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| Research on the remediation of heavy metal-contaminated water and soil by modified fly ash |
| Received:October 14, 2024 |
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| KeyWord:remediation of contaminated soil;fly ash;solid waste;heavy metal;passivator |
| Author Name | Affiliation | E-mail | | MAO Xiaoyu | Zhejiang Zheneng Technology & Environment Group Co., Ltd., Hangzhou 311199, China | | | CHANG Xinglan | Zhejiang Zheneng Technology & Environment Group Co., Ltd., Hangzhou 311199, China | | | LI Jinjun | School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China | lijinjun@whu.edu.cn | | WANG Runde | Zhejiang Zheneng Technology & Environment Group Co., Ltd., Hangzhou 311199, China | | | GU Yajie | Zhejiang Zheneng Technology & Environment Group Co., Ltd., Hangzhou 311199, China | | | SUN Ke | Zhejiang Zheneng Technology & Environment Group Co., Ltd., Hangzhou 311199, China | | | XI Shuang | Zhejiang Zheneng Technology & Environment Group Co., Ltd., Hangzhou 311199, China | | | XU Jiayu | Zhejiang Zheneng Technology & Environment Group Co., Ltd., Hangzhou 311199, China | |
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| Abstract: |
| Heavy metal contamination is one of the major water and soil environmental problems, and this study aimed to develop adsorbents and passivators from fly ash for the remediation of heavy metal pollution in water and soil. The material preparation methods included successive treatment of fly ash with acid and base to prepare so-called acid-base-treated fly ash, treatment of fly ash with base to prepare so-called base-treated fly ash, and preparation of reconstructed fly ash by extracting Al, Fe, and Si species from fly ash followed by condensation reaction. Modified fly ash had significantly enhanced porosity and more active sites. The adsorptive removal efficiency of Cd in water and the passivation efficiency of Cd in soil were significantly improved by acid-base-treated fly ash and base-treated one compared with the pristine fly ash. In the passivation remediation incubation experiment of Cd-contaminated soil, base-treated fly ash achieved a decrease of about 24% in the fraction of exchangeable Cd in soil within 7 days. In contrast, reconstructed fly ash had the characteristics of a solid acid, which led to a decrease in the pH of the soil and an inverse increase in the fraction of exchangeable Cd by about 23%. The use of fly ash for pollution remediation after a low-cost treatment holds promise for its mass consumption and resourcing. |
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