Wang Feng, Yao Wu, Zhang Weiwen, Miao Lijuan, Wang Yifan, Zhang Hangjun, Ding Ying, Zhu Weiqin
Key Laboratory of Hangzhou City for Ecosystem Protection and Restoration, Hangzhou Normal University, Hangzhou, China.
Waste Manag Res. 2022 Jun;40(6):736-744. doi: 10.1177/0734242X211035943. Epub 2021 Jul 31.
Aiming to reveal the humification process of organic waste and its contribution to the heavy metal behaviour affected by earthworm activity, it was studied about the variation of humic acid (HA) and heavy metal behaviour during vermicomposting of the mixed pig manure and C-labelled rice straw. The results showed that earthworms could well adapt to the culturing environment and feed organic matter for its growth and reproduction, the vermicomposting process increased the content of humic substances (HS), HA, and fulvic acid (FA) in substrate residues, but led to less transformation of HA into FA. The elemental, ultraviolet absorption spectroscopy, Fourier transform infrared (FTIR) and fluorescence excitation-emission matrix (EEM) analysis indicated that vermicomposting led to more aromatic structures and much higher humification degree in HA, whereas less protein, FA-like substances and plastein in HA. Vermicomposting could enhance the total Cu content and decrease Cu/Zn bioavailability in the substrate residues, and vermicomposting especially can help stabilize Cu in the substrate residues by forming more complexed HA-Cu.
为揭示有机废弃物的腐殖化过程及其对受蚯蚓活动影响的重金属行为的贡献，研究了混合猪粪和C标记稻草在蚯蚓堆肥过程中腐殖酸（HA）的变化及重金属行为。结果表明，蚯蚓能很好地适应培养环境并摄食有机物质以生长繁殖，蚯蚓堆肥过程增加了底物残渣中腐殖物质（HS）、HA和富里酸（FA）的含量，但导致HA向FA的转化减少。元素分析、紫外吸收光谱、傅里叶变换红外光谱（FTIR）和荧光激发-发射矩阵（EEM）分析表明，蚯蚓堆肥使HA中形成更多芳香结构且腐殖化程度更高，而HA中蛋白质、类FA物质和类蛋白减少。蚯蚓堆肥可提高底物残渣中总铜含量并降低铜/锌的生物有效性，特别是蚯蚓堆肥可通过形成更多络合的HA-Cu帮助稳定底物残渣中的铜。
