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Sewage treatment may also be referred to as wastewater treatment, although the latter is a broader term which can also be applied to purely industrial wastewater. Surface runoff and effluents from small-scale industries or pre-treated industrial wastewaters are sometimes routed through municipal sewage treatment plants when the environmental advantages of treatment outweigh the disadvantages of reduced treatment efficiency. Dilution of sewage by storm water runoff or industrial wastewater with low biochemical oxygen demand (BOD) decreases the efficiency of secondary treatment; because secondary treatment ecosystems require a minimum concentration of biologically decomposable waste to sustain the ecosystem population.

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