Enzymatic versus chemical deinking of non-impact ink printed paper.
Enzymatic versus chemical deinking is examined for MOW and photocopy prints. Several enzymatic preparations and two fibre/ink particle separation methods are tested. Deinking was monitored by image analysis and standard pulp and paper characterisation procedures. The effectiveness of the fibre/ink particle separation method depends on the ink particle's size: for smaller particles a washing step is recommended whereas for larger particles, the use of flotation is necessary. The enzymatic treatment is a competitive alternative for MOW and photocopy paper deinking. However, the process requires the selection of an adequate enzymatic preparation for each paper grade.
Pala
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Centro de Engenharia Biológica, Universidade do Minho, Largo do Paço, 4719 Braga codex, Portugal.
Mota
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Gama
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FM
D001673:Biodegradation, Environmental; D002480:Cellulase / Q000737:chemistry; D003247:Conservation of Natural Resources; D004795:Enzyme Stability; D007091:Image Processing, Computer-Assisted; D007281:Ink; D008954:Models, Biological; D010209:Paper; D010316:Particle Size; D011327:Printing; D012037:Refuse Disposal
D002480:Cellulase