大孔阴离子交换树脂去除溴酸盐的研究

发布时间：2018-05-01 01:33

本文选题：大孔阴离子交换树脂 + 吸附　；参考：《湖南大学》2015年硕士论文

【摘要】：随着给水处理技术的发展和人们对饮用水水质的重视,臭氧在饮用水处理中的应用日益广泛,但是近年来的研究表明臭氧消毒会产生许多消毒副产物。如果水体中含有一定浓度的溴离子,经臭氧氧化后将生成副产物溴酸盐,会对人体带来一定的危害。国际癌症研究机构已将溴酸盐定为2B级(较高致癌可能性)的潜在致癌物,我国新修订出台的《生活饮用水卫生标准》(GB5749-2006)明确规定,饮用水中的溴酸盐含量不得超过10μg/L。因此,寻求有效的去除饮用水中经臭氧消毒形成的溴酸盐的方法迫在眉睫。大孔阴离子交换树脂作为一种高效吸附剂在去除氮磷方面取得良好成果,本文以D201大孔阴离子交换树脂为吸附剂,研究了树脂对溴酸盐的静态吸附特征和动态吸附行为。D201大孔阴离子交换树脂去除溴酸盐的静态研究主要包括树脂剂量、反应时间、初始浓度、p H、温度和共存离子等单因素对溴酸盐去除的影响,吸附过程的动力学、热力学和等温线分析,以及饱和树脂的再生研究。静态吸附实验的结果表明:树脂对溴酸盐的去除能力随树脂投加量的增加而增加,树脂对溴酸根的吸附在5个小时左右能够达到吸附平衡,增加初始浓度能加快溴酸根在树脂上的吸附速度,p H值在4.50-9.92范围内,出水溴酸根浓度均能够达到10μg/L以下,温度升高有利于树脂对溴酸根的吸附,共存离子对树脂吸附溴酸根影响的大小符合NO3-SO42-Cl-。动力学数据表明拟一阶动力学(R20.95)能更好的描述溴酸根在树脂上的吸附。树脂对溴酸根的吸附等温线能够用Freundlich和Redlich Peterson模型良好拟合。热力学研究结果显示吉布斯自由能ΔG°0,表明溴酸根在树脂上的吸附是自发的、热力学可行的,焓变值ΔH°0表明溴酸根在树脂上的吸附是一个吸热的过程。饱和树脂经再生五次,仍然有96%的去除效果。此外,本课题还研究了流速、柱高和初始浓度等对D201大孔阴离子交换树脂动态吸附溴酸根离子的影响,采用Thomas模型和Yoon-Nelson模型对溴酸根在D201大孔阴离子交换树脂上的动态吸附行为进行分析。研究表明:较低的流速、适当较高的吸附柱高度和较低的进水浓度,能使树脂对溴酸根有较好的处理效果。采用Thomas模型和Yoon-Nelson模型对D201大孔阴离子交换树脂对溴酸根离子的动态穿透过程进行拟合,拟合的穿透曲线与实验所测的点拟合度较高,拟合的相关系数均在0.98以上,由Thomas模型计算得到的吸附量与实验测得的吸附量存在一定的差距,由Yoon-Nelson模型得到的达到50%吸附的时间与实验测得的时间接近。
[Abstract]:With the development of water treatment technology and the importance of drinking water quality, ozone is widely used in drinking water treatment. However, recent studies show that ozone disinfection can produce many disinfection by-products. If there is a certain concentration of bromine ion in the water body, the by-product bromate will be formed after ozone oxidation, which will bring certain harm to human body. The International Agency for Research on Cancer has designated bromate as a potential carcinogen of Class 2B (higher carcinogenic possibility). The newly revised "Sanitary Standards for drinking Water" (GB5749-2006) clearly stipulates that the content of bromate in drinking water should not exceed 10 渭 g / L. Therefore, it is urgent to seek an effective method to remove bromate formed by ozone disinfection in drinking water. Macroporous anion exchange resin as a high efficiency adsorbent has achieved good results in nitrogen and phosphorus removal. In this paper, D201 macroporous anion exchange resin was used as adsorbent. The static adsorption characteristics and dynamic adsorption behavior of bromate by resin. D201 macroporous anion exchange resin were used to remove bromate. The effects of the initial concentration of pH, temperature and coexisting ions on the removal of bromate, the kinetics, thermodynamics and isotherm analysis of adsorption process, and the regeneration of saturated resin were studied. The results of static adsorption experiments show that the removal capacity of bromate increases with the increase of resin dosage, and the adsorption equilibrium of bromate can be achieved in about 5 hours. Increasing the initial concentration can accelerate the adsorption rate of bromate on the resin in the range of 4.50-9.92, and the bromate concentration in the effluent can reach below 10 渭 g / L, and the increase of temperature is favorable to the adsorption of bromate on the resin. The effect of coexisting ions on the adsorption of bromate on the resin is consistent with that of no _ 3-SO _ 4 _ 2-Cl-. Kinetic data show that pseudo-first-order kinetic R20.95) can better describe the adsorption of bromate on resin. The adsorption isotherms of bromate can be well fitted by Freundlich and Redlich Peterson models. The thermodynamic results show that the Gibbs free energy 螖 G 掳0 shows that the adsorption of bromate on the resin is spontaneous and thermodynamics is feasible. The enthalpy variation 螖 H 掳0 indicates that the adsorption of bromate on the resin is an endothermic process. The saturated resin was regenerated five times, and the removal rate was 96%. In addition, the effects of flow rate, column height and initial concentration on the dynamic adsorption of bromate ion by D201 macroporous anion exchange resin were studied. The dynamic adsorption behavior of bromate on D201 macroporous anion exchange resin was analyzed by Thomas model and Yoon-Nelson model. The results show that lower flow rate, higher adsorption column height and lower influent concentration can make the resin have better treatment effect on bromate. The dynamic penetration process of D201 macroporous anion exchange resin to bromate ion was fitted by Thomas model and Yoon-Nelson model. There is a certain gap between the adsorption amount calculated by Thomas model and that measured by experiment, and the time of 50% adsorption obtained by Yoon-Nelson model is close to the time measured by experiment.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU991.2

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