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secondary treatment

Second step in most waste treatment systems during which bacteria consume the organic parts of the wastes. This is accomplished by bringing the sewage, bacteria and oxygen together in trickling filters or within an activated sludge process. Secondary treatment removes all floating and settleable solids and about 90 per cent of the oxygen-demanding substances and suspended solids. Disinfection by chlorination is the final stage of the secondary treatment process. See also tertiary treatment.

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