CN107892363A - The water treatment facilities and method of a kind of synchronous electrogenesis and conversion high volence metal ion - Google Patents
The water treatment facilities and method of a kind of synchronous electrogenesis and conversion high volence metal ion Download PDFInfo
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- CN107892363A CN107892363A CN201711365190.7A CN201711365190A CN107892363A CN 107892363 A CN107892363 A CN 107892363A CN 201711365190 A CN201711365190 A CN 201711365190A CN 107892363 A CN107892363 A CN 107892363A
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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
- 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
- C02F1/46176—Galvanic cells
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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
- 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
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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
- 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
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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
- 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
- C02F2001/46138—Electrodes comprising a substrate and a coating
- C02F2001/46142—Catalytic coating
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4612—Controlling or monitoring
- C02F2201/46125—Electrical variables
- C02F2201/46135—Voltage
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4612—Controlling or monitoring
- C02F2201/46125—Electrical variables
- C02F2201/4614—Current
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
Abstract
The invention discloses a kind of synchronous electrogenesis and the water treatment facilities and method of conversion high volence metal ion.The device includes electro-chemical systems；The electro-chemical systems include at least one electrochemical cell；Each electrochemical cell includes：Active metal anode, the material of the active metal anode are the metal that standard electrode potential is negative value；Porous catalytic negative electrode, the porous catalytic negative electrode are formed including porous, electrically conductive matrix；Porous dielectric separation layer, it comes the active metal anode and the porous catalytic cathode spacer.Apparatus of the present invention and method are easy to operate, low to raw material and equipment requirement, and the water that can be polluted to high price heavy metal (such as chromium, vanadium) is handled, and effect is good, and removal of heavy metal ions rate reaches more than 90%, and electricity production power density reaches 810W/m3, realize synchronous electrogenesis with scale for industrialization and go valence heavy metal ions in water removal to provide a kind of new method.
Description
Technical field
At water-treatment technology field, more particularly to the water of a kind of synchronous electrogenesis and conversion high volence metal ion
Manage device and method.
Background technology
With the continuous development of process of industrialization, industrial wastewater discharge increasingly causes the concern of people.People are exploring
During tackling industrial pollution, the removal and degraded of pollutant are not confined to merely, it is required that realizing purification of waste water
The recovery of the energy or resource is realized simultaneously.Chemical substance in waste water is a potential energy and material source.Wherein, waste water
In redox species account for sizable ratio, especially high-valency metal compound.In addition, high oxidation state metal compound is past
Toward showing higher migration and harmfulness, such as high price radioactive metal, such as U (VI), Tc (VII), Np (V) and Pu (VI),
And the heavy metal Cr (VI) of carcinogenicity and V (V) etc..Therefore, low-oxidation-state is reduced to, it can be reduced to greatest extent
Environmental hazard.Routine techniques mainly has electronation, biological reducing and electrochemical reduction etc..Although above method is more effective
The problem of its toxicity and migration, is alleviated on ground, but also result in a large amount of medicament and the energy inputs, if can be by containing in waste water
Energy reclaimed, substantial amounts of cost of water treatment can be saved, and certain economic results in society can be obtained.
It was found from oxidation-reduction potential analysis, high volence metal ion has higher oxidation-reduction potential.Electrochemical techniques
It can be used for handling and reclaiming heavy metal, while be also possible to the collection of energy in waste water and convert it into electric energy.In reality
In the water treatment procedure on border, electrolytic tank electrolysis technology can reduce heavy metal ion in water or oxidation, but process consumption electric energy,
Add cost for wastewater treatment；Galvanic cell micro electrolysis tech treatment effeciency is higher, but can not collect the energy in waste water.It is if sharp
With galvanic principles, suitable electrochemical energy retracting device is built, high volence metal ion is as electron acceptor using in waste water, together
When the relatively low material of selective redox current potential as electron donor, the energy that high volence metal ion itself contains can be converted to
Come, while reduce the toxicity of metal ion.
