Membrane contamination control mechanism in the pulsed electrocoagulation-membrane separation reactor
In order to improve the shortcomings of DC electrocoagulation-membrane cathode reactor(ECMCR)such as plate passivation and high energy consumption in practical applications,this study developed a pulsed electrocoagulation-membrane cathode reactor(PECMCR)and analyzed the membrane contamination control mechanism in it.It was found that ECMCR could remove humic acid(HA)up to 85.23％,by comparison,the optimal removal efficiency of HA of was higher than 90％by the pulsed electrocoagulation-membrane separation reactor with the same aluminum production and energy consumption,and their trans-membrane differential pressures decreased by 36％and 20％,respectively.PECMCR had better HA removal and membrane contamination mitigation effect compared with ECMCR,which may be attributed to the accelerated diffusion of metal cations in the solution under the action of pulsed electric field,which could reduce or eliminate the passivation phenomenon of the metal anode,and thus could effectively improve the removal efficiency of HA.Moreover,the electrostatic repulsion between HA and the membrane cathode could reduce the adhesion of HA pollutants on the membrane,which was conducive to further alleviating membrane contamination.In addition,pulsed electro-flocculation can alleviate electrode passivation,which was conducive to further saving energy consumption.The results of this study provide a new solution for the application of PECMCR to control membrane contamination in water treatment process.
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