CN108483619A - Strengthen the method and device of downward vertical artificial wetland denitrification efficiency using sewage electricity production in a kind of original position - Google Patents
Strengthen the method and device of downward vertical artificial wetland denitrification efficiency using sewage electricity production in a kind of original position Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F3/00—Biological treatment of water, waste water, or sewage
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- C02F3/00—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses a kind of original positions to utilize the method and device of sewage electricity production reinforcing downward vertical artificial wetland denitrification efficiency, step：A, sewage at the top of device continuously by entering；B, sewage flows into anode conducting packing layer, and ammonia nitrogen is oxidized to nitrate nitrogen in the case where anode denitrogenation Pseudomonas acts on；C, then sewage flows into non-conducting filler separation layer；D, subsequent sewage flows into cathode conductive filler layer, and nitrate nitrogen is reduced into nitrogen；E, last sewage is flowed out through bottom non-conducting filler layer internal drainage pipe, and total nitrogen removes in water outlet.Cathode 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, wetland plant is planted in non-conducting filler layer top, anode collector, cathode current collector are connected by inside conductor short circuit.Method is simple, simple operation, in situ using the electric energy generated, significantly improves low-carbon high-ammonia-nitrogen sewage total nitrogen removal effect.
Description
Technical field
The invention belongs to sewage treatment field, it is more particularly to a kind of raising microbiological fuel cell and perpendicular flow artificial is wet
Ground coupled system handles low-carbon high-ammonia-nitrogen sewage（Sanitary sewage, the landfill leachate of low concentration, sludge-digestion liquid etc.）When total nitrogen
The operation method for removing efficiency, also relates to a kind of original position and strengthens downward vertical artificial wetland denitrogenation using sewage electricity production to imitate
The device of energy.
Background technology
Low ratio of carbon to ammonium（C/N ≤5）It is the characteristic feature of southern region of China sewage, conventional biochemical treatment process（Such as activity
Sludge, biofilm etc.）Because carbon source deficiency causes nitric efficiency low in denitrification process, effluent quality is difficult to meet increasingly
Stringent discharge standard requirement, the ecological water water quality inferiority required with ecological environment is away from bigger.And add the organic carbons such as methanol, ethyl alcohol
Though biological denitrification process can be improved in source, operating cost can be also increased.
Artificial swamp（CW）As a kind of environmental-friendly and low-cost ecological engineering technology, gradually become sewage
One of the prevailing technology of decentralized processing and deep purifying.The removing of nitrogen mainly passes through biological nitration and denitrification in artificial swamp
Act on two stages；Ammonia nitrogen is oxidized to nitrate nitrogen in nitrification, and nitrate nitrogen is reduced to nitrogen in denitrification
Finally discharge into the atmosphere.In the first phase when oxygen deficiency, nitrification can be suppressed, and reduce the nitrate being converted to
Nitrogen, further total nitrogen removal；In second stage organic carbon source deficiency, denitrification can be suppressed, and influence total nitrogen removal.
Although also there is abundant carbon source supply approach in artificial wet land system（The decomposition of microorganism and dead plants, plant root exudation,
The release of organic matter is deposited in matrix）And Approach of Removal of Nitrogen（The denitrification microorganisms such as the aerobic of symbiosis, anaerobism, autotrophy, heterotrophism, matrix
Absorption, plant absorption etc.）, but for influent COD/N（≤5）Sewage, still suffer from the total nitrogen caused by carbon source deficiency
The limited problem of removal ability（Jan Vymazal, Removal of nutrients in various types of
constructed wetlands, in Science of the Total Environment, 2007,48-65.）.How
Further increase its denitrification efficiency, it has also become the hot and difficult issue of current artificial swamp denitrogenation technical research in the world.
MFC denitrogenations technology also obtains the concern of colleague scholars in recent years.Its principle is：It is organic that bacterium oxidation is produced electricity in anode
The electronics that object generates is transmitted to nitrate and the proton come from anode chamber's transmission in cathode and cathode via external circuit and occurs
Reduction reaction, to which nitrate is reduced into nitrogen.
