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AOX formation in ECF bleaching at different kappa numbers: Influence of oxygen delignification and hexenuronic acid content
Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
2002 (English)In: Tappi Journal, 1(2002)7, 20-24, Vol. vol 1 no 7Article in journal (Refereed)
Abstract [en]

he aim of this study was to determine how oxygen delignification before bleaching and the hexenuronic acid (HexA) content of the pulps influenced the acisorbable organic halogen (AOX) formation in the elemental chlorine free (ECP) bleaching effluent. Softwood industrial chips cooked to different kappa numbers were oxygen defignified, treated in a hot acid stage (A*), or not pretreated at all before ECF bleaching. We compared the AOX levels in the ECF effluents from bleaching of these pulps. There was a higher formation of AOX for oxygen delignified pulps than for non-oxygen delignified pulps compared at the same kappa number before ECF bleaching. The hexenuronic acid (HexA) content of the pulps had a major impact on the AOX levels in the D[0] effluent. The oxygen delignified pulps had a higher HexA content than the non-oxygen delignified pulps compared at the same kappa number. This explains the higher AOX formation from oxygen delignified pulps. The AOX originating from HexA was not stable upon storage. Application, This study gives additional insight on the AOX formation in ECF bleaching. The information may be used to take appropriate measures when addressing environmental issues

Place, publisher, year, edition, pages
2002. Vol. vol 1 no 7
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-16964OAI: oai:DiVA.org:kau-16964DiVA: diva2:590565
Note

Distrubution: Via KaU or Tappi Journal

Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21

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