BIO-SODA-ETHANOL-WATER(BIO-SEW)DELIGNIFICATION OF LIGNOCELLULOSIC RESIDUES OF CYMBOPOGON MARTINIWITH PHANEROCHAETE CHRYSOSPORIUM

摘要

Cymbopogon martini,commonly known as palma rosa grass,is cultivated for the important palma rosa oil it provides.The lignocellulosic residues of C.martini resulted from steam distillation are used for land filling,thus creating environmental problems.This hitherto unexploited source of lignocellulose biomass,obtained after steam distillation of C.martini,could be successfully used for the production of chemical grade pulp.C.martini had a low lignin content and a more open and looser structure,which makes it suitable for biopulping.The openness of the pile,the heterogeneity of the tissues and the vast exposed surface area favor the growth and colonization of the lignocellulosic residues of C.martini by a multitude of microorganisms.Phanerochaete chrysosporium was grown in solid state culture on solid wastes of C.martini.The lignocellulose substrate contained 13.6% lignin,74.4% holocellulose and a pentosan fraction of 25.4%.After 28 days at 40°C,P.chrysosporium produced a residue from the lignocellulosic wastes of C.martini with a higher in vitro dry matter digestibility.P.chrysosporium degraded 30.11% of lignin,62.25% of pentosan and 18.60% of holocellulose from the original value of the lignocellulosic residues of C.martini.Further on,the P.chrysosporium treated lignocellulosic residues of C.martini were delignified by SEW pulping.The aim of the bio-SEW pulping of the lignocellulosic residues of C.martini is basically that of reducing the kappa number and of improving the screened pulp yield,as the process is highly specific in action,requiring milder conditions.The bio-SEW pulping process shows an improvement in pulp yield by 0.90% and a reduction in kappa number by 1.30 units.