JPH08154667A - New microorganism kb1 and biodegradation of aromatic and/or volatile organochlorine compound using the same - Google Patents

Abstract

PURPOSE: To decompose aromatic compounds such as phenol and cresol and/or volatile organochlorine compounds such as trichloroethylene and dichloroethylene and to clean up contamination, by making Vibrio sp. KB1 act thereon. CONSTITUTION: This invention consists in making Vibrio sp. KB1(FERM-P-14643) act on a medium contaminated with aromatic compounds and/or volatile organochlorine compounds. This method is useful for blocleanup of effluents, waste liquors and air, being applicable to both closed and open systems, and the microorganism can be applied in an immobilized state on a carrier or various methods for promoting the growth of the microorganisms can also be applied.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel microbial strain belonging to Vibrio species and aromatic compounds such as phenol and cresol and / or volatile compounds such as trichlorethylene (TCE) and dichloroethylene (DCE) using the same. TECHNICAL FIELD The present invention relates to a biodegradation method of pollutants (polluting media) by a biodegradation treatment useful for the biodegradation treatment of substances contaminated with an organic chlorine compound, and particularly for purification of wastewater and waste liquid containing the same and air.

[0002]

2. Description of the Related Art In recent years, environmental pollution caused by organic chlorine compounds, which are harmful to living organisms and hardly decomposed, has become a serious problem. In particular, it is said that contamination by organochlorine compounds such as tetrachloroethylene (PCE), trichlorethylene (TCE) and dichloroethylene (DCE) has spread to a considerable extent in the soil of paper and pulp industry and precision machinery related industrial areas in Japan and overseas. This is considered, and many cases have been reported that were actually detected in environmental surveys. It is said that these organic chlorine compounds that remain in the soil dissolve in groundwater due to rainwater and spread to the surrounding area. Since such compounds are suspected to be carcinogenic and are extremely stable in the environment, pollution of groundwater used as a water source for drinking water is a major social problem.

From the above, purification of groundwater and the like by removing and decomposing organic chlorine compounds is an important issue from the viewpoint of environmental protection, and techniques necessary for purification have been developed.

For example, adsorption treatment with activated carbon and decomposition treatment with light or heat have been studied, but it is not always practical in terms of cost and operability.

On the other hand, in recent years, microbial organochlorine compounds such as TCE, which are stable in the environment, have been reported to be decomposed by microorganisms in recent years, and studies for their practical use have begun. That is, in the biodegradation treatment using microorganisms, it is possible to decompose organic chlorine compounds into harmless substances by appropriately selecting the microorganisms to be used, basically no special chemicals are required, and labor and cost required for maintenance. There are advantages such as reduction.

Under such circumstances, decomposition of volatile organic chlorine compounds such as TCE by microorganisms has been reported in recent years, and studies for their practical use have begun.
Such a technique is called bioremediation,
By selecting the microorganisms to be used, organic chlorine compounds can be decomposed into harmless substances, basically no special chemicals are required, maintenance labor and cost can be reduced, and even if it is low concentration, it can be completely decomposed and removed. There are advantages.

[0007] As the development toward the practical use of such bioremediation progresses, there is a strong demand for a microorganism which is the core of this technique and which exerts a strong volatile organic chlorine compound decomposing ability in soil.

The vacuum extraction method is the most common method for removing such volatile organic chlorine compounds in soil pollution. This method creates an extraction well in the contaminated soil,
The volatile organic chlorine compound is sucked and removed by sucking with a vacuum pump. However, the volatile organic chlorine compound sucked in this way is not decomposed and remains in the gas phase as it is. That is, it can be said that the polluted substance is simply transferred from the soil to the gas phase, and the treatment of the volatile organic chlorine compound after such treatment has become a big problem. This is also a problem of air pollution. Air pollution means the pollution generated in the above-mentioned high-tech factory, etc., and in this case as well, it cannot be released into the atmosphere / environment without the treatment of volatile organic chlorine compounds in the gas phase.

