Question

a stream has a flow of 20000 liters per day with zero pollutant. 2 plants discharge wastewater into this stream. plant A discharges 1000 liters per day with 50 mg/L of pollutant at location B. location B is 100 meters downstream of location a. the environmental regulator requires that no more than 5 mg/L of the pollutant can be present in the stream water at any location.

(a) Draw a system diagram that shows all flows and discharge points. please mark knowns & unknowns.

(b) what are the pollutant concentrations in the stream after location A & B, respectively?

Answer 1

Please refer the attached image for system diagram.

Since degradation of pollutant not mentioned let us assume pollutant as non reactive.