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2.HW1.measurement.solution

# 2.HW1.measurement.solution - CEE 330 Homework#1 Due Jan 27...

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1 CEE 330 Homework #1 Due Jan. 27, 2011 Problem 1. (a) During drinking water treatment, 17 lb. of chlorine (Cl) are added daily to disinfect 5 million gallons of water. What is the aqueous concentration of chlorine in mg/L? (b) The chlorine demand is the concentration of chlorine used during disinfection. The chlorine residual is the concentration of chlorine that remains after treatment so the water maintains its disinfecting power in the distribution system. If the residual concentration is 0.20 mg/L, what is the chlorine demand in mg/L? Solution: a) 17 lb. chlorine added to 5 million gallons of water. Chlorine dosage in mg/L: b) Chlorine demand: Problem 2. Coliform bacteria (for example, E. coli) are excreted in large numbers in human and animal feces. Water that meets a standard of less than one coliform per 100 mL is considered safe for human consumption. Is a 1 L water sample that contains 9 coliforms safe for human consumption?

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2.HW1.measurement.solution - CEE 330 Homework#1 Due Jan 27...

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