At present, liquefaction treatment, adsorption on activated carbon and the like are known as means for removing volatile organic chlorine compounds existing in the gas phase. However, when activated carbon is used, its regeneration is a problem, and in the liquefaction process, although a large-scale device is required, the pollution concentration in the gas phase is low, so the efficiency is very poor, resulting in high cost. Inviting is a problem. Furthermore, these methods are merely means for removing volatile organochlorine compounds and do not involve decomposition of the compounds, and thus cannot be said to be essential solutions. As described above, there is a strong demand for a purification means that is excellent in cost efficiency and operability for the purification of gas phase pollution and that decomposes and detoxifies volatile organic chlorine compounds.

Of such bioremediation,
For example, with the progress of development toward practical use as a bioreactor for gas phase pollution, a microorganism that exerts a strong volatile organic chlorine compound decomposing ability in soil, which is the core of this technology, is strongly desired.

Most of the bacteria for which the treatment method of volatile organic chlorine compounds in the gas phase is currently studied by the bioreactor system are methane-utilizing bacteria, and require methane or methanol for the decomposition of volatile organic chlorine compounds. From the viewpoint of performing gas phase treatment, it cannot be said that the range of currently known bacterial species is practically sufficient, and it is necessary to acquire new bacterial species.

[0012] However, there are few reports of isolation by microorganisms capable of decomposing volatile organic chlorine compounds. For example, TC
E-degrading bacteria include Welchia alkenophila sero 5 (USP
4877736, ATCC 53570), Welchia alkenophila sero 33
(USP 4877736, ATCC 53571), Methylocystis sp. Strai
n M (Agric. Biol. Chem., 53,2903 (1989), Biosci. B
iotech.Biochem., 56,486 (1992), 56,736 (1992))
, Methylosinus trichosporium OB3b (Am. Chem. Soc.
Natl. Meet. Dev. Environ. Microbiol., 29,365 (198
9), Appl. Environ. Microbiol., 55,3155 (1989), App
l. Biochem. Biotechnol., 28,877 (1991), JP-A-02-92
274, JP 03-292970), Methylomonas
sp.MM2 (Appl. Environ. Microbiol., 57,236 (199
1)), Alcaligenes denitrificans ssp. Xylosoxidans J
E75 (Arch.microbiol., 154,410 (1990)), Alcaligenes
eutrophus JMP134 (Appl. Environ. Microbiol., 56,1
179 (1990)), Mycobacterium vaccae JOB5 (J. Gen. Mi.
crobiol., 82,163 (1974), Appl.Environ.Microbiol.,
54,2960 (1989), ATCC 29678), Pseudomonas putida B
H (Sewerage Association Magazine, 24, 27 (1987)), Acinetobactor sp. S
train G4 (Appl. Environ. Microbiol., 52,383 (198
6), 53,949 (1987), 54,951 (1989), 56,279 (199)
0), 57, 193 (1991), USP 4925802, ATCC 53617, which was initially classified as Pseudomonas cepacia.
inetobactor sp.), Pseudomonasmendoci
na KR-1 (Bio / Technol., 7,282 (1989)), Pseudomonas p
utida F1 (Appl.Environ.Microbiol., 54,1703 (1988),
54, 2578 (1988)), Pseudomonas fluorescens PFL12 (A
ppl. Environ. Microbiol., 54,2578 (1988)), Pseudomo
nas putida KWI-9 (Japanese Patent Laid-Open No. 06-70753), Pseudomo
nas cepacia KK01 (JP 06-227769 A), Pseudo
monas sp. (Japanese Patent Laid-Open No. 02-273599), Nitrosomonas
europaea (Appl. Environ. Microbiol., 56,1169 (199
0)), Lactobacillus fuctivorans RE (Int. J. Syst. B
acteriol., 30,313 (1980), J. Appl. Bacteriol., 34,5
41 (1971)), Lactobacillus vaginalis sp. Nov (Int.
There are only J. Syst. Bacteriol., 39,368 (1989), ATCC 49540), etc.

