Settling velocity distribution of microalgal biomass from urban wastewater treatment high rate algal ponds

The aim of this study was to evaluate the settling velocity distribution of microalgal biomass with and without flocculant (Tanfloc SG). Microalgal biomass was obtained from two experimental wastewater treatment high rate algal ponds (HRAPs) operated with 4 and 8 days of hydraulic retention time. Tw...

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Autores: Gutiérrez Martínez, Raquel, Ferrer Martí, Ivet|||0000-0002-4568-4843, Uggetti, Enrica|||0000-0001-6919-485X, Arnabat, Carme, Salvado, Humbert, García Serrano, Joan|||0000-0003-1258-8174
Formato: artículo
Fecha de publicación:2016
País:España
Recursos:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/88583
Acesso em linha:https://hdl.handle.net/2117/88583
https://dx.doi.org/10.1016/j.algal.2016.03.037
Access Level:acceso abierto
Palavra-chave:Microalgae--Biotechnology
Coagulation-flocculation
High rate algal pond
Microalgae
Biomass
Sedimentation
Wastewater
Microalgues -- Biotecnologia
Àrees temàtiques de la UPC::Enginyeria civil::Enginyeria hidràulica, marítima i sanitària::Enginyeria sanitària
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament de l'aigua
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network_acronym_str ES
network_name_str España
repository_id_str
spelling Settling velocity distribution of microalgal biomass from urban wastewater treatment high rate algal pondsGutiérrez Martínez, RaquelFerrer Martí, Ivet|||0000-0002-4568-4843Uggetti, Enrica|||0000-0001-6919-485XArnabat, CarmeSalvado, HumbertGarcía Serrano, Joan|||0000-0003-1258-8174Microalgae--BiotechnologyCoagulation-flocculationHigh rate algal pondMicroalgaeBiomassSedimentationWastewaterMicroalgues -- BiotecnologiaÀrees temàtiques de la UPC::Enginyeria civil::Enginyeria hidràulica, marítima i sanitària::Enginyeria sanitàriaÀrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament de l'aiguaThe aim of this study was to evaluate the settling velocity distribution of microalgal biomass with and without flocculant (Tanfloc SG). Microalgal biomass was obtained from two experimental wastewater treatment high rate algal ponds (HRAPs) operated with 4 and 8 days of hydraulic retention time. Two sets of dynamic sedimentation tests were carried out using a water elutriation apparatus. In the first set, most of the biomass of the 8 days-HRAP (63%) had settling velocities between 16.5 and 4 m/h, while most of the biomass of the 4 days-HRAP (65%) had settling velocities between 16.5 and 1 m/h. In the second set, most of the biomass from both HRAPs (60% from the 8 days-HRAP and 80% from the 4 days-HRAP) had settling velocities between 6.5 and 0.4 m/h. In this second set, settling velocities of <0.4 m/h were reached by 20% and 40% of the biomass from 4 days-HRAP and 8 days-HRAP, respectively. The addition of flocculant at optimal doses ranging from 20 to 40 mg/L had impressive effects on the settling velocity distribution in this second set. 70% and 84% of biomass reached velocities of >6.5 m/h, compared to 10% and 14% of microalgal biomass without flocculant for the 8 days-and 4 days-HRAPs, respectively. With flocculant, a very small amount of biomass (3% for the 4 days-HRAP and 8% for the 8 days-HRAP) had settling velocities of <0.4 m/h. Microscopic examination of samples from sedimentation tests showed how an important amount of microalgae settled in the system. Indeed, <1500 microalgae individuals/mL were found in all outlet samples from the elutriation apparatus (inlet samples of >10(5) microalgae individuals/mL). According to our results, a settler designed with a critical settling velocity of 1m/h would reach biomass recoveries as high as 90-94% with flocculant compared to 77-88% without flocculant.Peer Reviewed20162016-06-0120162016-07-06journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/88583https://dx.doi.org/10.1016/j.algal.2016.03.037reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2http://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/885832026-05-27T15:37:01Z
dc.title.none.fl_str_mv Settling velocity distribution of microalgal biomass from urban wastewater treatment high rate algal ponds
title Settling velocity distribution of microalgal biomass from urban wastewater treatment high rate algal ponds
spellingShingle Settling velocity distribution of microalgal biomass from urban wastewater treatment high rate algal ponds
Gutiérrez Martínez, Raquel
Microalgae--Biotechnology
Coagulation-flocculation