MFC denitrogenations are affected by the method for operation and operating parameter.If DO is to aerobic and anaerobic organism cathode denitrogenation
Influence it is different, because oxygen reduction potential be higher than nitrate nitrogen, can preferentially become cathode primary electron receptor.Therefore,
To maintain DO in low-level in anaerobic organism cathode MFC denitrogenations（<0.5 mg/L）.And aerobic cathode MFC denitrogenations mainly occur together
Nitration denitrification process is walked, in order to make biomembrane surface layer microorganism that nitrification occur by ammonium oxidation into nitrate nitrogen, DO cannot
It is too low（Virdis B., et al., Simultaneous nitrification, denitrification and
carbon removal in microbial fuel cells. Water Research, 2010,44(9):2970-
2980）.
Ammonia nitrogen can also transmit electronics to electrode directly as electron donor（Jadhav et al., effective
ammonium removal by anaerobic oxidation in microbial fuel cells.
Environmental Technology, 2015,36（6）：767-775）, occur anode ammoxidation process when, electricity production with
The addition of anode ammonia nitrogen and improve, and nitrate nitrogen and nitrite nitrogen increase with the reduction of ammonia nitrogen（He Y, Wang Y,
Song X. High-effective denitrification of low C/N wastewater by combined
constructed wetland and biofilm-electrode reactor. Bioresource Technology,
2016, 203: 245-251.）.
Extrernal resistance can influence the dirt of MFC by influencing anode potential, size of current and electrode biomembrane structure of community
Water warfare performance (Zhang L, et al. Biofilm formation and electricity generation of a
microbial fuel cell started up under different external resistances. Journal
of Power Sources, 2011, 196(15): 6029-6035. ).Low extrernal resistance operation can make between biomembrane and electrode
Faster electron transmission is obtained, removal (Jang J K, the et al. Construction and of pollutant are more advantageous to
operation of a novel mediator-and membrane-less microbial fuel cell. Process
Biochemistry, 2004, 39(8): 1007-1012. ).The height of extrernal resistance directly affects the big of MFC reactor electric currents
It is small, i.e. rate of the electronics from anode to cathode flow, thus cathode denitrification can be had an impact.
Based on above-mentioned theory, when MFC short circuit operations（I.e. external resistance is 0 Ω）When, system can provide maximum electric current,
It can guarantee the electronics transfer of flank speed between electrode and pollutant.When MFC short circuit operations, system is actually reduced to two
Electrode connects, even one block of conductive material.At this point, the electronics that anode bacterium generates their metabolism by respiration
It is transferred in nitrate electron acceptor, it can be achieved that the in situ of electric energy utilizes.
Artificial swamp-microbiological fuel cell coupled system is gradually applied to the processing of sewage in recent years due at low cost.
Although studies have reported that CW-MFC has preferable effect for handling high-nitrogen waste water（Oon et al., Hybrid system
up-flow constructed wetland integrated with microbial fuel cell for
simultaneous wastewater treatment and electricity generation. Bioresource
Technology, 2015, 186: 270-275.）, but be aerated in cathode, increase system operation expense.For
How low-carbon high-ammonia-nitrogen sewage realizes the research that the efficient denitrification of CW-MFC systems is also current under the conditions of without mechanical aeration
One of difficult point.
Invention content
The purpose of the invention is to provide a kind of raising downward vertical artificial wetland-microbiological fuel cells
（DFCW-MFC）System handles low-carbon high-ammonia-nitrogen sewage（Such as landfill leachate of sanitary sewage, low concentration, sludge-digestion liquid）
Total nitrogen removal efficiency operation method, method is simple and practicable, simple operation, in situ using the electric energy generated, is remarkably improved
The total nitrogen removal effect of such sewage.
Another object of the present invention is to be the provision of a kind of raising downward vertical artificial wetland-Microbial fuel electricity
Cell system handles the device of low-carbon high-ammonia-nitrogen sewage total nitrogen removal efficiency, simple in structure, easy to assembly, is remarkably improved organic carbon
The denitrification effect of downward vertical artificial wetland under the conditions of source, oxygen lack.
In order to achieve the above purpose, the present invention uses following technical measures：
Pass through the effective chimeric of microbiological fuel cell and downward vertical artificial wetland so that obtained between biomembrane and electrode
Faster electron transmission, and utilize electric energy in situ, using anode bacterium respiration the electronics transfer of generation to electronics by
In body nitrate, to realize strengthened denitrification effect.
