电镀废水氧化破氰工艺优化试验

Process Optimization of Breaking Cyanogens by Oxidation for Treatment of Electroplating Effluent

采用二级氧化法对某电镀厂含氰废水处理工艺进行了正交和单因素优化试验，当完全氧化投药比m（NaClO）：m（CN^-4）=10，一级pH=10．5～11,二级pH≥9．反应时间为15-25min时，氰去除率可达到99％以上,pH值对反应具有决定性影响，pH值越高处理效果越好；优化工艺处理后出水水质可达到广东省一级排放标准．

The two-stage oxidation reaction process is used in orthogonal and single factor optimization trials to treat electroplating effluent containing cynide from an electroplating factory. The result shows that under the condition of complete oxidation with NaCIO：CN^-=10, pH=10. 5-11.0 in the first stage, and pH≥9 in the second stage, HRT=15-25 min, the removal rate of cyanogen reaches above 99% and that the pH is the key factor affecting the reaction with a general trend： the higher the pH, the better the treatment effect. The quality of the effluent using the optimized treatment process meets the first grade of Pollutant Discharge Standard of Guangdong Province.