摘要
对EDI去除弱电解质(CO2、SiO2)的影响因素进行了试验研究,探讨了其去除机理。结果表明:进水电导率增大和弱电解质含量增加都会降低EDI对弱电解质的去除率;进水CO2含量对产水电导率影响较大,当CO2含量增加到10mg/L以上时EDI产水电导率会急剧上升;只有严格控制进水电导率(电导率<40μS/cm)和弱电解质浓度(CO2<10mg/L,SiO2<1mg/L),才可能获得较高的产水质量和弱电解质去除率;在一定范围内,提高进水pH值、增大操作电流和减小产水流量,有利于弱电解质的去除。
Electrodeionization (EDI) technology was used to remove the weak electrolyte, and the affecting factors were studied and the removal mechanism was discussed. It is showed that increase of influent conductivity and weak electrolyte content will result in the decrease of weak electrolyte removal rate. The influent CO_2 concentration has great influence on the conductivity of the finished water, when it is increased to above 10 mg/L, the conductivity of the finished water rises sharply. Only if the influent conductivity is controlled at <40 μS/cm and the weak electrolyte controlled at CO_2<10 mg/L and SiO_2<1 mg/L, can the higher finished water quality and the optimal removal rate of weak electrolyte be achieved. To raise influent pH, increase operational electric current, and decrease finished water flow rate to some extent will be beneficial to the removal of weak electrolyte. 电去离子EDI技术是用于生产高(超)纯水的 新型膜分离技术,与离子交换相比,它具有能连续运 行、出水水质稳定、无需化学药剂再生等优点[1、2]。 也有资料报道EDI更大的优点是对一般工艺较难
出处
《中国给水排水》
CAS
CSCD
北大核心
2005年第7期39-42,共4页
China Water & Wastewater
基金
国家自然科学基金资助项目(50448017)
河北省2004攻关指导计划项目(04213032)收稿日期:2005-03-18
关键词
电去离子
弱电解质
电再生
影响因素
electrodeionization
weak electrolyte
electric regeneration
affecting factor
