CN205085146U - Use bipolar membrane technology and get rid of electrolysis trough of chromium in soil - Google Patents
Use bipolar membrane technology and get rid of electrolysis trough of chromium in soil Download PDFInfo
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- CN205085146U CN205085146U CN201520549175.8U CN201520549175U CN205085146U CN 205085146 U CN205085146 U CN 205085146U CN 201520549175 U CN201520549175 U CN 201520549175U CN 205085146 U CN205085146 U CN 205085146U
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Abstract
The utility model relates to a can get rid of in the soil the bipolar membrane electrolysis trough of trivalent chromium and hexavalent chromium simultaneously. The utility model relates to a bipolar membrane electrolysis trough, for cuboid trough - shaped structure, by the positive pole in the electrolysis trough, anion exchange membrane and negative pole are arranged according to the preface and are formed, and separate naturally for anode chamber and cathode chamber, positive pole and negative pole are connected with DC power supply's positive and negative poles respectively, characterized by is provided with by anion exchange membrane between positive pole and anion exchange membrane, the soil processing unit that bipolar membrane and cation exchange membrane constitute, separate the electrolysis trough for the anode chamber from this, two parallel the soil room, metal ion room and cathode chamber, be the soil room between bipolar membrane and the anion exchange membrane. The utility model discloses the electrolysis trough that makes up need not outer acidification or other anion, has practiced thrift the cost, can get rid of trivalent chromium and hexavalent chromium simultaneously, can establish ties, through a plurality of soil rooms of a pair of yin, yang electrode treatment to increasing current efficiency and electrolyzer space utilization reduce energy consumption and cost.
Description
Technical field
The utility model relates to a kind of environmental pollution improvement equipment technical field, and particularly a kind of applying double pole membrane technology removes trivalent chromium and chromic electrolytic cell in soil simultaneously.
Background technology
Along with the quickening of urbanization process, the high speed development of chromium industry, municipal sewage, rubbish, mud and various industrial chromium slag become a main source of soil Cr.Chromium is usually with Cr
3+and Cr
6+two kinds of stable valence states are present in soil.Cr
3+can be fixing by absorption, very easily adsorbed by soil colloid or form precipitation; Cr
6+main with HCrO
-and CrO
4 2-form exist, having that water-soluble, chemism is large, the feature of strong toxicity, is the major pollutants during soil Cr is polluted.
At present, the method of domestic and international process chromium-polluted soil mainly contains: 1) solidify stabilization method: fully mixed with binder by chromium-polluted soil, chromium is embedded in solid matrix, reduce chromium transfer ability, the method cannot be eliminated the chromium ion in soil, and chromium still remains in soil environment; 2) chemical reduction method: utilize reducing agent to be reduced by Cr (VI) and form insoluble compound precipitation, but reduction effect is thorough not, the Cr (VI) for granule interior is difficult to contact and reduces; 2) elution method: conventional eluent has inorganic acid, organic acid, surfactant, artificial chelating agent or water, can produce a large amount of sewage, easily cause the pollution of underground water; 3) electronic chemical method: chromium metal, under DC Electric Field, migrates to ate electrode, then removed by other method, energy consumption is larger; 4) phytoremediation: plant is little, processing speed is slow, and plant tall and big heavy metal tolerance is poor; 5) microorganism remediation method: timeliness is slow, condition of culture is harsh, and microorganism difficulty survives.Monotechnics has its limitation, cannot be promoted in actual applications.
