CN104959378B - A kind of bipolar membrane electrolytic cell of removable heavy metal in soil cation - Google Patents

A kind of bipolar membrane electrolytic cell of removable heavy metal in soil cation Download PDF

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CN104959378B
CN104959378B CN201510444768.2A CN201510444768A CN104959378B CN 104959378 B CN104959378 B CN 104959378B CN 201510444768 A CN201510444768 A CN 201510444768A CN 104959378 B CN104959378 B CN 104959378B
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soil
electrolytic cell
bipolar membrane
cation
anode
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CN104959378A (en
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陈日耀
李忠贵
蔡珍
陈晓
郑曦
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Fujian Normal University
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Fujian Normal University
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Abstract

The present invention relates to a kind of environmental pollution improvement's equipment technical field, more particularly to a kind of bipolar membrane electrolytic cell of removable heavy metal in soil cation.Bipolar membrane electrolytic cell involved in the present invention, it is characterized in that being provided with multiple soil treatment units being made up of Bipolar Membrane and cation-exchange membrane between anode and anion-exchange membrane, thus electrolytic cell is divided into anode chamber, soil treating chamber, hydroecium, cathode chamber, is soil treating chamber between anode and anion-exchange membrane.The electrolytic cell that the present invention is built, without outer acid adding, has saved cost;Heavy metal cation can with water decomposition produce oxygen radical ion reaction precipitation and remove;It can connect, by a pair of multiple soil treating chamber of yin, yang Electrode treatment, so as to improve current efficiency and electric slot space utilization rate, reduction energy consumption and cost.

