Determine the mean cell residence time (MCRT) for an activated sludge plant given: the aerator volume is 0.35 million gallons (MG), the final clarifier volume is 0.25 MG, the flow to the aerator is 2 million gallons per day (MGD), the waste activated sludge (WAS) flow is 0.02 MGD, the MLSS is 3000 mg/L, the waste sludge SS is 8000 mg/L, and the final effluent SS is 20 mg/L

Which from the following instrument is commonly used to detect the high pitch butzing sound in bearings? [clo4] a)-digital ultrasonic meter b)-infrared camera c)-spectroscopic d)-vibrometer

Have a greater impact on maintenance productivity than any other support group. (clo5) a)-the top management b)-inventory and purchasing c)-sub-contracting d)-cmms

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?