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Alternative alkalis for peroxide bleaching of chemithermomechanical pulp
-
Liliane Savoye
,
Michel Petit-Conil
Published/Copyright:
November 1, 2018
Abstract
A total substitution of sodium hydroxide by weak alkali sources, namely Mg(OH)2, MgCO3 and Ca(OH)2, was studied in a two-stage peroxide bleaching of a maple chemithermomechanical pulp. For the same brightness, the optimised bleaching conditions for Mg(OH)2, MgCO3- and Ca(OH)2- based P1-P2 processes enabled to decrease the COD to more than 25%. Moreover, the biodegradability of bleaching effluents was enhanced, as reflected by the reduction of 1/3 of the recalcitrant COD remaining after the secondary wastewater treatment with activated sludge. Additionally, alternative alkali-based bleached pulp presented highest bulk and opacity than the conventional two-stage peroxide bleached pulp. Nevertheless, the use of weak alkali affected the development of strength properties, the tensile and tear indexes decreased by 25% and 16%, respectively, compared to NaOH-based bleached pulp. Eventually, this study demonstrated that the use of alternative alkalis instead of sodium hydroxide had not detrimental impact on the residual peroxide recycling.
Keywords: Bleaching; Calcium hydroxide; Chemithermomechanical pulp; COD; CTMP; Hydrogen peroxide; Magnesium carbonate; Magnesium hydroxide; Maple; R-COD; Recycling; Sodium hydroxide
Received: 2011-04-20
Accepted: 2011-09-12
Published Online: 2018-11-01
Published in Print: 2012-01-01
© 2018 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Bleaching;
Calcium hydroxide;
Chemithermomechanical pulp;
COD;
CTMP;
Hydrogen peroxide;
Magnesium carbonate;
Magnesium hydroxide;
Maple;
R-COD;
Recycling;
Sodium hydroxide
Articles in the same Issue
- Extraction and chemical characterization of Norway spruce inner and outer bark
- Hot-water extraction and characterization of spruce bark non-cellulosic polysaccharides
- Properties of cellulose pulps and their influence on the production of a cellulose ether
- Improved quality of SC magazine paper through enhanced fibre development using the ATMP process
- Alternative alkalis for peroxide bleaching of chemithermomechanical pulp
- Brightness development of a hydrogen peroxide bleached spruce TMP. Comparisons of pre-treatments with DTPA and a separable chelating surfactant
- Pressurised compressive chip pre-treatment of Norway spruce with a mill scale Impressafiner
- Relating ink solvent-coating component thermal properties to smearing and development of abrasion resistance in ink jet printing
- Effect of coating formulations and drying methods on the coverage and smoothness of brown grade base papers
- Improvement of the retention-formation relationship using three-component retention aid systems
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- The effect of fibre properties, fines content and surfactant addition on dewatering, wet and dry web properties
- Online detection of moisture in heatset printing: Liquid transfer to printed image and non-image areas
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- The effects of TMP and filler stratifying on wet web runnability and end product quality of fine paper
- Modelling of fibre orientation probability distribution in the jet-to-wire impingement
- Evaluation of furnishes for tissue manufacturing; suction box dewatering and paper testing
- Evaluation of a Novel Hydrocyclone Design for Pulp Fractionation
