METHOD OF THE DEEP DESALINATING OF THE SWEET AND THE BRACKISH WATERS Russian patent published in 2006 - IPC C02F9/08 B01D61/12 C02F1/42 C02F1/44 

FIELD: heat-and-power engineering; the methods of the deep desalinating of the sweet and brackish waters.

SUBSTANCE: the invention is pertaining to the field of the heat-and-power engineering, in particular, to the method of the deep desalinating of the sweet and brackish waters and may be used for production of the deep desalinated water from the sweet and desalinated waters. The method of deep desalination of the sweet and brackish waters includes the sequential processes including the following stages: clarification, treatment of the clarified water with the ion-exchange filters and desalting at the reverse osmosis stage with the concentrate withdrawal from each stage of purification. At that the process of the reverse osmosis desalination is conducted at least, within two stages at the higher pressure of the purified water at each subsequent stage of desalting using the corresponding to the preset pressures diaphragms and the ratio of consumptions of permeate to the concentrate at the reverse osmosis stage in the whole within the limits of n = 7-99, and withdrawal of the concentrate is conducted from the reverse osmosis stage at each stage at regeneration of the ion-exchange filters. At the heightened contents of the organic compounds the clarified water is additionally subjected to Cl-ionization at the filters loaded with the organo-absorbing anionite, withdrawal of the concentrate from the reverse osmosis installation is conducted at the regeneration of the Cl-ionite filter and then - at the regeneration of the H-Na-cationite filter, but the withdrawal of the alkaline solution - at additional regeneration of the Cl-ionite filter. The method ensures the significant output of the permeate, the reduced consumption of the concentrate. At that the quality of the desalted water is improved and the escape of the concentrate at the stages of desalting is reduced and the consumption of the water by the installation is also reduced.

EFFECT: the invention ensures the significant output of the permeate, reduced consumption of the concentrate, improved quality of the desalted water, reduced escape of the concentrate at the stages of desalting, reduced consumption of the water by the installation.

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