CN108383232A - A kind of method and device improving downward vertical artificial wetland nitrate nitrogen removal efficiency - Google Patents
A kind of method and device improving downward vertical artificial wetland nitrate nitrogen removal efficiency Download PDFInfo
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- CN108383232A CN108383232A CN201810289283.4A CN201810289283A CN108383232A CN 108383232 A CN108383232 A CN 108383232A CN 201810289283 A CN201810289283 A CN 201810289283A CN 108383232 A CN108383232 A CN 108383232A
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
- C02F3/306—Denitrification of water in soil
-
- 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
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
-
- 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
- C02F3/341—Consortia of bacteria
-
- 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
Abstract
The invention discloses the method and device that a kind of raising downward vertical artificial wetland nitrate nitrogen removes efficiency, steps：A, sewage is continuously by entering simultaneously water distribution uniformity at the top of device；B, anode conducting packing layer is flowed into through sewage, nitrate nitrogen heterotrophic denitrification is removed；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, the total nitrogen removal 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 pass through outer conductor and the closed circuit connection of external resistance.Method is simple, simple operation, in situ using producing electricl energy, and significantly improves low C/N 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-nitrogen sewage（Sanitary sewage, sewage treatment plant tail water, agricultural area source, underground water etc.）When total nitrogen go
Except the operation method of efficiency, also relates to a kind of original position and strengthen downward vertical artificial wetland denitrification efficiency using sewage electricity production
Device.
Background technology
Low ratio of carbon to ammonium（C/N ≤5）It is wastewater treatment in China plant tail water（Middle water）Characteristic feature, conventional biochemical handle work
Skill（Such as activated sludge process, biofilm）Because carbon source deficiency causes nitric efficiency low in denitrification process, effluent quality is difficult
To meet increasingly strict discharge standard requirement, the ecological water water quality inferiority required with ecological environment is away from bigger.And add methanol, second
Though biological denitrification process can be improved in the organic carbon sources such as alcohol, 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.Though there is abundant carbon source supply approach in artificial wet land system（Microorganism
With the decomposition of dead plants, the release of organic matter is deposited in plant root exudation, matrix）And Approach of Removal of Nitrogen（Symbiosis it is aerobic, detest
The denitrification microorganisms such as oxygen, autotrophy, heterotrophism, matrix absorption, plant absorption etc.）, but for influent COD/NO3 -（≤5）Sewage,
Still suffer from the problem that total nitrogen removal ability is limited caused by carbon source deficiency（Jan Vymazal, Removal of
nutrients in various types of constructed wetlands, in Science of the Total
Environment, 2007,48-65.）.How its denitrification efficiency is further increased, it has also become current artificial swamp in the world
The hot and difficult issue of denitrogenation technical research.
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 synchronous nitration and denitrification process mainly occurs for aerobic cathode MFC denitrogenations, in order to make biomembrane surface layer microorganism send out
For raw nitrification by ammonium oxidation at nitrate nitrogen, DO cannot be too low（Virdis B., et al., Simultaneous
nitrification, denitrification and carbon removal in microbial fuel cells.
Water Research, 2010,44(9):2970-2980）.
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
Low-carbon is high
The present invention compared with prior art, has the following advantages that and effect：Nitrate sewage, how without mechanical aeration
Under the conditions of realize that the efficient denitrification of CW-MFC systems is also current one of Research Challenges.
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 the high nitrate nitrogen of low-carbon（Such as sewage treatment plant tail water, surface water, underground water）Total nitrogen removal effect
The operation method of energy, method is simple and practicable, simple operation, in situ using the electric energy generated, is remarkably improved the total of low C/N sewage
Nitrogen removal effect.
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 the high nitrate nitrogen sewage total nitrogen removal efficiency of low-carbon, simple in structure, easy to assembly, has been remarkably improved
The denitrification effect of downward vertical artificial wetland under the conditions of machine carbon source lacks.
In order to achieve the above purpose, the present invention uses following technical measures：
By the Qian He of microbiological fuel cell and downward vertical artificial wetland, extrernal resistance is adjusted, makes system in stable electric current
Under density, it is enriched with more rich various electricity production and denitrification functions microorganism in anode region and cathodic region, it is in situ to utilize electric energy simultaneously
Nitrate nitrogen is eventually converted into nitrogen and is removed.
Technical solution：Based on downlink vertical current constructed wetland structure, by filling cathode conductive filler layer, anode is led
Electric packing layer plants wetland plant and connecting wire and extrernal resistance, it is wet to form microbiological fuel cell-downward vertical turning flow artificial
Ground coupling arrangement.Extrernal resistance is adjusted, by being enriched in electricity production and the denitrification functions microorganism of electrode zone under stabling current, strengthens system
The removal united to total nitrogen.
