赣榆饮用水除氟试验

DEFLUORINATION EXPERIMENT ON THE DRINKING WATER IN GANYU COUNTY,JIANGSU PROVINCE

本文采用铝盐除氟法处理赣榆县高氟饮用水,技术简易,除氟效果好。

The aluminhe(?)ous salts such as alumstone can be used to remove fluor ion from the drin- King water,by adding 0.1 per cent of alumstone because of large affinity between aluminium and fluor ions and the absorbability of aluminium ion for fluor ion.The laboratorial experiment indicates that the defluorination efficiency reaches the best level when the condition pH-value is 6,which corresponds to the calculated results theoretically.Then,the practical defluorination has been carried out by adding right amount of alumstone,0.1-0.5 per cent with a perfect effectness in Ganyu county,north of Jiangsu.The content of fluor ion in defluorinated water is below the standard of drinking water(1 per cent)with unchanged aluminium ion content. To remove the impurity for instance potassium and sulphate radicle ions and decrease the cost of defluorination process,alumstone,usually acted as defluorination agent,should be subs- tituted with aluminium sulphate.If half aluminium sulphate is added into the water,the defluo- rination efficiency is perfect.It is very favourable for the defluorination method to be applied and spread in the countryside and water mills.