Effect of electrochemical treatment of oleic acid on anaerobic digestion

Detalhes bibliográficos
Autor(a) principal: Gonçalves, M. M.
Data de Publicação: 2006
Outros Autores: Bastos, E., Alves, M. M., Correia, J. P., Marques, I. P.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/1822/7124
Resumo: Electrochemical pre-treatment of oleate on anaerobic digestion was investigated using two anaerobic filters (AF and AFm) working, respectively, with increasing concentrations of electrochemically pre-treated oleate and oleate. Influents containing 25% and 50% of chemical oxygen demand (COD) of these substrates did not cause relevant alterations in either digester's performance. Comparatively, the pre-treated oleate unit (AF) showed a higher gas production but a lower COD removal than AFm (2.0 vs 1.5 m3 CH4 m−3 d−1; 76-85 vs 91-93% COD removal). The raised AFm COD removal together with the larger proportion of VSS in its effluent than in AF (5.69 vs 0.26 kg m−3) indicate that the biomass washout can be a consequence of the encapsulated solids by lipidic compounds that were not fairly degraded. Further increases of oleate in AFm feed (75 and 100% COD) led to decreases of biogas production to half and COD removal from values higher than 90% to 83-75%. The simultaneous increase of effluent VSS concentrations to 10-12 kg m−3 emphasizes the oleate negative effect. The use of pre-treated oleate as the only carbon source did not influence negatively the AF behaviour in terms of methane production. COD removal was maintained at values higher than 80% and the effluent VSS at low concentrations (0.15 kg m−3). The significantly higher methane yield achieved by AF than AFm indicates a higher accumulation of oleate than pre-treated oleate. Therefore, electrochemical process stands for a suitable pre-treatment for lipid rich effluents, allowing the application of higher organic loads keeping a higher methane yield.
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spelling Effect of electrochemical treatment of oleic acid on anaerobic digestionElectroxidation of oleic acidAnaerobic treatmentLipidsOleateAnaerobic filterelectrooxidation of oleic acidScience & TechnologyElectrochemical pre-treatment of oleate on anaerobic digestion was investigated using two anaerobic filters (AF and AFm) working, respectively, with increasing concentrations of electrochemically pre-treated oleate and oleate. Influents containing 25% and 50% of chemical oxygen demand (COD) of these substrates did not cause relevant alterations in either digester's performance. Comparatively, the pre-treated oleate unit (AF) showed a higher gas production but a lower COD removal than AFm (2.0 vs 1.5 m3 CH4 m−3 d−1; 76-85 vs 91-93% COD removal). The raised AFm COD removal together with the larger proportion of VSS in its effluent than in AF (5.69 vs 0.26 kg m−3) indicate that the biomass washout can be a consequence of the encapsulated solids by lipidic compounds that were not fairly degraded. Further increases of oleate in AFm feed (75 and 100% COD) led to decreases of biogas production to half and COD removal from values higher than 90% to 83-75%. The simultaneous increase of effluent VSS concentrations to 10-12 kg m−3 emphasizes the oleate negative effect. The use of pre-treated oleate as the only carbon source did not influence negatively the AF behaviour in terms of methane production. COD removal was maintained at values higher than 80% and the effluent VSS at low concentrations (0.15 kg m−3). The significantly higher methane yield achieved by AF than AFm indicates a higher accumulation of oleate than pre-treated oleate. Therefore, electrochemical process stands for a suitable pre-treatment for lipid rich effluents, allowing the application of higher organic loads keeping a higher methane yield.Fundação para a Ciência e a Tecnologia (FCT Eltech Systems Corporation.SelperUniversidade do MinhoGonçalves, M. M.Bastos, E.Alves, M. M.Correia, J. P.Marques, I. P.2006-112006-11-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/7124eng"Environmental Technology". ISSN 0959-3330. 27:11 (Nov. 2006) 1289-1295.0959-333010.1080/0959333270861874517203612info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:06:36Zoai:repositorium.sdum.uminho.pt:1822/7124Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T18:57:21.820522Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Effect of electrochemical treatment of oleic acid on anaerobic digestion
title Effect of electrochemical treatment of oleic acid on anaerobic digestion
spellingShingle Effect of electrochemical treatment of oleic acid on anaerobic digestion
Gonçalves, M. M.
Electroxidation of oleic acid
Anaerobic treatment
Lipids
Oleate
Anaerobic filter
electrooxidation of oleic acid
Science & Technology
title_short Effect of electrochemical treatment of oleic acid on anaerobic digestion
title_full Effect of electrochemical treatment of oleic acid on anaerobic digestion
title_fullStr Effect of electrochemical treatment of oleic acid on anaerobic digestion
title_full_unstemmed Effect of electrochemical treatment of oleic acid on anaerobic digestion
title_sort Effect of electrochemical treatment of oleic acid on anaerobic digestion
author Gonçalves, M. M.
author_facet Gonçalves, M. M.
Bastos, E.
Alves, M. M.
Correia, J. P.
Marques, I. P.
author_role author
author2 Bastos, E.
Alves, M. M.
Correia, J. P.
Marques, I. P.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Gonçalves, M. M.
Bastos, E.
Alves, M. M.
Correia, J. P.
Marques, I. P.
dc.subject.por.fl_str_mv Electroxidation of oleic acid
Anaerobic treatment
Lipids
Oleate
Anaerobic filter
electrooxidation of oleic acid
Science & Technology
topic Electroxidation of oleic acid
Anaerobic treatment
Lipids
Oleate
Anaerobic filter
electrooxidation of oleic acid
Science & Technology
description Electrochemical pre-treatment of oleate on anaerobic digestion was investigated using two anaerobic filters (AF and AFm) working, respectively, with increasing concentrations of electrochemically pre-treated oleate and oleate. Influents containing 25% and 50% of chemical oxygen demand (COD) of these substrates did not cause relevant alterations in either digester's performance. Comparatively, the pre-treated oleate unit (AF) showed a higher gas production but a lower COD removal than AFm (2.0 vs 1.5 m3 CH4 m−3 d−1; 76-85 vs 91-93% COD removal). The raised AFm COD removal together with the larger proportion of VSS in its effluent than in AF (5.69 vs 0.26 kg m−3) indicate that the biomass washout can be a consequence of the encapsulated solids by lipidic compounds that were not fairly degraded. Further increases of oleate in AFm feed (75 and 100% COD) led to decreases of biogas production to half and COD removal from values higher than 90% to 83-75%. The simultaneous increase of effluent VSS concentrations to 10-12 kg m−3 emphasizes the oleate negative effect. The use of pre-treated oleate as the only carbon source did not influence negatively the AF behaviour in terms of methane production. COD removal was maintained at values higher than 80% and the effluent VSS at low concentrations (0.15 kg m−3). The significantly higher methane yield achieved by AF than AFm indicates a higher accumulation of oleate than pre-treated oleate. Therefore, electrochemical process stands for a suitable pre-treatment for lipid rich effluents, allowing the application of higher organic loads keeping a higher methane yield.
publishDate 2006
dc.date.none.fl_str_mv 2006-11
2006-11-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/1822/7124
url http://hdl.handle.net/1822/7124
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv "Environmental Technology". ISSN 0959-3330. 27:11 (Nov. 2006) 1289-1295.
0959-3330
10.1080/09593332708618745
17203612
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Selper
publisher.none.fl_str_mv Selper
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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