CN105541046A - Synchronous electricity generation and sewage purification device utilizing steel slag as positive electrode - Google Patents

Synchronous electricity generation and sewage purification device utilizing steel slag as positive electrode Download PDF

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CN105541046A
CN105541046A CN201610063285.2A CN201610063285A CN105541046A CN 105541046 A CN105541046 A CN 105541046A CN 201610063285 A CN201610063285 A CN 201610063285A CN 105541046 A CN105541046 A CN 105541046A
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slag
layer
anode
conducting filler
positive electrode
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CN105541046B (en
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吴振斌
肖恩荣
周银
许丹
武俊梅
徐栋
贺锋
周巧红
张义
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Institute of Hydrobiology of CAS
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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
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F2001/46133—Electrodes characterised by the material
    • 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
    • C02F2003/001—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/33—Wastewater or sewage treatment systems using renewable energies using wind energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy

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  • Biological Treatment Of Waste Water (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

The invention discloses a synchronous electricity generation and sewage purification device utilizing steel slag as a positive electrode. The steel slag utilized as positive electrode filler for a battery is embedded into a vertical flow artificial wetland system, so that a novel structure method with a microbial fuel cell and a constructed wetland which are coupled is formed. A bottom non-conductive filler layer, a steel slag positive electrode layer, a current collector inserted into the steel slag positive electrode layer, a top non-conductive filler layer, wetland plants planted in the non-conductive filler layers and a top negative electrode layer are laid on the system from bottom to top, wherein the negative electrode layer and the positive electrode layer are respectively connected with a resistor box through wires so as to form a closed loop. The steel slag electrode is embedded into a positive electrode of the microbial fuel cell and meanwhile coupled with the vertical current constructed wetland, so that dual effects of synchronous electricity generation and sewage purification are realized, the positive electrode teleportation efficiency is improved, the internal resistance of the battery is reduced, the electricity generation performance is improved, and meanwhile the water acidification problem is solved.

Description

A kind of take slag as the synchronous electrogenesis of anode and the device of sewage purification
Technical field
The invention belongs to sewage treatment area, being specifically related to a kind of take slag as the synchronous electrogenesis of anode and the device of sewage purification, and being coupled with microbiological fuel cell by vertical current constructed wetland realizes electrogenesis and sewage purification.
Background technology
Energy dilemma and environmental pollution and consequent society, Climatic issues etc. have become the focus that the whole world is paid close attention to.With " minimizing, resource utilization and recycling " for principle development clean energy and recycling economy, it is the important channel building a resource-conserving and environment-friendly society and realize Sustainable development.Developing, utilizing based on the clean energy of sun power, nuclear energy, wind energy, biomass energy is alternative traditional energy, solves the inevitable choice of energy dilemma, the strategic requirement of Ye Shi China future source of energy development.
Artificial swamp (ConstructedWetland, CW) be strengthening on natural imitation ecosystem basis and transformation, ornamental hydrophyte under different natural condition is utilized to carry out the sewage purification system of group's space and time optimization, closest to one of natural artificial ecosystem (Wu Zhenbin, composite vertical current artificial wetland, Science Press, Beijing, 2008).There is the features such as efficiency is high, cost is low, operational management is simple, be widely used in the control of sanitary sewage, Rural Plane Source Pollution and lake pollution.
Microbiological fuel cell (Microbialfuelcell, MFC) is the device utilizing microbe-catalytic oxidization organism and inorganics and produce electric energy, may be used for wastewater treatment, and it is low to consume energy, becomes the study hotspot of environmental area in recent years.
Artificial swamp realizes integrated combination with microbiological fuel cell by wetland plant, microorganism, matrix, electrode, form the coupled system of artificial swamp-microbiological fuel cell (CW-MFC), utilize wetland plant photosynthesis conversion solar can be electric energy, electric energy can be reclaimed while purifying waste water, to distributing be become continue a kind of new model of renewable energy power generation, there is good development prospect.
