A river has ultimate BOD of 60 mg/L, a width of 20 m, a depth of 5 m and a flow rate of 9 m3/s. A waste at 20°C having ultimate BOD of 250 mg/L, a decay rate constant of 0.1/day, and flow rate of 1 m% is discharged into the river. The river and the waste are at the same temperature of 20°C and contain the same pollutant (same decay rate constant). If there is instantaneous mixing of the waste in the river, determine: a. Ultimate BOD in the river immediately after mixing of the waste mixed with the river. b. The value of BOD in the river five days after mixing of the waste with the river. c. BOD concentration in the river at 50 km downstream from the point of discharge. d. BOD removed at 95 km downstream from the point of discharge
A river has ultimate BOD of 60 mg/L, a width of 20 m, a depth of 5 m and a flow rate of 9 m3/s. A waste at 20°C having ultimate BOD of 250 mg/L, a decay rate constant of 0.1/day, and flow rate of 1 m% is discharged into the river. The river and the waste are at the same temperature of 20°C and contain the same pollutant (same decay rate constant). If there is instantaneous mixing of the waste in the river, determine:
a. Ultimate BOD in the river immediately after mixing of the waste mixed with the river.
b. The value of BOD in the river five days after mixing of the waste with the river.
c. BOD concentration in the river at 50 km downstream from the point of discharge.
d. BOD removed at 95 km downstream from the point of discharge
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