CN1331619C - Cathode acidifying electric power repairing process for heavy metal contaminated soil - Google Patents
Cathode acidifying electric power repairing process for heavy metal contaminated soil Download PDFInfo
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- CN1331619C CN1331619C CNB2005100318636A CN200510031863A CN1331619C CN 1331619 C CN1331619 C CN 1331619C CN B2005100318636 A CNB2005100318636 A CN B2005100318636A CN 200510031863 A CN200510031863 A CN 200510031863A CN 1331619 C CN1331619 C CN 1331619C
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Abstract
The present invention discloses an electrodynamic technology for restoring heavy metal contaminated soil by acidifying cathodes. The present invention comprises the steps that ionized water is added into soil which is naturally dried and decontaminated, and the ionized water and the soil are stirred and statically placed; the treated contaminated soil is put into a soil chamber of an electrodynamic restoring device; then, electrolyte is poured in electrolysis chambers of all electrodes, and constant direct current is supplied to the electrolysis chambers; heavy metals in the contaminated soil are continuously absorbed from the soil in the process of restoration, and are removed from the soil under the action of an electric field, so the heavy metal contaminated soil is treated. The technology of the present invention has the advantages of short restoring time, easy operation, high heavy metal removing rate, etc., and has obvious economical benefit and social benefit.
Description
Technical field
The present invention relates to the renovation technique of heavy-metal contaminated soil, particularly the cathode acidifying electric power repairing process of heavy-metal contaminated soil.
Background technology
The soil heavy metal combined pollution that dirty filling and other mankind's activity cause is greatly threatening farmland ecosystem and human beings'health.At present, the domestic and international improvement method of taking can reduce three classes: the first kind is a biological method, as the phytoremediation method, and the microorganism repairing method; Second class then is a physical method, as soil moved in to improve the original method, soil replacement method etc.; The 3rd class is a chemical method, as chemical fixation, chemical leaching etc.Existing these restorative procedures all have certain limitation:
(1), phytoremediation method: repair process is slow, and nature such as soil fertility, weather, moisture, salinity, draining and irrigation system and artificial condition are had certain requirement.The super accumulation plant that is used to clear up heavy-metal contaminated soil is short and small usually, biomass is low, poor growth, growth cycle are long, thereby remediation efficiency is low, is unfavorable for the mechanization operation.
(2), microorganism repairing method: the same restriction degree of artificial and natural cause factor of influence that is subjected to phytoremediation is bigger.
(3), soil moved in to improve the original, soil replacement method: quantities is big, and the expense height only is suitable for situation small size, that soil pollution is serious.Simultaneously, the polluter taking-up also can not be produced certain risk to environment.
(4), chemical fixation: be fixed on heavy metal in the soil when environmental condition changes, still can from soil, discharge, become biological effectively form.In addition, the use of modifying agent will change soil texture to a certain extent, also may produce certain influence to edaphon simultaneously.
(5), chemical leaching method: the chemical complexing agent is easy to generate problems such as secondary pollution because cost an arm and a leg, and also is not suitable for the pollution soil body of density simultaneously.
Summary of the invention
Technical problem to be solved by this invention is a, problem such as running cost high, remediation efficiency low long at the repair time that exists in the prior art, a kind of cathode acidifying electric power restorative procedure of contaminated soil is provided, to reach under the lower running cost in the short reparation period, improve removal rate of heavy metal in the contaminated soil, this method is adapted to the removal of the heavy metal in compact substance and the low waterpower osmosis rate soil especially.
The concrete steps of heavy-metal contaminated soil cathode acidifying electric power restorative procedure of the present invention are as follows:
(1), with the contaminated soil gathered through natural air drying, behind the decontamination, remove through sieve greater than the particulate of 2mm, particle diameter less than the part of 2mm for further usefulness.
(2), by soil: water (mass ratio)=1.5～2: 1 adds deionized water in the soil, and mud leaves standstill 7～10 days to reach the equiblibrium mass distribution of pollutant then with electric mixer mechanical agitation 2～4 hours.
(3), pack into the soil chamber of electric power prosthetic device of the soil after will handling, with filter paper soil and electrolyte are separated, filter paper is fixed with support, then with each utmost point electrolyte input tank house.After treating each utmost point electrolyte input tank house, device was left standstill 1～2 hour.
