Effect of Pre-treatment Method on Biomethanation of Jatropha De-Oiled Cake

摘要

Lignocelluloses are often a major or sometimes the sole components of different waste streams from various industries, forestry, agriculture and municipalities. Hydrolysis of these materials is the first step for either digestion to biogas (methane) or fermentation to ethanol. However, enzymatic hydrolysis of lignocelluloses with no pretreatment is usually not so effective because of high stability of the materials to enzymatic or bacterial attacks. The reason for improved rate of hydrolysis by removal of lignin might be related to a better surface accessibility for enzymes by increasing the population of pores after removing of lignin. We used different methods of pretreatment for jatropha deoiled cake, which then was used for its conversion to biogas. Effective parameters in pretreatment of lignocelluloses, such as protection by lignin are described here. Several pretreatment methods were used to study their effects on delignification and anaerobic digestion of biomass was seen. We have tried different pretreatments method for delignification of jatropha deoiled cake and were found that acid hydrolysis with 50% conc. sulphuric acid yield more acid soluble lignin as compared to 72% conc. sulphuric, resulting in comparatively economical method for pretreatment. Further, alkaline hydrolysis can also be claimed as a good method for delignification of jatropha deoiled cake. However, the methane content in biogas obtained was maximum with acid treated biomass as compared to alkaline treated biomass.