JP2000061479A - Water treatment facilities - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently purify water to be treated and to effectively utilize oxygen formed by the reduction of ozone. SOLUTION: The treatment using the facilities comprises: mixing ozone 7 with water 17 to be treated and purified, by a gas-liquid supply means 24, to obtain ozone-containing water and to supply the ozone-containing water to an ozone treatment vessel 22 having a closed structure; purifying the water 17 to be treated, in the presence of high concn. ozone 7, in the ozone treatment vessel 22; and transferring oxygen 5 formed by the reduction of ozone 7 and excess ozone 7 from the ozone treatment vessel 22 to an aerobic aeration vessel 19 through an oxygen/ozone recovery line 26, to effectively utilize the oxygen 5 and the excess ozone 7, to improve purification efficiency of the water to be treated 17 and also to prevent unreacted ozone 7 from being released into the atmosphere.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water treatment facility for purifying domestic wastewater and the like.

[0002]

2. Description of the Related Art Domestic wastewater discharged from homes and industrial wastewater discharged from business establishments are collected in a wastewater treatment facility through sewers, subjected to various treatments and purified, and then discharged into rivers and the sea. Has been released.

FIG. 2 shows an example of conventional water treatment equipment. This water treatment equipment is used for purification (deodorization, decolorization, sterilization).
The reaction tank body 2 capable of storing the treated water 1 to be treated, the bubble generating means 3 provided at the inner bottom of the reaction tank body 2 and having a large number of gas discharge ports, and the oxygen by compressing and compressing the air 4 5
The oxygen generating means 6 for extracting the ozone, the ozone generating means 8 for generating the ozone 7 by discharging the oxygen 5 extracted by the oxygen generating means 6, and the ozone 7 generated by the ozone generating means 8. An air feeding means 9 such as a compressor for feeding to the bubble generating means 3, an ozone removing means 10 such as an ozone killer capable of decomposing ozone 7, an air 12 existing in the non-liquid storage space 11 of the reaction tank main body 2, And exhaust means 13 such as a blower for supplying various gases including ozone 7 to the ozone removing means 10.

A trough-shaped treated water inlet 14 is provided on one side of the reaction tank body 2, and a hole-shaped treated water inlet is provided on the other side of the reaction tank body 2 at a position lower than the treated water inlet 14. An exit 15 is provided.

A treated water feed means 16 such as a pump for feeding the treated water 1 into the reaction tank body 2 is connected to the treated water inlet 14.

When the treated water 1 is purified by the water treatment facility shown in FIG. 2, the treated water feed means 16 is operated to feed the treated water 1 from the treated water inlet 14 into the reaction tank body 2.

Next, the oxygen generating means 6, the ozone generating means 8 and the air feeding means 9 are operated to feed the ozone 7 to the bubble generating means 3, and the ozone is discharged from the bubble generating means 3 and stored in the reaction tank body 2. The treated water 1 is purified (deodorized, decolorized, and sterilized) by the foamed ozone 7 that ventilates the treated water 1.

The treated water 1 which has been purified is the reaction tank body 2
In response to the inflow of the unpurified treated water 1 into the inside, the treated water 1 flows out of the reaction tank main body 2 through the treated water outlet 15 and is discharged into the river or the sea.

Further, the exhaust means 13 is actuated to aerate the air 12 in the non-liquid storage space 11 in the reaction tank main body 2 and the treated water 1 stored in the reaction tank main body 2 in an unreacted state. A gas such as 7 is fed to the ozone removing means 10, the ozone 7 is reduced by the ozone removing means 10 to oxygen 5, and the concentration of the ozone 7 contained in the air 12 to be blown into the atmosphere is reduced to 0.1 ppm or less. keeping.

[0010]

However, in the water treatment equipment shown in FIG. 2, since the inside of the reaction tank body 2 is open to the atmosphere by the treated water inlet 14 and the treated water outlet 15, the treated water 1 When performing purification (deodorization, decolorization, sterilization), the exhaust means 13 having a large capacity is continuously operated to control the negative pressure inside the reaction tank body 2, and unreacted ozone 7 is released into the atmosphere at a high concentration. You need to avoid being winded.

