Feasibility study of biogas upgrading coupled with nutrient removal from anaerobic effluents using microalgae-based processes |
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| Authors: | E Posadas D Szpak F Lombó A Domínguez I Díaz S Blanco P A García-Encina R Muñoz |
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| Institution: | 1.Department of Chemical Engineering and Environmental Technology,University of Valladolid,Valladolid,Spain;2.Departamento de Biología Funcional, IUOPA Research Unit “Biotechnology and Experimental Therapy based on Nutraceuticals- BITTEN”. área de Microbiología. Facultad de Medicina,Universidad de Oviedo,Oviedo,Spain;3.Biogas Fuel Cell S.A.,Gijón,Spain;4.Department of Biodiversity and Environmental Management,University of León,León,Spain;5.The Institute of the Environment,Leon,Spain |
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| Abstract: | The present research was conducted to simultaneously optimize biogas upgrading and carbon and nutrient removal from centrates in a 180-L high-rate algal pond interconnected to an external CO2 absorption unit. Different biogas and centrate supply strategies were assessed to increase biomass lipid content. Results showed 99 % CO2 removal efficiencies from simulated biogas at liquid recirculation rates in the absorption column of 9.9 m3 m?2 h?1, concomitant with nitrogen and phosphorus removal efficiencies of 100 and 82 %, respectively, using a 1:70 diluted centrate at a hydraulic retention time of 7 days. The lipid content of the harvested algal–bacterial biomass remained low (2.9–11.2 %) regardless of the operational conditions, with no particular trend over time. The good settling characteristics of the algal–bacterial flocs resulted in harvesting efficiencies over 95 %, which represents a cost-effective alternative for algal biomass reutilization compared to conventional physical–chemical techniques. Finally, high microalgae biodiversity was found regardless of the operational conditions. |
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