Bipolar Membrane is a kind of novel ion-exchange composite membranes, utilize Bipolar membrane water splitting to repair chromium-polluted soil, there is current efficiency and electric slot space utilization rate is high, electrode surface side reaction is few, energy consumption is low, without the need to additional a large amount of acid solution, do not produce the advantages such as secondary pollution.The general principle that Bipolar membrane water splitting removes Chromium in Soil is that Bipolar Membrane is under DC electric field effect, in intermediate layer, water dissociates, (event is without the need to outer acid supplemented solution to generate hydrogen ion continually, can not large amount of sewage be produced) and hydroxide ion, hydrogen ion to enter in soil chamber the trivalent chromium cation wash-out in soil out through the anode membrane layer of Bipolar Membrane, by wash-out chromium ion out under electric field action, enter metal ion room; The hydroxide ion of Bipolar Membrane intermediate layer water decomposition generation simultaneously, hydroxide ion enters another soil chamber through the cavity block layer of Bipolar Membrane, simultaneously, in this soil chamber, Cr VI anion anode moves, metal ion room is entered through anion-exchange membrane, thus the object that the trivalent chromic ion reached in soil and hexavalent chromium are removed simultaneously.Heavy metal ion is easy to wash-out, migration and removing from soil under hydrogen ion wash-out and electric field action, and the method that applying double pole membrane technology removes Chromium in Soil is combined at elution method and electronic chemical method, and both's advantage, overcomes its shortcoming.The utility model also can be used for the removal of chromium in mud, chromium slag and other solid waste.
Summary of the invention
The utility model provides a kind of membrane technology of applying double pole safely and effectively to remove the electrolytic cell of different valence state chromium in soil.This electrolytic cell utilizes Bipolar membrane water splitting to remove trivalent chromium in soil and Cr VI simultaneously, elution method and electronic chemical method is combined, and after process, Chromium in Soil content significantly reduces, and does not produce secondary pollution.
One involved by the utility model can remove trivalent chromium and chromic electrolytic cell in soil simultaneously, for cuboid channel-shaped structure, by anode in electrolytic cell, anion-exchange membrane and negative electrode sequential form, and be naturally divided into anode chamber and cathode chamber, anode and negative electrode are connected with the positive and negative polarities of dc source respectively, it is characterized in that between anode and anion-exchange membrane, being provided with 1 ~ 3 group by anion-exchange membrane, the soil treatment unit that Bipolar Membrane and cation-exchange membrane are formed, thus electrolytic cell is divided into anode chamber (metal ion room), soil treatment unit and cathode chamber, it is soil chamber between Bipolar Membrane and anion-exchange membrane.Wherein said soil treatment unit includes two soil chamber arranged side by side and metal ion room.
Described Bipolar Membrane is specific ion exchange membrane, and it is by anode membrane layer and the compounded anions and canons composite membrane of cavity block layer.
Described Bipolar Membrane, is also provided with capillary ceramic plate at the side surface towards soil chamber.
Described cation-exchange membrane and anion-exchange membrane, be also provided with capillary ceramic plate in the side towards soil chamber.
Described multiple soil treatment unit be made up of anion-exchange membrane, Bipolar Membrane and cation-exchange membrane, as 1 ~ 3, formation two ends is anode chamber (or metal ion room) and cathode chamber, and centre is in-line soil chamber, soil chamber, metal ion room ... soil chamber, soil chamber, metal ion room ... chamber structure.
Bipolar Membrane in above-mentioned electrolytic cell is under DC electric field effect, in intermediate layer, water dissociates, the hydrogen ion generated enters in soil chamber through Bipolar Membrane anode membrane layer, the trivalent chromium cation wash-out in soil out, by wash-out trivalent chromium cation out under electric field action, enter metal ion room; The hydroxide ion that Bipolar Membrane intermediate layer water decomposition produces simultaneously enters in another soil chamber through Bipolar Membrane cavity block layer, displacement Cr VI anion anode moves, enter metal ion room through anion-exchange membrane, thus the trivalent chromic ion in soil and hexavalent chromium are removed simultaneously.
