Effect of ultrasound, low-temperature thermal and alkali pre-treatments on waste activated sludge rheology, hygienization and methane potential

Waste activated sludge is slower to biodegrade under anaerobic conditions than is primary sludge due to the glycan strands present in microbial cell walls. The use of pre-treatments may help to disrupt cell membranes and improve waste activated sludge biodegradability. In the present study, the effe...

Descripción completa

Detalles Bibliográficos
Autores: Ruiz Hernando, María, Martín Díaz, Julia, Labanda, Jordi, Mata Álvarez, Joan, Llorens Llacuna, Joan, Lucena Gutiérrez, Francisco, Astals Garcia, Sergi
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2014
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/127752
Acceso en línea:https://hdl.handle.net/2445/127752
Access Level:acceso abierto
Palabra clave:Digestió anaeròbia
Reologia
Llots de depuradora
Anaerobic digestion
Rheology
Sewage sludge
id ES_a09b4e01758291097e1f2eb5403d7b0f
oai_identifier_str oai:diposit.ub.edu:2445/127752
network_acronym_str ES
network_name_str España
repository_id_str
spelling Effect of ultrasound, low-temperature thermal and alkali pre-treatments on waste activated sludge rheology, hygienization and methane potentialRuiz Hernando, MaríaMartín Díaz, JuliaLabanda, JordiMata Álvarez, JoanLlorens Llacuna, JoanLucena Gutiérrez, FranciscoAstals Garcia, SergiDigestió anaeròbiaReologiaLlots de depuradoraAnaerobic digestionRheologySewage sludgeWaste activated sludge is slower to biodegrade under anaerobic conditions than is primary sludge due to the glycan strands present in microbial cell walls. The use of pre-treatments may help to disrupt cell membranes and improve waste activated sludge biodegradability. In the present study, the effect of ultrasound, low-temperature thermal and alkali pre-treatments on the rheology, hygienization and biodegradability of waste activated sludge was evaluated. The optimum condition of each pre-treatment was selected based on rheological criteria (reduction of steady state viscosity) and hygienization levels (reduction of Escherichia coli, somatic coliphages and spores of sulfite-reducing clostridia). The three pre-treatments were able to reduce the viscosity of the sludge, and this reduction was greater with increasing treatment intensity. However, only the alkali and thermal conditioning allowed the hygienization of the sludge, whereas the ultrasonication did not exhibit any notorious effect on microbial indicators populations. The selected optimum conditions were as follows: 27,000 kJ/kg TS for the ultrasound, 80 °C during 15 min for the thermal and 157 g NaOH/kg TS for the alkali. Afterward, the specific methane production was evaluated through biomethane potential tests at the specified optimum conditions. The alkali pre-treatment exhibited the greatest methane production increase (34%) followed by the ultrasonication (13%), whereas the thermal pre-treatment presented a methane potential similar to the untreated sludge. Finally, an assessment of the different treatment scenarios was conducted considering the results together with an energy balance, which revealed that the ultrasound and alkali treatments entailed higher costs.Elsevier Ltd2014info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/2445/127752Articles publicats en revistes (Enginyeria Química i Química Analítica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésVersió postprint del document publicat a: https://doi.org/10.1016/j.watres.2014.05.012Water Research, 2014, vol. 61, p. 119-129https://doi.org/10.1016/j.watres.2014.05.012(c) Elsevier Ltd, 2014info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1277522026-05-27T06:46:51Z
dc.title.none.fl_str_mv Effect of ultrasound, low-temperature thermal and alkali pre-treatments on waste activated sludge rheology, hygienization and methane potential
title Effect of ultrasound, low-temperature thermal and alkali pre-treatments on waste activated sludge rheology, hygienization and methane potential
spellingShingle Effect of ultrasound, low-temperature thermal and alkali pre-treatments on waste activated sludge rheology, hygienization and methane potential
