WATER RE-HARDENING PROCESS AND A SYSTEM THEREFOR

摘要

A process for producing re-hardened water, including: a) an infusion step in which at least CO2 is introduced into water to be re-hardened, to produce a first solution containing free CO2 of a concentration C1; b) a re-hardening step including passing the first solution through a re-hardening material to perform a dissolution process. The dissolution process has a contact time t during which the re-hardening material is dissolved in the first solution and a chemical reaction takes place between the dissolved re-hardening material and a part of the CO2. The CO2 constitutes an aggressive CO2, such that the process produces a second solution of water. The solution contains at least dissolution products, aggressive CO2 of reduced concentration of about C2a, and an equilibrium CO2 of increased concentration of about C2e; c) a separation step including separating from the second solution of a free excess CO2 constituted by aggressive CO2 of concentration C2a and equilibrium CO2 of concentration C2e. The separation step further includes removing free excess CO2 in a gas form, to produce the re-hardened water wherein step (b) is performed so that at least one of the following conditions is met: - C2a C2e and (C2a + C2e) 1; - C2 0.25C1; - t 15min;