The inoculum to substrate (I:S) ratio is a crucial operating parameter during the start-up period of anaerobic digestion (AD) processes and this ratio shows high differentiation with respect to substrate composition. While spent coffee grounds (SCG) have started to gain attraction in AD as a co-substrate due to their vast production and promising methane potential, there is still not enough information on the operative environment of SCG-based biogas reactors. This study investigated the optimal I:S ratio during anaerobic co-digestion of SCG and cow manure. Biochemical methane potential tests were conducted at mesophilic conditions and the influence of I:S ratio on methane production and digestion stability was evaluated at a wide range of I:S ratios from 0.5:1 to 4:1 (volatile solids (VS) basis). Methane yields increased gradually starting from the I:S ratio of 0.5:1 up to 3:1 and the highest methane yield (225 mlCH(4) gVS(-1)) was achieved at the I:S ratio of 3:1. Comparatively lower methane yields were obtained at the ratios of 3.5:1 and 4:1. Instable AD conditions were established at the lowest I:S ratio examined (0.5:1), which caused volatile fatty acid (VFA) accumulation. The results highlighted that anaerobic co-digestion of SCG and cow manure is a promising approach, while the I:S ratio should be well-maintained due to the high potential risk of rapid and/or excess VFA production of these feedstocks.
机构:
Univ Autonoma Queretaro, Programa Alimentos Ctr Republ PROPAC, Sch Chem, Res & Grad Studies Food Sci, Queretaro 76010, Qro, MexicoUniv Autonoma Queretaro, Programa Alimentos Ctr Republ PROPAC, Sch Chem, Res & Grad Studies Food Sci, Queretaro 76010, Qro, Mexico
Campos-Vega, Rocio
;
Loarca-Pina, Guadalupe
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Univ Autonoma Queretaro, Programa Alimentos Ctr Republ PROPAC, Sch Chem, Res & Grad Studies Food Sci, Queretaro 76010, Qro, MexicoUniv Autonoma Queretaro, Programa Alimentos Ctr Republ PROPAC, Sch Chem, Res & Grad Studies Food Sci, Queretaro 76010, Qro, Mexico
Loarca-Pina, Guadalupe
;
Vergara-Castaneda, Hayde A.
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Nucitec SA CV, Colonia Penuelas, Queretaro, MexicoUniv Autonoma Queretaro, Programa Alimentos Ctr Republ PROPAC, Sch Chem, Res & Grad Studies Food Sci, Queretaro 76010, Qro, Mexico
Vergara-Castaneda, Hayde A.
;
Oomah, B. Dave
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h-index: 0
机构:
Agr & Agri Food Canada, Natl Bioprod & Bioproc Program, Pacific Agrifood Res Ctr, Summerland, BC V0H 1Z0, CanadaUniv Autonoma Queretaro, Programa Alimentos Ctr Republ PROPAC, Sch Chem, Res & Grad Studies Food Sci, Queretaro 76010, Qro, Mexico
机构:
Univ Autonoma Queretaro, Programa Alimentos Ctr Republ PROPAC, Sch Chem, Res & Grad Studies Food Sci, Queretaro 76010, Qro, MexicoUniv Autonoma Queretaro, Programa Alimentos Ctr Republ PROPAC, Sch Chem, Res & Grad Studies Food Sci, Queretaro 76010, Qro, Mexico
Campos-Vega, Rocio
;
Loarca-Pina, Guadalupe
论文数: 0引用数: 0
h-index: 0
机构:
Univ Autonoma Queretaro, Programa Alimentos Ctr Republ PROPAC, Sch Chem, Res & Grad Studies Food Sci, Queretaro 76010, Qro, MexicoUniv Autonoma Queretaro, Programa Alimentos Ctr Republ PROPAC, Sch Chem, Res & Grad Studies Food Sci, Queretaro 76010, Qro, Mexico
Loarca-Pina, Guadalupe
;
Vergara-Castaneda, Hayde A.
论文数: 0引用数: 0
h-index: 0
机构:
Nucitec SA CV, Colonia Penuelas, Queretaro, MexicoUniv Autonoma Queretaro, Programa Alimentos Ctr Republ PROPAC, Sch Chem, Res & Grad Studies Food Sci, Queretaro 76010, Qro, Mexico
Vergara-Castaneda, Hayde A.
;
Oomah, B. Dave
论文数: 0引用数: 0
h-index: 0
机构:
Agr & Agri Food Canada, Natl Bioprod & Bioproc Program, Pacific Agrifood Res Ctr, Summerland, BC V0H 1Z0, CanadaUniv Autonoma Queretaro, Programa Alimentos Ctr Republ PROPAC, Sch Chem, Res & Grad Studies Food Sci, Queretaro 76010, Qro, Mexico