RU2802009C1 - Method for obtaining solutions of anolyte, catholyte, neutral anolyte - Google Patents

Abstract

FIELD: chemical engineering.

SUBSTANCE: invention is related to a method for producing solutions of anolyte, catholyte, neutral anolyte. The method is characterized in that the initial solution is treated with ultraviolet at 0.1 W per L/h, then the initial solution is treated with permanent magnets, at a magnetic field density of 120 gauss per L/h, then the initial solution is fed into the reactor on flat electrodes without a separating membrane, where in the cathode chamber of the reactor the solution is exposed to electric current in circulation mode using a circulation circuit while maintaining the pH value of the electrolyte in the circulation circuit, then the solution is fed into the reactors on coaxially located electrodes with a separating membrane, while in each reactor on coaxially located electrodes the anode has diameter is 20 mm, the cathode is made of titanium, the cathode diameter is 30 mm, the separating membrane has a diameter of 25 mm and is made of a mixture of aluminium oxide and zirconium, the length of the working part of the reactor on coaxially located electrodes is 250 mm, the synthesis of the final solution is carried out in reactors on coaxially located electrodes with separating membrane by method of sequential circulation.

EFFECT: producing disinfectant solutions from solutions with low initial mineralization with increased disinfectant properties.

3 cl, 14 dwg

Description

The method for obtaining a solution of anolyte - catholyte - neutral anolyte belongs to the field of applied electrochemistry and can be used in all areas of technology that require the use of disinfectant solutions, in particular in medicine, in the food industry and others, as well as in the field of obtaining drinking water with antioxidant and oxidant properties [B01J35/00, B01J37/00, C02F1/00, C02F9/00].

A METHOD AND DEVICE FOR WATER TREATMENT [AU2020367205 (A1) - 2022-03-31] is known from the prior art, which is a wastewater treatment process of municipal wastewater treatment plants. The process includes: (a) adding an inorganic oxidizing metal salt to the secondary or tertiary effluent to be treated and saturating the water with oxygen for a time effective to oxidize some of the pollutants; (b) raising the pH of the water in the oxidation step (a) to coagulate suspended and colloidal solids; (c) flocculating contaminants in water from step (b) using a cationic flocculant; (d) clarifying and separating the product precipitate from the water from step (c); and (e) subjecting the water from step (d) to catalytic oxidation and catalytic advanced oxidation in at least one reactor, with a bed to oxidize the residual inorganic contaminants and decompose the organic contaminants, wherein the decomposition of the organic contaminants is catalyzed by metal ions from the added inorganic oxidizing salt ( A). The disadvantage of this analog is the use of a large amount of highly active inorganic oxidizing salt, which is hazardous to the environment in high concentrations and increases corrosiveness.

Also known from the prior art is AGRICULTURE AND ANIMAL HUSBANDRY, A DEVICE FOR CLEANING GROUNDWATER AND SEA WATER TO ENVIRONMENTALLY FRIENDLY VALUES, [KR20180029424 (A) - 2018-03-21], which refers to an environmentally friendly water treatment device for purifying groundwater and sea water in agriculture and animal husbandry. The environmentally friendly water treatment device is able to purify sea water containing heavy metals and foreign substances, as well as polluted agricultural and livestock groundwater, to the state of purified water, from which pure salt can be obtained. In particular, the environmentally friendly water purification device of the present invention can purify polluted agricultural and animal groundwater and sea water into functional water with far infrared energy, so that the purified agricultural and animal groundwater and sea water is close to mineral water, which is filled with nutrients, allowing the magnetic ware, which is used as a purifying device to produce clean water by purifying contaminated water, to connect with the insides of a plurality of purifying filters in the main body body in a convenient and simple way, and to carry out a relatively simple process for purifying contaminated agricultural and livestock groundwater with using a purification and sterilization device or the like, such as a far-infrared ray machine and a UV sterilization filter installed in the peripheral water purification line to carry out the water purification process, thereby performing a clear filtration and sterilization process, and also magnetization process and far infrared radiation process. The disadvantage of this analog is the use of filters that require constant replacement due to a limited resource. At the same time, with an increase in the volume of processed water, the operating time of the filters decreases, and the physical characteristics of the resulting solutions deteriorate.

