Gravity Belt Thickener Gravity Belt ThickenerIntroduced in 1980, a gravity belt thickener has a gravity drainage zone much like the upper gravity drainage zone of a belt filter press that allows water to drain through a moving, fabric-mesh belt while coagulating and flocculating solids (see Figure 21.17). It originally was designed to be a dewatering pretreatment method, but subsequent improvements have made it suitable for solids thickening. Gravity belt thickeners are currently used to treat aerobically or anaerobically digested solids, alum and lime solids, primary solids, WAS, and blended solids that initially contain between 0.4% and 8% solids. However, in most applications the feed solids concentrations are less than 1.5%.
The Water Environment Federation (WEF): Design of Water Resource Recovery Facilities, Sixth Edition. Gravity Belt Thickener, Chapter (McGraw-Hill Professional, 2018), AccessEngineering