Assignment 6 sol

Assignment 6 sol - Ans: 1) Tank Volume = Q / (24 / HRT) =...

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Due date: 24/11/2005 CIVL242: Water and Wastewater Engineering Assignment 6 1. An AS system treats 20,000 m3 sewage per day under the following conditions: Influent BOD5 = 250 mg/L Hydraulic retention time (HRT) in the aeration tank= 8 hours MLSS = 2000 mg/L Please calculate: 1) the tank volume 2) the F/M ratio 3) To keep the F/M at 0.6, what will be an appropriate MLSS level?
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Unformatted text preview: Ans: 1) Tank Volume = Q / (24 / HRT) = 20,000 (m 3 /day) / [24 (hrs/day) / 8 hrs] = 20,000 / 3 m 3 = 6,666.666 m 3 6, 700m 3 2) F/M = Q S / X V = [(20,000 m 3 /day)(250 mg /L)] / [(2,000 mg /L)( 6, 700m 3 )] = 0.375 day-1 3) MLSS = Q S / (F/M) V = [(20,000 m 3 /day)(250 mg /L)] / [(0.6 day-1 )( 6, 700m 3 )] = 1250 mg MLSS/L...
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This note was uploaded on 09/13/2011 for the course CIVL 242 taught by Professor Gh during the Fall '09 term at HKUST.

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