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| Effects of different applications of soil remediation agents on heavy-metal stabilization in contaminated soil |
| Received:May 23, 2019 |
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| KeyWord:remediation agents;application methods;heavy metal;immobilization;soil pollution |
| Author Name | Affiliation | E-mail | | MI Shen-shen | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | XIAO Ran | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | WANG Jiao | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | LI Rong-hua | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | ZHANG Zeng-qiang | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | zhangzq58@126.com |
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| Abstract: |
| In this study, lime, bentonite, zeolite, bone powder, sodium sulfide, and ferrous sulfate were used to immobilize heavy metals in contaminated soil using different methods and at optimal application rates. The results revealed the following:lime had the greatest effect on Cd immobilization, bentonite and bone powder optimized Pb immobilization, and ferrous sulfate had the greatest effects on Zn immobilization in Tongguan and Feng County soils. However, the degrees of soil heavy metal immobilization differed according to the form of the remediation agents. Lime in liquid-liquid form had the greatest effect on Cd immobilization in both Tongguan and Feng County soils; the content of available Cd reduced by 87.9% and 70.8%, respectively. Bentonite and bone powder in a solid-liquid form had sound effects on Pb stabilization in both soils. Metals in the residual state increased by 59.0% and 56.3% for Tongguan and Feng County soils, respectively. Furthermore, the application of ferrous sulfate in the solid-liquid and liquid-liquid form optimized Zn immobilization in Tongguan and Feng County soils with the available Zn content reduced by 87.2% and 84.3%, respectively. |
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