Reduction of adsorbable organically bound halogens (AOX) formation at near-neutral pH chlorine dioxide bleaching of softwood kraft pulp

Sara Starrsjö 1 , 2 , 3 , Olena Sevastyanova 2 , Peter Sandström 1 , Juha Fiskari 3 , Maria Boman 1  and Mikael E. Lindström 2
  • 1 SCA R&D Centre, Sidsjövägen 2, 851 21, Sundsvall, Sweden
  • 2 Department of Fiber and Polymer Chemistry, KTH Royal Institute of Technology, Teknikringen 56-58, 100 44, Stockholm, Sweden
  • 3 Department of Chemical Engineering, Mid Sweden University, Holmgatan 10, 851 70, Sundsvall, Sweden
Sara Starrsjö
  • Corresponding author
  • SCA R&D Centre, Sidsjövägen 2, 851 21, Sundsvall, Sweden
  • Department of Fiber and Polymer Chemistry, KTH Royal Institute of Technology, Teknikringen 56-58, 100 44, Stockholm, Sweden
  • Department of Chemical Engineering, Mid Sweden University, Holmgatan 10, 851 70, Sundsvall, Sweden
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, Olena Sevastyanova
  • Department of Fiber and Polymer Chemistry, KTH Royal Institute of Technology, Teknikringen 56-58, 100 44, Stockholm, Sweden
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, Peter Sandström, Juha Fiskari
  • Department of Chemical Engineering, Mid Sweden University, Holmgatan 10, 851 70, Sundsvall, Sweden
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, Maria Boman and Mikael E. Lindström
  • Department of Fiber and Polymer Chemistry, KTH Royal Institute of Technology, Teknikringen 56-58, 100 44, Stockholm, Sweden
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Abstract

Recently, a new type of bleaching sequence, Elemental Chlorine Free (ECF) light with one D stage, has been developed. It combines the efficiency and high selectivity of chlorine dioxide (ClO2) bleaching with more environmental friendly oxygen based bleaching chemicals. This work examines the effect of pH on the formation of adsorbable organically bound halogens (AOX) in an intermediate D stage – a single ClO2 stage at the middle of an ECF light bleaching sequence. Carbon dioxide (CO2) is used to generate a bicarbonate buffer in situ, stabilizing the pH during the bleaching. Near-neutral pH is hypothesized to decrease the formation of strongly chlorinating species, so that the AOX formation is reduced. The results indicate that a near-neutral pH D stage can reduce the AOX content in the effluents with up to 30%. The ISO brightness was unchanged to a lower ClO2 consumption. The pulp viscosity was slightly higher after near-neutral pH D stage, but to its disadvantage a lesser delignification and removal of HexA was obtained. The degradation of HexA correlated well with the AOX, affirming earlier theories that HexA has a major impact on the AOX formation. The higher amounts of residual HexA and lignin resulted in more thermal yellowing of the pulps bleached with a near-neutral pH D stage.

  • Ahn, K., Zaccaron, S., Zwirchmayr, N.S., Hettegger, H., Hofinger, A., Bacher, M., Henniges, U., Hosoya, T., Potthast, A., and Rosenau, T. (2019). Yellowing and brightness reversion of celluloses: CO or COOH, who is the culprit?. Cellulose 26: 429–444, https://doi.org/10.1007/s10570-018-2200-x.

    • Crossref
    • Export Citation
  • Ali, M. and Sreekrishnan, T.R. (2001). Aquatic toxicity from pulp and paper mill effluents: a review. Adv. Environ. Res. 5(2): 175–196, https://doi.org/10.1016/s1093-0191(00)00055-1.

    • Crossref
    • Export Citation
  • Audet, A., Mishra, S.P., Sherson, G., and Earl, P.F. (2014). Mill implementation of the near-neutral chlorine dioxide brightening technology. International Pulp Bleaching Conference, Grenoble.

  • Björklund, M., Germgård, U., Jour, P., Forsström, A., 2002. AOX formation in ECF bleaching at different kappa numbers – influence of oxygen delignification and hexenuronic acid content. Tappi J. 1 (7), 20–24. https://imisrise.tappi.org/TAPPI/Products/02/SEP/02SEP20.aspx.

  • Chakar, F.S., Allison, L., Ragauskas, A., McDonough, T., Sezgi, U., 2000. Influence of hexenuronic acids on U.S. bleaching operations. Tappi J. 83 (11), 62. https://imisrise.tappi.org/TAPPI/Products/00/NOV/00NOV62.aspx.

  • Dence, W.C. and Reeve, W.D. (1996). Pulp bleaching - principles and practice. Tappi Press, Atlanta.

  • European Committee for Standardization, 2005. EN ISO 9562:2005 Water quality – Determination of adsorbable organically bound halogens (AOX). CEN.

