Biodegradation of 2,2',4,4'-tetrabromodiphenyl ether in an aerobic environment by a novel strain of Bacillus sp.

摘要

The environmental safety of 2,2',4,4'-tetrabromodiphenyl ether (BDE-47), a widely used flame retardant, has been the topic of controversial discussions during the past decade years. In this study, we investigated the BDE-47 degradation by a novel bacteria obtained from electronic waste recycling site soil sample in Taizhou, China. Using biochemical characteristics and 16S rDNA gene sequencing, the strain was closely related to Bacillus sp. with a 99% 16S rDNA gene sequence similarity. It could use BDE-47 as the sole carbon source and energy source for its growth. The optimal growth environment was in the presence of BDE-47 at concentrations to 50-200 ug/L, pH 6.0 to 8.0 and 37°C when agitated at 160 rpm. For the initial concentrations of 100 ug/L, 50% of the BDE-47 was degraded. This is the first report of BDE47-degrading strain from the genus of Bacillus sp. under aerobic condition.