JP2000079323A - Exhaust ozone treating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent ozonized gas existing in an active carbon filter basin from leaking outside even if there exists a crack in a concrete constituting the active carbon filter basin and there exists a gap in an opening part provided on the top part of the active carbon filter basin by making always the inside of the active carbon filter basin to a negative pressure. SOLUTION: While inner pressure of an active carbon filter basin 6 is held under a active pressure by sucking exhaust gas from the inside of this active carbon filter basin 6 constituting an active carbon filter basin apparatus 2 by means of an exhaust gas suction device 3 the exhaust gas sucked from the inside of the active carbon filter basin 6 is guided into an exhaust ozone treating apparatus 4 to decompose and treat unreacted ozone in this exhaust gas and, while it is avoided to bring undesirable effects to the surrounding installation and people, ozone-treated water 7 is filtered by the active carbon filter basin apparatus 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust ozone treatment system which takes in exhaust gas from an activated carbon filter for filtering raw water containing residual ozone and decomposes unreacted ozone contained in the exhaust gas. About.

[0002]

2. Description of the Related Art Raw water to be filtered, for example, raw water after ozone treatment (hereinafter referred to as ozonized water) using activated carbon.
Most of the day is allocated to the filtration process in activated carbon filtration ponds that process lime. During this filtration step, a cleaning step is periodically allocated for a short period of time, for example, about 10 to 20 minutes per day, to clean the activated carbon.

In the filtration step, ozone not adsorbed by activated carbon remains in the treated water as dissolved ozone.
The dissolved ozone gradually evaporates, so that gas containing ozone accumulates in the upper part of the filter pond, and at the time of the washing step, the ozone retained in the activated carbon layer is released and accumulates in the upper part of the active carbon filter pond. As a result, the inside of the activated carbon filter is always filled with gas containing ozone.

[0004] In the activated carbon filtration pond, the water level of the pond changes during the filtration step and the washing step, and becomes positive pressure (positive side in absolute pressure) or negative pressure (negative side in absolute pressure). . Conventionally, when the inside becomes positive pressure, the gas containing ozone filled inside is taken out of the activated carbon filter from the breathing port provided at the top of the activated carbon filter,
After removing the mist (mist: mist-like component) contained in the ozonized gas pushed out from the breathing port by the mist separator, unreacted ozone is decomposed by the exhaust ozonolysis tower.

[0005]

By the way, in the above-mentioned activated carbon filter, when the water level of the activated carbon filter rises or the washing process starts, the inside of the activated carbon filter becomes positive pressure. At this time, if the coating provided on the inner surface of the activated carbon filter and the seal of the opening provided on the upper part of the activated carbon filter are perfect, and the activated carbon filter is completely closed as a structure, only from the breathing port can be used. Since the air cannot enter and exit, the gas inside does not leak to the outside from the wall or ceiling of the activated carbon filter, and the gas inside the activated carbon filter is guided to the waste ozone decomposition tower to decompose unreacted ozone. In addition, ozone-free gas can be released to the outside.

However, as time elapses, gaps are formed in the concrete constituting the activated carbon filtration pond, or when the packing of the manhole provided above the activated carbon filtration pond or the sealing material at the opening becomes weak,
Gas inside the activated carbon filter pond leaks from the cracked part of the concrete, the sleeve part of the pipe, the gap of the manhole, etc., to the outside due to the strong oxidizing power of the ozone contained in this gas. Corrodes the metal,
There are problems such as adverse effects on surrounding equipment and harm to people in the vicinity.

[0007] The present invention has been made in view of the above circumstances, and even if there is a crack in the concrete constituting the activated carbon filtration pond or a gap in the opening provided in the upper part of the activated carbon filtration pond, the activated carbon filtration pond. It is an object of the present invention to provide an exhaust ozone treatment system that can effectively prevent leakage of ozonized gas in the inside of the device to the outside.

[0008]

In order to achieve the above object, according to the present invention, unreacted ozone in exhaust gas discharged from an activated carbon filter pond into which ozonated water flows is decomposed. In the waste ozone treatment system, an exhaust fan that sucks exhaust gas inside the activated carbon filter, a pressure gauge that measures the pressure inside the activated carbon filter, and a measurement result of the pressure gauge are set to a set pressure upper limit value. When the pressure becomes lower, the operation of the exhaust fan is started.On the other hand, when the pressure reaches a set lower limit, the operation of the exhaust fan is stopped, and the internal pressure of the activated carbon filter is maintained at a negative pressure. And a control device for controlling.

