JPH10113665A - Electrode for electrolytically oxidizing water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode to be used when the water contg. org. matter, bacteria, etc., is purified by electrolytic oxidation. SOLUTION: A nonwoven-fabric filter 3 is held between an anode 1 and a cathode 2 in contact with the water inlet-side face of the anode 1 to constitute the electrode. The anode 1 and cathode 2 consist of a water-permeable metallic sheet, especially a metallic sheet excellent in oxidation resistance, since active oxygen is generated on the anode surface. Ti is preferably used as the anode material, and the oxidation resistance is further improved by a platinum plating. The nonwoven fabric 3 held between the anode 1 and cathode 2 can be made of the resin, metal, ceramic and conductive or nonconductive material. The nonwoven fabric 3 acts as one kind of filter medium, and the suspended org. matter separated by filtration and blocked by the front of the nonwoven fabric is oxidized by the oxygen generated on the anode and burned. The water current is introduced from the cathode 2, filtered by the nonwoven fabric 3, passed through the anode 1 and discharged to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electro-oxidation electrode for water, and more particularly to bath water containing organic matter and various germs, water for fish cages, water for live fish tanks, and water supply circulation for buildings and condominiums. The present invention relates to the structure of an oxidation electrode when purifying water used in circulation, storage, and the like, such as water, pool water, and lake water, by electrolytic oxidation.

[0002]

2. Description of the Related Art The present inventors have invented and have already filed an application for electrolytically oxidizing and purifying circulating water using a water-permeable carbon electrode. According to this method, it was found that excrement of fish in the live fish tank, organic matter in bath water, and other organic matter in water containing organic matter can be oxidized and decomposed. However, there was one problem. If the current density during electrolytic oxidation is increased, the decomposition rate of organic matter will certainly increase, but with the increase in current, the surface of the carbon electrode also undergoes electrolytic oxidation, and colloidal carbon fines precipitate from the surface. The water turns black. Although the deposition of carbon itself is not harmful, there is a problem particularly in applications where circulation and storage tanks are used because water turns black. In order to eliminate the deposition of carbon fines, an oxidation-resistant metal other than carbon must be used as an electrode material, but it is too expensive to form a filter material that is comparable to carbon material with metal, which is too expensive Met.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to provide a new method which solves the above-mentioned problems.

[0004]

The above problems are solved by the following means. 1. A water electro-oxidation electrode comprising a non-woven fabric filter sandwiched between a metal anode and a cathode formed of a water-permeable oxidation-resistant metal plate and in contact with the water inflow side of the anode. 2. 2. The electrode according to 1, wherein the anode material is titanium. 3. 3. The electrode according to 2, wherein the surface of the anode is plated with platinum.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The main part of the electrode used in the present invention is 3
It has a layer structure. That is, the nonwoven fabric filter is sandwiched between the anode and the cathode, in contact with the surface of the anode on the water inflow side.

Both the anode and the cathode are made of a water-permeable metal plate, and in particular, are made of a metal plate having excellent oxidation resistance because active oxygen is generated on the surface of the anode. The anode material is preferably Ti, and when plated with platinum, the oxidation resistance is further improved.

The nonwoven fabric sandwiched between the anode and the cathode may be made of resin, metal, ceramic, conductive or non-conductive material. The nonwoven fabric acts as a kind of filter material, is separated by filtration, and the suspended organic matter in the water blocked on the front surface of the nonwoven fabric is oxidized by oxygen generated at the anode and burns. The stream of water enters at the cathode, is filtered through a nonwoven, and exits through the anode.

The oxidation current is approximately 50 for an area of 200 cm ^2.
One standard is about 0 to 2000 mA, but if the coarseness and the total current value are adjusted according to the size of the organic matter, the organic matter in the circulating water can be efficiently oxidized and eliminated.

[0009] The method of the present invention is a method of purifying circulating bath water, ie, circulating bath water which can be used for 24 hours, purifying food wastewater, purifying aquaculture tanks, purifying pools and lakes, deodorizing water, decolorizing water, and the like.
It is effective in breaking down pesticides in water and preventing weeds, moss and algae in paddy fields.

