CN104259198B - A kind of method of the hexavalent chromium polluted soil of in-situ immobilization heavy metal - Google Patents
A kind of method of the hexavalent chromium polluted soil of in-situ immobilization heavy metal Download PDFInfo
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- CN104259198B CN104259198B CN201410460125.2A CN201410460125A CN104259198B CN 104259198 B CN104259198 B CN 104259198B CN 201410460125 A CN201410460125 A CN 201410460125A CN 104259198 B CN104259198 B CN 104259198B
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Abstract
The invention discloses a kind of method of the hexavalent chromium polluted soil of in-situ immobilization heavy metal.The present invention utilizes the advantage of microbiological fuel cell (MFC), by anode unit and cathode sets（It is provided with barrier film）It is embedded in contaminated soil, organic matter in anode unit local use soil is used as fuel, the electronics of generation reaches cathode sets by anode and wire, heavy metal Cr VI to adsorbing in cathode sets is reduced, so as to promote the degraded and conversion of heavy metal-polluted soil hexavalent chromium pollutant, the in-situ immobilization of Cr VI heavy-metal contaminated soil is realized.The present invention uses in-situ immobilization technique, with removal efficiency is high, low cost, security is good, consumed energy without ventilation, cathode sets and anode unit can be according to actual conditions come Combinatorial Optimization, it is reusable, the advantages of do not cause secondary pollution, it is significant to removing hexavalent chromium polluted soil, there is very wide application prospect in resource and environment fileds such as heavy metal pollution of soil improvement.
Description
Technical field
The present invention relates to a kind of method of the hexavalent chromium polluted soil of in-situ immobilization heavy metal, belong to soil pollution reparation neck
Domain.
Background technology
Chromium is one of animal and the necessary trace element of human body.Mainly there is ring with (VI) two kind of form of Cr (III) and Cr in chromium
In border, Cr (III) stablizes relatively compared to Cr (VI), and toxicity is also relatively small.With developing rapidly for modern industry, produce chromium dirty
The main production and technique of dye have been directed to the multiple fields such as metallurgy, chemical industry, agricultural, medical science, in above-mentioned industrial production, can produce
Raw " three wastes " containing chromium.Substantial amounts of chromium enters environment and extended residual is in environment, by geochemical process polluted underground water, leads to
Cross biogeochemical process and pollute the whole ecosystem, particularly Agro-ecological System, animals and human beingses are endangered by food chain
The health of class.
In current soil pollution recovery technique, soil in-situ reparation is subject in recent years because that can avoid secondary pollution problem
Strong interest.The soil restoring technology that various recovery techniques are combined together is turned into the main direction of studying of soil remediation,
Wherein propose in recent years be by the eco-chemical remediation technology new method that is combined with bioanalysis of chemistry 21st century contaminated soil repair
The developing direction of recovering technology.
Microbiological fuel cell（MFC）Can by various organic matters in anaerobism anode chamber by the microorganism with electro-chemical activity
Anaerobic oxidation, while electron transmission to cathode electronics acceptor is carried out into reduction constitutes a complete loops.The electrode of MFC is used as electricity
Sub- acceptor inserts electrode as low cost, easy care electronics to promote hexavalent chromium polluted reduction to provide a new thinking
Receiving body, the electronics that microbiological oxidation organic matter is produced is transferred to negative electrode by anode and external circuit and Cr VI reacts, plus
The deoxidization, degradation detoxification of fast negative electrode hexavalent chromium pollutant.
Advantage of the present invention using microbiological fuel cell (MFC) is gone back to the heavy metal Cr VI adsorbed in cathode sets
It is former.MFC devices include anode unit and cathode sets, are attached at the cathode sets and are provided with barrier film, are spaced from each other and are embedded in contaminated soil
And connected by wire.Anode unit and cathode sets are embedded in contaminated soil, control process conditions promote heavy metal-polluted soil sexavalence
The degraded and conversion of chromium pollutant, for the in-situ immobilization for realizing Cr VI heavy-metal contaminated soil provides a kind of method.
