Study On The GAC Regeneration Experiment And Mechanism By Electrochemical Method

As a high quality adsorbent,activated carbon has been widely used in environmental protection field.Considering the problems such as economical efficiency and secondary pollution,it needs to be regenerated reasonably.In this paper,an electrochemical regeneration method with high efficiency,stable and environmental protection advantage is adopted to regeneration saturated activated carbon.In this paper,the saturated adsorption of new carbon was carried out in high organic pollutant concentration and low carbon quality,and then regenerating the saturated carbon by electrochemical method,and the adsorption capacity of activated carbon before and after regeneration was then been compared.The adsorption properties of phenol and rhodamine B were investigated in the experiment.In the three-dimensional electrode reactor,the activated carbon filling method was determined by changing the contact of the activated carbon particles with electrodes.The result shows that cathode regeneration shows up the best regeneration effect,and the same compartment regeneration effect is the worst.On this basis,the influence of different factors during cathode regeneration,such as the kind and concentration of electrolytes,regeneration time and regeneration current,had been analyzed and found a set of relatively optimal regeneration condition: NaCl as the regeneration electrolyte,electrolyte concentration 2%,regeneration time 8 h,regenerative current 120 mA,the regeneration efficiency could reach to 95%.The regeneration efficiency could be maintained at a stable level after 5 times regeneration-adsorption cycles at the best regeneration condition.Using SEM and BET to carry out the characterization analysis of activated carbon particles,found that the electrochemical method had little effect on the surface and pore structure of activated carbon,and the conclusion that electrochemical regeneration method is stable and feasible was gotten.Finally,the mechanism of electrochemical regeneration was discussed,and the degradation pathway of phenol in electrochemical regeneration was determined by high pressure liquid chromatography(HPLC)and ultraviolet spectra.