改性普鲁兰对氟离子与磷酸盐在固定床反应器中竞争吸附过程的研究

发布时间：2018-05-23 11:45

  本文选题：MgOP + 固定床反应器　； 参考：《华中科技大学》2015年硕士论文

【摘要】：很多工艺产生的废水会同时含有高浓度的氟和磷。氟在饮用水中浓度的浓度过高时会极大的危害人体健康,中国是世界上受氟中毒影响最严重的国家之一,磷在工业、农业中均有较广泛的应用,但磷的过量存在使水体中藻类大量繁殖,减少水中溶氧量,降低水质。吸附法具有成本低、效率高、操作简单等优点,前期研究中发现,改性普鲁兰吸附剂对氟离子和磷酸盐均有较好的吸附效果,本课题在前期静态实验研究的基础上,使用改性普鲁兰吸附剂(MgOP)在动态反应器中对含有氟离子和磷酸盐的模拟废水进行处理,探讨动态竞争吸附行为与影响条件。本课题利用固定床作为反应装置进行竞争吸附的动态实验,考察了床层质量、运行流量、运行温度、初始氟离子浓度、初始磷酸盐浓度、其他阴离子共存和初始pH对氟离子、磷酸盐穿透曲线,以及总吸附过程的影响。结果表明:系统对环境条件的适应性很强,运行温度对穿透曲线的影响不明显,在室温25℃下即可达到最佳处理效果,初始离子浓度对穿透曲线的影响小于单独吸附,系统能够适应10 20mg/L的初始离子浓度,氟离子与磷酸盐浓度比为1:1时达到最佳处理效果,初始pH影响较大,当进水为酸性和碱性时均能取得最佳的处理效果,当初始pH=4时,出水接近中性;运行参数对穿透曲线的影响较大,床层质量越高,运行流速越慢,处理效果越好,最佳床层质量6g,运行流速8m L/min;竞争吸附过程中,两种离子的穿透曲线十分相似,在固定情况下,磷酸盐的饱和吸附量更大,穿透时间和吸附饱和时间更长,吸附剂消耗率更小,竞争吸附中磷酸盐更占优势,但磷酸盐在吸附过程中受两种离子的竞争作用影响更大。本文还对竞争吸附过程中氟离子和磷酸盐的穿透曲线用数学模型进行拟合,结果表明:Thomas模型能较准确的计算出饱和吸附量,Yan模型对饱和吸附量的预测结果远小于实测值;但Thomas模型对氟和磷穿透曲线的拟合结果差于Yan模型。数学模型对竞争吸附过程中氟/磷穿透曲线的拟合结果与单独对氟/磷吸附时相似。
[Abstract]:Wastewater from many processes can contain high concentrations of fluorine and phosphorus at the same time. If the concentration of fluorine in drinking water is too high, it will do great harm to human health. China is one of the countries most seriously affected by fluorosis in the world. Phosphorus is widely used in industry and agriculture. But excessive phosphorus makes algae multiply in water, reduce dissolved oxygen in water and reduce water quality. The adsorption method has the advantages of low cost, high efficiency, simple operation and so on. In the previous study, it was found that the modified Pluran adsorbent had better adsorption effect on fluoride ion and phosphate. The simulated wastewater containing fluorine ion and phosphate was treated in a dynamic reactor with modified Pluran adsorbent MgOP.The dynamic competitive adsorption behavior and influence conditions were discussed. In this paper, the dynamic experiment of competitive adsorption was carried out with a fixed bed as a reaction device. The bed mass, running flow rate, operating temperature, initial fluorine ion concentration, initial phosphate concentration, coexistence of other anions and initial pH for fluorine ion were investigated. The phosphate penetration curve and the effect of the total adsorption process. The results show that the system has a strong adaptability to environmental conditions, and the effect of operating temperature on the penetration curve is not obvious. The optimum treatment effect can be achieved at 25 鈩，

本文编号：1924591