重碳酸盐碱度对电吸附设备除盐性能影响的研究

Study on effect of bicarbonate alkalinity on desalination performance of eletrosorption equipment

为了系统地考察重碳酸盐碱度对电吸附设备除盐性能的影响,利用小型电吸附模块对含有不同重碳酸盐碱度的原水水质进行处理。实验结果表明,随着其含量从170 mg/L增加到400 mg/L,电吸附设备的除盐率明显下降。通过对起始工作电流降低这一变化作理论分析,认为重碳酸盐碱度在电吸附模块内部积存结垢是影响电吸附设备除盐性能的重要原因,并通过实验证实其与钙离子共同作用导致了结垢。

Feed water of different bicarbonate concentrations was treated by an eletrosorption module in order to systematically study the effect of bicarbonate alkalinity on the desalination performance of eletrosorption equipment. The results show that bicarbonate alkalinity has a significant effect on desalination rate, which drops remarkably with increasing the bicarbonate concentration from 170 mg/L to 400 mg/L. Analysis of the decline of initial working current reveals that bicarbonate alkalinity store up and form the scale in the electrosprption module, which is an important reason for affecting desalination rate of electrosorption equipment. It is confirmed that the combined effect of bicarbonate alkalinity and the calcium causes the scale by the experiments.