Patent UA-102033-C2 (UA)
Title: Process for the treatment of water and regeneration of adsorbents by electrochemical adsorption-desorption method
Inventor: IVANETS VALERII HRYHOROVYCH
IPC: C02F1/46
Filed: 2012-03-05
Abstract: The invention relates to purification of water from soluble in it compounds in ionized form, and also to regeneration of adsorbent, particularly to the treatment of flows of active water treatment plants on atomic power stations from ammonia compounds and other solved in water admixtures, being in the form of cations and anions with the preparation of the treated distillation product, which can be used for process needs of reactor stations and other subdivisions of atomic power stations, and concentrated regenerate, given to further processing by evaporation method. The expected technical result of the process for the treatment of water and regeneration of adsorbents by electrochemical adsorption-desorption method is the increasing of cations and anions migration speed in micro-, meso- and macropores of volume electrode at their adsorption in the course of water treatment, and at their desorption in the course of regeneration of adsorbents, and also at prevention of gas extraction on electrodes in the course of carrying out of adsorption and desorption operations at water treatment and regeneration of adsorbents in pulsating modes. The mentioned technical result is achieved in that in the process of treatment of water and regeneration of adsorbents by electrochemical adsorption-desorption method, comprising the supply of purifying water to pore space of volume electrode, water treatment by electrochemical adsorption of ions to volume electrode, ageing of purifying water in pore space of volume electrode and outlet from pore space of volume electrode of treated water, formed after electrochemical adsorption. According to the claimed technical solution the supply of purifying water to pore space of volume electrode is carried out in pulsating mode, and the treatment of water by electrochemical adsorption of ions to volume electrode is carried out by imposition of the main constant and additional pulsating potential, besides electrochemical adsorption of ions to volume electrode is carried out at average total value of the main constant and additional pulsating potential, providing maximum adsorption capacity of double electric layer of volume electrode material against removed cations and anions, but less than decomposition potential of water on cathode or anode, and ageing of purifying water in pore space of volume electrode is carried out in the course of time, providing the given residual concentration of ions in treated water, and the outlet from pore space of volume electrode of treated water, formed at electrochemical adsorption, is carried out by replacement of the last with initial water to appearance in treated water jumping of ions, which is controlled by the measuring of electrical conductivity and/or concentration of hydrogen ions (pH). After the outlet from pore space of volume electrode of treated water regeneration of adsorbent is carried out by electrochemical desorption of ions from volume electrode with imposition of also the main constant and additional pulsating potential, and electrochemical desorption of ions from volume electrode is carried out at average total value of the main constant and additional pulsating potential, providing minimal adsorption capacity of double electric layer of volume electrode material against removed cations or anions, and is less than decomposition potential of water on cathode or anode, and the ageing of the obtained regenerate in pore space of volume electrode is carried out during the time, providing the given concentration of regenerate, and outlet from pore space of volume electrode of formed regenerate at electrochemical desorption is carried out by replacement of the last with initial or treated water before the beginning of dilution of ions in regenerate to given value, which is controlled by measuring of electrical conductivity and/or concentration of hydrogen ions (pH).