A rapidly mixed tank consists of a treatment unit used to disinfect a solution. The solution enters the 2000 m tank at a rate of 0.4 m/s. The pollutant contains 7.9* CFU per liter and has no 0 mg/l of chlorine. The treatment unit uses a stock solution containing 750 mg/L which is released a rate that will cause the chlorine concentration in the tank to be 2 mgL The chlorine reacts with the water in such a way that it is depleted at a rate (in mg/L-h) given by ra = (-0.45 / h) Ca. When exposed to chlorine, the bacteria die off at a rate (in cells/L-s) given by: 0.03 -Cct -Chact + Cd Thact Img a) Calculate the required flow rate in L/s of the stock solution when the system is operating at steady state, including a schematic of the system. b) Determine the bacterial concentration (in CFU/L) thar should be expected in the effluent from the tank?
A rapidly mixed tank consists of a treatment unit used to disinfect a solution. The solution enters the 2000 m tank at a rate of 0.4 m/s. The pollutant contains 7.9* CFU per liter and has no 0 mg/l of chlorine. The treatment unit uses a stock solution containing 750 mg/L which is released a rate that will cause the chlorine concentration in the tank to be 2 mgL The chlorine reacts with the water in such a way that it is depleted at a rate (in mg/L-h) given by ra = (-0.45 / h) Ca. When exposed to chlorine, the bacteria die off at a rate (in cells/L-s) given by: 0.03 -Cct -Chact + Cd Thact Img a) Calculate the required flow rate in L/s of the stock solution when the system is operating at steady state, including a schematic of the system. b) Determine the bacterial concentration (in CFU/L) thar should be expected in the effluent from the tank?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A rapidly mixed tank consists of a treatment unit used to disinfect a solution. The solution enters the
2000 m tank at a rate of 0.4 m/s. The pollutant contains 7.94 CFU per liter and has no 0 mg/l of
chlorine. The treatment unit uses a stock solution containing 750 mg/L which is released a rate that
will cause the chlorine concentration in the tank to be 2 mg/L. The chlorine reacts with the water in
such a way that it is depleted at a rate (in mg/L-h) given by ra = ( -0.45/ h) Ca.
When exposed to chlorine, the bacteria die off at a rate (in cells/L-s) given by:
Cet
Cbact
Tbact
Img
+ Ca
a) Calculate the required flow rate in L/s of the stock solution when the system is operating at
steady state, including a schematic of the system.
b) Determine the bacterial concentration (in CFU/L) thar should be expected in the effluent from
the tank?
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