Oxygen 5 reduced from ozone 7 is
It is released into the atmosphere without being used effectively.

The present invention has been made in view of the above situation, and provides a water treatment facility capable of efficiently purifying treated water and effectively utilizing oxygen reduced from ozone. The purpose is.

[0013]

To achieve the above object, in the water treatment facility according to claim 1 of the present invention, an ozone treatment tank having a closed structure capable of storing treated water, and ozone capable of generating ozone. In the ozone treatment tank, the generation means, the gas-liquid feeding means for mixing the ozone from the ozone generation means and the treated water to be purified and feeding the mixture to the ozone treatment tank, and the ozone treatment tank reduced from the ozone by purifying the treated water And an oxygen / ozone recovery pipe for supplying a gas such as excess ozone and excess ozone to the preceding tank in which the treated water to be supplied to the ozone processing tank is stored.

In the water treatment equipment according to claim 2 of the present invention, in addition to the structure of the water treatment equipment according to claim 1 of the present invention, a pressure for detecting the internal pressure of the non-liquid storage space in the ozone treatment tank. It is provided with a detection means and a gas discharge valve that operates based on a signal from the pressure detection means and that can adjust the flow rate of the gas flowing through the oxygen / ozone recovery pipe.

In the water treatment facility according to claim 3 of the present invention, in addition to the configuration of the water treatment facility according to claim 1 or 2, the water treatment facility is stored in an ozone treatment tank. A liquid level detecting means for detecting the liquid level of the treated water and a liquid discharge valve which operates based on a signal from the liquid level detecting means and causes the treated water to flow out from the ozone treatment tank to the outside are provided.

In the water treatment equipment according to claim 4 of the present invention, in addition to the configuration of the water treatment equipment according to any one of claims 1 to 3, the gas in the ozone / oxygen recovery pipe is An ozone concentration controller capable of detecting the ozone concentration of the ozone generator and increasing or decreasing the ozone generation amount of the ozone generating means based on the detected value.

In any of the water treatment facilities according to the first to fourth aspects of the present invention, ozone and treated water to be purified are mixed by a gas-liquid feeding means to an ozone treatment tank having a closed structure. It is sent and the treated water with high ozone concentration is purified in the ozone treatment tank.

Gases such as oxygen and surplus ozone which are reduced from ozone by the purification of the treated water are sent from the ozone treatment tank to the preceding tank through the oxygen / ozone recovery pipe,
Efficient use of oxygen and ozone, improvement of purification efficiency of treated water, and prevention of release of unreacted ozone into the atmosphere.

In the water treatment facility according to the second aspect of the present invention, the opening of the gas discharge valve is adjusted based on the signal from the pressure detecting means to increase or decrease the flow rate of the gas flowing through the oxygen / ozone recovery pipe. Then, the internal pressure of the non-liquid storage space of the ozone treatment tank is maintained in a state suitable for purification of treated water by ozone.

In the water treatment equipment according to the third aspect of the present invention, the opening of the liquid discharge valve is adjusted based on the signal from the liquid level detecting means, and the flow rate of the treated water flowing out from the ozone treatment tank is increased. To maintain the liquid level of the treated water stored in the ozone treatment tank in a state suitable for purifying the treated water by ozone.

In the water treatment facility according to claim 4 of the present invention, the ozone concentration controller increases or decreases the ozone generation amount by the ozone concentration controller based on the detected value of the ozone concentration in the oxygen / ozone recovery pipe. Optimize the amount of ozone supplied to treated water and prevent excessive generation of ozone.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of an embodiment of the water treatment facility of the present invention. This water treatment facility comprises an adjusting tank 18 for performing various pretreatments on the treated water 17 to be purified,
From the aerobic aeration tank 19, the filtration tank 20, and the treatment tank 21, the ozone treatment tank 22 having a closed structure capable of storing the treated water 17, the ozone generation means 23 capable of generating the ozone 7, and the ozone generation means 23. Of the ozone 7 and the treated water 17 stored in the treatment tank 21 are mixed and fed to the ozone treatment tank 22, and the ozone 7 is purified by purifying the treated water 17.
The gas 25 composed of oxygen 5 and excess ozone 7 in the ozone treatment tank 22 is reduced from the ozone treatment tank 22.
And an oxygen / ozone recovery pipe 26 for supplying air to the aerobic aeration tank 19 for aerating the ozone 7 in the treated water 17 to be supplied to.

