| Abstract [eng] |
In this project study, anaerobic digestion to produce biogas from non-recyclable paper waste fractions and paper mill sludge was analyzed. The main components of paper – lignin, hemicellulose and cellulose are also the components of waste paper fractions. Anaerobic digestion of paper mill sludge and non-recyclable paper waste is relevantly new way to utilize these kinds of waste. In this study a theoretical methane yield from lignin (C11H14O4)n, cellulose – (C6H10O5)n and hemicellulose – (C5H8O4)n was analyzed. Total annual biogas yield from paper mill sludge in Lithuania vary from 138 thousand to 149 thousand m3 depending on manufacturing process. If used as fuel – 5 million MWh of electricity could be produced annually. Total theoretical methane yield from digestion of non-recyclable paper waste in Lithuania is 35,3 million m3/a. Energy potential from this amount of biogas is 1,7 million GWh/a. These indicators were calculated with the efficiency of 100% and excluded biological factors that can strongly determine the digestion process efficiency. Biogas yield can be as low as 50% theoretical, if applied in practice. |
