Secondary Treatment 2
Secondary Treatment 2 : Waste-water treatment, beyond the primary state, in which bacteria consume the organic parts of the wastes. This biochemical action is accomplished by use of trickling filters or the activated-sludge process. Effective secondary treatment removes virtually all floating and settable solids and approximately 90% of both BOD5 and suspended solids. Customarily, disinfection by chlorination is the final stage of the secondary-treatment process. (Bul D11)
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