电化学氧化法处理高浓度氨氮废水的研究

采用间歇试验的方法对电化学氧化处理模拟高浓度氨氮废水的影响因素进行研究。分别考察了电流密度、极板间距、氯离子浓度、反应初始pH值对氨氮和总氮去除率的影响。试验结果表明,电化学氧化法去除氨氮和总氮的最佳电流密度为80mA/cm2,极板间距为30mm,氯离子质量浓度为7000mg/L,pH值为9～11。在上述条件下,反应7h,总氮的质量浓度从3000mg/L降到379.4mg/L,去除率达到87.35%。电化学氧化法对总氮的去除基本符合一级反应动力学规律。

Treatment of wastewater containing high concentration ammonia-nitrogen by electrochemical oxidation process

The simulant wastewater containinghigh concentration ammonia-nitrogen was treated by electro-chemical oxidation process in the intermittent experiment.The influences of different factors including current density,plate distance,chloride ion concentration and initial pH on ammonia-nitrogen and total nitrogen removal were studied.According to the results of the test,the optimal reaction condition was determined as follows:current density was 80mA/cm2,plate distance was 30mm,chloride ion concentration was 7000mg/L and original pH was 9-11.Under the above condition,the total nitrogen concentration reduced from 3000mg/L to 379.4mg/L when the reaction time was 7h,and the removal rate reached 87.35%.The process of total nitrogen removal by electroche-mical oxidation was basically in accord with the first order kinetics law.