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| Removal of Cd from contaminated soil using amino acid salt |
| Received:July 20, 2020 |
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| KeyWord:soil washing;Cd;amino acid salt;enzyme activity |
| Author Name | Affiliation | E-mail | | JI Meng-meng | School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
Jiangsu Biomass Energy and Carbon Reduction Technology Engineering Laboratory, Wuxi 214122, China | | | WANG Xing-xing | School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
Jiangsu Biomass Energy and Carbon Reduction Technology Engineering Laboratory, Wuxi 214122, China | | | MA Huan-huan | School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
Jiangsu Biomass Energy and Carbon Reduction Technology Engineering Laboratory, Wuxi 214122, China | | | ZHANG Chang-bo | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | RUAN Wen-quan | School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
Jiangsu Biomass Energy and Carbon Reduction Technology Engineering Laboratory, Wuxi 214122, China | | | REN Hong-yan | School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
Jiangsu Biomass Energy and Carbon Reduction Technology Engineering Laboratory, Wuxi 214122, China | | | DENG Yun | School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
Jiangsu Biomass Energy and Carbon Reduction Technology Engineering Laboratory, Wuxi 214122, China | dengyun@jiangnan.edu.cn |
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| Abstract: |
| To reduce the impact of washing on soil, a[Gly] [H2PO4] salt was selected from among 12 different phosphoric acid salts for its higher removal percentage and low cost. The influence of operational conditions, including agent concentrations, extraction time, liquid to soil ratio, and pH, was investigated. The impact of washing on soil was also studied. The results indicated that when the agent concentration was 0.3 mol·L-1, the liquid/solid ratio was 4, the washing time was 60 min, and a Cd(Ⅱ)removal percentage of 55.4% could be achieved. The levels of organic matter, available K, total N, and total P in the soil increased after washing. The activity of soil dehydrogenase and glucosidase decreased at first, but increased by 61.3% and 37.3%, respectively, 28 days after washing. Addition of Ca(OH)2 to the washing effluent at a concentration of 20 g·L-1, achieved a 96.57% removal percentage of Cd, lower than the discharge requirements in Comprehensive Sewage Discharge Standard(GB 8978-1996)(<0.1 mg·L-1). This study suggests that[Gly] [H2PO4] can be considered as an environmental friendly washing agent for Cd(Ⅱ)contaminated soil. |
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