The Chinese patent of Application No. 201110386545.7 discloses a kind of self-produced electric energy while removes metal ion
Devices and methods therefor, the device are divided into anode chamber and cathode chamber, and centre is ion or PEM, and anode chamber is reproducibility thing
The aqueous solution of matter, cathode chamber is high volence metal ion, but ion or PEM price are higher, and easily old in waste water
Change, be not suitable for a wide range of popularization and application.
The content of the invention
It is an object of the invention to provide a kind of synchronous electrogenesis and the water treatment facilities and method of conversion high volence metal ion, behaviour
Facilitate, it is low to raw material and equipment requirement, the waste water of high price heavy metal pollution can be handled, cost is low, effect is good, is easy to
Practical application.
The water treatment facilities of a kind of synchronous electrogenesis provided by the invention and conversion high volence metal ion；It includes electrochemistry system
System；The electro-chemical systems include at least one electrochemical cell；Each electrochemical cell includes：
Active metal anode, the material of the active metal anode are the metal that standard electrode potential is negative value；
Porous catalytic negative electrode, the porous catalytic negative electrode include porous, electrically conductive matrix；
Porous dielectric separation layer, it comes the active metal anode and the porous catalytic cathode spacer.
In above-mentioned water treatment facilities, the material of the active metal anode can be cheap aluminium, iron or zinc.
In above-mentioned water treatment facilities, the porosity of the porous catalytic negative electrode can be 30%~90% (such as 60%).Institute
The thickness for stating porous catalytic negative electrode can be 1~10mm (such as 5mm).
The porous, electrically conductive matrix can be graphite felt (graphite fibre felt), carbon cloth, carbon paper, nickel foam, foam copper or foam
Titanium.
The porous catalytic negative electrode may also include the catalyst being supported on the porous, electrically conductive matrix.The catalyst can
For polyaniline, polypyrrole, palladium, gold or platinum.The load capacity of the catalyst can be 0~50mg/cm2, such as 10mg/cm2。
In above-mentioned water treatment facilities, the material of the porous dielectric separation layer can be cheap polyurethane, nylon or poly-
Tacryl, it is hydrophilic porous layer.
The porosity of the porous dielectric separation layer can be 40%~70% (such as 70%), and aperture can be 0.1~1.2 μm
(such as 0.8 μm).
The thickness of the porous dielectric separation layer can be 1~5mm (such as 2mm).
In above-mentioned water treatment facilities, the connected mode of electrode can be that monopole connection or multipole connect in the electro-chemical systems
Connect；
The number of the electrochemical cell is 1, and the connected mode connects for monopole, specific as follows：Electrochemical cell
In active metal anode and porous catalytic negative electrode be connected by wire with outer meeting resistance or energy storage device I；
The number of the electrochemical cell is more than or equal to 2, and the connected mode connects for multipole, specific as follows：The
The porous catalytic negative electrode in active metal anode and last electrochemical cell in one electrochemical cell by wire with
Outer meeting resistance or energy storage device I are connected；In porous catalytic negative electrode and second electrochemical cell in first electrochemical cell
Active metal anode be connected by wire, porous catalytic negative electrode and the 3rd electrochemical cell in second electrochemical cell
In active metal anode be connected by wire, the like；Between each electrochemical cell by the porous dielectric every
Absciss layer is kept apart.
Above-mentioned water treatment facilities also include raw water water tank, pretreatment unit, pH adjustment units, precipitation separative element and
Energy storage device II；The raw water water tank, the pretreatment unit, the pH adjustment units, electro-chemical systems and described
Precipitation separative element is sequentially connected；The pretreatment unit is used to carry out primary filter to waste water raw water；The energy storage device II
It is connected with the electro-chemical systems, for storing caused electric energy in the electro-chemical systems；The precipitation separative element is used for
PH value by adjusting waste water makes obtained low valence metal ion co-precipitation.
