电化学氧化法去除微污染水中的氨氮
Removal of ammonia from micro-polluted water by electrochemical oxidation process
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摘要: 以低氯离子浓度下微污染水中的氨氮(NH+4-N)为研究对象,采用电化学氧化法对污染水中的氨氮进行去除。通过静态和正交实验得到了极板的最佳运行参数。实验结果表明: Cl-浓度在各影响因素中对NH+4-N去除影响最大,且在其他影响因素不变的条件下,通过改变电解电流是解决动态运行时NH+4-N去除率下降较经济有效的方法。最佳运行工艺条件为:电流密度10 mA/cm2,电解时间10 min,极板间距1 cm,溶液初始pH为7,Cl-浓度100 mg/L,面体比102 m2/m3,氨氮的平均去除率在80%以上。Abstract: Taking the micro-polluted raw water with low chloride ion concentration as the object, electrochemical oxidation process was adopted for NH+4-N removal. Through the static and orthogonal test, the optimal operating parameters were obtained. The results showed that Cl-made the greatest impact on the ammonia removal in all of the factors, and the more cost-effective method for preventing decrease of ammonia removal efficiency was changing the electrolytic current when the conditions of the other factors were fixed. The optimal reaction conditions were as follows : current density was 10 mA/cm2, HRT was 10 min, the plate spacing was 1 cm, initial solution pH was 7, Cl- concentration was 100 mg / L, the ratio of area and volume was 102 m2/m3 , the average removal rate of ammonia was 80%.
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Key words:
- electrochemical oxidation /
- ammonia /
- optimal operating parameters /
- micro-polluted water
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