Abstract
Biogas is an excellent renewable fuel providing gas for clean energy applications and fertilizers for organic farming. In the present study, seeds from four tree species of Acacia nilotica , Albizia lebbeck , Prosopis juliflora , and Leucaena leucocephala have been utilized for biogas production as alternative feedstocks. They have been investigated in a mixed-feeding mode in a single digester to tackle the feedstock availability and seasonality challenges. The investigations were conducted in a 300 L anaerobic digester for 120 days under daily feeding mode. The average specific biogas yield and specific methane yield was found to be 0.425 m 3 /kg of volatile solids and 0.228 m 3 /kg of volatile solids, respectively. The average volumetric methane content in biogas was 54.7%. This paper presents a unique study on anaerobic digestion of selected seeds in a mixed-feeding mode to provide broad opportunities for their efficient and sustainable utilization. • Interchangeability of tree species seeds explored for 120 days in the mixed-feeding mode for biogas production. • Anaerobic digestion parameters for the utilization of these seeds are investigated in detail. • An amount of 3.0–3.5 kg of seeds is required to produce one cubic metre of biogas. • Specific biogas yield of 0.425 m 3 /kg VS with methane of 54.7% and TVSMRE as 46.0% were found.
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