SU814882A1 - Electrochemical method of oxygen removal from water - Google Patents

Description

Union of Soviet Socialist Republics

DESCRIPTION OF THE INVENTION

TO AUTHOR'S CERTIFICATE (61) Additional to author. certificate-woo - (11) 814882

USSR State Committee for Inventions and Discoveries

(22) Stated 02/26/79 (21) 2,730,302 / 23-26 (51) M. Cl. ³ with joining application number ~ C 02 F 1/46

(23) Priority -

Published 03.23.81- Bulletin N2 11 (53) UDC 663.63 Date of publication of the description 03.25.81 (088.8)

(72) The inventors

SOUTH. Ershov and S.V. Rudakov (71) Applicant ί s Ivanovo Power Engineering Institute named after B. AND ^ (54) ELECTROCHEMICAL METHOD FOR DECONFUSION OF WATER

The present invention relates to methods for deoxygenation of water and can be used in water treatment processes.

Known electrochemical method of deoxygenation of water by treating it in an electrolyzer with soluble anodes [1].

The disadvantage of this method is its complexity, since filters with a regeneration system are required to remove iron hydroxide from the treated water, as well as due to the fact that oxygen is formed on the cathode as a result of water electrolysis, which reduces the degree of deoxygenation.

The purpose of the invention is to simplify the process and increase the degree of deoxygenation.

This goal is achieved by the fact that in the electrochemical method of deoxygenation of water by treating it in an electrolyzer, water is supplied to the cathode chamber of the diaphragm electrolyzer and the treatment is carried out on insoluble electrodes at a current density of 1.47-3.68 a / dm ² .

The anode space is separated by the rest of the volume by a gas-tight partition, for example, a plate made of a porous material with pores that provide sufficient electrical conductivity of the medium, i.e. the passage of current from the cathode to the anode.

This reduces the possibility of oxygen leakage, which is formed at the anode, into deoxygenated water. When an electric current is applied within the specified limits, hydrogen is formed on the cathode, which is used to deoxygenate the liquid. Bubbles of hydrogen serve as an agent in which oxygen is desorbed. At a current density of 2.9 4 a / dm ^{1 2} , the greatest depth of deoxygenation of water with hydrogen is achieved. The resulting mixture of hydrogen, oxygen and nitrogen, provided that it is present in water, can again be used to desorb oxygen if oxygen or oxygen with hydrogen is removed from it. In the first case, hydrogen and nitrogen will be the desorbing agents, and in the second, nitrogen. In this case, it is possible to organize closed processes of deoxygenation of water. The use of hydrogen as a stripping agent in some cases eliminates the use of redoxites. This simplifies the process diagram and its implementation.

The determination of the boundaries of desorption deoxygenation with hydrogen depends on the value of the final oxygen concentration.

'' Example Through a diaphragm electrolyzer with a cathode and an anode of stainless steel, water is passed perpendicular to the current direction in an amount of 5 kg / h. The cathode is a disk with a diameter of 40 mm. The magnitude of the current density varies from 1.47 to 3.68 a / dm., _ In this case, the final oxygen content varies exponentially from 1.22 to 0.6 mg kg with an initial content of 8.0 mg / kg. The anode is isolated from the bulk of the liquid with a dielectric plate - a fluoro-15 layer / in which holes with a diameter of 0.8 mm are drilled through which electrical contact was made.

These openings and partitions prevent oxygen from entering the anode space into deoxygenated water.

The application of the proposed method provides, compared with existing, the following advantages: 25

1. A deeper deoxygenation.

2. Reducing the possibility of oxygen leakage.

Due to the process on insoluble electrodes and the use of a diaphragm electrolyzer, there is no need for final water filtration and the degree of deoxygenation of water increases, all other things being equal.

Claims (2)

3 81 The determination of the limits of the desorption dehydration with hydrogen depends on the value of the final oxygen concentration. - An example. Through a diaphragm electrolyzer with a cathode and an anode of stainless steel, water is passed perpendicular to the current direction in an amount of 5 kg / h. The cathode of forces serves as a disk with a diameter of 40 mm. The value of the current density varies from 1.47 to 3/68 a / dm. In this case, the final oxygen content varies exponentially from 1.22 to 0.6 mg kg with an initial content of 8.0 mg / kg. The anode is isolated from the main volume with a liquid dielectric plate - fluoroplastic / in which holes are drilled with a diameter of 0.8 mm through which electrical contact is made. These holes and partitions prevent the ingress of oxygen from the anode space into the deoxygenated water. The application of the proposed method provides in comparison with existing the following advantages: 1. Deeper deoxygenation. 24 2. Reducing the possibility of oxygen leakage. By carrying out the process on insoluble electrodes and using a diaphragm electrolyzer, the need for final filtration of water is eliminated and the degree of deoxygenation of water increases under other equal conditions. Claims of the Electrochemical Method for De-oxygenating Water by Treating It in an Electrolyzer, characterized in that, in order to simplify the process and increase the degree of deoxygenation, water is fed into the cathode chamber of the diaphragm electrolyzer and is processed at HepacTBOpHMbik electrodes at a current density of 1.47-3.68 -a / dm Sources of information taken into account in the examination - Klko V. A. and others. Purification of natural waters. M., 1971, p. 471 ((prototype).