JPH0631285A - Ozone contact tank for water treatment - Google Patents

Abstract

PURPOSE:To improve the absorption efficiency of ozone in rapid progress by increasing the height dimension of a reaction section and a retention section without increasing the supply pressure of ozonized air. CONSTITUTION:The upper section of a vertical cylinder 4 is divided by a divider 15, and intake water is introduced on the upper section of the divider 15, while ozonized air is introduced to the lower section of the divider 15. A short tube 16 is set to run through the divider 15, and an air/liquid downward flow cylinder 4 with an air vent 17 opened below the divider 15 of the short tube 16 is attached to a water tank.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ozone contact tank suitable for treating clean water.

[0002]

2. Description of the Related Art FIGS. 9 (a) and 9 (b) are flow charts of water treatment accompanied by ozone injection. In FIG. 9 (a), ozone is injected into water intake to remove off-flavors and colors and to remove organic chlorine. After the treatment for reducing the compounds, the water is treated in the order of coagulation sedimentation, sand filtration, live activated carbon and chlorine sterilization.

FIG. 9B shows that ozone is injected after coagulation and precipitation. That is, ozone exerts a deodorizing action and the like due to its strong oxidizing power, but the timing of ozone injection is various.

FIG. 10 is a principle diagram of a conventional ozone contact tank, in which the inflow water is made to flow downward in the reaction section 101. On the other hand, the ozone generated by the ozone generator 102 is generated by the reaction unit 1
It is emitted from the diffuser 103 installed at the bottom of 01 and rises as bubbles. Therefore, ozone is in good contact with the downward flow and is absorbed. After this, the retention section 10
4 promotes absorption of ozone.

By the way, ozone is not allowed to release exhaust ozone into the atmosphere due to its toxicity. When there is a possibility that the discharged ozone will be discharged, as shown in the figure, the discharged ozone treatment device 10
5, it is necessary to provide detoxification treatment with this device.

[0006]

The reaction section 1 shown in FIG.
The ozone absorption rate of water in 01 and the accumulating section 104 is about 85%, and the remaining 15% is sent to the waste ozone treatment device 105. The waste ozone treatment device 105 consumes electric energy to perform a detoxification process.

That is, about 15% of ozone generated by consuming electric energy in the ozone generator 102 is not utilized,
Moreover, consumption of electric energy for the detoxification process is not preferable in terms of operating cost. Therefore, it is effective to increase the height of the reaction section 101 and the retention section 104 to extend the reaction time and the retention time, but the apparatus becomes large. Further, since the water pressure applied to the diffuser 103 at the bottom of the reaction part increases in proportion to the depth, the supply pressure of ozone to the diffuser 103 increases, and the energy for generating the supply pressure increases.

Therefore, an object of the present invention is to provide a technique capable of dramatically improving the absorption efficiency of ozone by increasing the height of the reaction section and the retention section without increasing the supply pressure of ozonized air. To do.

[0009]

In order to achieve the above object, the present invention is to partition the upper part of a vertically oriented cylinder or tube with a partition plate, introduce water to be treated above the partition plate, and to partition the partition plate. Ozonized air is introduced below the partition plate, at least one short pipe is penetrated through the partition plate, and an air hole is formed below the partition plate of this short pipe, and a downward flow pipe of gas or liquid or The pipe is attached to a water tank such as a reaction chamber, a retention chamber, and a landing well.

