Dewaterability of sewage sludge by ultrasonic, thermal and chemical treatments

Sludges resulting from wastewater treatment processes have a characteristically high water content, which complicates handling operations such as pumping, transport and disposal. To enhance the dewatering of secondary sludge, the effect of ultrasound waves, thermal treatment and chemical conditionin...

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Autores: Ruiz Hernando, María, Martinez-Elorza, Guillermo, Labanda, Jordi, Llorens Llacuna, Joan
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2013
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/46031
Acceso en línea:https://hdl.handle.net/2445/46031
Access Level:acceso abierto
Palabra clave:Llots de depuradora
Reologia
Tractament tèrmic
Ultrasons
Sewage sludge
Rheology
Heat treatment
Ultrasonics
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spelling Dewaterability of sewage sludge by ultrasonic, thermal and chemical treatmentsRuiz Hernando, MaríaMartinez-Elorza, GuillermoLabanda, JordiLlorens Llacuna, JoanLlots de depuradoraReologiaTractament tèrmicUltrasonsSewage sludgeRheologyHeat treatmentUltrasonicsSludges resulting from wastewater treatment processes have a characteristically high water content, which complicates handling operations such as pumping, transport and disposal. To enhance the dewatering of secondary sludge, the effect of ultrasound waves, thermal treatment and chemical conditioning with NaOH have been studied. Two features of treated sludges were examined: their rheological behavior and their dewaterability. The rheological tests consisted of recording shear stress when the shear rate increases and decreases continuously and linearly with time, and when it increases and decreases in steps. Steady-state viscosity and thixotropy were obtained from the rheological tests, and both decreased significantly in all cases with increased treatment intensity. Centrifugation of ultrasonicated and thermally treated sludges allowed the total solid content to be increased by approximately 16.2% and 17.6%, respectively. These dewatered sludges had a lower viscosity and thixotropy than the untreated sludge. In contrast, alkali conditioning barely allowed the sludge to be dewatered by centrifugation, despite decreasing its viscosity and thixotropy.Elsevier B.V.2013201320132013info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion36 p.application/pdfapplication/pdfhttps://hdl.handle.net/2445/46031Articles publicats en revistes (Enginyeria Química i Química Analítica)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésVersió postprint del document publicat a: http://dx.doi.org/10.1016/j.cej.2013.06.046Chemical Engineering Journal, 2013, vol. 230, p. 102-110http://dx.doi.org/10.1016/j.cej.2013.06.046(c) Elsevier B.V., 2013info:eu-repo/semantics/openAccessoai:recercat.cat:2445/460312026-05-29T05:05:01Z
dc.title.none.fl_str_mv Dewaterability of sewage sludge by ultrasonic, thermal and chemical treatments
title Dewaterability of sewage sludge by ultrasonic, thermal and chemical treatments
spellingShingle Dewaterability of sewage sludge by ultrasonic, thermal and chemical treatments
Ruiz Hernando, María
Llots de depuradora
Reologia
Tractament tèrmic
Ultrasons
Sewage sludge
Rheology
Heat treatment
Ultrasonics
title_short Dewaterability of sewage sludge by ultrasonic, thermal and chemical treatments
title_full Dewaterability of sewage sludge by ultrasonic, thermal and chemical treatments
title_fullStr Dewaterability of sewage sludge by ultrasonic, thermal and chemical treatments
title_full_unstemmed Dewaterability of sewage sludge by ultrasonic, thermal and chemical treatments
title_sort Dewaterability of sewage sludge by ultrasonic, thermal and chemical treatments
dc.creator.none.fl_str_mv Ruiz Hernando, María
Martinez-Elorza, Guillermo
Labanda, Jordi
Llorens Llacuna, Joan
author Ruiz Hernando, María
author_facet Ruiz Hernando, María
Martinez-Elorza, Guillermo
Labanda, Jordi
Llorens Llacuna, Joan
author_role author
author2 Martinez-Elorza, Guillermo
Labanda, Jordi
Llorens Llacuna, Joan
author2_role author
author
author
dc.subject.none.fl_str_mv Llots de depuradora
Reologia
Tractament tèrmic
Ultrasons
Sewage sludge
Rheology
Heat treatment
Ultrasonics
topic Llots de depuradora
Reologia
Tractament tèrmic
Ultrasons
Sewage sludge
Rheology
Heat treatment
Ultrasonics
description Sludges resulting from wastewater treatment processes have a characteristically high water content, which complicates handling operations such as pumping, transport and disposal. To enhance the dewatering of secondary sludge, the effect of ultrasound waves, thermal treatment and chemical conditioning with NaOH have been studied. Two features of treated sludges were examined: their rheological behavior and their dewaterability. The rheological tests consisted of recording shear stress when the shear rate increases and decreases continuously and linearly with time, and when it increases and decreases in steps. Steady-state viscosity and thixotropy were obtained from the rheological tests, and both decreased significantly in all cases with increased treatment intensity. Centrifugation of ultrasonicated and thermally treated sludges allowed the total solid content to be increased by approximately 16.2% and 17.6%, respectively. These dewatered sludges had a lower viscosity and thixotropy than the untreated sludge. In contrast, alkali conditioning barely allowed the sludge to be dewatered by centrifugation, despite decreasing its viscosity and thixotropy.
publishDate 2013
dc.date.none.fl_str_mv 2013
2013
2013
2013
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/46031
url https://hdl.handle.net/2445/46031
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: http://dx.doi.org/10.1016/j.cej.2013.06.046
Chemical Engineering Journal, 2013, vol. 230, p. 102-110
http://dx.doi.org/10.1016/j.cej.2013.06.046
dc.rights.none.fl_str_mv (c) Elsevier B.V., 2013
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Elsevier B.V., 2013
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 36 p.
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
dc.source.none.fl_str_mv Articles publicats en revistes (Enginyeria Química i Química Analítica)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.81155

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