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Selective purification of bleached spruce TMP process water by induced air flotation (IAF)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.ORCID iD: 0000-0002-0770-2086
Laboratory of Wood and Paper Chemistry, Åbo Academy University, Porthansgatan 3, 20500 Turku, Finland .
Laboratory of Wood and Paper Chemistry, Åbo Academy University, Porthansgatan 3, 20500 Turku, Finland .
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
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2014 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 68, no 2, p. 157-165Article in journal (Refereed) Published
Abstract [en]

The environmentally benign closure of water systems in paper mills leads to the problem of accumulation of dissolved and colloidal wood substances (DCS) in process water. Notably, pitch affects the pulp and paper production negatively and increases the demand for additional treatment of the process water. In the present article, the purification of thermomechanical pulping process water from the alkaline peroxide bleaching stage has been investigated, with the induced air flotation (IAF) in focus. The following parameters were considered concerning the IAF efficiency to remove detrimental substances: concentration of cationic foaming agent, pH value, calcium concentration, and temperature. The amounts and characteristics of residual DCS were determined by gas chromatography and turbidity measurements. Residual concentrations of the foaming agent dodecyltrimetylammonium chloride were determined by electrospray ionization mass spectrometry. Up to 90% of pitch was removed, whereas hemicelluloses, which are important in preventing pitch problems, remained in the waters. Up to 70% of the pectic acids accounted for the high cationic demand of the process waters were removed by optimization of the IAF parameters. The presented separation process gives new opportunities to a selective purification of the process waters.

Place, publisher, year, edition, pages
2014. Vol. 68, no 2, p. 157-165
Keywords [en]
cationic dodecyltrimetylammonium chloride (DoTAC), cationic foaming agent (DoTAC), colloidal wood pitch, induced air flotation, mechanical pulp, pectic acids, peroxide bleaching
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:miun:diva-19809DOI: 10.1515/hf-2013-0045ISI: 000331947600003Scopus ID: 2-s2.0-84900602252OAI: oai:DiVA.org:miun-19809DiVA, id: diva2:644075
Note

Published online 2013-08-10.

Available from: 2013-08-29 Created: 2013-08-29 Last updated: 2017-12-06Bibliographically approved

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Zasadowski, DariusEdlund, HåkanNorgren, Magnus

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