CEE 153 F07 PS3

# CEE 153 F07 PS3 - 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 [email protected] Problem Set # 3 (due Thursday October 25) _____________________________________________________________________________ 1. A water treatment plant is to be designed to treat a flow Q = 0.1 m 3 /sec. a) Particles entering the sedimentation unit have a diameter D = 500 μ m, a porosity η = 0.9, and a solids density ρ s = 1100 kg/m 3 . Determine the required area of the sedimentation unit A such that 80% of these particles will be removed. [286 m 2 ] b) The raw water entering the treatment plant has a total concentration (dissolved plus sorbed) of the pesticide endrin equal to c tot = 0.001 mg/L and a total suspended solids concentration c ss = 100 mg/l. If the sediment-water partition coefficient for endrin is K s = 100 L/kg, determine if 80% solids removal is sufficient for the treatment plant outflow to meet the primary drinking water standard for the total concentration of endrin, c max = 0.0002 mg/L. [most is dissolved so solids removal will not meet standard] 2. A sewage effluent has a total suspended solids concentration TSS = 100 mg/L. Chemical analysis of the effluent indicates the following sediment-water partition coefficients for three organic pollutants: Constituent Sediment-water partition coefficient- K s (L/kg) DDT 1.0 × 10 6 PCB 1.0 × 10 5 Lindane 1.0 × 10 3

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CEE 153 F07 PS3 - UNIVERSITY OF CALIFORNIA LOS ANGELES...

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