Variations in dissolved organic matter during wastewater treatment in natural gas purification plants

• Published in: Gong ye shui chu li Vol. 44; no. 5; pp. 164 - 170
• Main Authors: HU Wanjin, QU Yang, WU Yan, LIU Wenshi, WANG Xing, WANG Xuemei
• Format: Journal Article
• Language: Chinese
• Published: Editorial Office of Industrial Water Treatment 01.05.2024
• Subjects: dissolved organic matter; fourier transform ion cyclotron resonance mass spectrometry analysis; molecular properties; three-dimensional fluorescence spectroscopy analysis
• DOI: 10.19965/j.cnki.iwt.2023-0887
• ISSN: 1005-829X

Dissolved organic matter (DOM) is a pivotal determinant for wastewater discharge compliance standards. A comprehensive analysis of the molecular composition of DOM is imperative for its efficient removal. In this study, wastewater from a natural gas purification plant was investigated. Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) and three-dimensional excitation-emission-matrix spectra (3D-EEMs) were employed to analyze the fluorescence properties, molecular composition, mass-to-charge ratio, and molecular transformations of DOM during the oxidation process at molecular level. The 3D-EEM results indicated wastewater was dominated by humic substances, followed by fulvic acid substances. O3/H2O2 oxidation reduced the fluorescence intensity of humic substances, while DOM degradation was constrained by the reaction characteristics of ozone with electron-rich organic compounds. In contrast,the O3/H2O2-Fenton combined oxidation significantly reduced the overall fluorescence intensity, and