A high strength waste having an ultimate CBOD of 1,000 mg/L is discharged to a river at a rate of 2 m3 /s. The river has an ultimate CBOD of 10 mg/L and is flowing at a rate of 8 m3 /s. Assuming a reaction rate coefficient of 0.1/day, calculate the ultimate and 5-day CBOD of the waste at the point of discharge (0 km) and 20 km downstream. The river is flowing at a velocity of 10 km/day.

Attached below is the detailed solution

The Ultimate CBOD of waste water at (0) km and 20 Km

= 81.84 mg/l , 67 mg/l

Explanation:

Given Data :

UBOD of waste stream = 1000 mg/l

Volumetric flow rate of waste water = 2 m^3 / s

UBOD of River = 10 mg/l

Volumetric flow rate of river = 8 m^3 / s

reaction rate coefficient = 0.1/day

Velocity of river = 10km/day

The Ultimate CBOD of waste water at (0) km and 20 Km

= 81.84 mg/l   , 67 mg/l

answer:

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