【摘要】 以厨余垃圾为原料,在小型反应器中进行32d的高温堆肥,探究电场辅助好氧堆肥中胞外聚合物的变化.结果表明,电场显著加快有机质的生物转化,在堆肥初期增加23.1%的挥发性脂肪酸和40.8%的还原糖含量.与对照组相比,电场组的类富里酸和类胡敏酸物质分别提高了91.4%和82.7%.此外,相关性分析表明堆肥期间胞外聚合物变化和有机物转化有显著相关性.首先胞外聚合物的蛋白质成分可能加速电子和氧气的接触,促进有机物的降解,同时其多糖和蛋白质成分可以作为腐殖质前体参与腐殖化过程.而电场促进了堆肥过程中胞外聚合物的分泌,因此胞外聚合物变化可能是电场强化好氧堆肥有机物降解的潜在机制.本文为电场辅助好氧堆肥调控腐殖化过程提供新思路.更多还原

【Abstract】 The composting trial was conducted with food waste in a small reactor for 32 days to investigate the alterations in extracellular polymers during electric field-assisted aerobic composting. The findings demonstrated that the electric field significantly expedited the biological transformation of organic matter, resulting in 23.1% and 40.8% increases in volatile fatty acids and reducing sugars during the initial stages of composting, respectively. Compared with the control group, the electric field group exhibited a notable increase of 91.4% in fulvic acid-like substances and 82.7% in humic acid-like substances, respectively.Additionally, correlation analysis revealed a significant association between changes in extracellular polymers and the conversion of organic matter. Primarily, protein components within extracellular polymers were identified as potential catalysts for facilitating the interaction between electrons and oxygen, thereby promoting the degradation of organic matter. Simultaneously, the polysaccharide and protein components served as precursors for humus formation, contributing to the humification process. Moreover, the application of an electric field stimulated the secretion of extracellular polymers, suggesting that these polymers could serve as a potential mechanism for enhancing organic matter degradation during electric field-assisted aerobic composting. This study presents a novel approach for regulating the humification process in electric field-assisted aerobic composting.更多还原