电激发羟基自由基降解氰化物的实验研究

Research on Cyanide Degradation Technique by Electro Generated Hydroxyl Radical

该文采用三维电极反应器实验装置,利用电激发羟基自由基的强氧化性来处理氰化物,将其氧化分解为二氧化碳和氮氧化合物。反应器使用石墨板作为阴阳电极,颗粒活性炭填充在石墨电极间作为粒子电极,采用直流电源进行供电,分析了在该三维电极系统中,进水浓度、进水pH值、施加电压以及反应时间等因素对氰化物降解率的影响。试验数据表明,采用三维电极激发羟基自由基处理电镀含氰废水,去除率可高达90%以上。随着施加电压的增加、反应时间的延长,氰去除率均增大,但降解速度变缓。

In this thesis,the main research content was that using the electro-generated hydroxyl radical to oxidize--degrade the cyanide into CO2 and NOx,which was based on the three--dimension electrode reactor.The three--dimension electrode reactor was composed of two graphite electrodes,granular activated carbon as fillers between the elecrodes,and the power of the reactor supplied by direct current.The effects of operating conditions on the oxidation efficiency of cyanide are investigated such as cell voltage,initial pH,concentration of wastewater and reaction time,etc. The experimental results showed that the total removal rate of cyanide could reach more than 90%.The rate would increase basing on the increase of the ceil voltage and reaction time,but the speed of reaction decreased progressively.