摘要
用释磷/聚磷装置和微生物筛选、分离方法研究A2/O工艺缺氧池污泥,确定缺氧池中反硝化聚磷菌(DPB)的比例,筛选、分离得反硝化聚磷单菌株且对单菌株聚磷特性进行研究。结果表明,缺氧池中DPB占聚磷菌(PAO)的比例约为21.5%。从缺氧池分离得到的肠杆菌科、气单胞菌属和假单胞菌属都是DPB,而不动杆菌属仅是好氧PAO,葡萄球菌属和微球菌属仅是一种专职的反硝化菌。反应过程中同时存在O2和NO3-时,肠杆菌科优先利用水中的O2进行聚磷;在缺氧环境中,肠杆菌科在COD为30mg/L时的聚磷效果优于COD为180mg/L时的聚磷效果。可见DPB的反硝化和聚磷的特性与电子受体的存在形式和COD有密切关系。因此,改良传统A2/O工艺和研发同步反硝化聚磷装置时,必须控制缺氧反硝化聚磷单元中混合液的DO和COD。
Many denitrifying phosphate accumulating bacteria （DPB） were found in the anoxic bioreactor mixed liquor of an A^2/O wastewater treatment system in southern China. The DPBs accounted for about 21.5% of total phosphate accumulating organisms （PAO） present. Enterobacterfaceae sp. , Aeromonas sp. and Pseudomonas sp. were DPBs; Acinetobacter sp. was a PAO; Staphylococcus sp. and Micrococcus sp. were strictly denitrifying bacteria. The nature of electronic acceptor and/or the amount of organic matters present in the reactor affected the denitrification and phosphorus accumulation characteristics of DPB; Enterobacteriaceae sp. consumed oxygen first when oxygen and nitrate were both present, and under anoxic conditions, accumulated more phosphorus at a lower COD （30 vs. 180 mg/L）. Proper control of dissolved oxygen and COD of the anoxic mixed liquor was necessary for improving performance of a conventional A^2/O treatment system.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2007年第6期437-442,共6页
Environmental Pollution & Control
关键词
A^2/O
缺氧池
反硝化聚磷
反硝化聚磷菌
A^2/O Anoxic tank Denitrifying phosphorus accumulation Denitrifying phosphorus bacteria
