The method of water desalination

 

(57) Abstract:

The invention relates to electrochemical technology and can be used in power, chemical, metallurgical industry, mainly for drinking water. The method of water desalination involves passing it through a package of ion-exchange membranes and spacers, concluded between the two electrodes, obtaining diluate and brine in which by passing water between the electrodes, the latter optionally washed electrolyte with salinity 2-36 g/L. effect: reducing the power consumption and increase performance. 1 C.p. f-crystals.

The invention relates to electrochemical technology and can be used in power, chemical, metallurgical industry, mainly to meet vital human needs - get drinking water.

Known processing solutions of electrolytes with hydrogen diffusion anode and cathode (USSR author's certificate N 470301, B 01 D 13/02, 1975).

However, this processing does not allow the process at high current densities.

A known method of purification of water the spent titanium (Smagin Century. N. Water treatment by means of electrodialysis. - M.: stroiizdat, 1986, S. 110).

The disadvantage of this method is the high cost of the process and the inability to achieve high current densities.

The present invention is to increase productivity and reduce energy consumption.

This object is achieved by the fact that this method of desalination of water includes passing it through a package of ion-exchange membranes and spacers, concluded between the two electrodes, obtaining diluate and brine, and by passing water between the electrodes, the latter optionally washed electrolyte with salinity 2-36 g/l in the electrolyte can be used by the brine.

Known for high conductivity electrolytes, especially concentrated, and the possibility of their use as guides current.

The proposed solution can be used for desalination of different concentrations of solutions and enables repeated playback.

The process can be performed using artificially prepared synthetic electrolyte composed mainly of x is whether using as electrolyte brine, received as a direct result of demineralization. In this case, you can allocate a portion of the brine from the desalting process and constant washing them or anode, or cathode, or both the anode and cathode.

Valid once-through use of the brine, when the entire flow of brine continuously washes the anode and the cathode.

The method is as follows.

The source water for desalination is passed through a package of ion-exchange membranes and spacers, concluded between the two electrodes, obtaining diluate and brine. Near-electrode space is additionally continuously washed by the electrolyte with a salt content 2-36 g/l NaCl at a rate of 30 l/h of the Initial current density 343 a/m2. The current density during the whole period of desalination remains constant and as high as possible.

Example 1 (prototype). The solution to be desalted, containing 2.2 g/l NaCl, passed through a package of ion-exchange membranes and spacers, concluded between the two electrodes. The voltage at the device 120 C. the Initial current density on the electrodes 34,3 a/m2. Performance diluate 30 l/h of the Experience carried out within 1 h, passing through the apparatus 60 l of solution. The final salt content of 0.42 g/L.

Prnah membranes and spacers, concluded between the two electrodes. Near-cathode space additionally washed by artificially prepared electrolyte with a salt concentration of 36 g/l NaCl at a rate of 30 l/h of the Initial current density 34,3 a/m2. The final salt content of a solution of 0.38 g/HP Performance diluate 30 l/h

Example 3. Analogously to example 2, only the near-cathode and anode space additionally washed by artificially prepared electrolyte with a salt concentration of 36 g/l NaCl at a rate of 30 l/h of the Final salt content of 0.40 g/HP

Example 4. Analogously to example 2, only the anode and near-cathode chamber additionally washed by the electrolyte brine obtained directly in the process of desalination, with a salt content of 12 g/l, at a rate of 30 l/h of the Final salt content of 0.42 g/L.

The application of the proposed method, the additional use of the electrolyte allows to apply the current to the entire area of the ion exchange membranes.

Thus, implementation of the proposed method allows to reduce the consumption of electricity by combining processes of cooling of the electrodes with the removal of the products of hydrolysis of aqueous solutions, and also provides a uniform pic is uchumi passing it through a package of ion-exchange membranes and spacers, concluded between the two electrodes, obtaining diluate and brine, characterized in that by passing water between the electrodes, the latter optionally washed electrolyte with salinity from 2 to 36 g/L.

2. The method according to p. 1, characterized in that the electrolyte used is produced brine.

 

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