Enzymatic Deinking of Old Newspaper with Cellulase and Lipase

Document Type : Research Note

Authors

Department of Wood and Paper Sciences and Technology, Faculty of Natural Resources Engineering, Science & Research Branch, Islamic Azad University, Tehran, I.R. IRAN

Abstract

Biotechnical methods have the potential to offer significant improvements for traditional pulp and paper manufacturing processes due to their specificity and possible environmental advantages. Current deinking processes use large amounts of expensive, potentially environmentally damaging chemical which makes the method expensive and highly environmentally damaging. The use of enzymes could be an attractive alternative to chemicals in deinking. This research was carried out to study the influence of enzymatic deinking on optical properties and mechanical strengths of old newspaper deinked pulps. In order to perform this research, we did pulping operation with cellulase and lipase enzyme, in 4% consistency for 2.5 minutes in neutral PH, in two temperatures of 20 °C and 50 °C. After we made the pulps, we started deinking process by washing on the sieve having 120 meshes. Following this, we did statistical analyses the effect of enzymatic andtemperature treatment on optical properties and mechanical strengths of shandsheets. Results got from measuring optical properties showed that enzymatic deinking of papers leads to brightness promotion and reduces the dirt count and dirt area of handsheets. The highest brightness level and lowest dirt count and dirt area were observed in repaired samples having cellulase in 50 °C. For handsheets made from control pulp the values of folding endurance, TEA, elongation, brightness, dirt count and dirt area were 3, 34.625 J/m2, 1.74 %, 42.46 %, 51 and 1.008 mm2, respectively. On the contrary, for enzyme treated pulps the optimum values of folding endurance, TEA, elongation, brightness, dirt count and dirt area were 4, 51.54 J/m2, 2.03 %, 43.91 %, 15 and 0.245 mm2, respectively. This investigation showed that enzymatic deinking can be a suitable alternative instead of current deinking in paper recycling industries.  

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References

[1] مایلی، نادر؛ طلایی پور، محمد؛ جوهرزدایی آنزیمی مخلوط کاغذ باطله اداری در محیط خنثی، نخستین همایش ملی فن آوری های نوین در صنایع چوب و کاغذ، دانشگاه آزاد اسلامی، واحد چالوس، (1389).
[2] Pala H., Mota M., Gama F.M., Factors Influencing MOW Deinking: Laboratory Scale Studies, Enzyme Microb Technol J, 38, p. 81 (2006).
[3] Jeffries T., Sykes M., Rutledge-Cropsey K., Klungness J., Abubakr S., Enhanced Removal of Toners from Office Waste Papers by Microbial Cellulases, "Proceedings of the 6th International Conference on Biotechnology in the Pulp and Paper Industry", Advanced in Applied and Fundamental Research (1998).
[4] Pèlach M., Pastor F., Puig J., Vilaseca F., Mutjè, P., Enzymic Deinking of Old Newspapers with Cellulose,  Process Biochem J, 38, p. 1063 (2006).
[5] Mørkbak A., Degn P., Zimmermann W., Deinking of Soy Bean Oil Based Ink Printed Paper with Lipases and a Neutral Surfactant, Biotechnol J., 67, p. 229 (1999).
[6] Sykes M., Klungness J., Tan F., Abubakr S., Enzymatic Removal of Stickie Contaminants, "TAPPI Pulping Conference Proceedings", p. 687 (1997).
[7] Rutledge-Cropsey K., Klungness J., Abubakr S., Performance of Enzymatically Deinked Recovered Paper on Paper Machine Runnability, Tappi J, 81(2), p. 148 (1998).
[8] Sykes M., Tan F., "Enzymatic Removal of Stickie Contaminants", TAPPI Pulping Conference Proceedings, p. 687 (1997).
[9] Sykes M., Klungness J., Abubakr S., Tan F., Upgrading Recovered Ppaper with Enzyme Pretreatment and Pressurized Peroxide Bleaching, Prog Paper Recycl , p. 39 (1996).
[10] Jeffries TW., Sykes M., Rutledge-Cropsey K., Klungness J., Abubakr S., Enhanced Removal of Toners from Office Waste Papers by Microbial Cellulases, "In: Sixth International Conference on Biotech, Pulp and Paper Industry", p. 141 (1995).
[11] Pala H., Mota M., Gama F., Enzymatic Versus Chemical Deinking of Non-Impact Ink Printed Paper, Biotechnol J, 108(1), p. 79 (2004).
[12] Kim T., Ow S., Eom T., Enzymatic Deinking Method of Wastepaper, "In: TAPPI Pulping Conference Proceedings",p. 1023 (1991).
[13] مایلی، نادر؛ تاثیر HLB و دما بر جوهرزدایی آنزیمی کاغذ روزنامه، مجله و باطله اداری، پایان نامه کارشناسی ارشد، دانشکده منابع طبیعی، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران، (1388).
[14] Bajpai P., Application of Enzymes in the Pulp and Paper industry, Biotechnol. Prog, 15, p. 147 (1999).

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