SSC JE Civil Engineering 2018 Set 3 Solved Paper

Question : 150 of 200

Marks: +1, -0

A stream has flow of 20 cumecs and BOD concentration of 10 mg/l receives the industrial waste water having flow of 1.5 cumecs and BOD concentration of 250 mg/l. What is the BOD concentration (mg/l) of stream at downstream point of meeting of stream with industrial waste?

2.67
12.09
13
26.74

Validate

Solution:

Q_s

, Discharge of stream = 20 m

^{3}

/sec

D_s

, BOD of stream = 10 mg/l

Q_w

, Discharge of waste water = 1.5 m

^{3}

/ sec

D_w

, BOD of waste water = 250 mg/l
BOD of mix/BOD downstream point of meeting of stream with industrial waste

={Q_s+D_s+Q_wD_w}/{Q_s+Q_w}

= {20+10+1.5×250}/{1.5+20}

= 26.74 mg/l.

Go to Question:

Prev Question

Next Question