engineering recuitment UPSSSC JE Civil 2024 Mock Test Environmental Engineering Sewage Sewage Treatment
A drain carrying sewage of BOD = 180 mg/l and flow rate of 40 m3/s joins a river whose upstream BOD is 8 mg/l and flow rate is 500 m3/s. Assume immediate and complete mixing of drain with the river. What is the estimated downstream BOD of the river flow?
1
70.4 mg/l
2
104.5 mg/l
3
20.74 mg/l
4
25.4 mg/l