Impact of a magnetic ion exchange resin on ozone demand and bromate formation during drinking water treatment.
Impact of a magnetic ion exchange resin on ozone demand and bromate formation during drinking water treatment.
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DOI：
10.1016/j.watres.2004.06.021
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发表时间：
2003-12
期刊：
影响因子：
12.8
通讯作者：
C. J. Johnson;P. Singer
中科院分区：
文献类型：
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作者：
C. J. Johnson;P. Singer
这项研究的目的是考察磁性离子交换树脂(MIEX®)对实验室规模的两种不同臭氧氧化水中臭氧需求和溴酸盐生成的影响。第一批原水的溴离子浓度高，臭氧需求量高，颜色也很高。根据第一个水的实验结果，选择第二个水作为模型水，在其中进行了更多的控制实验。根据紫外线(UV)吸收物质、溶解有机碳(DOC)和溴化物的去除情况，使用MIEX树脂通过JAR测试程序对水进行处理，以找到最佳的MIEX用量。选择了最佳树脂投加量，用于MIEX的整体处理和随后的臭氧氧化。分析了MIEX预处理水的臭氧需要量和溴酸盐生成随臭氧投加量和溶解臭氧浓度的变化规律，并与未经MIEX预处理水进行臭氧氧化处理的结果进行了比较。结果表明，用MIEX树脂对水进行预处理后，总有机碳、DOC、紫外吸光度、色度显著降低，并在一定程度上降低了溴化物的含量。MIEX在臭氧氧化之前对水进行的预处理大大降低了臭氧需求和随后臭氧氧化过程中溴酸盐的形成。
The objective of this research was to examine the impact of a magnetic ion exchange resin (MIEX®) on ozone demand and bromate formation in two different ozonated waters at bench scale. The first raw water had a high bromide ion concentration, a high ozone demand, and was highly colored. Based on experimental findings from the first water, the second water was selected as a model water in which more controlled experiments were performed. The waters were treated with the MIEX resin using jar test procedures to find the optimal MIEX dosage based upon the removal of ultraviolet (UV)-absorbing substances, dissolved organic carbon (DOC), and bromide. The optimal resin dosage was chosen for bulk MIEX treatment and subsequent ozonation in a semi-batch reactor. The ozone demand and formation of bromate were analyzed as a function of ozone dosage and dissolved ozone concentration for the MIEX pre-treated water, and compared to the results obtained by ozonating the water without MIEX pre-treatment. The results indicate that pre-treatment of the water with the MIEX resin significantly reduces total organic carbon, DOC, UV absorbance, color, and to some extent, bromide. MIEX pre-treatment of the water prior to ozonation substantially lowered the ozone demand and formation of bromate during subsequent ozonation.