本文選題：溴酸鹽 + 硝酸鹽�。� 參考：《中國環(huán)境科學》2017年05期

【摘要】：溴酸鹽(BrO_3~-)是由于含溴離子(Br~-)的水體經(jīng)過臭氧或加氯消毒后產(chǎn)生的消毒副產(chǎn)物,在毒理致癌性分級上被國際癌癥研究機構(gòu)定為II類致癌物.實驗設計了一種旋轉(zhuǎn)電極生物膜反應器系統(tǒng)(RBER),可將濃度范圍為150~800μg/L的溴酸鹽降解,且溴酸鹽被完全還原為溴離子,沒有其他中間產(chǎn)物生成.在反應器運行過程中發(fā)現(xiàn),硝酸鹽與溴酸鹽對氫電子供體存在明顯的競爭關(guān)系,且硝酸鹽對氫電子供體競爭能力強于溴酸鹽.選取反應器運行不同階段的生物膜樣品進行DNA提取和高通量測序分析微生物群落多樣性.結(jié)果表明,優(yōu)勢菌屬主要有Bacillus(枯草桿菌屬)、Pseudomonas(假單胞菌屬)和Lactococcus(乳球菌屬)3類,其在總菌屬中相對豐度占比分別為37.0%、16.2%和11.1%,可能是實現(xiàn)溴酸鹽生物降解的主要優(yōu)勢菌群.
[Abstract]:Bromate (BrO3-) is a by-product of disinfection caused by ozone or chlorination in bromo-containing water. It is classified as a class II carcinogen by the International Agency for Cancer Research (IARC) in toxicological carcinogenicity classification. A rotating electrode biofilm reactor system (RBER) was designed to degrade bromate in the concentration range of 150 渭 g / L to 800 渭 g / L, and the bromate was completely reduced to bromine ion without any other intermediate products. During the operation of the reactor, it was found that nitrate and bromate had obvious competitive relationship with hydrogen electron donor, and the competition ability of nitrate to hydrogen electron donor was stronger than that of bromate. Biofilm samples at different stages of operation were selected for DNA extraction and high throughput sequencing to analyze the diversity of microbial communities. The results showed that the dominant genera were Bacillus Pseudomonas (Pseudomonas) and Lactococcus (Lactococcus). The relative abundance of Bacillus and Lactococcus were 37.0% and 11.1%, respectively, which might be the dominant bacteria for the biodegradation of bromate.
【作者單位】： 湖南省環(huán)境保護科學研究院;水污染控制技術(shù)湖南省重點實驗室;湖南大學環(huán)境科學與工程學院;
【基金】：國家自然科學基金資助項目(51378188,51478170) 國家國際科技合作專項項目(2013DFG91190)
【分類號】：X172
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本文編號：2107355