Abstract:
Objective Oil-bearing scum is the main hazardous waste generated from the refinery wastewater treatment process. In-depth analysis of the organic molecular composition of emulsified oil and dissolved organic matter (DOM) in scum has guiding significance for the selection and design of process conditions for treatment, co-disposal and resource recovery of scum.
Methods Emulsified oil, DOM and inorganic matter were enriched in the scum by extraction and column chromatography separation, and the inorganic composition and the organic molecular composition of each phase in the scum of the refinery wastewater treatment plant were analyzed by X-ray diffraction, gas chromatography-mass spectrometry coupling, and electrostatic field orbital trap mass spectrometry.
Results It was found that the VOCs in the tested scum samples consisted mainly of n-alkanes, cycloalkanes and benzene series. The emulsified oil and DOM obtained by separation contained a large number of highly polymerized oxygen-containing and nitrogen-containing heteroatom compounds with good hydrophilicity, such as alkylbenzene sulfonates and their derivatives, polyoxyethylene ethers, fluorine-containing polar compounds. The scum contains suspended solid particles based on polymerized ferric sulfate, quartz, etc.
Conclusions Under the combined action of surfactants such as alkylbenzene sulfonates, strongly polar heteroatom compounds containing oxygen, nitrogen and sulfur, and solid particles such as quartz, scum tends to show a heterogeneous stable multiphase system with high oil and water content.
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