可见光分解-氯碱氧化法去除废水中的铁氰化物

采用可见光分解（光解）-氯碱氧化法去除模拟废水中的Fe（CN）63-。考察了光解过程中反应时间、初始Fe（CN）63-质量浓度和初始废水pH对Fe（CN）63-去除效果及表观反应速率常数（k（Fe（CN）63-））的影响，以及光解-氯碱氧化法对Fe（CN）63-模拟废水中总氰化物（TCN）的去除效果。实验结果表明：在初始Fe（CN）63-质量浓度6.7 mg/L、初始废水pH 12、反应时间8.0 h的条件下，Fe（CN）63-的去除率为83%，光解过程符合表观一级动力学模型;在初始Fe（CN）63-质量浓度6.7 mg/L、初始TCN质量浓度4.90 mg/L、初始废水pH 12、反应时间12.0 h的条件下，采用光解-氯碱氧化法可使Fe（CN）63-模拟废水的TCN质量浓度降至0.14 mg/L，低于GB 16171—2012的要求（0.2 mg/L），该过程的限速步骤为Fe（CN）63-的光解破络过程。

Removal of Ferricyanide from Wastewater by Visible Light Photolysis-Chloroalkali Oxidation Process

Fe(CN)63- was removed from the simulated wastewater by visible light photolysis-chloroalkali oxidation process. The effects of reaction time，initial Fe(CN)63- mass concentration and initial pH on Fe(CN)63- photolysis and the apparent reaction rate constant k(Fe(CN)63-) were studied，and the removal of TCN from the wastewater by the process were investigated. The experimental results show that：Under the conditions of initial Fe(CN)63- mass concentration 6.7 mg/L，initial wastewater pH 12 and reaction time 8.0 h，the Fe(CN)63- removal rate is 83%，and the process fits the apparent first-order kinetics model;When the initial Fe(CN)63- mass concentration is 6.7 mg/L，the initial TCN mass concentration is 4.90 mg/L，the initial wastewater pH is 12 and the reaction time is 12.0 h，the Fe(CN)63- simulated wastewater is treated by the process and the initial TCN mass concentration is decreased to 0.14 mg/L，which is lower than that of national standard GB 16171-2012 (0.2 mg/L). The rate limiting step of the process is the photolysis of Fe(CN)63-.