高硬度富锶地下水的软化沉淀-超滤膜联用工艺  

Treatment of high hardness and strontium-rich groundwater by chemical softening-ultrafiltration process

作　　者：徐文博[1,2] 王东升[2] 段晋明[1] 徐绪筝[2] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055 [2]中国科学院生态环境研究中心环境水质学国家重点实验室,北京100085

出　　处：《环境工程学报》2012年第10期3443-3448,共6页Chinese Journal of Environmental Engineering

基　　金：国家"973"项目(2011CB933704);国家自然科学基金资助项目(51008293;51025830)

摘　　要：针对一种高硬度富锶地下水,分别采用石灰和石灰-碳酸钠两种方法,利用药剂软化/超滤膜工艺对其进行软化处理,同时考察了药剂投量对出水锶含量的影响。结果表明,采用石灰软化/超滤膜法,Ca(OH)2最佳投加量为270 mg/L时,出水总硬度(以CaCO3计)由287.12 mg/L降低到96.44 mg/L,硬度去除率为66.41%,出水锶含量也由原水中的0.37 mg/L下降为0.21 mg/L;而采用石灰-碳酸钠软化/超滤膜法,Ca(OH)2和Na2CO3最佳投加量分别为270 mg/L、160mg/L时,出水总硬度降低到60.34 mg/L,硬度去除率达78.98%,锶含量仅为0.02 mg/L。2种处理方法出水总硬度均达到预期目标,石灰软化/超滤膜法可使出水锶含量满足富锶水的要求,而石灰-碳酸钠软化/超滤膜法则造成了对人体有益微量元素锶的大量损失。Chemical softening-ultrafiltration processes with lime or lime-sodium carbonate composite as the softening agents were investigated on the treatment of high hardness and strontium-rich groundwater,and the effects of chemical dosage on the strontium content in the effluents were studied.The results showed that the total hardness was reduced from 287.12 mg/L to 96.44 mg/L with its removal of 66.41% and strontium content in the effluent was from 0.37 mg/L to 0.21 mg/L at the optimal dosage of 270 mg/L Ca（OH）2,while for the lime-sodium carbonate method the total hardness was 60.34 mg/L with 78.98% of the removal and strontium content was 0.02 mg/L at the optimal dosage of 270 mg/L Ca（OH）2 and 160 mg/L Na2CO3.Both the lime and lime-sodium carbonate composite methods by the chemical softening/ultrafiltration process can get the effluent total hardness to the requirement for groundwater softening treatment.The effluents by the lime softening/ultrafiltration method still maintain its high-level content of trace strontium,which is beneficial to man＇s health and makes them suitable for the quality of strontium-rich mineral water,whereas a great loss of trace strontium in the groundwater was resulted in by the lime-sodium carbonate composite softening/ultrafiltration method.

关 键 词：锶含量 超滤膜 药剂软化 高硬度富锶地下水 

分 类 号：X703[环境科学与工程—环境工程]