Sugar Tech

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Evaluation of Soda Delignification and Single-Stage Hydrogen Peroxide Bleaching for the Ethiopian Sugarcane Bagasse for Paper Production

  • Medhanit MamayeEmail author
  • Zebene Kiflie
  • Sisay Feleke
  • Abubeker Yimam
Research Article


The present study investigated the Ethiopian sugarcane bagasse during its delignification via the sulfur-free soda pulping process and bleaching by the single-stage hydrogen peroxide process. The multilevel categoric experimental design was used to assess the effects of the three independent process variables (pulping temperature, NaOH concentration and time) on the pulp yield and kappa number, during the soda pulping process. The effect of the independent bleaching variables (bleaching temperature, time and H2O2 concentration) on the pulp yield, brightness and whiteness was assessed by using the response surface methodology (central composite experimental design). The soda pulps from the Ethiopian sugarcane bagasse were of varying yield and kappa number and hence were classified according to the sugarcane bagasse providing the highest pulp yield (pulp-SA) with 88.07% and that providing the lowest pulp yield (pulp-SB) with 85.17%. Their corresponding kappa numbers were 16.73 and 8.27, respectively. The brightness and whiteness for the pulp-SA were 62.02% and 84.43%, respectively, whereas for the pulp-SB, the corresponding values were 71.86% and 90.47%, respectively. The study further shows that the paper produced from the pulp-SA had higher mechanical properties. Thus, the promising valorization of the Ethiopian sugarcane bagasse for paper production using the adopted methodology, namely the soda pulping and single-stage hydrogen peroxide bleaching routes, is validated.

Graphic Abstract


Sugarcane bagasse Hydrogen peroxide bleaching Soda pulping Kappa number Brightness Whiteness 



The first author is very grateful to Addis Ababa Institute of Technology, Addis Ababa University, Hawassa Institute of Technology, Bahir Dar Institute of Technology, Wood Technology Research Center of the Ethiopian Environment and Forest Research Institute for the laboratory supports.


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Copyright information

© Society for Sugar Research & Promotion 2020

Authors and Affiliations

  • Medhanit Mamaye
    • 1
    Email author
  • Zebene Kiflie
    • 1
  • Sisay Feleke
    • 2
  • Abubeker Yimam
    • 1
  1. 1.Process Engineering Division, School of Chemical and Bio Engineering, Addis Ababa Institute of TechnologyAddis Ababa UniversityAddis AbabaEthiopia
  2. 2.Ethiopian Agricultural Research Council SecretariatAddis AbabaEthiopia

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