Invention further provides realize high-valency metal in synchronous electrogenesis and conversion waste water using above-mentioned water treatment facilities
The method of ion, comprises the following steps：Waste water containing high volence metal ion passes through the porous catalytic negative electrode, the active metal sun
Pole loses electronics and by outer meeting resistance and/or energy storage device I by electron transmission to the porous catalytic negative electrode, the high price weight
Metal ion obtains electronics on the surface of the porous catalytic negative electrode and is reduced to low valence metal ion, completes synchronous electrogenesis and height
The conversion of valence metal ion.
In above-mentioned method, the high volence metal ion can be Cr (VI), V (V), U (VI), Tc (VII), Np (V) or Pu
(VI)。
The approach axis of the waste water containing high volence metal ion can be with electrode runs parallel.
In above-mentioned method, the work for the catalyst that the high volence metal ion can load in the porous catalytic cathode surface
With lower reduction.The reduction of the high volence metal ion is to be reduced directly (catalyst by the catalyst of porous catalytic cathode surface
Electronics is indirectly transferred to by high volence metal ion by the change of itself valence state, so that it is reduced), or caused active specy
(electron reduction hydrogen ion produces hydroperoxyl radical) that indirect reduction is realized；The presence of the catalyst can with Accelerating reduction process,
Electronics is set to be easier to pass to high volence metal ion.Active metal anode loses electronics, itself is converted into free state ion.
In above-mentioned method, by adjusting the size of the outer meeting resistance, control voltage and electric current, high price is further controlled
The rate of reduction of metal ion.The energy storage device I can get up caused electrical power storage.
Above-mentioned method also includes waste water raw water is carried out to primary filter successively and adjusted before high volence metal ion is reduced
The step of pH.
Above-mentioned method also includes the low price gold obtained by adjusting the pH value of waste water to make after high volence metal ion is reduced
The step of belonging to ion co-precipitation.
The present invention has the advantages that：
(1) water treatment facilities of the present invention, using porous conductive material supported catalyst as negative electrode, contains using active metal as anode
The waste water of high volence metal ion passes through porous catalytic negative electrode, and active metal anode loses electronics and passed electronics by institute's connecting resistance
Porous catalytic negative electrode is handed to, high volence metal ion obtains electronics on the surface of the porous catalytic negative electrode and is reduced to low-valent metal
Ion, complete the conversion of synchronous electrogenesis and high volence metal ion.(high volence metal ion is dense to raw water strong adaptability for the inventive method
Spend 10ug/L~200mg/L), pH (0~5.0) applied widely, can realize simultaneously electricity production and reduction valence heavy metal ions.
(2) apparatus of the present invention and method are easy to operate, low to raw material and equipment requirement, can be to high price heavy metal (such as chromium, vanadium
Deng) water of pollution handled, effect is good, and removal of heavy metal ions rate reaches more than 90%, and electricity production power density reaches 810W/
m3, realize synchronous electrogenesis with scale for industrialization and go valence heavy metal ions in water removal to provide a kind of new method and newly answer
With.
Brief description of the drawings
Fig. 1 is synchronous electrogenesis of the present invention and reduces the structural representation of the water treatment facilities of valence heavy metal ions.
It is each to represent as follows in Fig. 1：
1. raw water water tank, 2. pretreatment unit, 3. pH adjustment units, 4. electro-chemical systems, 5. energy storage device II, 6. sink
Shallow lake separative element.
Fig. 2 is that the electro-chemical systems in the synchronous electrogenesis of embodiment 1 and the water treatment facilities for reducing valence heavy metal ions are (single
Pole formula) structural representation.
Fig. 3 is that the electro-chemical systems in the synchronous electrogenesis of embodiment 2 and the water treatment facilities for reducing valence heavy metal ions are (multiple
Pole formula) structural representation.
Each sign is as follows in Fig. 2 and Fig. 3：1 active metal anode, 2 porous dielectric separation layers, 3 porous catalytic negative electrodes, outside 4
Connect wire, 5 outer meeting resistances (or energy storage device I).
Embodiment
The present invention is described below by specific embodiment.Unless stated otherwise, technological means used in the present invention
It is method known in those skilled in the art.In addition, embodiment is interpreted as illustrative, it is not intended to limit the present invention
Scope, the spirit and scope of the invention are limited only by the claims that follow.To those skilled in the art, without departing substantially from this
The various changes carried out on the premise of invention spirit and scope to the material component in these embodiments and dosage or change
Belong to protection scope of the present invention.
