JP3464279B2 - Deodorizing or treating harmful organic substances - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating offensive odors or harmful organic substances scattered in the air, and particularly for removing ammonia odors in public toilets and sulfur oxides in food factories, or paints in coating factories. The present invention relates to a treatment method for purifying air at a place where a bad odor or harmful organic matter is generated, such as removal of a bad smell of an organic solvent by spraying or detoxification of recovery.

[0002]

2. Description of the Related Art Ammonia odors in public toilets, bad odors such as sulfur oxides in food factories, and irritating odors such as organic solvents in paint factories deteriorate the sanitary environment of public places and factories, and further There is a demand for effective removal of such bad odors and harmful organic solvents that fill the air due to environmental pollution.

The conventional odor in public toilets is that the tap water usually stored in a tank in the toilet is flushed periodically or each time it is used. In addition, for the treatment of harmful organic solvents having a bad odor such as sulfur oxides in a food factory and an irritating odor in a coating factory, a method is known in which mixed air at the generation site is taken into an exhaust duct and passed through a filter. In the treatment of scattered spray paint, a water curtain or a water filling tank is installed behind or below the object to be coated, and the residual spray paint is dropped onto the water curtain or the water surface and collected together with water. It is fresh.

[0004]

However, if the odor of ammonia is removed by about 80% or more, almost no one can feel it, but the rate of removal (dissolution) of ammonia by ordinary tap water is about 50%. Therefore, the conventional treatment method is insufficient for deodorizing ammonia, and cannot remove uric acid and the like adhering to the toilet bowl.
Further, the solubility of organic solvents such as acetone, styrene, and thinner in ordinary tap water is not sufficient, and there is a limit in reducing the concentration of these in the air.

In view of the above situation, the present inventor has made intensive studies and found that ammonia, sulfur oxides, etc., and organic solvents are removed from water whose redox potential (ORP) is lowered by electrical treatment. It was found that there is an odor effect, a dissolution of an organic solvent, and a detoxification effect, and the present invention has been completed.

Therefore, an object of the present invention is to deodorize a public toilet, a food factory or a paint factory, or remove an organic solvent or detoxify it at low cost and efficiently by a method using a simple device. It is intended to provide a method for purifying contaminated air.

[0007]

[Means for Solving the Problems] The above-mentioned problems are solved by water (hereinafter referred to as "water") having a redox potential reduced to 200 mV or less by applying a voltage.
It is solved by a treatment method of spraying (reduced water) on the indoor space where bad odors or harmful organic substances are generated.

Further, the malodor in public toilets and the uric acid adhering to the toilet, which is the source of the malodor, can be eliminated by a treatment method of flushing the toilet with reducing water. Further, it is solved by a treatment method in which contaminated air containing a bad odor such as sulfur oxides or a harmful organic solvent is taken into the exhaust duct and sprayed with reducing water.

The spray paint treatment for collecting the scattered spray paint by the water curtain is solved by forming the water curtain by reducing water. By spraying the object to be coated conveyed on the mesh conveyor on the water tank toward the water surface,
In the spray paint treatment for recovering the scattered spray paint, a treatment method of removing or detoxifying the harmful organic solvent in the spray paint by containing reduced water in the water tank is solved.

The reduced water used in such a treatment method has a ground electrode and a pair of application electrodes arranged in water in a tank, and is connected to a direct current power source and a direct current power source via variable resistors. 2 high frequency switches, a high frequency switching command circuit composed of flip-flop circuits connected to these high frequency switches via resistors, and a high frequency oscillator connected to the high frequency switching command circuit. A high frequency switching command is alternately given to the first and second high frequency switches according to a high frequency signal from the oscillator,
These first and second high-frequency switches are turned on and off at a high cycle to form a high-frequency alternating current, and are applied by alternately applying a high-frequency alternating voltage between the pair of applying electrodes.

[0011]

[Function] When reducing water is sprayed on ammonia filled in the room or uric acid adhering to the toilet of public toilets, sulfur oxides, or organic solvents, the odors of ammonia, spoilage, irritating odor, etc. disappear and The solvent is normal tap water (OR
(P is about 500 mV), it dissolves in the reduced water to a much greater extent. The same phenomenon including deodorant action is observed when the paint is sprayed into the duct and sprayed with reducing water, even when the paint is sprayed on the water curtain or the water surface of the tank. The reducing water is made in a water tank of the reducing device and is supplied by a water supply mechanism including a pump and a conduit.

[0012]

EXAMPLES Examples of the method for treating organic substances of the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 shows the layout of the processing devices used in the processing method of the present invention. An exhaust duct 1 is provided in the working chamber, and an exhaust fan 2 is provided outside the exhaust duct 1 at one end thereof. Are installed, and the intake ports 3 are provided at a plurality of positions of the exhaust duct 1 in the working chamber.

