【摘要】 水源水氨氮污染问题广泛存在,而冬季低温期氨氮污染更是饮用水生产中的难题。以前期构建的悬浮填料/沸石曝气生物滤池(BAF)系统为基础,以松花江水为研究对象,对曝气生物滤池在低温期处理氨氮的效能和响应温度变化的菌群特性进行了研究。在1.0~5.5℃的长期低温运行过程中,BAF对氨氮的平均去除率为77.08%,随着低温运行时间的延长和温度下降,硝化作用增强。利用高通量测序技术解析填料表面生物膜群落结构,发现低温期的生物膜菌群多样性虽较常温期低,但经低温长期驯化后,优势菌群差异明显,常温下的优势菌属在低温期均下降,低温期的硝化螺旋菌属和亚硝化单胞菌属的数量却高于常温期,表明硝化细菌在低温环境下是可以增殖、驯化的。更多还原

【Abstract】 Ammonia pollution in source water is an extensive problem,which brings many difficulties to drinking water production at low temperature in winter. The performance of biological aerated filter with suspended media/zeolite as well as the changes of bacterial community responding to the temperature fluctuation were investigated using source water from Songhua River as the research object. The results showed that the average removal rate of ammonia nitrogen was 77. 08% at 1. 0 ℃ to 5. 5 ℃. Nitrification effect would be enhanced with the increase of low-temperature operation time and decrease of temperature. The high-throughput sequencing technology was used to analyze the biofilm community structure on media surface. It was found that the diversity of biofilm bacteria at low temperature was less than that at normal temperature,but after long-term cold acclimation,dominant bacteria showed significant differences. The dominant species at normal temperature decreased at low temperature,and quantities of Nitrospira and Nitrosomonas at low temperature were higher than that at normal temperature,indicating that nitrifying bacteria could proliferate and be domesticated under low temperature environment.更多还原