针对硬度低而硝酸盐含量高的原水,采用阴离子交换柱研究了用改进型CARⅨ工艺提高对地下水中硝酸盐的去除。除盐过程中,水中硝酸根和硫酸根等阴离子被碳酸氢根离子置换;再生阶段,用二氧化碳和氧化镁粉末,使树脂转变为重碳酸盐型。结果表明,再生时加入氧化镁粉末能明显改善阴树脂的再生效率,最佳投加量为0.45%。本树脂再生后硝酸盐去除率能达到50%以上。 For raw water with low hardness and high nitrate content, anion exchange columns were used to study the improvement of nitrate removal in groundwater using an improved CARIX process. During the desalting process, the anions in the water, such as nitrate and sulfate, are replaced by bicarbonate ions; in the regeneration stage, carbon dioxide and magnesium oxide powder are used to convert the resin to bicarbonate. The results show that the addition of magnesium oxide powder during regeneration can significantly improve the regeneration efficiency of the anion resin, and the optimal dosage is 0.45%. After the regeneration of the resin, the nitrate removal rate can reach more than 50%.