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A wastewater treatment plant designed for a community of 60,000 people has a flow of 100...

A wastewater treatment plant designed for a community of 60,000 people has a flow of 100 gal/person/day and a biochemical oxygen demand (BOD) loading of 0.2 lb/person/day. The treatment plant has a permit limit for BOD equal to 15 mg/L.

a. (6 pts) What is the concentration (in mg/L) of BOD coming into the plant (i.e., as raw, untreated sewage)?

b. (2 pts) When the treatment plant is treating its waste and meeting its permit limit, what is the removal efficiency (in percent) of the plant?

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