Presently disclosed utilization MFC repairs pollution and is directed to anode Disposal of Contaminants mostly, can mostly be utilized by microorganism
Organic pollution fuel, mainly including municipal wastewater, the organic wastewater of plant emissions, human and animal excreta etc., but for as electronics
The MFC reports of the cathode pollutant of acceptor, particularly heavy metal element Cr VI are less, and the operation of Cr VI is removed using MFC
Method prematurity.
The content of the invention
It is an object of the invention to provide a kind of method of the hexavalent chromium polluted soil of in-situ immobilization heavy metal.
The technical solution used in the present invention is：
A kind of method of the hexavalent chromium polluted soil of in-situ immobilization heavy metal, comprises the following steps：
1）The anode unit and cathode sets of microbiological fuel cell are spaced from each other and are embedded in hexavalent chromium polluted soil；
2）Anode unit and cathode sets are connected by wire；
3）Adjust the moisture content ＞ 3% of soil；
4）Regulation soil pH value is 2 ~ 7；
5）The regulation soil moisture is 15 ~ 35 DEG C；
6）It is more than 1 day to control the reaction time, you can.
Further, the pH value is 5.
Further, the temperature is 25~35 DEG C.
Further, the temperature is 25 DEG C.
Further, the reaction time is 5 to go up to the sky.
Further, the reaction time is 6 days.
The beneficial effects of the invention are as follows：
The present invention uses in-situ immobilization technique, and with removal efficiency is high, low cost, security is good, consumed energy without ventilation, cloudy
Pole group and anode unit can be reusable, the advantages of do not cause secondary pollution according to actual conditions come Combinatorial Optimization, to removing six
Valency chromium-polluted soil is significant, has very wide application preceding in resource and environment fileds such as heavy metal pollution of soil improvement
Scape.
Specific embodiment
A kind of method of the hexavalent chromium polluted soil of in-situ immobilization heavy metal, comprises the following steps：
1）The anode unit and cathode sets of microbiological fuel cell are spaced from each other and are embedded in hexavalent chromium polluted soil；
2）Anode unit and cathode sets are connected by wire；
3）The moisture content ＞ 3% of regulation treatment soil；
4）Regulation soil pH value is 2 ~ 7, and pH value is preferably 5；
5）The regulation soil moisture is 15 ~ 35 DEG C, most preferably preferably 25~35 DEG C, 25 DEG C；
6）It is more than 1 day to control the reaction time, and preferably 5 to go up to the sky, most preferably 6 days, you can.
With reference to specific embodiment, the present invention is further illustrated, but is not limited thereto.
Regulation in standard of soil environment quality (GB 15618-1995), the slight pollution of Chromium in Soil, intermediate pollution and weight
The initial value for spending pollution is respectively 90,150,300 mg/kg.In all examples below gather pedotheque in total chromium and
Content of 6-valence Cr ions is respectively 6.2 × 103Mg/kg and 3.4 × 103Mg/kg, belongs to serious pollution, and moisture content is 3%.
The determination of the optimum response pH value of embodiment 1
Devise the Optimal pH condition of Cr VI in following experimental study MFC removing contaminated soils in situ：By contaminated soil
Mix and add length, width and height to be respectively in the reactor of 0.5m*0.5m*0.5m as contaminated soil processing unit, according to series system
Anode unit and cathode sets are embedded in contaminated soil respectively, are connected by wire.The pH value range for adjusting contaminated soil is 2 ~ 7.
Reaction was in 25 ± 1 DEG C of constant temperature continuous services 6 days.During measure, 3 pedotheques of parallel group are taken at random, mixed, accurately weigh mixed
Even pedotheque 5g, as in 100ml beakers, adds 0.4mol/L KCl solution 50ml, electromagnetic agitation 5min, is centrifuged (6500
Rpm, 10~20 min) separate, supernatant is taken, remaining Cr VI is dense in the diphenyl carbazide spectrophotometry analysis aqueous solution
Degree, calculates Cr VI removal efficiency（It is shown in Table 1）.
