混凝—微滤工艺处理含氟地下水的试验研究

Study on Coagulation/Microfiltration Process for Defluoridation of Underground Water

采用混凝—微滤工艺进行了地下水除氟的试验研究。静态试验表明了硫酸铝的混凝除氟效果比聚合硫酸铝的更佳。动态试验中发现,在改善饮用水水质及降低运行成本方面,采用CO2降低反应体系的pH比采用H2SO4更具有优越性。当原水F-浓度为2.74mg/L、硫酸铝投加量为154mg/L、混凝反应器内CO2的溶入量为183.2mg/L时,出水F-浓度为0.98mg/L、浊度<0.10NTU、UV254为0.012cm-1、Al3+<0.02mg/L、SO24-浓度为125.77mg/L、pH值为7.51,出水水质满足《生活饮用水卫生标准》(GB5749—2006)的要求。

Coagulation/microfihration process was applied to remove fluoride from underground water. Aluminum sulfate was chosen as coagulant in static experiment. It is found in dynamic experiment that CO2 is more effective than H2SO4 for reducing pH. When the concentration of fluoride in raw water, aluminum sulfate dosage and CO2 dissolved quantity in coagulation reactor are 2.74 mg/L, 154 mg/L and 183.2 mg/L, the concentration of fluoride in the treated water is reduced to 0.98 mg/L, the turbidity is less than 0.10 NTU, UV254 is 0. 012 cm^-1, the concentration of Al^3＋ is less than 0.02 mg/L, the concentration of SO4^2- is 125.77 mg/L and pH value is 7.51. The treated water quality can meet the requirement of Standards for Drinking Water Quality （GB 5749 -2006 ）.