【摘要】 溴酸盐（BrO₃^-）是由于含溴离子（Br^-）的水体经过臭氧或加氯消毒后产生的消毒副产物,在毒理致癌性分级上被国际癌症研究机构定为II类致癌物.实验设计了一种旋转电极生物膜反应器系统（RBER）,可将浓度范围为150⁸00μg/L的溴酸盐降解,且溴酸盐被完全还原为溴离子,没有其他中间产物生成.在反应器运行过程中发现,硝酸盐与溴酸盐对氢电子供体存在明显的竞争关系,且硝酸盐对氢电子供体竞争能力强于溴酸盐.选取反应器运行不同阶段的生物膜样品进行DNA提取和高通量测序分析微生物群落多样性.结果表明,优势菌属主要有Bacillus（枯草杆菌属）、Pseudomonas（假单胞菌属）和Lactococcus（乳球菌属）3类,其在总菌属中相对丰度占比分别为37.0%、16.2%和11.1%,可能是实现溴酸盐生物降解的主要优势菌群.更多还原

【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 150⁸00 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 H_2-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 16 SrRNA 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.更多还原