At present, the research about CW-MFC coupled system is at the early-stage, and wherein the research of electrode has great significance for reduction running cost, raising power density and purification of water quality usefulness.Good electrode configuration needs, for microorganism provides as far as possible large bond area, to realize effective electron collection simultaneously.The electrode materials be used in CW-MFC system mainly contains graphite felt, graphite cake, granulated active carbon (GAC), stainless steel graticule mesh and carbon cloth now.Wherein GAC is considered to the anode material of optimum as plant electrogenesis system, its particle diameter is little, surface irregularity, electrogenesis and the more excellent (ArendsJ.B.A. of sewage purification performance, londeelV., TennisonS.R., BoonN., VerstraeteW., Suitabilityofgranularcarbonasananodematerialforsedimentm icrobialfuelcells, inJournalofSoilsandSediment, 2012, pp.1197-1206.), but, the price of this material is relatively high, and practicality is not high.
Slag, a kind of industrial solid wastes, output is about the 15%-20% of crude steel output.Slag is primarily of the oxide compound composition of calcium, iron, silicon, magnesium and a small amount of aluminium, manganese, phosphorus etc.The Solid solution that main mineral facies are tricalcium silicate, Dicalcium Phosphate (Feed Grade), monticellite, calcium manganolite, calcium aluminoferrite and silicon, the oxide compound of magnesium, iron, manganese, phosphorus is formed, also containing a small amount of free calcium oxide and metallic iron, fluorapatite etc., possesses larger phosphorus loading capacity in theory.The research that current slag is used as CW-MFC system anode material there is no report both at home and abroad.
Summary of the invention
The object of the invention is to there are provided a kind of take slag as the synchronous electrogenesis of anode and the device of sewage purification, slag electrode landfill is coupled with vertical current constructed wetland to anode of microbial fuel cell simultaneously, realize the double utility of synchronous electrogenesis and sewage purification, improve anode current transmission efficiency, reduce the internal resistance of cell, improve electricity generation performance.
For achieving the above object, the present invention adopts following technical measures:
Technical scheme: core of the present invention is based on vertical current constructed wetland structure, by landfill slag anode layer, biological-cathode layer, define the novel texture method that microbiological fuel cell and artificial swamp are coupled, the method is passed through using slag as galvanic anode, improve anode current transmission efficiency, reduce the internal resistance of cell, thus improve the electricity generation performance of CW-MFC system; On the other hand, by the absorption of slag to phosphor in sewage, and matrix, microorganism, root system of plant to the cleaning action of other pollutents, the sewage purification ability of CW-MFC system can be strengthened.
A kind of take slag as the synchronous electrogenesis of anode and the device of sewage purification, comprise bottom non-conducting filler layer, slag anode layer, current collector, top non-conducting filler layer, cathode layer, wire, resistance box and wetland plant, bottom non-conducting filler layer is set gradually from bottom to up in vertical current constructed wetland, slag anode layer, top non-conducting filler layer and cathode layer, current collector is buried underground in slag anode layer, current collector and cathode layer connect to form loop line respectively by wire and resistance box, wetland plant is planted in the non-conducting filler layer of top through cathode layer, described bottom non-conducting filler layer thickness is 3-20cm, slag anode layer thickness is 5-25cm, top non-conducting filler layer thickness is 10-30cm, cathode electrode layer thickness is 3-15cm, and in described slag anode layer, current collector is stainless steel graticule mesh or graphite carbon rod.
In described bottom non-conducting filler layer and top non-conducting filler layer, filler is the arbitrary combination of in gravel, zeolite, hard coal, biological ceramic particle and quartz sand a kind or 2 to 5 kinds, and particle diameter is 0.5-10mm.
Described wetland plant is the arbitrary combination of in Spiked Loosestrife, cyperus alternifolius, wild rice stem, Canna generalis Bailey, the sweet thatch of water, Value of Spartina Anglica, Arundinella hirta (Thunb.) Tanaka, calamus, reed, napier grass, floral leaf Lu Di and iris a kind or 2 to 12 kinds.
