ees3040HW8solns_fa10

ees3040HW8solns_fa10 - EES 3040 Homework 8 Solutions...

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1 EES 3040 Homework 8 Solutions Reading Assignment: Ch 10, pp. 372-386, 390-400, 409-428; D&M Ch 11, pp. 458-476, 480-485, 495-515; EPA and Wikipedia ( http://www.epa.gov/npdes/pubs/bastre.pdf ) and ( http://en.wikipedia.org/wiki/Sewage_treatment ) Problem 1. (3 pts.) Sketch and label the flow diagram of a wastewater treatment facility that includes pretreatment, primary and secondary treatment with activated sludge. Briefly describe each process (1-2 sentences for each). See D&M1 Chapter 10, Figure 10-14 and pp. 398-399 or D&M2 Chapter 11, Figure 11-12 Problem 2. (4 pts.) D&M1 Chapter 10 Review 3 (pg. 428) or D&M2 Chapter 11 Review 2 (pg. 516 29 . Explain the differences among pretreatment, primary treatment, secondary treatment, and tertiary treatment, and show how they are related. Pretreatment: uses physical processes to remove large and dense objects that may damage the WWTP equipment. This is done before primary treatment. See D&M1 pgs. 383-386 Primary treatment: uses physical processes to remove pollutants that float and settle. This removes the suspended solids (SS) and some BOD. See D&M1 pgs. 383, 390-391 Secondary treatment: uses biological processes to degrade wastes. This removes most of the BOD in the wastewater. See D&M1 pgs. 383, 391, 396-399, 409, 411-412 Tertiary treatment: removes pollutants leftover (additional SS and BOD, nutrients, metals,
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ees3040HW8solns_fa10 - EES 3040 Homework 8 Solutions...

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