Experimental method used in following embodiments is conventional method unless otherwise specified.
Material used, reagent etc., unless otherwise specified, are commercially obtained in following embodiments.
Catalyst polyaniline in following embodiments in porous catalytic negative electrode graphite felt uses constant current multistep electrodeposition process
Prepare, it is specific as follows：Porous, electrically conductive matrix graphite felt is placed in electrolyte (0.5M aniline monomers, 1M perchloric acid solutions), first
In current density 2.0mA cm-210min is deposited, is followed by 1.0mA cm-2Deposit 2hr, last 0.5mAcm-22hr is deposited, is obtained
Polyaniline (the load capacity 10mg/cm being supported in graphite felt2)。
As shown in figure 1, water treatment facilities of the present invention include raw water water tank 1., pretreatment unit 2., pH adjustment units 3.,
Electro-chemical systems 4., energy storage device II 5. with precipitation separative element；Raw water water tank 1., pretreatment unit 2., pH adjustment units
3., electro-chemical systems 4. with precipitation separative element be 6. sequentially connected；2. pretreatment unit is used to carry out primary mistake to waste water raw water
Filter；5. 4. energy storage device II is connected with electro-chemical systems, for storing caused electric energy in electro-chemical systems；Precipitate separative element
6. for the low valence metal ion co-precipitation obtained by adjusting the pH value of waste water to make.
As shown in Figures 2 and 3,4. electro-chemical systems include at least one electrochemical cell；Each electrochemical cell includes：
Material is the active metal anode 1 that standard electrode potential is negative value (such as aluminium, iron or zinc)；
By porous, electrically conductive matrix (such as graphite felt, carbon cloth, carbon paper, nickel foam, foam copper or titanium foam) and it is supported on porous
Load capacity on conducting base is 0~50mg/cm2Catalyst (such as polyaniline, polypyrrole, palladium, gold or platinum) form hole
Rate is 30%~90%, and thickness is 1~10mm porous catalytic negative electrode 3；
Porosity is 40%~70%, and aperture is 0.1~1.2 μm, and thickness is 1~5mm porous dielectric separation layer 2, its
The active metal anode and the porous catalytic cathode spacer are come；
The connected mode of electrode is that monopole connects or multipole connects in electro-chemical systems.
The number of electrochemical cell is 1, and connected mode connects for monopole, specific as follows：It is active in electrochemical cell
Metal anode and porous catalytic negative electrode are connected by wire with outer meeting resistance or energy storage device I；
The number of electrochemical cell is more than or equal to 2, and connected mode connects for multipole, specific as follows：First former electricity
The porous catalytic negative electrode in active metal anode and last electrochemical cell in pool unit passes through wire and outer meeting resistance
Or energy storage device I is connected；The active gold in porous catalytic negative electrode and second electrochemical cell in first electrochemical cell
Category anode is connected by wire, active in the porous catalytic negative electrode and the 3rd electrochemical cell in second electrochemical cell
Metal anode is connected by wire, the like；Isolated between each electrochemical cell by the porous dielectric separation layer
Come.
Application method is as follows：Raw water water tank 1. in the waste water containing high volence metal ion to sequentially enter pretreatment unit 2. right
Waste water carries out primary filter, 3. pH adjustment units adjust pH value, subsequently into electro-chemical systems 4., electro-chemical systems 4. in,
Direction of the waste water along electrode at a through porous catalytic negative electrode, active metal anode lose electronics and by outer meeting resistance and/
Or energy-storage units, by electron transmission to porous catalytic cathode, in the presence of catalyst, high volence metal ion is cloudy in porous catalytic
The surface of pole obtains electronics and is reduced to low valence metal ion, and the waste water after reduction is discharged by b, is 4. discharged from electro-chemical systems
6. waste water enters precipitation separative element, the low valence metal ion that the pH value by adjusting the waste water after reducing makes to obtain is co-precipitated,
Reach the effect being separated from the water, discharge waste water, you can complete the conversion of synchronous electrogenesis and high volence metal ion.
