JPS5898124A - Ozone treating apparatus - Google Patents

Abstract

PURPOSE:To provide the titled apparatus capable of purifying water or an exhaust gas containing a dirty component of which the concn. is variable by a small scale O3- generator, constituted so as to supply a necessary amount of an ozonized gas generated in the O3-generator and once stored therein to an ozone reaction system. CONSTITUTION:An ozonized gas generated in an O3-generator is pressurized by a compressor 11 and once stored in an O3-tank 9. The ozonized gas stored in the tank 9 is supplied to a duct 3 through a flow controller 13 and mixed with a gas to be treated supplied from a direction as shown by an arrow 13. In this case, the concn. of O3 in the gas to be treated, the concn. of a reducing component, for example NOx in a waste gas and the concn. of NH3 in a malodorous gas from sewage are measured by a densitometer 14 and the controller 13 is operated so as to mix a necessary amount of O3 corresponding to the concns. with the gas to be treated. In addition, when the pressure of the ozonized gas in the tank 9 is raised to a definite upper limit value, a pressure switch 10 is operated to stop the O3-generator 2 and a gas pump 11 as well as to close a solenoid valve 12. On the other hand, the pressure of the ozonized gas in the tank 19 is lowered to a definite lower limit value, the switch 10 is again operated to start the generator 2 and the pump 11 as well as to open the valve 12.

Description

[Detailed Description of the Invention] This invention relates to an ozone treatment device that purifies liquid or gas by using ozone, and more specifically, the ozonized gas generated in an ozone generator is temporarily stored in an ozone tank, and the ozone gas is removed from the ozone tank when necessary. The present invention relates to an ozone treatment device that supplies a large amount of ozone to an ozone reaction system.

Conventional ozone treatment apparatuses include those shown in FIGS. 1 and 2. Figure 1 is a flow diagram showing an example of a conventional ozone deodorizing device. In the diagram, (1) is a blower for sending the gas to be treated, (2) is a thin pipe for ozone, and (5) is for an ozone reaction section. The deodorizing tower (6) is a filler filled in this deodorizing tower. Note that arrow A indicates the flow direction of the ozonized gas, arrow B indicates the gas to be processed, and arrow C indicates the flow direction of the processing gas.

Next, the operation will be explained. The processing gas (arrow B) collected by the blower (1) is mixed with an amount of ozone a\ and a predetermined amount of ozonized gas (arrow A), and then sent to the deodorizing tower (5). The deodorizing tower (5) is filled with a filler (6) that promotes redox reactions such as activated carbon or heavy metal oxides, and the ozone oxidation reaction progresses while the mixed gas comes into contact with the filler (6). However, harmful reducing gases in the gas to be treated are oxidized and decomposed.

In the conventional ozone deodorizing equipment configured as described above, the concentration of reducing gas in the gas to be treated fluctuates depending on the season and time, so the ozone generator has a capacity at which the amount of reducing gas reaches its maximum. It had to belong to. However, in reality, the maximum and minimum values of the reducing gas concentration are different by an order of magnitude. Taking the concentration of valorized hydrogen in the gas emitted from a sewage treatment plant as an example, the maximum value is The ratio is 0.1 or more, the minimum value is 1ppm or less, and the ratio is 104:1 or more. Therefore, there is a drawback that the required capacity of the ozone generator becomes large.

Figure 2 is a flow diagram showing an example of a conventional ozone-based water treatment system. It is the trachea and is connected to the ozone pipe (4). ①) is the ozonized gas discharged from the ozone reaction tower (power), E is the water to be treated, and F is the arrow indicating the flow direction of the treated water.

In the water treatment equipment configured as described above, the water to be treated (arrow E) introduced from the upper part of the ozone reaction tower (power) is treated with ozonized gas supplied in the form of bubbles from the aeration pipe (8). (arrow) to oxidize reducing substances in the water to be treated with ozone.As a result, the water to be treated undergoes purification effects such as decolorization, reduction of chemical oxygen demand (COD), and deodorization. The water is discharged in the direction of arrow F. In this water treatment device as well, it was necessary to install an ozone generator (2) with a capacity commensurate with the maximum amount of ozone required for treatment of the water to be treated.

