Abstract

The effects of cellulase enzymes (Trichoderma reesei) in flotation deinking of mixed office wastes (MOW) on the deinking efficiency, physical and optical properties of the papers were investigated. In order to determine the effects of cellulase, conventional chemical deinking was also performed and compared with enzymatic deinking. After deinking processes, the handsheets were produced to determine deinking efficiency and physical and optical properties. Dirt particle analyses, Effective Residual Ink Concentrations (ERIC) and deinking efficiency (IEERIC) were determined to clearly understand effects of cellulase on deinking of MOW. IEERIC values of papers obtained from enzymatic and chemical deinked pulps were 11.9 and 62.0%, respectively. Use of cellulase enzyme by itself was not as effective as conventional deinking. Furthermore, optical properties of enzymatic deinked papers were lower than those of chemical deinked papers. These negations were eliminated by combining enzymatic and chemical deinking processes. Chemical charge used in conventional deinking were reduced by half with using cellulase. Properties of papers obtained from this deinking process were better than both enzymatic and chemical ones. This suggests that using cellulase enzyme in deinking process of MOW have a great potential as an alternative to chemical conventional deinking per se.

抽象的

纤维素酶的作用（里氏木霉）在浮选混合办公废物的脱墨中，对纸张的脱墨效率，物理和光学性能进行了研究。为了确定纤维素酶的作用，还进行了常规的化学脱墨并将其与酶促脱墨进行比较。在脱墨过程之后，生产手抄纸以确定脱墨效率以及物理和光学性质。确定污垢颗粒分析，有效残留墨水浓度（ERIC）和脱墨效率（IEERIC）以清楚地了解纤维素酶对MOW脱墨的影响。从酶和化学脱墨纸浆获得的纸张的IEERIC值分别为11.9％和62.0％。纤维素酶本身的使用不如常规脱墨有效。此外，酶促脱墨纸的光学性能低于化学脱墨纸。通过结合酶和化学脱墨工艺消除了这些否定。通过使用纤维素酶，传统脱墨中使用的化学电荷减少了一半。通过这种脱墨过程获得的纸张的性能优于酶和化学两种。这表明在纤维素的脱墨过程中使用纤维素酶作为化学常规脱墨的替代品具有很大的潜力。