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首页> 外文期刊>International Biodeterioration & Biodegradation >Efficient remediation of river sediments contaminated by polychlorinated biphenyls and hexachlorobenzene by coupling in situ phase-inversion emulsification and biological reductive dechlorination
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Efficient remediation of river sediments contaminated by polychlorinated biphenyls and hexachlorobenzene by coupling in situ phase-inversion emulsification and biological reductive dechlorination

机译：通过偶极相 - 转化乳化和生物学中还原脱氯，有效地修复由多氯联苯基和六氯苯污染的河沉积物和六氯苯

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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.
机译：台湾的沉积物污染是一个关键的环境问题，因为它也威胁着食物链和当地生态系统的人类健康。台湾南部的ER-REN RIVER（ERR）是最受污染的，其沉积物受到疏水性有机化合物（HOC）的严重污染。在所有HOC中，在高水平下检测到多氯联苯（PCB），而最常检测到六氯苯（HCB）。由于其较高的K-OV值和降低的生物降解性，它们可以通过营养水平进行生物镀锌，因此对人类和生态系统带来了高风险。该实地研究是通过原位相位转化乳化和生物还原脱氯（ISPIE /鸟）通过偶联（ispie /鸟），展示由芳烃1254和HCB污染的沉积物的有效修复技术。通过使用具有风化和新鲜污染物的真正受污染的沉积物，单一的ispie操作可以分别去除约62％和60％的风化芳烃1254和HCB。对于风化的HCB和Aroclor 1254，总去除率在70天内可高达98％。 Metagenomic结果表明，ISPIE期间的热量选择显着改变了微生物群落的多样性和物种均匀性，并且除去脱卤与PCB去除呈正相关。相反，耐热古代，甲蛋白酶，可以在随后的生物脱氯中发挥更重要的作用。这些结果强烈支持ispie /鸟对全规模的田间修复非常可行，并且这种新的微生物联盟可能是Hoc污染沉积物生物修复的高效工具。

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