aos104f10.hw1

aos104f10.hw1 - 1 Exhaust gas from a particular automobile...

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Unformatted text preview: 1. Exhaust gas from a particular automobile contains 1.25% by volume of carbon monoxide. Express this concentration in mg/m 3 at 1 atm pressure and 25°C temperature. 2. Five million gallons per day (MGD) of wastewater, with a concentration of 10.0 mg/L of a conservative pollutant, is released into a stream having an upstream ¡ow of 10 MGD and pollutant concentration of 3.0 mg/L. [This problem shows the typical U.S. practice of using non-metric units for most everything except small concentration values and standards.] a. What is the concentration in ppmm just downstream? b. How many pounds of substance per day pass a given spot downstream? 3. A lake with constant volume 10 × 10 6 m 3 is fed by a pollution-free stream with ¡ow rate 40 m 3 /s. A factory dumps 5 m 3 /s of a nonconservative waste with concentration 150 mg/L into the lake. The pollutant has a decay rate coef¢cient K of 0.25/day. Assuming the pollutant is well-mixed in the lake, ¢nd the steady-state concentration of pollutant in the lake.well-mixed in the lake, ¢nd the steady-state concentration of pollutant in the lake....
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This note was uploaded on 10/19/2010 for the course A&O SCI 104 taught by Professor Lew during the Fall '10 term at UCLA.

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