Description

A kind of bipolar membrane electrolytic cell of removable heavy metal in soil cation
Technical field
The present invention relates to a kind of environmental pollution improvement's equipment technical field, more particularly to a kind of removable heavy metal in soil The bipolar membrane electrolytic cell of cation.
Background technology
Heavy metal pollution of soil due to turning into global intractable environment with disguised, chronicity and irreversibility Problem.China's heavy metal pollution cultivated area there are about 2500hm2, more than 1,000 ten thousand tons of grain drop in production is caused every year, grain is polluted More than 1200 ten thousand tons, more than 200 hundred million yuan of economic loss.The U.S.《Immigrant is studied with refugee》Journals report, blood is migrated from China's Mainland The content of beary metal such as lead, cadmium, mercury is higher than the immigrant of other areas in liquid, and wherein lead is higher by 44%.Heavy metal contaminated soil is controlled Reason, is increasingly attracted widespread attention, therefore, numerous Test And Research Works have been carried out in countries in the world now.
At present, the method for processing heavy metal pollution of soil mainly has both at home and abroad:1) heavy metal pollution of soil:Uncontamination soil is replaced dirty Soil is contaminated, this method needs substantial amounts of human and material resources and financial resources, and soil restoration needs the long period, and the soil cemented out is present Secondary pollution problem.2) elution method:It is general to be eluted with acid, it is necessary to which substantial amounts of acid solution, so that substantial amounts of sewage be produced, and holds Easily cause the pollution of underground water.3) electronic chemical method:Heavy metal is migrated to electrode under DC Electric Field, then is passed through Other methods are removed, and energy consumption is larger.4) phytoremediation:Plant is small, and processing speed is slow, the tall and big heavy metal tolerance of plant Difference.5) microorganism remediation method:Timeliness is slow, and condition of culture is harsh, and microorganism difficulty is survived.Monotechnics has its limitation, it is impossible to Promoted in actual applications.
Bipolar Membrane is a kind of new ion-exchange composite membranes, using the soil of Bipolar membrane water splitting repairing heavy metal pollution, With current efficiency and electric slot space utilization rate are high, electrode surface side reaction is few, energy consumption is low, without additional a large amount of acid solutions, no The advantages of producing secondary pollution.The general principle that Bipolar membrane water splitting removes heavy metal in soil cation is Bipolar Membrane in direct current Under field action, intermediate layer reclaimed water is dissociated, and continually generating hydrogen ion, (event will not be produced without outer acid supplemented solution Large amount of sewage), hydrogen ion enters through the anode membrane layer of Bipolar Membrane is eluted out the heavy metal cation in soil in soil chamber, The heavy metal cation for being eluted out is under electric field action, into hydroecium.Meanwhile, Bipolar Membrane intermediate layer water decomposition is produced Hydroxide ion (hydroxide ion is produced by negative electrode in single soil chamber), through Bipolar Membrane cavity block layer under electric field action Into hydroecium, the heavy metal cation reaction with entering hydroecium produces precipitation and removed, from without causing secondary pollution.With much money Category cation is easy to elute under hydrogen ion elution and electric field action, migrates and removed from soil.Gone using Bipolar membrane water splitting Except the method for heavy metal in soil is organically to combine acid elution and electronic chemical method, has the two advantage concurrently, overcome it Shortcoming.In terms of the present invention can be additionally used in the removal of metal cation in the solid waste such as sludge, slag.
The content of the invention
The present invention provides the Bipolar Membrane that a kind of safely and effectively application Bipolar membrane water splitting removes heavy metal in soil cation Electrolytic cell.The electrolytic cell utilizes Bipolar membrane water splitting, and sour elution method is combined with electronic chemical method, removes weight in soil Metal cation, the heavy metal-polluted soil cations after processing are greatly decreased, and do not produce secondary pollution.
Bipolar membrane electrolytic cell involved in the present invention, is by anode, anion exchange in cuboid groove-like structure, electrolytic cell Film and negative electrode sequential are formed, and are divided into anode chamber and cathode chamber naturally, anode and negative electrode respectively with dc source just Negative the two poles of the earth are connected, it is characterized in that being provided between anode and anion-exchange membrane multiple by Bipolar Membrane and cation-exchange membrane The soil treatment unit of composition, is thus divided into anode chamber, soil treating chamber, hydroecium, cathode chamber, Bipolar Membrane and sun by electrolytic cell It is soil treating chamber between amberplex.
Described Bipolar Membrane, is specific ion exchange membrane, and it is by anode membrane layer and the compounded anions and canons of cavity block layer Composite membrane.
Described Bipolar Membrane, capillary ceramic plate is additionally provided with the side towards soil treating chamber.
Described cation-exchange membrane, capillary ceramic plate is additionally provided with the side towards soil treating chamber.
Described multiple soil treatment units being made up of Bipolar Membrane and cation-exchange membrane, in theory can infinitely individual string Connection is formed, it is contemplated that supporting cost and the factor of Current Voltage, it is of the present invention it is multiple refer to 1~6, form two ends For anode chamber, cathode chamber, centre is the soil treating chamber of tandem, hydroecium ... soil treating chamber, multiple series connection of hydroecium Chamber structure.
