CN108706732A - A kind of method and device for cutting down eutrophication water endogenous nitrogen using submerged plant coupling microbiological fuel cell - Google Patents
A kind of method and device for cutting down eutrophication water endogenous nitrogen using submerged plant coupling microbiological fuel cell Download PDFInfo
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Abstract
The invention discloses a kind of method and device for cutting down eutrophication water endogenous nitrogen using submerged plant coupling microbiological fuel cell, step is：A, planting submerged plant is planted in eutrophic water deposit；B, anode plate is buried under sediment layer-water termination, near submerged plant root system；C, cathode plate is set at water-air interface, cathode material is made to be suspended in the water surface, cathode plate portion exposes in air；D, anode plate and cathode plate conducting wire is connected with external resistance, forms current loop.Submerged plant takes root in bed mud, trepanning passes through submerged plant plant, under mud-water termination in the middle part of anode plate, and in mud-water termination, cathode plate is suspended at overlying water layer-Air Interface overlying water layer, outer conductor one end is connect with anode plate, and the other end is connected with external resistance, cathode plate respectively.Method is simple, simple operation, simple in structure, and becoming gaseous nitrogen by denitrification process removes water body, significantly reduces substrate sludge nitrogen nutrient concentration.
Description
Technical field
The invention belongs to the ecological restoration technical fields of the polluted water bodies such as lake, river, irrigation canals and ditches, are more particularly to one kind
The cutting method of eutrophication water endogenous nitrogen also relates to a kind of utilization submerged plant coupling microbiological fuel cell reduction
The device of eutrophication water endogenous nitrogen, the water body nitrogen high for the especially endogenous nitrogen content of eutrophication water removal.
Background technology
Body eutrophication is the global great water environmental problems faced at present and in the quite a long period from now on.As
The accumulation of nutritive salt necessary to phytoplankton growth, nitrogen, phosphorus is the major reason of body eutrophication.With a section dirty, drainage
Etc. external sources control measure implementation, the nitrogen phosphorus release in endogenous deposit becomes the dominant factor of body eutrophication.
Nitrogen is one of main limiting factor of lake eutrophication, and bottom mud in lake is main " source " and " remittance " of nitrogen.Water body
Between bed mud nitrogen exchange be Water source and one of the main process of whereabouts.The exchange of water-mud interface nutritive salt is
The process of one physics, chemistry and biological synthesis.Nutrient concentrations are often more much higher than in overlying water in Interstitial Water, this substance
Substance diffusion transfer process caused by concentration gradient is one of the main process of water-Sediment Interface substance cycle.Deposit
It is the important sources of various nitrogen forms in overlying water and Interstitial Water, nitrogen form present in deposit is divided into inorganic nitrogen and organic
Nitrogen, wherein mainly based on organic nitrogen.Organic nitrogen is mainly based on humus and organic matter.By the ammoniation of microorganism
Ammonia nitrogen is resolved into, a part of ammonia nitrogen enters Interstitial Water and enters overlying water through diffusion into the surface by diffusion, and a part of ammonia nitrogen exists
Nitrate nitrogen being converted by nitrification when aerobic state and entering overlying water, in anaerobic state, ammonia nitrogen and nitrate nitrogen be again
Denitrification occurs or denitrification forms N2O or N2Discharge outlet system.
The oxidation-reduction potential of DO and bed mud is an important factor for influencing substrate sludge nitrogen release rule.When under anaerobic state,
In the inorganic nitrogen of dissolution, the overwhelming majority is ammonia nitrogen, and ammonia nitrogen is essentially from the mineralization of organic matter and the ammonification of organic nitrogen at this time
Effect；When water body shows aerobic state, nitrogen is dissolved out in the form of nitrate nitrogen.From the aerobic shape of electrochemistry angle analysis
Deposit-water termination has higher oxidation-reduction potential when state, and electronics has the possibility from reduction-state to oxidation state at this time；
It is analyzed in terms of microorganism, aerobic nitrifier plays key effect in this variation, ammonia nitrogen quilt in deposit and overlying water
The oxidation by nitrobacteria on deposit surface layer is at nitrate nitrogen, and the burst size of nitrate nitrogen increases in deposit, and ammonia nitrogen rate of release subtracts
It is small.Nitrobacteria can convert most ammonia-nitrogen in water body to nitrate nitrogen by nitrification when aerobic state so that bed mud
The effect of ammonia nitrogen is discharged by certain counteracting to overlying water.It will appear in water body ammonia nitrogen concentration when nitrification is strong not
The case where raising declines to a great extent instead；Additionally due to microorganism is big to the demand of nitrogen under aerobic state, at this time with nitrate nitrogen
The nitrogen nutrition salt amount of form release is usually fewer than under anaerobic condition.More and more researchs now think that water body keeps appropriate molten
Solution oxygen level can effectively inhibit the release of nitrogen nutrition salt especially ammonia nitrogen in deposit.