Technical solution：Based on downlink vertical current constructed wetland structure, by filling cathode conductive filler layer, anode is led
Electric packing layer, plantation wetland plant form microbiological fuel cell-downward vertical artificial wetland coupling arrangement.Further lead to
Inside conductor is crossed to be directly connected to improve electron transfer rate, removal of the consolidation system to total nitrogen.
A kind of method that original position strengthens downward vertical artificial wetland denitrification efficiency using sewage electricity production, its step are as follows：
A, sewage flows into top non-conducting filler layer, root system of plant is main successively continuously by entering simultaneously water distribution uniformity at the top of device
It is distributed in the middle and upper part of this layer, this layer makes this due to the dissolved oxygen brought into the Radial Oxygen Loss from Root effect and water inlet of wetland plant
Aerobic state is mainly presented in region, and part ammonia nitrogen is converted into nitrate nitrogen, the anti-nitre of heterotrophism under nitrifier and nitrococcus effect
Change bacterium and fraction nitrate nitrogen is reduced into nitrogen using organic carbon source as electron donor；
B, anode conducting packing layer is flowed by the sewage of step A, partial organic substances utilize production in the layer by electro-chemical activity bacterium
Raw electronics, unoxidized organic matter are completely removed substantially in this layer, part nitrate nitrogen due to heterotrophic denitrification obtain into
One step removes；The layer directly connects to form " short circuit " by inner lead with cathode conductive filler layer, makees in anode denitrogenation Pseudomonas
With lower generation heterotrophic nitrification, the ammonia nitrogen in sewage is converted to nitrate nitrogen by ammoxidation process；Electro-chemical activity bacterium
The electronics that their metabolism generate is transferred to by inner lead in electron acceptor nitrate nitrogen by respiration, part
Nitrate nitrogen is reduced into nitrogen by anode denitrogenation Pseudomonas；
C, then sewage flows into non-conducting filler separation layer, which functions primarily as anode conducting packing layer and cathode is conductive
The separator of filler interlayer；
D, subsequent sewage flows into cathode conductive filler layer, and the electronics come in this layer via inner lead transmission is used as restoring nitre
The electron donor of hydrochlorate nitrogen, in the case where cathode denitrogenation Pseudomonas acts on, part nitrate nitrogen is reduced into nitrogen.
E, last sewage is flowed out through the drainpipe in the non-conducting filler layer of bottom, and the more conventional downlink of total nitrogen content is hung down in water outlet
The water outlet total nitrogen content of direct current artificial swamp is low, and nitrogen removal rate improves 50-80%.
The sewage is COD/TN≤5 and NO3/TN≥60%。
The electro-chemical activity Pseudomonas is the quasi-microorganism with extracellular electron transmission, including the thin end of the scroll Pseudomonas
（Geobacter）、Pseudomonas（Pseudomonas）、Desulfomonas（Desulfuromonas）Pseudomonas is educated with red
（Rhodoferax）Etc. one such or one to four kinds arbitrary combinations.
The anode denitrogenation Pseudomonas is the nitrification and denitrification Pseudomonas with denitrification functions, including the thin end of the scroll Pseudomonas
（Geobacter）, Zoogloea（Zoogloea）, fixed nitrogen vibrio（Azoarcus）Etc. one such or one to three kinds and not
Lever Pseudomonas（Acinetobacter）, Flavobacterium（Flavobacterium）, Desulfomonas（Dechloromonas）
Etc. one such or one to three kinds arbitrary combinations.
The cathode denitrogenation Pseudomonas is the thin end of the scroll Pseudomonas（Geobacter）, Soxhlet Pseudomonas（Thauera）, acinetobacter
（Acinetobacter）、Dokdonella、FerruginibacterEtc. one such or one to five kinds arbitrary combinations.
