Abstract

Abstract Modified laboratory scale activated sludge units were designed and constructed specifically for excess biological phosphorus removal. Once operational several modifications were executed to enhance the removal of phosphorus, these included the improvement of anaerobic conditions; augmentations with acetate and Acinetobacter /Aeromdnas species; increases in sludge age and temperature. The major factor found to influence phosphorus removal was temperature, a 1°C increase resulted in a 2.6% increase in phosphorus removal in the 12–25°C temperature range. During periods of high removal experiments were undertaken to identify the mechanism involved.

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