A fountain nozzle 4 is attached at an appropriate position in the exhaust duct 1 between the exhaust fan 2 and the intake port 3 so that the reducing water is sprayed over the entire cross section in the exhaust duct at the installation position. The fountain nozzle 4 receives the supply of reducing water created by a reducing device 5 described later. That is, the reduction device 5 receives the reduction water supplied from the water storage tank 8 of the reduction device 5 via the water supply mechanism including the supply pipe 6, the pump 7, and the like. At the lower part on the opposite side of the fountain nozzle 4, there is provided a drain portion 9 formed in a concave shape for collecting the injected water in a water storage tank.

The reducing device 5 comprises a water storage tank 8 and a control box 10, and a pair of application electrodes 8A and 8B and a ground electrode 8C are mounted in the water storage tank. Examples of such electrodes include lithium oxide, zinc, magnesium alloy, iron, stainless steel, copper, which are suitable for ORP reduction.
It is appropriately selected from titanium and the like.

Both application electrodes 8A and 8B are connected to a circuit inside the control box 10 outside the tank, as shown in FIG. That is, between the DC power supply 11 of 10 to 200 V and the application electrodes 8A and 8B, the DC current from the DC power supply is converted into high frequency AC through the variable resistor 12 and is alternately applied to the application electrodes 8A and 8B. The first and second high frequency switches 13A and 13B are connected. The first and second high-frequency switches 13A and 13B are composed of transistors 14A and 15A and 14B and 15B, respectively. The capacitor 1 is provided between the applied electrodes 8A and 8B.
It is connected via 6.

The first and second high frequency switches 13A, 13
B is connected to a high-frequency switching command circuit 18 including a flip-flop circuit which gives a high-frequency switching command to the switch via resistors 17A and 17B, and the high-frequency switching command circuit 18 is connected to the high-frequency switching command circuit 30.
A high frequency oscillator 19 for supplying a high frequency signal of ˜50 KHz is connected.

Although not shown, the water storage tank 8 is connected to a water supply source such as general tap water so that water can be replenished at any time. In order to produce reduced water by the reducing device 5 configured as described above, the storage tank 8 is filled with tap water or other treated water, and a timer (not shown) is set for a predetermined time or intermittently to switch the water. Just turn it on. When the switch is turned on, the DC power supply 1
As for the output from 1, when a high frequency signal is given from the high frequency oscillator 19 to the high frequency switching command circuit 18, a high frequency switching command is issued from the high frequency switching command circuit.
High frequency switches 13A and 13B are alternately applied, and the first and second high frequency switches are turned on and off at high cycles to form a high frequency alternating current, and a pair of application electrodes 8A and 8B mounted in the water storage tank 8 are formed. Are applied alternately. At this time, the AC voltage appearing between the application electrodes 8A and 8B is shown in FIG. 3, and the peak value of these AC voltages is determined by the variable resistor 12. Then, the application electrodes 8A and 8B
A DC current having a waveform shown in FIG. 4 is alternately observed between the ground electrode 8C and the ground electrode 8C. This waveform is applied to the application electrode 8A,
It is formed by adjusting the capacitance of the capacitor 16 provided between 8B, and such a rectangular wave is most effective in reducing the ORP of water.

The reduced water in the water storage tank 8 in which the ORP thus created has been lowered is supplied by the pump 7 via the supply pipe 6 to the fountain nozzle 4 in the exhaust duct 1 and sent into the duct. It is sprayed on the odor of ammonia, sulfur oxides, etc. and the organic solvent. The exhaust gas injected with the reducing water has its constituent components, such as ammonia, sulfur oxides, and an organic solvent, dissolved in the sprayed reducing water to be liquefied and stabilized. The liquefied dissolved liquid is collected in the drain part 9 and drained.
It is collected in the water storage tank 8 via b.

The reduced water (-
When the solubility of ammonia in 200 mV) was investigated, 9
It was 5%. In a public toilet at JR Ueno Station, we conducted an experiment to spray the whole with a nebulizer after confirming the stench of ammonia odor, and all of the 10 people who visited within 5 minutes after the spray had a bad odor. I got a report that I didn't feel it.

FIG. 5 shows another embodiment of the method of the present invention, in which an exhaust fan (not shown) is used in spray painting.
This creates an air flow in a certain direction in the work room, and also the water curtain C behind the spray-coated object T.
Is formed.

The water curtain C is formed by reducing water discharged from a groove-shaped water supply port formed on the lower side of the horizontally installed pipe 6a. The reducing water made in the water storage tank 8 is supplied to the pipe 6a through the pump 7 and the supply pipe 6 by the same reducing device 5 as in the above embodiment. The reduced water forming the water curtain C takes in the spray paint or the mixed solvent and is dropped and contained in a water receiving tank 20 installed below the spray paint. The aqueous solution in the water receiving tank is circulated to the water storage tank 8 of the reducing device 5 via the pump 7a and the drain pipe 9b.

The ORP value of the reducing device 5 is -250 mV.
The average value of the results of measuring the styrene concentration in the air during the spray coating work using reduced water reduced to 15 at 15 measuring points in the workplace was 5.9 ppm, Average value of about 9.9p when using the method used
The average reduction rate was about 40% as compared with pm.

