某些除氟方法除氟效能分析

本实验室就一些除氟技术作了除氟效果比较试验。混凝沉淀组１１种实验的除氟剂中４种（１种铝制剂，３种提取骨盐制剂）在４￣８０小时内可将含氟１０．５ｍｇ／Ｌ水的氟浓度降到１．０ｍｇ／Ｌ，５种铝制剂先降到了可接受的１．０ｍｇ／Ｌ，然后又上升；提取的骨盐剂随着时间的延长除氟效能增高，在吸附滤过程，以提取骨盐为最好．活性氧化铝可从水中清除较高氟，但必须先用铝盐处理，活性氧化铝作氟效能受处理水的流程方式影响，同

Analysis of Defluoridation Effect in some Defluoridative Methods

A series of defluoridative tests vere made to compare the defluoridation effect in some defluoridation methods in our laboratory. In group of coagulent precipitation, it was found that four reagents (one aluminium compound, three purified bone salts) among eleven defluoridation reagents tested could reduce the concentration of fluoride in water from 10. 5 mg/L to less than 1. 0 mg/L In period of 4-80 hours, that five aluminium reagents showed appearance of reducing the fluoride to acceptable limt (<1. 0 mg/L) first but then increasing again, and the effect of defluoridation carried on increasing with the prolonged time in the reagent of purified bonesalt. In group of adsorbent filtration, the capacity of defluoridation in purified bonesalt was higher than that of the other filtration materials (bone char, activated alumia). The activated alumia could remove more fluoride from drinking water, but it had to be treated by aluminium compound before treating water. The efficacy of defluoridation of activated alumia was affected by the way of flow course in treatment water also. The amount of fluoride removed by double-way (down first and then up way) was obviously higher than that by down-way in same weight of filtration material.