Biogas Synthesis from Leather Industry Solid Waste in Pakistan

摘要

About 80% of raw material of the leather industry ends up in waste, which poses a great problem for waste management. During the current study, economical and ecofriendly techniques for conversion of tannery waste into biogas were evaluated. Fats, shavings and dried sludge showed 50%, 65% and 61% organic content and 68%, 45% and 9.6% moisture content, respectively. Dried sludge, pre-tanning waste (fats and shavings) and manure were digested either alone or in different combinations through amber glass bottles. The temperature was maintained from 32 degrees C to 35 degrees C by insulating digesters with sand at pH 6.8 to 7.5. The maximum amount of biogas (1623 +/- 26.1 ml/kg) was observed by digesting equal proportions of manure and dried sludge. The results depicted that 473 +/- 9.19 ml of biogas was biosynthesized from 1kg of sample comprising 25% pre-tanning waste and 75% manure.