JPH08229578A - Ozone catalystic reaction device - Google Patents

Abstract

PURPOSE: To enable to correspond to the operation in a wider range of the variation in the water quantity to be treated, by controlling the flow rate in an internal pipe to the required value for falling down of an ozonized air in the internal pipe. CONSTITUTION: Water to be treated is fed from an inflow pipe 21 for water to be treated into the inside of an internal pipe 2 and the ozonizing air is fed from an ozonizing air feed pipe 23 thereinto. The water to be treated falls down in the internal pipe 2 by a prescribed flow rate together with the ozonizing air and fed to a reaction layer 1. The water to be treated in the reaction layer 1 is taken out from a treated water taken-out pipe 22 at the upper part of the reaction layer 1 as treated water. A portion of the treated water is returned into the inflow pipe 21 for water to be treated through a return pipe 25 for water to be treated by a pump 5. The flow rate in the return pipe 25 for water to be treated is adjusted with a flow rate adjusting valve 6.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention is intended to enhance the decomposition efficiency of oxidizable substances in water to be treated in the water treatment field such as advanced water treatment, advanced sewage treatment, night soil treatment, industrial wastewater treatment and industrial water treatment. It relates to an ozone contact reactor used.

[0002]

2. Description of the Related Art Conventionally, in advanced water treatment, advanced sewage treatment, human waste treatment, industrial wastewater treatment, industrial water treatment, etc., treated water is produced by contacting treated water with ozone in an ozone contact reaction device. Is deodorized, decolorized, sterilized and oxidized.

FIG. 2 is a schematic view showing a conventional double-tube type ozone contact reactor. In FIG. 2, 1 is a reaction tank, 2 is an inner pipe, 21 is a treated water inflow pipe, 22 is a treated water withdrawal pipe,
Reference numeral 23 is an ozonized air supply pipe, 24 is an ozonized air discharge pipe, 3 is an ozone generator, 4 is an ozone decomposing device, and 71 is a flow meter. Further, in FIG. 2, solid arrows indicate the flow of water to be treated or treated water, and dotted arrows indicate the flow of ozonized air.

As shown in FIG. 2, the double-tube type ozone contact reaction apparatus has a structure in which an inner tube 2 is inserted into a reaction tank 1. The lower end of the inner tube 2 is arranged near the bottom of the reaction tank 1. A treated water inflow pipe 21 and an ozonized air supply pipe 24 are connected to the upper end of the inner pipe 2 by piping. The ozonized air supply pipe 23 is connected to the ozone generator 3 by piping. At the upper part of the reaction tank 1, a treated water outlet pipe 2
2 and the ozonized air discharge pipe 24 are connected to the pipe. The ozonized air discharge pipe 24 is connected to the ozone decomposing device 4 by piping. The treated water inflow pipe 21 has a flow meter 7
1 is provided.

In the double-tube type ozone contact reactor shown in FIG. 2, the treated water such as industrial wastewater is treated by the treated water inflow pipe 21.
From the inside to the inner pipe 2. The water to be treated sent into the inner pipe 2 is sent toward the lower end of the inner pipe 2 at a predetermined flow rate. On the other hand, the ozone generator 3 converts some of the oxygen contained in the gas sent from the outside into ozone to generate ozonized air. In the present invention, ozonized air refers to a gas containing ozone. The ozonized air generated by the ozone generator 3 is sent into the inner pipe 2 through the ozonized air supply pipe 24. At the upper end of the inner pipe 2, the ozonized air is mixed with the water to be treated and sent together with the water to be treated toward the lower end of the inner pipe 2. The flow velocity of the water to be treated in the inner pipe 2 is maintained at a predetermined flow velocity or more so that the ozonized air is sent to the lower end of the inner pipe 2 along with the water to be treated. The flow velocity of the water to be treated in the inner pipe 2 is calculated by dividing the flow rate value of the first flow meter 71 by the value of the inner cross-sectional area of the inner pipe 2. The water pressure applied to the bubbles of ozonized air becomes higher as it approaches the lower end of the inner tube 2. For this reason,
Ozone in the ozonized air is dissolved in the water to be treated as it goes down inside the inner tube 2. Ozone dissolved in the water to be treated reacts with harmful substances in the water to be treated and oxidizes and decomposes the harmful substances.

The water to be treated in the inner pipe 2 is sent from the lower end of the inner pipe 2 into the reaction tank 1. The ozonized air dissolved in the water to be treated becomes a bubble state as the water to be treated rises in the reaction tank, and is separated from the water to be treated. The water to be treated sent to the reaction tank 1 is taken out as treated water from the treated water take-out pipe 22 at the upper end of the reaction tank 1.

