Bleach plant wash presses provide improved efficiency, low carryover

Bleached pulp mills can benefit from the lower effluent volumes of press-based bleach plant designs. A significant savings in building volume is possible by replacing fileters with presses. Another important aspect for introduction of presses is the improved possibility of reducing both water and st...

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Bibliographic Details
Published in:Pulp & paper 1994-05, Vol.68 (5), p.85
Main Authors: Germgard, U, Norstedt, A, Sjodin, L
Format: Magazinearticle
Language:English
Subjects:
Advantages
AGUAS RESIDUALES
BLANCHISSEMENT
BLANQUEADURA
BLEACHING
Chemical oxygen demand
CONTAMINANTES
Cost control
DECHET INDUSTRIEL
DESECHOS INDUSTRIALES
EAU USEE
Efficiency
INDUSTRIA DE LA PASTA Y EL PAPEL
INDUSTRIAL WASTES
INDUSTRIE DE PATE ET PAPIER
Methods
POLLUANT
POLLUTANTS
Pollution control
Pulp & paper mills
PULP AND PAPER INDUSTRY
Pulp mills
Washers & dryers
WASTEWATER
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Summary:Bleached pulp mills can benefit from the lower effluent volumes of press-based bleach plant designs. A significant savings in building volume is possible by replacing fileters with presses. Another important aspect for introduction of presses is the improved possibility of reducing both water and steam consumption in bleaching, as well as a reduction of carryover between different stages. This reduces both bleaching chemical consumption and the alkali and acid demand. All of these features facilitate closure of the bleach plant. A typical conventional bleach plant has 4 bleaching stages, and the bleaching is elemental chlorine-free. The press is a significantly better pulp washer than a filter. Compared with a filter, a press is more expensive. However, there are several indirect cost items that are lower when a press is used. Lower building costs and smaller filtrate tanks are the most obvious examples.
ISSN:0033-4081