用CARIX工艺处理饮用水的研究

利用呈游离酸型的弱酸阳离子交换树脂和呈重碳酸盐型的阴离子交换树脂组合成混床,从饮用水中联合去除硝酸盐、硫酸盐和硬度。二氧化碳作为再生剂同时再生两种树脂。为提高阴树脂的再生效率,研究了添加剂的种类和最宜加入量。混床与复床的比较表明:混床优于复床,它的产水量达50个床体积以上,再生用水仅需5个床体积。

Improvement of Removing Rate of Nitrate in Drinking Water with the CARIX Process

The paper describes treatment of drinking water using CARIX ion exchange process. The combined application of a weakacid ion exchanger in the free acid from and an anion exchanger in the bicarbonate from provides a combined removal of nitrate, sulfate and hardness from drinking water. Carbon dioxide is used for the si-multaneous regeneration of both resins. In order to improve the regeneration efficiency of nitrate, the application of additives like CaCO3 or MgO has been studied. The dosage of different quantities of MgO has been investigated with respect to an optimization. MgO should be added at the concentrations above 0.4%. Eurthermore, the usual mixed bed was compared with a compound bed, consisting of several short single beds. Under the raw water conditions of the test, over 50 BV of water could be treated, whereas regeneration required about 5 BV of water.