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Objective Question & Answer

QUESTION

Objective Question

Q.1

An industrial waste water enters a stream having a BOD concentration of 10 mg/L and a flow of 20 m³/s. If the flow of wastewater is 1.5

m³/s and its BOD concentration is 250 mg/L, then the BOD concentration in the stream at a point downstream of the point of confluence of 

wastewater with the stream will be

A
2.67 mg/L
B
12.09 mg/L
C
13.00 mg/L
D
26.74 mg/L
Answer ( Option D)

26.74 mg/L

Solution

Qw = 1.5 m³/s

BODw = 250 mg/l

Qs = 20 m³/s

BODs = 10 mg/l

BODmix =

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