The ozone treatment tank 22 has a closed treatment tank body 27, a pressure detector 29 for detecting the internal pressure of the non-liquid storage space 28 in the treatment tank body 27, and a signal from the pressure detector 29. Oxygen / ozone recovery pipe 26 that operates based on
A gas discharge valve 30 capable of adjusting the flow rate and pressure of the gas 25 flowing through the tank, and the treated water 17 stored in the treatment tank main body 27.
And a liquid discharge valve 32 that operates based on a signal from the liquid level meter 31 and that causes the treated water 17 to flow out from the ozone treatment tank 22 to the outside.

When the detected pressure of the internal pressure of the non-liquid storage space 28 exceeds the upper limit of the predetermined pressure range, the pressure detector 29 outputs an open signal to the gas discharge valve 30 to output the gas discharge valve 30. Is operated to the open side and the valve opening degree corresponding to the internal pressure is maintained, so that the gas 25 stored in the non-liquid storage space 28 has a predetermined flow rate and pressure (about the amount required to diffuse air in the aerobic aeration tank). Under a condition of reducing the pressure to 1 Kg / cm ² G), the oxygen / ozone recovery pipe 26 is controlled to flow in the aerobic aeration tank 19, and the detected pressure is within a predetermined pressure range. When it becomes lower than the lower limit value of, the closing signal is output to the gas discharging valve 30 to operate the gas discharging valve 30 to the closing side, and the gas 25 flowing in the oxygen / ozone recovery pipe 26 flows. It is designed to shut off.

The liquid level gauge 31 detects the liquid level of the treated water 17 stored in the treatment tank main body 27, and when the detected liquid level exceeds the upper limit of a predetermined liquid level range, the liquid discharge valve An open signal is output to 32 to operate the liquid discharge valve 32 to the open side to increase the outflow rate of the treated water 17 stored in the treatment tank main body 27 from the ozone treatment tank 22 to the outside. ,
When the detected liquid level becomes lower than the lower limit value of the predetermined liquid level range, a closing signal is output to the liquid discharge valve 32 to operate the liquid discharge valve 32 to the closing side, and the ozone treatment tank 22
The flow rate of the treated water 17 flowing from the outside to the outside can be throttled or stopped.

The ozone generating means 23 sucks and pressurizes the air 4 into compressed air 33, and the compressor 34.
Air 33 connected to the compressor and delivered from the compressor 34
An oxygen generator 35 for extracting oxygen 5 therein, and an ozone generator 36 connected to the oxygen generator 35 and discharging the oxygen 5 fed from the oxygen generator 35 to generate ozone 7. It is composed by.

The gas-liquid supply means 24 has a dissolving pump 37 and mixes and dissolves the ozone 7 supplied from the ozone generator 36 with the treated water 17 sucked from the treatment tank 21. Can be sent to the ozone treatment tank 22.

The oxygen / ozone recovery pipe 26 connects the upper part of the processing tank main body 27 of the ozone processing tank 22 and the ozone aeration pipe 39 arranged at the lower part of the aerobic aeration tank 19 and having a large number of gas discharge ports. Therefore, a gas 25 such as oxygen 5 in the ozone treatment tank 22 and excess ozone 7 which is reduced from the ozone 7 by purification of the treated water 17 is guided to the ozone aeration pipe 39, and from the gas discharge port of the ozone aeration pipe 39. It can be discharged and aerated in the treated water 17 stored in the aerobic aeration tank 19.

Further, the oxygen / ozone recovery pipe 26 is provided with an ozone concentration controller 40 at a predetermined position.

The ozone concentration controller 40 detects the ozone concentration of the gas 25 flowing through the oxygen / ozone recovery pipe 26,
When the detected value exceeds the upper limit value of the predetermined ozone concentration range, the ozone generator 36 sends an instruction signal to reduce the amount of ozone generated by the ozone generator 36 based on the detected value.
To the ozone generator 36, and controls the ozone generator 36 so that the generation of ozone 7 is suppressed.

