Transfer behaviors of dissolved organic matter along stripping purified water reusing crude oil electric desalting process
The reusing of stripping purified water(SPW)in crude oil electric desalting process(EDP)is an efficient water-saving measure for petroleum refineries.In this study,a comprehensive analysis based on gas chromatography-mass spectrometry(GC-MS)and orbitrap mass spectrometry(Orbitrap MS)was established,and the transfer behaviors of dissolved organic matter(DOM)along SPW reusing crude oil EDP were investigated at the micro-level.During EDP,13 types of aromatic amines,34 types of nitrogen-containing heterocycles,13 types of medium-/long-chain alkylphenols and 1 type of ether in SPW were transferred into oil phase.The quality of crude oil was not deteriorated while the yield slightly increased,and the total organic load in electric desalting wastewater(EDW)reduced by 50%.Simultaneously,8 types of naphthenic acids,7 types of oxygen-containing heterocycles,3 types of short-chain alkylphenols,5O4 types of O2,O4,O3S1,N1O3 species with low unsaturation and 186 types of O4S1,N1O2 species with high unsaturation originally in crude oil were transferred into water phase,increasing the complexity of DOM constituents and acute bio-toxicity of EDW.The results enhanced insights to highly polluted point-source wastewaters and improved the management of petroleum refineries.
stripping purified watercrude oil electric desaltingdissolved organic mattertransfer behaviorsorbitrap mass spectrometry