A method of it improving downward vertical artificial wetland nitrate nitrogen and removes efficiency, its step are as follows：
A, sewage continuously enters simultaneously water distribution uniformity by system head, flows into top non-conducting filler layer successively, and 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 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, and part nitrate nitrogen is in the case where anode denitrogenation Pseudomonas acts on
It is further removed by heterotrophic denitrification；
C, then sewage flows into non-conducting filler separation layer, which functions primarily as anode conducting packing layer and cathode is led
The separator of electric filler interlayer；
D, subsequent sewage flows into cathode conductive filler layer, in this layer from the generation of step b Anodic conductive filler layers and via outer
The electronics that circuit lead migration comes is used as restoring the electron donor of nitrate nitrogen, most of in the case where cathode denitrogenation Pseudomonas acts on
Nitrate nitrogen is reduced into nitrogen by autotrophic denitrification, heterotrophic denitrification process.
E, last sewage is flowed out through the drainpipe in the non-conducting filler layer of bottom, the more conventional downstream of total nitrogen content in water outlet
Artificial swamp is low, and nitrate nitrogen removal rate improves 30-60%.
Handled sewage is C/N≤5, NO3 -/TN≥60%。
The electro-chemical activity bacterium is the quasi-microorganism with extracellular electron transmission, including the thin end of the scroll Pseudomonas（Geobact er）、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）、
Pseudomonas（Pseudomonas）、Soxhlet Pseudomonas（Thauera）, acinetobacter（Acinetobacter）, Zoogloea
（Zoogloea）, Exiguobacterium sp category（Exiguobacterium）, Flavobacterium（Flavobacterium）WithDechloromonasEtc. one such or one to seven 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.
Key is that step B and D, electronics are generated from anode conducting packing layer and via external circuit in above-mentioned five steps
Conducting wire moves to cathode packing layer, and stable low current density is conducive to anode region and cathodic region and is enriched with more rich various electricity production
With denitrification functions microorganism, including autotrophic denitrification bacterium and heterotrophic denitrifying Bacteria, such as the thin end of the scroll Pseudomonas（Geobacter）, false unit cell
Pseudomonas（Pseudomonas）、Soxhlet Pseudomonas（Thauera）, acinetobacter（Acinetobacter）, Zoogloea
（Zoogloea）, Exiguobacterium sp category（Exiguobacterium）And Flavobacterium（Flavobacterium）Deng.Be conducive to nitric acid
Salt nitrogen is eventually converted into nitrogen and removes, and the removal of nitrate nitrogen can stablize 70% or more.
A kind of device improving downward vertical artificial wetland nitrate nitrogen removal efficiency, the device are equipped with from bottom to top
Bottom non-conducting filler layer, cathode conductive filler layer；Non-conducting filler separation layer；Anode conducting packing layer；It is characterized in that：It is cloudy
Pole conductive filler layer is connected with bottom non-conducting filler layer, non-conducting filler separation layer respectively, anode conducting packing layer respectively with
Non-conducting filler separation layer, top non-conducting filler layer are connected, and wetland plant, anode collection are planted in non-conducting filler layer top
Electrode, cathode current collector pass through outer conductor and external resistance connection composition closed circuit, anode collector and cathode current collector point
It is not placed in anode conducting packing layer and cathode conductive filler layer, outer conductor is positioned over outside wetland, outer conductor one end and sun
Pole collector connection, the outer conductor other end are connect with external resistance and cathode current collector successively.
A kind of device of the raising upward vertical flow artificial swamp nitrate nitrogen removal efficiency, it is characterised in that：
Filler is granular activated carbon or graphite in the anode packing layer and cathode conductive filler layer；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 that graphite particle, which fills grain size,
Packed density is 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.
Handled sewage is low ratio of carbon to ammonium（C/N≤5, NO3 -/TN≥60%）Sewage, including surface water, underground water and two
Grade sewage treatment plant tail water etc..The removal rate of total nitrogen can reach 70% or more.
The residence time of handled sewage in a device is 20 to 48 hours.
