Journal of Korea Technical Association of The Pulp and Paper Industry (펄프종이기술)

Korea Technical Association of the Pulp and Paper Industry (한국펄프종이공학회)
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Study on the Detachment of Fluorescent Whitening Agents from White Waster Papers

인쇄용지 재활용을 위한 형광증백제 탈착에 대한 기초연구

  • Lee, Ji Young (Dept. of Environmental Materials Science / IALS, Gyeongsang National University) ;
  • Kim, Chul Hwan (Dept. of Environmental Materials Science / IALS, Gyeongsang National University) ;
  • Kim, Eun Hea (Dept. of Forest Products, Gyeongsang National University) ;
  • Park, Tae Ung (Dept. of Environmental Materials Science, Gyeongsang National University)
  • 이지영 (경상대학교 환경재료과학과/농업생명과학연구원) ;
  • 김철환 (경상대학교 환경재료과학과/농업생명과학연구원) ;
  • 김은혜 (경상대학교 임산공학과) ;
  • 박태웅 (경상대학교 환경재료과학과)
  • Received : 2016.03.18
  • Accepted : 2016.04.04
  • Published : 2016.04.30
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Abstract

White waste papers are very important resources in the paper industry, but their use is limited because of the residual of fluorescent whitening agent (FWA). So the removal of FWAs from waste paper is an important task in the recycling process to improve the use of recycled resources. In this study, we focused on the FWAs used for surface treatments and carried out physical and chemical treatments to remove them from white waste papers. The white waste papers were disintegrated with a surfactant in different pH and temperature conditions, and then handsheets were made for the measurement of the fluorescence index, which is proportional to the amount of FWAs on papers. The effect of the flotation process on the removal of FWAs after disintegration was also investigated. The fluorescence index decreased as the disintegration time increased, but over a relatively long time, the fluorescence index increased again, which indicated the readsorption of the FWAs detached from the cellulosic fibers of the white waste papers. The lowest fluorescence index was shown when the waste papers were disintegrated with a 0.3% surfactant addition at pH 10 and at $45^{\circ}C$. However, the flotation treatment was not effective, because the flotation induced contact between the detached FWAs and the cellulosic fibers, and re-adsorption occurred.

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References

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