Design And Experimental Research Of Oil-Water Separator Based On Stainless Steel Mesh Screen Modification

During the process of mining and transportation,offshore oil will inevitably leak.Large-scale oil film spreading has a serious impact on the marine ecological environment.The current treatment methods exist incomplete recovery,high water content,secondary pollution and other shortcomings.Screens with superhydrophobic-superoleophilic surfaces show good performance in oil-water separation,the principle of which is according to the extreme difference in wettability of oil and water on the screen surface,the oil can penetrate rapidly while the water can't be spread,oil and water are separated eventually.Based on this,in order to recover the oil slick at sea,this paper designs a new type of oil-water separation device.The main body of the system adopts the shape of a roundabout,and the oil-separating site adopts a stainless steel mesh with super-hydrophobicity and super-oleophilicity.After the design is completed,an experimental platform for oil-water separation is set up to conduct experimental research on the oil-water separation device in the still water surface and the fluctuating water surface.In this paper,a superhydrophobic-superoleophilic surface was successfully prepared by using copper sulfate solution to increase the surface roughness of the screen,followed by low surface energy modification with stearic acid.The static contact angle of water droplets on the modified silk screen was 156.4°,rolling angle was 4.96°.In the oil-water separation process,the screen could be reused many times,and also had good performance in terms of static pressure and dynamic pressure.The oil flowed into the reservoir oil chamber under the combined effect of surface tension and gravity,and the water was blocked by the screen outside the unit.After testing,the recovered oil contained no moisture.Following the principle of the stability check of the hull,this paper verified and calculated the designed oil-water separation device,which proved that the device can float well on the surface of the water and still maintain its stability through self-regulation when inclined at 0°-15°.During the experiment,it was found that the water ring was formed due to the surface tension of the water and oil,and the contact between the oil slick and the water was blocked.As a result,the recycling efficiency was low,and 0.5 L remained in each condition.Wave water surface would prevent the formation of water ring,the final oil separation efficiency was 94%.This paper revealed the formation mechanism of water ring,and put forward the oil-water separation device to make their own oscillation method to improve the work in the stationary water shortcomings.The new oil-water separation device designed in this paper can realize the oil-water separation efficiently and steadily both at still water surface and fluctuating water surface,and it has certain generalization and can be enlarged proportionally to practical application.In addition,the mechanism of oil spreading on the surface of the water is explained,which is of guiding significance to the future treatment of the oil slick at sea.