| 摘要 |
<p>The present invention relates to a method for processing mineralised water containing sulfates and chlorides and in which the ratio between the chloride and sulfate concentrations does not exceed 1:6. This method comprises different steps such as water preparation, concentration, crystallisation and centrifugation. The crystallisation is carried out at a total salt content of between 50 and 100 g/l, while the concentration is carried out according to a reverse osmosis method under a working pressure of between 1.5 and 4.0 Mpa. During the concentration process, the ratio between the sulfate and chloride concentrations increases at least 2.5 times. Due to the feedback into the processing cycle of the residual solutions obtained from the crystallisation and the centrifugation, it is possible to further increase the ratio between the sulfate and chloride concentrations before the concentration step. When mixing the residual solutions with the starting water, the ratio between said concentrations can be increased by at least 18 %. When mixing the residual solutions with the starting water and with the water after each water preparation step, this same ratio can be increased by at least 3 % in the starting water and by at least 17 % in the water to be concentrated. The preparation step of the present method may for example include the elimination of heavy metals and of calcium- and magnesium-containing solids.</p> |