According to a second aspect of the present invention, in the exhaust ozone treatment system according to the first aspect, the exhaust fan is provided on an outlet side of an exhaust ozone decomposition tower for decomposing the unreacted ozone. I have.

[0010] In claim 3, claim 1 or 2
In the exhaust ozone treatment system described in the above, a plurality of exhaust fans are installed, at least one of the exhaust fans is used for negative pressure control, and the other is used for cleaning the activated carbon filter in the cleaning process. Features.

According to a fourth aspect of the present invention, in the exhaust ozone treatment system according to the first or second aspect, the control device controls a rotation speed of the exhaust fan according to a measurement result of the pressure gauge. It is characterized by maintaining the internal pressure of the activated carbon filter at negative pressure.

In the above construction, when the internal pressure of the activated carbon filtration tank obtained by the pressure gauge reaches the upper pressure limit, the operation of the exhaust fan is started and the pressure lowers. In such a case, the operation of the exhaust fan is stopped to control so that the internal pressure of the activated carbon filter is always kept at a negative pressure. Unreacted ozone in the gas discharged from the activated carbon filter pond sucked by the exhaust fan is decomposed by an ozonolysis tower or the like. As a result, even if there is a crack in the concrete that constitutes the activated carbon filter, or if there is a gap in the opening provided at the top of the activated carbon filter, the ozonized gas inside the activated carbon filter will leak to the outside. Is prevented.

Further, since the exhaust fan is provided on the outlet side of the exhaust ozonolysis tower, when the exhaust fan is operated, the inside of the exhaust ozonolysis tower and the activated carbon filter pond are operated. Both become negative pressure. Ozone-decomposed exhaust gas is sucked from the exhaust ozonolysis tower 15. With this configuration, it is only necessary to install an exhaust fan on the outlet side of the waste ozonolysis tower, which is an existing facility, and the facility cost can be significantly reduced.

[0014] According to the third aspect of the present invention, the number of exhaust fans is plural, at least one of them is used for negative pressure, and the other is used for cleaning, so that the suction efficiency of the exhaust fan is improved. The pressure inside the activated carbon filtration pond can always be kept at a negative pressure while improving the pressure.

Further, according to the present invention, based on the measurement result of the pressure gauge, the control device controls the number of revolutions of the exhaust fan to maintain the internal pressure of the activated carbon filter at a negative pressure. The inside of the activated carbon filtration pond can always be under negative pressure while improving the suction efficiency of the fan.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 1 is a block diagram showing a first embodiment of the exhaust ozone treatment system according to the present invention, which corresponds to the first and second aspects of the present invention.

The exhaust ozone treatment system 1a shown in FIG.
Is an activated carbon filtration pond device 2 for filtering ozonized water 7
An exhaust gas suction device 3 for sucking exhaust gas from the inside of the activated carbon filter pond device 2, an exhaust ozone treatment device 4 for decomposing unreacted ozone in the exhaust gas sucked from the activated carbon filter pond device 2, A control device 5 for controlling the exhaust gas suction device 3 in accordance with the internal pressure of the activated carbon filter device 2; and an activated carbon filter device 6 constituting the activated carbon filter device 2.
The exhaust gas is sucked from the inside of the activated carbon filter 6 to decompose unreacted ozone in the exhaust gas sucked from the inside of the activated carbon filter 6 while maintaining the internal pressure of the activated carbon filter 6 at a negative pressure. The ozone-treated water 7 is filtered by the activated carbon filtration pond device 2 while not adversely affecting the surrounding people.

The activated carbon filtration pond device 2 filters an activated carbon filtration pond 6 made of concrete or the like, and ozonized water 7 placed in the activated carbon filtration pond 6 and introduced into the activated carbon filtration pond 6 from an inlet. An activated carbon layer 8 that is treated and discharged from the outlet to the outside, and a valve for air release provided in the upper part of the activated carbon filtration pond 6 and communicating between the inside and outside of the activated carbon filtration pond 6 when opened. 9, two valves 11 for guiding exhaust gas filled in the activated carbon filtration pond 6 when opened to the pipe 10 and supplying the exhaust gas to the ozone treatment device 4; And a pressure gauge 12 for measuring the internal pressure of the activated carbon filtration pond 6 through the pressure gauge 11.

