You are using an activated carbon to treat a water contaminated with phenol. the following freundlich isotherm parameters (qe = kf ce n ) were obtained from a phenol isotherm: kf = 28 and n= 0.35 (where ce is in mg phenol/ l water and qe is in mg phenol/ g carbon). in a completely mixed batch reactor (v = 2500 gallons) filled with 2000 gallons of wastewater, you want to reduce the phenol concentration from 10 mg/l to 0.5 mg/l. how much of the activated carbon should you add?

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.

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.