Improved biobleaching of mixed hardwood pulp and process optimization using novel GA-ANN and GA-ANFIS hybrid statistical tools

• Published in: Bioresource technology 2019-01, Vol.271, p.274-282
• Main Authors: Kumar, Vishal, Kumar, Ashwani, Chhabra, Deepak, Shukla, Pratyoosh
• Format: Article
• Language: English
• Subjects: Biobleaching; Carbohydrate Metabolism; Carbohydrates; Endo-1,4-beta Xylanases; Hybrid statistical tools; Lignin - chemistry; Lignin - metabolism; Paper and pulp; Thermomyces lanuginosus; Wood - metabolism; Xylanase
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2018.09.115

[Display omitted] •Xylanase biobleaching process was optimized using OFAT approach.•Reducing sugar yield after OFAT optimization was reported 21.99 mg g−1.•GA-ANN and GA-ANFIS resulted increased reducing sugar yield 28.16 mg g−1 (28.2%).•Biobleaching of pulp raised brightness, reduce lignin content and kappa number.•Xylanase proves its industrial applicability for biobleaching of paper and pulp. The process parameters for xylanase biobleaching of mixed hardwood pulp like, reaction time (6–35 h), pulp consistency (2.5–15%) and xylanase dose (5–35 U) were optimized using OFAT approach and hybrid statistical tools viz. GA-ANN and GA-ANFIS. The biobleaching ability of xylanase in terms of reducing sugar yield increased up to 28.16 mg g−1 (28.05%) than OFAT optimization (21.99 mg g−1 of pulp) after employing hybrid statistical tools. After TCF bleaching of xylanase treated pulp, we observed that lignin content reduced to 0.29% whereas it was still 0.41% in the untreated pulp. Moreover, the brightness level achieved up to 70.4% in xylanase treated pulp while it was only 53.60% in the chemically treated pulp. The kappa number for xylanase treated, chemically treated, and xylanase-chemical treated pulp was recorded 9.90, 7.10 and 4.70, respectively. The present study reports an improved eco-friendly biobleaching method using novel GA-ANN and GA-ANFIS hybrid statistical tools.