sample_exam1 - CE 311 Environmental Engineering I Dr....

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CE 311 Environmental Engineering I Fall 2004 Dr. Kauser Jahan, P.E. MIDTERM EXAM # 1 Circle correct answer (10 points) a. The detention time for a reactor with a flowrate of 10GPD (Gallons per day) and 20 Gallons volume is (i) 2 hours (ii) 2 days (iii) 2 minutes b. The suspended solids concentration in lbs/day in a water treatment plant with a flowrate of 10MGD and a suspended solids concentration of 60 mg/L is (i) 5,004 lbs/day (ii) 30,024 lbs/day (iii) 50,000 lbs/day c. The flowrate of a river is 15 ft 3 /min. The flowrate in gallons/day is (i) 1,600 gallons/day (ii) 161,568 gallons/day (iii) 2,887 gallons/day d. If the calculated diameter for a reactor is 15.58 feet, the design diameter in feet is (i) 15.58 feet (ii) 15 feet (iii) 16 feet e) The normality of a 2000 mg/L sulfuric acid solution is (i) 1N (ii) 0.041N (iii) 5N
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2. (10 points) (a) A 10 MGD wastewater treatment plant has a suspended solids concentration of 80 mg/L. If the plant discharges into the Delaware river (Upstream Flow 3 MGD, Upstream Suspended Solids 5 mg/L), what is the suspended solids concentration in mg/L downstream after the plant discharge? 62.69 mg/L (b) If the New Jersey regulatory agency allows a suspended solids concentration of 30 mg/L in the downstream reach of the river, what concentration of
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sample_exam1 - CE 311 Environmental Engineering I Dr....

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