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 UV 254 and DOC, respectively by MIEX with the dosage of 10 mL/L.     

以超滤为核心的一体化净水工艺对比试验研究

采用以超滤为核心的一体化工艺处理长江水。试验结果表明,MIEX—UF工艺对耗氧量和UV254的去除率为39．41％和48．78％,PAC-UF工艺的去除率为30．59％和31．71％。MIEX与PAC对水中亲水性有机物的去除率分别为45．74％和67．76％。同时,MIEX可去除56．49％强疏水性有机物,降低了这部分有机物造成的膜污染,而PAC对疏水性物质的去除率很低。两种一体化工艺都能有效去除消毒副产物,出水浊度为0．08NTU,色度为5度,未检出细菌。MIEX和PAC的预处理都可降低天然有机物引起的膜污染,MIEX缓解膜污染的效果优于PAC。