Effect of Laccase/Carbon Sources System Pretreatment on the Properties of Rice Straw Particleboard

Rice straw was pretreated with Laccase/carbon sources system to improve the propotites of rice-si raw particleboard. The optimum conditions for Laccase pretreatment, a comparison between Laccase/carbon sources system(LCS)and Laccase/mediator system(LMS) ,and the effect of the pretreatment on rice straw particleboards were investigated. The results indicated that LCS could completely replace the expensive LMS for degradation of lignin in rice-straw, the optimum conditions of pretreatment were pH value 5.0, pretreatment temperature 45℃ ,liquor ratio 1:7,pretreatment time 4-6h,enzyme usage 20~30IU/g. The physical and mechanical properties of the particlboard made from LCS pretreated straw,though didn't meet the requirement specified in standard, were greatly improved. The degrees of improvement of coarse and fine particleboard were different, fine particleboard was more improved than coarse particleboard.