Comparative Study of Biogas Production from Locally Sourced Substrate Materials

Abstract

Comparative study of biogas production from Cow dung (CD), Millet husk (MH), Rice husk (RH), Saw dust (SD) and Paper waste (PW) was conducted. The biogas production potentials for the substrates were of the order: Cow dung (8772.50cm3) > Millet husk (6680 cm3) > Rice husk (1386.25 cm3) > Saw dust (973.75 cm3) > Paper waste (476.25 cm3). Physico - chemical analysis revealed decreasing pH in the spent slurry indicating acidification of the content. The ash content is higher in the spent slurry ranging from 16 – 24% for the raw substrate and between 18 and 29% for the spent slurry. Kinetic studies show the slurry concentration have a direct relationship to the volume of biogas produced from all the substrates. There was strong  correlation between slurry concentration and the volume of biogas generated.