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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。
Ammonia nitrogen pollution of water sources is widespread, and ammonia nitrogen pollution in winter low temperature is more difficult in drinking water production. Based on the prefabricated BAF / BAF system and the Songhua River water as the research object, the characteristics of the BAF treated with ammonia nitrogen at low temperature and the response to temperature change were studied. Study. During the long-term low temperature operation of 1.0-5.5 ℃, the average removal rate of ammonia nitrogen by BAF was 77.08%. With the prolongation of low temperature operation and the decrease of temperature, the nitrification increased. Using high-throughput sequencing technology to analyze the biofilm community structure on the surface of the packing material, it was found that the diversity of the biofilm flora at low temperature was lower than that at the normal temperature, but the dominant bacteria were significantly different after long-term domestication at low temperature. The number of the genus Nitrosomonas and the genus Nitrosomonas in the low temperature period was higher than that in the normal temperature, indicating that the nitrifying bacteria can proliferate and domestication at low temperature.