Organic nitrogen in bed mud is acted on through microbial mineralization generates ammonia nitrogen, and the ammonia nitrogen of release initially enters bed mud Interstitial Water
In, and diffuse further into water-mud interface and overlying water, nitrite and nitre are quickly oxidized into the case of aerobic
Hydrochlorate.When the nitrate concentration of overlying water is higher than deposit, deposit muddy water also can be reversely diffused into along concentration gradient
Interface, under the action of denitrifying bacteria, reduction generates the gases such as nitrogen, nitric oxide, nitrous oxide dissipation such as air, drop
The pollutional load of low water body nitrogen.Denitrification can carry out inside the deposit with certain partial pressure of oxygen, and reaction rate relies on
The concentration of nitrate nitrogen in overlying water, and be positively correlated.In deposit Aerobic-anaerobic interface, aerobic environment can promote aerobic
A part of ammonium oxidation, the limitation of oxygen amount can be made ammonium oxidation rest on the nitrite stage by ammonia oxidation bacteria again, and nitrification is not
The entirely possible accumulation for causing nitrite.Ammonia nitrogen, nitrite and anaerobic environment can promote the generation of anaerobic ammonium oxidation process.
Anammox and denitrification in deposit are the main paths of nitrate removal.Nitrification provides nitre for denitrification
Acid group, to make nitrate become the tie of nitrification and denitrification.Therefore, the certain journey of the endogenous denitrification speed of action
Depending on the activity of neighbouring nitrifier and effect on degree.Promote the mineralising of deposit organic nitrogen, nitrification etc. that can promote denitrification
The removal of nitrogen.Therefore, it is necessary to improve the redox environment of deposit, from anaerobism to anoxic or even aerobic transformation to inhibit endogenous
N discharges.
Submerged plant is between water-mud, water-gas and water-land interface, to the cycle and biography of ecosystem substance, energy
Regulating and controlling effect has been passed, there is good clean-up effect.Submerged plant can directly absorb in bed mud and water body during growth
Nitrogen can cause the change of overlying water pH, oxidation-reduction potential and algae content by its root system, blade release oxygen as nutrition
Change, promote the mineralising of endogenous N, nitrifies, and root exudates can then remarkably promote deposit denitrification process.Submerged plant group
It is also the Main Factors for influencing deposit Nutrient release and buffering settling flux caused by disturbance of the stormy waves to deposit to fall.Heavy water
Revegetation has become the sustainable effective measures of the degenerations Sediments nitrogen such as nutrition enriched shallow lake, river, irrigation canals and ditches reduction.
But submerged plant is faced in initial stages of restoration, and some such as water levels are too deep, stormy waves is excessive, and substrate anaerobism, nitrogen phosphorus are dense
The stress habitat obstacles such as high, substrate is really up to the mark, and water transparency is too low, planktonic algae competes are spent, cause submerged plant to be difficult to fixed
It plants and survival is difficult, need to seek other technical methods improvement or creation is suitable for submerged plant and restores habitat.
Microbiological fuel cell (Sediment Microbial Fuel Cell, SMFC) is that have in a kind of degradable bed mud
The based technique for in-situ remediation that machine pollutant produces electricity simultaneously.SMFC by anode produce electricity bacterium aoxidize bed mud in organic matter (electron donor) by
Electronics is generated, cathode is moved to and reacts and consume with oxygen (electron acceptor) so that two electrodes generate potential difference, oxidation
Reduction potential changes.Electricity generation process can influence the microbial mineralization of endogenous ON, endogenous mineralization product NH4 +Migration and nitre
Change-denitrification process.Reduction of these processes for endogenous N, the release potential for reducing endogenous N have a major impact.
