Conventional Clarifier

Conventional circular clarifiers are commonly used in municipal wastewater treatment in order to reduce BOD and suspended solids content from the wastewater prior to the main biological treatment. Typically, a well designed primary clarifier should be able to remove up to 30% of the BOD from municipal wastewater with an HRT of 30 min and a BOD concentration of 200-300 mg/L. Secondary clarification is the final process for generating a good quality effluent in numerous activated sludge processes. An adequate surface loading rate is commonly used in order to determine the clarifier area.