Abstract
A sequence of a substrate rich and substrate starvation phase (feast and famine strategy) is created in both compartmentalized reactors and reactors with premixing tanks. This condition is known to be essential in the control of bulking. With a synthetic waste water containing glucose a reactor with 12 compartments was effective in the control of filamentous bulking. With a dairy industrial waste water, containing a slowly biodegradable COD-fraction, this reactor could not suppress the growth of filamentous bacteria. With dairy and brewery waste water, reactors with premixing tanks were used to create a more pronounced exogenous (substrate rich) phase. Using three or more premixing tanks filamentous bulking could be controlled. During the exogenous phase the floc-forming microorganisms, having a higher substrate uptake rate, can take up the largest amount of substrate and can survive better during the endogenous phase.
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