Based on the above theory, microbiological fuel cell-submerged plant coupled system can fully combine submerged plant and micro- life
Influence of the object fuel cell to bed mud, Dissolved Oxygen in Water, oxidation-reduction potential promotes the enrichment of denitrification functions microorganism, in situ
Bed mud nitrogen concentration is cut down, body eutrophication is effectively inhibited.
Invention content
The purpose of the invention is to provide a kind of eutrophy is cut down using submerged plant coupling microbiological fuel cell
Change the method for water body endogenous nitrogen, method is simple and practicable, simple operation, and the oxygen discharged using raw electronics and root system is to bed mud
The change of oxidation-reduction potential so that substrate changes from reducing environment to oxidation environment, the nitre for promoting ammonia nitrogen to change to nitrate nitrogen
Change reaction, becoming gaseous nitrogen eventually by denitrification process removes water body, significantly reduces substrate sludge nitrogen nutrient concentration.
Another object of the present invention is to be the provision of a kind of utilization submerged plant coupling microbiological fuel cell reduction
The device of eutrophication water endogenous nitrogen, it is simple in structure, it is easy to assembly, significantly improve eutrophic water body water quality.
In order to achieve the above purpose, the present invention uses following technical measures：
By effective collaboration of microbiological fuel cell and submerged plant, bed mud oxidation-reduction potential and bed mud-are improved
Water termination oxidated layer thickness is enriched with electricity production and the denitrogenation correlation function bacterium of stable structure in electrode surface and submerged plant rhizosphere
Group promotes absorption of the submerged plant to nitrogen, strengthens the reduction of bed mud and Water.
Technical solution：By filling anode plate in submerged plant-Sediment System near root system of plant, in bed mud, in water-
Cathode plate is arranged in air surface, and cathode and anode is connected with external resistance by conducting wire, forms microbiological fuel cell-submerged plant
Coupled system configuration is further changed by oxidation-reduction potential in bed mud, and pH, dissolved oxygen etc. and the migration of different shape nitrogen turn
Change the enrichment of relevant parameter and electricity production and denitrification functions flora, strengthens the nitrogen cut down in bed mud and water body.
A method of eutrophication water endogenous nitrogen being cut down using microbiological fuel cell-submerged plant, steps are as follows：
A, planting submerged plant is planted in eutrophic water deposit；
B, it is buried (at root week diameter 5-10cm) at 3cm-10cm, near submerged plant root system under sediment layer-water termination
Anode plate；
C, cathode plate is set at water-air interface so that cathode material is suspended in the water surface, and cathode plate must have
The area exposure of 30%-50% is in air；
D, anode plate and cathode plate conducting wire and external resistance are connected, forms current loop.Nearby (10 centimetres of anode
Within any distance) be progressively enriched with a large amount of electricity production floras and denitrification functions flora etc., submerged plant rhizosphere is also enriched phase
Denitrogenation flora is closed, the nitrogen cut down in bed mud can be strengthened.
It is therein that the submerged plant is that eel grass, hornwort, watermifoil, black algae, water caltrop, comb tooth bog pondweed, edible seaweed are spent etc.
A kind of or one to seven kind of arbitrary combination.
The anode material includes：Graphite felt, graphite cake, carbon felt, stainless (steel) wire, stainless steel plate etc. are one such.
The cathode material includes：Graphite felt, carbon felt piece etc. are one such.
The cathode plate is graphite felt or carbon felt piece.
The conducting wire is copper wire conducting wire or titanium silk conducting wire.
The external resistance is 50-2000 ohm of adjustable resistance or fixed resistance value resistance or electrical appliance, can market purchase.
In the technical measures of aforementioned four step, it is important to step B and C.In step B, anode plate is arranged in mud-water termination
At lower 3-10cm and near submerged plant root system, this is because the root length of submerged plant is generally in 3-10cm, anode
Near root system, it can preferably be enriched with electricity production flora, denitrification functions flora of stable structure etc..In step C, it need to ensure
The minus plate area of 30%-50% is exposed in air, is in order to which the biological-cathode of formation exists simultaneously oxygen (O2) and nitric acid
Salt nitrogen (NO3 -) it is used as electron acceptor.Due to O2Standard electrode EMF it is higher, can preferentially be used as electron acceptor, receive from anode
The electronics come through outer conductor transmission, so that it is guaranteed that certain efficiency of fuel cell generation；NO simultaneously3When being used as electron acceptor, N can be changed into2
It is removed from water body.
