A step-aeration activated-sludge system at a loading of 40 lb of BOD/1000 ft3/day requires an air supply of 1200 ft3/lb of BOD applied to maintain an adequate dissolved-oxygen level. The measured average oxygen utilization of the mixed liquor is 36 mg/l/hr. Calculate the oxygen transfer efficiency. (Assume 0.0174 lb of oxygen per cubic foot of air, which is the amount at 20°C and 760 mm pressure.)
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