In described slag anode layer, filler is discarded slag, in converter slag, open hearth slag, electric furnace slag any one; Slag particle diameter is 1-8mm, and tamped density is 0.35-0.65g/cm 3.
In described cathode layer, electro-conductive material is any one in graphite granule, activated carbon granule, graphite felt, stainless steel; wherein with graphite granule or activated carbon granule for negative electrode filler time; particle diameter is 1-5mm, will insert current collector stainless (steel) wire or graphite carbon rod simultaneously.
Taking slag as the synchronous electrogenesis of anode and the process of sewage purification water is:
A, sewage are first at bottom even water distribution (comprising micro-polluted surface water, Polluted Groundwater and sanitary sewage), and be that pulling flow type rises along bottom non-conducting filler layer, due to absorption, the crown_interception of matrix, and the metabolism of microorganism in matrix, in sewage, partial organic substances and suspended substance are removed efficiently, and TN and TP also part is trapped;
B, upwards flow through slag anode layer through the sewage of steps A, the electrogenesis bacterium that organism in sewage and the organism of plant root exudation are attached on slag utilizes, release electronics, in slag, metal oxide is as mesosome, help electronics to be fast and effeciently delivered to anode surface to be collected by current collector, be delivered on external circuit, arrive cathode layer finally by outer meeting resistance case and form loop line, produce electric energy.In this process, dirty Organic substance in water is consumed in a large number, and phosphorus reduces greatly due to the physical adsorption of slag, chemisorption and precipitating action content, ammonia nitrogen due to metallic cation generation cationic exchange effect in slag, be also partially removed;
C, flow into top non-conducting filler layer through the sewage of step B, the root system of wetland plant is dispersed in this hypothallus.Due to effects such as the absorption and sorptions of root system of plant in this process, the absorption of matrix, crown_interception, and the metabolism of microorganism in matrix, in pollutent, organism, TN, TP are removed further;
D, finally flow into upper cathode layer through the sewage of step C, due to employing is air biological-cathode, negative electrode and be attached to the microorganism around negative electrode acting in conjunction under, in sewage, remaining organism and nitrogen, phosphorus are removed further, purification after sewage through rising pipe bleeder.
The present invention compared with prior art, has following advantage and effect:
(1) discarded slag recycling.Adopt slag as galvanic anode filler in the present invention, discarded slag is utilized effectively.
(2) reduce costs.Compared with the electrodes such as in the present invention, CW-MFC coupled system is on the basis realizing synchronous electrogenesis and sewage disposal, the granulated active carbon (GAC) commonly used with traditional CW-MFC system, greatly reduce the cost of battery.Compared with the customary filler sandstone, hard coal etc. of artificial swamp, also greatly reduce the running cost of system.
(3) strengthen electrogenesis flora transmission efficiency, improve electrogenesis usefulness.The electrochemical activity microorganism of MFC anode is formed primarily of alienation metal reducing miroorganisms.The outer cytochrome C of born of the same parents of metal oxide and alienation metal reducing miroorganisms has high affinity, can be reduced, with metal ion or its oxide compound (Mn as electron acceptor(EA) 2+, Ni 2+, Fe 3o 4, Ni 2+deng) electrode is modified, can significantly improve the working efficiency of electrode, slag itself has stronger electroconductibility, and particle diameter is less, surface irregularity, and is rich in the metal oxide such as iron, manganese in slag, Fe 3o 4as mesosome, electronics can be improved from electrogenesis bacterium to the transmission efficiency of anode surface Deng metal oxide, reduce ohmic internal resistance and the polarization resistance of anode, thus improve the electrogenesis usefulness of CW-MFC system.
(4) better to the absorption property of phosphorus.Slag is as the filling substrate of artificial swamp, better to the removal effect of phosphorus, average removal rate can up to 91.9%, slag exists except physical adsorption except self to phosphorus element, the metal ion such as calcium ion, aluminum ion in self mineral composition composition can with phosphate from sewage generation chemical reaction, there is precipitating action further.