By above method step, oxidation-reduction potential in bed mud can because root system of plant oxygen release and the electricity production of electricity production bacterium and
Electronics transfer and improve so that root zone and anode are formed about the environment of aerobic, anoxic, anaerobism, be conducive to denitrification functions bacterium
The enrichment of group, while plant root exudation organic matter is also conducive to the enrichment of electricity production bacterium.Organic nitrogen in S & W body is by mine
Change, further ammonia nitrogen is converted to nitrate nitrogen, reduces the murder by poisoning to submerged plant, directly absorbs nitre state conducive to submerged plant
Nitrogen is used for own growth (N content can increase by 60% or more in plant), and the initial stage for being conducive to submerged plant restores.
A kind of device for cutting down eutrophication water endogenous nitrogen using submerged plant coupling microbiological fuel cell, the device
It is made of from bottom to top sediment layer, anode plate, submerged plant, overlying water layer, cathode plate, connecting wire and external resistance, feature
It is：Submerged plant takes root in bed mud, and anode plate middle part trepanning passes through submerged plant plant, is located at 3- under mud-water termination
At 10cm, overlying water layer is in mud-water termination, and cathode plate is suspended at overlying water layer-Air Interface and cathode plate must have
The area of 30%-50% is exposed in air；One end of outer conductor is connect with anode plate, the other end of outer conductor respectively with dispatch from foreign news agency
Resistance, cathode plate are connected.Anode plate connect to form current path with cathode plate by connecting wire, external resistance (or electrical appliance).
The bed mud layer thickness is 10-30cm.
The submerged plant be eel grass, hornwort, watermifoil, black algae, water caltrop, comb tooth bog pondweed, edible seaweed spend etc. it is a kind of or
One to seven kind of arbitrary combination.
The anode material includes：Graphite felt, graphite cake, carbon felt, stainless (steel) wire, stainless steel plate etc. are one such.
The cathode material includes：Graphite felt, carbon felt piece etc. are one such.
The conducting wire is copper wire conducting wire or titanium silk conducting wire.
The external resistance is 50-2000 ohm of adjustable resistance or fixed resistance value resistance or electrical appliance, can market purchase.
The overlying water layer height is 45-100cm.
It is crucial that the area of the burial place of anode plate and cathode plate being exposed in air in above-mentioned apparatus.Sun
Pole plate needs under water/sediment interface at 3-10cm and near submerged plant root system, preferably anode could be utilized to produce electricity bacterium
With the synergistic effect of submerged plant root system, promote root zone and the anode enrichment electricity production that abundance is more, structure is more stable and denitrogenation work(
Energy flora etc..And cathode plate is exposed to the area requirements of air while be in order to ensure certain efficiency of fuel cell generation so that part
Nitrate is used as electron acceptor and is changed into N2It is removed from water body.
After the device, NH in overlying water4 +Content has dropped 67% or more, NO3 -/ TN ratios are then increased to from 85%
95%, submerged plant absorbs the NO of 20-30%3 -, TN contents decline 20% or more, wherein surface layer (0-5cm) bed mud in bed mud
Middle NH4 +Content declines 50% or more, NO3 -Content declines 60% or more, while anode plate is enriched bacillus
(Bacillus) and the denitrifying bacteriums such as pseudomonas (Pseudomonas), denitrification stronger near anode region is illustrated
Effect.
The present invention compared with prior art, has the following advantages that and effect：
1, the present invention passes through simple submerged plant planting, electrode in the higher eutrophication water of bed mud nitrogen content
Setting is connected with conducting wire, is made full use of submerged plant photosynthesis, electricity-producing microorganism to generate electronics and is transmitted to electrode, increases
The aerobic layer thickness of bed mud-water termination so that the alternate environment that aerobic-anaerobic-anaerobism is formed in bed mud, water body, in bed mud rhizosphere
It is enriched with electricity production and denitrification functions flora with electrode surface, to strengthen the reduction of eutrophication water endogenous nitrogen.
2, microbiological fuel cell-submerged plant collaboration drop nitrogen system and single deposit Microbial fuel electricity in the present invention
Pond is compared, and the radial direction that oxygen to root system and root system are conveyed using the photosynthesis blade oxygen release of submerged plant, aerating tissue is secreted
Oxygen has built aerobic plant rhizosphere, anoxic, the microenvironment of anaerobism, is conducive to the generation of nitrification, anti-nitration reaction.Meanwhile heavy water is planted
The organic matter of object photosynthesis root system secretion can be used as denitrifying carbon source, promote denitrification denitrogenation.
