Assignment 4 Fall 2013 Soln

Assignment 4 Fall 2013 Soln - University of Waterloo...

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University of Waterloo DEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING EnvE 472 Wastewater Treatment Fall 2013 Assignment #4 In this assignment you will have the opportunity to: - Apply the activated sludge process equations for COD and nitrogen removal to a variety of treatment conditions 1.) An activated sludge process is operated for bCOD removal and nitrification of the wastewater described in the following table. The HRT in the aeration basin is 6 hours and the concentration of TSS in the aeration basin has been measured and found to have a value of 3000 mg/L. The waste activated sludge stream has been characterized and found to have a flow of 55 m 3 /hour and a TSS concentration of 9000 mg/L. Assuming that the following biokinetics apply: a.) Estimate the concentration of NH 4 -N in the final effluent b.) assuming that 85% of the NH 4 -N is oxidized to NO 3 -N estimate the fixed suspended solids concentration in the raw wastewater FSS= 15mg/L c.) calculate the mass flow of oxygen that the bacteria demand
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