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首页> 外文期刊>Environmental Science & Technology >Biotransformation of α-, β-, γ-, and δ-Hexachlorocyclohexane under Methanogenic Conditions
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Biotransformation of α-, β-, γ-, and δ-Hexachlorocyclohexane under Methanogenic Conditions

机译：产甲烷条件下α-，β-，γ-和δ-六氯环己烷的生物转化

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摘要

During the production of the pesticide lindane (γ-hexachlorocyclohexane; γ-HCH), large quantities of byproducts, like the α-, β-, and δ-HCH isomers, were discarded at dump sites. β-HCH was found to be extremely persistent in the environment under aerobic conditions. We studied the degradation of this isomer under methanogenic conditions in a flow-through column packed with polluted sediment. β-HCH was completely removed in this system. Chloroben-zene was detected in the effluent as a product. A β-HCH transforming anaerobic enrichment culture was obtained in batch cultures by using the column material as inoculum. δ-2, 3, 4, 5-Tetrachlorocyclohexene is proposed as an intermediate during transformation, while benzene and chlorobenzene were formed as stable end products. The enrichment culture was also able to dechlorinate α-HCH at a comparable rate and γ- and δ-HCH at lower rates. Dechlorination was inhibited by the addition of vancomycin, but not by the addition of bromoethanesulfonic acid. Pasteurization inhibited dechlorination completely. This is the first detailed description of the biodegradation of β-HCH, including intermediate and end product identification, under defined anaerobic conditions.
机译：在农药林丹（γ-六氯环己烷；γ-HCH）的生产过程中，大量副产物（如α-，β-和δ-HCH异构体）被丢弃在倾倒场。发现在有氧条件下，β-六氯环己烷在环境中极为持久。我们在充满污染沉积物的流通塔中，在产甲烷条件下研究了该异构体的降解。该系统中已完全去除了乙型六氯环己烷。在废水中检测出氯丁烯作为产物。通过使用柱材料作为接种物，在分批培养中获得了β-HCH转化的厌氧富集培养。有人提出将δ-2、3、4、5-四氯环己烯作为转化过程中的中间体，而将苯和氯苯作为稳定的终产物形成。富集培养还能够以相当的速率对α-HCH进行脱氯，而以更低的速率对γ-和δ-HCH脱氯。加入万古霉素可抑制脱氯，但加入溴乙烷磺酸则不能。巴氏杀菌完全抑制了脱氯。这是在限定的厌氧条件下对乙型六氯环己烷的生物降解的首次详细描述，包括中间产物和最终产物的鉴定。

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