8833-2.f97 - Mississippi State University Department of...

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Mississippi State University Department of Civil Engineering CE8833: Sludge Treatment and Disposal Fall 1997 Exam II D. D. Truax Name: Using the exam as a cover, present your solutions on separate paper in numerical order. Attach the solution sheets to this exam with a staple in the upper lefthand corner. Clearly and neatly present your solution with the final answer clearly indicated (e.g., circled, boxed, underlined) and start each problem on a new sheet. If a reference other than your notes is used, cite that reference. No help may be given or received on this exam. Each of the following problems are of equal value. 1. Sufficiently 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, d) when and why sludge lagoons should be deep, and e) the processes behind heat conditioning. 2. A two-stage anaerobic digester is operating at 130 o F which yields about 16 lb of gas produced per lb of VSS destroyed. Sludge flow rate into the system is 35,000 gpd and it is to have a hydraulic detention time of 15 days in each stage ignoring volume loss due to sludge accumulation, etc. The volatile solids concentration of the sludge is 8,400 mg/L entering the
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8833-2.f97 - Mississippi State University Department of...

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