Effects of Sludge Properties on the Thickening and ...
thickening processes used for large municipal wastewater treatment plants in the United States are gravity thickening, dissolved air flotation thickening (DAFT), solid-bowl centrifugation, and gravity belt thickening (GBT) (WEF, 1998). Rotary drum thickeners can also be used, but are most commonly applied in small to medium sized installations.