In above-mentioned apparatus：1）Cathode conductive filler layer respectively with bottom non-conducting filler layer, non-conducting filler separation layer phase
Even so that cathode conductive filler layer be in anaerobic environment, formation anaerobic organism cathode, nitrate nitrogen electron acceptor quilt as priority
It is reduced into nitrogen.Experimental data is shown：When anaerobic organism cathode dissolution oxygen reaches 0.5mg/L or more, electricity production declines 60%, nitre
Hydrochlorate removal rate declines 50%.2）Anode conducting packing layer respectively with non-conducting filler separation layer, top non-conducting filler layer phase
Even, and root system of plant is distributed in the non-conducting filler layer of top, it is ensured that the anaerobic environment of anode conducting packing layer.3）Anode collection
Electrode, cathode current collector are connected by the way that outer conductor is closed circuit by resistance, and electronics generates from anode conducting packing layer and via dispatch from foreign news agency
Line conductor moves to cathode packing layer, and stable low current density is conducive to anode region and cathodic region and is enriched with more rich various production
Electricity and denitrification functions microorganism.Experimental result is shown：After the closed circuit resistance connection of outer conductor, autotrophic denitrification bacterium and heterotrophic denitrification
Bacterium increases to 7 kinds；Wherein the thin end of the scroll Pseudomonas（Geobacter）, pseudomonas（Pseudomonas）、Soxhlet Pseudomonas
（Thauera）, acinetobacter（Acinetobacter）, Zoogloea（Zoogloea）, Exiguobacterium sp category
（Exiguobacterium）And Flavobacterium（Flavobacterium）Abundance increase separately 1.5 times, 0.6 times, 6 times, 0.8
Again, 1.2 times, 0.8 times, 1.6 times；The removal rate of nitrate nitrogen reaches 70.3%.
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, anode conducting packing layer and cathode conductive filler layer is laid with, by the production for being enriched in anode region and cathodic region under stabling current
Electricity and denitrification functions microorganism, strengthen denitrification denitrogenation process under the conditions of low organic carbon, to improve low ratio of carbon to ammonium waste water
Total nitrogen removal effect.
2, the closure that Anodic conductive filler layer of the present invention, cathode conductive filler layer are formed with dispatch from foreign news agency line conductor, external resistance
Circuit, the electric energy in situ for utilizing MFC to generate is used for strengthened denitrification, with biological membrane electrode-artificial swamp or electrolytic cell-Manual moist
Ground coupled system is compared, and does not need additional power source not only, but also can obtain the electric energy in sewage.
Description of the drawings
Fig. 1 is a kind of apparatus structure schematic diagram in situ for improving downward vertical artificial wetland nitrate nitrogen and removing efficiency.
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- outer conductors（Commonly）；10- external resistances（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 operation method improving downward vertical artificial wetland nitrate nitrogen removal efficiency, 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 utilize production in the layer by electro-chemical activity bacterium
Raw electronics, unoxidized organic matter are completely removed substantially in this layer, and part nitrate nitrogen is in the case where anode denitrogenation Pseudomonas acts on
It is further removed by denitrification；
C, then sewage flows into non-conducting filler separation layer 3, which functions primarily as anode conducting packing layer and cathode is led
The separator of electric filler interlayer；
D, subsequent sewage flows into cathode conductive filler layer 2, generate in this layer from step B Anodics conductive filler layer 4 and via
The electronics that dispatch from foreign news agency line conductor 9 and the migration of external resistance 10 come is used as restoring the electron donor of nitrate nitrogen, in cathode denitrogenation Pseudomonas
Under effect, most of nitrate is reduced into nitrogen by autotrophic denitrification, heterotrophic denitrification process；
E, last sewage is flowed out through the drainpipe in bottom non-conducting filler layer 1, the more conventional uplink of nitrate nitrogen content in water outlet
Artificial wetland is low, and nitrate nitrogen removal improves 30-60%.
The sewage is with low-carbon high-nitrogen（COD/TN≤5, and NO3 -/TN≥60%）A kind of sewage of feature, including ground
Table water, underground water and secondary sewage processing plant tail water etc..
The electro-chemical activity bacterium 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）, pseudomonas（Pseudomonas）、Soxhlet Pseudomonas（Thauera）, acinetobacter
（Acinetobacter）, Zoogloea（Zoogloea）, Exiguobacterium sp category（Exiguobacterium）, Flavobacterium
（Flavobacterium）WithDechloromonasEtc. one such or one to eight 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：After the operation method, the enrichment of the electricity production Pseudomonas of anode region significantly improves, superiority bacteria spp the thin end of the scroll
Pseudomonas（Geobacter）Abundance improve 0.8-1.2 times；The diversity of denitrogenation Pseudomonas significantly improves, and total abundance improves 25-40%,
Soxhlet Pseudomonas（Thauera）Abundance improve 3-6 times.
