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Unformatted text preview: Homework #2 CE 341 Introduction to Environmental Engineering Due Tuesday, June 21 2011 Summer 2011 Katz 1. The Clearwater water treatment plant uses sodium hypochlorite (NaOCl) to disinfect the treated water before it is pumped to the distribution system. The NaOCl is purchased as a concentrated solution (52,000 mg/L) that must be diluted before it is injected into the treated water. The dilution piping scheme is shown below. The NaOCl is pumped from the small tank called a “day tank” into a small pipe carrying a portion of the clean treated pre-disinfected water (called a slip stream) to the main service line. The main service line carries a flow rate of 0.50 m 3 /sec. The slip stream flows at 4.0 L/sec. At what rate (in L/sec) must the NaOCl be pumped into the slip stream to achieve a concentration of 2.0 mg/L of NaOCl in the service line? Note: Although it is reactive, you may assume that the 2....
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This document was uploaded on 06/15/2011.
- Spring '09