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Title
Effect of enzyme concoctions on fiber surface roughness and deinking efficiency of sorted office paper
Authors
DHARM DUTT C. H. TYAGI R. P. SINGH and A. KUMARG-FEI WANG
Received
February 14, 2012
Published
Volume 46, Issue 9-10 November-December
Keywords
sorted office paper, biodeinking efficiency, enzyme concoctions, fiber surface roughness
Abstract
Bio-deinking of sorted office paper (SOP) by various enzyme concoctions having cellulase, xylanase, amylase and
lipase was investigated. The effect of various enzyme concoctions on pulp brightness, effective residual ink
concentration (ERIC), deinkability factor based on brightness (DB), deinkability factor based on ERIC (DE), dirt counts,
strength properties and effluent characteristics was studied and compared with their respective control. Also, the effect
of different enzyme concoctions on fiber surface and fiber morphological changes during the deinking process were
studied by atomic force microscopy (AFM) and scanning electron microscopy (SEM). Results showed that, compared
to control, a maximum improvement in brightness by 13.30% (ISO), DB 37.79%, and DE 83.0% and a reduction in
ERIC and dirt counts by 68.18 and 88.04%, respectively, were achieved with a concoction of
cellulase+xylanase+amylase+lipase at a dosage of 6, 3, 1.5 and 6 IU/mL, respectively. This indicated that there was a
synergistic deinking effect among the concoctions of these enzymes as fiber surface roughness increased by 159%
compared to control.
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