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https://hdl.handle.net/1822/7124
Título: | Effect of electrochemical treatment of oleic acid on anaerobic digestion |
Autor(es): | Gonçalves, M. M. Bastos, E. Alves, M. M. Correia, J. P. Marques, I. P. |
Palavras-chave: | Electroxidation of oleic acid Anaerobic treatment Lipids Oleate Anaerobic filter electrooxidation of oleic acid |
Data: | Nov-2006 |
Editora: | Selper |
Revista: | Environmental Technology |
Citação: | "Environmental Technology". ISSN 0959-3330. 27:11 (Nov. 2006) 1289-1295. |
Resumo(s): | 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. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/7124 |
DOI: | 10.1080/09593332708618745 |
ISSN: | 0959-3330 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series |