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Abstract
A 33-cm diameter air diffuser was installed in the bottom of a 3.28-m deep bore hole in the bottom of a 350-m2 pond. Water depth above the diffuser surface was 4.34 m. Air was supplied to the diffuser at 158 L/minute and a pressure of 4.86 m H20. The apparatus was highly effective in transferring oxygen to the water. Standard oxygen transfer efficiency was 28.7%, and the standard aeration efficiency, based on air delivered power, was 6.37 kg 02/kWµhr.