Our drum thickeners have a simple design with low operational costs making them an economical alternative to gravity thickeners, centrifuges and dissolved air flotation units. Solids capture rate is usually greater than 99% with clear filtrate being returned to the wastewater treatment process. Advantages of drum thickeners: Compact and robust construction. Little maintenance due to easy access for changing the filter cloth. Low emissions from the filter drum enclosure. Water saving by reuse of filtrate as spray water for filter cloth washing. Optimal flocculation with variable polymer / sludge ration. Degree of thickening adjustable by variable drum rotation speed. Automatic shutdown in case of failure.