【摘要】 探讨了漆酶和淀粉酶混合脱墨的最佳配比及碱抽提对混合酶脱墨的影响,比较了生物法脱墨与化学法脱墨的效果。研究结果表明,漆酶与淀粉酶混合脱墨的最佳配比为40∶60;混合酶脱墨后再经碱抽提,脱墨浆白度和油墨脱除率分别达91.6%和92.1%;与化学法脱墨相比,混合酶脱墨后浆料的白度和油墨脱除率分别提高7.1个百分点和14.2%,裂断长和撕裂指数分别提高14.7%和11.3%,滤水性也明显提高,得率与化学法脱墨浆相近。同时,还利用显微镜观察了酶脱墨浆的纤维形态,并分析了酶脱墨浆和化学脱墨浆的尘埃度。更多还原

【Abstract】 The ink in mixed office wastepaper is difficult to remove because of its complex composition and existing of adhesive,sizing agent and filler.Since laccase possesses the ability to catalyze and oxidize phenol and aromatic amine compounds while amylase can decompose starch,the mixed enzyme of laccase and amylase was used for deinking of mixed office wastepaper in this paper.The optimum ratio of laccase and amylase was investigated on the basis of their optimum deinking conditions that had been obtained in the previous research.The effect of alkaline extraction on mixed enzyme deinking was discussed.The result of mixed enzyme deinking was compared with that of chemical deinking.The results indicated that the optimum ratio of laccase and amylase was 40∶60.After mixed enzyme deinking,the brightness and the removal rate of the ink were 86.5% SBD and 74.2% respectively.The mixed enzyme deinking followed by alkaline extraction led the brightness and deinking efficiency of the pulp to 91.6%SBD and 92.1% respectively.Compared with chemical deinking,the brightness and deinking efficiency of the enzyme deinked pulp increased by 7.1%SBD and 14.23%,the breaking length and tearing index increased by 14.7% and 11.3% respectively,the drainage property was obviously improved,the yield was similar.The validity of the experiment results mentioned above was confirmed by microscope observation and speck analysis.更多还原