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# HW2 - There is negligible input/output other than these two...

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CEE 3510 Prob. Set No. 2 Due: Feb. 17, 2010 1. An industrial plant discharges 100 kg/day of liquids into a disposal pond. Measurements show that 1 kg/day seeps out of the bottom of the pond into the ground and 2 kg/day evaporates into the air. What is the rate of mass accumulation in the pond? 2. Each day 3780 m 3 of wastewater is treated at a municipal wastewater treatment plant. The influent contains 220 mg/L of suspended solids. The “clarified” water has a suspended solids concentration of 5 mg/L. Determine the mass of sludge produced daily from the clarifier. (Sludge = suspended solids removed by clarification from the influent). 3. A freshwater pond has a well-mixed volume equal to 10 6 m 3 . The pond is fed by a single stream and drains by another stream.
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Unformatted text preview: There is negligible input/output other than these two streams. Flow in and out is 10 3 m 3 /day. The inflow stream contains a contaminant with concentration equal to 3.4 mg/L. i) Determine the steady-state concentration of the contaminant in the pond if the contaminant decays in the pond at a rate equal to 0.001 mg/L-day. (15 pts) ii) Determine the steady-state concentration of the contaminant in the pond if the contaminant decays in the pond at a first order rate given by: R = k . C, where k = 0.01/day and C has units of mg/L. (15 pts) 4. Stella Assignment 1—posted on Blackboard in the Assignments folder. A document called ‘Stella Introduction’ is also posted on Blackboard....
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