(5) there is water outlet easily in alkaline problem as a kind of potential wet land filler in slag itself, and in MFC operational process, along with electronics transfers to negative electrode through external circuit, in order to maintain the ionic concn of anode and negative electrode, only have H +move to negative electrode, or OH -move round about, and except H +positively charged ion in addition or OH -the migration of negatively charged ion in addition can cause accumulation to cause concentration gradient increase, anolyte compartment pH is declined, occurs acidifying problem, slag is used as CW-MFC system anode filler, the positively charged ion be rich in slag can reduce anode and cathode concentration gradient just, solves the problem.
Accompanying drawing explanation
Fig. 1 is a kind of take slag as the synchronous electrogenesis of anode and the apparatus structure schematic diagram of sewage purification.
Wherein, non-conducting filler layer bottom 1-; 2-slag anode layer; 3-current collector; 4-top non-conducting filler layer; 5-wetland plant; 6-cathode layer; 7-wire; 8-resistance box.
Embodiment
Be explained and illustrated below in conjunction with the specific embodiment of accompanying drawing 1 to invention, be not construed as limiting the invention.
embodiment 1:
As shown in Figure 1, a kind of take slag as the synchronous electrogenesis of anode and the device of sewage purification, with columniform pvc pipe (H=70cm, D=15cm) as upward vertical flow artificial swamp, upward vertical flow artificial swamp comprises bottom non-conducting filler layer 1, slag anode layer 2, current collector 3, top non-conducting filler layer 4, cathode layer 6, wire 7, resistance box 8 and wetland plant 5, bottom non-conducting filler layer 1 is set gradually from bottom to up in vertical current constructed wetland, slag anode layer 2, top non-conducting filler layer 4 and cathode layer 6, current collector 3 is buried underground in slag anode layer 2, current collector 3 connects to form loop line with cathode layer 6 respectively by wire 7 and resistance box 8, wetland plant 5 is planted in top non-conducting filler layer 4 through cathode layer 6.Water inlet pipe is arranged on non-conducting filler layer 1 lower end, bottom, and rising pipe is arranged on top cathode layer 6 place.
Fill gravel, laying depth H=20cm in bottom non-conducting filler layer 1, grain size of gravel is 5-10mm; Fill the slag taking from Wuhan Steel Plant in slag anode layer 2, laying depth H=10cm, slag particle diameter is 1-8mm, and tamped density is 0.45g/cm 3; Stainless (steel) wire is inserted as electric current collection 3 in slag; Filled stone sand in top non-conducting filler layer 4, laying depth H=30cm, quartz sand particle size is 0.5-1mm; Wetland plant 5 is Canna generalis Bailey (3 strain); Cathode layer 6 height H=3cm is that electrode materials is laid on quartz sand with graphite felt, makes not have graphite felt into water sewage, graphite felt thickness D=6mm; Resistance box 8 is set to 1000 Europe.
Wherein water inlet is the sanitary sewage of laboratory autogamy, and this sewage is characterized as: COD=500-600mg/L, TN=30-40mg/L, TP=10-15mg/L, pH=7.8.
Sewage is pumped into device from bottom water inlet pipe by peristaltic pump by this system, the flow set of pump is 1.5ml/min, first sewage flow into bottom gravel bed, due to the absorption of gravel matrix, crown_interception, and the metabolism of microorganism in matrix, in sewage, partial organic substances and suspended substance are removed efficiently, TN and TP also part is trapped, sewage flows through slag anode layer subsequently, the electrogenesis bacterium that the organism of the organism in sewage and the secretion of Canna generalis Bailey root system is attached on slag utilizes, release electronics, in slag, metal oxide is as mesosome, help electronics to be fast and effeciently delivered to anode surface to be collected by stainless (steel) wire, be delivered on external circuit, arrive cathode layer finally by outer meeting resistance case and form loop line, produce electric energy.In this process, dirty Organic substance in water is consumed in a large number, and phosphorus reduces greatly due to the physical adsorption of slag, chemisorption and precipitating action content, ammonia nitrogen due to metallic cation generation cationic exchange effect in slag, be also partially removed.Then sewage flows into top quartz sand layer, and due to cleaning action and the matrix absorption crown_interception of Canna generalis Bailey root system, dirty Organic substance in water, nutritive salt are consumed further, and water outlet COD, TN, TP content reduces further.Last sewage flows through graphite felt negative electrode, and dirty Organic substance in water is consumed by the microbial film on graphite felt surface further, and after purification, sewage is through rising pipe bleeder, and hydraulic detention time is 7 days.
