Study On Oily Wastewater Treatment By Centrifugal Separation Coupling Electrocatalytic Carbon Membrane

With the development of economic globalization,the global shipping industry has also developed vigorously,but at the same time,it has also brought serious marine environmental pollution problems,in which the harm of oil substances is the most serious.Oil-water separator is one of the most important components of marine anti-pollution system.In order to meet the requirement of MEPC.107(49)that the concentration of oil-bearing sewage is less than 15 ppm,this paper adopted centrifugal separator coupled with electrocatalytic carbon membrane dual-effect treatment system,which could give full play to the advantages of centrifugal separator in dealing with high concentration suspended oil and use electrochemical catalytic carbon membrane to degrade emulsified oil to achieve the efficient treatment of oily wastewater.The main work of this paper was as follows:(1)The centrifugal separator was used to study the treatment effect of simulated oily wastewater under the conditions of frequency of converter,feed rate and initial concentration of oily wastewater.The results showed that the treatment capacity of centrifugal separator increased with the increase of frequency of converter,but the treatment capacity decreased with the increase of feed rate.When the concentration of oily wastewater was 5000 mg/L?30000 mg/L,the treatment capacity of centrifugal separator had nothing to do with the oil concentration.The results showed that the centrifugal separator had better treatment effect on suspended oil.(2)At the same time,the separation ability of centrifugal separator for emulsified oil and oily wastewater with different salinity was investigated.The results showed that centrifugal separator had better effect on simulating oily wastewater with high salinity,but it was not suitable for treating oily wastewater with emulsification.(3)In this paper,the treatment effect of carbon membrane electrocatalysis system on simulated emulsified oil wastewater was investigated.CuO/electrocatalytic carbon membrane were prepared by electrodeposition.The effect of deposition time on the treatment efficiency of CuO/electrocatalytic carbon membrane was studied.The structure of CuO/electrocatalytic carbon membrane was characterized by various characterization methods and the suitable electrodeposition time was 15 minutes.An electrocatalytic carbon membrane treatment system was constructed based on the carbon membrane as the electrode material.With the removal rate of emulsified oil and the flux of carbon membrane as the indexes,the effects of operating voltage,initial concentration of emulsified oil wastewater and rotational speed of peristaltic pump on the electrocatalytic system of carbon membrane were investigated,and the reasons for the effects were analyzed.The results showed that the applied voltage significantly increased the flux of CuO/electrocatalytic carbon membrane,and the flux also increased with the increase of applied voltage.In this paper,the emulsified oily wastewater of 50 mg/L,100 mg/L,150 mg/L and 200 mg/L was treated.The results showed that the higher the initial concentration,the smaller the membrane flux.The flux of CuO/electrocatalytic carbon membrane was affected by the rotational speed of peristaltic pump.Under the action of mass transfer impetus,the higher the rotational speed of peristaltic pump,the higher the initial flux and stable flux were,but when the rotational speed of peristaltic pump increased to 32 r/min,The permeation flux would decrease sharply.However,the change of above conditions did not lead to the decrease of deoiling rate of simulated oily wastewater,which was due to the structure of carbon film itself.The dual-effect treatment system of centrifugal separator coupled with electrocatalytic carbon membrane has a good effect on the treatment of oily wastewater containing both suspended oil and emulsified oil,and has a good prospect in the application of oily wastewater treatment.