Filtration is used in addition to regular coagulation and sedimentation for removal of solids from wastewater. Wastewater filtration helps users meet more stringent effluent discharge permit requirements. Filtration, usually considered a simple mechanical process, actually involves the mechanisms of adsorption (physical and chemical), straining, sedimentation, interception, diffusion, and inertial compaction. Filtration does not remove dissolved solids, but may be used together with a softening process, which does reduce the concentration of dissolved solids.

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