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

Detalhes bibliográficos
Autor(a) principal: Hoffmann,Heike
Data de Publicação: 2007
Outros Autores: Costa,Tatiana Barbosa da, Wolff,Delmira Beatriz, Platzer,Christoph, Costa,Rejane Helena Ribeiro da
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Brazilian Archives of Biology and Technology
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000200018
Resumo: 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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spelling The potential of denitrification for the stabilization of activated sludge processes affected by low alkalinity problemsAlkalinityactivated sludgenitrificationdenitrificationIn 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.Instituto de Tecnologia do Paraná - Tecpar2007-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000200018Brazilian Archives of Biology and Technology v.50 n.2 2007reponame:Brazilian Archives of Biology and Technologyinstname:Instituto de Tecnologia do Paraná (Tecpar)instacron:TECPAR10.1590/S1516-89132007000200018info:eu-repo/semantics/openAccessHoffmann,HeikeCosta,Tatiana Barbosa daWolff,Delmira BeatrizPlatzer,ChristophCosta,Rejane Helena Ribeiro daeng2007-06-12T00:00:00Zoai:scielo:S1516-89132007000200018Revistahttps://www.scielo.br/j/babt/https://old.scielo.br/oai/scielo-oai.phpbabt@tecpar.br||babt@tecpar.br1678-43241516-8913opendoar:2007-06-12T00:00Brazilian Archives of Biology and Technology - Instituto de Tecnologia do Paraná (Tecpar)false
dc.title.none.fl_str_mv The potential of denitrification for the stabilization of activated sludge processes affected by low alkalinity problems
title The potential of denitrification for the stabilization of activated sludge processes affected by low alkalinity problems
spellingShingle The potential of denitrification for the stabilization of activated sludge processes affected by low alkalinity problems
Hoffmann,Heike
Alkalinity
activated sludge
nitrification
denitrification
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 The potential of denitrification for the stabilization of activated sludge processes affected by low alkalinity problems
author Hoffmann,Heike
author_facet Hoffmann,Heike
Costa,Tatiana Barbosa da
Wolff,Delmira Beatriz
Platzer,Christoph
Costa,Rejane Helena Ribeiro da
author_role author
author2 Costa,Tatiana Barbosa da
Wolff,Delmira Beatriz
Platzer,Christoph
Costa,Rejane Helena Ribeiro da
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Hoffmann,Heike
Costa,Tatiana Barbosa da
Wolff,Delmira Beatriz
Platzer,Christoph
Costa,Rejane Helena Ribeiro da
dc.subject.por.fl_str_mv Alkalinity
activated sludge
nitrification
denitrification
topic Alkalinity
activated sludge
nitrification
denitrification
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.
publishDate 2007
dc.date.none.fl_str_mv 2007-03-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000200018
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000200018
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1516-89132007000200018
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Instituto de Tecnologia do Paraná - Tecpar
publisher.none.fl_str_mv Instituto de Tecnologia do Paraná - Tecpar
dc.source.none.fl_str_mv Brazilian Archives of Biology and Technology v.50 n.2 2007
reponame:Brazilian Archives of Biology and Technology
instname:Instituto de Tecnologia do Paraná (Tecpar)
instacron:TECPAR
instname_str Instituto de Tecnologia do Paraná (Tecpar)
instacron_str TECPAR
institution TECPAR
reponame_str Brazilian Archives of Biology and Technology
collection Brazilian Archives of Biology and Technology
repository.name.fl_str_mv Brazilian Archives of Biology and Technology - Instituto de Tecnologia do Paraná (Tecpar)
repository.mail.fl_str_mv babt@tecpar.br||babt@tecpar.br
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