1) Streeter-Phelps Model – DO sag curve A factory discharges 0.015 m 3 /s of treated effluent into a river whose minimum rate of flow is 0.24 m 3 /s. The depth and width of the river are 1.1 and 8 m,...

1)

Streeter-Phelps Model – DO sag curve

A factory discharges 0.015 m³/s of treated effluent into a river whose minimum rate of flow is 0.24 m³/s. The depth and width of the river are 1.1 and 8 m, respectively. Temperature of the effluent is 35^oC, while that of the river is 28^oC. The BOD5 of the effluent is 10 mg/l and that of the river is 2.7 mg/l. The effluent contains DO of 5.1 mg/l. DO of the river at upstream of the discharge point is 2.3 mg/l. At 20^oC, kL is estimated to be 0.23 day^-1. kR should be calculated from the river’s depth and width. Temperature correction coefficient (q) of 1.047 for kL and 1.024 for kR.

1.1) Draw DO-Sag curve of this phenomenon.

1.2) Show the calculation steps.

1.3) Discuss what happen with the curve you calculated.

1) Streeter-Phelps Model – DO sag curve A factory discharges 0.015 m3/s of treated effluent into a river whose minimum rate of flow is 0.24 m3/s. The depth and width of the river are 1.1 and 8 m, respectively. Temperature of the effluent is 35oC, while that of the river is 28oC. The BOD5 of the effluent is 10 mg/l and that of the river is 2.7 mg/l. The effluent contains DO of 5.1 mg/l. DO of the river at upstream of the discharge point is 2.3 mg/l. At 20oC, kL is estimated to be 0.23 day-1. kR should be calculated from the river’s depth and width. Temperature correction coefficient () of 1.047 for kL and 1.024 for kR. 1.1) Draw DO-Sag curve of this phenomenon. 1.2) Show the calculation steps. 1.3) Discuss what happen with the curve you calculated. 2) Anaerobic Processes Why is the maintenance of a low partial pressure of H2 necessary to the proper functioning of a methanogenic anaerobic culture? Key points : There are two major groups of methanogens. : The roles of both methanogens in the maintenance of a low partial pressure of H2