Crucial " short circuit " connection type being in step B in above-mentioned five steps, this short-circuit connection type make anode
Region is under high current density environment, be can get faster electron transmission between biomembrane and electrode at this time, is conducive to electrification
Learn active bacteria the thin end of the scroll Pseudomonas（Geobacter）、Pseudomonas（Pseudomonas）Deng enrichment, can promote occur ammoxidation
The acinetobacter of process（Acinetobacter）And Flavobacterium（Flavobacterium）Growth, so that more
Ammonia nitrogen is efficiently converted into nitrate nitrogen, finally in the thin end of the scroll Pseudomonas（Geobacter）, Zoogloea（Zoogloea）Equal nitrate nitrogens
It is converted into nitrogen under reducing bacteria effect and removes.Total nitrogen removal can stablize 75% or more.
A kind of original position strengthens the device of downward vertical artificial wetland denitrification efficiency using sewage electricity production, the device from lower and
On be equipped with bottom non-conducting filler layer, cathode conductive filler layer；Non-conducting filler separation layer；Anode conducting packing layer, top
Non-conducting filler layer；It is characterized in that：Cathode conductive filler layer respectively with bottom non-conducting filler layer, non-conducting filler separation layer
It is connected, anode conducting packing layer is connected with non-conducting filler separation layer, top non-conducting filler layer respectively, in non-conducting filler layer
Wetland plant is planted in top, anode collector, cathode current collector are connected by inside conductor short circuit, anode collector and cathode collection
Electrode is individually positioned in anode conducting packing layer and cathode conductive filler layer, and inside conductor is embedded in anode conducting packing layer and the moon
In the conductive filler layer of pole, both ends are connect with anode collector, cathode current collector respectively.
Strengthen the device of upward vertical flow artificial swamp denitrification efficiency, feature using sewage electricity production in a kind of original position
It is：Filler is granular activated carbon or graphite in the anode packing layer and cathode conductive filler layer；Granular activated carbon grain size
For 1-5mm, specific surface area 500-900m2/ g, packed density 0.45-0.55g/cm3；It is 1- that graphite particle, which fills grain size,
5mm, packed density 1.8-2g/cm3。
The anode collector and cathode current collection extremely graphite felt, graphite rod or stainless steel.
The depth of packing ranging from 60- of the downward vertical artificial wetland-microbiological fuel cell coupling device
120cm。
The device top non-conducting filler layer thickness is 20-30cm, and anode conducting filler layer thickness is 10-30cm,
Non-conducting filler separation layer thickness is 10-20cm, and cathode conductive filler layer thickness is 15-30cm, bottom non-conducting filler thickness
Degree is 5-10m.
The device top non-conducting filler layer, non-conducting filler separation layer, bottom non-conducting filler are gravel, sand
One kind in stone, anthracite, biological ceramic particle or one to four kind any one；
The wetland plant is canna, cyperus alternifolius, reed, giantreed, water sweet thatch, Value of Spartina Anglica, iris, wild rice stem, Lythrum salicaria, open country
Ancient grass, calamus, one kind in napier grass or one to 12 kind of arbitrary combination.
The sewage is COD/TN≤5 and nitrogen form is mainly ammonia nitrogen (NH3/ TN >=60%), the especially rubbish of low concentration
The removal rate of rubbish percolate, sludge-digestion liquid etc., total nitrogen can reach 70% or more.
The residence time of handled sewage in a device is 10 to 48 hours.
In above-mentioned apparatus：1）Wetland plant is planted in the non-conducting filler layer of top so that Root of Wetland Plants is distributed in this
Upper middle part in layer, this set can secrete the aerobic environment that oxygen builds top non-conducting filler layer by root system of plant, to
So that the part ammonia nitrogen in sewage is converted into nitrate nitrogen before flowing into anode packing layer.Experimental result is shown, is planted by wetland
The dissolved oxygen of object Radial Oxygen Loss from Root, top non-conducting filler layer can turn the 20%-30% ammonia nitrogens in sewage up to 1.0-2.5mg/L
It is melted into nitrate nitrogen.2）Anode collector, cathode current collector are connected by inside conductor short circuit so that anode, cathode zone are in
Under high current density environment, faster electron transmission is can get between biomembrane and electrode at this time.Experimental data shows short circuit even
After connecing, it is enriched in the electro-chemical activity bacterium the thin end of the scroll Pseudomonas in cathode and anode region（Geobacter）、Pseudomonas
（Pseudomonas）Deng abundance increase 0.5-2.1 times；The acinetobacter of ammoxidation process occurs（Acinetobacter）
And Flavobacterium（Flavobacterium）Abundance increases 2-3.5 times；Nitrate nitrogen reducing bacteria the thin end of the scroll Pseudomonas（Geobacter）、
Zoogloea（Zoogloea）Abundance increase 1.8-3.5 times；Nitrogen removal rate reaches 68-75%.
