A liquid waste at 20 deg. celcius has ultimate BOD of 250 mg/L, and a decay rate constant of 0.1/day. The liquid waste is discharged into a river at a flow rate of 1 m^3/s. The river is at the same temperature of 20 deg. celcius and contain same type of pollutant as in the liquid waste (same decay rate constant). However, the river has ultimate BOD of 60 mg/L, a width of 20 m, a depth of 5 m, and a flow rate of 9 m^3/s. If there is instantaneous mixing of the waste in the river, determine: a. The ultimate BOD in the river immediately after mixing of the waste mixed with the river. b. The value of BOD5 in the river after mixing of the waste with the river. c. BOD concentration in the river at 60 km downstream from the point of discharge. d.BOD removed at 90 km downstream from the point of discharge.
A liquid waste at 20 deg. celcius has ultimate BOD of 250 mg/L, and a decay rate constant of 0.1/day. The liquid waste is discharged into a river at a flow rate of 1 m^3/s. The river is at the same temperature of 20 deg. celcius and contain same type of pollutant as in the liquid waste (same decay rate constant). However, the river has ultimate BOD of 60 mg/L, a width of 20 m, a depth of 5 m, and a flow rate of 9 m^3/s. If there is instantaneous mixing of the waste in the river, determine:
a. The ultimate BOD in the river immediately after mixing of the waste mixed with the river.
b. The value of BOD5 in the river after mixing of the waste with the river.
c. BOD concentration in the river at 60 km downstream from the point of discharge.
d.BOD removed at 90 km downstream from the point of discharge.
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