Experimental result shows: adopt with slag when being CW-MFC coupled system process the type sewage of anode, electrogenesis power reaches 25.47mW/m 2, the more conventional use activated carbon granule of electrogenesis amount improves 181.0% for during anode.In sewage, COD clearance is that 90.6%, TP clearance reaches 92.9% up to 93.8%, TN clearance, is that matrix is apparently higher than the constructed wetland device being matrix with gravel etc. with slag.The pH of water outlet is simultaneously 8.1, alleviates water outlet to a certain extent easily in alkaline problem.
embodiment 2:
A kind of take slag as the synchronous electrogenesis of anode and the device of sewage purification, with columniform pvc pipe (H=70cm, D=15cm) as upward vertical flow artificial swamp, upward vertical flow artificial swamp comprises bottom non-conducting filler layer 1, slag anode layer 2, top non-conducting filler layer 4, cathode layer 6, wire 7, resistance box 8 and wetland plant 5, bottom non-conducting filler layer 1 is set gradually from bottom to up in vertical current constructed wetland, slag anode layer 2, top non-conducting filler layer 4 and cathode layer 6, current collector 3 is buried underground in slag anode layer 2, current collector 3 connects to form loop line with cathode layer 6 respectively by wire 7 and resistance box 8, wetland plant 5 is planted in top non-conducting filler layer 4 through cathode layer 6, water inlet pipe is arranged on non-conducting filler layer 1 lower end, bottom, rising pipe is arranged on top cathode layer 6 place.
Fill hard coal, laying depth H=3cm in bottom non-conducting filler layer 1, particle diameter is 5-10mm; Fill the slag taking from Wuhan Steel Plant in slag anode layer 2, laying depth H=25cm, slag particle diameter is 1-8mm tamped density is 0.35g/cm 3; Stainless (steel) wire is inserted as current collector 3 in slag; Filled stone sand in top non-conducting filler layer 4, laying depth H=10cm, quartz sand particle size is 0.5-1mm; Wetland plant 5 is cyperus alternifolius (3 strain), and cathode layer 6 height H=15cm is that electrode materials is laid on quartz sand with graphite felt, makes not have graphite felt into water sewage, graphite felt thickness D=6mm; Resistance box 8 is set to 1000 Europe.
Water inlet is Wuhan eutrophication pond water, and the type water pollutant is characterized as: COD=50 ~ 60mg/L, TN=2 ~ 3mg/L, TP=0.5 ~ 4mg/L, pH=7.5.
Sewage is pumped into device from bottom water inlet pipe by peristaltic pump by this system, the flow set of pump is 1.5ml/min, first sewage flow into bottom gravel bed, due to the absorption of gravel matrix, crown_interception, and the metabolism of microorganism in matrix, in sewage, partial organic substances and suspended substance are removed efficiently, TN and TP also part is trapped, sewage flows through slag anode layer subsequently, the electrogenesis bacterium that the organism of the organism in sewage and the secretion of cyperus alternifolius root system is attached on slag utilizes, release electronics, in slag, metal oxide is as mesosome, help electronics to be fast and effeciently delivered to anode surface to be collected by stainless (steel) wire, be delivered on external circuit, arrive cathode layer finally by outer meeting resistance case and form loop line, produce electric energy.In this process, dirty Organic substance in water is consumed in a large number, and phosphorus reduces greatly due to the physical adsorption of slag, chemisorption and precipitating action content, ammonia nitrogen due to metallic cation generation cationic exchange effect in slag, be also partially removed.Then sewage flows into top quartz sand layer, and due to cleaning action and the matrix absorption crown_interception of cyperus alternifolius root system, dirty Organic substance in water, nutritive salt are consumed further, and water outlet COD, TN, TP content reduces further.Last sewage flows through graphite felt negative electrode, and dirty Organic substance in water is consumed by the microbial film on graphite felt surface further, and after purification, sewage is through rising pipe bleeder, and hydraulic detention time is 7 days.
