基于阴离子粘土去除地热水中多种有害组分  

Removing Harmful Constituents from Geothermal Water Using Selected Anion Clays

作　　者：余正艳 曹耀武 郭清海[1] YU Zhengyan;CAO Yaowu;GUO Qinghai(State Key Laboratory of Bio-geology and Environmental Geology and School of Environmental Studies, China University of Geosciences, Wuhan 430074, Chin)

机构地区：[1]中国地质大学(武汉)生物地质与环境地质国家重点实验室&环境学院,湖北武汉430074

出　　处：《环境科学与技术》2018年第3期109-117,共9页Environmental Science & Technology

基　　金：国家自然科学基金项目(41572335);"生物地质与环境地质"国家重点实验室自主研究课题(GBL11505)

摘　　要：利用一种以阴离子粘土(焙烧后水铝钙石、水氯铁镁石、水滑石)为填充材料的净水反应柱,对云南龙陵邦腊掌水热区大沸泉中的氟、砷、硼等多种有害组分进行动态吸附实验,寻找去除效果最佳的阴离子粘土类型及配比,使其达到生活饮用水卫生标准;分析地热水中其它阴离子间的竞争吸附作用和对氟、砷、硼去除效率的影响;并探究柱实验去除效果的影响因素。实验结果表明:反应柱填充材料的最佳阴离子粘土配比为水铝钙石∶水氯铁镁石∶水滑石=20.0 g∶1.5 g∶10.0 g,反应后氟、砷、硼的去除率均可达88%以上,且达到饮用水标准;地热水中的SO_4^(2-)、HCO_3^-/CO_3~2-表现出较强的阴离子间竞争吸附能力,可大大降低阴离子粘土对氟、砷、硼的去除效率;反应柱的净水效果受渗流速率和反应柱尺寸等因素的影响,净水渗流速率越小和渗流长度越长,净水效果越好。A bench scale experiment was conducted using glass column filled with anion clay as a kind of adsorbent to remove harmful constituents such as fluoride, arsenate and boron from the geothermal water collected from Banglazhang hot spring located in Longling County, Yunnan Province. The anion clay made of calcined hydrocalumite, iowaite and hydrotalcite with different proportions was used in the dynamic adsorption column experiment to determine the best proportion,with which the geothermal water was percolated going through the adsorption to meet the standard for drinking water quality, and the effects of competitive sorption of other anions in the geothermal water on removal rate of harmful anion constituents, e.g. fluoride, arsenate and boron, were investigated. The experimental results suggested that the best outcome in removing harmful constituents from the geothermal water was achieved when the ratio of calcined hydrocalumite∶iowaite∶hydrotalcite equaled to 20.0 g∶1.5 g∶10.0 g; and the removal rate of anions： fluoride, arsenate and boron, can reach up to 88%, being complied with the standards for drinking water quality. However, the stronger competivity of other anions such as SO42-and SO4^（2-）、HCO3^-/CO3~2-might considerably weaken the effects of removing harmful constituents in the geothermal water. The influence factors including seepage rate and the size of the column were evaluated,the smaller the seepage rate and the longer the length of the seepage route, the better the removal effects.

关 键 词：阴离子粘土 地热水 柱实验 竞争吸附 

分 类 号：X703[环境科学与工程—环境工程]