The activated carbon filter pond 2 filters the ozone-treated water 7 supplied from the outside through the inlet, and discharges the filtered water to the outside from the outlet. In parallel with this processing, when the two valves 11 are open, the pressure gauge 12 measures the internal pressure of the activated carbon filtration pond 6 and controls the pressure detection signal obtained by this measurement operation. While supplying to the device 5, the exhaust gas inside the activated carbon filtration pond 6 is guided into the pipe 10 and supplied to the exhaust ozone treatment device 4.

When the exhaust ozone treatment device 4 is in an open state, the exhaust gas supplied through the pipe 10 is passed through the valve 13 and the mist in the exhaust gas supplied through the valve 13 is removed. A mist separator 14 for separating gas and discharging only mist to the outside, and an exhaust ozone decomposition tower 15 for decomposing unreacted ozone contained in exhaust gas from which mist has been removed by the mist separator 14
When the valve 13 is opened, the mist in the exhaust gas supplied through the pipe 10 is removed, and the unreacted ozone contained in the exhaust gas from which the mist has been removed is provided. Is disassembled.

The exhaust gas suction device 3 includes a control device 5
When the operation command is output from, while rotating at a preset rotation speed to make the inside of the waste ozone decomposition tower 15 a negative pressure and the inside of the activated carbon filtration pond 6 to a negative pressure,
A large-sized exhaust fan 16 that sucks the exhaust gas after ozone decomposition from the exhaust ozone decomposition tower 15 and discharges the exhaust gas into the atmosphere is connected to the exhaust fan 16 and the exhaust ozone decomposition tower 15 when opened. The exhaust gas guided to the exhaust fan 16 via the valve 17 and the exhaust fan 16
Check valve 18 and exhaust fan 16
An ozone concentration meter 19 is provided to measure the concentration of ozone in the exhaust gas sucked by the above and to monitor whether or not ozone remains in the exhaust gas.

When the operation command is output from the control device 5, the exhaust gas suction device 3 makes the inside of the exhaust ozone decomposition tower 15 a negative pressure and makes the inside of the activated carbon filter pond 6 a negative pressure. At the same time, exhaust gas that has been decomposed by ozone is sucked from the exhaust ozone decomposition tower 15 and released into the atmosphere while monitoring the ozone concentration in the exhaust gas.

The control device 5 determines whether or not the value of the pressure detection signal output from the pressure gauge 12 is within a preset range (upper limit H, lower limit L). And a control circuit for generating an operation command based on the determination result of the comparison circuit. The control circuit detects the internal pressure of the activated carbon filtration pond 6 based on a pressure detection signal output from the pressure gauge 12. , An on / off control of the exhaust fan 16 is performed, and the internal pressure of the activated carbon filtration pond 6 is always maintained at a negative pressure.

In this case, the upper limit H is "0" in absolute pressure.
, And the lower limit L is set further on the negative pressure side than the upper limit H based on the suction capacity of the exhaust fan 16 and the structural strength of the activated carbon filter pond 6.

Next, referring to the waveform diagram shown in FIG.
The operation of the exhaust ozone treatment system 1a will be described.

First, as shown in FIG. 2 (a), the operation state of the activated carbon filtration pond 6 is repeated in the order of a normal filtration step, a washing preparation step, a washing step, and a filtration preparation step to be filtered. The ozonized water 7 is filtered.

At this time, if the internal pressure of the activated carbon filtration pond 6 is set to almost “0” in absolute pressure, if the control of the control device 5 is stopped, the air release When the valve 9 is opened and the ozonated water 7 remaining in the activated carbon filtration pond 6 is drained, the internal pressure of the activated carbon filtration pond 6 becomes slightly negative due to the ozone treatment 7 that has been removed. In the washing step, the activated carbon layer 8 is washed in a state where the air release valve 9 is closed and the inside of the activated carbon filter pond 6 is sealed, and then the backwash water is filled, and a part of the water is drained. As a result, the internal pressure of the activated carbon filtration pond 6 becomes positive.

In particular, during empty washing and back washing, the internal pressure of the activated carbon filter pond 6 sharply increases, and the internal pressure of the activated carbon filter pond 6 is kept high even in a filtration preparation step performed after this washing step. Therefore, depending on the situation, the motor may be overloaded and peripheral devices may stop.