Embodiment 1, synchronous electrogenesis and the water treatment facilities (acyclic type) for reducing valence heavy metal ions
First, the structure of water treatment facilities
As shown in Fig. 2 the electrochemistry system in the water treatment facilities of the present embodiment synchronous electrogenesis and conversion high volence metal ion
4. system includes 1 electrochemical cell；The electrochemical cell includes：
The active metal anode 1 that the iron plate that thickness is 3mm is formed；
By porous, electrically conductive matrix graphite felt (average diameter of graphite fibre is 15 microns) and it is supported on negative in graphite felt
Carrying capacity is 10mg/cm2Catalyst polyaniline form thickness be 5mm, the porous catalytic negative electrode 3 that porosity is 60%；
The porous dielectric separation layer 2 that the polypropylene fibre that porosity is 70%, aperture is 0.8 μm, thickness is 2mm is formed,
It separates active metal anode 1 and porous catalytic negative electrode 3；
Active metal anode 1 and porous catalytic negative electrode 3 are connected by wire 4 with the outer meeting resistance 5 that resistance is 10 Ω.
2nd, waste water is handled using above-mentioned water treatment facilities
1st, to being handled containing concentration for the waste water of 10mg/L Cr VIs
Hexavalent chromium wastewater containing 10mg/L is handled using above-mentioned water treatment facilities, comprised the following steps：
2.0 will be adjusted to for the pH value of waste water of 10mg/L hexavalent chromiums containing concentration, with 0.1cm/s flow velocity along electrode
Direction (shown in arrow) passes through porous catalytic negative electrode, residence time 50s；Output voltage is 0.4V, and active metal anode loses electricity
Son and by outer meeting resistance by electron transmission to porous catalytic cathode, in the presence of catalyst, Cr VI is cloudy in porous catalytic
The surface of pole obtains electronics and is reduced to low price chromium (trivalent), adjust the pH value of waste water for 8.0 make low valence metal ion (equivalent
Trivalent chromium and ferric iron) co-precipitation, precipitation is removed from waste water, you can complete the conversion of synchronous electrogenesis and hexavalent chromium.
Hexavalent chromium removal rate reaches 90%, and electricity production power density is 6.4W/m2.Produce electricity power density formula：P=UI/A=0.4V*
0.04A/0.0025m2=6.4W/m2, wherein U is output voltage, and I is electric current, and A is the area of negative electrode.
2nd, the waste water of the Cr VI containing 100mg/L is handled
Hexavalent chromium wastewater containing 100mg/L is handled using above-mentioned water treatment facilities, comprised the following steps：
It is 1.5 by the waste water of the hexavalent chromium containing 100mg/L regulation pH value, with 0.1cm/s flow velocity along electrode direction (arrow
Shown in head) pass through porous catalytic negative electrode 3, residence time 50s；Output voltage is 0.65V, and active metal anode loses electronics and led to
Outer meeting resistance is crossed by electron transmission to porous catalytic cathode, in the presence of catalyst, table of the Cr VI in porous catalytic negative electrode
Face obtains electronics and is reduced to low price chromium (trivalent chromium), adjusts the pH value of waste water and makes the low valence metal ion (trivalent of equivalent for 8.0
Chromium and ferric iron) co-precipitation, precipitation is removed from waste water, you can complete the conversion of synchronous electrogenesis and hexavalent chromium.Sexavalence
For chromium clearance up to 95%, electricity production power density is 16.9W/m2.Produce electricity power density computation formula：P=UI/A=0.65V*
0.065A/0.0025m2=16.9W/m2, wherein U is output voltage, and I is electric current, and A is the area of negative electrode.
