Abstract
Analysis of flocculation caused by the bacterium Actinomadura sp. isolated from domestic sewage was studied in the laboratory using synthetic sewage with the addition of different coagulants: FeCl 3, AlCl 3, Al 2(SO 4) 3 and FeSO 4. The results indicated that the best floc size and settlement properties occurred when synthetic sewage was supplemented with 10 mg litre −1 FeSO 4. The analysis was also applied to brewery effluent samples in a series of experiments testing the natural flora, natural with Actinomadura sp., Actinomadura alone, and sterilized effluent with and without the addition of FeSO 4. The flocs formed varied with respect to their shapes and settlement properties. However, the application of Actinomadura in sterilized effluent samples supplemented with 10 mg litre −1 FeSO 4 allowed the development of remarkably large flocs with good settlement properties. Increase in floc sizes and numbers was observed when the speed of rotation of the effluent samples was increased.
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