The present invention compared with prior art, has the following advantages that and effect：
1, the present invention is connected on the basis of not changing original downward vertical stream wetland construction by simple electrode landfill and conducting wire
It connects, is laid with anode conducting packing layer and cathode conductive filler layer so that under low-carbon, hypoxia condition, occur by anode region
Ammoxidation process by mineralized nitrogen at nitrate nitrogen, and further by the respiration of anode bacterium metabolism generate
Electronics as donor occur denitrification denitrogenation process, the removal efficiency of nitrate nitrogen is enhanced to a certain extent, to improve
The total nitrogen removal effect of low ratio of carbon to ammonium waste water.
2, the short circuit current of Anodic conductive filler layer of the present invention, cathode conductive filler layer and conducting wire composition, it is in situ to utilize
The electric energy that MFC is generated is used for strengthened denitrification, with biological membrane electrode-artificial swamp or electrolytic cell-artificial swamp coupled system phase
Than not needing additional power source not only, but also the electric energy in sewage can be obtained.
3, short circuit operation influences electrode biomembrane group structure by influencing electrode potential, is conducive to the richness of anode electricity production bacterium
Collection and growth, can promote anode that ammoxidation process occurs so that more ammonia nitrogens are efficiently converted into nitrate nitrogen, further pass through
Denitrification removes, and to improve the whole nitrogen removal performance of reactor, is particularly suitable for the low organic carbon water inlet of high ammonia nitrogen.
4, short circuit operation is conducive to the growth and enrichment of Proteobacteria, including the thin end of the scroll Pseudomonas（Geobacter）, desulfurization unit cell
Pseudomonas（Desulfuromonas）, pseudomonas（Pseudomonas）Pseudomonas is educated with red（Rhodoferax）.In addition, short-circuit
Operational mode promotes the growth of denitrogenation Pseudomonas, especially the thin end of the scroll Pseudomonas（Geobacter）, acinetobacter
（Acinetobacter）, fixed nitrogen vibrio（Azoarcus）And Flavobacterium（Flavobacterium）。
Description of the drawings
Fig. 1 is the apparatus structure signal that a kind of original position strengthens downward vertical artificial wetland denitrification efficiency using sewage electricity production
Figure.
Wherein：The bottoms 1- non-conducting filler layer；2- cathode conductive filler layers；3- non-conducting filler separation layers；4- anodes are led
Electric packing layer；The tops 5- non-conducting filler layer；6- wetland plants；7- anode collectors（It buys in the market）；8- cathode current collectors
（It buys in the market）；9- inside conductors（Commonly）.
Specific implementation mode
The specific embodiment of invention is explained and illustrated below in conjunction with attached drawing 1, is not construed as limiting the invention.
Embodiment 1：
A kind of original position strengthens the operation method of downward vertical artificial wetland denitrification efficiency using sewage electricity production, and its step are as follows：
A, sewage continuously enters simultaneously water distribution uniformity by system head, flows into top non-conducting filler layer 5 successively, root system of plant is main
It is distributed in the middle and upper part of this layer, this layer makes this due to the dissolved oxygen brought into the Radial Oxygen Loss from Root effect and water inlet of wetland plant
Aerobic state is presented in region, and part ammonia nitrogen is converted into nitrate nitrogen, heterotrophic denitrifying Bacteria under nitrifier and nitrococcus effect
Fraction nitrate nitrogen is reduced into nitrogen using organic carbon source as electron donor；
B, anode conducting packing layer 4 is flowed by the sewage of step A, partial organic substances are utilized in the layer by electro-chemical activity Pseudomonas
Electronics is generated, unoxidized organic matter is completely removed substantially in this layer, and part nitrate nitrogen is obtained due to heterotrophic denitrification
Further removal；The cathode current collector 8 in anode collector 7 and cathode conductive filler layer 2 in this layer directly passes through inside conductor 9
Connection forms " short circuit ", and heterotrophic nitrification occurs in the case where anode denitrogenation Pseudomonas acts on, the ammonia nitrogen in sewage is passed through ammoxidation
Process is converted to nitrate nitrogen；Electro-chemical activity bacterium anode bacterium leads to the electronics that their metabolism generate by respiration
It crosses inner lead 9 to be transferred in electron acceptor nitrate nitrogen, part nitrate nitrogen is reduced into nitrogen by anode denitrogenation Pseudomonas；
C, then sewage flows into non-conducting filler separation layer 3, which functions primarily as anode conducting packing layer 4 and cathode is led
Separator between electric packing layer 2；
D, subsequent sewage flows into cathode conductive filler layer 2, and transmitting the electronics come via inner lead 9 in this layer is used as restoring
The electron donor of nitrate nitrogen, in the case where cathode denitrogenation Pseudomonas acts on, most of nitrate nitrogen is reduced into nitrogen.
