JP3587297B2 - Decomposition method and apparatus for naphthalene - Google Patents

Description

【００１９】
【発明の効果】
以上説明したように、本発明のナフタレンの分解方法によれば、ナフタレン単体またはナフタレンを含む物質に対しＳｔｅｎｏｔｒｏｐｈｏｍｏｎａｓ属（ステノトロフォモナス）の菌を用いて、前記ナフタレンを分解するので、ナフタレンが効果的に分解され、臭気や排水を対象とする場合には、ナフタレンが確実に除去される。
【００２０】
また、本発明のナフタレンの分解装置によれば、少なくともＳｔｅｎｏｔｒｏｐｈｏｍｏｎａｓ属（ステノトロフォモナス）の菌が生育する分解槽を有し、該分解槽をナフタレン単体またはナフタレンを含む物質が槽内に導入されるように構成するとともに上記菌の生育環境をｐＨ５．８〜８．５、望ましくは６．５〜７．５に調整するので、上記菌を最適の環境で生育でき、したがって、上記分解槽に導入される対象中のナフタレンを確実かつ効果的に分解除去することができる。
【図面の簡単な説明】
【図１】本発明の一実施形態の脱臭装置を示す概略図である。
【符号の説明】
１ 脱臭槽
１ｂ 水回収部
２ 臭気導入管
３ 担体
４ 排気ダクト
５ 水回収パイプ
６ 貯水タンク
７ 揚水管
８ ポンプ
９ 散水装置
１０ ｐＨ測定器[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a naphthalene decomposition method and a naphthalene decomposition method for effectively decomposing and removing naphthalene from odors and aqueous solutions containing naphthalene.
[0002]
2. Description of the Related Art
Odors and effluents generated in foundries, chemical factories, pharmaceutical factories and the like sometimes contain naphthalene, and a method for effectively removing this naphthalene is required for environmental protection. 2. Description of the Related Art Conventionally, there are various methods for removing certain components contained in odors and wastewater, for example, a method using a filter and a method utilizing the action of decomposing microorganisms.
However, it is difficult to efficiently collect and remove naphthalene from odors and the like by using a conventional filter, which is not practically sufficient. In addition, in the method utilizing the decomposing action of microorganisms, it is possible to decompose and remove ammonia and hydrogen sulfide contained in odors and wastewater to a certain extent, but if the odor or the like contains naphthalene, this naphthalene can be effectively used. The naphthalene removal efficiency is not sufficient.
[0003]
The present invention has been made in view of the above circumstances, and has as its object to effectively decompose naphthalene contained in odor and wastewater by using a microorganism that can grow using naphthalene as a carbon source.
[0004]
[Problems to be solved by the invention]
In order to solve the above problems, a first invention of the method for decomposing naphthalene of the present invention is to decompose naphthalene alone or a substance containing naphthalene by using a bacterium of the genus Stenotrophomonas (Stenotrophomonas). It is characterized by.
[0005]
The method for decomposing naphthalene of the second invention is characterized in that, in the first invention, the substance containing naphthalene is an odor or an aqueous solution.
[0006]
The method for decomposing naphthalene according to the third invention is the method according to the first or second invention, wherein a bacterium belonging to the genus Stenotrophomonas (Stenotrophomonas) and one or more species belonging to the genus Pseudomonas (Pseudomonas) or the genus Comamonas (Comamonas) are used. It is characterized by decomposing naphthalene using bacteria.
[0007]
Further, the naphthalene decomposition apparatus of the present invention has a decomposition tank in which at least bacteria of the genus Stenotrophomonas (Stenotrophomonas) grow, and the decomposition tank contains a substance containing naphthalene alone or naphthalene. And the growth environment of the bacterium is adjusted to pH 5.8 to 8.5, preferably 6.5 to 7.5.
[0008]
The present invention is directed to naphthalene alone or a substance containing naphthalene as described above. A typical example of the substance containing naphthalene is an aqueous solution such as odor and wastewater. However, the present invention is not limited to this, and can be widely applied to a substance containing naphthalene and wanting to decompose and remove this naphthalene. The substance containing naphthalene may include other odorous components and aqueous solution-soluble components, and is not limited to those containing only naphthalene. Further, the concentration of naphthalene in the substance containing naphthalene is not limited.
[0009]
For the above-mentioned decomposition target, bacteria of the genus Stenotrophomonas (Stenotrophomonas) are used. The bacterium uses naphthalene as a nutrient, that is, a carbon source, and degrades naphthalene by its physiological activity. The fungus is usually available in nature and can be grown by culture.
In addition, for the above-mentioned decomposition target, at least a bacterium of the genus Stenotrophomonas (Stenotrophomonas) is necessary, but a bacterium containing another bacterium may be used. For example, in addition to bacteria of the genus Stenotrophomonas (Stenothrophomonas), one or more bacteria of the genus Pseudomonas (Pseudomonas) or the genus Comamonas (Comamonas) can be used. By mixing these bacteria, there is an advantage that these bacteria coexist when decomposing naphthalene, and a more stable treatment can be performed.
[0010]
Usually, the substance to be decomposed is introduced into a decomposition tank in which bacteria of the genus Stenotrophomonas (Stenotrophomonas) are growing, and is brought into contact with microorganisms. In the decomposition tank, as described above, in addition to the bacteria of the genus Stenotrophomonas (Stenotrophomonas), other bacteria, for example, one or more bacteria of the genus Pseudomonas (Pseudomonas) or the genus Comamonas (Comamonas) grow. Bacteria other than the genus Stenotrophomonas may be separated and grown in another decomposition tank to degrade substances other than naphthalene.
[0011]
In the case of a large-scale apparatus, the decomposition tank can be formed by digging a hole in the ground, and this hole can be used as the decomposition tank, or an appropriate container can be used as the decomposition tank. A plurality of decomposition tanks may be connected in series or in parallel, and the decomposition target may be different in each decomposition tank.
