CONCLUSION
From the results it could be conclude that biogas generated from paper waste have highest percentage of methane followed by that of saw dust and then biogas from cow dung is the third. Based on methane content only it could be concluded that Biogas from Paper waste is of best quality compared to others. But in terms of CO2 content and H2S percentage content, the paper waste and saw dust are the worst because of high percentages of diluents gasses and also the lower biogas production rate of the two substrates. On the basis of yield cow dung is the most suitable substrate for biogas production.