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?

Two technicians are discussing the intake air temperature (iat) sensor. technician a says that the computer uses the iat sensor as a backup to the engine coolant temperature (ect) sensor. technician b says that the powertrain control module (pcm) will subtract the calculated amount of fuel if the air measures hot. who is correct

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?

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length