Biodeinking

Chapter

Abstract

Ink removal is a significant technical hurdle to the greater use of recycled paper. Conventional deinking process requires significant energy input and harsh chemical usage to help dislodge ink particles from fiber surfaces and enhance the removal of ink particles. Enzyme-based deinking shows promise as a means of reducing chemical use and wastewater treatment. Brightness response to enzyme treatment varies considerably but it often rivals or surpasses brightnesses obtained with conventional deinking processes. Residual dirt count for enzymatically deinked pulps is also generally lower. Additional benefits include higher freeness and greater paper strength. Results for pulp yield are inconclusive. Several enzymes have been used for deinking of various recycled fibers but the main enzymes used are cellulases and hemicellulases. Extensive research has been undertaken that demonstrates the application of enzymes and their effectiveness. Different mechanisms for ink removal by enzymes have also been proposed. Operating conditions must be optimized for successful deinking.

Keywords

Deinking Conventional deinking Enzymatic deinking Recycled paper Freeness Strength properties Enzymes Lipases Esterases Pectinases Hemicellulases Cellulases Amylases Ligninolytic enzymes 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.Pulp and Paper ConsultantKanpurIndia

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