E, last sewage is flowed out through the drainpipe in bottom non-conducting filler layer 1, the more conventional uplink of total nitrogen content in water outlet
The water outlet total nitrogen content of artificial wetland is low, and nitrogen removal rate improves 50-80%.
The sewage is COD/TN≤5 and nitrogen form is mainly ammonia nitrogen (NH3/TN≥60%)。
The electro-chemical activity Pseudomonas is the quasi-microorganism with extracellular electron transmission, including the thin end of the scroll Pseudomonas
（Geobacter）、Pseudomonas（Pseudomonas）、Desulfomonas（Desulfuromonas）Pseudomonas is educated with red
（Rhodoferax）Etc. one such or one to four kinds arbitrary combinations.
The anode denitrogenation Pseudomonas is the nitrification and denitrification Pseudomonas with denitrification functions, including the thin end of the scroll Pseudomonas
（Geobacter）, Zoogloea（Zoogloea）, fixed nitrogen vibrio（Azoarcus）Etc. one such or one to three kinds and not
Lever Pseudomonas（Acinetobacter）, Flavobacterium（Flavobacterium）And Desulfomonas（Dechloromonas）
Etc. one such or one to three kinds arbitrary combinations.
The cathode denitrogenation Pseudomonas is the thin end of the scroll Pseudomonas（Geobacter）, Soxhlet Pseudomonas（Thauera）, acinetobacter
（Acinetobacter）、DokdonellaBelong to、FerruginibacterOne such or arbitrary group of one to five kinds such as belong to
It closes.
The experimental results showed that：Using the device in the present invention, the growth and enrichment of the electricity production Pseudomonas of anode region are significantly improved.
The dominant bacteria the thin end of the scroll Pseudomonas of anode region（Geobacter）Abundance improve 0.8-1.2 times, Desulfomonas
（Desulfuromonas）Abundance improve 8-10 times.
Embodiment 2：
A kind of original position strengthens the device of downward vertical artificial wetland denitrification efficiency using sewage electricity production, which spreads from bottom to top
Equipped with bottom non-conducting filler layer 1, cathode conductive filler layer 2；Non-conducting filler separation layer 3；Anode conducting packing layer 4；It is special
Sign is：Cathode conductive filler layer 2 is connected with bottom non-conducting filler layer 1, non-conducting filler separation layer 3 respectively, anode conducting
Packing layer 4 is connected with non-conducting filler separation layer 3, top non-conducting filler layer 5 respectively, is planted in 5 top of non-conducting filler layer
Wetland plant 6 is planted, anode collector 7, cathode current collector 8 are connected by 9 short circuit of inside conductor, anode collector 7 and cathode current collection
Pole 8 is individually positioned in anode conducting packing layer 4 and cathode conductive filler layer 2, and inside conductor 9 is embedded in anode conducting packing layer 4
And in cathode conductive filler layer 2, both ends are connect with anode collector 7, cathode current collector 8 respectively.
