The effect of bleaching reagents on bleachabilities of DIP and environmental loads

Chi-Deuk Ahn; Jung-Yoon Park; Sung-Jun Hwang; Seok-Jun Hong; Jin-Hee Lee; Hyoung-Jin Kim; Sung-Hyun Chung

doi:10.7584/ktappi.2015.47.1.066

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The effect of bleaching reagents on bleachabilities of DIP and environmental loads 탈묵펄프용 표백약품에 따른 표백 특성 및 표백폐수의 환경부하 영향

28 February 2015. pp. 66-74

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Abstract

DIP(deinked pulp) was bleached by FAS, Na₂S₂O₄ and H₂O₂, which are widely used in DIP bleaching process, in order to improve optical properties of DIP, and the bleaching efficiencies of DIP and environmental loads of waste water were compared, depending on bleaching chemical dosages. With the application of different bleaching chemicals, some positive improvements were shown in optical and physical properties of bleached pulp. However, the physical properties of bleached DIP and their characteristics of wastewater were remarkably different, depending on dosages and bleaching reagents. DIP chemicals with FAS and Na₂S₂O₄ have higher improvement in optical and physical properties than H₂O₂. Also, environmental loads such as pH, turbidity, SCODcr and cationic demand were decreased in reductive bleaching process. Despite of higher effectiveness of reductive bleaching process, there were some environmental problems caused by sulfur ions from FAS and Na₂S₂O₄. With the method of sulfur ion controls, it would be more effective than H₂O₂ bleaching process.

Keywords

formamidine sulfinic acid

sodium dithionite

hydrogen peroxide

bleachability

environmental loads

deinked pulp

References

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Information

Publisher :Korea Technical Association of The Pulp and Paper Industry
Publisher(Ko) :한국펄프종이공학회
Journal Title :Journal of Korea TAPPI
Journal Title(Ko) :펄프종이기술
Volume : 47
No :1
Pages :66-74
Received Date : 2015-02-11
Revised Date : 2015-02-17
Accepted Date : 2015-02-23
DOI :https://doi.org/10.7584/ktappi.2015.47.1.066

Journal of Korea TAPPI ISSN:0253-3200(Print) 펄프종이기술

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Literature Cited