Preparation of GAC particle electrode and treatment of old landfill leachate
The conventional fixed plate electrochemical system presents limitations such as electrode passivation,low space utilization,and reduced treatment efficiency.To address these issues,Mn-GAC particle electrodes were prepared using the impregnation method,and a three-dimensional electrolytic system was constructed to evaluate the comprehensive degradation effect on aged landfill leachate.The results demonstrated that particle electrodes with good performance could be successfully prepared under the conditions of 3hours of calcination time,a calcination temperature of 600℃,and an impregnation time of 8hours,as verified by pre-experiments and scanning electron microscopy(SEM).Under optimal conditions—initial pH value of 3,particle electrode dosage of 33.3g/L,current density of 160mA/cm2,and stirring speed of 700r/min—the removal rates of COD,TP,NH4+-N,and TN from the aged landfill leachate reached 81.56％,99.62％,62.82％,and 82.47％,respectively,with an energy consumption of only 0.125kWh/g.The analysis of the oxidation mechanism indicated that pollutant removal was primarily achieved through indirect oxidation,dominated by OH and active chlorine,accounting for 70％of the total contribution.
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