Ruiz Hernando, María
Digestió anaeròbia
Reologia
Llots de depuradora
Anaerobic digestion
Rheology
Sewage sludge
title_short Effect of ultrasound, low-temperature thermal and alkali pre-treatments on waste activated sludge rheology, hygienization and methane potential
title_full Effect of ultrasound, low-temperature thermal and alkali pre-treatments on waste activated sludge rheology, hygienization and methane potential
title_fullStr Effect of ultrasound, low-temperature thermal and alkali pre-treatments on waste activated sludge rheology, hygienization and methane potential
title_full_unstemmed Effect of ultrasound, low-temperature thermal and alkali pre-treatments on waste activated sludge rheology, hygienization and methane potential
title_sort Effect of ultrasound, low-temperature thermal and alkali pre-treatments on waste activated sludge rheology, hygienization and methane potential
dc.creator.none.fl_str_mv Ruiz Hernando, María
Martín Díaz, Julia
Labanda, Jordi
Mata Álvarez, Joan
Llorens Llacuna, Joan
Lucena Gutiérrez, Francisco
Astals Garcia, Sergi
author Ruiz Hernando, María
author_facet Ruiz Hernando, María
Martín Díaz, Julia
Labanda, Jordi
Mata Álvarez, Joan
Llorens Llacuna, Joan
Lucena Gutiérrez, Francisco
Astals Garcia, Sergi
author_role author
author2 Martín Díaz, Julia
Labanda, Jordi
Mata Álvarez, Joan
Llorens Llacuna, Joan
Lucena Gutiérrez, Francisco
Astals Garcia, Sergi
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Digestió anaeròbia
Reologia
Llots de depuradora
Anaerobic digestion
Rheology
Sewage sludge
topic Digestió anaeròbia
Reologia
Llots de depuradora
Anaerobic digestion
Rheology
Sewage sludge
description Waste activated sludge is slower to biodegrade under anaerobic conditions than is primary sludge due to the glycan strands present in microbial cell walls. The use of pre-treatments may help to disrupt cell membranes and improve waste activated sludge biodegradability. In the present study, the effect of ultrasound, low-temperature thermal and alkali pre-treatments on the rheology, hygienization and biodegradability of waste activated sludge was evaluated. The optimum condition of each pre-treatment was selected based on rheological criteria (reduction of steady state viscosity) and hygienization levels (reduction of Escherichia coli, somatic coliphages and spores of sulfite-reducing clostridia). The three pre-treatments were able to reduce the viscosity of the sludge, and this reduction was greater with increasing treatment intensity. However, only the alkali and thermal conditioning allowed the hygienization of the sludge, whereas the ultrasonication did not exhibit any notorious effect on microbial indicators populations. The selected optimum conditions were as follows: 27,000 kJ/kg TS for the ultrasound, 80 °C during 15 min for the thermal and 157 g NaOH/kg TS for the alkali. Afterward, the specific methane production was evaluated through biomethane potential tests at the specified optimum conditions. The alkali pre-treatment exhibited the greatest methane production increase (34%) followed by the ultrasonication (13%), whereas the thermal pre-treatment presented a methane potential similar to the untreated sludge. Finally, an assessment of the different treatment scenarios was conducted considering the results together with an energy balance, which revealed that the ultrasound and alkali treatments entailed higher costs.
publishDate 2014
dc.date.none.fl_str_mv 2014
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/2445/127752
url https://hdl.handle.net/2445/127752
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1016/j.watres.2014.05.012
Water Research, 2014, vol. 61, p. 119-129
https://doi.org/10.1016/j.watres.2014.05.012
dc.rights.none.fl_str_mv (c) Elsevier Ltd, 2014
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Elsevier Ltd, 2014
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier Ltd
publisher.none.fl_str_mv Elsevier Ltd
dc.source.none.fl_str_mv Articles publicats en revistes (Enginyeria Química i Química Analítica)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869415042945908736
score 15,300724

Similares en LA Referencia