褐铁矿填料反硝化生物滤池的运行及其微生物群落结构分析

发布时间：2018-06-24 12:07

本文选题：褐铁矿 + 反硝化生物滤池　；参考：《合肥工业大学》2016年硕士论文

【摘要】：目前我国城市生活污水处理系统的二沉池出水中仍含有少量的的氮和磷,如果将其直接排入水体则会产生污染,可能导致水体的富营养化。因此,近年来二沉池出水的深度处理受到广泛关注。反硝化生物滤池(Denitrification Biofilter, DNBF)作为一种三级生物脱氮工艺具有占地面积小、能耗低、运行维护方便、处理效果稳定等优点。本研究主要以石英砂和褐铁矿为填料,分别对两个反硝化生物滤池的启动时间、运行条件和二沉池出水的深度处理效果进行了考察,并且对两个反硝化生物滤池内的微生物群落结构分析。结果表明：(1)在启动挂膜阶段褐铁矿为填料的DNBF从启动到稳定运行时间为8 d,比石英砂为填料的DNBF提前了7 d,说明褐铁矿为填料能够缩短DNBF的启动时间；(2)在反应器稳定运行期间：褐铁矿为填料的DNBF中N03--N的去除率保持在98%以上,比石英砂为填料的DNBF中N03--N的去除率高出十五个百分点,并且出水中亚硝态氮的积累量也大大低于石英砂组；褐铁矿为填料的反硝化生物滤池在不同碳氮比(C/N)条件下对N03--N的去除率均高于90%,显著优于石英砂组；在相同反冲洗条件下,褐铁矿为填料的反硝化生物滤池能在更短的时间内恢复滤池的处理能力并达到稳定状态。(3)两个反硝化生物滤池中均具有变形菌门、拟杆菌门、绿菌门以及螺旋体门这四种类型的微生物。其中变形菌门微生物大都具有反硝化能力。且褐铁矿为填料的反硝化生物滤池中微生物丰度较高,代表微生物群落结构较稳定,并且含有更多具有降解芳香族化合物等难降解有机物的细菌。
[Abstract]:At present, there are still a small amount of nitrogen and phosphorus in the effluent of secondary settling tank of domestic sewage treatment system in our country. If discharged directly into the water body, it will produce pollution, which may lead to eutrophication of water body. Therefore, in recent years, the advanced treatment of secondary sedimentation tank effluent has received extensive attention. Denitrification biofilter (DNBF) has the advantages of small area, low energy consumption, convenient operation and maintenance, and stable treatment effect as a three-stage biological denitrification process. In this study, quartz sand and limonite were used as fillers to investigate the start-up time, operation conditions and advanced treatment effect of the effluent from the secondary sedimentation tank, respectively, for the two denitrifying biofilters. The microbial community structure in two denitrification biofilters was analyzed. The results are as follows: (1) DNBF with limonite as filler in start-up and hanging film stage is 8 days from start-up to stable operation, which is 7 days ahead of DNBF with quartz sand as filler, indicating that limonite as filler can shorten the start-up time of DNBF; (2) during the stable operation of the reactor, the removal rate of N03 N in DNBF filled with limonite is over 98%, which is 15 percentage points higher than that in DNBF filled with quartz sand. The denitrifying biofilter with limonite as filler has a higher removal rate of N03-N than that of quartz sand under different C / N ratio (C / N), which is significantly better than that of quartz sand group, and the denitrifying biofilter with limonite as filler is better than that of quartz sand group under the same condition of backwashing. The denitrifying biofilter with limonite as filler can recover the treatment capacity of the filter in a shorter time and reach a stable state. (3) both denitrifying biofilters have Proteus phylum, Bacteroides phylum. There are four types of microbes, the phylum green and the spirochetes. Most of them have denitrification ability. In the denitrifying biofilter filled with limonite, the microbial abundance was higher, which indicated that the microbial community structure was stable, and there were more bacteria that could not degrade organic compounds such as aromatic compounds.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X703

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