生物除磷脱氮系统工程设计中的污泥龄

Sludge Retention Time in Design of Biological Phosphorus and Nitrogen Removal System

在分析了污泥龄概念的基础上,指出生物除磷脱氮系统总污泥龄与好氧污泥龄的区别,并且该系统厌氧、缺氧与好氧各个反应阶段的污泥龄比系统总污泥龄更重要.在进行生物除磷脱氮系统的工程设计时,厌氧污泥龄和缺氧污泥龄一般为1～1.5 d和1～4 d,好氧污泥龄不宜盲目取大,可用满足硝化功能的最小污泥龄乘以适宜的安全系数求得,而系统总污泥龄以15 d左右为宜.

Based on the concept of sludge retention time （SRT）, the difference between general SRT and aerobic SRT is pointed out in this paper and it shows that the SRT of each reaction phase, such as anaerobic, anoxic and aerobic one, are more important than general SRT in biological phosphorus and nitrogen removal system （BPNRS）. In design of BPNRS, the anaerobic SRT and anoxic SRT are usually taken as 1 ～ 1.5 d and 1～4 d respectively, the value of aerobic SRT can be taken as the lowest SRT satisfying the function of nitrification multiplied by a safety coefficient, instead of taking a higher value blindly, finally, the general SRT are preferable to be 15 d or so.