单 位：
西北农林科技大学理学院;西北农林科技大学资源环境学院
摘 要：
为了降低农村含氟饮用水中氟离子的浓度,采用钙盐沉淀法,研究氯化钙投加量,pH和静置时间3个因素对除氟效果的影响,确定最优的除氟条件;试验在不同氯化钙投加量比(分别为1:1、1.5:1、2:1、2.5:1)下,分析静置时间和反应pH值对除氟效果的影响;通过试验,确定出三因素的最佳组合为氯化钙的投加量比为2.5:1,pH8.5,静置时间最少50min。在该条件下,可将水中的氟离子浓度由20mg/L降低到7mg/L左右;应用此方法可以有效减轻地方性氟中毒。
译 名：
The Treatment of Calcium Precipitation on Fluoride Drinking Water in Rural Areas
作 者：
Xue Li1,Hu Shibin2 (1College of Resources and Environment,Northwest A&F University,Yangling Shaanxi 712100; 2College of Science,Northwest A&F University,Yangling Shaanxi 712100)
关键词：
fluoride-containing water; calcium chloride; chemical precipitation
摘 要：
By means of calcium precipitation,the effects of calcium chloride dosage,pH and standing time on fluoride remove were studied in order to optimize the parameters to reduce the fluoride in water in rural areas. Under different dosage of calcium chloride (at 1:1,1.5:1,2:1,2.5:1,respectively),the effects of pH and standing time on fluoride were analyzed. The results showed that,three factors of the best combination were calcium chloride dosage of 2.5:1,pH 8.5,standing time at least 50 min,and under this condition,the concentration of fluoride was reduced from 20 mg/L to 7 mg/L; therefore,the application of this method can effectively reduce endemic fluorosis in rural areas.
