Valorization of different landrace and commercial sorghum ( <i>Sorghum bicolor</i> (L.) Moench) straw varieties by anaerobic digestion

To reduce the impact on environment and enhance sustainability of resources, it is necessary to promote strengthen use landrace cultivars that advocate regenerative agriculture. In this study, growth development as well anaerobic digestion (AD) six different cultivars, two commercial hybrids a public genotype Sorghum bicolor have been evaluated. The in general, presented greater heights, biomass yields compactness shoots similar or an improvement grain production compare varieties. AD sorghum straws was performed batch mode at mesophilic temperature (35°C). cultivar Zahina (ZH) obtained highest final methane yield (413 ± 79 NL CH4 kg−1 VS, volatile solids) but gigante (ZHG) Trigomillo (TG) were ones per (13.7 12.7 shoot unit−1, respectively). By contrast, varieties lowest yields. Two mathematical models, first-order kinetics Transference Function model, used fit experimental data with aim describing simulating biodegradation these S. straw obtaining kinetic constants. Both models allowed for adequately fitting results time. particular, fastest biomethanization occurred using variety PR88Y20 (PR88) (specific rate constant k = 0.148 0.008 days−1), while slowest one from Panizo (PAN) (k 0.064 0.005 days−1). addition, values maximum rate, Rm, attained ZH PR88, which 87.1% 71.3% higher than achieved PAN variety, exhibited value.