Mills prepare for next century with new pulping, bleaching technologies

The most important goal in pulping is the development of those processes and equipment that allow full closure and thus recirculation of filtrates to evaporation and burning. In addition, a variety of new pulping processes are aimed at reducing the pollution load while producing pulp with acceptable...

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Bibliographic Details
Published in:Pulp & paper 1992-09, Vol.66 (9), p.79
Main Author: Forbes, D.R. (Jaakko Poyry Inc., Raleigh, NC)
Format: Magazinearticle
Language:English
Subjects:
BLANCHISSEMENT
BLANQUEADURA
BLEACHING
CAMBIO TECNOLOGICO
Capital expenditures
CHANGEMENT TECHNOLOGIQUE
Chemicals
Chlorine
Cost control
Dioxins
ENVIRONMENTAL IMPACT
Environmental regulations
ESTADOS UNIDOS DE AMERICA
ETATS UNIS
IMPACT SUR L'ENVIRONNEMENT
IMPACTO AMBIENTAL
INDUSTRIA DE LA PASTA Y EL PAPEL
INDUSTRIE DE PATE ET PAPIER
Lignin
Paper industry
Pollution control
Product quality
Production increases
Pulp & paper industry
PULP AND PAPER INDUSTRY
Pulp mills
TECHNICAL PROGRESS
Technological change
TECHNOLOGICAL CHANGES
USA
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Summary:The most important goal in pulping is the development of those processes and equipment that allow full closure and thus recirculation of filtrates to evaporation and burning. In addition, a variety of new pulping processes are aimed at reducing the pollution load while producing pulp with acceptable strength properties and bleachability. Some alternative pulping processes being developed include: solvent pulping, alcell, ester pulping, and biopulping. Dioxin discharges have become the major environmental issue of the 1990s in the US. Pulp mills are now in the process of basing dioxin discharge limits for their effluents on Ambient Water Quality Criteria (AWQC). The EPA-recommended AWQC is 0.013 ppq. The technology that the industry is selecting includes high-substitution chlorination in practically all cases and oxygen delignification, extended cooking, and improved washing, depending on mill conditions.
ISSN:0033-4081