采用微电流电解技术对模拟游泳池水中的尿素进行降解处理,探索了电解对尿素的去除机理,研究了电流密度和氯离子浓度等因素对电解去除尿素效果的影响。结果表明:以钌钛和不锈钢分别做阳极和阴极材料,当水溶液中有较高浓度的氯离子存在时,电解过程中产生的活性氯使得尿素被氧化,尿素降解产物中无氨氮、氯胺等二次污染物,尿素极有可能通过电解生成了N₂等气体挥发到空气中。电流密度和氯离子浓度对尿素的去除效率有很大影响,随着电流密度和氯离子浓度的增加,尿素去除效率逐渐上升。在400 mg/L的氯离子浓度条件下,电流密度为12 mA/cm²时,电解处理30 min时尿素去除率可达99.5%。将微电流电解技术应用于游泳池水中的尿素去除,无需添加电解质,即能达到较高的尿素去除效果,采用该技术对游泳池水中的尿素进行降解去除完全可行。

In this research, urea in swimming pools was treated by low-amperage electric current, and the influence factors including current density and chloride ion concentration and the mechanism of electrolytic removal of urea were investigated. Results indicated that urea was oxidized by active chlorine which was produced when there was high concentration of chloride ion in the solution with ruthenium-titanium as anode material and stainless steel as cathode material. No harmful by-product such as ammonia nitrogen or chloramines was produced. Urea possibly degraded into gases like N₂ and volatilized into the air. Current density and chloride ion concentration have great effect on the efficiency of urea removal. The removal of urea increased with the rise of current density and chloride ion concentration. Urea removal rate reached 99.5% at current density of 12 mA/cm² and chloride ion concentration of 400 mg/L by 30 min electrolytic treatment. Due to the high removal rate of urea by electrolysis treatment with no need of electrolyte, electrolytic removal of urea by low-amperage electric current is feasible for swimming pool water treatment.