煤气废水有机污染物缺氧生物降解性能及机理  

Treatment of typical organic pollutants by acclimated activated sludge under anoxic conditions

作　　者：韩洪军[1] 徐鹏[1] 贾胜勇[1] 庄海峰[1] 侯保林[1] 王德欣[1] 李琨[1] 赵茜[1] 马文成[1] 

机构地区：[1]哈尔滨工业大学市政环境工程学院,哈尔滨150090

出　　处：《哈尔滨工业大学学报》2015年第8期30-37,共8页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金青年基金(51308149);国家水专项经费资助项目(2008ZX07207);哈尔滨工业大学自主课题(2013DX10)

摘　　要：为考察煤制气废水3种典型有机污染物(喹啉、吡啶、邻苯二酚)的缺氧生物降解性能及降解途径,利用缺氧驯化污泥作为接种污泥,以硝态氮为电子受体,考察了3种有机物的缺氧降解过程,并利用UV-Vis和GC/MS分析3种物质缺氧降解机理.结果表明:3种污染物对缺氧微生物抑制与毒害作用随初始质量浓度增加而增强;缺氧降解48 h后,剩余底物质量浓度随初始质量浓度增加而增大;3种污染物缺氧生物降解速率常数大小顺序为吡啶>邻苯二酚>喹啉.缺氧降解中污染物未被完全氧化成CO2和H2O,部分生成了较底物自身降解性更差的中间产物.葡萄糖共基质可以提高难降解污染物缺氧降解性能,且共代谢作用对自身生物降解性差的污染物降解性能的提高更显著.利用UV-Vis和GC/MS分析了污染物缺氧生物降解途径,结果表明,喹啉和吡啶的降解均始于分子羟基化反应.污染物定量结构-生物降解性关系(QSBR)研究表明,3种物质的缺氧降解速率常数Ks与分子连接性指数1Xv和前线最高占据轨道能EHOMO有很好的相关性.In order to investigate the anoxie biodegradability and degradation pathway of three typical organic pollutants （quinoline, pyridine and eatechol） in coal gasification wastewater, the acclimated anoxie activated sludge used as seeded sludge with NO3-N as eleetron acceptor, and the anoxie degradation intermediates of the three pollutants were determined by UV-Vis and GC,/MS analysis. Results showed that the inhibitory and toxic effects of the three compounds strengthened with the increase of the initial concentration. The residual concentration with the of its initial concentration 48 h anoxie treatment. The anoxic degradation rate constants of the three pollutants in descending order were pyridine, catechol and quinoline. The pollutants were partly converted into intermediates which were more refractory than the original compounds, instead of being mineralized to CO2 and H20. The anoxic biodegradability of these pollutants enhanced with the addition of glucose as co-substrate. The co-metabolism effects were more significant when the pollutants were more refractory. The degradation of quinoline and pyridine initiated with the hydroxylation reaction. The possible degradation pathways were proposed based on the intermediates analysis. QSBR studies of the above three compounds showed that biedegradation rate constant （Ks ） was significantly eorrelated with molecular connectivity indices 1X as well as highest occupied molecular orbital EHOMO.

关 键 词：缺氧降解 定量结构-生物降解性关系 共代谢 生物降解性能 降解途径 

分 类 号：X703[环境科学与工程—环境工程]