JP2001157802A - Manhole-type water-wash anti-foaming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anti-foaming device which reduces an ozone leakage and upgrades its maintenance efficiency with the miniaturization of the device. SOLUTION: In the anti-foaming device of a water spray system, a manhole 19 which is used for inspection and carrying in a device through, a mounting seat 24 for anti-foaming water piping 23, an electrode mounting seat 5 and a manhole lid 20 with a drain pipe connecting aperture 25 are provided. In addition, the anti-foaming water piping 23 with an anti-foaming nozzle 23A fitted to the tip is installed at the mounting seat 24 for the anti-foaming water piping 23 and an electrode bar 9 is installed at the electrode mounting seat 5 respectively, in such a way that both piping 23 and electrode bar 9 are freely drawable. Further, a waste ozone extracting pipe 21 is fitted, in a freely removable manner, to the drain pipe connecting aperture 25. In addition, the anti- foaming water piping 23 has the anti-foaming nozzle 23A of a reaction vessel insertion system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray cleaning device provided in an ozone reaction tank, and more particularly, to a manhole type water washing and defoaming device connected to a waste ozone treatment device.

[0002]

2. Description of the Related Art In recent years, reclaimed water utilization facilities using secondary sewage water as raw water have been widely constructed. Reduction of sewage odor and chromaticity is indispensable to use secondary sewage water as recycled water, and ozone treatment is often used as a treatment method therefor.

In this case, ozone is produced as a gas,
Generally, gas containing ozone is converted into fine bubbles using a diffuser or injector, and reacted with the water to be treated in a bubble column. In the water to be treated, substances that cause foaming such as anionic surfactants are contained. Often remain, and therefore, bubbles are often generated on the water surface as the bubbles rise due to gas-liquid mixing.

On the other hand, unreacted waste ozone gas is released to the atmosphere after reduction treatment to oxygen. When bubbles generated on the water surface flow into the waste ozone treatment device, the pressure loss of the device increases and emergency stop such as ozone leakage occurs. Leading to serious failures. For this reason, a defoaming device is provided on the inflow side of the waste ozone treatment device.

[0005] This defoaming apparatus is selected in consideration of the substance that causes foaming by employing a method such as heating, centrifugal separation, and water spraying. A water spray method (hereinafter referred to as “water washing”) is generally employed because of easy-to-bubble foam.

[0006] The prior art washing and defoaming device will be described below with reference to FIG.

FIG. 3 is a block diagram showing the configuration of a conventional washing and defoaming apparatus.

In FIG. 1, the RC reactor 1 is provided with a manhole cover 2, an embedded pipe 4 for connecting an exhaust ozone extraction pipe 3, and an electrode mounting seat 5. For this reason,
When the RC reactor 1 is installed, it is necessary to give an appropriate opening instruction in the civil engineering work to be performed in advance.

Among these equipment, the exhaust ozone extraction pipe 3 is connected to a defoaming tower 7 via a valve 6 to attract exhaust ozone gas in the RC reactor 1 into the defoaming tower 7. .

Further, an electrode rod 9 for detecting bubbles 8 generated on the water surface is mounted on the electrode mounting seat 5, and three wraps 10 and a water stop plate 1 are mounted on the RC reaction tank 1.
1 are welded.

The defoaming water pump 1 is provided in the defoaming tower 7.
The two defoaming nozzles 13 for spraying the non-foaming pressure water by the activation of 2 are provided. A mist removing device 14 is mounted on the defoaming tower 7. The mist removing device 14 is connected to a processing device (not shown) through an exhaust ozone pipe 15.

A drain discharge device 16 having a water trap function is attached to a lower portion of the defoaming tower 7 through an output pipe 17 in order to maintain a negative pressure in the defoaming tower 7.

The drain discharge device 16 is further connected to a dissolved ozone removing device 18 so that defoamed water is discharged through the dissolved ozone removing device 18.

In the conventional water defoaming apparatus having such a configuration, the ozone gas discharged in the RC reactor 1 is
It is drawn into the defoaming tower 7 through the exhaust ozone extraction pipe 3,
After the mist is removed by the mist removing device 14, the exhausted ozone gas passes through an exhausted ozone pipe 15 to a processing device (not shown).
Led to.

On the other hand, the bubbles 8 generated on the water surface in the RC reactor 1 are detected by the electrode rod 9, and the defoaming water pump 12 is activated by the detection, and the non-foaming pressure water is supplied from the defoaming nozzle 13. Is sprayed, and only the bubbles induced in the main body of the defoaming tower 7 via the exhaust ozone extraction pipe 3 are broken to remove the bubbles.

