Publication Cover
Journal of Environmental Science and Health, Part B
Pesticides, Food Contaminants, and Agricultural Wastes
Volume 46, 2011 - Issue 3
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ARTICLES

Isolation and characterization of an Alcaligenes sp. strain DG-5 capable of degrading DDTs under aerobic conditions

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Pages 257-263 | Received 12 Jul 2010, Published online: 01 Apr 2011
 

Abstract

In this study, an Alcaligenes sp. strain DG-5 that can effectively degrade dichlorodiphenyltrichloro-ethanes (DDTs) under aerobic conditions was isolated from DDTs-contaminated sediment. Various factors that affect the biodegradation of DDTs by DG-5 were investigated. About 88 %, 65 % and 45 % of the total DDTs were consumed within 120 h when their initial concentrations were 0.5, 5 and 15 mg L−1, respectively. However, almost no degradation was observed when their concentration was increased to 30 mg L−1, but the addition of nutrients significantly improved the degradation, and 66 % and 90 % of the total DDTs were degraded at 336 h in the presence of 5 g L−1 peptone and yeast extract, respectively. Moreover, the addition of 20 mM formate also enhanced the ability of DG-5 to transform DDTs, and its DDT transformation capacity (Tc) value was increased by 1.8 - 2.7 fold for the pure (p,p’-DDT or o,p’-DDT only) and mixed systems (p,p’-DDT, o,p’-DDT, p,p’-DDD and p,p’-DDE). Furthermore, it was found that competitive inhibition in the biodegradation by DDT compounds occurred in the mixed system.

Acknowledgments

This work was supported by National High Technology Research and Development Program (2004AA649070) from the Ministry of Science and Technology of P. R. China.

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