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

Brazilian Archives of Biology and Technology

Heike Hoffmann¹  Tatiana Barbosa Da Costa¹  Delmira Beatriz Wolff¹  Christoph Platzer¹  Rejane Helena Ribeiro Da Costa¹ 

[1] ,Universidade Federal de Santa Catarina Departamento da Engenharia Sanitária e Ambiental Florianópolis SC ,Brasil

关键词: Alkalinity;    activated sludge;    nitrification;    denitrification;   

DOI  :  10.1590/S1516-89132007000200018

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY-NC   
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