The ozonized air dissolved in the water to be treated becomes bubbles as the water to be treated rises in the reaction tank 1 and is separated from the water to be treated. The ozonized air separated from the water to be treated is the ozonized air discharge pipe 24 at the upper end of the reaction tank 1.
Through the ozone decomposing device 4. The ozone decomposing device 4 decomposes ozone in the ozonized air into oxygen, and then diffuses it into the atmosphere.

[0008]

In the conventional ozone contact reaction apparatus, since the ozonized air is dissolved in the water to be treated, it is necessary to maintain the flow velocity of the water to be treated in the inner pipe at a predetermined flow velocity or higher. When the flow velocity of the water to be treated in the inner pipe is low, the ozonized air cannot be sent to the lower end of the inner pipe, so that the ozonized air is not dissolved in the water to be treated.

However, generally, the supply amount (or the demand amount of treated water) of the treated water to be treated in the water treatment facility varies. In the conventional ozone contact reaction device, when the supply amount of the treated water to be treated decreases, the flow velocity of the treated water decreases and it becomes impossible to maintain the flow velocity higher than a predetermined flow velocity. Therefore, there is a problem that the conventional ozone contactor cannot sufficiently operate when the fluctuation of the supply amount of the treated water to be treated is wide.

An object of the present invention is to solve the above problems, and ozone capable of operating in response to a wider range of fluctuations in the amount of water to be treated to be treated. It is a catalytic reactor.

[0011]

According to the invention of claim 1,
(1) a reaction tank having a predetermined depth, (2) an inner pipe inserted into the reaction tank until the lower end reaches near the bottom of the reaction tank, and (3) pipe connection to the upper end of the inner pipe. An ozonized air supply mechanism, (4) a treated water inflow pipe connected to the upper end of the inner pipe, (5) a treated water take-out pipe connected to the upper end of the reaction tank, and (6) a reaction The treated water return pipe branched from the layer or the treated water take-out pipe and connected to the upper end of the treated water inflow pipe or the inner pipe, and (7) the treated water in the treated water return pipe, or the treated pipe. The ozone contact reaction device, which has a flow rate adjusting and transporting mechanism for controlling the flow rate of the treated water in the treated water return pipe while transporting it toward the upper end of the ozone treatment reactor.

[0012]

In the ozone contact reaction apparatus of the present invention, the process of dissolving and reacting ozonized air in the water to be treated supplied into the inner pipe is the same as in the prior art, and therefore its explanation is omitted.

The ozone contact reactor of the present invention has a treated water return pipe branched from the reaction layer or the treated water take-out pipe and connected to the upper end of the treated water inflow pipe or the inner pipe. A part of the treated water in the treated water outlet pipe is transported to the treated water inflow pipe or the upper end of the inner pipe through the treated water return pipe. The treated water in the treated water return pipe is transported to the treated water inflow pipe or to the upper end of the inner pipe by the flow rate adjusting transport mechanism. The flow rate of the treated water in the treated water return pipe is adjusted by the flow rate adjusting transport mechanism.

In the ozone contact reaction apparatus of the present invention, a part of the treated water is fed into the inner pipe by transporting a part of the treated water into the treated water inflow pipe or the upper end of the inner pipe and mixing with the treated water. It is possible to secure a certain amount of water flow. Further, in the ozone contact reactor of the present invention, the flow rate in the inner pipe can be always maintained at a certain value or more by adjusting and controlling the flow rate of the treated water in the treated water return pipe by the flow rate adjusting transport mechanism. . As a result, the ozone contact reaction device of the present invention requires the flow velocity in the inner pipe to allow the ozonized air to be sent to the lower end of the inner pipe even when the amount of water to be treated to be treated by the ozone contact reaction device is reduced. It becomes possible to hold and control the value.

[0015]

EXAMPLE FIG. 1 is a schematic explanatory view showing an example of the ozone contact reaction apparatus of the present invention. In FIG. 1, 25 is a treated water return pipe, 5 is a pump, 6 is a flow control valve, and 72 is a flow meter. In FIG. 1, solid arrows indicate the flow of water to be treated or treated water, and dotted arrows indicate the flow of ozonized air. In FIG. 1, the same parts as those in FIG.