Experimental result shows: adopt with slag when being CW-MFC coupled system process the type sewage of anode, electrogenesis power reaches 21.8mW/m 2, the more conventional use activated carbon granule of electrogenesis amount improves 140.9% for during anode.In sewage, COD clearance is that 88.5%, TP clearance reaches 94.3% up to 95.8%, TN clearance, is that matrix is apparently higher than the constructed wetland device being matrix with gravel etc. with slag.The pH of water outlet is simultaneously 7.9, alleviates water outlet to a certain extent easily in alkaline problem.
embodiment 3:
A kind of take slag as the synchronous electrogenesis of anode and the device of sewage purification, with columniform pvc pipe (H=70cm, D=15cm) as upward vertical flow artificial swamp, upward vertical flow artificial swamp comprises bottom non-conducting filler layer 1, slag anode layer 2, top non-conducting filler layer 4, cathode layer 6, wire 7, resistance box 8 and wetland plant 5, bottom non-conducting filler layer 1 is set gradually from bottom to up in vertical current constructed wetland, slag anode layer 2, top non-conducting filler layer 4 and cathode layer 6, current collector 3 is buried underground in slag anode layer 2, current collector 3 connects to form loop line with cathode layer 6 respectively by wire 7 and resistance box 8, wetland plant 5 is planted in top non-conducting filler layer 4 through cathode layer 6, water inlet pipe is arranged on non-conducting filler layer 1 lower end, bottom, rising pipe is arranged on top cathode layer 6 place.
Fill zeolite, laying depth H=15cm in bottom non-conducting filler layer 1, the particle diameter of zeolite is 6mm-10mm; Fill the converter of taking from Wuhan Steel Plant in slag anode layer 2 and discard slag, laying depth H=10cm, slag particle diameter is 1mm-7mm, and tamped density is 0.65g/cm 3; Graphite carbon rod is inserted as current collector 3 in slag; Filled biomass pottery and hard coal in top non-conducting filler layer 4, laying depth H=20cm, biological ceramics and hard coal separately accounting are 2:1, and biological ceramics particle diameter is 0.5mm, and anthracite granule size is 1mm; Wetland plant 5 is reed (3 strain), and cathode layer 6 take activated carbon granule as filler, laying depth D=10cm, and particle diameter is 1mm-5mm, inserts graphite carbon rod as current collector in activated carbon granule; Resistance box 8 is set to 1000 Europe.
Wherein water inlet is the sanitary sewage of laboratory autogamy, and this sewage is characterized as: COD=500 ~ 600mg/L, TN=30 ~ 40mg/L, TP=10 ~ 15mg/L, pH=7.8.