The closest in technical essence is a DEVICE FOR PRODUCING DISINFECTED WATER USING ELECTROCHEMICAL ACTIVATION OF AQUEOUS SOLUTIONS, [ES2426016 (A1) - 2013-10-18]. The invention relates to devices for producing disinfectant and disinfected waters by means of electrochemical activation of aqueous solutions. The device includes an electrochemical cell for processing an aqueous solution of sodium chloride, which enters through the inlet and is subjected to an electric current that separates it into a catholyte stream containing positive ions leaving the catholytic chamber of the cell through the catholyte outlet and a disinfecting anolyte stream, with negative ions, leaving from the anolyte chamber through the anolyte outlet. The catholytic and anolytic chambers are separated by a semi-permeable ion-permeable membrane. One of the cells includes an outer pipe for recirculation of the catholyte to the inlet of the anolytic chamber for recirculation of the catholyte fraction.

The main technical problem of analogs and prototype is the dependence of the disinfectant properties of the solution on its mineralization, so that the higher the mineralization of the solution, the higher its disinfectant properties. This problem will significantly reduce the scope of the claimed solution and require a highly mineralized solution as a feedstock to obtain a disinfected solution.

The objective of the invention is to eliminate the disadvantages of the prototype.

The technical result of the invention is to obtain disinfectant solutions from solutions with low initial mineralization with increased disinfectant properties.

The claimed technical result is achieved due to the fact that in the method of obtaining a neutral anolyte-catholyte-anolyte solution, the initial solution enters the reactor on flat electrodes without a separating membrane, where the solution is exposed to an electric current in the cathode chamber of the reactor, characterized in that the solution is exposed to an electric current in circulation mode using a circulation circuit while maintaining the pH value of the electrolyte in the circulation circuit, then the solution is processed in reactors on coaxially located electrodes with a separating membrane, where the final solution is synthesized by sequential circulation in the reactors.

In particular, when using an initial solution with a salt concentration of 0 to 0.3 grams per liter, an antioxidant and oxidant final solution is obtained.

In particular, when using a stock solution with a concentration of purified sodium chloride salt of 1 to 3 grams per liter, a disinfectant final solution is obtained.

Brief description of the drawings.

Figure 1 shows a diagram of obtaining a disinfectant solution.

The figure indicates: 1 - preparation of the components of the solution, 2 - ultraviolet treatment, 3 - treatment with permanent magnets, 4 - treatment in a reactor on flat electrodes without a separating membrane, 5 - treatment in a reactor on coaxially located electrodes with a separating membrane, 6 - disinfectant output solution, 7 - waste output.

Implementation of the invention

The method of obtaining a solution of anolyte-catholyte-anolyte neutral contains several successive stages, carried out according to the following scheme (see figure 1). At the first stage, the components of solution 1 are prepared. Obtaining water with antioxidant and oxidant properties is possible at a salt concentration of 0 to 0.3 grams per liter in the initial solution. To prepare solutions for disinfection, we use purified NaCl salt 1-3 grams per liter of the resulting solution. At the second stage, the resulting solution is treated with ultraviolet 2, with a power of 0.1 watts per liter/hour. A power of 0.1 watts per liter/hour has been experimentally found to be sufficient for efficient processing of the passing volume of the solution. At the third stage, the solution is fed to the processing of permanent magnets 3, at a magnetic field density of 120 gauss per liter/hour. The magnetic field density of 120 gauss per liter/hour has also been experimentally found to be sufficient for efficient processing of the passing volume of the solution. At the fourth stage, the resulting solution enters the reactor on flat electrodes without a separating membrane 4, where treatment is carried out in the cathode chamber of the reactor in circulation mode, using a circulation circuit while maintaining the pH value of the electrolyte in the circulation circuit. Further, at the fifth stage, the solution enters the processing in reactors on coaxially located electrodes with a separating membrane 5, where the synthesis of the final solution is carried out by sequential circulation from the reactor to the reactor.

In each reactor on coaxially arranged electrodes 5, the anode is made of titanium coated with ruthenium and iridium, the anode diameter is 20 mm, the cathode is made of titanium, the cathode diameter is 30 mm, the membrane is made of a mixture of aluminum oxide and zirconium with a certain pore size, the diameter of the separating membrane 25 mm. The length of the working part of the reactor is 250 mm. The pressure difference in the anode and cathode chambers of the reactor is set at a level that ensures the filling of the membrane pores with anolyte in the range from 70 to 100% of the diaphragm thickness, the pressure difference is provided either by maintaining a vacuum in the cathode chamber and the circulation circuit, or by maintaining an excess pressure.

In the course of the studies, it was found that when implementing the claimed method, after successive passage through three reactors on coaxially located electrodes with a separating membrane 5, the following are synthesized:

1. Anolyte with characteristics from PH1 to PH4 and redox potential from +850 to +1200 and chlorine PPM 150-1000,

2. Catholyte with characteristics from PH8 to PH12 and redox from -850 to -1200,

3. Neutral anolyte with characteristics from PH6.5 to PH8.5 and redox potential from +700 to +950 and chlorine PPM 150-500.

