MIEX对水中溴离子的去除效能及其影响因素

利用烧杯试验研究了一种新型磁性离子交换树脂(MIEX)对水中溴离子的去除效能,并考察了水中常见阴离子及有机物对其去除效果的影响.试验结果表明,MIEX可以有效去除纯水中的溴离子,投加量为10 mL/L和20 mL/L时其对溴离子去除率均在90％以上,且达到交换平衡时间分别为5 min和3 min.水中常见的其它带负电物质会在一定程度上影响溴离子的去除效果,在常见的含量条件下10 mL/L的MIEX对溴离子的去除率一般在50％以上.阴离子含量以及MIEX的选择性是影响其对溴离子去除效果的主要因素.有机物的存在使MIEX对溴离子的去除率明显下降,去除率在70％左右.MIEX对有机物、阴离子的去除过程存在差异:10 mL/L的MIEX去除阴离子的反应平衡时间在5 min左右,而去除有机物的平衡时间则较长,其对2种表征有机物含量的指标(UV254、DOC)的去除稳定时间均在20 min以上.

Removal Efficiency and Influence Factors of Bromide in Water by MIEX

Jar-tests were used to study the removal efficiency and influence factors caused by common anions and organic compounds of bromide in water by a new magnetic ion exchange resin （MIEX）. The results show that MIEX can remove bromide in pure water effectively. The removal rates of bromide by MIEX are all over 90 ; when the equilibrium time of ion exchange reaction between MIEX and bromide is 5 min and 3 min and the dosage is 10 mL/L and 20 mL/L, respectively. Even containing other common negatively charged matter which has inhibitory effect to some extent, the removal rates reach 50%. Anionic content and the selectivity of MIEX are the main influence factors to reduce bromide in water by MIEX. The existence of organic compounds decreases the removal rate of bromide in water by MIEX, which is approximately 70%. There are differences between anions and organic compounds in removal processes by MIEX. The equilibrium time of ion exchange reaction removing anions is about 5 min, while it takes over 20 min to remove organic compounds measured with UV254 and DOC, respectively by MIEX with the dosage of 10 mL/L.