Bulking can be said to have ...

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Bulking can be said to have occurred in activated sludge plants when the sludge does not settle easily and has an excessive volume. high F:M ratio requires a high DO concentration for effective treatment of the BOD load. However at low DO concentrations and at high F:M ratios excessive filamentous growth may occur leading to bulking. Bulking due to low DO can occur in a short space of time. A correction mechanism could be to increase the DO in the aeration tank.