Assessment of Biogas Production from Energy Crop Using Animal Manure as Co-substrate Through Portable Reactor

The study is based on production of Biomethane by using Napier grass along with co-substrate as a cow dung. The lignocellulosic content in Napier species increases with development of the grass. The principal cut gives more Biomethane potential than the later cuts since water-dissolvable sugars are higher in previous case coming about higher methane potential. The parameters like pH, moisture content, total solids, volatile and fixed solids, chemical composition, TSS, and TDS were measured. An economical bioreactor having 35 L working volume was designed for evaluating the biogas potential of above substrates and was operated at ambient temperature range 20–32 °C. The outcomes revealed that there was a continuous reduction in pH level, i.e., up to 4.6 during initial fifteen days since beginning of slurry feeding. The average gas production of continuous mode biogas digester and Batch mode digester containing of slurry feed gave a result of 0.43 and 0.34 m³/kg VS added, respectively, at an average temperature of 29.91 °C. The Napier grass test unit showed 88.38% VS removal during the studies and the chemical composition for the Yeshwant specie of Napier grass showed lignin, cellulose, hemicellulose, and ash content as 32.2, 35.9, 40.1, and 3.2%, respectively.