初沉预处理在生活污水处理中的作用试验

The Experiment on the Function of the Pretreatment of the Sedimentation Tank in the Treatment of Domestic Wastewater

采用实验室模拟试验,研究在一般污水处理厂采用的沉淀时间下重力沉淀预处理对生活污水SS的去除效果,并比较未经初沉处理和经过初沉处理的生活污水的后续生化处理效果。结果表明,初沉90 min时污水中SS、TN、TP和总COD的去除率分别为62.9%,4.6%,11.8%,37.7%。预处理后水质变化对后续生化处理的影响不大。在生活污水的生物处理中可以不采用预处理。

Using the laboratory scale simulation test to study the removal of SS of domestic wastewater under the general aeration time of the sewage treatment plant, and had carried on the comparison with the effect of the following biochemical processing with or without the pretreatment. The results showed that the removal efficiency of the sedimentation tank with 90 minutes for SS,TN,TP and COD were 62.87% ,4.6%, 11.82% and 37.67% respectively. The influence of the water quality＇s change after the pretreatment to the following biochemical processing was not in a big way. The pretreatment may not be used in biochemical treatment of the domestic wastewater.