用EDI去除高纯水中痕量氨的新方法

本文研究了用电脱盐(Electrodeionization) EDI,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EDI去除水中氨(NH₃和NH₄⁺)的影响,进水氨浓度为208mg/L,经过一级EDI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NH₄Cl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EDI中被去除时的物种形态.

A New Method of Removing Trace Ammonia ( NH3 and NH4+ ) from High Purity Water by Using Electrodeionization

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.