An aerated lagoon with a 10-ft depth and liquid volume of 175,000 cu ft treated an average of 0.2 mgd of wastewater with a BOD of 450 mg/l. The anticipated temperature extremes of the aerating wastewater range from 10° to 30°C. The two 25-hp surface aerators were recommended for adequate mixing. Based on laboratory treatability studies, the wastewater has the following characteristics: k10 = 0.68 per day, C1 = 2.0, α = 0.9, β = 0.8, and an oxygen utilization rate of 1.0 lb oxygen/lb BOD. Is the lagoon adequately sized? Are the aerators adequate? Will the lagoon meet an effluent BOD requirement of 50 mg/l?
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