When the detected value becomes lower than the lower limit value of the predetermined ozone concentration range, an instruction signal for increasing the amount of ozone generated by the ozone generator 36 based on the detected value is sent to the ozone generator 36. The ozone generator 36 controls the ozone generator 36 so that the ozone 7 is output.

When the treated water 17 is purified by the water treatment facility shown in FIG. 1, when the ozone generating means 23 and the gas-liquid feeding means 24 are operated, the dissolving pump 37 causes the adjusting tank 18 and aerobic aeration. Processing tank 2 through tank 19 and filtration tank 20
Gas mixture 3 in which treated water 17 stored in 1 and ozone 7 fed from ozone generator 36 are mixed and dissolved
8 is fed to the ozone treatment tank 22 having a closed structure, and the treated water 17 having a high ozone concentration is purified (deodorized, decolorized, sterilized) in the ozone treatment tank 22.

At this time, the gas 25 such as oxygen 5 and excess ozone 7 reduced from the ozone 7 in the ozone treatment tank 22 by purifying the treated water 17 flows from the ozone treatment tank 22 to the oxygen / ozone recovery pipe 26. The gas is sent to the ozone aeration pipe 39 of the aerobic aeration tank 19 through the gas, and is discharged in the form of bubbles from the gas discharge port of the ozone aeration pipe 39.

As a result, the gas 25 such as oxygen 5 and surplus ozone 7 is treated water 1 stored in the aerobic aeration tank 19.
The treated water 17 stored in the aerobic aeration tank 19 is ventilated to the pretreatment for purification, and the effective use of oxygen 5 and ozone 7 and the purification efficiency of the treated water 17 are improved. And the unreacted ozone 7 is prevented from being blown into the atmosphere.

When the pressure of the non-liquid storage space 28 of the ozone treatment tank 22 is out of the predetermined pressure range, the opening degree of the gas discharge valve 30 is adjusted based on the pressure detection signal output from the pressure detector 29. By increasing / decreasing the flow rate of the gas 25 flowing through the oxygen / ozone recovery pipe 26, the internal pressure of the non-liquid storage space 28 of the ozone treatment tank 22 is maintained in a state suitable for purifying the treated water 17 by the ozone 7.

When the liquid level of the treated water 17 stored in the ozone treatment tank 22 is out of the predetermined liquid level range, the liquid level meter 31
Based on the liquid level detection signal output from the liquid discharge valve 32
The opening degree of the treated water 17 is adjusted and the flow rate of the treated water 17 flowing out from the ozone treatment tank 22 is increased or decreased, so that the liquid level of the treated water 17 in the ozone treatment tank 22 is suitable for purification of the treated water 17 by the ozone 7. Held in a state.

When the ozone concentration of the gas 25 flowing through the oxygen / ozone recovery pipe 26 is out of the predetermined concentration range,
An instruction signal for increasing or decreasing the amount of ozone 7 generated by the ozone generator 36 is output from the ozone concentration controller 40 to the ozone generator 36, and the amount of ozone 7 supplied to the treated water 17 is optimized. Excessive generation of ozone 7 is suppressed.

As described above, in the water treatment equipment shown in FIG. 1, the ozone 7 and the treated water 17 to be purified are mixed by the dissolving pump 37, and the mixed gas / liquid 38 is fed to the ozone treatment tank 22. Then, the treated water 17 in a high ozone concentration state is purified in the ozone treatment tank 22 having a closed structure, and by the purification of the treated water 17, oxygen 5 reduced from the ozone 7 in the ozone treatment tank 22 and surplus ozone 7 and the like. The gas 25 is sent to the ozone aeration pipe 39 of the aerobic aeration tank 19 through the oxygen / ozone recovery pipe 26, so that the effective use of oxygen 5 and ozone 7 and the purification efficiency of the treated water 17 are improved. It is also possible to prevent the unreacted ozone 7 from being blown into the atmosphere.

The water treatment equipment of the present invention is not limited to the above-mentioned embodiment, and oxygen such as oxygen reduced from ozone and surplus ozone are sent to the adjusting tank. It goes without saying that the connection of the oxygen / ozone recovery pipe can be changed and other various changes can be made without departing from the scope of the present invention.

