Abstract
The characteristics of biological aerated filter (BAF) backwashing sludge and the combined coagulation efficiency of chemical coagulant and biological sludge, and the properties of the settled sludge produced in the utilization process were investigated. The results showed that the backwashing sludge had preferable biological flocculation ability. A promising treatment performance, which sufficed the influent requirement of BAF was observed whether by using the backwashing sludge or combined using chemical coagulant and biological sludge in the enhanced domestic wastewater pretreatment process. The removal efficiency of COD, SS and TP were up to 74.6%、81.9% and 84.2% respectively where as backwashing sludge dosage was 38~76mg and FeCl3 dosage was 30mg per liter domestic wastewater.
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