亚氨基二琥珀酸修复重金属污染土壤及环境风险削减评估

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Abstract Iminodisuccinic acid (ISA) was used as a washing agent to remove Cd, Pb, and Zn from polluted soil under the action of ISA concentration, pH, washing time, and soil-liquid ratio. A three-factor and three-level optimization model based on the Box-Behnken design method were established to determine the optimum washing conditions. The comprehensive environmental risk method involving the residual content, leaching concentration, and toxicity of heavy metals in soil was used to evaluate the washing remediation performance. Cd, Pb and Zn removal efficiencies increased with the increase of ISA concentration. They reached 11.83%, 34.26%, and 20.96% in mine soil and 48.89%, 57.08%, and 81.80% in polluted farmland soil, respectively, at the ISA concentration of 50mmol/L. By increasing contact time and the acidity of the washing solution, the Cd, Pb and Zn removal efficiencies were improved. They increased as the soil-liquid ratio decrease. The predicted maximum total removal rates of heavy metal in mine soil and contaminated farmland soil reached 32.58% and 93.16%, respectively, under the optimized conditions of ISA concentration of 70mmol/L, pH of 4.0, and reaction time of 120min. Under this condition, the surplus of heavy metal in the water-soluble, exchangeable, and carbonate bounding states decreased significantly, thus reducing the total environmental risks of heavy metal in mine soil and contaminated farmland soil by 50.81% and 87.13%. Iminodosuccinic acid could effectively remove heavy metals from contaminated soil and reduce the environmental risks of residual heavy metals and is a potential material for remediation of heavy metal-contaminated soil.

Key words： heavy metal-contaminated soil response surface optimization iminodisuccinic acid environmental risks leaching toxicity

Received: 02 March 2020

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X53

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	Articles by authors
	WANG Gui-yin
	ZHANG Shi-rong
	WU Xiao-yu
	LI Lun
	GUO Qi-qi
	LI Sen
	XU Xiao-xun
	LI Ting

Cite this article:

WANG Gui-yin,ZHANG Shi-rong,WU Xiao-yu等. Remediation of heavy metal contaminated soil by iminodisuccinic acid and assessment of environmental risk reduction[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(10): 4468-4478.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I10/4468

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