A sewage lagoon that has a surface area of 50,000m2 and a depth of 2m is receiving 8500m3d-1 of sewage containing 150mg/L of biodegradable contaminants. At steady state, the effluent from the lagoon must not exceed 20mg/L of biodegradable contaminant. Assuming the lagoon is well mixed and that there are no losses or gains of water in the lagoon other than the sewage input. What is the biodegradation reaction rate (d-1) for a first order reaction

Slip occurs via two partial dislocations because of (a) the shorter path of the partial dislocation lines; (b) the lower energy state through partial dislocations; (c) the charge balance.

How to increase the thermal officiency of an ideal simple rankino cycle? among these methods, which one is the best and why?

At steady state, air at 200 kpa, 325 k, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. the inlet cross-sectional area is 6 cm2. at the duct exit, the pressure of the air is 100 kpa and the velocity is 250 m/s. neglecting potential energy effects and modeling air as an 1.008 kj/kg k, determine ideal gas with constant cp = (a) the velocity of the air at the inlet, in m/s. (b) the temperature of the air at the exit, in k. (c) the exit cross-sectional area, in cm2