3, microbiological fuel cell-submerged plant collaboration drops nitrogen system compared with single cropping submerged plant in the present invention,
Electron transfer in electricity generation process is conducive to the conversion of different shape nitrogen, and the suction of nitrogen can be utilized by promoting submerged plant plant pair
It receives；The electricity production bacterium of Sync enrichment on the electrode promotes the growth of denitrification functions flora.
Description of the drawings
Fig. 1 is a kind of side cutting down eutrophication water endogenous nitrogen using deposit microbiological fuel cell-submerged plant
Method and schematic device.
Wherein, 1- sediment layers；2- anode plates；3- submerged plants；4- overlying water layers；5- cathode plates；6- outer conductors；7- dispatches from foreign news agency
Resistance (common, market is purchased).
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 method of cutting down eutrophication water endogenous nitrogen, step using microbiological fuel cell coupling submerged plant
It is as follows：
A, planting submerged plant is planted in eutrophic water sedimentary layer；Oxygen is discharged using submerged plant root system, forms root
The microenvironment of border periphery aerobic-anaerobic-anaerobism, be conducive to nitration denitrification process generation, while submerged plant root system secretion
Organic matter can be used as denitrifying carbon source, cannot be smoothed out with making up in denitrification process since carbon source lacks.
B, (the root week diameter 5 or 7 or 8 or 10cm under sediment layer-water termination at 3cm-10cm, near submerged plant root system
Place) bury anode plate；Since the nitrogen in surface deposit is easiest to that Forms Transformation occurs and is discharged into overlying water layer, and sink
For the root length of water plant generally in 3-10cm, anode plate can preferably be enriched with the electricity production bacterium of stable structure near root system
Group, denitrogenation flora etc. are conducive to cooperate with electricity production effect with what plant root zone acted on.
C, cathode plate is set at water-air interface so that cathode material is suspended in the water surface, and cathode plate must have
The area exposure of 30%-50% (in this range inner area) is in air；Exposed area require be ensure it is certain
While efficiency of fuel cell generation so that part nitrate is used as electron acceptor and is changed into N2It is removed from water body.
D, anode plate and cathode plate conducting wire and resistance are connected, forms current loop.Anode nearby (10 centimetres with
Interior any distance) a large amount of electricity production floras and denitrification functions flora etc. are progressively enriched with, submerged plant rhizosphere is also enriched correlation
Denitrogenation flora can strengthen the nitrogen cut down in bed mud.
The submerged plant includes：Eel grass, hornwort, watermifoil, black algae, water caltrop, edible seaweed flower, comb tooth bog pondweed etc. one
Kind or one to seven kind of arbitrary combination.
The anode plate is the electrode plate of trepanning in the form of an array, and electrode sheet material is to include：Graphite felt, carbon felt, no
Rust steel plate, stainless (steel) wire etc. are therein any.
The cathode plate is graphite felt or carbon felt piece.
The conducting wire is copper wire conducting wire or titanium silk conducting wire.
The external resistance is 50-2000 ohm of adjustable resistance or fixed resistance value resistance or electrical appliance, can market purchase.
The experimental results showed that：After the method in the present invention, former eutrophic water sedimentary layer, mud-water termination (gap
Water), the TN contents in overlying water layer decline, decline 24.02%, 31.56% and 9.03% respectively, N content increases in plant
Add 57.76%；DO concentration increases to 4.05mg/L from 2.41 in overlying water, and corresponding pH rises to 8.66 from 7.93.Anode
Electrode surface there are bacillus (Bacillus), pseudomonas (Pseudomonas), the thin end of the scroll Pseudomonas (Geobacter),
The enrichment for nitrifying the denitrogenations Pseudomonas such as spiral Pseudomonas (Nitrospira) illustrates that electricity production promotes the nitre of bed mud to a certain extent
Change, denitrification process；Electricity production also promotes absorption of the submerged plant to nitrogen.In turn, plant also promotes the thin end of the scroll Pseudomonas
(Geobacter) and the enrichment of the electricity production bacterium such as Bacteroides (Bacteroides), plant root exudation organic matter is as denitrification
Carbon source promotes bed mud denitrification denitrogenation.