Therefore, in the waste ozone treatment system 1a according to the present invention, the pressure gauge 1 provided in the activated carbon filter pond device 2 is used.
2, the internal pressure of the activated carbon filtration pond 6 was measured, and FIG.
As shown in FIG. 2D, when the internal pressure of the activated carbon filtration pond 6 becomes higher than the upper limit H on the negative pressure side, the control device 5 outputs an operation command, and as shown in FIG. By operating the fan 16, the inside of the waste ozone decomposition tower 15 constituting the waste ozone treatment device 4 is made to have a negative pressure, and the exhaust gas inside the activated carbon filter pond 6 is sucked. The unreacted ozone is decomposed.

Thereafter, when the internal pressure of the activated carbon filtration pond 6 becomes lower than the lower limit L on the negative pressure side, the rotation command from the control device 5 is stopped, and as shown in FIG. By stopping the operation of the exhaust ozone decomposition tower 15
Is maintained at a negative pressure, the exhaust gas inside the activated carbon filtration pond 6 is sucked, and the unreacted ozone contained in the exhaust gas is decomposed.

Thereafter, this process is repeated to keep the internal pressure of the activated carbon filtration pond 6 within the range of the lower limit L and the upper limit H on the negative pressure side while maintaining the exhaust gas inside the activated carbon filtration pond 6. Is guided to the exhaust ozone decomposition tower 15 of the exhaust ozone treatment device 4 to remove mist contained in the exhaust gas, and then decompose the unreacted ozone.

As described above, in the first embodiment,
Exhaust gas is sucked from the inside of the activated carbon filter pond 6 constituting the activated carbon filter pond device 2, and while maintaining the internal pressure of the activated carbon filter pond 6 at a negative pressure, the exhaust gas sucked from the inside of the activated carbon filter pond 6 Since the unreacted ozone is decomposed and the ozone-treated water 7 is filtered by the activated carbon filter pond device 2 while not adversely affecting peripheral equipment and surrounding people, the activated carbon filter pond 6 is used. Even if there is a crack in the concrete that constitutes the above, or if there is a gap in the opening provided at the upper part of the activated carbon filter pond 6, the ozone gas inside can be prevented from leaking to the outside.

As a result, it is possible to prevent the facilities around the activated carbon filtration pond 6 from being adversely affected, and to prevent the surrounding people from being adversely affected.

Since the exhaust fan 16 is provided at the outlet side of the exhaust ozone decomposition tower 15, the exhaust fan 1
When the apparatus 6 is operated, both the inside of the waste ozone decomposition tower 15 and the inside of the activated carbon filtration pond 6 become negative pressure, and the exhaust gas after ozone decomposition is sucked from the waste ozone decomposition tower 15. With such a configuration, the system can be configured with simple construction simply by installing the exhaust fan 16 at the outlet side of the waste ozonolysis tower 15, which is existing equipment, and the equipment cost can be significantly reduced.

<Second Embodiment> FIG. 3 shows a second embodiment of the exhaust ozone treatment system according to the present invention, which corresponds to the third embodiment.
It is a block diagram showing an embodiment. In this figure, the same parts as those shown in FIG. 1 are denoted by the same reference numerals.

The exhaust ozone treatment system 1b shown in this figure is different from the exhaust ozone treatment system 1a shown in FIG. 1 in that the control device 5 is eliminated and the exhaust gas suction device 3 having only one exhaust system is used. An exhaust gas suction device 20 having two exhaust systems is provided, and the exhaust gas suction device 2 is provided only when the activated carbon filtration pond 6 is operated in the cleaning process.
When the activated carbon filtration pond 6 is operated in a process other than the cleaning process (a process such as a filtration process and a cleaning preparation process), a small suction force is generated to generate an exhaust gas suction device. That is, the inside of the activated carbon filtration pond 6 is always kept at a negative pressure while reducing the amount of electric power consumed at 20.

