A line-bubble aeration basin has a flow of 21.5 mgd, an influent BOD of 180 mg/l, 31 mg/l of ammonia, and effluent of 10 mg/l. During the winter, the wastewater temperature of 14.8°C does not nitrify. During the summer, wastewater temperatures increase to 18.5°C and operators cannot avoid nitrification. The residual DO is controlled to maintain 2.0 mg/l. Diffusers are 15 - ft deep. Use average oxygen transfer values for αF and β. Calculate (1) winter and (2) summer values for oxygen demand, oxygen transfer, hp, and airflow rate.
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