JPS6033072B2 - Deodorizing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a deodorizing device that deodorizes odorized gas by using ozone and a solid filler in combination.

Conventionally, as this type of deodorizing device, there has been an adsorption deodorizing device using activated carbon.

However, when trying to deodorize exhaust gas from sewage and human waste treatment plants by adsorption with activated carbon, it is difficult to remove malodorous components with neutral acidity and basicity, such as methyl sulfide and methyl disulfide, from the exhaust gas. The disadvantage was that it deteriorated quickly. In addition, recently developed malodor adsorption and deodorization equipment using impregnated activated carbon, which has been specially processed, is used for acid gas, basic gas The desired overall deodorizing performance cannot be achieved unless at least four types of activated carbon, one for gas, one for sulfides, and one for general gas, are used in series, and a large amount of relatively expensive impregnated activated carbon is used. ,
The disadvantage was that the gas processing costs were relatively high. This invention was made in order to eliminate the drawbacks of the conventional methods as described above, and by using a combination of pre-treatment to remove specific components in the gas to be treated and treatment with ozone and bromide impregnants, it is possible to treat sewage and human waste. The purpose of the present invention is to provide a deodorizing device that can comprehensively and inexpensively deodorize odors generated in a treatment plant. An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a deodorizing tower, inside of which a hydrogen sulfide removal filler 2, an ammonia removal filler 3, a reactant 4, and an ozone decomposer 5 are placed in contact with the gas to be treated (white arrow) in the above order. are arranged in 6 is an ozonizer, and the ozonized air (black arrow) generated here passes through a diffuser 7 and is sent to the deodorizing tower 1 so that it is mixed into the treated gas after contacting the ammonia removal filler 3. Connected.

8 is a bulkhead; 9 is a duct on the inlet side of the processing gas; and 10' is a duct on the outlet side.

As the filler 2 for removing hydrogen sulfide, pellets or crushed iron oxide (iron hydroxide) or activated carbon impregnated with potassium iodide are preferable.

As the filler 3 for removing ammonia, it is preferable to use pellets or crushed activated carbon impregnated with hydrochloric acid or sulfuric acid. As the reactant 4, it is preferable to use a chemically stable carrier having a large specific surface area, such as activated carbon, impregnated with several percent of a water-soluble bromide such as hydrogen bromide, sodium bromide, or potassium bromide. The ozone decomposer 5 is preferably chassis shell activated carbon or activated carbon impregnated with heavy metal oxides such as iron oxide or manganese dioxide. Next, the operation will be explained.

The treated gas (
The white arrow) first comes into contact with the hydrogen sulfide removal filler 2 and the ammonia removal filler 3 in order, and most of hydrogen sulfide and ammonia, which are the main malodorous components in the gas to be treated, are removed. Next, the gas to be treated is mixed with the ozonized air released from the diffuser 7, and then brought into contact with the reactant 4. The malodorous substances in the gas to be treated are bromine (produced by the reaction between ozone and the reactant 4). It reacts with Br2) and hypobromic acid (HB) and is converted into a different substance. For example, methyl sulfide [(
CH3)2S] is indirectly oxidized and decomposed by ozone to become dimethyl sulfoxide when an impregnating agent impregnated with hydrogen bromide is used as the reactant 4, as shown in the chemical reaction formula below.

HBr+03→HBr○102...(1
) HB 10 (CH3) 2S → HBr 10 (CH3) 2SO
．．・…-(b) Also methyl mercaptan (CH3SH)
is oxidized to methanesulfonic acid according to the following formula.

Father 8 no 10 CH3SH → Chihito Br10 CH3S03 day.・・・
．． ...(m) Furthermore, methyl disulfide ((CH3)2S2)
is oxidized to methanesulfonic acid according to the following formula.

Maru m no 10 (CH3) 20 days 20 18 mr + next QS 03 days ...... (N
) The dimethyl sulfoxide and methanesulfonic acid produced above are odorless substances, and the purpose of deodorization has been achieved.

The above reaction equation (1) progresses efficiently and ozone is completely consumed, but as the deodorizing reaction product accumulates on the surface of the reactant 4, some of the added ozone remains unreacted. It passes through reactant 4.

However, the unreacted ozone comes into contact with the next ozone decomposer 5 and the ozone is removed.
The processing gas is removed to less than 0.01 square meters, and the processing gas is discharged from the outlet side duct 10. The ratio of ozone added to the gas to be treated is 3 to 5 times or more the concentration of the main malodorous substances contained in the gas to be treated after contact with the hydrogen sulfide removal filler 2 and the ammonia removal filler 3. Generally, 3 to 5 marks are sufficient.

Next, the results of tests conducted to confirm the excellent performance of the deodorizing device of the present invention will be described.

The odor treatment conditions are as shown in Table 1, and Table 2 shows the results of odor treatment for about 370 hours under these operating conditions. Table-1 Table-2 Concentration of malodorous components before/after deodorization (ppm)
In addition, in a device filled with only ordinary coconut shell activated carbon in the same volume as the four types of fillers in Table 1 (approximately 8 yen, 3.6 k9),
Methyl sulfide and methyl disulfide started to fail after less than 100 feeding hours.

Also, if ozone is not added under the conditions set in Table 1,
Similar to the case when only activated carbon was filled, rupture of methyl sulfide and methyl disulfide was observed, and the performance was unsatisfactory. In addition, in the case where only ordinary chassis shell activated carbon is filled into all filler filling points in the apparatus configured as shown in the figure, the activated carbon that comes into contact with the gas to be treated of the ozone mixture will ash and be consumed over time. Methyl disulfide was partially increased, and the deodorizing performance was insufficient. In the above embodiment, the deodorizing tower 1 is divided into two parts by the partition wall 8 so that the gas flow is turned back, but each filler may be arranged so that the gas flow is a straight flow. The structure of the deodorizing tower 1 can be changed as appropriate. Further, each filler is not limited to those exemplified above, and any filler can be selected as long as it has the function. As described above, according to the present invention, ozone is removed from the ozone-containing exhaust gas, which contains a high concentration of hydrogen sulfide and ammonia and also contains other malodorous components, after bringing it into contact with a filler for removing hydrogen sulfide and ammonia. Since the hydrogen bromide was added and brought into contact with the filler impregnated with hydrogen bromide,
It enables high-performance deodorization and has high practical value.

Also, since hydrogen sulfide and ammonia are removed in advance,
Ozone can be used effectively and processing costs can be reduced.

[Brief explanation of drawings]

The figure is a vertical sectional view of a deodorizing apparatus showing an embodiment of the present invention, in which 1 is a deodorizing tower, 2 is a packing material for removing hydrogen sulfide, 3 is a packing material for removing ammonia, 4 is a reactant, and 5 is an ozonolytic 6 is an ozonizer, and 7 is a diffuser.

Claims (1)

[Claims] 1. Two types of fillers that selectively separate hydrogen sulfide and ammonia in odorized gas, a diffuser that mixes ozone into the gas after contact with these fillers, and impregnation with bromide. 1. A deodorizing device comprising: a filler, and a gas to be treated is brought into contact with the filler in the above order. 2. The deodorizing device according to claim 1, wherein the bromide is hydrogen bromide or an alkali bromide. 3. The deodorizing device according to claim 1 or 2, wherein the carrier to which bromide is impregnated is activated carbon. 4 Claims 1 to 3, characterized in that an ozonolytic agent is provided after the bromide-impregnated filler.
The deodorizing device according to any one of paragraphs.