用EDI去除高纯水中痕量氨(NH_3和NH_4^+)的新方法

A New Method of Removing Trace Ammonia (NH_3 and NH_4^+) from High Purity Water by Using Electrodeionization

本文研究了用电脱盐(E lectrodeionization)ED I,去除高纯水中痕量氨(NH3和NH4+)的新方法.研究高纯水中弱离子化杂质氨的去除及其机理;研究了电流、进水电导率、进水流量和pH等对ED I去除水中氨(NH3和NH4+)的影响,进水氨浓度为208mg/L,经过一级ED I的处理,产品水中的总氨含量为0.072mg/L,对离子态铵也有很好去除效果,对进水中NH4C l浓度为20mg/L^100mg/L,产品水中铵浓度<0.026mg/L.结果说明这方法是目前处理高纯水中痕量氨最好结果,远远低于太空用水<0.5mg/L的要求.还研究了水中氨在ED I中被去除时的物种形态.

In this paper a new method of removing trace ammonia （NH3 and H4^＋） from high purity water by using electrodeionization （EDI） was studied. The removing of ammonia from high purity water and its mechanism were investigated. The dependence of the effectiveness of removing ammonia （ NH3 and NH4^＋） on electrical current, inlet conductivity,inlet flow rate and pH value was shown. After one EDI treament the total ammonia concentration was decreased from 208mg/L to 0.072mg/L. This method is also effective for removing NH4 ＋ ion from water. After EDI treatment NH4Cl concentration was decreased from 20 ～100mg/L to below 0.026mg/L. This method giving ammonia concentration much less than the required concentration of 〈0.5mg/L for space water proved to be the most effective among other methods for removing trace ammonia in high pure water. The species configuration during removing ammonia from water was also investigated.