An oxidation ditch plant, which is a completely mixed process, has an aeration volume of 14.300 nr. The average raw wastewater flow is 13,000 m3/d with a BOD of 315 mg/l and total nitrogen concentration of 50 mg/l. Based on plant records, the operating conditions are MLVSS = 1200 mg/l, pH = 7.0. temperature = 18°C, and waste sludge solids = 1400 kg/d of volatile solids. Calculate the aeration period, volumetric BOD loading, and sludge age. Using evaluation computations as in Example 14.4, determine whether nitrogen oxidation to an ammonia concentration of 2.0 mg/l (essentially complete nitrification) is likely to occur based on the operating conditions.
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