In the decomposition tank, the microorganisms are usually grown on a microorganism carrier accommodated in the tank. As the microorganism carrier, generally used inorganic or organic materials such as zeolite, charcoal, slag, ceramics, activated carbon, and PVA gel can be used. Activating the bacteria on the carrier can be carried out by adding bacteria previously cultured elsewhere to the carrier.
[0012]
In the above-mentioned tank, an environment suitable for the growth of the above-mentioned bacteria is desirable. From this viewpoint, the pH in the tank is desirably adjusted to 5.8 to 8.5, and further adjusted to 6.5 to 7.5. It is more desirable to do so. This pH adjustment is performed by, for example, adjusting the amount and concentration of the odor and the aqueous solution introduced into the decomposition tank, that is, adjusting the treatment amount to be decomposed, or adjusting the amount of water sprayed when watering the decomposition tank. It can also be carried out by adding a pH adjuster to the decomposition tank. In the decomposition tank having the pH adjusting function, growth of bacteria, that is, decomposition of naphthalene can be performed under appropriate conditions.
In the present invention, in order to maintain the environment of the decomposition tank in a good condition, in addition to the above-mentioned pH, the water content can be adjusted by watering, and the water sprinkled can be collected and used again for watering. The method of watering and the method of recovery at this time are not particularly limited.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIG.
The deodorizing apparatus has a box-shaped decomposition tank 1 having a water-permeable shelf 1a at a lower portion thereof, and an odor introduction pipe 2 connected to a ceiling. The odor introduction pipe 2 is connected to an odor source and a blower (not shown). The microbial carrier 3 is accommodated in the decomposition tank 1 so as to be supported by the shelf 1a, and a portion below the shelf 1a of the decomposition tank 1 is allocated to a water recovery section 1b.
[0014]
Further, an exhaust duct 4 that extends to the side is provided below the shelf 1a of the decomposition tank 1, and the exhaust duct 4 is connected to an exhaust location (not shown).
In addition, one end of a water recovery pipe 5 disposed outside the decomposition tank 1 is connected to the water recovery section 1b, and the other end of the water recovery pipe 5 is disposed near the decomposition tank 1. It is connected to the water storage tank 6. A lower end of the water storage tank 6 is provided with a tip end of a water pumping pipe 7 having one end connected to a suction side of a water sprinkling pump 8 provided outside. Is connected.
Note that a pH measuring device 10 is disposed in the decomposition tank 1.
[0015]
Next, the operation of the deodorizing device will be described.
At the beginning of the operation, a culture solution (not shown) containing bacteria of the genus Stenotrophomonas is added to the inside of the decomposition tank 1 in advance. Then, an odor containing naphthalene is introduced into the decomposition tank 1 through the odor introduction pipe 2, and the pump 8 is operated to pump water for watering in the water storage tank 6 by the water pumping pipe 7, and is directed to the carrier 3 by the watering apparatus 9. Water to deodorize. A part of the water spray passes between the carriers 3, moves from the shelf 1 a to the water receiver 1 b, and circulates by being returned to the water storage tank 6 through the water recovery pipe 5.
By the above operation, the naphthalene component in the odor is decomposed in the decomposition tank 1 by the bacteria, and the processing gas from which the naphthalene is decomposed and removed is sent from the exhaust duct 4 to the outside of the decomposition tank 1.
[0016]
On the other hand, the pH meter constantly measures the pH in the decomposition tank 1, and adjusts the pH of the circulating water to adjust the growth environment so that the pH falls within a predetermined range. That is, when the pH is higher than the predetermined range, an acid is added, and when the pH is lower than the predetermined range, an alkali is added to neutralize the pH, and the pH in the decomposition tank 1, that is, the pH of the growth environment of the bacteria is added. To adjust. Thereby, the activity of the bacterium becomes active, and naphthalene is effectively decomposed and removed.
[0017]
【Example】
To the carrier 3 of the decomposition tank 1 shown in the above embodiment, Stenotrophomonas genus (Stenotrophomonas) cultured in advance was added. For comparison, a comparative decomposition tank to which activated sludge was added was separately prepared.
An odor containing naphthalene was passed through each of the decomposition tanks to perform a deodorization treatment.
At this time, the odor gas component concentration and the odor concentration at the entrance and the exit were measured and are shown in the table. At this time, the pH of the decomposition tank was 7.2 in the example and 7.2 in the comparative decomposition tank.
As a result of the above treatment, as is clear from the table, in the method using the decomposition tank to which Stenotrophomonas sp. Was added (the method of the present invention), naphthalene was effectively removed, and the odor concentration was significantly reduced. On the other hand, in the method using the comparative decomposition tank to which the above-mentioned bacteria were not added (conventional method), naphthalene was hardly removed, and therefore, the decrease in odor concentration was small. Therefore, it was clarified that naphthalene was effectively removed only when bacteria of the genus Stenotrophomonas were used.
[0018]
[Table 1]

