中文摘要：

以实际生活污水培养驯化污泥的小试规模A／A／O工艺为研究对象，进行了污泥龄（SRT）为8、10、12和15d时对反硝化除磷的影响研究．结果表明，随着污泥龄的延长，反硝化除磷对系统除磷所起的作用越大，反硝化聚磷菌缺氧利用单位PHA。的反硝化数量和吸磷量也迅速增加，聚磷菌好氧利用单位PHAs的吸磷量并没有受到影响，以SRT为12d时反硝化除磷和系统脱氮除磷效果为最好．结果还表明，去除单位氮所需COD数量随污泥龄的延长呈减少趋势，而去除单位磷所需COD数量呈增大趋势．对于我国典型的城市污水而言，SRT为12d和15d时去除单位氮和磷所需的外碳源数量较8d时要低，从而使反硝化除磷作用可真正地达到节省碳源和能源的目的．

英文摘要：

Based on a laboratory-scale anaerobic-anoxic-oxic process acclimated with municipal wastewater, effect of SRT on denitrifying phosphorus removal occurred in the system was investigated. The results indicate that the contribution of anoxic denitrifying phosphorus removal to total phosphorus removal becomes larger with prolonging the sludge retention time. DNPAOs＇ denitrification and P uptake capacities per anoxic PHAs utilized are quickly increased, while PAOs＇ P uptake capacity per aerobic PHAs utilized is rarely influenced by SRT. When SRT is set at 12 days, anoxic phosphorus uptake effciency and biological nutrient removal efficiency are best. The results also show that the COD amountrequired for removing per nitrogen decreases and for removing per phosphorus increases with prolonging the sludge retention time. For the national typical municipal wastewater, the COD amount required for removing per nitrogen and phosphorus under SRT of 12 and 15 days is less than that of under SRT of 8 days, which indicates that anoxic denitrifying phosphorus removal can really decrease the demand of carbon and energy sources.