石灰软化——超滤工艺处理高硬度地下水探讨

Study of lime softening-ultrafiltration process for groundwater hardness treatment

针对北方某地下水暂时性硬度较高的问题,通过小试和中试,考察研究石灰-超滤组合工艺处理高硬度地下水技术的可行性和运行的稳定性。研究表明,原水中投加Ca(OH)_(2)可以通过沉淀法去除水中的暂时性硬度,再采用超滤过滤可以达到较好的固液分离效果,中试出水浊度低于0.2 NTU,硬度低于380 mg/L;中试系统的连续运行表明石灰-超滤组合工艺具有运行稳定、能耗低和易于实施的优点。

For the treatment of high transient hardness in north city groundwater,laboratory and pilot tests were carried out and the feasibility of lime softening and ultrafiltration processing for groundwater hardness treatment was studied in this research.The results showed that the transient hardness could be reduced with the sedimentation after Ca(OH)_(2)softening.A good solid-liquid separation would be realized with ultrafiltration:the turbidity and hardness of pilot test effluent was low than 0.2 NTU and 380 mg/L separately.After the continuous operation of pilot test,the advantages of lime softening and ultrafiltration processing such as stability,low energy consumption and convenience were proved.Therefore,the combination of lime softening and ultrafiltration would be the new direction for the treatment of groundwater transient hardness treatment.