Disc7_15Mar - CEE 320 Discussion 15-Mar-10 Ethanol(CH3CH2OH...

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CEE 320 Discussion 15-Mar-10 Ethanol (CH 3 CH 2 OH) is a solvent used in liquid detergents. If this ethanol escapes to the atmosphere, it contributes to photochemical smog formation. Recent research has shown that little of the ethanol escapes during detergent use, but instead is drained to the sewer. Once in the sewer, the ethanol can have three fates: (1) volatilization to the atmosphere, (2) biochemical oxidation to CO 2 and H 2 O (by microbes!), or, (3) discharge from the sewer into the wastewater treatment plant unaltered. In this problem, you are to compute the relative importance of these fates for specified conditions. Assume that the flow through the sewer is constant. Use a plug- flow reactor description of the sewer. Assume that the ethanol that remains in the water is biodegraded by a first-order process with rate constant k . Assume that ethanol release from the sewer to the atmosphere occurs according to the model we derived in class for interfacial mass transfer. Data Cs = 0 Ethanol concentration in sewer water in equilibrium with ethanol in air (i.e.
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