摘要
煤层气开采过程中产生了大量的高氟废水,对区域水环境和水生态安全造成了巨大风险。为解决煤层气气井含氟废水超标排放对环境造成的影响,有必要选择一种成本低、效果好且易操作的煤层气气井排水脱氟方法。分别采用工程实践中最常用的几种除氟方法,即化学沉淀法(钙盐、钙盐-磷酸盐)、絮凝沉淀法(活性铝盐)、絮凝-化学沉淀法(钙盐-磷酸盐-活性铝盐)和吸附法(树脂),开展了煤层气气井排水中氟的去除试验,对比研究了不同除氟方法对煤层气气井排水中氟的去除效率和脱氟机理。结果表明:铝盐絮凝沉淀法脱氟技术能使气井排水中氟浓度达到农田灌溉用水标准;絮凝-化学沉淀法脱氟技术能使气井排水中氟浓度达到地下水Ⅲ类水质标准;树脂吸附法脱氟技术对气井排水中氟具有最高的去除效率,氟的去除率达到了97.5%,但存在吸附穿透时间短的缺点。
Discharge of high-fluorine Coal-bed Methane(CBM)drainage yields high risks to regional water environment and water ecological security.To solve the problem,a low-cost,efficient,and easily operated treatment process must be selected to defluorinate the wastewater.In this paper,defluorination experiments were carried out with chemical precipitation(calcium salt,calcium salt-phosphate),flocculation-chemical precipitation(calcium salt-phosphate-aluminum salt),adsorption(resin),flocculation(aluminum salt)to comparatively study the defluorination efficiency and mechanism.The results show that(1)aluminum salt flocculation method can make the fluoride concentration of CBM drainage reach the Irrigation Water Standard;(2)flocculation-chemical precipitation method can make the fluoride concentration of CBM drainage reach the gradeⅢgroundwater quality standards;(3)resin adsorption method,with the removal rate reaching 97.5%,has the highest defluorination efficiency for CBM drainage,but it has the disadvantage of short penetration time.
作者
杨欣雯
罗猛
李慧清
王宇飞
李成城
冯彩宁
贾小军
张松涛
张建友
高旭波
YANG Xinwen;LUO Meng;LI Huiqing;WANG Yufei;LI Chengcheng;FENG Caining;JIA Xiaojun;ZHANG Songtao;ZHANG Jianyou;GAO Xubo(School of Environmental Studies,China University of Geosciences(Wuhan),Wuhan 430078,China;Water Conservancy Bureau of Jincheng City,Shanxi Province,Jincheng 048026,China;Jincheng Keshui Conservancy Technology Consulting Co.Ltd.,Jincheng 048000,China;Linfen Hydrology and Water Resources Prospecting Station,Linfen 041000,China;Water Resources Management Office,Shanxi Water Resources Development Center,Taiyuan 030001,China;Shanxi Water Resources Research Institute Co.,Ltd.,Taiyuan 030001,China)
出处
《安全与环境工程》
CAS
CSCD
北大核心
2021年第3期87-93,161,共8页
Safety and Environmental Engineering
基金
国家自然科学基金项目(41877204、41902265)
中国博士后科学基金项目(2018M642944)。
关键词
煤层气气井排水
脱氟
化学沉淀法
絮凝沉淀法
树脂吸附法
Coal-Bed Methane(CBM)drainage
defluorination
chemical precipitation
flocculation
resin adsorption
