电吸附技术处理高硬度高碱度废水的中试研究

以乌鲁木齐高新区北区再生水厂的出水作为原水,在不同重碳酸盐碱度(HCO3-)和不同总硬度的进水条件下,研究了电吸附设备对TDS、氯离子、总硬度和HCO3-的去除效果。结果表明,在进水HCO3-浓度为80mg/L,总硬度分别为340,770和1 200mg/L条件下,电吸附设备连续运行6个周期,除HCO3-外,设备对TDS、氯离子、总硬度的去除率较为稳定,当进水HCO3-浓度增加到440mg/L时,4项指标去除率均呈现逐渐下降趋势,且总硬度越高,TDS、氯化物和HCO3-的去除率下降越明显。分析认为电吸附设备在高重碳酸盐碱度进水条件下运行时,HCO3-与钙等硬度离子相互作用,导致电极板结垢,从而影了设备的脱盐效果。

Research on Treatment of High Hardness and Alkalinity Wastewater by Electrosorption Technology

This research was conducted to investigate the removal effect of eletrosorption equipment of TDS,chloridion,total hardness and HCO-3,under different conditions of bicarbonate alkalinity and total hardness by using the influent from reclaimed waterworks in the north of high and new tech zone in Urumqi City as raw water.The result indicated that when the concentration of influent HCO-3 was 80 mg/L,the total hardness was respectively 340,770 and 1 200 mg/L,electrosorption equipment continuously were operated in 6 cycles,except for HCO-3,removal rate of TDS,chloride and total hardness were more stable.When the influent HCO-3 concentration increasd by 440 mg/L,the removal rate of the above four were decreased gradually,the higher the total hardness,the more obviously the removal rate of TDS,chloride and HCO-3 increased.It was analyzed that when the electrosorption equipment was operated under the conditions of influent of high bicarbornate alkalinity,HCO-3 and calcium and other hardness ions will act on one another,which resulted in scaling of eletrode plate,thus affecting the desalting effect of electrosorption equipment.