Bipolar Membrane in above-mentioned electrolytic cell is under DC electric field effect, and intermediate layer reclaimed water is dissociated, generation Hydrogen ion enters in soil chamber through Bipolar Membrane anode membrane layer, and the heavy metal cation in soil is eluted out, is eluted out Heavy metal cation under electric field action, into hydroecium, produced with Bipolar Membrane intermediate layer and move to hydroecium and negative electrode The hydroxide ion reaction of generation, produces precipitation and removes.
The present invention has the advantages and positive effects of:1st, Bipolar Membrane is under DC electric field effect, intermediate layer reclaimed water Generation is dissociated and produces hydrogen ion, without outer acid adding, has saved cost, reduces the generation of sewage.2nd, the huge sum of money for being eluted out Category cation is easy to elute under hydrogen ion elution and electric field action, migrates and removed from soil.3rd, into a huge sum of money for hydroecium The hydroxide ion reaction of (or negative electrode generation) can be produced with water decomposition in Bipolar Membrane intermediate layer by belonging to cation, and it is heavy to produce Form sediment and remove, do not cause secondary pollution.4th, it can connect, so as to improve current efficiency and electric slot space utilization rate, reduce electrode Surface side reaction occurs, reduces energy consumption and cost.
Brief description of the drawings
Fig. 1 is a kind of bipolar membrane electrolytic cell structural representation of removable heavy metal in soil cation of the present invention Figure.
Fig. 2 is a kind of removable heavy metal in soil cation of the multiple soil treatment units of setting of the present invention Bipolar membrane electrolytic cell structural representation.
Embodiment
In order to further understand the content, features and effects of the present invention, hereby being done by way of examples with reference to accompanying drawing Describe in detail.
In Fig. 1:1 is electrolytic cell;2 be anode;3 be Bipolar Membrane;4 be capillary ceramic plate;5 be cation-exchange membrane;6 be cloudy Amberplex;7 be negative electrode;I is anode chamber;II is soil chamber;III is hydroecium;IV is cathode chamber.
In Fig. 1:1 is electrolytic cell;2 be anode;3 be Bipolar Membrane;4 be capillary ceramic plate;5 be cation-exchange membrane;6 be cloudy Amberplex;7 be negative electrode;I is anode chamber;II is soil chamber;III is hydroecium;IV is cathode chamber.
Embodiment 1
The electrolytic cell of heavy metal in soil cation, soil are removed using a kind of application Bipolar membrane water splitting as shown in Figure 1 The both sides of room respectively use Bipolar Membrane and anode membrane, anode chamber and hydroecium are separated, in addition between soil and film with capillary ceramic plate every Open, anode and negative electrode are connected with the positive and negative polarities of dc source respectively.
Contain Pb in contaminated soil handled by the present embodiment2+、Zn2+、Cu2+、Cd2+、Ni2+、Cr3+、Cr6+Deng heavy metal from Son, voltage gradient is 1.0V/m, and electrode spacing is 12cm, and system continuously runs 4d.Added in anode chamber and cathode chamber with 0.05mol/L Na2SO4Solution is as electrolyte, and its liquid level is concordant with contaminated soil, contaminated soil before and after the processing a huge sum of money Category content is shown in Table 1.
Table 1:Content of beary metal (mg/Kg) before and after soil treatment.
Heavy metal Pb Zn Cd Cu Cr Ni
Before processing 2500 2500 250 2000 1500 1000
After processing 328 378 18 286 192 132
Embodiment 2
The electrolytic cell of heavy metal in soil cation, soil are removed using a kind of application Bipolar membrane water splitting as shown in Figure 2 The both sides of room are separated with Bipolar Membrane and anode membrane with anode chamber and hydroecium respectively, in addition between soil and film with capillary ceramic plate every Open, 3 soil chambers replace series connection with 3 hydroeciums.Anode and negative electrode are connected with the positive and negative polarities of dc source respectively.
Contain Pb in contaminated soil handled by the present embodiment2+、Zn2+、Cu2+、Cd2+、Ni2+、Cr3+、Cr6+Deng heavy metal from Son, voltage gradient is 1.0V/m, and electrode spacing is 36cm, and system continuously runs 4d.Added in anode chamber and cathode chamber with 0.05mol/L Na2SO4Solution is as electrolyte, and its liquid level is concordant with contaminated soil, contaminated soil before and after the processing a huge sum of money Category content is shown in Table 2
Table 2:Content of beary metal mg/Kg before and after soil treatment
Embodiment 3
The electrolytic cell of heavy metal in soil cation, soil are removed using a kind of application Bipolar membrane water splitting as shown in Figure 2 The both sides of room are separated with Bipolar Membrane and anode membrane with anode chamber and hydroecium respectively, in addition between soil and film with capillary ceramic plate every Open, 3 soil chambers replace series connection with 3 hydroeciums.Anode and negative electrode are connected with the positive and negative polarities of dc source respectively.
Contain Pb in contaminated soil handled by the present embodiment2+、Zn2+、Cu2+、Cd2+、Ni2+、Cr3+、Cr6+Deng metal from Son, voltage gradient is 0.85V/cm, and electrode spacing is 30cm, and system continuously runs 3d.Added in anode chamber and cathode chamber with 0.1mol/L Na2SO4Solution is as electrolyte, and its liquid level is concordant with contaminated soil, contaminated soil heavy metal before and after the processing Content is shown in Table 3.
Table 3:Content of beary metal mg/Kg before and after soil treatment
Embodiment 4
The electrolytic cell of heavy metal in soil cation, soil are removed using a kind of application Bipolar membrane water splitting as shown in Figure 2 The both sides of room are separated with Bipolar Membrane and anode membrane with anode chamber and hydroecium respectively, in addition between soil and film with capillary ceramic plate every Open, 3 soil chambers replace series connection with 3 hydroeciums.Anode and negative electrode are connected with the positive and negative polarities of dc source respectively.
Contain Pb in the handled contaminated soil of this experiment2+、Zn2+、Cu2+、Cd2+、Ni2+、Cr3+、Cr6+Deng metal ion, Voltage gradient is 1.5V/cm, and electrode spacing is 32cm, and system continuously runs 5d.Added in anode chamber and cathode chamber with 0.5mol/L Na2SO4Solution is as electrolyte, and its liquid level is concordant with contaminated soil, contaminated soil heavy metal before and after the processing Content is shown in Table 4.
Table 4:Content of beary metal mg/Kg before and after soil treatment