(4), prosthetic device is fed direct current, be a constant and complicated current boundary environment is minimized that this restorative procedure adopts constant current output for guaranteeing the cell reaction net velocity, current density is controlled at 0.1～5mA/cm
2
(5), the electrolyte in each utmost point electrolyte deposit chamber is imported each utmost point tank house by peristaltic pump, its pump discharge is controlled at 0.5～5mL/min, with the loss of electrolyte in the compensation cell reaction.
(6), regularly measure and be pumped into the electrolyte of each utmost point tank house and from each utmost point tank house spout hole, flow out and be collected into the volume of the electrolyte of gatherer, and be calculated as follows the EOF volume, as one moment of back V
E-oCalculated value and previous moment V
E-oThe difference of calculated value be 0 o'clock, stop repairing.
In the formula:
V
E-o: EOF volume, mL;
V
1: be pumped into the volume of the electrolyte of anode electrolysis chamber, mL;
V
2: the volume of the electrolyte that the anode spout hole overflows, mL;
V
3: be pumped into the volume of the electrolyte of catholyte chamber, mL;
V
4: the volume of the electrolyte that the negative electrode spout hole overflows, mL.
If V
E-oFor just, then the EOF direction is to negative electrode from anode; Otherwise it is then anti-.
Among the present invention, anolyte adopts the H of 0.0025mol/L
2SO
4, catholyte adopts 0.25mol/LH
2SO
4Negative electrode adopts 0.25mol/LH
2SO
4Reason be: the H of higher concentration
+Can in and the OH that produces in the catholyte process
-Thereby, prevent heavy metal and OH
-Form precipitation.
Characteristics of the present invention are that (1) heavy metal ion can be to cathodic migration and accumulation under electric field.(2) electrode reaction produces a large amount of H at anode
+, anode near zone soil pH is descended, the desorb that this has promoted the dissolving of heavy metal in soil and has been adsorbed heavy metal ion has improved the quantity of heavy metal of soluble state and the mobility of heavy metal, thereby has helped the greater number heavy metal to cathodic migration.(3) H of catholyte 0.25mol/L
2SO
4Has very high H
+Concentration, can in and the OH that produces in the catholyte course of reaction
-, stoped OH
-Form precipitation of hydroxide with heavy metal ion, improved concentration of heavy metal ion in the soil pore water.(4) positive EOF helps repairing, otherwise then anti-.This method is by formula
Situation of change to the EOF volume is monitored in real time, determines the moment that termination is repaired according to its calculated value, has farthest utilized the favorable positive EOF of counterweight metal removal.
Description of drawings
Fig. 1 is prosthetic device figure of the present invention.
1 is dc source among Fig. 1, and 2 is that (φ * L=28 * 250mm), 3 is anolyte to graphite electrode, 4 is catholyte, and 5 is the anode electrolysis chamber, and 6 is catholyte chamber, 7 are anolyte deposit chamber, 8 are catholyte deposit chamber, and 9 is filter paper, and 10 is soil chamber (L * W * H=15cm * 10cm * 10cm), 11 is the electrolyte gatherer, 12 is support, and 13 is spout hole, and 14 is peristaltic pump.
The specific embodiment
1 further specify embodiments of the present invention in conjunction with the accompanying drawings.
Embodiment 1:
(1), will contain the contaminated soil natural air drying of cadmium 1490mg/kg, behind the decontamination, remove through sieve greater than the particulate of 2mm, particle diameter less than the part of 2mm for further usefulness.
(2), by soil: water (mass ratio)=2: 1 adds deionized water in the soil, and mud will leave standstill 7 days to reach the equiblibrium mass distribution of pollutant then with electric mixer mechanical agitation 3 hours.
(3), pack into the soil chamber 10 (height flushes with the spout hole height, is 10cm) of prosthetic device of the soil after will handling, with filter paper 9 soil and electrolyte are separated, filter paper usefulness support 12 is fixed.H with 600mL 0.0025mol/L
2SO
4Anolyte 3 injects anode electrolysis chamber 5, simultaneously with 900mL 0.25mol/L H
2SO
4Catholyte 4 injects catholyte chamber 6, leaves standstill afterwards 1 hour.
