摘要
为去除高盐废水中的钙、镁离子及二氧化硅,降低对后续膜工艺和蒸发工艺的影响,研究了含盐量、反应pH、对高盐废水中钙、镁离子及二氧化硅的去除效果的影响,验证了除硬和除硅的路线.研究表明:在投加碳酸钠和氯化镁时,pH对除硬除硅反应影响明显,且在pH≥11时,可以同步将钙镁硅降至较低水平.另外,随着含盐量上升盐效应明显,钙镁硅离子的去除率逐渐降低,尤其对钙离子的去除影响最为明显,继续提升 pH也并不能大幅提升钙镁硅离子的去除率.
Abstract
In order to remove calcium ions,magnesium ions and silicon dioxide in high-salt wastewater and reduce the impact on the subsequent membrane process and evaporation process,the effects of salt content,reaction pH,and removal of calcium,magnesium ions and silicon dioxide in high-salt wastewater are studied.The results show that when sodium carbonate and magnesium chloride are added,the pH has a significant effect on the reaction of hardness and silicon removal,and when the pH is no less than 11,the calcium,magnesium and silicon can be reduced to a lower level simultaneously.In addition,as the salt content increases,the salt effect becomes significant,and the removal rate of calcium,magnesium,and silicon ions gradually decreases.In addition,as the salt content increases,the salt effect becomes significant,and the removal rate of calcium,magnesium,and silicon ions gradually declines,and the removal rate of calcium ions drops the most;Continuing to increase the pH does not significantly improve the removal rate of the three kinds of ions.
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