The potential of denitrification for the stabilization of activated sludge processes affected by low alkalinity problems

In this study, the problems provoked by nitrification of wastewater with low alkalinity were analyzed in a pilot sequencing batch activated sludge reactor (SBR). Decrease in pH resulted in disappearence of protozoa. De-flocculation of the activated sludge floc started below pH 6.5, resulting in enhanced effluent turbidity and loss of bacteria. Nitrification efficiency was affected below pH 6.2. The denitrification activity was not sufficient to keep up the pH, due to a low C/N ratio of the wastewater. Based on alkalinity and ammonia concentration of the wastewater and the necessary denitrification rate to prevent operational problems, was developed a prognostic diagram. The applicability of this diagram was tested for the SBR with excellent results. The diagram could be applied to optimize the operation of wastewater treatment plants affected by problems with low alkalinity wastewater.

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Bibliographic Details
Main Authors: Hoffmann,Heike, Costa,Tatiana Barbosa da, Wolff,Delmira Beatriz, Platzer,Christoph, Costa,Rejane Helena Ribeiro da
Format: Digital revista
Language:English
Published: Instituto de Tecnologia do Paraná - Tecpar 2007
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000200018
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