In this case, when the internal pressure of the activated carbon filtration basin 6 obtained by the pressure gauge 12 exceeds the upper limit H while the activated carbon filtration basin 6 is operated in the cleaning step, the exhaust gas suction device 20 operates as follows. By rotating at a preset rotation speed, the inside of the waste ozonolysis tower 15 is set to a large negative pressure,
The inside of the activated carbon filtration pond 6 is set to a negative pressure, and the ozone-decomposed exhaust gas is sucked from the exhaust ozonolysis tower 15,
A large exhaust fan 16 that releases to the atmosphere and stops rotating when the activated carbon filter pond 6 has been washed and backwashed, and an exhaust fan 16 and an exhaust ozone decomposition tower 15 when opened. And a check valve 18 for preventing the exhaust gas guided to the exhaust fan 16 via this valve 17 from returning to the exhaust ozone decomposition tower 15 side.

Further, the exhaust gas suction device 20 operates at a preset rotational speed when the exhaust fan 16 is not operating while the activated carbon filter pond 6 is operating in a process other than the cleaning preparation process. By rotating the exhaust ozone decomposition tower 15 to a slight negative pressure, the inside of the activated carbon filter pond 6 is set to a negative pressure, and the ozone-decomposed exhaust gas is sucked from the exhaust ozone decomposition tower 15 to the atmosphere. A small exhaust fan 21 for discharging, a valve 22 for communicating the exhaust fan 21 with the exhaust ozone decomposition tower 15 when the exhaust fan 21 is opened, and exhaust gas guided to the exhaust fan 21 through the valve 22 Check valve 23 for preventing return to waste ozone decomposition tower 15
And the minimum flow state is kept, and the adjustment valve 24 for protecting the equipment and the ozone concentration in the exhaust gas sucked by the exhaust fans 16 and 21 are measured, and no ozone remains in the exhaust gas. An ozone concentration meter 19 for monitoring whether or not it is provided.

Then, as shown in FIGS. 4A and 4B, the activated carbon filtration pond 6 constituting the activated carbon filtration pond device 2
Is operated in a normal filtration step → washing preparation step → washing step → filtration preparation step to filter the ozonized water 7 to be filtered, and the activated carbon filter pond 6 is operated in the filtration step. At this time, as shown in FIG. 4 (c), the small exhaust fan 21 is operated to make the inside of the waste ozone decomposition tower 15 of the waste ozone treatment device 4 slightly negative pressure, and A certain exhaust gas is sucked and guided to an exhaust ozone treatment device 4 for processing.

Thereafter, when the activated carbon filtration pond 6 is not operated in the filtration step and the cleaning preparation step is started, the operation of the exhaust fan 16 is stopped as shown in FIG. While maintaining the inside of the filter 15 at a negative pressure, the exhaust gas inside the activated carbon filter pond 6 is sucked and guided to the ozone treatment apparatus 4 for treatment.

Next, as shown in FIG. 4 (e), when the activated carbon filtration pond 6 is operated in the washing step and the internal pressure of the activated carbon filtration pond 6 exceeds the upper limit H on the negative pressure side, as shown in FIG. As shown in ()), the large exhaust fan 16 is operated to make the inside of the waste ozone decomposition tower 15 constituting the waste ozone treatment device 4 a large negative pressure, and the exhaust gas inside the activated carbon filter pond 6 is sucked. Then, the unreacted ozone contained in the exhaust gas is decomposed.

Thereafter, when the internal pressure of the activated carbon filtration pond 6 becomes lower than the lower limit L on the negative pressure side, or when the empty washing and the back washing in the washing step are completed, as shown in FIG. 4 and the small exhaust fan 21 is operated to make the inside of the waste ozone decomposition tower 15 a little negative pressure, as shown in FIG. Exhaust gas is sucked, and the exhaust gas is
To process.

Thereafter, the operation of the exhaust fan 21 is continued until the activated carbon filtration pond 6 is operated in the washing preparation step, and the inside of the exhaust ozone decomposition tower 15 is slightly negatively pressured to reduce the inside of the activated carbon filtration pond 6. Exhaust gas is sucked and guided to an exhaust ozone treatment device 4 for processing.

As described above, in the second embodiment,
The large exhaust fan 16 is operated only when the activated carbon filtration pond 6 is operated during a part of the washing process (during empty washing and back washing), and the other filtering process and washing process are partially performed (reverse washing). (Step after washing is completed)), when the apparatus is operated in the filtration preparation step, the small exhaust fan 21 is operated to make the inside of the exhaust ozone decomposition tower 15 constituting the exhaust ozone treatment apparatus 4 into a negative pressure, Since the exhaust gas inside the activated carbon filtration pond 6 is sucked and guided to the waste ozone treatment device 4 for treatment, the small exhaust fan 21 is used in the filtration process that occupies most of the day. Only with this, the internal pressure of the activated carbon filter pond 6 can be maintained at a negative pressure, whereby the power consumption of the exhaust gas suction device 20 can be reduced as compared with the first embodiment, and the exhaust fan 16 Start and stop times Gensa so, it is possible to reduce the load on the equipment.

