JP2000176247A - Waste ozone decomposing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste ozone decomposing device capable of efficiently decomposing waste ozone by using an ozone decomposing catalyst an capable of easily replacing the catalyst having lost its decomposing capacity. SOLUTION: In the waste ozone decomposing device arranging an ozone decomposing catalyst layer 6 inside a tank body 1, the gas flow passage 5 passing downward through the ozone decomposing catalyst layer 6 is provided by providing a gas inlet 3 at above the ozone decomposing catalyst layer 6 and providing a gas outlet 4 under the ozone decomposing catalyst layer 6. The catalyst becoming small by the wear can be retained and also replacing only upper side catalyst having lost the decomposing capacity is possible since the wear of the ozone decomposing catalyst such as activated carbon 8 is generated at the upper part of the layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for decomposing ozone discharged from an ozone treatment apparatus or equipment such as an ozone contact pond.

[0002]

2. Description of the Related Art Conventionally, in the field of water treatment such as water purification treatment and wastewater treatment, the strong oxidative decomposition action of ozone is utilized.
It performs sterilization, removal of chromatic components such as iron and manganese, decomposition of cyanide and phenol, and final treatment of wastewater.

[0003] At that time, the exhausted ozone discharged from the ozone treatment device or equipment is introduced into the exhausted ozone decomposing device and brought into contact with the ozone decomposing catalyst to be decomposed into oxygen and an oxidizing catalyst. To be released.

[0004]

However, in the conventional exhaust ozone decomposition apparatus, the exhaust ozone (or the exhaust gas containing the same) flows below the ozone decomposition catalyst layer and flows upward in the layer. The ozone decomposing catalyst in the lower part of the layer, which has a high contact rate with ozone, is easily consumed, and depending on the type, the exhausted catalyst can remain with its ozone decomposing ability lost or become smaller and become a vent hole in the catalyst support material. Either. Therefore, both the ozone decomposition efficiency and the catalyst utilization rate are poor, and it is not easy to replace the catalyst which has lost the ozone decomposition ability.

The present invention solves the above-mentioned problems, and provides an exhaust ozone decomposing apparatus capable of effectively decomposing exhaust ozone by effectively using an ozone decomposition catalyst and easily replacing a catalyst having no decomposition ability. It is intended for that purpose.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a waste ozonolysis apparatus having an ozonolysis catalyst layer disposed inside a tank body, wherein a gas inflow section is provided above the ozonolysis catalyst layer. , A gas outlet is provided below, and a gas flow path that flows downward through the ozone decomposition catalyst layer is formed.

[0007] According to the above structure, the exhausted ozone flows downward through the ozone decomposition catalyst layer, so that the ozone decomposition catalyst in the upper part of the layer is easily consumed, and the ozone decomposition ability is lost.
Or become smaller.

However, since the reduced ozonolysis catalyst is supported by the catalyst layer itself, this type of ozonolysis catalyst will exert its catalytic ability for a longer period of time than before. Further, the ozone decomposing catalyst of the type that loses the ozone decomposing ability only has to be replaced at an appropriate time only in the upper layer portion, and it is easy to replace and can be used more effectively than before.

That is, no matter which type of ozone decomposing catalyst is used, the exhausted ozone can be decomposed more efficiently and efficiently than in the past, and in the latter case, replacement is easy.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In the waste ozonolysis apparatus shown in FIG. 1, the tank body 1 has a lid 2 that covers the upper opening, and is configured as a closed type. The tank 1 has a gas inlet 3 provided at an upper portion and a plurality of gas outlets 4 provided at a lower portion.
Thus, a vertical flow path 5 in the tank is formed, and an ozone decomposition catalyst layer 6 is provided in the middle of the flow path 5 in the tank.

More specifically, the ozone decomposition catalyst layer 6 is disposed on a mesh-shaped catalyst support 7 which is arranged along the direction traversing the flow path 5 in the tank and whose peripheral edge is in sliding contact with the peripheral surface of the tank. And is located below the gas inlet 3 and above the gas outlet 4.

The operation of the above configuration will be described. Exhaust gas 9 containing exhausted ozone is introduced into the tank 1 through the gas inlet 3, descends through the inside of the tank flow path 5, passes through the ozone decomposition catalyst layer 6, and is decomposed by contact with the activated carbon 8 to decompose ozone. Flows out into the atmosphere from the gas outlet 4 together with oxygen as a decomposition product of the gas.

As the introduction of the exhaust gas 9 is continued, the activated carbon 8 having a greater chance of contact with the exhausted ozone is reduced in order from the upper activated carbon 8.
, And stays without slipping through the catalyst support 7 to exhibit the catalytic ability, so that the efficiency of the exhausted ozone decomposition in the ozone decomposition catalyst layer 6 is kept high.

When the efficiency of decomposing ozone is reduced to some extent, the activated carbon 8 is replaced. At this time, the cover 2 is opened and the replacement operation can be easily performed through the upper opening. Only the activated carbon 8 in the upper layer which has become smaller may be replaced.

Instead of the above-mentioned granular activated carbon 8, a manganese oxide catalyst 9 generally used as an ozone decomposition catalyst is used.
May be used. In this case, since the upper manganese oxide catalyst 9 having the greatest chance of contact with the exhausted ozone loses the ozone decomposition ability in order, when the efficiency of the exhausted ozone decomposition is reduced, only the upper manganese oxide catalyst 9 may be replaced. .

Further, as shown in FIG. 2, the manganese oxide catalyst 9 may be laminated on the lower part, and the granular activated carbon 8 may be laminated on the upper part, so that the ozone decomposition catalyst layer 6 may have a two-layer structure. In this case, the activated carbon 8 in the upper part, which has a large chance of contact with the exhausted ozone,
From the top, and loses the ozone decomposition ability in order from the top of the manganese oxide catalyst 9, but the reduced activated carbon 8 remains supported not only by the layer of the activated carbon 8 below but also by the layer of the manganese oxide catalyst 9. Therefore, when the waste ozone decomposition efficiency decreases, only the layer of the activated carbon 8 and the upper part of the manganese oxide catalyst 9 need to be replaced.

As described above, no matter which type of ozone decomposing catalyst is used, it is possible to effectively decompose exhausted ozone by using the catalyst more effectively than before, and to replace only the catalyst which has lost the ozone decomposing ability. Replacement work becomes easier and maintenance costs can be reduced.

[0018]

As described above, according to the present invention, the exhaustion of the ozone decomposition catalyst occurs at the upper part of the layer by forming the gas flow path that flows downward through the ozone decomposition catalyst layer. The exhausted ozone can be efficiently decomposed by holding the catalyst which has been reduced by exhaustion, and only the catalyst having lost the ozone decomposing ability can be replaced, so that the maintenance cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a waste ozone decomposing device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a state in which an ozone decomposition catalyst layer has a two-layer structure in the waste ozone decomposition apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank body 3 Gas inflow part 4 Gas outflow part 5 Gas flow path 6 Ozone decomposition catalyst layer 9 Exhaust gas (exhausted ozone)

Claims (1)

[Claims] 1. An exhaust ozonolysis device having an ozonolysis catalyst layer disposed inside a tank body, wherein a gas inflow portion is provided above the ozonolysis catalyst layer, and a gas outflow portion is provided below the ozonolysis catalyst layer. An exhaust ozone decomposer characterized by forming a gas flow path flowing downward.