Embodiment 2：
A kind of device improving downward vertical artificial wetland nitrate nitrogen removal efficiency, the structure are equipped with bottom from bottom to top
Non-conducting filler layer 1, cathode conductive filler layer 2；Non-conducting filler separation layer 3；Anode conducting packing layer 4；It is characterized in that：It is cloudy
Pole conductive filler layer 2 is connected with bottom non-conducting filler layer 1, non-conducting filler separation layer 3 respectively, and anode conducting packing layer 4 divides
It is not connected with non-conducting filler separation layer 3, top non-conducting filler layer 5, wetland plant is planted in 5 top of non-conducting filler layer
6, anode collector 7, cathode current collector 8 pass through outer conductor 9 and the connection composition closed circuit of external resistance 10, anode collector 7
It is individually positioned in anode conducting packing layer 4 and cathode conductive filler layer 2 with cathode current collector 8, outer conductor 9 is positioned over outside wetland
Portion, 9 one end of outer conductor are connect with anode collector 7, and 9 other end of outer conductor is connect with external resistance 10 and cathode current collector 8 successively.
A kind of device of the raising downward vertical artificial wetland nitrate nitrogen removal efficiency, it is characterised in that：Institute
Filler is granular activated carbon or graphite particle in the anode packing layer 4 and cathode conductive filler layer 2 stated；Granular activated carbon grain size is
1 or 3 or 5mm, specific surface area are 500 or 600 or 700 or 800 or 900m2/ g, packed density are 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.
The sewage is with low-carbon high-nitrogen（COD/TN≤5, and NO3 -/TN≥60%）A kind of sewage of feature, including ground
Table water, underground water and secondary sewage processing plant tail water etc..After device processing, nitrate nitrogen removal rate is up to 60% or more.
The residence time of handled sewage in a device is 20 to 48 hours.
The experimental results showed that：Using the more conventional downward vertical artificial wetland of the device in the present invention to nitrate nitrogen
30-60% can be improved in removal rate.
Claims (7)
1. a kind of method improving downward vertical artificial wetland nitrate nitrogen removal efficiency, 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, partial organic substances utilize in the layer by electro-chemical activity bacterium
Electronics is generated, unoxidized organic matter is removed in this layer, and part nitrate nitrogen heterotrophic denitrification is removed；
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, in this layer from the generation of step B Anodic conductive filler layers and via outer
The electronics that circuit lead migration comes is used as restoring the electron donor of nitrate nitrogen, most of in the case where cathode denitrogenation Pseudomonas acts on
Nitrate nitrogen is reduced into nitrogen by autotrophic denitrification, heterotrophic denitrification process；
E, last sewage is flowed out through the drainpipe in the non-conducting filler layer of bottom, the more conventional downlink turning flow artificial of total nitrogen content in water outlet
The nitrogen removal rate of wetland is higher, and nitrogen removal rate improves 30-60%；
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、Ferruginiba cterOne such or one to five kinds of the arbitrary combination such as belong to.
2. a kind of device improving downward vertical artificial wetland nitrate nitrogen removal efficiency described in claim 1, the device
It 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
Conductive filler layer（4）, top non-conducting filler layer（5）, it is characterised in that：Cathode conductive filler layer（2）Respectively with bottom is non-leads
Electric packing 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）Plant wetland plant in middle and upper part（6）, anode collector
（7）, cathode current collector（8）Pass through outer conductor（9）And external resistance（10）Connection composition closed circuit, anode collector（7）And the moon
Pole collector（8）It is individually positioned in anode conducting packing layer（4）And cathode conductive filler layer（2）It is interior, outer conductor（9）It is positioned over wet
Outside ground, outer conductor（9）One end is connect with anode collector 7, outer conductor（9）The other end successively with external resistance（10）With cathode collection
Electrode（8）Connection.
3. a kind of device improving downward vertical artificial wetland nitrate nitrogen removal efficiency according to claim 2,
It is characterized in that：The anode packing layer（4）With cathode conductive filler layer（2）Interior filler is granular activated carbon or graphite particle；
Granular activated carbon grain size is 1-5mm, specific surface area 500-900m2/ g, packed density 0.45-0.55g/cm3；Graphite
Grain filling grain size is 1-5mm, packed density 1.8-2g/cm3。
4. a kind of device improving downward vertical artificial wetland nitrate nitrogen removal efficiency according to claim 2,
It is characterized in that：The wetland plant（6）For canna, cyperus alternifolius, reed, giantreed, water sweet thatch, Value of Spartina Anglica, iris, wild rice stem,
One kind in Lythrum salicaria, Arundinella hirta (Thunb.) Tanaka, calamus, napier grass or one to 12 kind of arbitrary combination.
