Thickening wastewater solids reduces the volume of residuals, improves operation, and reduces costs for subsequent storage, processing, transfer, end use, or disposal. For example, thickening liquid-solids slurry from 3 to 6 percent will reduce the volume by 50 percent. There are several different methods for thickening biosolids, including dissolved air floatation DAF , centrifugal thickening, gravity belt thickening, and gravity thickening. Gravity thickening uses the natural tendency of higher-density solids to settle out of liquid to concentrate the solids. Gravity thickeners consist of a circular tank usually with a conical bottom that is fitted with collectors or scrapers at the bottom.
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Gravity thickeners concentrate suspended solids in minerals slurries. These slurries typically are introduced at the center of the tanks and allowed to thicken to the desired density. A key component of any thickener is the feedwell, which has the following functions:. It is critical to introduce the incoming thickener feed in an even and concentric manner in order to overcome short circuiting of fine unsettled solids into the overflow launder.