بررسي تاثير پالايش در عملكرد آنزيم سلولاز بر خواص خمير OCC

Investigating the effect of refining on cellulase enzyme activity on the properties of OCC pulp

از آﻧﺠﺎ ﮐﻪ ﻣﺼﺮف ﺧﻤﯿﺮﮐﺎﻏﺬ OCCدر دﻧﯿﺎ در ﺣﺎل اﻓﺰاﯾﺶ اﺳﺖ، ﻻزم اﺳﺖ ﻣﻄﺎﻟﻌﺎت ﮐﺎرﺑﺮدي در ﺧﺼﻮص ﮐﺎﻫﺶ ﻣﺼﺮف اﻧﺮژي و ﺑﻬﺒﻮد ﮐﯿﻔﯿﺖ اﯾﻦ ﻧﻮع ﺧﻤﯿﺮﮐﺎﻏﺬ و ﺑﺎ اﺳﺘﻔﺎده از ﺗﯿﻤﺎرﻫﺎي آﻧﺰﯾﻤﯽ اﻧﺠﺎم ﭘﺬﯾﺮد. در اﯾﻦ ﺗﺤﻘﯿﻖ ﺗﺄﺛﯿﺮ ﭘﺎﻻﯾﺶ در ﻋﻤﻠﮑﺮد آﻧﺰﯾﻢ ﺳﻠﻮﻻز ﺑﺮ وﯾﮋﮔﯽﻫﺎي ﺧﻤﯿﺮﮐﺎﻏﺬ OCC ﻣﻮرد ﺑﺮرﺳﯽ ﻗﺮار ﮔﺮﻓﺖ. ﺧﻤﯿﺮﮐﺎﻏﺬ OCC ﺑﺎ درﺻﺪ ﺧﺸﮑﯽ 4 درﺻﺪ، در ﺷﺮاﯾﻂ ﺛﺎﺑﺖ درﺟﻪ ﺣﺮارت 50 درﺟﻪ-ﺳﺎﻧﺘﯿﮕﺮاد، ﻣﺪت زﻣﺎن 1 ﺳﺎﻋﺖ و ﻣﺤﺪوده 4-4/5:pH ﺑﺎ آﻧﺰﯾﻢ ﺳﻠﻮﻻز در ﺳﻪ ﺳﻄﺢ 0/5 ،0/3 ،0/1 درﺻﺪ) ﺑﺮ اﺳﺎس وزن ﺧﺸﮏ ﺧﻤﯿﺮﮐﺎﻏﺬ( ﭘﯿﺶﺗﯿﻤﺎر ﺷﺪﻧﺪ. درﺟﻪرواﻧﯽ و وﯾﮋﮔﯽﻫﺎي ﻣﻘﺎوﻣﺘﯽ ﮐﺎﻏﺬ ﺑﺮ اﺳﺎس آﺋﯿﻦﻧﺎﻣﻪﻫﺎي اﺳﺘﺎﻧﺪارد TAPPIاﻧﺪازهﮔﯿﺮي ﺷﺪ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن داد ﮐﻪ ﺗﯿﻤﺎر آﻧﺰﯾﻤﯽ ﺳﻠﻮﻻز ﺑﺎﻋﺚ اﻓﺰاﯾﺶ درﺟﻪرواﻧﯽ ﺧﻤﯿﺮ و ﺑﻬﺒﻮد وﯾﮋﮔﯽﻫﺎي ﻣﻘﺎوﻣﺘﯽ ﮐﺎﻏﺬﻫﺎ ﺷﺪه و اﯾﻦ ﺗﺄﺛﯿﺮ، در ﺧﻤﯿﺮﻫﺎي OCC ﭘﺎﻻﯾﺶﻧﺸﺪه ﺑﯿﺸﺘﺮ از ﺧﻤﯿﺮﻫﺎي OCC ﭘﺎﻻﯾﺶﺷﺪه ، ﺑﻮده اﺳﺖ. در ﻣﺠﻤﻮع ﺑﺎ ﺗﯿﻤﺎر آﻧﺰﯾﻤﯽ ﺳﻠﻮﻻز ﻣﯽ ﺗﻮان ﻧﺴﺒﺖ ﺑﻪ ﮐﺎﻫﺶ ﭘﺎﻻﯾﺶ ﺧﻤﯿﺮ و ﮐﺎﻫﺶ ﻣﺼﺮف اﻧﺮژي و ﺑﻬﺒﻮد ﮐﯿﻔﯿﺖ ﺧﻤﯿﺮﮐﺎﻏﺬ OCC اﻗﺪام ﻧﻤﻮد.

As the consumption of OCC pulp is increasing globally, practical studies are needed to reduce energy consumption and improve the quality of this pulp using enzymatic treatments. In this study, the effect of refining on cellulase enzyme performance on OCC pulp properties was investigated. OCC pulp with 4% consistency, 50 ° C constant temperature, 1 hour duration and 4-5.5: pH with cellulase enzyme at three levels of 0.1, 0.3, 0.5 percentages (based on dry weight of pulp) were pretreated. Pulp freeness and hand sheet strength properties were measured according to TAPPI standard codes. The results showed that the enzymatic treatment of cellulase increased pulp freeness and improved paper strength properties and this effect was more in unrefined OCC pulps than refined OCC pulps. Overall, enzymatic cellulase treatment can reduce pulp refining and reduce energy consumption and improve OCC pulp quality.