Claims (5)

1. a kind of bipolar membrane electrolytic cell of removable heavy metal in soil cation, be in cuboid groove-like structure, electrolytic cell by Anode, anion-exchange membrane and negative electrode sequential are formed, and are divided into anode chamber and cathode chamber, anode and negative electrode difference naturally It is connected with the positive and negative polarities of dc source, it is characterized in that being provided between anode and anion-exchange membrane multiple by Bipolar Membrane The soil treatment unit constituted with cation-exchange membrane, is thus divided into anode chamber, soil treating chamber, hydroecium, the moon by electrolytic cell Pole room, is soil treating chamber between Bipolar Membrane and cation-exchange membrane.
2. a kind of bipolar membrane electrolytic cell of removable heavy metal in soil cation according to claim 1, it is characterized in that Described Bipolar Membrane is specific ion exchange membrane, and it is by anode membrane layer and the compounded yin, yang composite membrane of cavity block layer.
3. a kind of bipolar membrane electrolytic cell of removable heavy metal in soil cation according to claim 1, it is characterized in that Described Bipolar Membrane, capillary ceramic plate is additionally provided with the side towards soil treating chamber.
4. a kind of bipolar membrane electrolytic cell of removable heavy metal in soil cation according to claim 1, it is characterized in that Described cation-exchange membrane, capillary ceramic plate is additionally provided with the side towards soil treating chamber.
5. a kind of bipolar membrane electrolytic cell of removable heavy metal in soil cation according to claim 1, it is characterized in that Described soil treatment unit, there is 1~6, forms two ends for anode chamber, cathode chamber, and centre is the soil treatment of tandem Room, hydroecium ... soil treating chamber, the chamber structure of hydroecium.
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CN106623398B (en) * 2016-10-15 2022-09-27 太原理工大学 Ferric salt reinforced electrodynamic remediation device for heavy metal pollution of electronic waste dismantling field
CN111036670A (en) * 2019-12-21 2020-04-21 西安中科贝昂环保科技有限公司 A separation repair structure for soil heavy metal pollution
CN113025829B (en) * 2021-04-26 2022-12-06 福建师范大学 Method for treating copper ore smelting waste residues by applying bipolar membrane electrodialysis
CN114368864A (en) * 2021-12-30 2022-04-19 嘉兴诚毅环保科技有限责任公司 Industrial sewage treatment device

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