[0010]

The ozone-adsorbed air is mixed with the water flowing through the short pipe through the air holes and the mixture is caused to flow downward in the gas-liquid downward flow tube or inside the pipe to promote the adsorption of ozone.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of the reference numerals.
FIG. 1 is a side sectional view of a water treatment ozone contact tank according to a first embodiment of the present invention. The water treatment ozone contact tank 1 includes a first water intake part 2, a first short pipe array plate 3, and a first gas. The liquid downflow cylinder 4, the reaction chamber 5, the second water intake part 6, the second short pipe array plate 7, the second gas-liquid downflow cylinder 8, and the retention chamber 9 are connected in series as shown in the figure, and the reaction chamber 5 And the second
The water intake portion 6 is communicated with the through hole 10, the water intake pipe 11 is connected to the first water intake portion 2, and the ozonized air introduction pipe 12 is connected to the first gas-liquid downflow cylinder 4 directly below the first short pipe array plate 3. And the reaction chamber 5
The ozonized air re-introduction pipe 13 is connected to the ceiling 5a of the above and the second gas-liquid downflow cylinder 8 immediately below the second short pipe array plate 7, and the exhaust gas fan 14 is provided in the ozonized air re-introduction pipe 13. It becomes.

FIG. 2 is an enlarged view of the first and second short pipe arrangement plates. In the first short pipe arrangement plate 3, a plurality of short pipes 16 having a diameter of several tens of mm are arranged through a partition plate 15 and these short pipes are arranged. The pipe 16 is characterized in that an air hole 17 having a diameter of several mm is formed below the partition plate 15. The second short pipe array plate 7 has the same configuration as the first short pipe array plate 3, and thus the description thereof is omitted.

FIG. 3 is a sectional view taken along line 3-3 of FIG. 2, in which the short pipe 16 has eight air holes 17 per circumference. However, this number is determined in consideration of equal flow of ozonized air from the outside to the inside of the short pipe 16, and the number can be changed arbitrarily.

FIG. 4 is a sectional view taken along line 4-4 of FIG.
The gas-liquid downflow cylinder 4 is arranged in the reaction chamber 5 and communicates with the reaction chamber 5 through a through hole 18. Similarly, the second gas-liquid downflow cylinder 8 also communicates with the retention chamber 9 through the through hole 19.

The operation of the water treatment ozone contact tank having the above structure will be described below. In FIG. 1, the water in the water intake section 2 is blocked by the partition plate 15 (see FIG. 2), flows only from the upper end of the short pipe 16, and falls by gravity. On the other hand, as shown in FIG. 2, since the ozonized air is blown below the partition plate 15, an air pool is formed in this portion, and the water surface falls below the air hole 17 of the short pipe 16.

FIG. 5 is a diagram for explaining the operation. The ozonized air blown from the air holes 17 toward the center of the short pipe 16 is mixed well with the downward flowing water, and this gas-liquid mixture is the first gas. The liquid flows downward toward the bottom of the downflow cylinder 4, during which the first stage ozone absorption is performed.

Then, in FIG. 1, the gas-liquid mixture passing through the through hole 18 rises in the reaction chamber 5 and is absorbed by ozone in the second stage. Most of the ozone is absorbed by water in the second stage, but some unabsorbed ozone becomes waste ozone, and forms an air pool in the upper part of the reaction chamber 5. The exhaust ozone is drawn by the exhaust gas fan 14 and blown into the upper portion of the second gas-liquid downflow cylinder 8 via the ozonized air reintroduction pipe 13. Similarly to FIG. 5, mixing of water and ozonized air and ozone absorption (corresponding to the third stage) are performed in the second water intake unit 6, the second short pipe array plate 7, and the second gas-liquid downflow cylinder 8 and continue. The fourth stage of ozone absorption is performed in the retention chamber 9.

As described above, the first embodiment of the present invention (water treatment ozone contact tank 1) shown in FIG. 1 is the first and second short pipe array plates 3 and 7 and the first and second gas-liquid downwards. In the flow tubes 4 and 8, forced mixing of ozone and water and effective absorption of ozone by the downward flow of the mixture are performed.

The downward flow velocity of the mixture in the first embodiment is preferably 0.15 to 0.5 m / s, and the flow velocity of ozonized air passing through the air holes 17 is preferably 5 to 10 m / s. is there.