As mentioned above, in the conventional ozone treatment equipment a, the capacity of the ozone generator was determined according to the maximum amount of ozone required, so the capacity became large and the construction costs and running costs of the ozone generator were reduced. The drawback was that the cost was prohibitive.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above. After the ozonized gas generated by the ozone generator is stored in the ozone tank, the amount of ozone required in the ozone reaction section is automatically adjusted. By supplying ozone from an ozone tank, it is possible to temporarily supply an excessive amount of ozone and prevent the capacity of the ozone generator from becoming excessive. is intended to provide.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a flow diagram showing an example of the configuration of an ozone supply section of an ozone treatment apparatus according to an embodiment of the present invention applied to ozone treatment of gas such as deodorization of malodorous gas and denitrification of exhaust gas. The same reference numerals as those in the figures or FIG. 2 indicate the same or corresponding parts. (9) is an ozone tank installed in the middle of the ozone pipe (4), 10) is a pressure switch installed in this ozone tank, (Ill is an ozone gas supplied from the ozone generator (2) to the ozone tank (9) gas pump to send, 0
αa is the solenoid valve installed in the middle of the ozone pipe (4), αa is the flow regulator installed between the ozone tank (9) and the duct (3), and αa is the gas to be treated in the duct (3). A densitometer that measures the concentration of reducing components inside, 0 is electrical wiring.

Next, the operation will be explained. The ozonized gas (arrow A) generated by the ozone generator (2) is pressurized by the gas pump αυ and temporarily stored in the ozone tank (9). When the pressure of the ozonized gas in the ozone tank (9) rises to a certain upper limit, the pressure switch (io) operates to stop the ozone generator (2) and the gas pump Ql),
The solenoid valve (121) is closed. However, when the pressure of the ozonized gas in the ozone tank (9) decreases to a certain lower limit value, the pressure switch α0) operates again and the ozone generator (
2) and gas pump o1) are started, and 1JL! valve(
Open 1. The ozonized gas stored in the ozone tank (9) is introduced into the duct (3) through the flow regulator 0 and mixed with the gas to be treated (arrow B). The concentration of reducing components that react with ozone in the gas to be treated, such as nitrogen oxide in flue gas and ammonia in sewage odor, is measured with a concentration meter (14), and the required amount of ozone corresponding to the concentration is determined by the concentration. so that it is mixed into the gas to be treated by the output signal of the meter,
The flow rate regulator 031 operates.

In this example, the required amount of ozone in the gas to be treated is at most 1
5 ppm, minimum 0.2 ppm, daily average 3.5
ppm, when the levee breach gas amount is 10,000 Nm"/hour, the ozone generation capacity of the ozone generator (2) should be 75 g/hour. In short, the ozone concentration is 201/Nm@,
Change the gas pressure in the ozone tank (9) to 5 by gauge pressure 9/
i, then assuming that 1/3 of the daily average ozone requirement is stored in the ozone tank (9), the ozone tank (9)
) is 5n1''.In comparison, in the conventional apparatus shown in FIG. can be reduced to 1/4 or less.

The ozone tank (9) may be made of any material that is ozone resistant, does not cause ozone decomposition, and is opaque and blocks light, such as a stainless steel tank, glass, vinyl chloride resin, fluorine resin, etc. A metal tank is used whose parts that come into contact with ozone are coated with a resin that does not react with ozone, such as epoxy resin or polyethylene resin. The ozone piping (4), the gas pump 01), the solenoid valve (121, the flow rate regulator 0, etc.) are made of the same material for the parts that come into contact with the gas.

FIG. 4 is a flow diagram showing an ozone treatment apparatus according to another embodiment of the present invention applied to ozone treatment of wastewater containing pollutants such as raw water for drinking water, secondary treated human waste water, and domestic wastewater. The same reference numerals as in Figs. 1 to 3 indicate corresponding parts, but the ozone tank (9) is made of a plastic bag and is expandable and retractable, and the densitometer I is connected to the ozone reaction tower (which is discharged from the force). The remaining ozone concentration in the ozonized gas (arrow D) is detected, and the gas pump αυ with variable speed motor
is designed to be controlled.

