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Potential Hydrothermal-Humification of Vegetable Wastes by Steam Explosion and Structural Characteristics of Humified Fractions

文献类型： 外文期刊

作者： Sui, Wenjie 1 ; Li, Shunqin 1 ; Zhou, Xiaodan 1 ; Dou, Zishan 1 ; Liu, Rui 1 ; Wu, Tao 1 ; Jia, Hongyu 2 ; Wang, Guanhua; 1 ;

作者机构： 1.Tianjin Univ Sci Technol, Coll Food Sci & Engn, State Key Lab Food Nutr & Safety, Tianjin 300457, Peoples R China

2.Shandong Acad Agr Sci, Inst Agr Resources & Environm, Jinan 250132, Peoples R China

3.Tianjin Univ Sci & Technol, Coll Light Ind Sci & Engn, Tianjin Key Lab Pulp & Paper, Tianjin 300457, Peoples R China

4.Tianjin Agr Univ, Coll Food Sci & Bioengn, Tianjin 300392, Peoples R China

关键词： steam explosion; humification; vegetable wastes; structural characteristics; humic acids; hydrothermal treatment

期刊名称：MOLECULES （ 影响因子：4.412； 五年影响因子：4.588 ）

ISSN：

年卷期： 2021 年 26 卷 13 期

页码：

收录情况： SCI

摘要： In this work, steam explosion (SE) was exploited as a potential hydrothermal-humification process of vegetable wastes to deconstruct their structure and accelerate their decomposition to prepare humified substances. Results indicated that the SE process led to the removal of hemicellulose, re-condensation of lignin, degradation of the cellulosic amorphous region, and the enhancement of thermal stability of broccoli wastes, which provided transformable substrates and a thermal-acidic reaction environment for humification. After SE treatment, total humic substances (HS), humic acids (HA(s)), and fulvic acids (FA(s)) contents of broccoli samples accounted for up to 198.3 g/kg, 42.3 g/kg, and 166.6 g/kg, and their purification were also facilitated. With the increment of SE severity, structural characteristics of HA(s) presented the loss of aliphatic compounds, carbohydrates, and carboxylic acids and the enrichment of aromatic structures and N-containing groups. Lignin substructures were proved to be the predominant aromatic structures and gluconoxylans were the main carbohydrates associated with lignin in HA(s), both of their signals were enhanced by SE. Above results suggested that SE could promote the decomposition of easily biodegradable matters and further polycondensation, aromatization, and nitrogen-fixation reactions during humification, which were conducive to the formation of HA(s).

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