摘要：

采用硼掺杂金刚石(BDD)膜电极对氨氮废水进行处理,重点探讨了氨氮的氧化机理。结果表明:碱性条件下,氨氮在BDD电极上可直接氧化,其氧化率达6%。在氯离子存在条件下,氨氮氧化以间接氧化为主,氨氮去除率可达到87%,其中直接氧化率为8%,间接氧化率为79%,且在氧化过程中活性游离氯更易与氨氮发生反应,转化为N₂或硝酸盐,而不是转化为氯酸盐或有害的高氯酸盐。

关键词: 氨氮, 硼掺杂金刚石膜电极, 氧化

Abstract:

Boro-doped diamond(BDD) film electrodes have been used for the treatment of ammonia nitrogen wastewater,and the oxidation mechanism of ammonia nitrogen is investigated emphatically. The results show that under alkaline condition,ammonia nitrogen can be directly oxidized on the BDD electrodes with an oxidation rate of 6%. In the presence of chloride,ammonia nitrogen oxidation is mainly indirect oxidation,and the ammonia nitrogen removing rate can reach 87%,whose direct oxidation rate is 8% and indirect oxidation rate 79%. And,in the process of oxidation,the active free chlorine is more likely to react with ammonia nitrogen, and convert into N₂ or nitrate,rather than into chlorate or harmful perchlorate.

Key words: ammonia nitrogen, boro-doped diamond film electrode, oxidation

中图分类号: 

• X703.1