An Evaluation of Maintaining Elevated Oxygen Concentration in Activated Sludge Systems

Elliott, A. and Mahmood, T., FPInnovations , Canada


The potential of reducing secondary sludge production in activated sludge treatment systems by elevating residual dissolved oxygen (DO) was investigated for a pulp and paper mills. Approximately 10% less sludge was produced by elevating the aeration basin DO concentration from 1 mg/L to 8 mg/L for the three mill effluent types tested. High DO in the aeration basins improved system performance, in terms of COD removal, sludge settling and dewatering properties. However, aeration requirements were at least four times higher for the high DO system as compared to the conventional system operating at a residual DO of 1 mg/L.

Activated sludge, pulp and paper, dissolved oxygen, sludge, reduction

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