hw4_11_chap2 - influent concentration of 125 mg/L. Q = 10...

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CE 311 Environmental Engineering I Fall 2011 Dr. Kauser Jahan, P.E. ASSIGNMENT #4 DUE DATE: Wednesday October 12 , 2011 Undergraduate students can pick one partner and submit one assignment. Make sure both names are on the assignment. Problems from textbook: a) 2-16 b) 2-24 c) 2-26 d) 2-27 e) Disinfection (kill of bacteria by a chemical agent such as chlorine) is a first order reaction. The regulatory agency requires a 99.9999% kill of bacteria in water before distribution. If the disinfection rate is 0.489 min -1 , how long (in minutes) will it take for 99.9999% kill?
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f) A CMFR shown below is being used to treat a pollutant with an
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Unformatted text preview: influent concentration of 125 mg/L. Q = 10 GPM a) What is the volume of the reactor in Gallons? b) What is the detention time in minutes? c) If the pollutant removal is first order and the rate is 0.675 min-1 , what is the pollutant concentration in mg/L leaving the reactor? d) What is the % removal of the pollutant? e) How can the plant increase the removal efficiency to 99.5 % without changing the flowrate or making the current reactor volume larger? Adding another reactor is also not an option . CHANGING k or adding chemicals, changing temperature etc are not allowed. 15 feet 20 feet 12 feet...
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hw4_11_chap2 - influent concentration of 125 mg/L. Q = 10...

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