FIELD: chemistry.
SUBSTANCE: method includes treating water with a calcium-containing composite sorbent while stirring to obtain solid treatment products and purified water. The sorbent consists of calcium sulphate particles immobilised on fibrillated cellulose fibres containing not less than 95 wt % of fibres with length of not more than 1.2 mm and not less than 55 wt % of fibres with length of not more than 0.56 mm, in amount of 100-1200 pts.wt of calcium sulphate per 100 pts.wt fibres. The solid treatment products obtained are a composite material consisting of fibres and calcium fluoride and/or phosphate particles immobilised thereon.
EFFECT: invention simplifies the method of treating water with extraction of fluorine or phosphates in a wide range of concentration thereof.
2 cl, 4 ex
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