Biochemical methane potential of oil-extracted microalgae and glycerol in co-digestion with chicken litter.

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José Carlos Meneses-Reyes1, Guadalupe Hernández-Eugenio1, David H. Huber2,3, Nagamani Balagurusamy4, Teodoro Espinosa-Solares1*

1Posgrado en Ingeniería Agrícola y Uso Integral del Agua, Universidad Autónoma Chapingo, Chapingo, Estado de México 56230, Mexico

1Gus R. Douglass Institute, West Virginia State University, Institute, WV 25112-1000, USA

3Department of Biology, West Virginia State University, Institute, WV 25112-1000, USA

4Laboratorio de Biorremediación, Escuela de Ciencias Biológicas, Universidad Autónoma de Coahuila, Torreón 27000, Coahuila, Mexico

*t.espinosa.s@taurus.chapingo.mx

The objective of this work was to evaluate the technical feasibility of using both oil-extracted microalgae (M) and glycerol (G) in co-digestion with chicken litter (CL), thereby improving biochemical methane potential (BMP). Different feedstock ratios of M (0–30%), G (0–3%) and CL (67–100%) were investigated to determine the best co-digestion condition under mesophilic conditions. According to the modified Gompertz model, the best BMP (131.1 mL CH4 g-1 VS fed) was obtained with the triple co-digestion (M:G:CL) in a proportion of 30:3:67. This yielded a methane production rate of 3.3 mL CH4 g-1 VS fed d-1 and a lag time (k) of 17.4 d. This treatment reduced chemical oxygen demand (COD) by 91.02% and increased the methane yield 15.8% with respect to the CL control.

BMP-microalgae-glycerol-litter


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