ارزيابي اثر پيش تيمار قارچي روي ويژگي هاي خمير كاغذ سوداي بدست آمده از ساقه كلزا

Effect of Fungal Pre-treatment on Soda Pulp Properties of Canola Residues

Canola straw as an agricultural residue was investigated for pulp production by soda process in two stages. In the first stage the variables were the active alkaline contents of 18, 20, 24, 26 and 28 %, and cooking times of 60, 120 and 140 min. The temperature was kept constant at 170 C. In the second stage a biotechnological method was applied as pre-treatment by Trametes versicolor fungi to produce pulp from canola straw at active alkaline contents of 24, 26 and 28% (as selected treatments from the first stage) at the cooking time of 140 min. Control and pretreatment samples were bleached with ECF method and by using Chlorine dioxide. The results showed that fungal pretreatment reduced the Kappa number and yield of the pulp around 25% and 20% in comparison with the controls, respectively. The results of measuring the pulp brightness showed that the fungal pretreatment reduced the Chlorine dioxide consumption and increased brightness around 8% at active alkaline of 28%. Finally, it was concluded that the best treatment with minimum Kappa number and yield was obtained with fungal pre-treatment at 28% active alkaline and 140 min cooking time. Meanwhile, maximum Kappa number and yield were obtained at 18% active alkaline and 60 min cooking time. Keywords: Canola straw, Soda pulping, ECF bleaching, Chlorine dioxide, Kappa number, Brightness, Trametes versicolor