Cr VI removal efficiency (%) under the condition of different pH of table 1
Result shows in table 1, and Cr VI is respectively provided with preferably in the method removing contaminated soil in the range of pH 2 ~ 7
Treatment effect.But when pH is 5, the percent reduction highest of chromium (VI)（94.29%）It is substantially better than the percent reduction under the conditions of other pH.
The determination of the optimum reacting time of embodiment 2
Following experiment is devised to study the optimum reacting time of Cr VI in MFC removing contaminated soils in situ：Will pollution
Soil is mixed and adds length, width and height to be respectively in the reactor of 0.5m*0.5m*0.5m as contaminated soil processing unit, according to series connection
Be embedded in contaminated soil for anode unit and cathode sets respectively by mode, is connected by wire.The pH value for adjusting contaminated soil is 5.Instead
Should be in 25 ± 1 DEG C of constant temperature continuous services 0 ~ 10 day.During measure, 3 samples-soil sample blendings are taken at random, accurately weigh mixing soil
Earth sample 5g, as in 100ml beakers, adds 0.4 mol/L KCl solution 50ml, electromagnetic agitation 5min, is centrifuged (6500
Rpm, 10~20 min) separate, supernatant is taken, remaining Cr VI is dense in the diphenyl carbazide spectrophotometry analysis aqueous solution
Degree, calculates Cr VI removal efficiency（It is shown in Table 2）.
Cr VI removal efficiency (%) under the different desorption times of table 2
Result shows in table 2, and reaction can substantially remove the content of 6-valence Cr ions in soil after 1 day（Removal efficiency is up to 15%）, when anti-
When reaching more than 5 days between seasonable, major part Cr VI is can remove（Removal efficiency is up to more than 77%）, removal efficiency after especially reacting 6 days
Up to 94.29%, the growth rate of removal efficiency is slow after reacting 6 days, therefore optimum reacting time is 6 days, it is seen that the method is in situ
Removing soil Cr VI is rapidly and efficiently.
The determination of the optimal reaction temperature of embodiment 3
Following experiment is devised to study the optimal reaction temperature of Cr VI in MFC removing contaminated soils in situ：Will pollution
Soil is mixed and adds length, width and height to be respectively as contaminated soil processing unit in the reactor for 0.5m*0.5m*0.5m, according to string
Be embedded in contaminated soil for anode unit and cathode sets respectively by connection mode, is connected by wire.The pH value for adjusting contaminated soil is 5.
Reaction was in 5 ~ 35 DEG C of constant temperature continuous services 6 days.During measure, 3 samples-soil sample blendings are taken at random, accurately weigh mixing soil
Sample 5g, as in 100ml beakers, adds 0.4mol/L KCl solution 50ml, electromagnetic agitation 5min, and (6500 rpm, 10 are centrifuged
~20 min) separate, supernatant is taken, remaining hexavalent chromium concentration, meter in the diphenyl carbazide spectrophotometry analysis aqueous solution
Calculate Cr VI removal efficiency（It is shown in Table 3）.
Cr VI removal efficiency (%) under the different desorption temperatures of table 3
Result shows in table 3, in higher temperature（25~35 DEG C）, Cr VI has in MFC removing contaminated soils in situ
Preferable treatment effect, but between 25~35 DEG C, the treatment effect of Cr VI is not bright in MFC removing contaminated soils in situ
Significant difference is different, and the preferable temperature for illustrating MFC removing contaminated soil Cr VIs in situ is 25~35 DEG C.
Embodiment 4
A kind of method of the hexavalent chromium polluted soil of in-situ immobilization heavy metal, comprises the following steps：
1）The anode unit and cathode sets of microbiological fuel cell are spaced from each other and are embedded in hexavalent chromium polluted soil；
2）Anode unit and cathode sets are connected by wire；
3）The moisture content ＞ 3% of regulation treatment soil；
4）Regulation soil pH value is 5；
5）The regulation soil moisture is 25 DEG C；
6）Successive reaction 6 days, you can.
