一种自制选择性离子交换树脂脱除饮用水中的硝酸盐  

Removing Nitrate From Drinking Water by a Self-Made Selective Anion Resin

作　　者：朱菁[1] 任勇翔[1] 叶媛媛[1] 胡轲 

机构地区：[1]西安建筑科技大学,西北水资源与环境生态教育部重点实验室,陕西西安710055

出　　处：《水处理技术》2016年第1期26-30,共5页Technology of Water Treatment

基　　金：国家“水体污染控制与治理”科技重大专项(2014ZX07305002)

摘　　要：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。Nitrate pollution in the sources of drinking water has been serious in some regions of China, while it cannot be effectively removed by traditional water supply treatment process. A self-made selective macroporous anion resin was synthesized. The results of batch and column adsorption experiments showed that the adsorption rate of anion resin was controlled by intra-particle diffusion. A half of nitrate could be removed in 10 min, and the adsorption equilibrium could be reached in 30 min. The optimal H/D ratio was 20 and the nitrate removal was strongly affected by competing anions, and the order of the influence of them on nitrate adsorption to the synthesized resin was: SO_4^(2-)>Cl^->HCO_3^-. Even with the relative high concentration of competing anions, the utilization rate of adsorption column could reach 68.75% to 84.65%. The volume and cost of regeneration could be significantly decreased since 99% of desorption efficiency had been obtained with 18 BV of regeneration salt elution solution, indicating that the anion exchange resin had excellent selectivity and reproducibility for nitrate adsorption.

关 键 词：离子交换树脂 硝酸盐 选择性 再生 

分 类 号：TQ028.8[化学工程] X703.1[环境科学与工程—环境工程]