Preparation of GAC particle electrode and treatment of old landfill leachate
ZHANG Mao1, LI Xiang1,2,3, WANG Jun4, YUAN Yan1, HUANG Yong1,2
1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China; 2. Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou University of Science and Technology, Suzhou 215009, China; 3. Suzhou Tianjun Environmental Technology Co., LTD., Suzhou 215000, China; 4. Suzhou Gu Yue Shui Wan Environmental Protection Technology Co., Ltd, Suzhou 215011, China
Abstract：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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