منابع مشابه
Enzymes Improve Ecf Bleaching of Pulp
The delignification efficiency of different laccase enzymes was examined on the eucalyptus Kraft pulp. The laccase enzyme from Trametes versicolor showing the highest delignification efficiency was selected and used in the elemental chlorine-free bleaching sequence for improving the pulp bleachability. An appreciable reduction in chlorine dioxide consumption was also obtained. Further reduction...
متن کاملEffluent Loads From Different ECF Bleaching Sequences Used In Hardwood Kraft Pulp Bleaching
Effluent loads from different traditional and emerging ECF bleaching sequences were investigated. Oxygen delignified Eucalyptus camaldulensis and Acacia mangium kraft pulps having similar kappa number, ca 12.0 were used in this study. Different ECF bleaching sequences were compared with reference sequence, D0EopD1 in terms of effluent load, such as AOX, COD and TOC. Depending on the nature of s...
متن کاملbleaching effect of ozone on pigmented teeth
background: there have been numerous researches on ozone application in dentistry; yet the data regarding its whitening effect is very limited. the present study compares the bleaching effect of ozone with offi ce bleaching. materials and methods: in this experimental study, 15 maxillary premolar teeth were selected and sectioned mesio-distally and bucco-lingually. the sections were then placed...
متن کاملOptimization of Ecf Bleaching and Refining of Kraft Pulping from Olive Tree Pruning
The aim of the present work was to find an optimum kraft pulping process for olive tree pruning (OTP) in order to produce a bleachable grade pulp of Kappa number about 17. The kraft pulp produced under optimized conditions showed a viscosity of 31.5 mPa.s and good physical, mechanical, and optical properties, which are acceptable for paper grade production. The strength and optical properties w...
متن کاملGenotoxicity and toxicity evaluations of ECF cellulose bleaching effluents using the Allium cepa L. test.
Toxicity and genotoxicity tests were performed on root cells of Allium cepa in order to evaluate wastewater quality following an ECF cellulose bleaching process. The results revealed a toxic effect of the effluent, with inhibition of meristem growth and generally lower values of metaphase, anaphase and telophase indices at pH 10.5 than pH 7 for all effluent concentrations. The genotoxicity effe...
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ژورنال
عنوان ژورنال: JAPAN TAPPI JOURNAL
سال: 2003
ISSN: 0022-815X,1881-1000
DOI: 10.2524/jtappij.57.1011