High rate algal pond
Microalgae
Biomass
Sedimentation
Wastewater
Microalgues -- Biotecnologia
Àrees temàtiques de la UPC::Enginyeria civil::Enginyeria hidràulica, marítima i sanitària::Enginyeria sanitària
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament de l'aigua
title_short Settling velocity distribution of microalgal biomass from urban wastewater treatment high rate algal ponds
title_full Settling velocity distribution of microalgal biomass from urban wastewater treatment high rate algal ponds
title_fullStr Settling velocity distribution of microalgal biomass from urban wastewater treatment high rate algal ponds
title_full_unstemmed Settling velocity distribution of microalgal biomass from urban wastewater treatment high rate algal ponds
title_sort Settling velocity distribution of microalgal biomass from urban wastewater treatment high rate algal ponds
dc.creator.none.fl_str_mv Gutiérrez Martínez, Raquel
Ferrer Martí, Ivet|||0000-0002-4568-4843
Uggetti, Enrica|||0000-0001-6919-485X
Arnabat, Carme
Salvado, Humbert
García Serrano, Joan|||0000-0003-1258-8174
author Gutiérrez Martínez, Raquel
author_facet Gutiérrez Martínez, Raquel
Ferrer Martí, Ivet|||0000-0002-4568-4843
Uggetti, Enrica|||0000-0001-6919-485X
Arnabat, Carme
Salvado, Humbert
García Serrano, Joan|||0000-0003-1258-8174
author_role author
author2 Ferrer Martí, Ivet|||0000-0002-4568-4843
Uggetti, Enrica|||0000-0001-6919-485X
Arnabat, Carme
Salvado, Humbert
García Serrano, Joan|||0000-0003-1258-8174
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Microalgae--Biotechnology
Coagulation-flocculation
High rate algal pond
Microalgae
Biomass
Sedimentation
Wastewater
Microalgues -- Biotecnologia
Àrees temàtiques de la UPC::Enginyeria civil::Enginyeria hidràulica, marítima i sanitària::Enginyeria sanitària
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament de l'aigua
topic Microalgae--Biotechnology
Coagulation-flocculation
High rate algal pond
Microalgae
Biomass
Sedimentation
Wastewater
Microalgues -- Biotecnologia
Àrees temàtiques de la UPC::Enginyeria civil::Enginyeria hidràulica, marítima i sanitària::Enginyeria sanitària
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament de l'aigua
description The aim of this study was to evaluate the settling velocity distribution of microalgal biomass with and without flocculant (Tanfloc SG). Microalgal biomass was obtained from two experimental wastewater treatment high rate algal ponds (HRAPs) operated with 4 and 8 days of hydraulic retention time. Two sets of dynamic sedimentation tests were carried out using a water elutriation apparatus. In the first set, most of the biomass of the 8 days-HRAP (63%) had settling velocities between 16.5 and 4 m/h, while most of the biomass of the 4 days-HRAP (65%) had settling velocities between 16.5 and 1 m/h. In the second set, most of the biomass from both HRAPs (60% from the 8 days-HRAP and 80% from the 4 days-HRAP) had settling velocities between 6.5 and 0.4 m/h. In this second set, settling velocities of <0.4 m/h were reached by 20% and 40% of the biomass from 4 days-HRAP and 8 days-HRAP, respectively. The addition of flocculant at optimal doses ranging from 20 to 40 mg/L had impressive effects on the settling velocity distribution in this second set. 70% and 84% of biomass reached velocities of >6.5 m/h, compared to 10% and 14% of microalgal biomass without flocculant for the 8 days-and 4 days-HRAPs, respectively. With flocculant, a very small amount of biomass (3% for the 4 days-HRAP and 8% for the 8 days-HRAP) had settling velocities of <0.4 m/h. Microscopic examination of samples from sedimentation tests showed how an important amount of microalgae settled in the system. Indeed, <1500 microalgae individuals/mL were found in all outlet samples from the elutriation apparatus (inlet samples of >10(5) microalgae individuals/mL). According to our results, a settler designed with a critical settling velocity of 1m/h would reach biomass recoveries as high as 90-94% with flocculant compared to 77-88% without flocculant.
publishDate 2016
dc.date.none.fl_str_mv 2016
2016-06-01
2016
2016-07-06
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/88583
https://dx.doi.org/10.1016/j.algal.2016.03.037
url https://hdl.handle.net/2117/88583
https://dx.doi.org/10.1016/j.algal.2016.03.037
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2

http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2

http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.300719

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