Assume the wastewater, (Flow = 100 L/min, Cin = 100 mg/L, and k = 0.4 per minute) is to be treated by three equal-volume CSTRs in series. Calculate the total volume of those CSTRs (keep in mind that each of the three is identical) to achieve the desired effluent concentration of 5 mg/L.

An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.