Cai Siying, Liu Ming, Zhang Yu, Hu Aibin, Zhang Weijun, Wang Dongsheng
School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China.
School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China; Beijing Machinery & Electricity Institute Co., Ltd, Beijing 100020, China.
Bioresour Technol. 2022 Nov;364:128141. doi: 10.1016/j.biortech.2022.128141. Epub 2022 Oct 17.
Using Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICR MS) and molecular reaction network analysis, this study investigated molecular transformation of dissolved organic matter (DOM) and formation pathway of humic substances (HS) in dredged sludge during aerobic composting. The results showed that macromolecular N-containing compounds in dredged sludge are abundantly transformed into unsaturated and aromatic oxygenated compounds, exhibiting physicochemical properties similar to those of humus. Especially, N-containing compounds with one nitrogen atom are susceptible to oxidative deamination. Furthermore, assemblages of reactive fragments (e.g., -CHO, -CHO, -CHO, and -CHO) were identified as potential precursors to HS formed by the following reactions: starting with protein deamination and desulfurization, lignin delignification cascaded, finally decarbonylation occurred. This work provides novel insight for optimizing the process of stabilization and humification of dredged sludge.
本研究利用傅里叶变换离子回旋共振质谱（FT-ICR MS）和分子反应网络分析，对疏浚污泥好氧堆肥过程中溶解有机物（DOM）的分子转化和腐殖质（HS）的形成途径进行了研究。结果表明，疏浚污泥中的大分子含氮化合物大量转化为不饱和和芳香族含氧化合物，其理化性质与腐殖质相似。特别是，含一个氮原子的含氮化合物易发生氧化脱氨反应。此外，反应性片段（如-CHO、-CHO、-CHO和-CHO）的组合被确定为通过以下反应形成HS的潜在前体：从蛋白质脱氨和脱硫开始，木质素脱木质化级联反应，最后发生脱羰反应。这项工作为优化疏浚污泥的稳定化和腐殖化过程提供了新的见解。
