JPH019679Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for oxidizing and purifying wastewater by aerating it with ozone gas.

[Prior art]

Conventionally, an ozone oxidation treatment method has been adopted as one of the methods for treating various types of wastewater. When treating wastewater with this method, ozone gas is diffused from below the treated water tank, but in conventional equipment, ozone gas passes through the stored wastewater once in the tank and then is exhausted, so ozone gas is sufficiently effective. It was not used and there was a lot of waste.

For this reason, the conventional ozone oxidation treatment process for wastewater not only requires a large amount of money to prepare ozone gas, but also requires a pollution-free treatment device for wasteful discharged ozone gas.

[Purpose of invention]

The object of the present invention is to provide a rational wastewater ozone oxidation treatment device that solves the above-mentioned problems of conventional devices.

[Structure of the idea]

This invention consists of a closed type first reaction tank and a closed type second reaction tank.
The reaction tanks are connected in series, and the wastewater is allowed to flow from the first reaction tank to the second reaction tank, and ozone gas is supplied to the second reaction tank to aerate the wastewater, and the water is poured onto the water surface of the second reaction tank. A system configured to introduce the discharged exhaust ozone gas onto the water surface of the first reaction tank and suck it in with a submersible aeration pump installed in the first reaction tank to aerate the wastewater in the first reaction tank. It is.

〔Example〕

An embodiment of the present invention will be explained based on FIG.
The reaction tank 4 is arranged so that its bottom plate is at approximately the same height, and the upper communication pipe 8 and the lower communication pipe 3
is contacted by.

A wastewater inflow pipe 1 and an exhaust pipe 11 for exhaust gas e above the water surface are connected to the ceiling wall of the first reaction tank 2, and a submersible pump 9 is disposed below the water surface. In addition, 2′
is a partition plate, which is suspended from the ceiling wall so that its tip is below the water surface.

A treated water outflow pipe 5 is connected to the upper part of the side wall of the second reaction tank 4, and an aeration device 7 for dispersing ozone gas is provided below the water surface.

In the figure, 6 is an ozone gas introduction pipe, and 10 is an intake pipe of the submersible aeration pump 9, which are provided so that their suction ports are above the water surface. Furthermore, 12 is an activated carbon adsorption device for removing residual ozone gas in the exhaust gas e.

Next, to explain the operation of the above embodiment, the waste water a
are a wastewater inflow pipe 1, a first reaction tank 2, a lower communication pipe 3,
While passing through the second reaction tank 4, the water is subjected to ozone oxidation treatment and flows out from the treated water outflow pipe 5 as treated water b. During this period, the ozone gas c is diffused into the second reaction tank 4 by the aeration device 7 and discharged onto the water surface, but this exhaust ozone gas d passes through the upper communication pipe 8 to the water surface of the first reaction tank 2. flows upward,
The first reaction tank 2 is sucked by the submersible aeration pump 9.
The exhaust gas e containing a small amount of residual ozone gas passes through the exhaust pipe 11 to the activated carbon adsorption device 1.
2 and released into the atmosphere as a harmless gas.

In this way, the waste water a and the ozone gas c flow through this device in a countercurrent manner, but the waste water a is subjected to the first preliminary oxidation treatment by the waste ozone gas d in the first reaction tank 2, and the second stage In the reaction tank 4, the second stage full-scale oxidation treatment is performed.

Therefore, since the unreacted ozone gas in the exhaust ozone gas d effectively participates in the oxidation reaction in the first reaction tank 2, the residual ozone in the exhaust gas e becomes a trace amount.
The ozone gas c supplied at the beginning can be used extremely effectively for oxidation treatment, and since it has a sealed structure, the ozone gas is directly connected to the equipment while it flows from the second reaction tank 4 to the first reaction tank 2. There is no need to worry about it leaking outside.

The submersible aeration pump 9 is provided with a gas-liquid ejector at its discharge port, and the pump and the ejector are disposed as one body submerged in water.

Next, FIG. 2 shows another embodiment of the present invention, in which the first reaction tank 2 and the second reaction tank 4 are formed by providing a partition wall 13 in the middle of a single tank. The drainage inside the first reaction tank 2 flows through the partition wall 1.
3 overflows and flows into the second reaction tank 4.

In the above embodiment, the waste water and ozone gas were configured to flow in a countercurrent manner, but a parallel system may be used, and an embodiment in which a plurality of first reaction vessels having the above structure are connected in series is also possible. Furthermore, in place of the activated carbon adsorption device 12, other conventionally known ozone removal devices may be used. Further, if desired, a gas-liquid contact device such as a packed tower may be provided in the middle of the wastewater inflow pipe 1 to bring the wastewater a into contact with the exhaust gas e for oxidation treatment. In this case, the ozone removal device may be omitted. There are things you can do.

[Effect of idea]

As mentioned above, the ozone treatment device of the present invention is
With a simple configuration, ozone gas can be used effectively for oxidation treatment, and there is no need to worry about ozone gas leaking directly outside the device, so the efficiency of ozone gas usage is significantly improved, and the burden of pollution-free treatment of exhaust gas is reduced. This has practical benefits such as reducing

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment of the present invention, and FIG. 2 is a sectional view of another embodiment. 1... Drainage inflow pipe, 2... First reaction tank, 2'...
... Partition plate, 3 ... Lower communication pipe, 4 ... Second reaction tank, 5 ... Treated water outflow pipe, 6 ... Ozone gas introduction pipe, 7 ... Diffusion device, 8 ... Upper communication pipe, 9 ... …
Submersible aeration pump, 10... Intake pipe, 11... Exhaust pipe, 12... Activated carbon adsorption device, 13... Partition wall.

Claims (1)

[Claims for Utility Model Registration] 1. A closed type first reaction tank having a submersible aeration pump under the water surface, and a closed type second reaction tank having an ozone gas diffuser under the water surface; The first reaction tank has a wastewater inlet at an appropriate location, an exhaust ozone gas outlet at an appropriate location above the water surface, and a treated water outlet below the water surface of the second reaction tank.
Further, the first reaction tank and the second reaction tank are arranged such that the space above the water surface thereof is communicated with each other by a sealed flow path, and the waste water in the first reaction tank can flow into the second reaction tank. A wastewater ozone treatment device characterized by: 2. The apparatus according to claim 1, wherein a waste water inlet of the first reaction tank and an exhaust ozone gas exhaust port are formed separately, and the exhaust port is connected to an activated carbon adsorption device. 3 partitioning the space above the water surface of the first reaction tank to form two compartments, and opening the suction port of the submersible aeration pump into the compartment communicating with the space above the water surface of the second reaction tank; The apparatus according to claim 1 or 2, wherein the exhaust port for the exhaust ozone gas is communicated with the other compartment.