Oily wastewater mainly comes from petrochemical, iron and steel, coking, gas generating stations, mechanical processing and other industrial sectors. Oils generally exist in wastewater in three states:

(1) Float on oil. Oil droplets have a particle size larger than 100 microns and are easy to separate from wastewater.

(2) Disperse oil. The oil droplets are between 10-100 microns in size and are suspended in water.

(3) Emulsified oil. Oil droplets have a particle size of less than 10 microns and are not easy to separate from wastewater.

The treatment of oily wastewater should first use the oil separator to recover floating oil or heavy oil. The treatment efficiency is 60%-80%, and the oil content in the effluent is about 100-200 mg/L. Emulsified oil and dispersed oil in wastewater are difficult to handle, and emulsification should be prevented or reduced. One of the methods is to reduce the emulsification of oil in the wastewater during the production process; the other is to minimize the number of times the wastewater is lifted by the pump during the treatment process, so as not to increase the degree of emulsification. The treatment methods are usually air flotation and demulsification.

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Mainly used: The second and third mining of crude oil output products dehydration, oilfield waste water treatment, oil-containing polymer flooding sewage, oil refinery wastewater treatment, food oily wastewater treatment, wastewater of middle deinking paper mill and deinking sewage treatment, urban underground wastewater treatment ect..