Homework 2

Homework 2 - E NVE 331, Winter 2009 Homework #2 Due on...

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ENVE 331, Winter 2009 Homework #2 Due on February 4 th 2009 Mass Balance Problems: Problem 1: Alcohol containing 15% salt is fed at a rate of 10 kg/min in a mixer (CSTR) that initially holds 100 L of 5% salt in alcohol. The exit solution leaves the mixer at a rate of 10 kg/min. Determine the exit concentration after 30 minutes in ppm and assume complete mixing. The density of alcohol is 0.8 g/mL and can be assumed constant due to low salt concentration. Problem 2: A CSTR is running at steady state with a flowrate of 50 mL/min. At any instant of time you started injecting a dye (2 mL/min with a dye concentration of 100 g/L) in the inlet line and continued to do so. The inlet flow rate turned to (50+2) 52ml/min and the volume of the CSTR is 2500 ml. No reaction occurs in the reactor. Find the concentration of the dye after 15 and 30 minutes. Problem 3: A lake with a surface area of 1.13 mi 2 , is fed by a river with a flow rate of 5000 cfs. The flow rate in the river exiting the lake is 6000 cfs. A wastewater treatment plant discharges into the lake at the
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Homework 2 - E NVE 331, Winter 2009 Homework #2 Due on...

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