Precipitating capacity of AQUA-AURAT™30 coagulant in water treatment in the presence of calcium hydroxide

Summary

The results of experimental studies of simultaneous elimination of sulphates, phosphates and fluorides from water with AQUA-AURAT™30 aluminium polyoxychloride in the presence of calcium hydroxide are presented. It was shown that the standard concentration of sulphates and phosphates is ensured with the chemical dosage ratio 4.5 (as active СаО/Аl₂О₃) and рН 11. Fluoride concentration under the circumstances is decreasing from 11 to 2 mg/l. The standard fluoride concentration in treated water is ensured at рН 7.

Key words

coagulant , water treatment , phosphates , aluminium polyoxychloride , calcium hydroxide , sulphates , fluorides