The defoamed water from which the bubbles have been removed overflows from the drain discharge device 16 and is then discharged from the defoaming device via the dissolved ozone removing device 18.

[0017]

However, in such a conventional washing and defoaming device, the opening of the RC reaction tank 1 is not only a manhole for inspection and carrying in the machine, but also a filling hole for extracting exhausted ozone. Since the openings are individually secured for the inlet pipe, the electrode rod for bubble detection, etc., the number of openings in the reaction tank increases, and as a result, ozone leakage problems easily occur in the sealing of the manhole cover. Was causing it.

Further, since the defoaming nozzle 13 is provided in the defoaming tower 7, only the bubbles attracted to the main body of the defoaming tower 7 are broken. Therefore, the foam generated on the water surface is
Since the gas must always pass through the pipe laid between the discharge port of the reaction tank 1 and the fire turret 7, the state in which the reaction tank 1 is filled with bubbles may continue, which may lead to the exhaust ozone extraction. This causes the pipe pressure loss of the pipe 3 to increase significantly.

As a result, if the pipe pressure loss exceeds the capability of the exhaust ozone gas inducing device, the internal pressure of the reaction tank 1 increases, and there is a risk of ozone leakage from the sealing portion at the opening of the reaction tank 1 or the drain discharge water spray section. This has caused a problem in that the destruction of water at the drain discharge section leads to serious ozone leakage.

Therefore, as a countermeasure, auxiliary devices such as the drain discharge device 16 and the dissolved ozone removing device 18 are attached as described above, but the installation space of the defoaming device is increased by that amount, and It was uneconomical in terms of space.

Furthermore, the installation of the drain discharge device 16 ensuring a high water level and the provision of the defoaming nozzle 13 in the defoaming tower 7 have increased the overall height of the device. In addition, maintenance of the defoaming nozzle was troublesome because maintenance personnel had to enter the inside through the inspection manhole provided in the defoaming tower main body and perform maintenance work inside the defoaming tower. .

It is an object of the present invention to provide a defoaming apparatus that can greatly reduce the possibility of ozone leakage, achieve downsizing of equipment, and improve maintenance efficiency.

[0023]

SUMMARY OF THE INVENTION A manhole type water washing and defoaming apparatus according to the present invention comprises a manhole provided on an ozone reaction tank, and a manhole covering the manhole and at least an exhaust ozone outlet and a mounting seat for defoaming water piping. A defoaming water pipe having a defoaming nozzle at its tip is detachably attached to a mounting seat of the defoaming water pipe, and a drain is provided to the drain ozone outlet. The ozone extraction tube is detachably attached.

Further, in the manhole type washing and defoaming apparatus according to the present invention, the exhaust ozone extracting tube is connected to a mist removing device which forms a closed system with the ozone reaction tank. is there.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
A description will be given based on FIGS.

FIG. 1 is a block diagram showing an embodiment of a defoaming apparatus according to the present invention, and FIG. 2 is an explanatory view showing a part of a side surface of the defoaming apparatus viewed from an arrow A in FIG. It is.

In FIGS. 1 and 2, the same parts as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted. The following description is different from the conventional example of the defoaming apparatus of the present invention. The parts will be mainly described.

First, in FIG. 1, a defoaming apparatus according to the present invention is installed in a reinforced concrete reaction tank 1. The reaction tank 1 is provided with a manhole 19 for both inspection and carrying in of the equipment, and the water stop plate 11 and the ramp 10 are welded. Here, only one opening of the reaction tank 1 is required.

The manhole 19 is covered with a manhole cover 20.
The mounting seat 22 of the exhaust ozone extraction pipe 21, the mounting seat 24 of the defoaming water pipe 23, the electrode mounting seat 5 (FIG. 2), the drain pipe connection port 25 of the mist removing device 14, and the like are welded.

The piping unit composed of the defoaming water pipe 23 and the defoaming nozzle 23A has a flange for the defoaming water pipe 23.
The electrode for foam detection is composed of an electrode holder 26 and an electrode rod 9 and is screwed to the electrode mounting seat 5 as shown in FIG. . Further, the exhaust ozone extracting pipe 21 is detachably connected to an exhaust ozone extracting port 22A provided in the mounting seat 22 thereof.

The mist removing device 14 is washed by operating a washing valve 28 from a washing pipe 27 branched from the defoaming water pipe 23, and the reaction tank 1 is passed through a drain pipe 29 of the mist removing device 14. It is configured to be discharged to

Next, the operation of the thus constructed washing and defoaming apparatus according to the present invention will be described.

