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 user 2008-09-03 at 3:05:39 pm Views: 39
  • #20377
    Natural deinking process developed  
    Environmental friendly technology to remove ink stain in paper recycling
    greatest challenge in paper recycling is removal of polymeric ink and
    coating; and the most difficult paper is mixed office
    wastepaper.Traditional deinking processes involve large quantities of
    chemicals which are expensive and unfriendly to the environment. A
    better alternative would be a technology that involves biological

    The greatest challenge in paper recycling is
    removal of polymeric ink and coating. It was suggested that the most
    difficult raw material for deinking is the mixed office wastepaper
    especially the papers that had gone through photocopiers and laser

    Traditional deinking processes involve the use of
    large quantities of chemicals. Not only is this expensive, it causes
    pollution to the environment due to the excessive use of chemicals.
    Environmental friendly technology that exploits enzymes (biological
    molecules) potential has been the focus of many researches that look
    for lower operational cost and minimal environmental impact in paper
    deinking processes.

    Enzymatic treatment can achieve similar
    effect as chemical treatment. It can even improve the deinking results
    without affecting the physical properties in the final paper product.
    Application of enzyme stable in alkaline environment has been shown in
    other research to be effective in increasing the brightness and reduced
    the ink counts of recycled paper.

    A research project conducted
    by Universiti Malaysia Sarawak and Sarawak Forestry Corporation
    reported the use of a crude enzyme preparation for the enzymatic
    deinking of mixed office paper. The enzyme material was prepared by
    growing endoglucanase (enzyme use for the enzymatic treatment)
    producing Bacillus licheniformis BL-P7 in a liquid culture media
    containing sago pith waste and rice husk.

    The enzymatic effect
    was compared to the conventional chemical treatment. The enzymatic
    deinking process was reported to produce better deinking effects on the
    mixed office paper compared to conventional chemical methods. Ink
    detachment from the paper fibre was facilitated by the enzymatic
    modification of the fibre surfaces. Furthermore, the process proved to
    be more effective for the removal of larger ink particles. Also,
    properties such as brightness, air permeability, tensile, and tear were
    enhanced in the handsheets preparation of the recycled mixed office