FIG. 6 is a diagram showing a second embodiment of the present invention.
The second water intake section 6, the second short pipe array plate 7, and the second gas-liquid downflow cylinder 8 are replaced by one Venturi type gas-liquid transfer pipe 20. If the front end of the ozonized air re-introduction pipe 13 faces the throttle portion 21 and the exhaust ozone pressurized by the exhaust gas fan 14 is injected at high speed, a negative pressure region can be formed on the downstream side of the throttle portion 21. By the action, the mixture (water mixed with ozone) in the reaction chamber 5 is drawn and mixed. Therefore, although the structure is simple, the third stage ozone absorption is performed.

FIG. 7 is a diagram showing a third embodiment of the present invention, which has a simple structure in which a gas-liquid downflow pipe 24 is provided side by side with one ozone contact tank 23, which is suitable for a small-scale treatment facility. There is. The gas-liquid downflow pipe 24 has a flange welded to a pipe having an appropriate diameter,
It suffices if the short tube array plate 25 is sandwiched between these flanges, and the manufacturing is easy.

FIG. 8 is a diagram of a fourth embodiment of the present invention, in which a gas-liquid downflow pipe 24 is inserted from above into a water tank 26 such as a landing well, and ozone or exhaust ozone is blown below the short pipe array plate 25. In addition, a part of the water in the water tank 24 is pumped up by the pump 27 and injected onto the short tube array plate 25. The ozone treatment is performed by circulating the water in the water tank 26 with the pump 27. Ozone treatment equipment can be added later to existing water treatment equipment.

[0023]

As described above, according to the present invention, the downward flow of water is formed by the short tube of the partition plate, and the ozonized air is mixed into this water through the air holes of the short tube, and this mixture is mixed. Since the gas-liquid downward flow tube or pipe is made to flow down, the ozone absorption efficiency of water is high.

Further, since the diffuser conventionally arranged at the bottom of the reaction chamber is abolished and ozonized air is blown just below the partition plate at a high position, the ozone blowing pressure is small and electric energy can be saved. .

As described above, by adopting the short tube array plate and the gas-liquid downflow cylinder / tube of the present invention, the reaction section (chamber) and the retention section (chamber) can be formed without increasing the supply pressure of ozonized air. By increasing the height dimension, the ozone absorption efficiency can be dramatically improved.

[Brief description of drawings]

FIG. 1 is a side sectional view of an ozone contact tank for water treatment according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of first and second short tube arrangement plates according to the first embodiment of the present invention.

3 is a sectional view taken along line 3-3 of FIG.

4 is a sectional view taken along line 4-4 of FIG.

FIG. 5 is an explanatory view of the operation of the first embodiment of the present invention.

FIG. 6 is a diagram of a second embodiment of the present invention.

FIG. 7 is a diagram of a third embodiment of the present invention.

FIG. 8 is a diagram of a fourth embodiment of the present invention.

FIG. 9: Flow chart of water treatment with ozone injection

FIG. 10: Principle diagram of conventional ozone contact tank

[Explanation of symbols]

1 ... Ozone contact tank for water treatment, 3, 7 ... Short tube array plate, 4,
8 ... Gas-liquid downflow cylinder, 5 ... Reaction chamber, 9 ... Retention chamber, 11 ... Intake pipe, 12 ... Ozonized air introduction pipe, 15 ... Partition plate, 16
... Short tube, 17 ... Air hole, 23 ... Ozone contact tank, 26 ... Water tank.

Claims (1)

[Claims] 1. A structure in which the upper portion of a vertically oriented cylinder or tube is partitioned by a partition plate, water to be treated is introduced above the partition plate, and ozonized air is introduced below the partition plate. At least one short pipe is vertically penetrated through the plate, and a gas-liquid downflow cylinder or pipe where an air hole is opened below the partition plate of this short pipe is used as a reaction chamber, a retention chamber, a landing well, etc. Is an ozone contact tank for water treatment attached to the water tank, wherein ozonized air is mixed into the water flowing down the short pipe through the air holes, and the mixture is mixed into a gas-liquid downward flow tube or pipe. An ozone contact tank for water treatment, characterized in that the inside is made to flow downward and transferred to the water tank.