Strengthen the device of downward vertical artificial wetland denitrification efficiency, feature using sewage electricity production in a kind of original position
It is：Filler is granular activated carbon or graphite particle in the anode packing layer 4 and cathode conductive filler layer 2；Seed activity
Charcoal grain size is 1 or 3 or 5mm, and specific surface area is 500 or 600 or 700 or 800 or 900m2/ g, packed density be 0.45 or 0.5 or
0.55g/cm3；It is 1 or 3 or 5mm that graphite particle, which fills grain size, and packed density is 1.8 or 1.9 or 2g/cm3。
The wetland plant 6 be canna, cyperus alternifolius, reed, giantreed, water sweet thatch, Value of Spartina Anglica, iris, wild rice stem, thousand bend
One kind in dish, Arundinella hirta (Thunb.) Tanaka, calamus, napier grass or one to 12 kind of arbitrary combination.
The anode collector 7 and cathode current collector 8 is graphite felt, graphite rod or stainless steel.
Strengthen the filler of the device of downward vertical artificial wetland denitrification efficiency using sewage electricity production in a kind of original position
Thickness range is 60 or 70 or 80 or 90 or 100 or 110 or 120cm.
5 thickness of top non-conducting filler layer is 20 or 25 or 30cm, and 4 thickness of anode conducting packing layer is 10 or 15
Or 20 or 25 or 30cm, 3 thickness of non-conducting filler separation layer be 10 or 15 or 20cm, 2 thickness of cathode conductive filler layer be 15 or
20 or 25 or 30cm, 1 thickness of bottom non-conducting filler layer are 5 or 8 or 10m.
The bottom of device non-conducting filler layer 1, non-conducting filler separation layer 3, top non-conducting filler layer 5 are gravel
One kind in stone, sandstone, anthracite, biological ceramic particle or one to four kind.
Handled sewage is low ratio of carbon to ammonium（C/N≤5 and NH3/TN≥60%）The rubbish of sewage, especially low concentration oozes
Filtrate, sludge-digestion liquid etc..After device processing, nitrogen removal rate is up to 80% or more.
The residence time of handled sewage in a device is 10 to 48 hours.
The experimental results showed that：Removal using the more conventional downward vertical artificial wetland of the device in the present invention to total nitrogen
30-60% can be improved in rate.
Claims (7)
1. a kind of method that original position strengthens downward vertical artificial wetland denitrification efficiency using sewage electricity production, step are：
A, sewage flows into top non-conducting filler layer, root system of plant distribution successively continuously by entering simultaneously water distribution uniformity at the top of device
In the middle and upper part of this layer, this layer keeps region presentation aerobic by the dissolved oxygen brought into the Radial Oxygen Loss from Root of wetland plant and water inlet
State, ammonia nitrogen are converted into nitrate nitrogen under nitrifier and nitrococcus, and heterotrophic denitrifying Bacteria is using organic carbon source as electronics
Nitrate nitrogen is reduced into nitrogen by donor；
B, by step（A）Sewage flow into anode conducting packing layer, organic matter the layer by electro-chemical activity bacterium using generate
Electronics, unoxidized organic matter are removed in this layer, and part nitrate nitrogen heterotrophic denitrification is removed；The layer and cathode are conductive
Packing layer directly connects to form short circuit by inner lead, and heterotrophic nitrification occurs in the case where anode denitrogenation Pseudomonas acts on, will be dirty
Ammonia nitrogen in water is converted to nitrate nitrogen by ammoxidation process；Electro-chemical activity bacterium is by breathing the electricity that metabolism is generated
Son is transferred to by inner lead in electron acceptor nitrate nitrogen, and part nitrate nitrogen is reduced into nitrogen by anode denitrogenation Pseudomonas；
C, then sewage flows into non-conducting filler separation layer, this layer is point of anode conducting packing layer and cathode conductive filler interlayer
Every device；
D, subsequent sewage flows into cathode conductive filler layer, and the electronics come in this layer via inner lead transmission is used as restoring nitre
The electron donor of hydrochlorate nitrogen, in the case where cathode denitrogenation Pseudomonas acts on, most of nitrate nitrogen is reduced into nitrogen；
E, last sewage is flowed out through the drainpipe in the non-conducting filler layer of bottom, and total nitrogen content downward vertical turning flow artificial is wet in water outlet
The total nitrogen on ground removes；
The electro-chemical activity Pseudomonas is the quasi-microorganism with extracellular electron transmission, including the thin end of the scroll Pseudomonas、Pseudomonad
Belong to、Desulfomonas and red educate that Pseudomonas is one such or one to four kinds of arbitrary combination；
The anode denitrogenation Pseudomonas is nitrification and denitrification Pseudomonas, including the thin end of the scroll Pseudomonas, Zoogloea, fixed nitrogen vibrio are wherein
One kind or one to three kinds and acinetobacter, Flavobacterium, dechlorination zygosaccharomyces be one such or one to three kinds arbitrary
Combination；
The cathode denitrogenation Pseudomonas is the thin end of the scroll Pseudomonas, Soxhlet Pseudomonas, acinetobacter、DokdonellaBelong to、 FerruginibacterOne such or one to five kinds of the arbitrary combination such as belong to.
