对《室外排水设计标准》中二沉池设计方法的讨论与建议

Discussion and proposals on the design of final clarifier of Standard for design of outdoor wastewater engineering

很多污水处理厂的运行实践过程中经常会出现“翻泥”现象,这一现象主要是季节性的污泥沉降性能变化所致,阐述了国内二沉池的设计方法及存在的主要问题,重点对污泥沉降性能对二沉池的影响进行了论述,回顾了国际上二沉池的理论发展,总结了当前国际上基于固体通量理论的状态点分析、DAIGGER法以及以ATV、STOWA为代表的经验法,并对上述方法的适用性进行了讨论。指出了状态点分析法是二沉池设计的普适性方法,并对该方法进行了实际测试,建议国内设计标准在今后修订时参考该方法。

Sludge washout from secondary clarifier often can be seen in many wastewater treatment plants in China,which is mostly caused by sludge settling performance changing.Domestic secondary clarifier design approach and the main problems be proposed,which is mainly focused on the influence of the sludge settling performance on the secondary clarifier,reviews the theoretical development of the international secondary clarifier,and summarized the current international state point analysis based on solid flux theory,DAIGGER approach and empirical approach represented by ATV and STOWA,and the applicability of the above approaches is discussed.It is pointed out that the state point analysis is a universal approach for the design of secondary clarifier,and the method is tested in practice.It is recommended that domestic design standards should refer to this approach when it be revised in the future.