The BOD5 of an effluent from a coke oven plant is 25 mg/L, and the effluent discharge is 4 ML/d. The receiving stream has a BOD5 of 2 mg/L and the stream flow is 40 ML/d. What will be the BOD5 in the stream just below the mixing zone?
Mine water flowing at 1.5 m3/s with 2 mg/l dissolved oxygen, joins river
water flowing at 7 m3/s containing 6 mg/l dissolved oxygen. The saturated value of the dissolved oxygen in the mixture is given to be 9.3 mg/l. On the basis, the initial oxygen deficit of the mixture in mg/l is
