Abstract
Standardized aeration tests were conducted for a tractor-powered paddlewheel aerator of the type often used for emergency aeration of fish ponds. The greatest oxygen transfer coefficient (30.0 hour−1) and oxygen transfer rate (35.1 kg of oxygen per hour) were obtained at 108 rpm (revolutions per minute) and 54 cm paddle depth. All trials at 108 or 128 rpm with paddle depths of 36 cm or more had oxygen transfer coefficients and rates greater than 20 hour−1 and 20 kg of oxygen per hour, respectively. There was good agreement between the size and shape of spray patterns and oxygen transfer coefficients and rates.
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