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Evaluation of different sludges from WWTP as a potential source for biodiesel production
Olkiewicz, Magdalena; Fortuny Sanromá, Agustín; Stüber, Frank Erich; Fabregat Llangotera, Azael; Font Capafons, Josep; Bengoa, Christophe José
Universitat Politècnica de Catalunya. Departament d'Enginyeria Química
Biodiesel expansion is currently limited due to high raw material costs for its produc tion. The potential of using sludge from municipal wastewater treatment plants as an alternative lipid feedstock for biodiesel production was investigated. Experiments were conducted to evaluate the suit ability of four different types of wastewater sludges for biodiesel production. Lipids were extracted from primary, secondary, blended and stabilized sludge in a Soxhlet extractor, using hexane as a solvent. Finally, the lipids were converted by acid catalysis transesterification into their corresponding fatty acid methyl esters (FAMEs) - biodiesel . Results indicated that among four sludge tested, primary sludge achieved the greatest lipids and biodiesel yields. Th e amount of extracted lipids for primary sludge was 25.3% compared to 21.9%, 10.1% and 9.1% (dry wt) for blended, stabilized and secondary sludge, respectively. The FAMEs yields obtained in this study were 13.9%, 10.9%, 2.9% and 1% (dry wt) for primary, blended, secondary and stabilized sludge, respectively. The estimation of annual biodiesel production based on the sludge generated in WWTP of Reus was evaluated, showing that primary sludge consists of 87% of the total biodiesel among the wastewater sludges. Gas chromatography analysis of th e FAMEs revealed a similar fatty acids composition for all sludge tested with a predominance of palmitic acid, stearic acid, oleic acid and linoleic acid. Comparison of sludge fatty acid profile with common biodiesel feedstocks showed their suitability for the production of biodiesel.
Peer Reviewed
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament de l'aigua
Àrees temàtiques de la UPC::Energies::Recursos energètics renovables::Biocombustibles
Biodiesel fuels--Research
Sewage sludge fuel
Waste products as fuel
Fatty acids
Lipids
Llots de depuradora -- Reutilització de residus
Aigües residuals -- Reutilització
Aigües residuals -- Plantes de tractament -- Residus -- Aprofitament
Biodièsels
Lípids
info:eu-repo/semantics/publishedVersion
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