Method and device for reducing emission of volatile organic compounds in oily sewage cleaning treatment

The invention relates to a volatile organic compound emission reduction method and a volatile organic compound emission reduction device in oily sewage cleaning treatment, and provides a volatile organic compound emission reduction method in oily sewage cleaning treatment. The method comprises the following steps: (a) carrying out cyclone separation on oily sewage, and removing volatile organic compounds by utilizing cyclone negative pressure so as to reduce the solubility of volatile organic compound gas in the sewage; (b) carrying out shape coalescence separation on the oily sewage obtainedby cyclone separation in the step (a) to demulsify and polymerize the oil, wherein bowing in compressed gas is not required so as not to generate volatile organic compounds discharged due to blowing in the compressed gas; (c) enabling the effluent obtained in the step (b) to directly enter a biochemical system, and canceling an air floatation unit; and (d) collecting the volatile organic compoundsgenerated by cyclone sepa