石墨三维电化学反应器工作性能分析

Working performance of three-dimensional electrode reactor of graphite particle

采用自制石墨三维电化学反应器,考察了在粒子大小、主极板电压及粒子数量变化的情况下其粒子电流以及主极板电流,对石墨三维电化学反应器的工作效率进行了分析,在此基础上,利用二维反应器和石墨三维电化学反应器处理甲硝唑废水和亚甲基蓝废水,考察废水中总有机碳降解率及脱色效果.结果表明:粒子电流与主极板电压、粒子大小成正相关,石墨粒子和钛粒子两者电化学行为相同,但石墨粒子的粒子电流更大,说明在三维电极反应体系中,用石墨做粒子电极是可行的,可通过调整充填粒子大小和粒子数量改变粒子电流,从而提高三维电极反应器降解速率;当石墨三维反应器主极板外电压为12 V、电解质浓度为0.1 mol/L、石墨粒子数量为8时,反应前15 min比二维反应器反应速度快,对甲硝唑有机废水总有机碳去除率比二维电极反应器高14%,对亚甲基蓝废水脱色率比二维反应器高10%,说明设计的石墨三维电化学反应器对甲硝唑和亚甲基蓝废水中总有机碳和色度有很好的降解效果,且优于二维反应器.

The current of particles and main plate was explored by three-dimensional electrochemical reactor of graphite electrode.We used two-dimensional electrode reactor and three-dimensional electrode reactor which graphite was used as particle electrodes to treat metronidazole wastewater and methylene blue wastewater,and then studied the efficiency of removing total organic carbon and color degradation.Experimental results show that the particles current of plate particle electrode is positively correlated with main plate voltage and particles size; the electrochemical behaviors of graphite particle and titanium particle are the same,but electricity of graphite particle is bigger,which indicates that the method of using graphite particle as three-dimensional electrode is available; the efficiency of tree-dimensional electrode reactor increases by changing main particles size and number; the reaction rate of three-dimensional electrode reactor is faster than that of two-dimension electrode reactor in the first 15 minutes under the conditions of cell voltage of 12 V,particle numbers of 8 and concentration of supporting electrolyte of 0.1 mol/L; the graphite particle three-dimensional electrode reactor on the removing total organic carbon of metronidazole wastewater increases 14％ and the color degradation rate of methylene blue wastewater increases 10％,which illustrates that using three-dimensional electrode reactor of graphite particle has better effects on removing total organic carbon and degrading color of metronidazole wastewater and methylene blue wastewater compared with twodimension electrode reactor.