Molecular recognition of dissolved organic matter in bio-treated effluent of coking wastewater

被引：0
|
作者：
Wang Q. [1 ,2 ,3 ]
Kou L. [1 ,2 ,3 ]
Wang G. [1 ,2 ,3 ]
Wang J. [1 ,2 ,3 ]
Liu M. [1 ,2 ,3 ]
Li L. [1 ,2 ,3 ]
Wang H. [1 ,2 ,3 ]
机构：
[1] China Coal Research Institute, Beijing
[2] State Key Laboratory of Coal Mining and Clean Utilization, Beijing
[3] National Energy Technology, Equipment Laboratory of Coal Utilization and Emission Control, Beijing
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷 / 09期
关键词：
bio-treated effluent; coking wastewater; dissolved organic matter; molecular recognition;
D O I：
10.16085/j.issn.1000-6613.2022-1868
中图分类号：
学科分类号：
摘要：
The composition of soluble organic compounds in coking wastewater is complex and difficult to be biodegraded. In order to reveal the composition of soluble organic compounds in the biological effluent of coking wastewater from the molecular level, dichloromethane was first used as the extractant to separate the biological effluent of coking wastewater from Hebei Qian’an Hong’ao Industry and Trade Coking Plant into organic phase and raffinate phase through liquid-liquid extraction. The organic phase was separated into four components. According to the different polarity of the four components, the saturated and aromatic components with weak polarity were analyzed by GC/MS, and the resin and asphaltene with strong polarity were analyzed by Fourier transform ion cyclotron resonance mass spectrometry combined with electric spray ionization source (ESI FT-ICR MS).The SPE eluate was obtained from the strongly polar raffinate by solid phase extraction and analyzed by ESI FT-ICR MS. The results showed that one hundred and twenty kinds of compounds were detected in the saturated fraction, and the insoluble organics in the coking wastewater after biological treatment were mainly n-alkanes and alkanes with higher molecular weight. Thirty-four compounds were detected in the aromatic fraction, mainly alcohols, esters and phenols with high content, of which phenols were mainly alkyl substitutes of phenol. The resin, asphaltene and SPE eluate detected five main types of alkaline and non alkaline organics, including Nx, N1Ox, N2Ox, Oxand OxS1, respectively. The distribution of compound types in resins and asphaltenes was similar, and the compounds in asphaltenes were more abundant. The distribution of compound types in SPE eluates was quite different from those in resins and asphaltenes. According to the carbon number distribution and DBE value, the molecular structures of the main compounds were obtained, which provided a theoretical basis for the optimization and improvement of the coking wastewater advanced treatment process. © 2023 Chemical Industry Press. All rights reserved.
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页码：4984 / 4993
页数：9
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