METHOD OF FLUORINATING WATER AND APPARATUS FOR REALISING SAID METHOD Russian patent published in 2012 - IPC C02F1/68 C02F1/76 C02F103/04 

FIELD: chemistry.

SUBSTANCE: method involves preparation of an aqueous suspension with 0.22% content of Mg(OH)F for not more than 30 minutes, which is then fed into a diluter for not less than 20 minutes. From the diluter, Mg(OH)F solution having fluorine concentration of not more than 67 g/m³ is ejected into the common stream of treated water. Flow rate of the Mg(OH)F solution is determined based on controlling content of fluorine in the solution and in the common stream of the treated water using the formula: Q_p=(Q_c.s. x C_f)D_f, where: Q_s is the flow rate of the ejected solution, m³/h; Q_c.s. if the flow rate of the common stream of the treated water; C_f is concentration of fluorine in the solution, g/m³; D_f is the calculated dose of fluorine fed into the common stream, g/m³, which is determined using the formula: D_f=C_{f o.p.} - C_{f s.w.}, where: C_{f o.p.} is the standard concentration of fluorine in drinking water, g/m³; C_{f s.w.} is the concentration of fluorine in starting water, g/m³. The apparatus for fluorinating water has chemical feeders, a reactor, a diluter tank, an ejector at the starting water feed pipe, the suction pipe of which is connected to the pipe for feeding the solution from the diluter tank, fluorine sensors at the starting water feed pipe and after addition of the fluorine-containing solution, flowmetres and an automatic control unit, whose inputs are connected to level sensors, fluorine sensors and flowmetres, and whose outputs are connected to electric motors of mixers, chemical feeders and shut-off valves.

EFFECT: efficient and accurate batching of fluorine-containing reactant, reduced operational costs.

2 cl, 1 dwg, 2 tbl, 2 ex