天然气净化厂废水处理过程中溶解性有机物的变化  

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

作　　者：胡万金 瞿杨 吴雁[1] 刘文士 王鑫[1] 王雪梅[1] HU Wanjin;QU Yang;WU Yan;LIU Wenshi;WANG Xing;WANG Xuemei(School of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610000,China;Natural Gas Purification Plant of PetroChina Southwest Oil and Gas Field Company,Chongqing 400000,China)

机构地区：[1]西南石油大学化学与化工学院,四川成都610000 [2]中国石油西南油气田公司天然气净化总厂,重庆400000

出　　处：《工业水处理》2024年第5期164-170,共7页Industrial Water Treatment

摘　　要：溶解性有机物(DOM)是废水达标排放标准的重要考虑因素,综合分析废水中DOM的分子组成是对其高效去除的前提。以某天然气净化厂废水为研究对象,采用傅里叶变换离子回旋共振质谱法(FT-ICR MS)和三维荧光光谱(3D-EEMs)从分子层面深入分析氧化过程中DOM的荧光性质、分子组成、质荷比、分子转化。EEM结果表明,废水中主要以类腐殖质物质为主,其次为富里酸类物质。O_(3)/H_(2)O_(2)氧化降低了类腐殖质物质的荧光强度,但DOM降解受限于臭氧与富含电子有机物的反应特性;而O_(3)/H_(2)O_(2)-Fenton联合氧化能大幅降低总荧光强度,有效去除类腐殖质。FT-ICR MS结果表明,O_(3)/H_(2)O_(2)氧化去除了部分CHO类、CHON类DOM,但对CHOS类、CHONS类DOM的去除效果欠佳。多环芳烃和高度不饱和的化合物被臭氧降解为脂肪族类化合物,增加了CHO类DOM含氧量。O_(3)/H_(2)O_(2)-Fenton氧化对CHOS类、CHONS类DOM具有较好的去除效果,去除了大部分多酚化合物,生成具有含氧量更低和饱和度更高的DOM。同时,联合氧化极大地缓解了超滤膜污染,去除了大部分可逆污染和不可逆污染。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.O_(3)/H_(2)O_(2) 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 O_(3)/H_(2)O_(2)-Fenton combined oxidation significantly reduced the overall fluorescence intensity,and effectively removed humic-like substances.FT-ICR MS results revealed that O_(3)/H_(2)O_(2) oxidation removed part of CHO and CHON type DOM,while the removal efficiency for CHOS and CHONS types was less pronounced.Polycyclic aromatic and highly unsaturated compounds were transformed into aliphatic compounds by ozone,with increase of the oxygen content of CHO type DOM.O_(3)/H_(2)O_(2)-Fenton oxidation exhibited superior removal efficiency for CHOS and CHONS type DOM,which almost eliminated polyphenolic compounds and generated DOM with lower oxygen content and higher saturation.Furthermore,the combined oxidation process significantly mitigated ultrafiltration membrane fouling with removing a substantial portion of reversible and irreversible fouling.

关 键 词：溶解性有机物 傅里叶变换离子回旋共振质谱分析 三维荧光光谱分析 分子特性 

分 类 号：X703.1[环境科学与工程—环境工程]