MgO吸附材料除氟效果对水化学性质的适应性  

Applicability of Defluoridation Effect Under Different Hydrochemical Characters of Porous Magnesium Oxide

作　　者：李连香[1,2] 刘文朝[1,2] 李铁光[1,2] 孙瑞刚[3] 

机构地区：[1]中国灌溉排水发展中心,北京100054 [2]水利部农村饮水安全中心,北京100054 [3]北京市南水北调工程建设委员会办公室,北京100086

出　　处：《中国农村水利水电》2017年第8期127-131,共5页China Rural Water and Hydropower

基　　金：重大水专项<农村饮用水安全保障技术标准化研究及规模化应用示范>(2015ZX07402003)

摘　　要：结合目前吸附法除氟技术所面临的应用难点,以MgO吸附材料为例,基于非天然高氟地下水加氟、天然高氟地下水等水质背景开展相关吸附试验,探究吸附材料对水化学性质的适应性。试验结果表明MgO吸附材料对非高氟地下水和天然高氟地下水均具有适应性,投加量0.3 g/L情况下可将天然高氟地下水中氟化物浓度由3.68 mg/L降至饮用水卫生标准要求的1.0 mg/L以下,具有良好的除氟效果。MgO吸附材料在吸附氟的同时也吸附了大量共存阴离子HCO_3^-和SO_4^(2-),所吸附的差量级共存阴离子降低了吸附材料的可重复利用性能。基于纯水配制高氟水试验条件下的再生手段满足不了实际高氟水再生手段的需求,再生手段不仅仅需考虑脱附F-,更应全面考虑如何脱附HCO_3^-、SO_4^(2-)和Cl^-等阴离子从而释放更多的吸附位点。In order to overcome the current application difficulties,the applicability and defluoridation effect of MgO adsorbent under lowfluoride and high-fluoride groundwater are studied in this paper. Results show that MgO adsorbent possesses good applicability and can remove fluoride below the drinking water standard＇s limit value with low adsorbent dose 0.3 g/L. Meanwhile,MgO adsorbent also adsorbs a lot of coexistence competitive anions,especially bicarbonate and sulfate. These coexistence competition anions have a significant effect on the reused performance of MgO adsorbent. The regeneration method under the condition of deionized water with Na F can hardly satisfy the actual demand of high-fluoride groundwater. As for the regeneration method,it is necessary to consider the desorption and regeneration of fluoride but also the desorption of bicarbonate,sulfate and chloride and thus releasing more adsorption sites.

关 键 词：MGO 高氟地下水 吸附法 氟去除率 竞争吸附 适应性 

分 类 号：TV213.4[水利工程—水文学及水资源] TU991.266[建筑科学—市政工程]