[0019]
【The invention's effect】
As described above, according to the method for decomposing naphthalene of the present invention, naphthalene is decomposed against a substance containing naphthalene alone or a substance containing naphthalene by using a bacterium belonging to the genus Stenotrophomonas (Stenotrophomonas). When the odor and wastewater are targeted, naphthalene is reliably removed.
[0020]
Further, according to the naphthalene decomposition apparatus of the present invention, there is provided a decomposition tank in which at least bacteria of the genus Stenotrophomonas (Stenotrophomonas) grow, and the substance containing naphthalene alone or naphthalene is introduced into the tank. And the growth environment of the bacteria is adjusted to pH 5.8 to 8.5, preferably 6.5 to 7.5, so that the bacteria can grow in an optimal environment. Naphthalene in the target to be introduced can be reliably and effectively decomposed and removed.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a deodorizing device according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Deodorizing tank 1b Water recovery part 2 Odor introduction pipe 3 Carrier 4 Exhaust duct 5 Water recovery pipe 6 Water storage tank 7 Pumping pipe 8 Pump 9 Water sprinkler 10 pH meter

Claims (5)

A method for decomposing naphthalene, wherein the naphthalene is decomposed by using a bacterium of the genus Stenotrophomonas against naphthalene alone or a substance containing naphthalene. 2. The method for decomposing naphthalene according to claim 1, wherein the substance containing naphthalene is an odor or an aqueous solution. The naphthalene is decomposed using a bacterium belonging to the genus Stenotrophomonas and at least one bacterium belonging to the genus Pseudomonas (Pseudomonas) or the genus Comamonas (Comamonas). 3. The method for decomposing naphthalene according to 1.). It has a decomposition tank in which at least bacteria of the genus Stenotrophomonas (Stenotrophomonas) grow, and the decomposition tank is configured so that a substance containing naphthalene alone or naphthalene is introduced into the tank, The growth environment is pH 5.8-8. An apparatus for decomposing naphthalene, which is adjusted to 5 . at least Stenotrophomonas A decomposition tank for growing bacteria of the genus (Stenothrophomonas), wherein the decomposition tank is configured such that naphthalene alone or a substance containing naphthalene is introduced into the tank; Is adjusted to pH 6.5 to 7.5, wherein naphthalene is decomposed.

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