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The effect of different charges of sodium dithionite and bleaching times on the optical and mechanical properties and COD of bleached recycled mixed ONP and OMG pulps

Hamid reza Mehri Iraie; Ali Ghasemian; Hossein Resalati; Ahmad reza Saraeyan; Iman Akbarpour

Volume 29, Fall 3 , November 2014, , Pages 411-421

https://doi.org/10.22092/ijwpr.2014.6212

Abstract
  This research was conducted to investigate the bleaching of combined old newspapers (ONP) and old magazines (OMG) deinked pulp using sodium dithionite. The pulp was bleached using 0.5, 0.75, and 1% sodium dithionite and different times of 30, 60 and 90 minutes. The pulps were then refined to 300 ml, ...  Read More

Comparison of hot water and alkaline pre-treatments on the properties of wheat straw NSSC pulp

Soodeh Zhand; Masih Masoudifar; Ahmad reza Saraeian; Ali Ghasemian

Volume 28, Issue 4 , January 2014, , Pages 774-794

https://doi.org/10.22092/ijwpr.2014.4467

Abstract
  The purpose of this study was to compare the properties of wheat straw (Zagros sp) collected in Golestan province NSSC pulp under alkaline pretreatment with 1% sodium hydroxide and boiling pretreatment. Wheat Straw pretreatment with 1% sodium hydroxide and hot water at water to straw ration of 10 to ...  Read More