(4), prosthetic device is fed direct current, current density is 0.5mA/cm
2,, separate the H that generates in the reaction at positive electricity to impel the anti-life of electrode reaction
+Make the continuous desorb of the cadmium that is adsorbed in the soil, and under effect of electric field to cathodic migration.
(5), with the electrolyte in each utmost point electrolyte deposit chamber 7,8 by peristaltic pump 14 each utmost point tank house 5,6 of input, its pump discharge is 1mL/min, with the loss of electrolyte in the compensation cell reaction.
(6), regularly measure and be pumped into the electrolyte of each utmost point tank house and the volume that from each utmost point tank house spout hole, flows out and be collected into the electrolyte of gatherer 11, and by formula
Calculate the EOF volume change, as one moment of back V
E-oCalculated value and previous moment V
E-oThe difference of calculated value be 0 o'clock, stop repairing.After through 4.5 days, the cadmium clearance reaches 79% in the soil.
(1), with the contaminated soil natural air drying of leaded 1610mg/kg, behind the decontamination, remove through sieve greater than the particulate of 2mm, particle diameter less than the part of 2mm for further usefulness.
(2), by soil: water (mass ratio)=1.8: 1 adds deionized water in the soil, and mud will leave standstill 8 days to reach the equiblibrium mass distribution of pollutant then with electric mixer mechanical agitation 4 hours.
(3), with (3) among the embodiment 1.
(4), prosthetic device is fed direct current, current density is 0.4mA/cm
2,, separate the H that generates in the reaction at positive electricity to impel the anti-life of electrode reaction
+Make the plumbous constantly desorb that is adsorbed in the soil, and under effect of electric field to cathodic migration.
(5), with the electrolyte in each utmost point electrolyte deposit chamber 7,8 by peristaltic pump 14 each utmost point tank house 5,6 of input, wherein the anode pump discharge is 0.6mL/min, the negative electrode pump discharge is 1mL/min; Loss with electrolyte in the compensation cell reaction.
(6), regularly measure and be pumped into the electrolyte of each utmost point tank house and the volume that from each utmost point tank house spout hole, flows out and be collected into the electrolyte of gatherer 11, and by formula
Calculate the EOF volume change, as one moment of back V
E-oCalculated value and previous moment V
E-oThe difference of calculated value be 0 o'clock, stop repairing.After through 6.5 days, plumbous clearance reaches 66% in the soil.
Claims (2)
1, a kind of heavy-metal contaminated soil cathode acidifying electric power restorative procedure is characterized in that concrete steps are:
(1), with the contaminated soil gathered through natural air drying, behind the decontamination, remove through sieve greater than the particulate of 2mm, particle diameter less than the part of 2mm for further usefulness;
(2), by mass ratio soil: water=1.5～2: 1 adds deionized water in the soil, and mud leaves standstill 7～10 days to reach the equiblibrium mass distribution of pollutant then with electric mixer mechanical agitation 2～4 hours;
(3), pack into the soil chamber of electric power prosthetic device of the soil after will handling, with filter paper soil and electrolyte are separated, filter paper is fixed with support; Then with each utmost point electrolyte input tank house; After treating each utmost point electrolyte input tank house, device was left standstill 1～2 hour;
(4), prosthetic device is fed direct current, be a constant and complicated current boundary environment is minimized that this restorative procedure adopts constant current output for guaranteeing the cell reaction net velocity, current density is controlled at 0.1～5mA/cm
2
(5), the electrolyte in each utmost point electrolyte deposit chamber is imported each utmost point tank house by peristaltic pump, its pump discharge is controlled at 0.5～5mL/min, with the loss of electrolyte in the compensation cell reaction;
(6), regularly measure and be pumped into the electrolyte of each utmost point tank house and from each utmost point tank house spout hole, flow out and be collected into the volume of the electrolyte of gatherer, and be calculated as follows the EOF volume, as one moment of back V
E-oCalculated value and previous moment V
E-oThe difference of calculated value be 0 o'clock, stop repairing;
In the formula:
V
E-o: EOF volume, mL;
V
1: be pumped into the volume of the electrolyte of anode electrolysis chamber, mL;
V
2: the volume of the electrolyte that the anode spout hole overflows, mL;
V
3: be pumped into the volume of the electrolyte of catholyte chamber, mL;
V
4: the volume of the electrolyte that the negative electrode spout hole overflows, mL.