In the ozone treatment apparatus configured as shown in Section 2, the ozonized gas (arrow A) is temporarily stored in the ozone tank (9) in the plastic bag section. The amount of ozonated gas stored in the ozone tank (9) is controlled by a pressure switch 00), similar to the embodiment shown in FIG. However, in this embodiment, the amount of ozonized gas in the ozone tank (9) is adjusted by expanding and contracting the ozone tank (9), and the gas pressure is maintained at a pressure of 01 to 02 atm higher than atmospheric pressure. The ozonized gas is transported to the tank (9) using the pressure of the ozonized gas discharged from the ozone generator (2).

O1 once stored in the ozone tank (9). The sintered gas is introduced into the ozone reaction tower (arrow E) by the gas pump α1). On the other hand, the water to be treated (arrow E) is introduced into the ozone reaction tower (arrow E) from the top of the tower, and the ozonized gas (arrow A)
After coming into gas-liquid contact with and removing pollutant components by ozone oxidation, it is discharged in the direction of arrow F. Concentration meter I is an ozone reaction tower (
The residual ozone concentration in the ozonized gas (arrow D) discharged from the engine is detected, and the gas is In this example, nj+ and nitrate ions (N
When oxidizing O2') to nitrate ion (N O'i),
The amount of water to be treated is 24 g/day, NO; the concentration is 2. O
17m”, minimum 0.1J/rr?, daily average 0.6,
9/n? In this case, the required ozone generation capacity of the ozone generator (2) may be 15 Kp/hour. Also, if the ozone concentration is 209/Nm" and the pressure in the ozone tank (9) is within 0.2 in terms of gauge pressure, the daily average ozone must be
Assuming that 1/3 of ft is stored in the ozone tank (9),
The maximum capacity of the ozone tank (9) can be set to 6 -.Compared to this, in the conventional device shown in Fig. 2, the required ozone capacity is 5 -.
0y/hour. Therefore, in this embodiment, the scale of the ozone generator (2) is approximately 1./3.3, which is significantly smaller.

In this embodiment, the material of the ozone tank (9) may be any opaque hard cloth-like material that is ozone resistant, does not cause ozone decomposition, and blocks light from the icS, such as fluororesin, soft vinyl chloride, etc. Any cloth bag made of resin, polyethylene resin, etc. may be used.

Note that the structure and material of the ozone tank, or the supply device for ozonized gas from the ozone tank are not limited to those of the above embodiments, and can be changed.

Further, in the above embodiments, the case where the present invention is applied to a deodorizing device and a water treatment device has been described, but the present invention is similarly applicable to other ozone treatment devices.

As described above, according to the present invention, after the ozonized gas is stored in the ocin tank, the necessary amount is supplied for ozonation treatment. It can be purified with a small ozone generator and has great practical value.

[Brief explanation of the drawing]

Figure 1 is a flow diagram showing an example of a conventional ozone deodorizing device.
FIG. 2 is a flow diagram showing an example of a conventional ozone water treatment device, FIG. 3 is a flow diagram showing an example of the configuration of an ozone supply section of an exhaust gas ozone treatment device according to an embodiment of the present invention, and FIG. FIG. 3 is a flow diagram showing a water ozone treatment apparatus according to another embodiment of the invention. In the diagram, the same reference numerals indicate the same parts or parts, (1) is the blower, (2) is the ozone generator, (3) is the duct, (,5) is the deodorizing tower, (power is the ozone generator, Reaction tower, (9
) is an ozone tank, (lO) is a pressure switch, and αa is a concentration meter. Agent Shin Kuzuno - (1 other person)

Claims (4)

[Claims] (1) Equipped with an ozone generator, an ozone tank for storing the ozonized gas generated by the ozone generator, an ozone reaction section, and a device for supplying the ozone required by the ozone reaction section from the ozone tank. An ozone treatment device featuring: (2) A detection device that automatically detects the required amount of ozone in the water or gas to be treated that is subjected to ozone treatment, and an adjustment device that automatically adjusts the ozone level supplied from the ozone tank based on the detected value. An ozone treatment apparatus according to claim 1, characterized by comprising: (3) The ozone tank is a stainless steel tank, or a metal tank coated with glass, vinyl chloride resin, fluororesin, epoxy resin, or polyethylene resin. Ozone treatment apparatus fl according to item 2. (4) The ozone treatment apparatus according to claim 1 or 2, wherein the ozone tank is a cloth-like container made of fluororesin, soft vinyl chloride resin, or polyethylene resin.