[0041]

As described above, according to the water treatment facility of the present invention, various excellent effects as described below can be obtained.

(1) In any of the water treatment facilities according to the first to fourth aspects of the present invention, ozone and a treated water to be purified are mixed by a gas-liquid supply means to form an ozone having a closed structure. Oxygen / ozone is recovered from the ozone treatment tank by sending it to the treatment tank, purifying the treated water with a high ozone concentration in the ozone treatment tank, and recovering the oxygen and excess ozone reduced from the ozone by the purification of the treated water. Air is sent to the previous tank via a pipe to effectively utilize oxygen and ozone, so that the purification efficiency of treated water is improved and unreacted ozone is not blown into the atmosphere.

(2) In the water treatment facility according to claim 2 of the present invention, the gas flowing through the oxygen / ozone recovery pipe is adjusted by adjusting the opening of the gas discharge valve based on the signal from the pressure detecting means. Since the flow rate is increased or decreased, the internal pressure of the non-liquid storage space of the ozone treatment tank can be maintained in a state suitable for purification of treated water by ozone.

(3) In the water treatment equipment according to claim 3 of the present invention, the liquid discharge valve is opened / closed based on a signal from the liquid level detecting means to discharge the treated water flowing out from the ozone treatment tank to the outside. Since the outflow amount is increased or decreased, the liquid level of the treated water stored in the ozone treatment tank can be maintained in a state suitable for purifying the treated water by ozone.

(4) In the water treatment facility according to claim 4 of the present invention, the control signal output from the ozone concentration controller is used based on the detected value of the ozone concentration of the gas in the oxygen / ozone recovery pipe. Since the amount of ozone generated by the ozone generating means is increased or decreased, the amount of ozone supplied to the treated water can be optimized and excessive generation of ozone can be suppressed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of an embodiment of a water treatment facility of the present invention.

FIG. 2 is a configuration diagram of an example of a conventional water treatment facility.

[Explanation of symbols]

4 air 5 oxygen 7 ozone 17 Treated water 19 Aerobic aeration tank (previous tank) 22 Ozone treatment tank 23 Ozone generating means 24 Gas-liquid feeding means 25 gas 26 Oxygen / Ozone Recovery Tube 28 Non-liquid storage space 29 Pressure detector (pressure detection means) 30 gas discharge valve 31 Liquid level meter (liquid level detection means) 32 Liquid discharge valve 40 Ozone concentration controller

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yohei Obikin             1-6-2 Marunouchi, Chiyoda-ku, Tokyo Stone             Kawashima Harima Heavy Industries Co., Ltd. head office annex F-term (reference) 4D050 AA15 AB03 AB04 AB06 BB02                       BC02 BD02 BD06 BD08 CA15                       CA17                 4G042 CE04

Claims (4)

[Claims] 1. An ozone treatment tank having an enclosed ozone treatment tank capable of storing treated water, ozone generating means capable of generating ozone, and ozone from the ozone generating means mixed with treated water to be purified. Gas-liquid feeding means for feeding to the ozone treatment tank, and gas such as oxygen in the ozone treatment tank and excess ozone that is reduced from ozone by purification of the treated water to be fed to the ozone treatment tank. A water treatment facility equipped with an oxygen / ozone recovery pipe for sending air to the tank at the previous stage where the water is stored. 2. A pressure detection means for detecting an internal pressure of a non-liquid storage space in an ozone treatment tank, and a flow rate of a gas which operates based on a signal from the pressure detection means and which flows through an oxygen / ozone recovery pipe. The water treatment facility according to claim 1, further comprising: 3. A liquid level detection means for detecting the liquid level of the treated water stored in the ozone treatment tank, and an apparatus for operating the treated water from the ozone treatment tank to the outside by operating on the basis of a signal from the liquid level detection means. The water treatment facility according to claim 1 or 2, further comprising a liquid discharge valve for causing the liquid to flow out. 4. An ozone concentration controller for detecting the ozone concentration of the gas in the ozone / oxygen recovery pipe and increasing or decreasing the ozone generation amount of the ozone generating means based on the detected value. Water treatment equipment according to any one of 1.