Co-digestion of sewage sludge with glycerol to boost biogas production |
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| Authors: | MS Fountoulakis I Petousi T Manios |
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| Institution: | 1. Civil and Environmental Engineering, University of Alberta, 9211-116 Street NW, Edmonton, AB, T6G 1H9, Canada;2. Environmental Science and Engineering, Tsinghua University, Beijing 100084, China;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 Chemical Engineering, University of Barcelona, C/Martí i Franquès, No. 1, 6th Floor, 08028 Barcelona, Spain;2. Advanced Water Management Centre, The University of Queensland, St Lucia, QLD 4072, Australia;1. Strategic Water Infrastructure Laboratory, School of Civil Mining and Environmental Engineering, University of Wollongong, Wollongong, NSW 2522, Australia;2. Sydney Water, Parramatta, NSW 2124, Australia;1. Technical University of Lodz, Institute of Fermentation Technology and Microbiology, Poland;2. The University of Kansas, Department of Chemical and Petroleum Engineering, United States |
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| Abstract: | The feasibility of adding crude glycerol from the biodiesel industry to the anaerobic digesters treating sewage sludge in wastewater treatment plants was studied in both batch and continuous experiments at 35 °C. Glycerol addition can boost biogas yields, if it does not exceed a limiting 1% (v/v) concentration in the feed. Any further increase of glycerol causes a high imbalance in the anaerobic digestion process. The reactor treating the sewage sludge produced 1106 ± 36 ml CH4/d before the addition of glycerol and 2353 ± 94 ml CH4/d after the addition of glycerol (1% v/v in the feed). The extra glycerol-COD added to the feed did not have a negative effect on reactor performance, but seemed to increase the active biomass (volatile solids) concentration in the system. Batch kinetic experiments showed that the maximum specific utilization rate (μmax) and the saturation constant (KS) of glycerol were 0.149 ± 0.015 h?1 and 0.276 ± 0.095 g/l, respectively. Comparing the estimated values with the kinetics constants for propionate reported in the literature, it can be concluded that glycerol uptake is not the rate-limiting step during the process. |
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