8833-hw1

# 8833-hw1 - c. Estimate the volume of sludge coming out of...

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Mississippi State University Department of Civil Engineering Fall 1997 CE8833 - Sludge Treatment and Disposal Homework #1 1. Waste activated sludge from an treatment plant is generated at the rate of 0.25 Mgal/ d. There are 10,000 mg/L of solids in the sludge and the sludge has a specific gravity of 1.002. After processing, the solids concentration is 25,000 mg/L and the sludge has a specific gravity of 1.005. Assume no solids are destroyed by the process. a. Write a general equation describing the sludge solids mass balance assuming sludge flow in, concentrated sludge flow out, and a supernatant side stream. b. Write a general equation describing the sludge volume balance assuming sludge flow in, concentrated sludge flow out, and a supernatant side stream
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Unformatted text preview: c. Estimate the volume of sludge coming out of the process if we assume 100% capture d. Estimate the volume of sludge coming out of the process if a side stream has 800 mg/L of solids in it. 2. A sludge has a moisture content of 98% is processed to increase the solids content to 5%. What is the percent reduction in volume (use approximate and more exact method)? Assume that the solids are 70% organic (SG = 1.00) and 30% fixed (SG = 2.50). Also, estimate the specific gravity of the sludge before and after treatment. 3. If the sludge in problem 2. undergoes a process which also removes the organic matter to 50% of its original level, rework the problem as stated....
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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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