Question

A municipal wastewater treatment plant discharges secondary effluent to a river. the worst condition occurs in the summer when the treated wastewater in summer is found to have a maximum flow rate of 10000 m3 /day, a bod5 of 30 mg/l, dissolved oxygen concentration of 1.5 mg/l and temperature of 25 oc. at upstream of the disposal point the minimum flow in the stream is 0.65 m3 /sec with bod5 of 3.0 mg/l, dissolved oxygen concentration of 7.0 mg/l and temperature of 22 oc. the mixing of wastewater and stream is almost instantaneous at the point of disposal and velocity of the mixture is 0.2 m/sec. explain the self-purification mechanism happening in the river

Answer 1

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