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| Removal of bromate by a rotating biofilm-electrode reactor (RBER) and microbial community analyses |
| ZHONG Yu1,2, YANG Qi3, LI Xiao-ming3, LIU Zhan1,2, XIANG Ren-jun1,2, WEN Tao1,2, CHENG Ying-xiang1,2, YOU Xiang-yu1, LUO Da-tong1 |
1. Hunan Research Academy of Environment Science, Changsha 410004, China;
2. Hunan Key Laboratory of Water Pollution Control Technology, Changsha 410004, China;
3. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China |
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Abstract Bromate is an oxyhalid disinfection byproduct (DBP) during chlorination or ozonation of bromide-containing water, which has been classified as a group II carcinogen (as a possible human carcinogen) by the International Agency for Research on Cancer (IARC). In this study, an auto-hydrogenotrophic rotating biofilm-electrode reactor (RBER) was designed for bromate removal, and the running tests confirmed that the RBER system could completely reduce 150~800 μg/L bromate to bromide without accumulation of by-products. The competition for the electron donor H2 appeared between bromate and nitrate during the RBER operation, and H2-utilization of NO3- was prior to BrO3- when H2 was limiting. The high-throughput sequencing was employed to investigate the microbial communities of six biofilm samples from different stage of RBER. According to 16S rRNA gene sequencing, the dominant genus-level bacteria were Bacillus (37.0%), Pseudomonas (16.2%) and Lactococcus (11.1%). These three species are dominant genus-level bacteria, which may be the main bromate-reducing bacteria in RBER.
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Received: 14 September 2016
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