Effects of temperature on performances of a slow sand filter used for advanced wastewater treatment
- Received Date: 14/12/2009
- Accepted Date: 11/11/2009
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Key words:
- slow sand filter /
- filtration /
- wastewater reuse /
- temperature
Abstract: 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.