An industry generates 4 million gallons per day (MGD) (that is 15,000 m^3/ day) of liquid industrial wastewater having BOD5 of 1000 mg/L and first order reaction rate constant of 2.0/day. Because of the high BOD, there is a plan to build an industrial pre-treatment system at an industrial park. Effluent from the pre-treatment will be discharged into the city sewer for final polishing at the city wastewater treatment plant. Determine: a. Percent BOD removal if the wastewater is treated in one 5000 m^3 continous flow stirred tank reactor. b. Percent BOD removal if the wastewater is treated in one 5000 m^3 plug flow reactor. c. Percent BOD removal if the wastewater is treated in one 2500 m^3 continous flow stirred tank reactor followed by one 2500 m^3 plug flow reactor. d. Percent BOD removal if the wastewater is treated in one 2500 m^3 plug flow reactor followed by one 2500 m^3 continous flow stirred tank reactor. e. Percent BOD removal if the wastewater is treated in one 2500 m^3 continous flow stirred tank reactor followed by another 2500 m^3 continous flow stirred tank reactor (two CSTRs in series).
An industry generates 4 million gallons per day (MGD) (that is 15,000 m^3/ day) of liquid industrial wastewater having BOD5 of 1000 mg/L and first order reaction rate constant of 2.0/day. Because of the high BOD, there is a plan to build an industrial pre-treatment system at an industrial park. Effluent from the pre-treatment will be discharged into the city sewer for final polishing at the city wastewater treatment plant.
Determine:
a. Percent BOD removal if the wastewater is treated in one 5000 m^3 continous flow stirred tank reactor.
b. Percent BOD removal if the wastewater is treated in one 5000 m^3 plug flow reactor.
c. Percent BOD removal if the wastewater is treated in one 2500 m^3 continous flow stirred tank reactor followed by one 2500 m^3 plug flow reactor.
d. Percent BOD removal if the wastewater is treated in one 2500 m^3 plug flow reactor followed by one 2500 m^3 continous flow stirred tank reactor.
e. Percent BOD removal if the wastewater is treated in one 2500 m^3 continous flow stirred tank reactor followed by another 2500 m^3 continous flow stirred tank reactor (two CSTRs in series).
f. Percent BOD removal if the wastewater is treated in one 2500 m^3 plug flow reactor followed by another 2500 m^3 plug fllow reactor (two plug flow reactors in series).
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