In 1 submerged plant body of table, deposit, water and interface total nitrogen content
Embodiment 2：
A kind of device for cutting down eutrophication water endogenous nitrogen using microbiological fuel cell coupling submerged plant, the device
It is equipped with sediment layer 1, anode plate 2, submerged plant 3, overlying water layer 4, cathode plate 5, outer conductor 6, external resistance 7 from bottom to top.Its
It is characterized in that：Anode plate 2 is located at 3 or 5 or 8 or 10cm under 1 surface layer of bed mud, and the root of submerged plant 3 passes through the tapping of anode plate 2
And prick into bed mud 1, cathode plate 5 is suspended in overlying water layer 4 and 30%-50% (in this range inner area) area is sudden and violent
In air, one end of outer conductor 6 is connect dew with anode plate 2, the other end of outer conductor 6 respectively with external resistance 7,5 phase of cathode plate
Even.
1 thickness of the sediment layer is 10 or 15 or 22 or 27 or 30cm, is the water such as lake, river, the irrigation canals and ditches of eutrophication
Bed mud in body.
The anode plate 2 is the electrode plate of trepanning in the form of an array.
2 material of anode plate includes that graphite felt, graphite cake, carbon felt, stainless (steel) wire, stainless steel plate etc. are therein any
Kind.
The submerged plant 3 be eel grass, hornwort, watermifoil, black algae, water caltrop, comb tooth bog pondweed, edible seaweed spend etc. it is a kind of or
One to seven kind of arbitrary combination.
4 height of overlying water layer is 45 or 56 or 64 or 78 or 85 or 94 or 100cm, is lake, the river of eutrophication
Water in road, irrigation canals and ditches.
5 material of cathode plate includes that graphite felt, carbon felt piece etc. are one such.
The outer conductor 6 is copper wire conducting wire or titanium silk conducting wire.
The external resistance 7 is 50-2000 ohm of adjustable resistance or fixed resistance value resistance or electrical appliance, can market purchase
It sets.
The experimental results showed that：After being run 34 days using the device in the present invention, total nitrogen contains in overlying water, Interstitial Water, bed mud
Amount reduces (table 2, table 3).NH in overlying water4 +Concentration drops to 0.07mg/L, NO from 0.23mg/L3 -Concentration does not change then,
NO3 -Shared TN ratios are then increased to 95% from 85%.Interstitial Water upper layer (0-5cm), middle level (5-10cm), lower layer (10-15cm)
In NH4 +Decline with ON concentration, and NO3 -Concentration rises, and shared TN ratios are followed successively by 20.4%, 13.72% and
65.4%.ON, NH in bed mud4 +、NO3 -Content is reduced.
Various nitrogen forms changes of contents in 2 overlying water of table and Interstitial Water (upper, middle and lower layer)
3 bed mud of table (upper (0-5cm), in various nitrogen forms changes of contents in (5-10cm, under (10-15cm)) layer
Embodiment 3：
Experiment compares M-SMFC systems and SMFC systems and is cut to nitrogen in bed mud and overlying water under same environmental conditions
The effect subtracted, as a result shows：
1) M-SMFC groups achieve strongest endogenous ON mineralisings so that the TN contents in bed mud and overlying water are smaller.
The electricity generation process of SMFC groups promotes the organic nitrogen in bed mud and is converted to ammonia nitrogen, and mineralized nitrogen is at nitrate nitrogen, nitric acid in bed mud
Salt accumulates, and ammonia nitrogen reduces.And submerged plant (is shown in Table in vivo in addition to absorbing ammonia nitrogen enrichment in bed mud and overlying water in M-SMFC groups
4,32.2%) nitrogen content is relatively higher by eel grass body, also further promotes nitrification by photosynthesis of plant oxygen release.
2) SMFC promotes the removal of endogenous TN, but electricity generation process causes the alkalization of overlying water layer and sediment layer acidification,
Endogenous NH is made4 +It discharges and volatilizees to overlying water, with the increase of overlying water DO, nitrification enhancing causes overlying water
NO3 -Accumulation.Meanwhile mud caused by electricity generation process-thickening for water termination oxide layer inhibits NO3 -In the anti-nitre of mud-water termination
Change, there is also NO in Interstitial Water3 -Accumulation.The denitrifications such as electricity generation process Anodic electrode surface Bacillus and Pseudomonas
The enrichment of bacterium, the reduction of the nitrobacterias abundance such as Nitrospira explain the denitrification process that electricity production promotes bed mud.
