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4) A surface aerator is used in a square completely mixed aeration basin that has a volume of 250m3. The aeration period is 5h. The standard oxygen transfer rate given by the manufacturer is 2.1kg/kWh. The amount of oxygen required under field conditions is 900kg/d. The coefficients ,, and are 0.9 , 0.85 , and 1.024 , respectively. The operating temperature and DO in the aeration basin are 24C and 1.5 mg/L, respectively. The treatment plant is constructed at the sea level. a) (10p.) Determine the oxygen transfer rate under field conditions ( kg/kWh) b) (10 p.) Estimate the number of aerators required If the surface aerators have a rated power of 12 kW