CEE 153 F07 PS2

CEE 153 F07 PS2 - UNIVERSITY OF CALIFORNIA, LOS ANGELES...

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UNIVERSITY OF CALIFORNIA, LOS ANGELES Civil and Environmental Engineering Department CEE 153 Introduction to Environmental Engineering Science Fall Term 2007 T-Th 2-4 PM 4000A Math Science Prof. K. D. Stolzenbach 5732J Boelter Hall, 206-7624 stolzenb@ucla.edu Problem Set # 2 (due Thursday October 18) _____________________________________________________________________________ 1. Leachate (water with dissolved constituents) seeps from a landfill into a river at a rate Q e = 0.01 m 3 /sec. The river has a steady flow Q a = 10 m 3 /sec and a cross-sectional area A = 100 m 2 . The concentration of an organic pollutant dioxolane downstream from the region of initial mixing between the leachate and the river flow is c m = 1.0 mg/L. The ambient concentration of dioxolane is c a = 0. a) What is the mass flow ± m e of dioxolane from the landfill into the river? [0.01 kg/sec] b) What is the concentration c e of dioxolane in the leachate? [1000 mg/L] c) As the dioxolane is carried downstream by the river, the concentration of dioxolane decreases as a result of a reaction with a first-order rate k r = 0.1/day. If the drinking water standard specifies that water have a dioxolane concentration less than 0.001 mg/L, how far downstream will the water be unsafe to drink (without additional treatment to remove dioxolane)? [597 km]
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2. Rain falls steadily on a watershed with an area A
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CEE 153 F07 PS2 - UNIVERSITY OF CALIFORNIA, LOS ANGELES...

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