Sewage sludge
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Sewage sludge is separated from the treatment process by sedimentation or flotation. In many cases there is a primary sedimentation (primary sludge) and secondary sedimentation (secondary sludge). Smaller treatment plants often have only one sedimentation tank in which the entire sludge is separated from the treated water. Sewage sludge consists of water and solids that can be divided into mineral and organic (volatile) solids. The quantity and characteristics depend very much on the treatment processes.
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