| Wet Oxidation Pretreatment of Poplar Waste for Enhancing Enzymatic Hydrolysis Efficiency |
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| Author Name | Affiliation | | GuiGan Fang1,2,3 | 1. Institute of Chemical Industry of Forestry Products, CAF
National Engineering Lab for Biomass Chemical Utilization
Key Lab of Forest Chemical Engineering, SFA
Key Lab of Biomass Energy and Material of Jiangsu, Nanjing, Jiangsu Province, 210042, China
2. Institute of New Technology of Forestry, CAF, Beijing, 100091, China
3. Collaboration Innovation Center for High Efficient Processing and Utilization of Forestry Resources, Nanjing Forestry University, Nanjing, Jiangsu Province, 210037, China | | ShanShan Liu4 | 4. Qilu University of Technology, Ji’an, Shandong Province, 250353, China | | KuiZhong Shen1,2 | 1. Institute of Chemical Industry of Forestry Products, CAF
National Engineering Lab for Biomass Chemical Utilization
Key Lab of Forest Chemical Engineering, SFA
Key Lab of Biomass Energy and Material of Jiangsu, Nanjing, Jiangsu Province, 210042, China
2. Institute of New Technology of Forestry, CAF, Beijing, 100091, China | | Yan Lin1 | 1. Institute of Chemical Industry of Forestry Products, CAF
National Engineering Lab for Biomass Chemical Utilization
Key Lab of Forest Chemical Engineering, SFA
Key Lab of Biomass Energy and Material of Jiangsu, Nanjing, Jiangsu Province, 210042, China |
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| Fund Project:The authors are grateful for the financial support of the Twelfth Five-Year National Science and Technology Support Program (2014BAD02B02). |
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| Abstract:In this paper, we described the optimization of the wet oxidation pretreatment conditions to enhance enzymatic hydrolysis efficiency, using poplar waste from the stock section of a paper mill as the raw material. We showed that the optimal conditions of the pretreatment for poplar waste were an initial pH value of 10, a temperature of 195℃, a holding time of 15 min, and an oxygen pressure of 1.2 MPa. In this case, the yield of the obtained solid material produced by the process was 51.7% and the reducing sugar yield was 46.8%. The solid part obtained from the pretreatment process was hydrolyzed by cellulase L-10. The optimal enzymatic conditions were a temperature of 49℃, a duration time of 56 h, an enzyme dosage of 38 FPU/g at a pH value of 4.8, and a solid-to-liquor ratio of 1∶50. The resulting cellulose conversion rate reached 96.4% in terms of the pretreated substances. In addition, a chemical composition analysis of the poplar waste and pretreated material indicated that about 92% of the hemicelluloses and 43% of the lignin in the raw material were degraded and dissolved. In addition, the crystallization decreased from 57.5% to 54.8%. An obvious fibrillation of the fiber pretreated by the wet oxidization process was observed by SEM. Moreover, high-performance liquid chromatography (HPLC) results showed a high xylose content and monosaccharide degradation products in the pretreatment solution. In conclusion, the wet oxidation pretreatment process could efficiently degrade or remove the lignin and hemicellulose, as well as reduce the crystallinity of the lignocellulosic material, which resulted in an improvement of the enzymatic ability and an increase in the cellulose conversion rate. |
| keywords:poplar waste wet oxidation pretreatment enzymatic hydrolysis efficiency cellulase hydrolysis |
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