# 8833-2A - Mississippi State University Department of Civil...

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Mississippi State University Department of Civil Engineering CE 8833: Sludge Treatment and Disposal Spring, 1987 Exam 2 Truax Name:_______________________________ 1. A primary sedimentation facility removes 60 percent of the suspended solids and 40 percent of the BOD from a 10 MGD wastewater flow containing 200 mg of suspended solids per liter and having a BOD of 180 mg/l. Assuming that this clarifier produces a sludge of 5 percent solids having a specific gravity of 1.02 (S.G. equals 1.03 for volatile and 2.55 for fixed solids, respectively). This sludge is then loaded into a single-stage anaerobic digester which yields the following operational information: Operating Temperature = 90 o F Ambient Air Temperature = 50 o F Sludge Temperature = 65 o F Mean Cell Residence Time = 7 days BOD Conversion Efficiency = 0.75 Volatile Solids Destruction = 70% Cell Yield = 0.22 lb volatile solids/lb BOD utilized k d = 0.04 day -1 Fixed Solids Capture = 95% Volatile Fixed Solids Capture = 90% Estimate the:

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## This note was uploaded on 06/12/2011 for the course CE 8833 taught by Professor Truax during the Spring '11 term at Mississippi State.

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8833-2A - Mississippi State University Department of Civil...

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