Sewage is pumped into device from bottom water inlet pipe by peristaltic pump by this system, the flow set of pump is 1.5ml/min, first sewage flow into bottom zeolite layer, due to the absorption of zeolite matrix, crown_interception, and the metabolism of microorganism in matrix, in sewage, partial organic substances and suspended substance are removed efficiently, TN and TP also part is trapped, sewage flows through slag anode layer subsequently, the electrogenesis bacterium that the organism of the organism in sewage and the secretion of reed root system is attached on slag utilizes, release electronics, in slag, metal oxide is as mesosome, help electronics to be fast and effeciently delivered to anode surface to be collected by graphite carbon rod, be delivered on external circuit, arrive cathode layer finally by outer meeting resistance case and form loop line, produce electric energy.In this process, dirty Organic substance in water is consumed in a large number, and phosphorus reduces greatly due to the physical adsorption of slag, chemisorption and precipitating action content, ammonia nitrogen due to metallic cation generation cationic exchange effect in slag, be also partially removed.Then sewage flows into top quartz sand layer, and due to cleaning action and the matrix absorption crown_interception of reed root system, dirty Organic substance in water, nutritive salt are consumed further, and water outlet COD, TN, TP content reduces further.Last effluent stream crosses gac particulate cathodic, activated carbon granule specific surface area is large, and large to the absorption crown_interception of pollutent, dirty Organic substance in water can be consumed further by the microbial film of activated carbon surface simultaneously, sewage after purification is through rising pipe bleeder, and hydraulic detention time is 7 days.
Experimental result shows: adopt with slag when being CW-MFC coupled system process the type sewage of anode, electrogenesis power reaches 26.13mW/m 2, the more conventional use activated carbon granule of electrogenesis amount improves 188.3% for during anode.In sewage, COD clearance is that 91.5%, TP clearance reaches 93.3% up to 94.1%, TN clearance, is that matrix is apparently higher than the constructed wetland device being matrix with gravel etc. with slag.The pH of water outlet is simultaneously 8.1, alleviates water outlet to a certain extent easily in alkaline problem.

Claims (5)

1. one kind is the synchronous electrogenesis of anode and the device of sewage purification with slag, comprise bottom non-conducting filler layer (1), slag anode layer (2), current collector (3), top non-conducting filler layer (4), cathode layer (6), wire (7), resistance box (8) and wetland plant (5), it is characterized in that: in vertical current constructed wetland, set gradually bottom non-conducting filler layer (1) from bottom to up, slag anode layer (2), top non-conducting filler layer (4) and cathode layer (6), current collector (3) is buried underground in slag anode layer (2), current collector (3) connects to form loop line with cathode layer (6) respectively by wire (7) and resistance box (8), wetland plant (5) is planted in top non-conducting filler layer (4) through cathode layer (6), described bottom non-conducting filler layer (1) thickness is 3-20cm, slag anode layer (2) thickness is 5-25cm, top non-conducting filler layer (4) thickness is 10-30cm, cathode layer (6) thickness is 3-15cm, and described slag anode layer (2) interior current collector (3) is stainless steel graticule mesh or graphite carbon rod.
2. according to claim 1 a kind of take slag as the synchronous electrogenesis of anode and the device of sewage purification, it is characterized in that: described bottom non-conducting filler layer (1) and top non-conducting filler layer (4) interior filler are the arbitrary combination of in gravel, zeolite, hard coal, biological ceramic particle and quartz sand a kind or 2 to 5 kinds, and particle diameter is 0.5-10mm.
3. according to claim 1 a kind of take slag as the synchronous electrogenesis of anode and the device of sewage purification, it is characterized in that: described wetland plant (5) is Spiked Loosestrife, cyperus alternifolius, wild rice stem, Canna generalis Bailey, the sweet thatch of water, Value of Spartina Anglica, Arundinella hirta (Thunb.) Tanaka, calamus, reed, napier grass, in floral leaf Lu Di and iris a kind or 2 to 12 kinds arbitrary combination.
4. according to claim 1 a kind of take slag as the synchronous electrogenesis of anode and the device of sewage purification, it is characterized in that: described slag anode layer (2) interior filler is discarded slag, in converter slag, open hearth slag, electric furnace slag any one; Slag particle diameter is 1-8mm, and tamped density is 0.35-0.65g/cm 3.
5. according to claim 1 a kind of take slag as the synchronous electrogenesis of anode and the device of sewage purification; it is characterized in that: described cathode layer (6) interior electro-conductive material is any one in graphite granule, gac, graphite felt and stainless steel; described graphite granule, the particle diameter of activated carbon granule are 1-5mm, insert stainless (steel) wire or graphite carbon rod in graphite granule or activated carbon granule.
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