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化工学报  2015 

中试规模AAO-曝气生物滤池双污泥系统的启动运行

DOI: 10.11949/j.issn.0438-1157.20150188, PP. 4228-4235

Keywords: 双污泥系统,生物膜,反硝化除磷,低C/N,污水,降解

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Abstract:

AAO-曝气生物滤池(BAF)是污泥龄差距较大的双污泥系统,可在低C/N条件下实现氮、磷的同步去除。本试验以低碳氮比的城市污水为处理对象,研究了处理量为40~100m3·d-1的大型中试级别的AAO-BAF脱氮除磷工艺的启动运行。通过先使AAO和BAF独立运行以分别培养驯化聚磷菌活性污泥和硝化细菌生物膜,待分别观察到AAO出水TP及BAF出水NH4+-N浓度稳定后,再将两部分连通运行的策略,使得在第58天时系统出水COD、、TN、TP、浊度、SS分别小于50mg·L-1、5mg·L-1、15mg·L-1、0.5mg·L-1、5NTU、10mg·L-1,表明该中试系统已成功启动。与小试研究比较发现,分开运行更有利于聚磷菌的培养驯化;BAF中采用自然挂膜法较接种污泥法更方便,但增加了填料挂膜的时间。根据微生物群落多样性分析,发现AAO中的硝化细菌丰度少于3%,而BAF生物膜上的硝化细菌的丰度占到12%以上。本试验可为该工艺的实际工程应用提供一定参考。

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