Molecular composition characteristics of dissolved organic compounds in the process of treatment of marine oily wastewater by activated carbon precoated dynamic membrane
Dynamic membrane technology has the advantages of high efficiency and low cost in the field of advanced treatment of marine oily wastewater.However,the composition of organic matter in marine oily wastewater is extremely complex,and further study is necessary for the molecular characteristics and changes in the dynamic membrane treatment process.In this study,ultra-high-resolution mass spectrometry was used to investigate the changes in the molecular composition characteristics of dissolved organic matter(DOM)in marine oily wastewater during dynamic membrane filtration treatment.The results showed that there were more than 2 200 DOM molecular formulas in raw marine oily wastewater,which were mainly composed of heteroatomic-containing substances such as CHOS and CHONP.Due to the significant adsorption capacity of activated carbon,an excellent removal rate occurred for most organic matter in the first 10 minutes of the dynamic membrane treatment process.The removal rates of COD and DOC in wastewater were both greater than 80％,and high molecular weight and unsaturated oxidizing DOM was effectively removed at this stage.Subsequently,the adsorption capacity of activated carbon decreased,and the removal rates of COD and DOC by the dynamic membrane gradually declined,both dropping to around 50％after 60 minutes,moreover no significant changes occurred in the molecular composition of DOM in the marine oily wastewater.This study revealed the molecular composition and variation characteristics of DOM in the process of dynamic membrane treatment of marine oily wastewater,and could provide a certain process reference for the efficient treatment of refractory marine oily wastewater by dynamic membrane technology.
dynamic membranemarine oily wastewaterdissolved organic matterultra-high tesolution mass spectrometry
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