Abstract
The aerobic biodegradation of lindane (γ-hexachlorocyclohexane) by a consortium of acclimated bacteria from sediment at a polluted site on the Suquia River, Cordoba, Argentina, is reported. The bacteria were acclimated for 30 days under aerobic conditions, using a minimal culture medium containing lindane (0.034mM) as sole carbon source. Growth of the bacterial consortium decreased at a lindane concentration of 1.03mM and was totally inhibited at 2.41mM. The consortium showed initial lindane degradation rates of 4.92×10−3, 11.0×10−3 and 34.8×10−3mMh−1 when exposed to lindane concentrations of 0.069, 0.137 and 0.412mM, respectively. Chloride concentration increased during aerobic biodegradation, indicating lindane mineralization. A metabolite identified as γ-2,3,4,5,6-pentachlorocyclohexene appeared during the first 24h of biodegradation. Four different bacteria, identified as Sphingobacterium spiritivorum, Ochrobactrum anthropi, Bosea thiooxidans and Sphingomonas paucimobilis, were isolated. Pure strains of B. thiooxidans and S. paucimobilis degraded lindane after 3 days of aerobic incubation. This is the first report of lindane biodegradation by B. thiooxidans.
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