The advantage that the utility model has and good effect are: 1, Bipolar Membrane is under DC electric field effect, and in intermediate layer, water dissociates and produces hydrogen ion and hydroxide ion, without the need to outer acid adding or other anion, have saved cost, reduce the generation of sewage.2, under hydrogen ion wash-out and electric field action, wash-out, migration and removing from soil is easy to by wash-out trivalent chromium cation out.3, simultaneously Cr VI anion is easy to wash-out, migration and removing from soil under hydroxide ion displacement and electric field action.4, can connect, thus improve current efficiency and electric slot space utilization rate, minimizing electrode surface side reaction generation, reduction energy consumption and cost.
Accompanying drawing explanation
Fig. 1 is the cell construction schematic diagram that a kind of applying double pole membrane technology described in the utility model removes Chromium in Soil.
Fig. 2 is the cell construction schematic diagram that a kind of applying double pole membrane technology arranging multiple soil treatment unit described in the utility model removes Chromium in Soil.
Detailed description of the invention
For content of the present utility model, Characteristic can be understood further, hereby by reference to the accompanying drawings, elaborate by way of example.
In Fig. 1, Fig. 2: 1 is electrolytic cell; 2 is anodes; 3 is Bipolar Membrane; 4 is capillary ceramic plates; 5 is anion-exchange membranes; 6 is cation-exchange membranes; 7 is negative electrodes; I is anode chamber; II is soil chamber; III is metal ion room; IV is cathode chamber.
Embodiment 1
Adopt a kind of applying double pole membrane technology as shown in Figure 1 to remove the electrolytic cell of Chromium in Soil, 2 soil chamber separate with Bipolar Membrane, and soil chamber and metal ion room amberplex separate, and separate in addition between soil and film with capillary ceramic plate.Anode and negative electrode are connected with the positive and negative polarities of dc source respectively.
Containing heavy metals such as total Cr, Pb, Fe, Mn, Mg, Ca in soil handled by the present embodiment, voltage gradient is 1.0V/m, and electrode spacing is 18cm, and system runs 5d continuously.The Na with 0.5mol/L is all added in anode chamber and cathode chamber
2sO
4solution is as supporting electrolyte, and its liquid level is concordant with soil, and before and after soil treatment, chromium content is in table 1.
Table 1: chromium content (mg/Kg) before and after soil treatment
Note: be followed successively by soil chamber 1,2 to negative electrode by anode.
Embodiment 2
A kind of applying double pole membrane technology that multiple soil treatment unit is set as shown in Figure 2 is adopted to remove the electrolytic cell of Chromium in Soil, neighboring soil room separates with Bipolar Membrane, soil chamber and metal ion room amberplex separate, separate with capillary ceramic plate between soil and film in addition, 2 soil treatment units alternately series connection.Anode and negative electrode are connected with the positive and negative polarities of dc source respectively.
Containing heavy metals such as total Cr, Pb, Fe, Mn, Mg, Ca in soil handled by the present embodiment, voltage gradient is 1.0V/m, and electrode spacing is 36cm, and system runs 5d continuously.The Na with 0.5mol/L is all added in anode chamber and cathode chamber
2sO
4solution is as supporting electrolyte, and its liquid level is concordant with soil, and before and after soil treatment, chromium content is in table 2.
Table 2: chromium content (mg/Kg) before and after soil treatment
Note: be followed successively by soil chamber 1,2,3,4 to negative electrode by anode.
Embodiment 3
A kind of applying double pole membrane technology that multiple soil treatment unit is set as shown in Figure 2 is adopted to remove the electrolytic cell of Chromium in Soil, neighboring soil room separates with Bipolar Membrane, soil chamber and metal ion room amberplex separate, separate with capillary ceramic plate between soil and film in addition, 2 soil treatment units alternately series connection.Anode and negative electrode are connected with the positive and negative polarities of dc source respectively.
Containing heavy metals such as total Cr, Pb, Fe, Mn, Mg, Ca in soil handled by the present embodiment, voltage gradient is 1.0V/m, and electrode spacing is 36cm, and system runs 4d continuously.The Na with 0.5mol/L is all added in anode chamber and cathode chamber
2sO
4solution is as supporting electrolyte, and its liquid level is concordant with soil, and before and after soil treatment, chromium content is in table 3.
