长江中游某高氟地下水除氟试验研究

Removal of Fluoride in Underground Water From Middle Reaches Area of the Yangtze River

长江中游某地下水氟质量浓度为2~4mg/L,不满足饮用水源要求。研究了用活性氧化铝作除氟剂,从此地下水中除氟,考察了活性氧化铝加入量、吸附时间、吸附温度、地下水pH对除氟效果的影响。结果表明:对氟质量浓度2.53mg/L的原水,在粒度为φ1~2mm氧化铝用量24g/L、吸附温度20℃、吸附时间2h静态吸附条件下,水中氟质量浓度可降至0.90mg/L,氟去除率为64.43%;在原水流速5BV/h、20℃、通水量190BV动态吸附条件下,出水F-平均质量浓度为0.70mg/L,氟质量浓度符合饮用水标准(GB 5749—2006)要求。

In the middle reaches area of the Yangtze River,fluoride content in underground water was 2~4mg/L,which exceeded the impurity ion content requirements of the source of drinking water.Activated Al2O3 was selected as defluorination agent and fluorine removal experiments were conducted.Theactivated Al2O3addition,adsorption time,adsorption temperature,and pH on removal rate were investigated.For the underground water,in which fluorine content was 2.53 mg/L,the optimum static fluorine removal conditions,including addition of φ1~2mm activated Al2O3is 24g/L,adsorption time is 2hand adsorption temperature is 20℃,were determined.After fluorine removal process the fluorine content decrease to 0.90 mg/L and the defluorination rate is 64.43%.The optimum dynamic fluorine removal experimental results show that the average fluorine content of effluent is 0.70 mg/L under the conditions of the water flow velocity of 5 BV/h,adsorption temperature of 20℃and the adsorption fluid volume of 190BV.After fluorine removal process the fluorine content meets the impurity element content requirements of GB 5749—2006.