An industry has decided to treat its process wastewater in a biotower with a plastic modular medium (n = 0.55). The flow rate of the wastewater is 1400 m3 /d with a BOD5 of 630 mg/l. Average summer and winter temperatures are 22°C and 15°C, respectively. The treatability constant is 0.04 min–1 for the system at 20°C. Depth of the medium is 4 m. Calculate the area of the biotower required to produce an effluent with a BOD5 of 20 mg/l, with a recycle ratio of 2:1. b) Rework problem a) using a winter recirculation ratio of 3:1. Summer recirculation ratio remains the same at 2:1. Comment on the pros and cons of using a higher recirculation ratio
An industry has decided to treat its process wastewater in a biotower with a plastic modular medium (n = 0.55). The flow rate of the wastewater is 1400 m3 /d with a BOD5 of 630 mg/l. Average summer and winter temperatures are 22°C and 15°C, respectively. The treatability constant is 0.04 min–1 for the system at 20°C. Depth of the medium is 4 m. Calculate the area of the biotower required to produce an effluent with a BOD5 of 20 mg/l, with a recycle ratio of 2:1. b) Rework problem a) using a winter recirculation ratio of 3:1. Summer recirculation ratio remains the same at 2:1. Comment on the pros and cons of using a higher recirculation ratio
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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a) An industry has decided to treat its process wastewater in a biotower with a plastic modular medium (n = 0.55). The flow rate of the wastewater is 1400 m3 /d with a BOD5 of 630 mg/l. Average summer and winter temperatures are 22°C and 15°C, respectively. The treatability constant is 0.04 min–1 for the system at 20°C. Depth of the medium is 4 m. Calculate the area of the biotower required to produce an effluent with a BOD5 of 20 mg/l, with a recycle ratio of 2:1.
b) Rework problem a) using a winter recirculation ratio of 3:1.
Summer recirculation ratio remains the same at 2:1. Comment on
the pros and cons of using a higher recirculation ratio
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