Repeatability detection
Following experiment is devised to study the reuse effect of Cr VI in MFC removing contaminated soils in situ：
It is 0.5m*0.5m* that contaminated soil is mixed addition length, width and height and is respectively according to the operating method in above-described embodiment 4
As contaminated soil processing unit in the reactor of 0.5m, anode unit and cathode sets are embedded in Polluted Soil respectively according to series system
In earth, connected by wire；The moisture content for adjusting contaminated soil soil is 3%, and pH value is 5,25 ± 1 DEG C of constant temperature continuous services 6
My god.During measure, 3 pedotheques are taken at random and is mixed, accurately weigh mixing pedotheque 5g, as in 100ml beakers, add
0.4mol/L KCl solution 50ml, electromagnetic agitation 5min, centrifugation (6500 rpm, 10~20 min) are separated, and take supernatant, hexichol
Remaining hexavalent chromium concentration in the hydrazine spectrophotometric analysis aqueous solution of phosphinylidyne two, calculates Cr VI removal efficiency, uses 0.5 M
Reused after the Cr VI of EDTA wash-out cathode electrode absorption.In above-mentioned same method, carry out that experiment is repeated several times, as a result
As shown in table 4.As can be seen from Table 4, same MFC devices have repeatability well by operating method of the invention.
Table 4 reuses the removal efficiency (%) of lower Cr VI
Claims (1)
1. a kind of method of the hexavalent chromium polluted soil of in-situ immobilization heavy metal, it is characterised in that：Comprise the following steps：
1）The anode unit and cathode sets of microbiological fuel cell are spaced from each other and are embedded in hexavalent chromium polluted soil；
2）Anode unit and cathode sets are connected by wire；
3）The moisture content of regulation treatment soil is 3%；
4）Regulation soil pH value is 5；
5）The regulation soil moisture is 25 DEG C；
6）Successive reaction 6 days, you can.
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| CN201410460125.2A CN104259198B (en) | 2014-09-11 | 2014-09-11 | A kind of method of the hexavalent chromium polluted soil of in-situ immobilization heavy metal |
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| CN108704933B (en) * | 2018-04-26 | 2020-09-11 | 中国石油大学(北京) | Device and method for in-situ remediation of hexavalent chromium contaminated soil |
| CN111659729A (en) * | 2020-05-27 | 2020-09-15 | 北京化工大学 | Method for restoring chromium-polluted soil by Shewanella |
| CN113415857B (en) * | 2021-06-11 | 2023-02-10 | 安徽工业大学 | Method for harmless treatment of hexavalent Cr wastewater by adsorption and electroreduction through carbon paste electrode |
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| US6145244A (en) * | 1998-12-11 | 2000-11-14 | Lynntech, Inc. | Methods for enhancing phytoextraction of contaminants from porous media using electrokinetic phenomena |
| CN101710625B (en) * | 2009-10-30 | 2012-07-25 | 北京大学深圳研究生院 | Fuel cell system and method of generating electricity and reducing heavy metal through sewage treatment |
| CN202025824U (en) * | 2011-03-15 | 2011-11-02 | 广东省生态环境与土壤研究所 | Soil microorganism fuel cell installation for in-situ remediation of organically polluted soil |
| CN102412409B (en) * | 2011-09-30 | 2013-08-28 | 中国科学院广州能源研究所 | Microbial fuel battery device based on the soil organic matter |
| CN103975788B (en) * | 2014-04-24 | 2016-01-20 | 浙江工商大学 | Potted plant and the method for the microbiological fuel cell of in-situ immobilization is polluted for soil Cr |
| CN103966626B (en) * | 2014-04-29 | 2016-03-02 | 大连理工大学 | A kind of microbiological fuel cell that improves drives microorganism electrolysis cell to reclaim polymetallic method |
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