Determine the required reactor volume, in million gallons (MG), for a completely mixed, aerobic, activated sludge system which will treat 1 MGD of domestic wastewater. The waste water has an initial ultimate BOD of 200 mg/L. The effluent requirement is 10 mg/L of ultimate BOD. The first order degradation rate constant is K = 0.1 L/mg-day, i. e. the governing equation is q = KSe for calculating the specific substrate utilization rate (q) through kinetic parameters. Se is the effluent ultimate BOD (i. e. 10 mg/L). The mixed liquor volatile suspended solids (X) equals 3,000 mg/L. What is the reactor volume? a. 0.095 MG
b. 0.063 MG
c. 0.92 MG
d. 0.13 MG

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

If the thermal strain developed in polyimide film during deposition is given as 0.0044. assume room temperature is kept at 17.3 c, and thermal coefficient of expansion for the film and the substrate are 54 x 10^-6c^-1 and 3.3 x 10^-6c^-1respectively. calculate the deposition temperature.

An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet