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

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Mississippi State University Department of Civil Engineering CE 8833: Sludge Treatment and Disposal Spring 1996 Exam 2 Truax Name:_________________________________________________ (15%) 1. Briefly explain: a) the Lime Stabilization Process, b) why/when sludge conditioning is needed, c) the differences in solids destruction mechanism between aerobic and anaerobic digestion, and d) when and why sludge lagoons should be deep and when and why they should be shallow. (15%) 2. A sludge thickener is to treat 0.25 Mgal/d of sludge having a concentration of 6,500 mg/l. Tests indicate that a loaded of the 1.1 lb of dry sludge solids/sq ft/hr is acceptable if 25 lb of polymer per ton (2000 lb) dry sludge solids is added. This design will produce a thickened sludge having a specific gravity of 1.025 and a solids content of 6.5 percent. Determine: a) Surface area of the thickener (sq. ft.) and b) Volume of sludge produced (gallons per day). (35%) 3. A two-stage anaerobic digester is operating at 125 o F which yields about 15 lb of gas produced per lb of VSS destroyed.
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