洞察城市固体废弃物堆肥过程中金属离子的命运与溶解有机物组分精细分类及转化顺序的关系。
Insight into the fate of metal ions in response to the refined classification and transformation order of dissolved organic matter components during municipal solid waste composting.
作者信息
Wang Yan, Xi Beidou, Li Yanhong, Dang Qiuling, Zhang Chuanyan, Zhao Xinyu
机构信息
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; State Environmental Protection Key Laboratory of Hazardous Waste Identification and Risk Control, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; School of Environmental Science and Engineering, Guilin University of Technology, Guilin, 541000, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; State Environmental Protection Key Laboratory of Hazardous Waste Identification and Risk Control, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
出版信息
Environ Res. 2023 Apr 15;223:115468. doi: 10.1016/j.envres.2023.115468. Epub 2023 Feb 11.
The refined classification and subtle transformation order of dissolved organic matter (DOM) components may govern the fate of metal ions (MIs) during composting. However, the classification of DOM components is still rough and the fate of MIs in response to the refined transformation order of DOM during municipal solid waste composting (MSWC) has not been studied. Here, the refined classification and evolution order of DOM components were redefined by two-dimensional correlation spectroscopy (2DCOS) analysis. Eight DOM components were redefined and their evolution order was: tyrosine-like (peak B)>humic acid-like (peak C1>peak C2)>terrestrial humic-like with small molecular size (peak A)>UVA humic-like with medium molecular size (peak D2)>UVC humic-like with medium molecular size (peak D1)>UVA humic-like with large molecular size (peak E2)>UVC humic-like with large molecular size (peak E1). Na and As were releasing in the whole process of DOM transformation. Cu and Al showed strong affinity with humic-like fraction, the anabolism of which leading to storage of Cu and Al in compost. Si, Fe, Mn, Co, Zn, Ni, Sr, Mg and Cr tend to combine with humic-like fraction with small molecular size. These responses were influenced by synergistic effect of key microorganisms (two bacterial groups and three fungal groups), in which the contribution of bacteria was greater than fungus. Finally, partial least-square path models of "environmental factors-key microorganisms-transformation order of DOM-MIs" were constructed. The combination of humic-like fractions continuously produced during MSWC and MIs made compost product with potential environmental risks. It is of great significance to develop abiotic factors regulation approach based on refined classification and transformation of organic components for reducing environmental risks of compost product.
溶解有机物（DOM）组分的精细分类和微妙转化顺序可能决定堆肥过程中金属离子（MIs）的归宿。然而，DOM组分的分类仍然粗略，且尚未研究城市固体废弃物堆肥（MSWC）过程中MIs对DOM精细转化顺序的响应。在此，通过二维相关光谱（2DCOS）分析重新定义了DOM组分的精细分类和演化顺序。重新定义了8种DOM组分，其演化顺序为：类酪氨酸（峰B）>类腐殖酸（峰C1>峰C2）>小分子陆地腐殖质类（峰A）>中等分子大小的UVA类腐殖质（峰D2）>中等分子大小的UVC类腐殖质（峰D1）>大分子大小的UVA类腐殖质（峰E2）>大分子大小的UVC类腐殖质（峰E1）。Na和As在DOM转化的整个过程中都在释放。Cu和Al与类腐殖质部分表现出很强的亲和力，其合成代谢导致Cu和Al在堆肥中储存。Si、Fe、Mn、Co、Zn、Ni、Sr、Mg和Cr倾向于与小分子大小的类腐殖质部分结合。这些响应受到关键微生物（两个细菌组和三个真菌组）协同作用的影响，其中细菌的贡献大于真菌。最后，构建了“环境因子-关键微生物-DOM-MIs转化顺序”的偏最小二乘路径模型。MSWC过程中持续产生的类腐殖质部分与MIs的结合使得堆肥产品具有潜在的环境风险。基于有机组分的精细分类和转化开发非生物因子调控方法对于降低堆肥产品的环境风险具有重要意义。
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