Abstract
This study investigated the aerobic degradation of tetrabromobisphenol-A (TBBPA) and changes in the microbial community in river sediment from southern Taiwan. Aerobic degradation rate constants (k1) and half-lives (t1/2) for TBBPA (50μgg−1) ranged from 0.053 to 0.077d−1 and 9.0 to 13.1d, respectively. The degradation of TBBPA (50μgg−1) was enhanced by adding yeast extract (5mgL−1), sodium chloride (10ppt), cellulose (0.96mgL−1), humic acid (0.5gL−1), brij 30 (55μM), brij 35 (91μM), rhamnolipid (130mgL−1), or surfactin (43mgL−1), with rhamnolipid yielding a higher TBBPA degradation than the other additives. For different toxic chemicals in the sediment, the results showed the high-to-low order of degradation rates were bisphenol-A (BPA) (50μgg−1)>nonylphenol (NP) (50μgg−1)>4,4′-dibrominated diphenyl ether (BDE-15) (50μgg−1)>TBBPA (50μgg−1)>2,2′,3,3′,4,4′,5,5′,6,6′-decabromodiphenyl ether (BDE-209) (50μgg−1). The addition of various treatments changed the microbial community in river sediments. The results also showed that Bacillus pumilus and Rhodococcus ruber were the dominant bacteria in the process of TBBPA degradation in the river sediments.
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