| 含溴水臭氧化过程阴离子对溴酸盐生成的影响 |
| 摘要点击 2308 全文点击 1506 投稿时间：2015-02-05 修订日期：2015-04-15 |
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| 中文关键词 含溴水 臭氧氧化 溴酸盐 氯离子 碳酸氢根离子 硫酸根离子 |
| 英文关键词 bromide-containing water ozonation bromate chloride ion bicarbonate ion sulfate ion |
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| 中文摘要 |
| 为研究常见无机阴离子对含溴水臭氧化过程溴酸盐(BrO3-)生成的影响,本研究通过小试分别考察了不同质量浓度氯离子(Cl-)、碳酸氢根离子(HCO3-)和硫酸根离子(SO42-)对BrO3-生成的影响,并结合反应过程臭氧衰减、中间产物次溴酸/次溴酸根离子(HOBr/OBr-)生成及总溴浓度变化情况,进一步分析了这3种无机阴离子对BrO3-生成的影响机制. 结果表明,以60 min为例,Cl-质量浓度为3~150 mg ·L-1的水样BrO3-生成量相对于未投加Cl-条件降低了8.8%~25.7%; 反应20 min时,SO42-质量浓度从0 mg ·L-1增至30 mg ·L-1时,BrO3-生成量减少了63.9%; 而当HCO3-质量浓度由0 mg ·L-1上升至30 mg ·L-1时,BrO3-生成量增加了6.4倍,其质量浓度超过30 mg ·L-1,继续投加HCO3-对BrO3-生成量的促进作用提高不大. 研究表明,在相同的臭氧投加量和相同的反应时间下,投加Cl-和SO42-均能抑制臭氧化过程BrO3-的生成,而投加HCO3-能极大地促进BrO3-的生成. |
| 英文摘要 |
| To study the effects of common inorganic anions on bromate formation during ozonation of bromide-containing water, the effects of different mass concentrations of Cl-, HCO3-, and SO42- on bromate formation were investigated in bench-scale test. The mechanisms of these three coexisting anions on bromate formation was analyzed based on the ozone decomposition, HOBr/OBr- formation, and transformation of total bromine species. Our results showed that adding of 3-150 mg ·L-1 Cl- can reduce 8.8%-25.7% of bromate formation within 60 min. 63.9% of bromate would be decreased by increasing SO42- concentration from 0 mg ·L-1 to 30 mg ·L-1 within 20 min. However, more than 6.4 times the mass concentrations of bromate were formed as HCO3- mass concentrations increased from 0 mg ·L-1 to 30 mg ·L-1 within 20 min. The production of bromate was slightly increased when HCO3- mass concentrations was above 30 mg ·L-1. Under the condition of the same ozone dosage and reaction time, adding of Cl- and SO42- will inhibit the formation of bromate during ozonation, while adding of HCO3- significantly will increase the production of bromate. |
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