Organics degradation characteristics along refining saline wastewater treatment processes

doi:10.16085/j.issn.1000-6613.2021-0905

Abstract

Abstract:

The successive processes including physicochemical units (oil separation+air flotation)+biofilter (BAF)+hydrolysis acidification (HA)+anoxic/oxic (A/O)+oxic-membrane bioreactor (O-MBR)+catalytic ozonation (COP) were used to treat heavy oil refining saline wastewater. The organics degradation characteristics along treatment processes were comprehensively analyzed by GC-MS combined FT-ICR MS. Small molecular organic acids, esters, aldehydes and ketones were dominantly degraded by BAF. HA showed very weak degradation towards organics. Most O₂ species and all N₁O₂S₁ species were degraded by A/O. The O₃S₁ and N₁O₃ species, penetrated from O-MBR, were completely mineralized by COP. The residual COD in the final effluent mainly were macromolecular saturated fatty acid and naphthenic acid with high unsaturation degree. The results may guide the assessment and optimization of heavy oil refinery wastewater treatment plant.

Key words: heavy oil, saline wastewater, organics, degradation characteristics, Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS)

摘要：

某重质油炼化企业采用“物化单元（隔油+气浮）+曝气生物滤池（biofilter，BAF）+水解酸化（hydrolysis acidification，HA）+缺氧/好氧（anoxic/oxic，A/O）+好氧-膜生物反应器（oxic-membrane bioreactor，O-MBR）+催化臭氧氧化（catalytic ozonation，COP）”工艺处理含盐污水。本文采用GC-MS结合FT-ICR MS高等仪器的分析手段，对污水处理工艺全过程的有机污染物降解特征进行了深入研究。发现BAF单元主要去除的是小分子有机酸类、酯类和醛酮类等易降解化合物；HA单元基本未发挥降解作用；A/O单元能大幅度去除O₂类化合物，并能完全降解N₁O₂S₁类化合物；O-MBR单元未能完全降解的O₃S₁类和N₁O₃类化合物在COP单元被完全矿化；最终出水残留COD的构成主要是大分子饱和脂肪酸和高缩合度环烷酸类化合物。本文研究成果可为重质油炼化污水处理工艺的评价与优化提供依据。

关键词: 重质油, 含盐污水, 有机污染物, 降解特征, 傅里叶变换离子回旋共振高分辨质谱

CLC Number:

TE991

KOU Yue, CHEN Yu, YE Huangfan, WANG Qinghong, CHEN Chunmao. Organics degradation characteristics along refining saline wastewater treatment processes[J]. Chemical Industry and Engineering Progress, 2022, 41(4): 2202-2208.

寇悦, 陈宇, 叶黄凡, 王庆宏, 陈春茂. 炼化含盐污水处理全过程有机污染物降解特征[J]. 化工进展, 2022, 41(4): 2202-2208.

Figures/Tables 5

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