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.
出处
《水处理技术》
CAS
CSCD
北大核心
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)
