期刊
ENVIRONMENTAL POLLUTION
卷 158, 期 5, 页码 1733-1740出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2009.11.020
关键词
Reductive dechlorination; DDT; Dissimilatory iron-reducing bacteria; Iron oxide
资金
- National Natural Science Foundations of China [40601043, 40771105]
- National Agricultural Science and Technology Foundations [200803029]
The transformation of DDT was studied in an anaerobic system of dissimilatory iron-reducing bacteria (Shewanella decolorationis S12) and iron oxide (alpha-FeOOH). The results showed that S. decolorationis could reduce DDT into DDD, and DDT transformation rate was accelerated by the presence of alpha-FeOOH. DDD was observed as the primary transformation product, which was demonstrated to be transformed in the abiotic system of Fe2+ + alpha-FeOOH and the system of DIRB + alpha-FeOOH. The intermediates of DDMS and DBP were detected after 9 months, likely suggesting that reductive dechlorination was the main dechlorination pathway of DDT in the iron-reducing system. The enhanced reductive dechlorination of DDT was mainly due to biogenic Fe(II) sorbed on the surface of alpha-FeOOH, which can serve as a mediator for the transformation of DDT. This study demonstrated the important role of DIRB and iron oxide on DDT and DDD transformation under anaerobic iron-reducing environments. (C) 2009 Elsevier Ltd. All rights reserved.
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