Evaluation of working environment when a mixed solvent of acetone and styrene is used {calculation formula = acetone concentration /
Using the acetone control concentration (750) + styrene concentration / styrene control concentration (50)}, the conventional method was compared with the method of the present invention at the highest concentration, and the evaluation value by the conventional method was 0.398. On the other hand, the case according to the method of the present invention was 0.141, and the work environment was judged to be good because it was classified into the first management category.

FIG. 6 shows still another embodiment of the method of the present invention. In spray coating, the spray coating object T is sprayed downward while spraying downward onto the coating object placed on the mesh conveyor 21. A cleaning tank 22 containing reduced water is installed immediately below.

Here, the reducing device comprises the washing tank 22 and the control box 10, and the reducing water is directly produced in the washing tank. That is, this wash water tank 22 has the same structure as the above-described water storage tank 8 except that it has a large volume.
Since A, 8BA, and the ground electrode 8C are disposed therein and are connected to the control box 10, detailed description thereof will be omitted.

Also in this example, when the concentration of the mixed solvent of acetone and styrene in the air was measured in the same manner as in the above example, almost the same result was obtained. Since the first embodiment in which the fountain nozzle is provided in the exhaust duct described above can install most of the apparatus outside the coating chamber, the second embodiment forming the water curtain and the third embodiment using the cleaning tank It can be used together with the examples, and can be used in an appropriate combination depending on the purpose.

[0028]

EFFECTS OF THE INVENTION According to the invention of claim 1, 2 or 3, a foul odor, an irritating odor or harmful organic solvent generated in the air in public toilets, food factories or coating factories can be easily and efficiently removed. It is useful for improving the working environment, and eventually for preventing pollution.

According to the fourth aspect of the invention, the efficiency of removing the organic solvent harmful to the human body from the air in the coating method using the water curtain can be greatly improved. According to the invention of claim 5, it is possible to greatly improve the efficiency of removing the organic solvent harmful to the human body from the air in the coating method of spraying toward the cleaning tank.

According to the invention of claim 6, it is possible to carry out the above-mentioned inventive method by a simple method without danger of electric shock.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the positional relationship of devices used for carrying out the method of the present invention.

FIG. 2 is a circuit diagram of a reducing device used in the method of the present invention.

FIG. 3 is a waveform diagram of a high-frequency alternating current applied to the application electrode of the reduction device.

FIG. 4 is a waveform diagram of a DC current observed at the ground electrode of the reduction device of the above.

FIG. 5 is a vertical sectional view showing a positional relationship in another embodiment of the method of the present invention.

FIG. 6 is a vertical cross-sectional view showing a positional relationship in still another embodiment of the method of the present invention.

[Explanation of symbols]

1 exhaust duct 2 exhaust fan 3 air intake 4 fountain nozzles 5 Reduction device 6 supply pipes 7 pumps 8 water storage tank 8A, 8B application electrode 8C ground electrode 9 Drain section 10 control box 11 DC power supply 12 variable resistance 13A 1st high frequency switch 13B 2nd high frequency switch 14A, 14B, 15A, 15B transistors 16 capacitors 17A, 17B resistance 18 High frequency switching command circuit 19 high frequency oscillator 20 Water receiving tank 21 mesh conveyor 22 Wash tank C water curtain

Claims (6)

(57) [Claims] 1. A redox potential of 200 m is applied by applying a voltage.
A method for treating deodorant or harmful organic substances, which comprises spraying water reduced to V or less to an indoor space where bad odors or harmful organic substances are generated. 2. A redox potential of 200 m is applied by applying a voltage.
A deodorizing method characterized by rinsing the toilet bowl with water lowered to V or less. 3. A deodorant or harmful organic substance, characterized in that polluted air containing a bad odor or harmful organic substance is taken into an exhaust duct, and a voltage is applied to spray water with a redox potential lowered to 200 mV or less. Processing method. 4. A deodorant method for spray paint treatment for recovering scattered spray paint by a water curtain, characterized in that the water curtain is formed by water whose voltage has been applied to reduce the oxidation-reduction potential to 200 mV or less. Is a method of treating harmful organic substances. 5. A spray paint treatment method for recovering scattered spray paint by spraying an object to be coated conveyed by a mesh conveyor onto a water tank on a water tank for oxidation reduction. Potential of 200m
A method for treating deodorant or harmful organic substances, characterized in that water reduced to V or less is filled in the water tank. 6. A ground electrode and a pair of application electrodes are arranged in water in a tank, and a direct current power source and first and second high frequency switches respectively connected to the direct current power source via a variable resistor are provided. A high-frequency switch command circuit including a flip-flop circuit connected to the high-frequency switch via a resistor, and a high-frequency oscillator connected to the high-frequency switch command circuit. The high-frequency switch command circuit responds to a high-frequency signal from the high-frequency oscillator. A high-frequency switching command alternately to the first and second high-frequency switches, and the first and second high-frequency switches are turned on and off in a high cycle to form a high-frequency alternating current, and between the pair of application electrodes. 6. The method for treating deodorant or harmful organic substances according to claim 1, wherein the redox potential of water is lowered by alternately applying high-frequency alternating voltage.