水温对慢滤池深度处理污水的性能影响

Effects of temperature on performances of a slow sand filter used for advanced wastewater treatment

将慢滤池用于污水二级出水的深度处理,利用一套小试装置研究了水温对慢滤池性能的影响。对比慢滤池在冬季和夏季的运行数据,结果发现：从夏季（23~25℃）转到冬季（10~14℃）时,慢滤池对浊度、COD、色度和细菌总数的去除率分别下降了12.5%、26.5%、22.9%和5.8%。水温下降后,虽然慢滤除污染物的整体效果下降,但却对各污染指标表现出不同的规律：水温对COD去除影响最大,而对浊度去除的影响相对较小。在慢滤进水浊度较低的情况下,水温对色度去除的影响程度会位于对COD去除和浊度去除的影响程度之间。无论温度如何变化,慢滤均能保持良好的细菌去除效果。

A lab scale slow sand filter was operated to polish effluent of a secondary wastewater treatment reactor in Beijing,China.Data of influent and effluent of the slow sand filter were collected in summer and winter.Based on the data,effects of temperature on performances of the slow sand filter were investigated.All results show that,removal rates of turbidity,COD,color and total bacterial counts decreased by 12.5%,26.5%,22.9% and 5.8%,respectively when temperature dropped from 23~25℃ in summer to 10~14℃ in winter.Temperature varieties have a bigger inhibition effect on COD removal than on turbidity removal.With low turbidity influent of slow sand filter,the extent of inhibition effect on color removal must be between that of COD removal and that of turbidity removal.The slow sand filter maintained a satisfied and stable bacterial removal performance in both seasons.