特异腐质霉角质酶-锚定肽融合蛋白的特性及在处理再生纸胶黏物中的应用

随着森林木材资源的减少,废纸回收利用越来越受到人们的重视.然而,废纸回收利用过程中产生的胶黏物会对再生纸的生产造成严重影响.生物法控制胶黏物主要是通过酶断裂胶黏物组分之间的酯键,防止胶黏物的絮凝,具有高效、专一、无污染等优势.角质酶是一种丝氨酸酯酶,可降解胶黏物中的部分成分.相关研究表明,锚定肽tachystatin ...     

Environmental assessment of enzyme assisted processing in pulp and paper industry

Background Aims and Scope  The pulp and paper (P&P) industry is traditionally known to be a large contributor to environmental pollution due its large consumptions of energy and chemicals. Enzymatic processing, however, offers potential opportunities for changing the industry towards more environmentally friendly and efficient operations compared to the conventional methods. The aims of the present study has been to investigate whether the enzyme technology is a more environmentally sound alternative than the conventional ways of producing paper. The study addresses five enzyme applications by quantitative means and discusses the environmental potential of a range of other enzyme applications by qualitative means. Methods  LCA is used as analytical tool and modelling is facilitated in SimaPro software. Foreground LCA data are production/company specific and collected from P&P technology service providers, specific P&P companies and P&P researchers. The background data on energy systems, auxiliary chemicals, etc. are primarily taken from the ecoinvent database. Results  The study shows that fossil energy consumption and potential environmental impacts (global warming, acidification, nutrient enrichment, photochemical smog formation) induced by enzyme production are low compared with the impacts that they save when applied in bleach boosting, refining, pitch control, deinking, and stickies control. Discussion  The general explanation is that small amounts of enzyme provide the same function as large amounts of chemicals and that enzymatic processes generally require less fossil energy inputs than conventional processes. Data quality assessments and sensitivity analyses indicate that this observation is robust for all processes except deinking, although the results are subject to uncertainty and much variation. Conclusions and Recommendations  The environmental improvements that can be achieved by application of enzymatic solutions in the P&P industry are promising. To get a greater penetration of enzymatic solutions in the market and to harvest the environmental advantages of biotechnological inventions, it is recommended that enzymatic solutions should be given more attention in, for instance, ‘Best Available Technology’ notes within the framework of the European Directive on Integrated Pollution Prevention and Control (IPPC). ESS-Submission Editor: Roland Hischier (roland.hischier@empa.ch)