2, heavy-metal contaminated soil cathode acidifying electric power restorative procedure according to claim 1 is characterized in that anolyte adopts the H of 0.0025mol/L
2SO
4, catholyte adopts 0.25mol/L H
2SO
4
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100318636A CN1331619C (en) | 2005-07-13 | 2005-07-13 | Cathode acidifying electric power repairing process for heavy metal contaminated soil |
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|---|---|---|---|
| CNB2005100318636A CN1331619C (en) | 2005-07-13 | 2005-07-13 | Cathode acidifying electric power repairing process for heavy metal contaminated soil |
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|---|---|
| CN1714955A CN1714955A (en) | 2006-01-04 |
| CN1331619C true CN1331619C (en) | 2007-08-15 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100429507C (en) * | 2006-04-29 | 2008-10-29 | 南京大学 | Experimental parameter investigating method for electric restoring polluted soil and groundwater |
| CN1899717B (en) * | 2006-07-07 | 2010-08-11 | 南开大学 | Process for united repairing heavy metal polluted soil by electric power and iron permeable reaction lattices |
| CN102580539B (en) * | 2012-02-27 | 2014-01-08 | 中国科学院南京土壤研究所 | Method for simulating natural acidification of soil |
| CN103011349B (en) * | 2012-12-28 | 2014-08-06 | 华北电力大学 | Device and method for repairing chromium contaminated underground water through electromotive force |
| CN103341485B (en) * | 2013-06-04 | 2015-08-26 | 孔亦周 | Adopt the Electrodynamic force method electrode of asphalt-base spherical activated carbon absorption soil pollutant |
| CN103962372B (en) * | 2014-05-20 | 2016-02-24 | 华北电力大学 | A kind of negative electrode approximatioss repairs device and the restorative procedure thereof of caesium contaminated soil |
| CN104353662A (en) * | 2014-10-20 | 2015-02-18 | 河海大学 | Electrokinetic soil heavy metal remedying reaction device |
| CN104550215A (en) * | 2014-12-18 | 2015-04-29 | 河海大学 | Method and equipment for electromagnetically remedying heavy metal contaminated soil |
| CN105665437B (en) * | 2016-04-05 | 2019-07-23 | 江南大学 | A kind of device using Electroremediation contaminated soil |
| CN106378357A (en) * | 2016-10-12 | 2017-02-08 | 北京建工环境修复股份有限公司 | Composite electrode for electro-kinetic remediation of heavy metal contaminated soil, electro-kinetic remediating device and electro-kinetic remediation method |
| CN106424107B (en) * | 2016-10-15 | 2022-08-16 | 太原理工大学 | Device for electrokinetic remediation of chromium slag stacking place by leaching nano zero-valent iron and nickel |
| CA3167469A1 (en) * | 2022-07-13 | 2024-01-13 | 12974533 Canada Inc. | A system and method for decontaminating soil using electrokinetics |
Citations (2)
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|---|---|---|---|---|
| US6191094B1 (en) * | 1997-05-06 | 2001-02-20 | Church & Dwight Co., Inc. | Aqueous cleaning composition for cleaning substrates and method of using same |
| JP2001340891A (en) * | 2000-06-01 | 2001-12-11 | Hideken Sekkei:Kk | Organic wastewater treatment apparatus |
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2005
- 2005-07-13 CN CNB2005100318636A patent/CN1331619C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6191094B1 (en) * | 1997-05-06 | 2001-02-20 | Church & Dwight Co., Inc. | Aqueous cleaning composition for cleaning substrates and method of using same |
| JP2001340891A (en) * | 2000-06-01 | 2001-12-11 | Hideken Sekkei:Kk | Organic wastewater treatment apparatus |
Non-Patent Citations (4)
| Title |
|---|
| 土壤－植物系统中重金属污染的治理途径及其研究展望 顾继光等，土壤通报，第36卷第1期 2005 * |
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