电激发羟基自由基处理含氰废水的中试应用

The Pilot Engineering Application of the Cyanide Degradation Technique by Electro Generated Hydroxyl Radical

本项目是在工业应用的三维电极反应器基础上,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。试验数据表明,采用两级三维电极激发羟基自由基处理电镀含氰废水,每级反应时间为30 min,总体去除率高达90%以上。处理含氰化物100 mg/L以上的电镀含氰废水,对比传统的碱式氯化法,具有明显的经济优势,运行费用节省了50%以上。

In this thesis, the main research content was that using the electro-generated hydroxyl radical to oxidize-degrade the cyanide into CO： 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 experimental results showed that if the cyanide pollutants were oxidized 30 rain in two stages three-dimension electrode reactor, the total removal rate of cyanide could reach more than 90 %. It also showed that the cost of this treatment method could save more than 50 % compared with oxidizing the cyanide by NaCIO as the concentration of cyanide was above 100 mg/L.