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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Instituto de Tecnologia do Paraná - Tecpar
2007
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oai:scielo:S1516-891320070002000182007-06-12The potential of denitrification for the stabilization of activated sludge processes affected by low alkalinity problemsHoffmann,HeikeCosta,Tatiana Barbosa daWolff,Delmira BeatrizPlatzer,ChristophCosta,Rejane Helena Ribeiro da Alkalinity activated sludge nitrification denitrification 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.info:eu-repo/semantics/openAccessInstituto de Tecnologia do Paraná - TecparBrazilian Archives of Biology and Technology v.50 n.2 20072007-03-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000200018en10.1590/S1516-89132007000200018 |
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Hoffmann,Heike Costa,Tatiana Barbosa da Wolff,Delmira Beatriz Platzer,Christoph Costa,Rejane Helena Ribeiro da |
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Hoffmann,Heike Costa,Tatiana Barbosa da Wolff,Delmira Beatriz Platzer,Christoph Costa,Rejane Helena Ribeiro da The potential of denitrification for the stabilization of activated sludge processes affected by low alkalinity problems |
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Hoffmann,Heike Costa,Tatiana Barbosa da Wolff,Delmira Beatriz Platzer,Christoph Costa,Rejane Helena Ribeiro da |
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Hoffmann,Heike |
| title |
The potential of denitrification for the stabilization of activated sludge processes affected by low alkalinity problems |
| title_short |
The potential of denitrification for the stabilization of activated sludge processes affected by low alkalinity problems |
| title_full |
The potential of denitrification for the stabilization of activated sludge processes affected by low alkalinity problems |
| title_fullStr |
The potential of denitrification for the stabilization of activated sludge processes affected by low alkalinity problems |
| title_full_unstemmed |
The potential of denitrification for the stabilization of activated sludge processes affected by low alkalinity problems |
| title_sort |
potential of denitrification for the stabilization of activated sludge processes affected by low alkalinity problems |
| description |
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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Instituto de Tecnologia do Paraná - Tecpar |
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2007 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000200018 |
| work_keys_str_mv |
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