In FIG. 1, the ozonized gas diffused from the bottom of the reaction tank 1 rises while being consumed in the water to be treated, and bubbles 8 are generated on the water surface. This phenomenon is particularly remarkable when there are many substances that cause foaming in the water to be treated, such as the secondary treated water of human waste and the secondary treated water of sewage.

The bubbles generated on the water surface are detected by the electrode rod 9 (FIG. 2), and when a start command is issued to the pressure water supply device such as the defoaming water pump 12 (FIG. 3), the defoaming nozzle 23A is turned on. The pressurized water is sprayed directly on the water surface to break bubbles 8 on the water surface.

Further, the exhausted ozone gas containing unreacted ozone in the reaction tank 1 needs to be decomposed to a concentration that can be released to the atmosphere.
4, the mist is removed to an ozone treatment device (not shown).
The mist is washed from the more branched washing pipe 27 by operating the washing valve 28 manually or automatically, and the mist is directly discharged to the reaction tank 1 via the mist removing device drain pipe 29.

Therefore, most of the bubbles generated on the water surface are broken by the pressurized water sprayed from the defoaming nozzle 23A. Since the diameter becomes 600 mm and the flow rate of the suction part can be set to about 0.5 m / s even in a reaction tank of a large-scale ozone facility, for example, as in the conventional apparatus shown in FIG. 3 can be operated without sucking.

During maintenance, the defoaming water pipe 23 and the defoaming nozzle 23A are pulled out from the defoaming water pipe mounting seat 24, and the electrode rod 9 is pulled out from the electrode mounting seat 5, thereby facilitating maintenance. I have.

The mist removal device drain pipe is connected to the reaction tank 1
Since the closed drain pipe 29 is directly connected to the water tank, there is no open water sealing part, and there is no possibility of ozone leakage due to water sealing destruction with respect to the pressure fluctuation of the reaction tank 1.

The drain ozone extraction pipe 21 and the mist removal device 14 are arranged vertically, and the drain ozone extraction pipe 21 is a drain pipe, so that the mist removal apparatus drain pipe 29 and the mist removal apparatus drain connection port 25 are omitted. May be.

[0040]

According to the present invention described above, the risk of ozone leakage from the reaction tank can be greatly reduced and the size of the equipment can be reduced by using the manhole and the water washing and defoaming device in common. In addition, since the equipment to be maintained is easily extracted, the maintenance staff does not need to enter the manhole, thereby significantly improving the maintenance efficiency.

Further, since the defoaming water is directly sprayed on the water surface, auxiliary devices such as a drain discharge device and a dissolved ozone removing device are not required, so that the installation space of the defoaming device can be largely saved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a manhole type washing and defoaming apparatus according to the present invention.

FIG. 2 is an explanatory diagram showing a part of a side surface of the manhole-type water-washing and defoaming apparatus viewed from an arrow A in FIG. 1;

FIG. 3 is a block diagram showing a configuration of a conventional washing and defoaming device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 RC reaction tank 2, 20 Manhole cover 3, 21 Ozone discharge pipe 4 Embedding pipe for connection 5 Electrode seat 6 Valve 7 Defoaming tower 8 Foam 9 Electrode rod 10 Trap 11 Water stop plate 12 Defoaming water pump 13 Defoaming nozzle 14 Mist removing device 15 Discharge ozone tube 16 Drain discharge device 17 Output tube 18 Dissolved ozone removing device 19 Manhole 22, 24 Mounting seat 23 Defoaming water pipe 25 Drain pipe connection port 26 Electrode holder 27 Washing pipe 28 Washing valve 29 drain pipe

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Soichiro Nakano 66-2 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture F-term (reference) 4D011 BA04 BA16 4D050 AA15 AA16 AB03 AB04 BB02 BD02 BD08 CA20

Claims (2)

[Claims] 1. A manhole provided on an ozone reaction tank, and a manhole cover which covers the manhole and has at least an exhaust ozone outlet and a mounting seat for a defoaming water pipe. A defoaming water pipe provided with a defoaming nozzle at its tip is detachably attached to the seat, and an exhaust ozone extraction pipe is detachably attached to the exhaust ozone extraction port. Manhole type washing defoaming equipment. 2. The manhole type flushing and defoaming apparatus according to claim 1, wherein a mist removing device that forms a closed system with the ozone reaction tank is connected to the exhausted ozone drawing pipe.