摘要
研究了中试规模的上向流曝气生物滤池(Up-Flow Biological Aerated Filter,UBAF)处理生活污水时,异养菌与自养型硝化菌在反应器中的空间分布。试验阶段,进水CODCr/NH4+-N维持在6左右。水力负荷低于3m3/m2.h时,滤池中出现了两个不同的功能分区。进水端表现在有机物的快速去除,因此聚居的主要为异养菌;出水端表现为NH4+-N的迅速氧化,因此聚居的主要为硝化菌。沿滤层高度上溶解氧低谷是两个区域清晰的分界线。在进水水质稳定的情况下,影响两种微生物群落空间分布的重要因素是水力负荷,随其增加,分界线将逐渐上移,即发生了微生物群落的演替现象。当水力负荷超过3m3/m2.h时,分界线消失,硝化菌最终被竞争出反应器,此时NH4+-N的去除源于异养菌的同化作用。
Spatial distribution of heterotrophs and nitrifiers in an up - flow biological aerated filter （UBAF） of pilot scale used to process the hife sewage has been studied. During the experiment, the reactor was fed with settled domestic sewage, remaining a CODCr/NH4^ ＋ - N ratio of 6. When hydrauhc loading was below 3m^3/m^2·h, It appeared two different performance zones within the filter. In the lower of the filter, a majority of heterotrophic microorgalusms colonized and CODc, was removed rapidly; In the upper of the filter, nitifiers colonized and NH4^＋- N was oxidized. A valley of dissolved oxygen concentration in the filter was the frontier between the two zones. An important factor affecting the spatial distribution of different microbial groups in UBAF is hydraulic loading, as which increased, the frontier progressed along the length of the filter. This case produced a succession of dominant community in space of reactor. For hydraulic loading higher than 3m^3/m^2· h,the frontier disappeared and nitrifiers were outcompeted.
出处
《应用能源技术》
2006年第2期11-15,共5页
Applied Energy Technology
关键词
上向流曝气生物滤池
异养菌
硝化菌
空间分布
水力负荷
演替
Up- Flow Biological Aerated FiLter
Heterotrophs
Nitifiers
Spatial Distribution
irydrauhic loading succession
