Dechlorination of p,p′-DDTs coupled with sulfate reduction by novel sulfate-reducing bacterium Clostridium sp. BXM
2012
Bao, Peng | Hu, Zheng-Yi | Wang, Xin-Jun | Chen, Jian | Ba, Yu-Xin | Hua, Jing | Zhu, Chun-You | Zhong, Min | Wu, Chun-Yan
A novel non-dsrAB (without dissimilatory sulfite reductase genes) sulfate-reducing bacterium (SRB) Clostridium sp. BXM was isolated from a paddy soil. Incubation experiments were then performed to investigate the formation of reduced sulfur compounds (RSC) by Clostridium sp. BXM, and RSC-induced dechlorination of p,p′-DDT in culture medium and soil solution. The RSCs produced were 5.8mM and 4.5mM in 28mM sulfate amended medium and soil solution respectively after 28-day cultivation. The p,p′-DDT dechlorination ratios were 74% and 45.8% for 5.8mM and 4.5mM RSCs respectively at 6h. The metabolites of p,p′-DDT found in the two reaction systems were identified as p,p′-DDD and p,p′-DDE. The dechlorination pathways of p,p′-DDT to p,p′-DDD and p,p′-DDE were proposed, based on mass balance and dechlorination time-courses. The results indicated that RSC-induced natural dechlorination may play an important role in the fate of organochlorines.
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