Table 3: chromium content (mg/Kg) before and after soil treatment
Note: be followed successively by soil chamber 1,2,3,4 to negative electrode by anode.
Embodiment 4
A kind of applying double pole membrane technology that multiple soil treatment unit is set as shown in Figure 2 is adopted to remove the electrolytic cell of Chromium in Soil, neighboring soil room separates with Bipolar Membrane, soil chamber and metal ion room amberplex separate, separate with capillary ceramic plate between soil and film in addition, 2 soil treatment units alternately series connection.Anode and negative electrode are connected with the positive and negative polarities of dc source respectively.
Containing heavy metals such as total Cr, Pb, Fe, Mn, Mg, Ca in soil handled by the present embodiment, voltage gradient is 1.0V/m, and electrode spacing is 36cm, and system runs 6d continuously.The Na with 0.5mol/L is all added in anode chamber and cathode chamber
2sO
4solution is as supporting electrolyte, and its liquid level is concordant with soil, and before and after soil treatment, chromium content is in table 4.
Table 4: chromium content (mg/Kg) before and after soil treatment
Note: be followed successively by soil chamber 1,2,3,4 to negative electrode by anode.
Claims (4)
1. the electrolytic cell of an applying double pole membrane technology removal Chromium in Soil, for cuboid channel-shaped structure, by anode in electrolytic cell, anion-exchange membrane and negative electrode sequential form, and be naturally divided into anode chamber and cathode chamber, anode and negative electrode are connected with the positive and negative polarities of dc source respectively, it is characterized in that between anode and anion-exchange membrane, being provided with 1 ~ 3 group by anion-exchange membrane, the soil treatment unit that Bipolar Membrane and cation-exchange membrane are formed, thus electrolytic cell is divided into anode chamber, soil treatment unit and cathode chamber, it is soil chamber between Bipolar Membrane and anion-exchange membrane, wherein said soil treatment unit includes two soil chamber arranged side by side and metal ion room.
2. a kind of applying double pole membrane technology according to claim 1 removes the electrolytic cell of Chromium in Soil, and it is characterized in that described Bipolar Membrane is specific ion exchange membrane, it is by anode membrane layer and the compounded yin, yang composite membrane of cavity block layer.
3. a kind of applying double pole membrane technology according to claim 1 removes the electrolytic cell of Chromium in Soil, it is characterized in that described Bipolar Membrane, is also provided with capillary ceramic plate at the side surface towards soil chamber.
4. a kind of applying double pole membrane technology according to claim 1 removes the electrolytic cell of Chromium in Soil, it is characterized in that described anion-exchange membrane, is also provided with capillary ceramic plate in the side towards soil chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520549175.8U CN205085146U (en) | 2015-07-27 | 2015-07-27 | Use bipolar membrane technology and get rid of electrolysis trough of chromium in soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520549175.8U CN205085146U (en) | 2015-07-27 | 2015-07-27 | Use bipolar membrane technology and get rid of electrolysis trough of chromium in soil |
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|---|---|
| CN205085146U true CN205085146U (en) | 2016-03-16 |
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|---|---|---|---|
| CN201520549175.8U Withdrawn - After Issue CN205085146U (en) | 2015-07-27 | 2015-07-27 | Use bipolar membrane technology and get rid of electrolysis trough of chromium in soil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104959377A (en) * | 2015-07-27 | 2015-10-07 | 福建师范大学 | Electrolytic tank for removing chromium in soil by use of bipolar membrane technology |
-
2015
- 2015-07-27 CN CN201520549175.8U patent/CN205085146U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104959377A (en) * | 2015-07-27 | 2015-10-07 | 福建师范大学 | Electrolytic tank for removing chromium in soil by use of bipolar membrane technology |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160316 Effective date of abandoning: 20171107 |
|
| AV01 | Patent right actively abandoned |