sary to achieve 99.99% kill in a wastewater flow of 100 m3/hr. You may assume that the disinfection process is first-order with a rate constant of 0.2/min. Note: a 99.99% kill percentage means that if 10,000 cells/L enter, only 1 cell/L will “live” through the process. a) Calculate the tank volume required (in m3) if disinfection occurs in a CSTR. b) Calculate the tank volume required (in m3) if disinfection occurs in a PFR. c) Identify the residence time (in hours) for each reactor and
You have been tasked with designing a chlorination tank for killing microorganisms in the effluent from a wastewater treatment plant. It is necessary to achieve 99.99% kill in a wastewater flow of 100 m3/hr. You may assume that the disinfection process is first-order with a rate constant of 0.2/min. Note: a 99.99% kill percentage means that if 10,000 cells/L enter, only 1 cell/L will “live” through the process.
a) Calculate the tank volume required (in m3) if disinfection occurs in a CSTR.
b) Calculate the tank volume required (in m3) if disinfection occurs in a PFR.
c) Identify the residence time (in hours) for each reactor and explain why one system is superior to the other.
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