Efficient remediation of river sediments contaminated by polychlorinated biphenyls and hexachlorobenzene by coupling in situ phase-inversion emulsification and biological reductive dechlorination

doi:10.1016/j.ibiod.2019.02.007

CNU IR > College of Sustainable Environment and Recreation > Dept. of Environmental Engineering and Science (including master's program) > Periodical Articles > Item 310902800/32644

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題名:	Efficient remediation of river sediments contaminated by polychlorinated biphenyls and hexachlorobenzene by coupling in situ phase-inversion emulsification and biological reductive dechlorination
作者:	Chang, Shu-Chi Yeh, Chia-Wei Lee, Szu-Kuang Chen, Tzu-Wen Li-Chu Tsai(蔡利局)
貢獻者:	Natl Chung Hsing Univ, Dept Environm Engn Chia Nan Univ Pharm & Sci, Dept Environm Engn & Sci
關鍵詞:	Sediment remediation Polychlorinated biphenyls Hexachlorobenzene In situ phase inversion emulsification Reductive dechlorination
日期:	2019-05
上傳時間:	2020-07-29 13:53:29 (UTC+8)
出版者:	ELSEVIER SCI LTD
摘要:	Sediment contamination in Taiwan is a critical environmental problem because it threatens human health through food chains and the local ecosystem as well. Er-Ren River (ERR) in southern Taiwan is one of the most polluted and its sediments have been severely contaminated by hydrophobic organic compounds (HOCs). Among all HOCs, polychlorinated biphenyls (PCBs) have been detected at high levels while hexachlorobenzene (HCB) has been most frequently detected. Due to their higher K-ow values and lower biodegradability, they can be biomagnified through trophic levels and consequently pose high risks to humans and the ecosystem. This field study is to demonstrate an effective remediation technology on sediments contaminated by Aroclor 1254 and HCB by coupling in situ phase-inversion emulsification and biological reductive dechlorination (ISPIE/BiRD). By using real contaminated sediment with weathered and freshly-added contaminants, a single ISPIE operation can remove about 62% and 60% of weathered Aroclor 1254 and HCB, respectively. For weathered HCB and Aroclor 1254, the total removal could reach as high as 98% in 70 days. Metagenomic results showed that heat selection during ISPIE significantly changed the diversity and species evenness of the microbial community and that the Dehalococcoides were not positively correlated with the PCB removals. Instead, heat-tolerant archaea, Methanosaeta spp., may play much more important roles in the subsequent biological dechlorination. These results strongly support that ISPIE/BiRD is highly feasible on a full-scale field remediation and that this new microbial consortium could be a highly effective tool for bioremediation of HOC-contaminated sediments.
關聯:	International Biodeterioration & Biodegradation, v.140, pp.133-143
顯示於類別:	[Dept. of Environmental Engineering and Science (including master's program)] Periodical Articles

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