  • Fiskari, J., Kakkonen, A., Hannu, P., and Alen, R. (2016). A comparative study of advanced oxidative processes. Degradation of chlorinated organic compounds in ultrafiltration fractions of kraft pulp bleaching effluent. Environ. Protect. Eng. 42(4): 151–159, https://doi.org/10.37190/160412.

  • Granström, A., Eriksson, T., Gellerstedt, G., Rööst, C., and Larsson, P. (2001). Variables affecting the thermal yellowing of TCF-bleached birch kraft pulps. Nord. Pulp Pap. Res. J. 16(1): 18–23, https://doi.org/10.3183/npprj-2001-16-01-p018-023.

    • Crossref
    • Export Citation
  • Hart, P., Connell, D., 2008. Improving chlorine dioxide bleaching efficiency by selecting the optimum pH targets. Tappi J. 7 (3), 3–11. https://imisrise.tappi.org/TAPPI/Products/08/JUL/08JUL03.aspx.

  • International Organization for Standardization, 2016. ISO 2470-1:2016 Paper, board and pulps – Measurement of diffuse blue reflectance factor (ISO brightness). ISO.

  • International Organization for Standardization, 1999. ISO 3688:1999 Pulps – Preparation for the measurement of diffuse blue reflectance factor. ISO.

  • International Organization for Standardization, 2010. ISO 5351:2010 Pulps - Determination of limiting viscosity number in cupri-ethylenediamine (CED) soultion. ISO.

  • International Organization for Standardization, 2015. ISO 302:2015 Pulps — Determination of Kappa number. ISO.

  • Jiang, Z.H., Berry, R., 2011. Near-neutral final chlorine dioxide brightening: theory and practise. J-For. 1 (1), 14–20. doi:http://www.paptac.ca/J-FOR/J-FOR%20Vol%201-No%201.pdf.

  • Katz, S., Beatson, R., and Scallan, A. (1984). The determination of strong and weak acidic groups in sulfite pulps. Sven. Papperstidning, Nord. Cellul. 87(6): 48–53.

  • Lewin, M. and Epstein, J.A. (1962). Functional groups and degradation of cotton oxidized by hypochlorite. J. Polym. Sci. 58: 1023–1037, https://doi.org/10.1002/pol.1962.1205816663.

    • Crossref
    • Export Citation
  • Li, J. and Gellerstedt, G. (1998). On the structural significance of the kappa number measurement. Nord. Pulp Pap Res. J. 13(2): 153–158, https://doi.org/10.3183/npprj-1998-13-02-p153-158.

    • Crossref
    • Export Citation
  • Ni, Y., Kubes, G.J., and van Heiningen, A.R.P. (1991). Rate processes of AOX formation and chlorine species distribution during ClO2 prebleaching of kraft pulp. In, International pulp bleaching conference, Stockholm, pp. 195–218.

  • Radiotis, T., Audet, A., and Lee, C.L. (2018). Implementation of the near-neutral ClO2 brightening technology at Domtar Johnsonburg Mill. PEERS, Portland.

  • Ribeiro, R.A., Gomes, F.J.B., Floriani, J.N., Damásio, R.A.P., Demuner, I.F., and Colodette, J.L. (2014). Final chlorine dioxide stage at near-neutral pH for bleaching eucalyptus pulp. Quim. Nova. 37(10): 1646–1649, https://doi.org/10.5935/0100-4042.20140251.

  • Rydholm, S.A. (1965). Pulping processes. Interscience Publishers, New York.

  • Savant, D.V., Abdul-Raman, R., and Ranade, D.R. (2006). Anaerobic degradation of adsorbable organic halides (AOX) from pulp and paper industry wastewater. Bioresour. Technol. 97: 1092–1104, https://doi.org/10.1016/j.biortech.2004.12.013.

    • Crossref
    • PubMed
    • Export Citation
  • Sevastyanova, O., Forsström, A., Wackerberg, E., Lindström, M.E., 2012. Bleaching of eucalyptus kraft pulps with chlorine dioxide: factors affecting the efficiency of the final D stage. Tappi J. 11 (3), 43–53. https://doi.org/10.32964/tj11.3.43.

    • Crossref
    • Export Citation
  • Technical Association of the Pulp and Paper Industry, 2007. T 611 cm-07 Analysis of bleaching powder, calcium hypochlorite bleach liquor, and bleach sludge. [TAPPI].

  • Törngren, A. and Ragnar, M. (2002). Hexenuronic acid reactions in chlorine dioxide bleaching – aspects on in situ formation of molecular chlorine. Nord. Pulp Pap Res. J. 17(2): 179–182, https://doi.org/10.3183/npprj-2002-17-02-p179-182.

    • Crossref
    • Export Citation
  • Vuorinen, T., Fagerström, P., Buchert, J., Tenkanen, M., and Teleman, A. (1999). Selective hydrolysis of hexenuronic acid groups and its application in ECF and TCF bleaching of kraft pulps. J. Pulp Pap. Sci. 25(5): 155–162.

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