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| Research on the Removal of Lignin from Corn Stalk Hydrolysate Using Thermal Coagulation of Soymilk |
| Received:January 25, 2025 |
| DOI：10.11980/j.issn.0254-508X.2025.06.008 |
| Key Words:corn stalk hydrolysate biodegradability soymilk flocculation process |
| Author Name | Affiliation | Postcode | | YANG Yuxin* | Tianjin Key Lab of Pulp and Paper Industry, Tianjin University of Science and Technology, Tianjin, 300457 | 300457 | | QI Jian | Tianjin Port Xingyang Machinery Co., Ltd., Tianjin, 300452 | 300452 | | LYU Pengjing | Tianjin Key Lab of Pulp and Paper Industry, Tianjin University of Science and Technology, Tianjin, 300457 | 300457 | | CHEN Yanbing | Tianjin Key Lab of Pulp and Paper Industry, Tianjin University of Science and Technology, Tianjin, 300457 | 300457 | | SUN Yuru | Tianjin Key Lab of Pulp and Paper Industry, Tianjin University of Science and Technology, Tianjin, 300457 | 300457 | | DU Peiqing | Tianjin Port Xingyang Machinery Co., Ltd., Tianjin, 300452 | 300452 | | HUANG Jinda | Tianjin Port Xingyang Machinery Co., Ltd., Tianjin, 300452 | 300452 | | CHEN Yan | Beijing Keyin Media and Culture Co., Ltd., Beijing, 100036 | 100036 | | ZHU Yong | Sinolight Paper Inspection and Certification Co., Ltd., Beijing, 100102 | 100102 | | LIU Chunlan | Shandong Kemai Bio-mechanical Pulp Co., Ltd., Weifang, Shandong Province, 262400 | 262400 | | LI Min | Zhuhai Hongta Renheng Packaging Co., Ltd., Zhuhai, Guangdong Province, 519000 | 519000 | | YU Menghui* | Tianjin Key Lab of Pulp and Paper Industry, Tianjin University of Science and Technology, Tianjin, 300457 | 300457 | | WANG Gaosheng | Tianjin Key Lab of Pulp and Paper Industry, Tianjin University of Science and Technology, Tianjin, 300457 | 300457 |
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| Abstract:This study investigated the impact of high-temperature thermal soymilk （Soymilk-TC） flocculation process on lignin removal from corn stalk hydrolysate and elucidated its reaction mechanism， aming to enhance the biochemical characteristics of the hydrolysate. The results showed that the Soymilk-TC flocculation process effectively removed 85.38% of colloidal lignin and 28.14% of dissolved lignin from the hydrolysate， outperforming the Cationic polyacrylamide and Polyaluminium chloride coagulation methods. By analyzing the chemical structure， surface charge， surface hydrophobicity， free thiol content， etc. of soymilk before and after heat treatment， the thermodynamic changed of protein and lignin and the self-flocculation process of protein in the Soymilk-TC flocculation process were quantitatively analyzed. The results showed that high temperature causes denaturation of soy protein in soymilk and enhanced the surface hydrophobicity of soymilk. It promoted the combination of soymilk and lignin through hydrophobic reaction. Meanwhile， the thiol-disulfide bond reaction promoted the formation of macromolecular aggregates of soymilk molecules combined with lignin， facilitating their separation from the hydrolysate of corn stalks. The biodegradability of the hydrolysate was significantly enhanced by the Soymilk-TC flocculation process， resulting in increases of 207.65% in biogas yield and 34.32% in biogas production rate. |
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