As a result, in the second embodiment,
While the suction efficiency of the exhaust fans 16 and 21 is improved, the inside of the activated carbon filtration pond 6 is always kept at a negative pressure, and even if the concrete constituting the activated carbon filtration pond 6 has cracks,
Also, even if there is a gap in the opening provided at the upper part of the activated carbon filter 6, the ozonized gas inside can be prevented from leaking to the outside, and furthermore, the facilities around the activated carbon filter 6 are adversely affected. In addition to being able to do so, it does not adversely affect the people around them.

In the second embodiment, since the control of each exhaust fan 16 and 21 can be simplified, the control device 5 and the like can be omitted, and the system construction cost can be reduced. At the same time, the reliability of the system can be increased.

<< Third Embodiment >> FIG. 5 shows a third embodiment of the waste ozone treatment system according to the present invention.
It is a block diagram showing an embodiment. In this figure, the same parts as those shown in FIG. 1 are denoted by the same reference numerals.

The exhaust ozone treatment system 1c shown in this figure differs from the exhaust ozone treatment system 1a shown in FIG. 1 in that an exhaust fan 26 having no surging area is used as an exhaust fan of the exhaust gas suction device 25. Instead of the control device 5, a pressure controller 27 that calculates an optimal rotation speed based on a pressure detection signal output from the pressure gauge 12
And a rotation speed control device 28 for changing the rotation speed of the exhaust fan 26 in accordance with the rotation speed instruction obtained by the pressure controller 27. Based on the pressure detection signal output from the pressure gauge 12, the pressure The exhaust fan 26 is controlled by the controller 27.
The rotation speed of the exhaust fan 26 is changed by the rotation speed control device 28 based on the calculation result to constantly keep the inside of the exhaust ozone decomposition tower 15 constituting the exhaust ozone treatment device 4. That is, the exhaust gas inside the activated carbon filtration pond 6 is sucked at an optimum negative pressure, and the exhaust gas is guided to the waste ozone treatment device 4 for treatment.

Thus, as shown in FIGS. 6 (a) and 6 (b), the activated carbon filtration pond 6 constituting the activated carbon filtration pond device 2 is removed from the ordinary filtration step → washing preparation step → washing step → filtration preparation As shown in FIG. 6C, when the ozone-treated water 7 to be filtered is filtered by operating in the process, as shown in FIG. When the pressure H exceeds the value H, the rotation speed of the exhaust fan 26 is increased by the pressure controller 27 and the rotation speed control device 28, as shown in FIG. When the pressure falls below L, the pressure controller 27
As shown in FIG. 6 (d), the rotation speed of the exhaust fan 26 is reduced by the rotation speed
The ozonized water 7 is filtered by the activated carbon filter device 2 while always keeping the internal pressure in the range of the upper limit H and the lower limit L on the negative pressure side.

As described above, in the third embodiment,
Based on the pressure detection signal output from the pressure gauge 12, the pressure controller 27 calculates the optimum rotation speed of the exhaust fan 26, and based on the calculation result, the rotation speed control device 28 calculates the rotation speed of the exhaust fan 26. And the inside of the waste ozone decomposing tower 15 of the waste ozone treatment device 4 is always set to the optimum negative pressure, and the exhaust gas inside the activated carbon filter pond 6 is sucked. Since the inside of the activated carbon filtration pond 6 is always set to a negative pressure while improving the suction efficiency by the exhaust fan 26, even if the concrete constituting the activated carbon filtration pond 6 has cracks, In addition, even if there is a gap in the opening provided at the upper part of the activated carbon filter 6, the ozonized gas inside can be prevented from leaking to the outside. It is possible to prevent an adverse effect, it is possible to not adversely affect the people around.

In the third embodiment, the number of rotations of one exhaust fan 26 is changed so that
Because the internal pressure of is kept within a certain range,
As compared with the system in which the exhaust fan 16 is turned on and off as in the first embodiment, the load on the equipment can be reduced, and as in the second embodiment, the two systems of the exhaust fan 16, The equipment cost can be reduced as compared with the system in which the device 21 is provided.

