STUDY ON MICROBIAL-DRIVEN SELECTIVE LIGNIN DEGRADATION CAPACITY OF RICE STRAW BASED ON BMP METHOD
Based on the bio-mechanical pulping method,the selective degradation of rice straw lignin by five microorganisms was evaluated by analyzing the model of straw component transformation,microscopic fiber morphology changes,and multidimensional mechanical property indexes.A lignin degradation reactor was designed for experimentation,and the results show that Phanerochaete chrysosporium had the highest lignin degradation rate(53.6% ),priority index(49.64),and selectivity coefficient(4.0606).The straw treated by this fungus exhibits significant improvements in tensile strength(19.24% ),shear strength(30.35% ),flexural strength(8.86% ),and elastic modulus(15.32% ).Microscopic morphology analysis indicates that the fiber length and width are reduced by 4.69% and 27.32%,respectively,with a fiber aspect ratio of 45.075.Simulation results demonstrated that the reactor has good flow and mixing performance.
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