Title of Thesis
Yield and Composition of Biogas Resulting from
Methanogenic Fermentation of Various Substrates
National Centre for Excellence in Physical
Chemistry / University of Peshawar, Peshawar
|Number of Pages|
|Keywords (Extracted from title, table of contents and
abstract of thesis)|
Yield, Composition, Biogas,
Resulting, Methanogenic, Fermentation, Substrates, Euphorbia Halioscopia, Trifolium Resupinatum
Different agricultural and municipal wastes were admixed with buffalo dung as supplements. They were anaerobically fermented to produce biogas and manure.
The fermentation was carried out at both the mesophilic (35°C) and thermophilic (45°C) ranges of temperature.
The results obtained from these studies show that the Trifolium Resupinatum, Cauliflower's Residues (leaves and stem), Euphorbia Halioscopia and Bombax Cepa flowers produced the biogas with high methane content 68 - 72%. The studies also showed that those which have high carbohydrate and fat content but low protienous matter can be treated with NH4HCO3 to produce good quality biogas. Euphorbia Halioscopia can also be used for this purpose although the yield of biogas is low but the methane content is high.
It was observed in thermophilic range of temperature that at 45°C the latent period was shorter and the percentage of methane in biogas was low.
The volatile fatty acids produced during fermentation were analysed gas chromatographically and correlation was sought between their decomposition and quality of the gas produced.
The remaining slurry was analysed for micro and macro nutrients and it showed the promise of being a good manure.