The structure of the present invention will be described with reference to the drawings. 1 to 4 are explanatory views of the structure of the present invention. 1 and FIG.
Is a perspective view, and FIG. 2 is an explanatory view of a cross-sectional structure. 1 is a water-permeable Ti anode, 2 is a water-permeable stainless steel (SUS304)
It is a cathode. 3 is a nonwoven fabric filter inserted between 1 and 2. One Ti anode is plated with platinum as needed. Water enters from the cathode 2 side, passes through the nonwoven fabric 3 and enters the anode 1, passes through the inner surface of the anode and exits through the outlet. The nonwoven filter is pressed against one anode by the pressure of water. Active oxygen is generated on the anode surface of No. 1, and the organic substance blocked by the nonwoven fabric is decomposed by oxidation by the generated oxygen. In other words, a kind of combustion occurs and gas is diffused into carbon dioxide and nitrogen or nitrogen oxides. Although the basic structure of the present invention is represented by the structures shown in FIGS. 1 and 2, if necessary, a water-permeable Ti anode may be further arranged on the outer periphery of the cathode. 3 and 4 are explanatory diagrams in this case.

[0011]

【Example】

 Example 1 Water oxidation treatment was performed using the electrodes having the structures shown in FIGS. Dimensions of Ti anode: diameter 90 mm, length 110 mm Hole diameter of water passage hole: 0.5 mm, area ratio of water passage hole: 60% Stainless steel cathode: diameter 110 mm, length 110 mm Hole diameter of hole: 0.5 mm, water passage Area ratio of holes: 60% Distance between anode and cathode tubes: 3.5 mm Non-woven fabric: Non-woven fabric of resin fiber Fiber diameter 100 μm

<Application to Bath Water> Bath water was circulated from the cathode side of stainless steel. Current: 1000 mA Tested for 20 days. The total number of bathers is 100. Results There was no sludge-like deposit on the nonwoven fabric and the titanium electrode. It was confirmed that the organic matter was completely decomposed. Escherichia coli in bath water was not detected. There was no scale on the bathtub.

Example 2 (Treatment of pesticide water) The same electrolytic apparatus as in Example 1 was used. A mixture of 15 liters of (dimethyl dicarbethoxyethyl dithiophosphate) in 30 liters of water was circulated all day and night. <Results> Pesticides were not detected. The water, which was cloudy white with pesticides, became clear.

Example 3 (Deodorization of ammonia) The same electrolytic apparatus as in Example 1 was used. Water with ammonia smell was electrolyzed all day and night. The smell of ammonia was completely gone.

Example 4 (Removal of water slime) The same electrolytic apparatus as in Example 1 was used. The slime of the slime was tested on the bath water. The same electrolytic device as in Example 1 was used. Treated for 6 hours. The slime was removed and it became smooth.

Example 5 (Circulating water of cooling tower) The same electrolytic apparatus as in Example 1 was used. Test period 12 months No scale was deposited on the inside of the pipe. There was no red rust on the pipe.

Example 6 (Treatment of water mixed with an organic solvent) The same electrolytic apparatus as in Example 1 was used. The water in which 1 ppm of trichlorethylene was detected was treated. Time: Day / Night Results Trichlorethylene was not detected.

[0018]

As described in detail above, the present invention is capable of oxidizing organic substances at a high current and at a high speed, and greatly contributes to effective use of water resources. <Application example> 1. Purification of bath water 2. 2. Circulating water of heat exchanger Circulating cooling water 4. Solar system 5. 5. Various water supply and drainage facilities such as water supply and water supply for buildings. 6. Various cooling water scales, measures against red rust Swimming pool 8. Sewage treatment, industrial wastewater treatment 9. Golf course wastewater treatment 10. Water treatment of aquariums and water tanks Pond water purification

[0019]

[Brief description of the drawings]

FIG. 1 is a diagram (perspective view) illustrating the structure of the present invention.

FIG. 2 is a diagram (cross-sectional view) illustrating the structure of the present invention.

FIG. 3 is a view (perspective view) illustrating another structure of the present invention.

FIG. 4 is a diagram (cross-sectional view) illustrating another structure of the present invention.

[Explanation of symbols]

 1 Ti anode 2 Stainless steel (SUS304) cathode 3 Non-woven fabric filter

Claims (3)

[Claims] 1. A method of electrolysis of water, comprising a nonwoven fabric filter interposed between a metal anode and a cathode made of a water-permeable oxidation-resistant metal plate, in contact with the surface of the anode on the water inflow side. Oxidation electrode. 2. The electrode according to claim 1, wherein said anode material is titanium. 3. The electrode according to claim 2, wherein said anode surface is plated with platinum.