Question

6. An industry generates 4 million gallons per day (MGD) (that is 15,000m³/day) of liquid industrial wastewater having BOD? of 1000 mg/L and reaction rate 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 5000m³ continuous flow stirred tank reactor. 5 pts b. Percent BOD removal if the wastewater is treated in one 5000m³ plug flow reactor. 5pts c. Percent BOD removal if the wastewater is treated in one 2500m³ continuous flow stirred tank reactor followed by one 2500m³ plug flow reactor. 10 pts d. Percent BOD removal if the wastewater is treated in one 2500m³ plug flow reactor followed by one 2500m³ continuous flow stirred tank reactor. 10 pts e. Percent BOD removal if the wastewater is treated in one 2500m³ continuous flow stirred tank reactor followed by another 2500m³ continuous flow stirred tank reactor (two CSTRs in series). 10 pts f. Percent BOD removal if the wastewater is treated in in one 2500m³ plug flow reactor followed by another 2500m³ plug flow reactor (two plug flow reactors in series). 20 pts

          6. An industry generates 4 million gallons per day (MGD) (that is 15,000m³/day) of liquid industrial wastewater having BOD? of 1000 mg/L and reaction rate 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 5000m³ continuous flow stirred tank reactor. 5 pts
b. Percent BOD removal if the wastewater is treated in one 5000m³ plug flow reactor. 5pts
c. Percent BOD removal if the wastewater is treated in one 2500m³ continuous flow stirred tank reactor followed by one 2500m³ plug flow reactor. 10 pts
d. Percent BOD removal if the wastewater is treated in one 2500m³ plug flow reactor followed by one 2500m³ continuous flow stirred tank reactor. 10 pts
e. Percent BOD removal if the wastewater is treated in one 2500m³ continuous flow stirred tank reactor followed by another 2500m³ continuous flow stirred tank reactor (two CSTRs in series). 10 pts
f. Percent BOD removal if the wastewater is treated in in one 2500m³ plug flow reactor followed by another 2500m³ plug flow reactor (two plug flow reactors in series). 20 pts

6. An industry generates 4 million gallons per day (MGD) (that is 15,000m³/day) of liquid industrial wastewater having BOD? of 1000 mg/L and reaction rate 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 5000m³ continuous flow stirred tank reactor. 5 pts
b. Percent BOD removal if the wastewater is treated in one 5000m³ plug flow reactor. 5pts
c. Percent BOD removal if the wastewater is treated in one 2500m³ continuous flow stirred tank reactor followed by one 2500m³ plug flow reactor. 10 pts
d. Percent BOD removal if the wastewater is treated in one 2500m³ plug flow reactor followed by one 2500m³ continuous flow stirred tank reactor. 10 pts
e. Percent BOD removal if the wastewater is treated in one 2500m³ continuous flow stirred tank reactor followed by another 2500m³ continuous flow stirred tank reactor (two CSTRs in series). 10 pts
f. Percent BOD removal if the wastewater is treated in in one 2500m³ plug flow reactor followed by another 2500m³ plug flow reactor (two plug flow reactors in series). 20 pts

Added by Michelle F.

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