摘要
以实验研究的方法探讨氧化镁（ＭｇＯ）降低饮水氟含量的效能和影响因素，为进一步开发ＭｇＯ饮水降氟提供基础数据。实验证实ＭｇＯ具有明显的饮水降氟作用，其在一定时间内降氟率与加入量呈正相关。混凝法降氟时ＭｇＯ投加量为水氟含量的５００～１０００倍为宜。２４小时内可使水氟下降８０％以上，随时间延长降氟效率逐渐增加，最终可降氟９８％以上。加热煮沸可降低ＭｇＯ的用量并使降氟速度加快，水的ｐＨ增高可降低ＭｇＯ降氟率。水中ＣａＣＯ３含量在９００ｍｇ／Ｌ以下时对ＭｇＯ降氟效率无明显影响。降氟后饮水中氟含量在１ｍｇ／Ｌ以下，且有一定量镁离子残留，这对提高病区人群抗病能力和氟中毒的防治可能有良好作用。
The efficiency of drinkingwater defluoridation by magnesium oxide (MgO) and its related factors were studied.The results showed that MgO presented a good efficiency for drinkingwater defluoridation and there was a positive correlation between the dosage and rate of defluoridation in some ranges of contact time.The optimum ratio of F:MgO was 1:500 and 1:1000 during coagulating,and the defluoridation rate might reach at least 80 percent within 24 hrs.Defluoridation rate was gradually increased with the prolongation of contact time and reached 98% at last.Heating (100℃) might accelerate reaction and reduce MgO consumption.Defluoridation rate could be decreased by increasing pH value.There was no evident impact of content of CaCO3 at less than 900mg/L in drinking water on defluoridation rate.Presented study showed that MgO defluoridation might reduce fluoride from drinking water to ≤1mg/L,at the same time,increase the content of magnesium ion in drinking water to a certain extent,which might be benificial for preventing fluorosis and elevating the ability to resist fluoride toxicity,especially in population exposed to high environmental fluoride.So magnesium salts defluoridation was of great value to the development of practical use.
出处
《中国地方病学杂志》
CAS
CSCD
1998年第3期150-154,共5页
Chinese Jouranl of Endemiology
关键词
降氟
氧化镁
饮水
氟中毒
Defluoridation Magnesium oxide Drinking water