5. a kind of device improving downward vertical artificial wetland nitrate nitrogen removal efficiency described in claim 1, feature
It is：The anode collector（7）And cathode current collector（8）For graphite felt, graphite rod or stainless steel.
6. a kind of device improving downward vertical artificial wetland nitrate nitrogen removal efficiency according to claim 2,
It is characterized in that：The top non-conducting filler layer（5）Thickness is 20-30cm, anode conducting packing layer（4）Thickness is 10-
30cm, non-conducting filler separation layer（3）Thickness is 10-20cm, cathode conductive filler layer（2）Thickness is 15-30cm, and bottom is non-
Conductive filler layer（1）Thickness is 5-10m.
7. a kind of device improving downward vertical artificial wetland nitrate nitrogen removal efficiency according to claim 2,
It is characterized in that：The bottom of device non-conducting filler layer（1）, non-conducting filler separation layer（3）, top non-conducting filler layer
（5）For in gravel, sandstone, anthracite, biological ceramic particle one kind or one to four kind.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810289283.4A CN108383232B (en) | 2018-04-03 | 2018-04-03 | Method and device for improving nitrate nitrogen removal efficiency of downward vertical flow constructed wetland |
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| CN111777188A (en) * | 2020-07-20 | 2020-10-16 | 中国科学院水生生物研究所 | Method and device for online predicting and slowing down biological blockage of vertical-flow constructed wetland |
| CN111777187A (en) * | 2020-07-20 | 2020-10-16 | 中国科学院水生生物研究所 | Method and device for interactively relieving biological blockage of constructed wetland in situ |
| CN111908612A (en) * | 2020-08-27 | 2020-11-10 | 河海大学 | Artificial wetland coupling system for denitrification of urban sewage |
| CN112299550A (en) * | 2020-10-14 | 2021-02-02 | 武汉轻工大学 | Domestic sewage treatment system and debugging method |
| CN113540542A (en) * | 2021-07-27 | 2021-10-22 | 桂林理工大学 | Microbial battery for constructed wetland |
| CN114162974A (en) * | 2021-12-03 | 2022-03-11 | 哈尔滨工业大学（深圳） | Weak current intervention constructed wetland system for efficiently degrading parachloronitrobenzene and operation method |
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| CN116002846A (en) * | 2022-12-21 | 2023-04-25 | 山西青舟环境科技有限公司 | A anti-nitrosation wetland for sewage treatment |
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| CN111777188A (en) * | 2020-07-20 | 2020-10-16 | 中国科学院水生生物研究所 | Method and device for online predicting and slowing down biological blockage of vertical-flow constructed wetland |
| CN111777187A (en) * | 2020-07-20 | 2020-10-16 | 中国科学院水生生物研究所 | Method and device for interactively relieving biological blockage of constructed wetland in situ |
| CN111777187B (en) * | 2020-07-20 | 2021-09-24 | 中国科学院水生生物研究所 | Method and device for interactively relieving biological blockage of constructed wetland in situ |
| CN111777188B (en) * | 2020-07-20 | 2021-09-24 | 中国科学院水生生物研究所 | Method and device for online predicting and slowing down biological blockage of vertical-flow constructed wetland |
| CN111908612A (en) * | 2020-08-27 | 2020-11-10 | 河海大学 | Artificial wetland coupling system for denitrification of urban sewage |
| CN112299550A (en) * | 2020-10-14 | 2021-02-02 | 武汉轻工大学 | Domestic sewage treatment system and debugging method |
| CN113540542A (en) * | 2021-07-27 | 2021-10-22 | 桂林理工大学 | Microbial battery for constructed wetland |
| CN114162974A (en) * | 2021-12-03 | 2022-03-11 | 哈尔滨工业大学（深圳） | Weak current intervention constructed wetland system for efficiently degrading parachloronitrobenzene and operation method |
| CN114195266A (en) * | 2021-12-03 | 2022-03-18 | 哈尔滨工业大学（深圳） | Low-temperature denitrification enhanced weak current intervention constructed wetland system and operation method thereof |
| CN116002846A (en) * | 2022-12-21 | 2023-04-25 | 山西青舟环境科技有限公司 | A anti-nitrosation wetland for sewage treatment |
| CN116002846B (en) * | 2022-12-21 | 2023-11-21 | 山西青舟环境科技有限公司 | A anti-nitrosation wetland for sewage treatment |
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