A factory is discharging wastewater containing 200 mg/L BOD into a river. The river has a...
A factory is discharging wastewater containing 200 mg/L BOD into a river. The river has a discharge of 10 m3/s and the wastewater discharge is 2 m3/s. If the upstream of this river has a BOD of 10 mg/L. Please compute BOD after wastewater is completely mixed with river (any BOD degradation is not considered)
Homework Answers
The discharge is =10 cubic metre/sec
So 10×1000 lites =1000 litres
Upstream BOD = 10mg/litre
Now after waste water total discharge will be
10+2 =12 cubic metre/sec
= 12000 litre
Total Factory discharge = 2 cubic metres/sec
= 2000 litre
BOD = 200 mg/litre
So total BOD after Water water Mixing
= 10000×10 + 2000×200/12000 litres
100,000+400,000mg /12000 litre
= 500,000/12000 = 41.66 mg/litre
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