• Title/Summary/Keyword: 탈묵

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Effects of Endoglucanase and Exoglucanase from Trichoderma viride on Brightness and Physical Properties of Deinked Old Newsprint (Trichoderma viride로부터 분리한 Endoglucanase 및 Exoglucanase가 탈묵 펄프의 백색도 및 물리적 강도에 미치는 영향)

  • 김동원;정영규장영훈손기향
    • KSBB Journal
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    • v.11 no.6
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    • pp.718-725
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    • 1996

  • Old newsprint was deinked with endoglucanase, exoglucanase and their various compositions from Trichoderma viride. The yield decreased with an increase in enzyme concentration. Especially, it was the lowest in the treatment of endo-exo mixture(1:1). It may be regarded as a synergistic actions of the cellulase components. The brightness was the highest in pulp deinked with endo-exo mixture(1:1). Maximum brightness was observed when 0.5mg/mL of the endo-exo mixture was used. The physical strength increased with increasing concentration in exoglucanase. But, it decrease with increasing concentration in endoglucanse and endo-exo mixture(1:1). Also, we investigated the yield, brightness and physical strength of endoglucanase in combination with exoclucanase(12:1, 8:1, 4:l, 1:1, 1:4, 1:8, 1:12). Maximal deinking conditions, obtained at a specific optimal ratio of endoglucanase to exoglucanse are as follow ; 12:1 for yield, 12:1 for brightness, 4:1 for tensile strength, 12:1 for bursting strength, and 8:1 for tearing strength. These results indicated that the deinking depended largely upon the action of endoglucanase. Exoglucanase was occupying more than 60% of the total crude cellulase contents. Therefore, the most effective deinking must repress the action of exoglucanase.

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Interface Chemical and Hydrodynamic Aspects of Deinking Process Using Flotation for Waste paper Recycling(II) (부유선별법을 적용한 탈묵공정의 계면화학적 및 수력학적 원리(II) -수력학적 원리를 중심으로-)

  • Sun-Young Park
    • Resources Recycling
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    • v.5 no.4
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    • pp.11-16
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    • 1996

  • In the flotation system for deinking process, the ink partcles musl collidc with the air bubbles for adhesion The probability of bubble-particle collision is largely dependent on the hydrodynamic conditions The main reason for the very small ink particles not to be able to float easily may be tound in the hydrodynamic effects, which make small ink particlcs move following the slreamlines around the bubbles rather than achually collide with bubbles. Also. the low floatabdily of the large and heavy ink particles is due to the gravity force and viscous drag which affect uprising molinn of particles through the liquid. Therefore, it is vely important to control not only the surface chemical conditions but the hydrodynamic conditions in practical floialion system

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