Embodiment 2, synchronous electrogenesis and the water treatment facilities (bipolar type) for reducing valence heavy metal ions
First, the structure of water treatment facilities
As shown in figure 3, the electrochemistry system in the water treatment facilities of the present embodiment synchronous electrogenesis and conversion high volence metal ion
4. system includes 6 electrochemical cells；Each electrochemical cell includes：
The active metal anode 1 that the iron plate that thickness is 3mm is formed；
By porous, electrically conductive matrix graphite felt (average diameter of graphite fibre is 15 μm) and the load being supported in graphite felt
Measure as 10mg/cm2Catalyst polyaniline form thickness be 5mm, the porous catalytic negative electrode 3 that porosity is 60%；
The porous dielectric separation layer 2 that the polypropylene fibre that porosity is 70%, aperture is 0.8 μm, thickness is 2mm is formed,
It separates active metal anode 1 and porous catalytic negative electrode 3；
The porous catalytic negative electrode 3 in active metal anode 1 and the 6th electrochemical cell in first electrochemical cell
It is connected by wire 4 with the outer meeting resistance 5 that resistance is 50 Ω；Porous catalytic negative electrode 3 and second in first electrochemical cell
Active metal anode 1 in individual electrochemical cell is connected by external wire 4；Porous catalytic in second electrochemical cell is cloudy
Pole 3 is connected with the active metal anode 1 in the 3rd electrochemical cell by external wire 4, the like；Each galvanic cell list
Kept apart between member by porous dielectric separation layer 2.
2nd, waste water is handled using above-mentioned water treatment facilities
1st, to being handled containing concentration for the waste water of 50mg/L Cr VIs
Hexavalent chromium wastewater containing 50mg/L is handled using above-mentioned water treatment facilities, comprised the following steps：
2.0 will be adjusted to for the pH value of waste water of 50mg/L hexavalent chromiums containing concentration, with 1cm/s flow velocity along electrode side
Porous catalytic negative electrode, residence time 5s are passed through to (shown in arrow)；Output voltage is 1.2V, and active metal anode loses electronics simultaneously
By outer meeting resistance by electron transmission to porous catalytic cathode, in the presence of catalyst, Cr VI is in porous catalytic negative electrode
Surface obtains electronics and is reduced to low price chromium (trivalent), adjusts the pH value of waste water and low valence metal ion is co-precipitated (trivalent for 8.0
Chromium and ferric iron), precipitation is removed from waste water, you can complete the conversion of synchronous electrogenesis and hexavalent chromium.Hexavalent chromium removal
Rate reaches 95%, and electricity production power density is 230W/m3.Produce electricity power density computation formula：P=UI/V=1.2V*0.024A/
0.000125m3=230W/m3, wherein U is output voltage, and I is electric current, and V is the volume of electrode group.
2nd, to being handled containing concentration for the waste water of 100mg/L Cr VIs
Hexavalent chromium wastewater containing 100mg/L is handled using above-mentioned water treatment facilities, comprised the following steps：
2.0 will be adjusted to for the pH value of waste water of 100mg/L hexavalent chromiums containing concentration, with 5cm/s flow velocity along electrode
Direction (shown in arrow) passes through porous catalytic negative electrode, residence time 1s；Open-circuit voltage is 1.55V, and active metal anode loses electricity
Son and by outer meeting resistance by electron transmission to porous catalytic cathode, in the presence of catalyst, Cr VI is cloudy in porous catalytic
The surface of pole obtains electronics and is reduced to low price chromium (trivalent), adjusts the pH value of waste water and is co-precipitated low valence metal ion for 8.0
(trivalent chromium and ferric iron), precipitation is removed from waste water, you can complete the conversion of synchronous electrogenesis and hexavalent chromium.Cr VI
Clearance reaches 90%, and electricity production power density is 384W/m3.Produce electricity rating formula：P=UI/V=1.55V*0.031A/
0.000125m3=384W/m3, wherein U is output voltage, and I is electric current, and V is the volume of electrode group.
