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Membrane technologies for three different pulp and paper applications are currently under investigation at the Pulp and Paper Research Institute of Canada. These are:
- Ultrafiltration and Reverse Osmosis for the treatment of mechanical pulp mill effluents and water reuse,
- Electrolysis of a portion of weak black liquor in kraft mills for providing incremental kraft recovery capacity, low sodium and sulphur lignin and pure caustic, and
- Bipolar Membrane Electrodialysis for the production of bleaching chemicals (e.g. caustic and chloric acid) while, at the same time, addressing a number of chemical imbalance problems at kraft mills.
This paper reviews these three technologies in terms of technical feasibility, process integration and economics.
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Membrane Technologies for Pulp and Paper Applications, 1993 Environmental Conference Proceedings