As shown in FIG. 1, the treated water inflow pipe 21-
A treated water return pipe 25 is connected between the treated water discharge pipes 22. The treated water return pipe 25 is provided with a pump 5, a flow rate control valve 6 and a second flow meter 72. The first flow meter 71 is provided between the treated water outlet pipe 25 connection portion of the treated water inflow pipe 21 and the inner pipe 2 connection portion.

In the ozone contact reactor shown in FIG.
When the pump 5 is operated, a part of the treated water in the treated water outlet pipe 22 is transported into the treated water inflow pipe 21 through the treated water return pipe 25. The treated water sent into the treated water inflow pipe 21 is mixed with the treated water in the treated water inflow pipe 21, and then sent into the inner pipe 2. Therefore, the ozone contact reaction device of the present invention can secure the flow rate of the water supplied to the inner pipe 2 at a certain amount or more even if the supply amount of the water to be treated to be processed by the ozone contact reaction device is reduced. It will be possible.

The flow rate of the treated water in the treated water return pipe 25 is adjusted by the flow rate adjusting valve 6. The flow velocity of the water to be treated in the inner pipe 2 is
It can be controlled by adjusting the flow rate of the treated water in the treated water return pipe 25. The flow velocity of the water to be treated in the inner pipe 2 is controlled to be equal to or higher than the flow velocity value required to dissolve the ozonized air in the liquid to be treated.

In the present invention, the flow rate adjusting / transporting mechanism (pump and flow rate adjusting valve) is not limited to one provided in the treated water return pipe. For example, (1) a pump is provided between the reaction layer connection part and the treated water return pipe connection part of the treated water outlet pipe, (2) the first flow rate control valve in the treated water return pipe, and (3) the treated water outlet pipe. The second flow rate control valve may be provided on the outlet side of the treated water return pipe connection part. In this case, the flow rate value of the first flow rate control valve (that is, the amount of treated water that circulates in the ozone contact reaction device) is set to a value such that the flow rate value of the inner pipe necessary for dissolving the ozonized air is obtained. Adjust and control. The flow rate value of the second flow rate control valve (that is, the amount of treated water recovered from the ozone contact reaction device) is adjusted to the same value as the amount of the treated water to be treated in the ozone contact reaction device.

As a result, the ozone contact reaction apparatus of the present invention can be operated in response to a wide range of fluctuations in the amount of water to be treated to be treated by the ozone contact reaction apparatus.

In the present invention, the inlet side of the treated water return pipe 25 may be directly connected to the reaction layer 1 by piping instead of being branched from the treated water outlet pipe 22.

[0022]

EFFECT OF THE INVENTION In the ozone contact reactor of the present invention, (1) a part of the treated water is transported to the treated water inflow pipe or the upper end portion of the inner pipe by the flow rate adjusting transport mechanism and mixed with the treated water. In addition, (2) a wider range of fluctuations in the supply amount of the treated water to be treated by the ozone contact reaction device by adjusting and controlling the flow rate of the treated water transported in the treated water inflow pipe or the upper end of the inner pipe. It is possible to deal with the operation.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing an embodiment of an ozone contact reaction device of the present invention.

FIG. 2 is a schematic vertical sectional view of a conventional ozone contact reaction device.

[Explanation of symbols]

 1 Reaction Tank 2 Inner Pipe 25 Treated Water Return Pipe 5 Pump 6 Flow Control Valve 71, 72 Flow Meter

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Torataro Minegishi, Marunouchi 1-2-2, Chiyoda-ku, Tokyo Japan Steel Pipe Co., Ltd. (72) Takeshi Tsuji, 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside the Steel Pipe Co., Ltd. (72) Inventor Junji Tada 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Inside the Nippon Steel Pipe Co., Ltd.

Claims (1)

[Claims] 1. A reaction tank having a predetermined depth,
(2) An inner pipe inserted into the reaction tank until the lower end reaches near the bottom of the reaction tank, (3) an ozonized air supply mechanism pipe-connected to the upper end of the inner pipe, and (4) inner pipe. Treated water inflow pipe connected to the upper end of the reactor, (5) treated water outlet pipe connected to the upper end of the reaction tank, and (6) branched from the reaction layer or treated water outlet pipe, the treated water flow A treated water return pipe connected to the upper end of the inlet pipe or the inner pipe,
(7) A flow rate adjusting transport mechanism that transports the treated water in the treated water return pipe toward the treated water take-out pipe or the upper end of the inner pipe and adjusts the flow rate of the treated water in the treated water return pipe,
An ozone contact reaction device comprising: