Deinking with enzymes : a review

Biotechnological processes are receiving greater attention as industry seeks to reduced its impact on the environment. In the pulping arena, 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. While the potential of enzyme-based deinking appears to be quite good, further research in a few areas is needed to fully exploit the same. Application : an overview of recent developments in the use of enzymes for deinking.