[0052]

As described above, according to the present invention, according to the first aspect of the present invention, the inside of the activated carbon filtration pond can always be maintained at a negative pressure, so that the cracks in the concrete constituting the activated carbon filtration pond and the activated carbon filtration can be maintained. Even if there is a gap between the openings provided at the top of the pond, it is possible to prevent the ozonized gas inside the activated carbon filtration pond from leaking to the outside. As a result, it is possible to prevent adverse effects on people and facilities around the activated carbon filter pond.

According to the second aspect of the present invention, the system can be configured by a simple construction in which an exhaust fan is simply installed at the outlet side of the waste ozonolysis tower, which is an existing facility, and the facility cost can be greatly reduced.

According to a third aspect of the present invention, the number of exhaust fans for sucking gas from the inside of the activated carbon filtration pond is set to be plural, and these exhaust fans are used separately for negative pressure and for cleaning. The suction efficiency can be improved.

Further, in claim 4, the number of revolutions of an exhaust fan for sucking gas from the inside of the activated carbon filter pond is controlled,
By maintaining the internal pressure of the activated carbon filter at a negative pressure, the suction efficiency of the exhaust fan can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a waste ozone treatment system according to the present invention, which corresponds to claim 1;

FIG. 2 is a waveform chart showing an operation example of the exhaust ozone treatment system shown in FIG.

FIG. 3 is a block diagram showing a second embodiment of the waste ozone treatment system according to the present invention, which corresponds to claim 2;

FIG. 4 is a waveform chart showing an operation example of the exhaust ozone treatment system shown in FIG.

FIG. 5 is a block diagram showing a third embodiment corresponding to claim 3 in the waste ozone treatment system according to the present invention.

6 is a waveform chart showing an operation example of the exhaust ozone treatment system shown in FIG.

[Explanation of symbols]

 1a, 1b, 1c Exhaust ozone treatment system 2 Activated carbon filter pond device 3, 20, 25 Exhaust gas suction device 4 Exhaust ozone treatment device 5 Control device 6 Activated carbon filter pond 7 Ozonated water 8 Activated carbon layer 9, 11, 13, 17, Reference Signs List 22 valve 10 pipe 12 pressure gauge 14 mist separator 15 exhaust ozone decomposition tower 16, 26 exhaust fan 18, 23 check valve 19 ozone concentration meter 21 exhaust fan 24 adjustment valve 27 pressure controller (control device) 28 rotation speed control device ( Control device)

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 4D002 AA11 BA02 BA04 BA16 CA07 CA20 DA41 EA09 GA02 GA03 GB02 GB04 GB20 HA10 4D024 AA09 BA02 BB01 BC01 BC04 CA01 CA16 DA03 DA04 DA07 DB02 DB03 DB12 4D050 AA20 BB02 BC05 BD16 CA03 CA06 CA15

Claims (4)

[Claims] 1. An exhaust ozone treatment system for decomposing unreacted ozone in a gas discharged from an activated carbon filter pond into which ozonated water flows, comprising: an exhaust fan for sucking exhaust gas inside the activated carbon filter pond; A pressure gauge that measures the pressure inside the activated carbon filtration pond, and when the measurement result of the pressure gauge reaches a set pressure upper limit value, the exhaust fan starts operating while the set pressure lower limit value is set. And a control device for stopping the operation of the exhaust fan and controlling the internal pressure of the activated carbon filter at a negative pressure when the exhaust fan is stopped. 2. The exhaust ozone treatment system according to claim 1, wherein the exhaust fan is provided at an outlet side of an exhaust ozone decomposition tower that decomposes the unreacted ozone. . 3. The exhaust ozone treatment system according to claim 1, wherein a plurality of exhaust fans are provided, and at least one exhaust fan is provided.
A waste ozone treatment system characterized in that one stage is used for negative pressure control and the other stage is used for cleaning an activated carbon filter in a washing process. 4. The exhaust ozone treatment system according to claim 1, wherein the control device controls a rotation speed of the exhaust fan according to a measurement result of the pressure gauge, and controls an inside of the activated carbon filter pond. An exhaust ozone treatment system characterized by maintaining the pressure at a negative pressure.