Design a layout for an aerated lagoon followed by two secondary facultative ponds to treat a combined food-processing and domestic waste water. The design flow is 200,000 gpd containing 1100 lb of BOD. The water temperatures in the aerated lagoon are expected to range from 2°C in winter to 25°C in summer. Determine the size and shape of the aerated lagoon and the number and horsepower of the surface aerators based on the following parameters: α = 0.9, β= 0.8, K = 0.90 per day at 20°C, a = 1.0 lb of oxygen required per lb of BOD removed, a minimum of 80% BOD removal, and an aerator oxygen transfer rate R0 = 2.33 lb of oxygen/hp • hr. The BOD loading on the two facultative ponds receiving the aerated wastewater is limited to 20 lb BOD/acre/day, and the storage volume of the ponds between the minimum water depth of 1.5 ft and maximum of 5.0 ft must be equal to or greater than 4 months of wastewater discharge at design flow.
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