3rd, to being handled containing concentration for the waste water of 100mg/L Cr VIs
Hexavalent chromium wastewater containing 100mg/L is handled using above-mentioned water treatment facilities, comprised the following steps：
2.0 will be adjusted to for the pH value of waste water of 100mg/L hexavalent chromiums containing concentration, with 10cm/s flow velocity along electrode
Direction (shown in arrow) passes through porous catalytic negative electrode, residence time 1s；Open-circuit voltage is 2.25V, and active metal anode loses electricity
Son and by outer meeting resistance by electron transmission to porous catalytic cathode, in the presence of catalyst, Cr VI is cloudy in porous catalytic
The surface of pole obtains electronics and is reduced to low price chromium (trivalent), adjusts the pH value of waste water and is co-precipitated low valence metal ion for 8.0
(trivalent chromium and ferric iron of equivalent), precipitation is removed from waste water, you can complete the conversion of synchronous electrogenesis and hexavalent chromium.
Hexavalent chromium removal rate reaches 90%, and electricity production power density is 810W/m3.Produce electricity rating formula：P=UI/V=2.25V*
0.045A/0.000125m3=810W/m3, wherein U is output voltage, and I is electric current, and V is the volume of electrode group.
Claims (10)
- A kind of 1. water treatment facilities of synchronous electrogenesis and conversion high volence metal ion, it is characterised in that：It includes electro-chemical systems； The electro-chemical systems include at least one electrochemical cell；Each electrochemical cell includes：Active metal anode, the material of the active metal anode are the metal that standard electrode potential is negative value；Porous catalytic negative electrode, the porous catalytic negative electrode include porous, electrically conductive matrix；Porous dielectric separation layer, it comes the active metal anode and the porous catalytic cathode spacer.
- 2. water treatment facilities according to claim 1, it is characterised in that：The material of the active metal anode is aluminium, iron Or zinc.
- 3. water treatment facilities according to claim 1 or 2, it is characterised in that：The porosity of the porous catalytic negative electrode is 30%~90%；And/orThe thickness of the porous catalytic negative electrode is 1~10mm；And/orThe porous, electrically conductive matrix is graphite felt, carbon cloth, carbon paper, nickel foam, foam copper or titanium foam.
- 4. according to the water treatment facilities any one of claim 1-3, it is characterised in that：The porous catalytic negative electrode also wraps Include the catalyst being supported on the porous, electrically conductive matrix；And/orThe catalyst is polyaniline, polypyrrole, palladium, gold or platinum；And/orThe load capacity of the catalyst is 0~50mg/cm2。
- 5. according to the water treatment facilities any one of claim 1-4, it is characterised in that：The porous dielectric separation layer Material is polyurethane, nylon or polypropylene fibre；And/orThe porosity of the porous dielectric separation layer is 40%~70%, and aperture is 0.1~1.2 μm；And/orThe thickness of the porous dielectric separation layer is 1~5mm.
- 6. according to the water treatment facilities any one of claim 1-5, it is characterised in that：Electrode in the electro-chemical systems Connected mode for monopole connect or multipole connection；The number of the electrochemical cell is 1, and the connected mode connects for monopole；The number of the electrochemical cell is more than or equal to 2, and the connected mode connects for multipole.
- 7. realize high-valency metal in synchronous electrogenesis and conversion waste water using the water treatment facilities any one of claim 1-6 The method of ion, comprises the following steps：Waste water containing high volence metal ion passes through the porous catalytic negative electrode, the active metal sun Pole loses electronics and by outer meeting resistance and/or energy storage device by electron transmission to the porous catalytic negative electrode, the high price weight Metal ion obtains electronics on the surface of the porous catalytic negative electrode and is reduced to low valence metal ion, completes synchronous electrogenesis and height The conversion of valence metal ion.
- 8. according to the method for claim 7, it is characterised in that：The approach axis of the waste water containing high volence metal ion and electricity The direction of pole is parallel.
- 9. the method according to claim 7 or 8, it is characterised in that：The high volence metal ion is cloudy in the porous catalytic Reduced in the presence of the catalyst of pole area load.
- 10. according to the method any one of claim 7-9, it is characterised in that：Methods described reduction high-valency metal from The step of also including the low valence metal ion co-precipitation obtained by adjusting the pH value of waste water to make after son.
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