3) accumulation of overlying water N is significantly inhibited in M-SMFC groups, because root system of plant acts on the upper layer of bed mud in
Layer plays significant N removals effect, and submerged plant promotes the electricity production bacterium such as anode surface Geobacter and Bacteroides
The organic matter of enrichment, the secretion of side light submerged plant root system can provide denitrifying carbon source, promote deposit denitrification.
4) SMFC and submerged plant eel grass are complementary on the TN of removal upper layer and lower layer's bed mud.M-SMFC systems, which are held, to be overcome
Single SMFC is protected always by the acidification of electricity production anode, the defect that cathodic region alkalization is influenced and the submerged plant growth later stage decays
Higher TN is held to cut down.
Table 4 tests nitrogen content (mean value) in front and back biomass of submerged plant and plant
Claims (7)
1. a kind of method for cutting down eutrophication water endogenous nitrogen using microbiological fuel cell-submerged plant, step are：
A, planting submerged plant is planted in eutrophic water deposit；
B, anode plate is buried at 3cm-10cm, near submerged plant root system under sediment layer-water termination；
C, cathode plate is set at water-air interface so that cathode material is suspended in the water surface, and cathode plate has the face of 30%-50%
Product exposure is in air；
D, anode plate and cathode plate conducting wire and external resistance are connected, forms current loop；
The submerged plant be eel grass, hornwort, watermifoil, black algae, water caltrop, comb tooth bog pondweed, edible seaweed spend it is one such or
One to seven kind of arbitrary combination.
The anode material includes：Graphite felt, graphite cake, carbon felt, stainless (steel) wire, stainless steel plate are one such.
The cathode material includes：Graphite felt, carbon felt piece are one such.
The cathode plate is graphite felt or carbon felt piece；
The conducting wire is copper wire conducting wire or titanium silk conducting wire；
The external resistance is 50-2000 ohm of adjustable resistance or fixed resistance value resistance or electrical appliance.
2. a kind of utilization microbiological fuel cell coupling submerged plant described in claim 1 cuts down eutrophication water endogenous nitrogen
Device, the device is by sediment layer (1), anode plate (2), submerged plant (3), overlying water layer (4), cathode plate (5), outer conductor
(6), external resistance (7) forms, it is characterised in that：Anode plate (2) is located at 3-10cm under bed mud (1) surface layer, submerged plant (3)
Root passes through the tapping of anode plate (2) to prick into bed mud (1), and cathode plate (5) is suspended in overlying water layer (4) and 30%-50%
Area exposes in air, and one end of outer conductor (6) is connect with anode plate (2), the other end of outer conductor (6) respectively with external resistance
(7), cathode plate (5) is connected.
3. according to claim 2 a kind of using in microbiological fuel cell coupling submerged plant reduction eutrophic water body
The device of source nitrogen, it is characterised in that：Described sediment layer (1) thickness is 10-30cm, is the lake, river, irrigation canals and ditches of eutrophication
Bed mud in water body.
4. according to claim 2 a kind of using in microbiological fuel cell coupling submerged plant reduction eutrophic water body
The device of source nitrogen, it is characterised in that：The anode plate (2) is the electrode plate of trepanning in the form of an array, and anode plate (2) includes stone
Black felt, graphite cake, carbon felt, stainless (steel) wire, stainless steel plate are therein any.
5. according to claim 2 a kind of using in microbiological fuel cell coupling submerged plant reduction eutrophic water body
The device of source nitrogen, it is characterised in that：The submerged plant (3) is eel grass, hornwort, watermifoil, black algae, water caltrop, comb tooth eye
Sub- dish, edible seaweed spend a kind of or one to seven kind arbitrary combination.
6. according to claim 2 a kind of using in microbiological fuel cell coupling submerged plant reduction eutrophic water body
The device of source nitrogen, it is characterised in that：The overlying water layer (4) is highly 45-100cm, be the lake of eutrophication, river,
Water in irrigation canals and ditches.
7. according to claim 2 a kind of using in microbiological fuel cell coupling submerged plant reduction eutrophic water body
The device of source nitrogen, it is characterised in that：The cathode plate (5) includes that graphite felt, carbon felt piece are one such.
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