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我国部分地区饮用水源中的硝酸盐污染严重,传统给水处理工艺去除效率低。采用自制大孔型阴离子树脂进行静态和动态实验。结果表明,该离子交换树脂吸附速率由颗粒内扩散速率控制,10 min时达去除总量的50%,30 min达吸附平衡;固定床最佳高径比为20,共存离子影响了NO_3~-的去除,其影响大小为:SO_4~(2-)>Cl~->HCO_3~-;树脂在较高浓度阴离子的干扰下能较好地去除硝酸盐,柱利用率达68.75%~84.65%。负载柱仅消耗18 BV再生液使解吸效率达99%,大大降低了再生液体积和成本。表明该树脂具有良好的选择性和再生性。
In some parts of our country, the nitrate in drinking water sources is seriously polluted, and the traditional feedwater treatment process has low removal efficiency. Self-made macroporous anion resin for static and dynamic experiments. The results showed that the adsorption rate of the ion exchange resin was controlled by the rate of intraparticle diffusion and reached 50% of the total amount at 10 min, and the adsorption equilibrium was reached at 30 min. The optimum height - diameter ratio of the fixed bed was 20 and the coexisting ions affected the NO_3 ~ The removal rate of nitrate is better than that of SO_4 ~ (2 -)> Cl ~ -> HCO_3 ~ -. The resin can remove nitrate well under the interference of higher concentration of anions. The utilization rate of the column is up to 68.75% -84.65%. The load column consumes only 18 BV of regenerant to desorb efficiency of 99%, greatly reducing the regenerant volume and cost. It shows that the resin has good selectivity and regeneration.