At the final sixth stage, the disinfectant solution 6 is withdrawn and the catholyte 7 is withdrawn from the reactor circuit on coaxially located electrodes with a separating membrane 5.

The invention is used as follows

At the first stage, a low-mineralized aqueous solution or drinking water with a salt concentration of 0 to 0.3 grams per liter is prepared at the stage of preparation of the components of the solution 1. To prepare solutions for disinfection, we use purified salt sodium chloride (NaCl) 1-3 grams per liter of the resulting solution . At the second stage, the resulting initial solution is sequentially passed through the UV treatment unit 2. At the third stage, the solution passes through the permanent magnet treatment unit 3. Preparation by means of permanent magnets and UV radiation. At the fourth stage, the solution enters the processing unit in the reactor on flat electrodes without a separating membrane 4. At the fifth stage, the solution enters for processing into reactors on coaxially located electrodes with a separating membrane 5. Circulating through the membranes between the anode and cathode chambers of the reactors on coaxially located electrodes with With a separating membrane 5, the solution acquires disinfecting properties without the use of additional mineralization, since the density of anions and cations increases in the solution. At the sixth stage, the disinfectant solution 6 is withdrawn and the catholyte 7 is withdrawn from the reactor circuit on coaxially located electrodes with a separating membrane 5.

When using this method of obtaining disinfectants, we have a solution that is 25-50% more active than existing analogues.

The technical result of the invention is to obtain disinfectant solutions from solutions with low initial mineralization, achieved due to the fact that initially the solution enters the reactor on flat electrodes without a separating membrane, where the preliminary separation of the charged particles in the solution occurs due to the action of electric current in the circulation mode, using a circulation circuit while maintaining the pH value of the electrolyte in the circulation circuit. Further, with the help of a membrane located in the geometric center of the reactor, there is a separation into anions and cations, which are formed in the corresponding chambers of the reactors, from these chambers they are transferred to a similar chamber of the next reactor, thus there is a gradual increase in the concentration of equally charged ions. Due to the fact that in the implementation of the claimed method, several sequentially located reactors on coaxially located electrodes are used in them, there is a gradual accumulation of equally charged ions and, accordingly, their concentration in the solution increases, due to which the disinfectant properties of the solution increase. At the same time, the presence of reactors on coaxially arranged electrodes makes it possible to circulate the solution inside the reactor and create an accumulation of equally charged ions in the corresponding chambers of the reactor.

Also, the implementation of the claimed method allows:

- use as initial - solutions with low initial mineralization;

- reduce power consumption for obtaining these solutions;

- expand the functionality of the technical solution by providing the ability to control the properties of the resulting solutions directly during electrochemical processing;

- reduce operating costs.

Examples of achieving a technical result

The method for obtaining solutions of anolyte, catholyte, neutral anolyte was implemented in the form of an installation. In FIG. 2 shows a general view of a plant for the production of a disinfectant solution.

The applicant implemented the claimed method in the form of an installation, which confirmed the technical result. When using the plant for the production of solutions for disinfection, we use the initial solution, which has a lower mineralization by 75-100%, while obtaining, at the same time, the final solution with similar characteristics in terms of its activity.

Claims (3)

1. A method for producing solutions of anolyte, catholyte, neutral anolyte, characterized in that the initial solution is treated with ultraviolet power of 0.1 W per l/h, then the initial solution is treated with permanent magnets, at a magnetic field density of 120 gauss per l/h, then the initial the solution is fed into the reactor on flat electrodes without a separating membrane, where in the cathode chamber of the reactor the solution is exposed to electric current in the circulation mode using a circulation circuit while maintaining the pH value of the electrolyte in the circulation circuit, then the solution is fed into the reactors on coaxially located electrodes with a separation membrane, at the same time, in each reactor on coaxially located electrodes, the anode has a diameter of 20 mm, the cathode is made of titanium, the cathode diameter is 30 mm, the separating membrane has a diameter of 25 mm and is made of a mixture of aluminum oxide and zirconium, while the length of the working part of the reactor on coaxially located electrodes is 250 mm, in reactors on coaxially arranged electrodes with a separating membrane in series circulation, the synthesis of the final solution is carried out. 2. The method according to p. 1, characterized in that when using the initial solution with a salt concentration of 0 to 0.3 g/l, an antioxidant final solution is obtained. 3. The method according to p. 1, characterized in that when using the initial solution with a concentration of purified sodium chloride salt from 1 to 3 g/l, a disinfecting final solution is obtained.