Characteristics of Dissolved Organic Matter Released From Aerobic
Composted Municipal Sludge After the Agriculture Use
SHI Cong-hui1, ZHANG Rui-chang1, 2*, ZHU Shu-fa1, LI Xin-tong1, ZHOU Xin-quan1, ZHANG Ning1, RONG Liang3, YANG Li-zhen3, WEI Xue-feng1, 2*
1. School of Chemistry & Chemical Engineering, Henan University of Science and Technology, Luoyang 471023, China
2. Provincial and Ministerial Co-Construction of Collaborative Innovation Center for Non-Ferrous Metal New Materials and Advanced Processing Technology, Luoyang 471023, China
3. China Wuzhou Engineering Group Corporation Ltd., Beijing 100053, China
Abstract：Investigations on the characteristic of dissolved organic matter released from sludge after agricultural use could help to evaluate and predict the environmental behaviors and ecological effects of the concurrent pollutants in soils. The characteristics change in concentration, molecular weight, composition, structure and other properties of DOM released from aerobic composted municipal sludge sampled from a sludge treatment plant in Luoyang City, Henan Province were characterized with Scanning Electron Microscope (SEM), total organic matter analyzer (TOC), UV-Vis absorbance spectroscopy, gel permeation chromatography (GPC), three-dimensional excitation-emission matrix (3D-EEM), Fourier transformation infrared spectroscopy (FTIR) and 1H nuclear magnetic resonance (NMR). Results showed a significant change in the microscopic morphology of the released DOM, varying from dense lumps to irregular loose material within 60 d of the release process. Dissolved organic carbon released from sludge was in the range of 4.25 to 6.22 mg·g-1 dry sludge, presenting an early increase and later decrease trend. Significant changes in molecular weight and aromaticity of DOM were seen during the release process. The measured molecular weight of DOM increased from 2 674 g·mol-1 on the 5th day to 129 026 g·mol-1 on the 60th day. The aromatic compounds in DOM gradually accumulate during the release process. 3D-EEM combined with the parallel factor analysis (PARAFAC) model was used to analyze the fluorescent substances in the released DOM, and it was found that the main fluorescent substances in DOM were fulvic-like and humic-like compounds. The humic-like compounds gradually accumulated during the process, resulting in the humification of the released DOM. The reduction of aliphatic alkane compounds and formation of aromatic compounds in DOM were indicated in FTIR. Variations in the quantity and properties of DOM released from sludge after agricultural use might significantly change the environmental behaviors and ecological effects of the coexisting pollutants in soils. These results may provide insights into the evaluation and prediction of sludge for agricultural use and have guiding significance to the utilization of municipal sludge resources.
Key words：Agricultural use of sludge; Dissolved organic matter; Release characteristic; Molecular weight; Aromaticity
时聪慧，张瑞昌，朱书法，李欣彤，周新全，张 宁，荣 亮，杨丽珍，魏学锋. 好氧堆肥污泥农用后溶解性有机质释放特征[J]. 光谱学与光谱分析, 2024, 44(04): 1011-1017.
SHI Cong-hui, ZHANG Rui-chang, ZHU Shu-fa, LI Xin-tong, ZHOU Xin-quan, ZHANG Ning, RONG Liang, YANG Li-zhen, WEI Xue-feng. Characteristics of Dissolved Organic Matter Released From Aerobic
Composted Municipal Sludge After the Agriculture Use. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(04): 1011-1017.
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