Author, as appears in the article.: Bengoa, C. Font, J. Fortuny, A. Stüber, F. Fabregat, A. Earle, M.J. Plechkova, N.V. Olkiewicz, M.
Department: Enginyeria Química
URV's Author/s: OLKIEWICZ, MAGDALENA Plechkova, N.V. Earle, M.J. FABREGAT LLANGOSTERA, AZAEL STÜBER, FRANK ERICH FORTUNY SANROMÀ, AGUSTÍ FONT CAPAFONS, JOSÉ BENGOA, CHRISTOPHE JOSÉ
Keywords: Cellulosic material ionic liquid Primary sludge Biodiesel Lipid extraction
Abstract: This study proposes a novel method to extract lipids from wet primary sludge for biodiesel production using ionic liquids. Tetrakis(hydroxymethyl)phosphonium chloride and widely used 1-butyl-3- methylimidazolium methyl sulfate were evaluated to extract lipids from raw and dried sludge (96% and 2%, wt. water content, respectively) and compared to the conventional Soxhlet method using organic solvents. Both these ionic liquids showed suitability for lipid extraction from raw sludge, giving even better results than expected from dried sludge. The [C4mim][MeSO4] ionic liquid reached 18.5% and 26.9% of lipids, 14.1% and 18.4% of biodiesel from dried and raw sludge, respectively. The [P(CH2OH)4]Cl ionic liquid gained 23.4% and 27.6% of lipids, 17.0% and 19.8% of biodiesel from dried and raw sludge respectively, reaching comparable results to the conventional Soxhlet method (27.2% of lipids, 19.4% of biodiesel).
Therefore, the proposed ionic liquid process is efficient in lipid extraction directly from wet primary sludge, eliminating the expensive step of sludge drying and the use of volatile organic solvents. Under the optimised extraction conditions using [P(CH2OH)4]Cl ionic liquid and raw sludge (1:5 sludge (g/ TS):IL (cm3) ratio, 100 C and 3 h), the obtained yield of lipids and biodiesel amounted to 25.7% and 21.1%, respectively. Additionally, lipid extraction using [P(CH2OH)4]Cl ionic liquid also precipitates cellulosic material, which allows for direct and easy cellulose-based co-product recovery, giving high additional value to the process. Consequently, the economic and environmental aspects of biodiesel production from sewage sludge could be improved.
Research group: Enginyeria de la Reacció Química i Intensificació de Processos
Thematic Areas: Chemical engineering Ingeniería química Enginyeria química
licence for use: https://creativecommons.org/licenses/by/3.0/es/
ISSN: 1383-5866
Author identifier: 0000-0001-9160-5010 0000-0002-4007-7905 0000-0002-2350-8654 0000-0001-9424-1400 0000-0002-5525-5401 n/a 0000-0003-2254-9603 0000-0002-9849-6715
Record's date: 2015-09-15
Last page: 125
Journal volume: 153
Papper version: info:eu-repo/semantics/acceptedVersion
Link to the original source: https://www.sciencedirect.com/science/article/pii/S1383586615301738?via%3Dihub
Article's DOI: 10.1016/j.seppur.2015.08.038
Entity: Universitat Rovira i Virgili
Journal publication year: 2015
First page: 118
Publication Type: Article Artículo Article
Repositori URV