ees3040HW7solns_fa10

ees3040HW7solns_fa10 - EES 3040 Homework 7 Solutions...

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1 EES 3040 Homework 7 Solutions Reading Assignment: D&M1 Ch 1, p. 14; Ch 9 (all) or D&M2 Ch 10 (all). Internet Problem 1. (3 pts.) Define the following, using 3-4 sentences for each: For more information, see the text and the EPA websites http://www.epa.gov/safewater/standard/setting.html , http://www.epa.gov/safewater/mcl.html a.) MCL: Maximum Contaminant Level; this is the primary drinking water standard established by EPA. These standards must be met. (see D&M1 Ch 9, pp. 327-328 or D&M2 Ch 10, p. 410) b.) MCLG or SMCL: Maximum Contaminant Level Goal or Secondary MCL: This is the secondary or goal drinking water standard established by EPA. These standards are based on aesthetics and non-health goals, and are not required to be met. (see D&M1 Ch 9, p. 354 or D&M2 Ch 10, p. 410) c.) THM: Trihalomethanes are a group of four chemicals that form when chlorine reacts with organic matter. THMs are suspected carcinogens. (see D&M1Ch 9, p. 355 or D&M2 Ch 10 p. 438-439) d.) (1.5 pts.) The 2009 City of Tallahassee Water Quality Report may be found at http://talgov.com/you/water/pdf/2008_wqr.pdf Contaminant MCL MCLG MCL Violations? Range Likely Source Nitrate (as nitrogen) 10 ppm 10 ppm No 0.021-0.6 ppm Runoff, septic tanks, erosion Tetrachloroethylene 3 ppb 0 ppb No ND – 1.02 ppb Erosion of natural deposits Total THMs 80 ppb N/A No 0.3 - 23 ppb By-product of disinfection Problem 2. a.) (2 pts.) Draw a flow diagram of a typical water treatment system for treating surface water. See text Figure 9-2/10-2. Since surface water typically has high turbidity due to colloids and low water hardness, coagulation and flocculation should be used here. b.)
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ees3040HW7solns_fa10 - EES 3040 Homework 7 Solutions...

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