Biogas production from sewage sludge and microalgae co-digestion under mesophilic and thermophilic conditions |
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| Affiliation: | 1. Departament d''Enginyeria Química, Universitat Rovira i Virgili, Av. Països Catalans 26, 43007, Tarragona, Spain;2. IRTA Aquatic Ecosystems, Ctra. Poble Nou Km 5.5, 43540, Sant Carles de la Ràpita, Spain;1. Department of Physics, Faculty of Science, Kunming University of Science and Technology, Kunming 650500, China;2. Center of Student Community Education and Management, Kunming University of Science and Technology, Kunming 650500, China;1. Faculty of Sciences, Universidad Autónoma de Baja California, Km. 103 Carretera Tijuana-Ensenada, 22860 Ensenada, B.C., Mexico;2. Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands;3. Faculty of Mathematics and Natural Sciences, ITM, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands;1. UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, PO Box 392, Pretoria, South Africa;2. Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Old Faure road, 7129 Somerset West, South Africa;3. Deptartment of Physics, University of Western Cape, Private Bag X 17, Bellville 7535, South Africa;4. Physics Department, AOMRG, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia;1. Department of Chemistry and Bioengineering, Tampere University of Technology, Tampere, Finland;2. Department of Signal Processing, Tampere University of Technology, Tampere, Finland |
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| Abstract: | Isochrysis galbana and Selenastrum capricornutum, marine and freshwater microalgae species respectively, were co-digested with sewage sludge under mesophilic and thermophilic conditions. The substrates and the temperatures significantly influenced biogas production.Under mesophilic conditions, the sewage sludge digestion produced 451 ± 12 mLBiogas/gSV. Furthermore, all digesters were fed with I. galbana, or mixed with sludge, resulting in an average of 440 ± 25 mLBiogas/gSV. On the contrary, S. capricornutum produced 271 ± 6 mLBiogas/gSV and in the mixtures containing sludge produced intermediate values between sludge and microalgae production.Under thermophilic conditions, the sewage sludge digestion achieved yet the highest biogas yield, 566 ± 5 mLBiogas/gSV. During co-digestion, biogas production decreased when the microalgae content increased, and for I. galbana and for S. capricornutum it reached minimum values, 261 ± 11 and 185 ± 7 mLBiogas/gSV, respectively. However, no evidence of inhibition was found and the low yields were attributed to microalgae species characteristics.The methane content in biogas showed similar values, independently from the digested substrate, although this increased by approximately 5% under thermophilic condition. |
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| Keywords: | Biogas Biomethane potential (BMP) Co-digestion Sewage sludge |
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