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ENV4001_s11_hw6

# ENV4001_s11_hw6 - ENV 4001 ENVIRONMENTAL SYSTEMS...

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p. 1/3 ENV 4001: E NVIRONMENTAL S YSTEMS E NGINEERING Spring 2011 University of South Florida Homework #6 Civil & Environmental Eng. Due: Wed., March 2, 2011 Prof. J.A. Cunningham Each homework assignment will be graded on a 100-point scale. For this assignment, point values of each problem are indicated. Questions 1-7 all refer to the town of Nastyville and its wastewater discharge. The town of Nastyville dumps its municipal wastewater (sewage) into the Ohio River. The wastewater has undergone primary treatment but not secondary treatment; we’ll learn later in the semester what that means. Just upstream of where the wastewater is dumped in, the river has the following properties during the summer: volumetric flow rate, Q up = 56.6 m 3 /sec average flow velocity, u = 0.122 m/sec river depth, h = 1.83 m river width, w = 254 m concentration of dissolved oxygen = 9.17 mg/L B O D 5 (at 20 °C) = 5.0 mg/L BOD decay coefficient, k L (at 20 °C) = 0.20/day The wastewater stream has the following properties: volumetric flow rate, Q w = 6.6 m 3

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ENV4001_s11_hw6 - ENV 4001 ENVIRONMENTAL SYSTEMS...

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