Evaluating biochemical methane production from brewer’s spent yeast |
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Authors: | Ornella Sosa-Hernández Prathap Parameswaran Gibrán Sidney Alemán-Nava César I Torres Roberto Parra-Saldívar |
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Institution: | 1.Escuela de Ingeniería y Ciencias,?Tecnologico de Monterrey, Campus Monterrey,Monterrey,Mexico;2.Swette Center for Environmental Biotechnology, Biodesign Institute,Arizona State University,Tempe,USA;3.School for Engineering of Matter, Transport and Energy,Arizona State University,Tempe,USA;4.Department of Civil Engineering,Kansas State University,Manhattan,USA |
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Abstract: | Anaerobic digestion treatment of brewer’s spent yeast (SY) is a viable option for bioenergy capture. The biochemical methane potential (BMP) assay was performed with three different samples (SY1, SY2, and SY3) and SY1 dilutions (75, 50, and 25 % on a v/v basis). Gompertz-equation parameters denoted slow degradability of SY1 with methane production rates of 14.59–4.63 mL/day and lag phases of 10.72–19.7 days. Performance and kinetic parameters were obtained with the Gompertz equation and the first-order hydrolysis model with SY2 and SY3 diluted 25 % and SY1 50 %. A SY2 25 % gave a 17 % of TCOD conversion to methane as well as shorter lag phase (<1 day). Average estimated hydrolysis constant for SY was 0.0141 (±0.003) day?1, and SY2 25 % was more appropriate for faster methane production. Methane capture and biogas composition were dependent upon the SY source, and co-digestion (or dilution) can be advantageous. |
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