation layer 3 is 3-15cm；The thickness of anode conducting packing layer 4 is 5-25cm；The thickness of top non-conducting filler layer 5 is
10-25cm。
Filler is in described bottom non-conducting filler layer 1, non-conducting filler separation layer 3 and top non-conducting filler layer 5
One kind in sandstone, anthracite, biological ceramic particle or one to three kind；The plants 6 of 5 kinds of top non-conducting filler layer plant are Lythrum salicaria,
One kind or one to ten in wild rice stem, canna, water sweet thatch, Value of Spartina Anglica, Arundinella hirta (Thunb.) Tanaka, calamus, reed, napier grass, floral leaf Lu Di, iris
It is combined in one kind.
Described dc source 8 is the device that steady current is formed in holding circuit, exportable voltage 0-1.5V, exports electricity
Flow 0-200mA.
Described system water inlet is the high ammonia nitrogen of low-carbon (C/N ＜ 3) waste water, including two level aerobe reactor (such as give birth to by film
Thing reactor, aerobic activated sludge process, aerobic fluidized bed etc.) sewage and polluted surface water after processing, the type sewage is special
Levy and be：COD=0~60mg/L, NH4 +- N=10~50mg/L.
Test result indicates that：Using the more conventional downward vertical artificial wetland of the device in the present invention to nitrogen removal rate
15%-25% can be improved.
Claims (7)
- A kind of 1. method of downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification, it is characterised in that its step It is：A, by system head water distribution uniformity, waste water flows into top non-conducting filler layer successively（5）, the region wetland plant（6）'s The dissolved oxygen brought into Radial Oxygen Loss from Root and water inlet causes the region that aerobic state is presented, and ammonia nitrogen is in nitrifier and the work of nitrococcus Nitrate nitrogen is converted under, while absorption, retention, the oxidation of filler and microorganism, organic matter are degraded；B, and then waste water flows into anode conducting packing layer（4）, unoxidized organic matter is in the removal of this layer, heterotrophic denitrifying Bacteria profit Part nitrate nitrogen is reduced into nitrogen by the use of organic carbon source as electron donor；C, then waste water flows into non-conducting filler separation layer（3）, this layer is negative electrode conductive filler layer（2）With anode conducting filler Layer（4）Between separator；D, subsequent waste water flows into negative electrode conductive filler layer（2）, negative electrode conductive filler layer（2）The cathode current collector of interior placement（7）Connect Receipts come from dc source（8）The electronics of negative pole transmission, will be transmitted electronically to negative electrode conductive filler layer（2）Interior conductive filler, it is rich By H after electro-chemical activity bacterium reception electronics of the collection on conductive filler+Hydrogen is reduced into, hydrogen autotrophic type denitrifying bacterium utilizes generation Hydrogen be electron donor, nitrate nitrogen is reduced into nitrogen；E, final waste water is through bottom non-conducting filler layer（1）Interior drainpipe outflow, total nitrogen content reduces in water outlet, more conventional Downward vertical artificial wetland improves 15%-25% to the nitrogen removal rate of low-carbon high ammonia-nitrogen wastewater.
- 2. a kind of device of downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification, is used as weighed in the device Profit requires the method processing sewage described in 1, and the device is equipped with bottom non-conducting filler layer from bottom to top（1）, negative electrode conduction fills out The bed of material（2）, non-conducting filler separation layer（3）, anode conducting packing layer（4）, top non-conducting filler layer（5）, it is characterised in that： Negative electrode conductive filler layer（2）Respectively with bottom non-conducting filler layer（1）, non-conducting filler separation layer（3）It is connected, anode conducting is filled out The bed of material（4）Respectively with non-conducting filler separation layer（3）, top non-conducting filler layer（5）It is connected, top non-conducting filler layer（5） Middle plantation wetland plant（6）, cathode current collector（7）, anode collector（10）Pass through wire（9）Respectively with dc source（8）'s Negative pole, positive pole connection composition closed-loop path, cathode current collector（7）And anode collector（10）It is individually positioned in negative electrode conductive filler Layer（2）And anode conducting packing layer（4）It is interior.
- A kind of 3. dress of downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification according to claim 2 Put, it is characterised in that：Described bottom non-conducting filler layer（1）, non-conducting filler separation layer（3）And top non-conducting filler layer （5）Interior filler is sandstone, anthracite, one kind in biological ceramic particle or one to three kind；Top non-conducting filler layer（5）The plant of plantation Thing（6）For in Lythrum salicaria, wild rice stem, canna, water sweet thatch, Value of Spartina Anglica, Arundinella hirta (Thunb.) Tanaka, calamus, reed, napier grass, floral leaf Lu Di, iris One kind or one to ten one kind in be combined.
- A kind of 4. dress of downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification according to claim 2 Put, it is characterised in that：Described anode conducting packing layer（4）With negative electrode conductive filler layer（2）Interior filler be granular activated carbon or Graphite particle；Granular activated carbon particle diameter is 1-5mm, packed density 0.45-0.55g/cm3；Graphite particle particle diameter is 1-5mm, Packed density is 1.8-2g/cm3。
- A kind of 5. dress of downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification according to claim 2 Put, it is characterised in that：Described anode collector（10）And cathode current collector（7）For graphite felt, graphite rod or stainless steel.
- A kind of 6. dress of downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification according to claim 2 Put, it is characterised in that：The device depth of packing of described downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification Scope is 40-110cm.
- A kind of 7. dress of downward vertical artificial wetland coupling microorganism electrolysis cell strengthened denitrification according to claim 2 Put, it is characterised in that：Described bottom non-conducting filler layer（1）Thickness is 3-20cm；Negative electrode conductive filler layer（2）Thickness is 5- 25cm；Non-conducting filler separation layer（3）Thickness is 3-15cm；Anode conducting packing layer（4）Thickness is 5-25cm；Top is non-conductive Packing layer（5）Thickness is 10-25cm.
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| CN114368841A (en) * | 2022-01-19 | 2022-04-19 | 宁波碧城生态科技有限公司 | Quick-start MEC-type downward vertical-flow constructed wetland decarbonization and denitrification device and method for microbial electrolysis cell |
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