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首页> 外文期刊>Separation and Purification Technology >Electrodialytic removal of fluoride from water:Effects of process parameters and accompanying anions
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Electrodialytic removal of fluoride from water:Effects of process parameters and accompanying anions

机译：电渗析去除水中氟化物：工艺参数和伴随阴离子的影响

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The removal of fluoride from water by using electrodialysis with SB-6407 anion exchange membrane was tested at different current densities.After the determination of the optimum pH of feed phase under Don-nan dialysis condition which gave the maximum transport of fluoride,the effect of mono-and bi-valent ions,such as chloride and sulphate,in the feed phase on the removal was investigated by electrodialysis.The transport of fluoride was also correlated with the flux data and explained according to structure of membrane.It was found that the removal of fluoride was higher in the absence of mono-and bi-valent ions.The reducing effect of sulphate ions on the transport of fluoride was higher than that of chloride ions,which was explained by considering interaction of both chloride and sulphate ions with the ionic group in the membrane and activity coefficient of fluoride in the presence of mono-and bi-valent ion set.Moreover,transport of fluoride increased with increasing current density and feed phase concentration.As the driving ion,the chloride ion is more efficient than the sulfate ion.Application of electrodialysis was carried out on the real water containing 20.6 mg/L of fluoride.Despite the presence of chloride and sulphate in real water sample,fluoride concentration could be reduced to 0.8 mg/L(96% removal),which was lower than World Health Organization(WHO)standard(1.5 mg/L).
机译：在不同的电流密度下，用SB-6407阴离子交换膜进行电渗析测试了水中氟的去除。在Don-nan渗析条件下确定进料相的最佳pH值后，氟的最大迁移率得到了最佳效果。通过电渗析研究了进料相中一价和二价离子，如氯离子和硫酸根。氟化物的迁移也与通量数据相关，并根据膜的结构进行了解释。在不存在一价和二价离子的情况下，氟离子的去除率更高。硫酸根离子对氟离子迁移的还原作用要比氯离子高，这可以通过考虑氯离子和硫酸根离子与氟离子的相互作用来解释。存在单价和二价离子对时，膜中的离子基团和氟化物的活度系数。此外，氟化物的传输随着电流密度的增加而增加。 d进料相浓度。作为驱动离子，氯离子比硫酸根离子更有效。电渗析是在含20.6 mg / L氟化物的真实水中进行的，尽管真实水样品中存在氯化物和硫酸盐，氟化物浓度可降至0.8 mg / L（去除率96％），低于世界卫生组织（WHO）的标准（1.5 mg / L）。

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