电解法制备活性氯的研究

以石墨为阴极和 Ir Ru Ti贵金属氧化物电极为阳极 ,采用离子隔膜电解装置 ,直接电解低浓度的氯化钠溶液制备活性氯。对氯化钠浓度、表观电流密度、温度、p H值、电解时间和流速在电化学反应过程中对活性氯浓度及电流效率的影响进行了研究。由实验结果得出最佳的试验条件为 :电解温度 2 2°C,电解液浓度 2 0 .0 g/ L,电流密度 4.46m A/ cm2 ,时间 2 h,流速 1 .40 m/ s,p H值 4.2 0～ 5.0 0。另外 ,利用活性氯分别对生活污水和河水进行杀菌消毒 ,测定了杀菌消毒后的生活污水和河水中的 COD值、细菌和大肠杆菌。由于活性氯具有很强的杀菌消毒功能 ,此方法在水处理中将会得到广泛应用

Study on Electrolytic Production of Active Chlorine in Electrolytic Cell

Electrolytic production of active chlorine in ion exchange membrane electrolytic cell containing dilute chloride solutions was investigated using titanium substrate insoluble anode and graphite cathode. The dependence of the active chlorine production rate on temeprature, chloride concentration, time, current density, the value of pH and current velocity was discussed. The effects of the referred factors on the current efficiency and energy consumption were also discussed. The optimum conditions from the result of experiment are current efficienty 4.46 mA/cm 2, chloride solution 20 g/L, electrolytic time two hours, temperautre 22°C, pH4.20~5.00 and current velocity 1.4 m/s. Sewage of life and river water were sterilized and disinfected in the experiments by using active chlorine of anodic electrolyte. The number of large intestine bacilli, the number of bacilli and the value of COD were determined. Application of the active chlorine in sterilization and disinfections is more remarkably effective than any other disinfectant, so this method will be widely used.