Sorption and ecotoxicity of pentachlorophenol polluted sediment amended with rice-straw derived biochar |
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Authors: | Lou Liping Wu Binbin Wang Lina Luo Ling Xu Xinhua Hou Jiaai Xun Bei Hu Baolan Chen Yingxu |
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Affiliation: | a Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, People’s Republic of China b Center of Analysis and Measurement of Zhejiang Sci-Tech University, Hangzhou 310028, People’s Republic of China |
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Abstract: | To investigate the feasibility of using biochar to control organic pollutants in sediments, we extracted biochar from rice-straw combustion residues (RBC) and studied its adsorption ability and effect on seed germination ecotoxicity of pentachlorophenol (PCP). The results showed that the Freundlich and dual-mode models could describe all the sorption isotherm data well, and the log KOC values increased with increasing RBC content. With 50 mg kg−1 PCP in the sediment, a significant seed growth inhibition (P < 0.01) was observed. The addition of 2.0% RBC lowered the PCP concentration in the extraction liquid from 4.53 to 0.17 mg L−1 and increased the germination rate and root length significantly. Furthermore, it was found that the addition of RBC had no toxic but stimulative effect on root elongation. Consequently, RBC could serve as a potential supersorbent for the remediation of organic pollution in situ. |
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Keywords: | Biochar Pentachlorophenol (PCP) Sorption Ecotoxicity Sediment |
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