2. a kind of original position described in claim 1 strengthens the dress of downward vertical artificial wetland denitrification efficiency using sewage electricity production
It sets, which is equipped with bottom non-conducting filler layer from bottom to top（1）, cathode 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：Cathode conductive filler layer（2）Respectively with
Bottom non-conducting filler layer（1）, non-conducting filler separation layer（3）It is connected, anode conducting packing layer（4）Respectively with non-conducting filler
Separation layer（3）, top non-conducting filler layer（5）It is connected, in non-conducting filler layer（5）Wetland plant is planted in top（6）, anode
Collector（7）, cathode current collector（8）Pass through inside conductor（9）Short circuit connection, anode collector（7）And cathode current collector（8）Respectively
It is placed on anode conducting packing layer（4）And cathode conductive filler layer（2）It is interior, inside conductor（9）It is embedded in anode conducting packing layer（4）
And cathode conductive filler layer（2）It is interior, both ends respectively with anode collector（7）, cathode current collector（8）Connection.
3. downward vertical artificial wetland denitrification efficiency is strengthened in a kind of original position according to claim 2 using sewage electricity production
Device, it is characterised in that：The anode packing layer（4）With cathode conductive filler layer（2）Interior filler is granular activated carbon or stone
Black particle；Granular activated carbon grain size is 1-5mm, specific surface area 500-900m2/ g, packed density 0.45-0.55g/
cm3；It is 1-5mm, packed density 1.8-2g/cm that graphite particle, which fills grain size,3。
4. downward vertical artificial wetland denitrification efficiency is strengthened in a kind of original position according to claim 2 using sewage electricity production
Device, it is characterised in that：The wetland plant（6）For canna, cyperus alternifolius, reed, giantreed, water sweet thatch, Value of Spartina Anglica, kite
One kind in tail, wild rice stem, Lythrum salicaria, Arundinella hirta (Thunb.) Tanaka, calamus, napier grass or one to 12 kind of arbitrary combination.
5. downward vertical artificial wetland denitrification efficiency is strengthened in a kind of original position according to claim 2 using sewage electricity production
Device, it is characterised in that：The anode collector（7）And cathode current collector（8）For graphite felt, graphite rod or stainless steel
Matter.
6. downward vertical artificial wetland denitrification efficiency is strengthened in a kind of original position according to claim 2 using sewage electricity production
Device, it is characterised in that：The top non-conducting filler layer（5）Thickness is 20-30cm, anode conducting packing layer（4）It is thick
Degree is 10-30cm, non-conducting filler separation layer（3）Thickness is 10-20cm, cathode conductive filler layer（2）Thickness is 15-
30cm, bottom non-conducting filler layer（1）Thickness is 5-10m.
7. downward vertical artificial wetland denitrification efficiency is strengthened in a kind of original position according to claim 2 using sewage electricity production
Device, it is characterised in that：The bottom of device non-conducting filler layer（1）, non-conducting filler separation layer（3）, top it is non-conductive
Packing layer（5）For in gravel, sandstone, anthracite, biological ceramic particle one kind or one to four kind.
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| CN114853149B (en) * | 2022-04-15 | 2023-02-24 | 郑州轻工业大学 | CW-MFC system quick start method and device for treating low-carbon wastewater |
| CN115109719B (en) * | 2022-05-26 | 2023-08-11 | 龙江环保集团股份有限公司 | Ceramic-based bacteria with flocculation and low-temperature biological denitrification functions and application thereof |
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