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Method for in-situ remediation of heavy metal hexavalent chromium-contaminated soil

A technology for in-situ remediation and contaminated soil, applied in the field of soil pollution remediation, can solve problems such as immature operation methods, and achieve the effects of low cost, high removal efficiency and good safety

Inactive Publication Date: 2015-01-07
东莞市环境科学研究所 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Most of the current public use of MFC to remediate pollution is aimed at the disposal of anode pollutants, mostly organic pollutant fuels that can be utilized by microorganisms, mainly including municipal sewage, organic wastewater discharged from factories, human and animal manure, etc. Pollutants, especially the heavy metal element hexavalent chromium, are rarely reported by MFC, and the operation method of using MFC to remove hexavalent chromium is immature

Method used

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  • Method for in-situ remediation of heavy metal hexavalent chromium-contaminated soil
  • Method for in-situ remediation of heavy metal hexavalent chromium-contaminated soil
  • Method for in-situ remediation of heavy metal hexavalent chromium-contaminated soil

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Effect test

Embodiment 1

[0032] Example 1 Determination of the optimum reaction pH value

[0033] The following experiments were designed to study the optimal pH conditions for the in-situ removal of hexavalent chromium in polluted soil by MFC: Mix the polluted soil and add it to a reactor with a length, width and height of 0.5m*0.5m*0.5m as a contaminated soil treatment unit According to the series connection, the anode group and the cathode group are respectively buried in the polluted soil and connected by wires. Adjust the pH range of the polluted soil to 2-7. The reaction was run at a constant temperature of 25±1°C for 6 days. During the measurement, randomly take soil samples from 3 parallel groups, mix them evenly, accurately weigh 5 g of the mixed soil samples, put them into a 100 ml beaker, add 50 ml of 0.4 mol / L KCl solution, stir electromagnetically for 5 min, and centrifuge (6500 rpm, 10 ~ 20 min) for separation, the supernatant was taken, and the concentration of hexavalent chromium re...

Embodiment 2

[0037] Embodiment 2 Determination of optimal reaction time

[0038] The following experiment was designed to study the optimal reaction time of MFC for in-situ removal of hexavalent chromium in polluted soil: mix the polluted soil and add it to a reactor with a length, width and height of 0.5m*0.5m*0.5m as contaminated soil treatment In the unit, the anode group and the cathode group are respectively buried in the polluted soil in series and connected by wires. Adjust the pH of the contaminated soil to 5. The reaction was run at a constant temperature of 25±1°C for 0–10 days. During the measurement, randomly take 3 soil samples and mix them evenly. Accurately weigh 5g of the mixed soil samples. As for the 100ml beaker, add 50ml of 0.4 mol / L KCl solution, electromagnetically stir for 5min, and centrifuge (6500 rpm, 10-20 min) Separate, take the supernatant, analyze the concentration of hexavalent chromium remaining in the aqueous solution by diphenylcarbazide spectrophotome...

Embodiment 3

[0042] Embodiment 3 Determination of optimum reaction temperature

[0043] The following experiments were designed to study the optimum reaction temperature for in-situ removal of hexavalent chromium in contaminated soil by MFC: the contaminated soil was mixed and added to a reactor whose length, width and height were 0.5m*0.5m*0.5m respectively as the contaminated soil In the processing unit, the anode group and the cathode group are respectively buried in the polluted soil in series and connected by wires. Adjust the pH of the contaminated soil to 5. The reaction was run at a constant temperature of 5-35°C for 6 days. During the measurement, randomly take 3 soil samples and mix them evenly. Accurately weigh 5g of the mixed soil samples. As for the 100ml beaker, add 50ml of 0.4mol / L KCl solution, electromagnetically stir for 5min, and centrifuge (6500rpm, 10-20min) Separate, take the supernatant, analyze the concentration of hexavalent chromium remaining in the aqueous so...

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Abstract

The invention discloses a method for the in-situ remediation of heavy metal hexavalent chromium-contaminated soil. According to the method, by using the advantages of a microbial fuel cell (MFC), an anode assembly and a cathode assembly (a diaphragm is arranged between the anode assembly and the cathode assembly) is embedded in the contaminated soil, the anode assembly locally utilizes organic matters in the soil as fuel, generated electronics reach the cathode assembly by virtue of anodes and leads, heavy metal hexavalent chromium adsorbed on the cathode assembly is reduced, and thus the degradation and the transformation of heavy metal hexavalent chromium contaminants in the soil are promoted, and the in-situ remediation of the heavy metal hexavalent chromium-contaminated soil is realized. By adopting an in-situ remediation process, the method has the advantages of high removal efficiency, low cost, good safety, no need of ventilation and energy consumption, capability of recycling and no secondary pollution because the anode assembly and the cathode assembly can be combined and optimized according to the actual conditions, has the great importance in remediating the heavy metal hexavalent chromium-contaminated soil, has a wide application prospect in fields of resources and environments such as the remediation of the heavy metal hexavalent chromium-contaminated soil, and the like.

Description

technical field [0001] The invention relates to a method for in-situ restoration of soil polluted by heavy metal hexavalent chromium, belonging to the field of soil pollution restoration. Background technique [0002] Chromium is one of the essential trace elements for animals and human body. Chromium mainly exists in the environment in two forms, Cr(III) and Cr(VI), and Cr(III) is relatively stable and less toxic than Cr(VI). With the rapid development of modern industry, the main production and processes that produce chromium pollution have involved many fields such as metallurgy, chemical industry, agriculture, and medicine. In the above-mentioned industrial production, "three wastes" containing chromium can be produced. A large amount of chromium enters the environment and remains in the environment for a long time, pollutes groundwater through geochemical processes, pollutes the entire ecosystem, especially agricultural ecosystems through biogeochemical processes, and ...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/10
Inventor 陶亮万开刘承帅吴对林李芳柏黄奂彦曾彩明
Owner 东莞市环境科学研究所
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