1.) Surface aerators were installed at a wastewater treatment plant to provide oxygen to an activated - sludge process. Before wastewater was allowed into the plant, nonsteady-state oxygen transfer tests were done with clean water. At T = 150C, KLa = 8.4hr-1. The plant's peak load comes in the summer when the water temperature is 280C and the required oxygen transfer rate is 50,000 kgO2/d. The following are plant design values: Aeration Basins Water depth = 3m width = 50 m length = 80m elevation above sea level = 100m depth of air header = 6.5m no. of diffusers per tank = 250 Settler overflow rate = 20 m/d recycle ratio = 0.33 underflow concentration = 1.2% Mixed Liquor MLSS = 3000 mg/L alpha = 0.85 Beta = 0.9 minimum D.O. = 1.3 mg/L F:M 0.3 kgBODL/ kgMLSS-d Do you think the aeration system can supply the aeration needs during peak loading? Ignore any pressure effects on C* . =
1.) Surface aerators were installed at a wastewater treatment plant to provide oxygen to an activated - sludge process. Before wastewater was allowed into the plant, nonsteady-state oxygen transfer tests were done with clean water. At T = 150C, KLa = 8.4hr-1. The plant's peak load comes in the summer when the water temperature is 280C and the required oxygen transfer rate is 50,000 kgO2/d. The following are plant design values: Aeration Basins Water depth = 3m width = 50 m length = 80m elevation above sea level = 100m depth of air header = 6.5m no. of diffusers per tank = 250 Settler overflow rate = 20 m/d recycle ratio = 0.33 underflow concentration = 1.2% Mixed Liquor MLSS = 3000 mg/L alpha = 0.85 Beta = 0.9 minimum D.O. = 1.3 mg/L F:M 0.3 kgBODL/ kgMLSS-d Do you think the aeration system can supply the aeration needs during peak loading? Ignore any pressure effects on C* . =
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:1.) Surface aerators were installed at a wastewater
treatment plant to provide oxygen to an activated -
sludge process. Before wastewater was allowed into the
plant, nonsteady - state oxygen transfer tests were done
with clean water. At T = 150C, KLa = 8.4hr-1. The
plant's peak load comes in the summer when the water
temperature is 280C and the required oxygen transfer
rate is 50,000 kgO2/d. The following are plant design
values: Aeration Basins Water depth = 3m width = 50
m length = 80m elevation above sea level = 100m
depth of air header = 6.5m no. of diffusers per tank
= 250 Settler overflow rate = 20 m/d recycle ratio
= 0.33 underflow concentration = 1.2% Mixed Liquor
MLSS = 3000 mg/L alpha = 0.85 Beta = 0.9
minimum D.O. = 1.3 mg/L F:M = 0.3 kgBODL/
kgMLSS-d Do you think the aeration system can supply
the aeration needs during peak loading? Ignore any
pressure effects on C*.
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