With the rapid development of China's economy,the demand for petroleum energy is also increasing.In the process of petroleum production,a large amount of oily wastewater is generated,which has complex components.Improper treatment or arbitrary discharge of these oily wastewater can cause serious pollution to the ecological environment.Based on this background,the treatment methods for oily wastewater were summarized and reviewed,aiming to provide some reference and basis for the selection of treatment processes for oily wastewater.At present,the physical methods for treating oily wastewater include membrane separation,adsorption,flotation,hydrocyclone,filtration,and electromagnetic methods;chemical methods include chemical flocculation,microelectrolysis,hydrolysis acidification,photocatalytic oxidation,Fenton oxidation,and ozone oxidation;biological methods include biofilter method,activated sludge method,membrane bioreactor,biofilter method,biological contact oxidation method,etc.Because each process has certain advantages and disadvantages,a suitable process or a combination of multiple processes should be chosen to treat oily wastewater according to the actual situation of wastewater characteristics and economic costs.
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