道南渗析法处理硝酸盐废水研究

Study on Treatment of Nitrate Wastewater by Donnan Dialysis

水体中硝酸盐含量超标,不仅会引起水体水质恶化、削减生物多样性、甚至威胁人体健康。如何安全,简捷的脱除水中硝酸盐是目前水体污染治理研究领域的热点之一。道南渗析是一种利用浓度梯度作为一种驱动力的膜分离技术,具有安全、工艺简便等特点。研究利用道南渗析技术处理硝酸盐废水具有必要性。通过分析处理过程中硝酸盐的渗透通量,系统讨论驱动离子性质、浓度、温度和pH对处理过程的影响。不同参数的单因素实验结果表明,驱动物为氯化钠,溶液pH=7,35℃作为操作条件时,硝酸盐的脱除效果最好。

Excessive nitrate content in water will not only cause water quality deterioration,reduce biodiversity,and even threaten human health.How to remove nitrate safely and simply is one of the hot spots in the field of water pollution control.Donnan dialysis is a kind of membrane separation technology using concentration gradient as a driving force,which has the characteristics of safety and simplicity.It is necessary to study the treatment of nitrogen-containing wastewater by using Donnan dialysis technology.By analyzing the permeation flux of nitrogen compounds in the treatment process,the effects of driving ion properties,driving ion concentration,temperature and pH on the dialysis process were systematically discussed.The results of single factor experiments with different parameters show that the best removal effect of nitrate is obtained at sodium chloride as driving compound at pH 7 and 35℃.