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materials that may either float or readily settle out by gravity. It contains the bodily processes of screening, comminution, grit removal, and sedimentation. Screens are manufactured from long, carefully spaced, slender metallic bars.   In fashionable crops the screens are cleaned mechanically, and the fabric is promptly disposed of by burial on the plant grounds. A comminutor could also be used to grind and shred particles that passes via the screens. The shredded materials is removed later by sedimentation or flotation processes. The main sludge pumped from the underside of the first clarifiers in step three, together with the continual flow of waste

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