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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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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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creator	Germgard, U Norstedt, A Sjodin, L
description	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.
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source	ABI/INFORM Global (ProQuest)
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
title	Bleach plant wash presses provide improved efficiency, low carryover
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