MITIGATION OF ABSORBABLE ORGANIC HALIDES IN COMBINED EFFLUENTS OF WHEAT STRAW SODA-AQ PULP BLEACHED WITH CELLULASE-POOR CRUDE XYLANASES OF COPRINELLUS DISSEMINATUS IN ELEMENTAL CHLORINE FREE BLEACHING

摘要

Novel cellulase-poor crude xylanases from strains SH-1 NTCC-1163 (enzyme-A), and SH-2 NTCC-1164 (enzyme-B) of Coprinellus disseminata, mitigated kappa number (56.27 and 58.41%) of wheat straw soda-AQ pulp after OX~AE and OX E bleaching stages, respectively. Significant reductions in AOX (25.00 and 22.05%), with a slight decrease in some strength properties, owing to removal of hemicelluloses, was observed. The removal of hemicelluloses was further validated by an increase in pulp viscosity (6.82 and 4.93%), COD (43.15 and 43.15%) and colour (51.99 and 62.99%) for OX~AE1D1E2D2 and OX~BE1D1E2D2 sequences, respectively, compared to their respective controls.