Moreover, from the viewpoint of satisfying various practical conditions and having sufficient decomposing ability when used in a method for decomposing a volatile organochlorine compound using a microorganism, it can The range is not always sufficient. Therefore, at present, there is a strong demand for the acquisition of bacterial strains that satisfy the characteristics required in practical use.

As a property required for the bacterial species used for such biological purification, it is needless to say that it has a sufficient decomposing ability for volatile organochlorine compounds, but due to the difference in growth conditions from known bacterial species, It is more preferable that the range of application can be expanded, or that the number of embodiments thereof be abundant.

For example, in the case of treating a waste liquid containing TCE, it is required that the microorganism to be applied grows even in a bad environment of the waste liquid and can maintain the degrading activity, in addition to the ability to decompose TCE.

As described above, there is a strong demand for a bacterial species having a sufficient ability to decompose volatile organic chlorine compounds and having practically advantageous characteristics over the conventionally known bacterial species.

[0017]

DISCLOSURE OF THE INVENTION The object of the present invention is to develop a powerful novel microorganism for decomposing such a volatile organochlorine compound which is a problem as a harmful chemical substance, and a volatilization utilizing the microorganism. Disclosed is a method for decomposing a volatile organochlorine compound, particularly for decomposing a volatile organochlorine compound contained in wastewater / waste liquid, an aqueous medium such as groundwater, and air.

[0018]

The above object can be achieved by the present invention described below.

That is, the inventors of the present invention searched for a bacterial species decomposing a volatile organic chlorine compound, and as a result, found that a high concentration of the volatile organic chlorine was found in the Kanto loam soil of Japan contaminated with the volatile organic chlorine compound. By acquiring a new bacterial strain having compound decomposing ability and contacting this bacterial strain with a polluted medium containing a volatile organochlorine compound, for example, an aqueous medium such as groundwater or contaminated air, the volatile organic compound in the polluted medium is contacted. We have found a method of decomposing chlorine compounds.

The strain newly obtained in the present invention is a gram-negative bacillus and exhibits the following mycological properties. B. Growth status on various agar media Standard agar: Good growth MacConkey agar: Good growth C.I. Optimum growth temperature: 25 ° C> 35 ° C D. Physiological properties Distinction between aerobic and anaerobic: aerobic TSI (slant / butt): alkali / alkaline, H ₂ S (-) catalase: positive Oxidation / fermentation te
st:-/-Potassium nitrate reducibility: positive Indole productivity from L-tryptophan: negative Glucose acidification: negative Arginine dihydrase: positive urease: positive Esculin hydrolysis (β-glucosidase): negative Gelatin hydrolysis ( Protease): Negative β-galactosidase: Negative Cytochrome oxidase: Positive E. Assimilation of sugars and organic acids Glucose: negative L-arabinose: negative D-mannose: negative D-mannitol: negative N-acetyl-D-glucosamine: positive Maltose: negative potassium gluconate: positive n-caprate: positive adipine Acid: positive dl-malic acid: positive Sodium citrate: negative Phenyl acetate: positive From the above properties, this strain is Vibrio .
It is clear that belong to the genus, from the fact that the relevant species is not found, Vibrio sp. (Vibrio s
p. ) Was deemed appropriate.

Further, as is clear from the examples described later, this strain has an excellent volatile organochlorine compound decomposing ability such that it is completely decomposed even in a high concentration of TCE of 20 ppm. Since aerobically degrade fungal volatile organic chlorine compounds such as TCE are heretofore unknown in Vibrio sp., Certifies the strain and the new strains, Vibrio sp. KB1 strain (Vibrio s
p. KB1) and deposited at the Institute of Biotechnology, Institute of Technology, Ministry of International Trade and Industry (deposit number: FERM P-14).
643). Hereinafter, this strain is referred to as KB1 strain.

The strain KB1 decomposes aromatic compounds such as phenol and cresol as well as volatile organic chlorine compounds, as shown in Examples described later, and thus naturally has resistance to these compounds. As can be seen from the fact that such compounds are usually used as bactericides, they are harmful to many microorganisms, and in many cases, they are actually mixed as wastewater or soil contaminants. Even if these compounds are mixed, it is possible to realize the decomposition treatment of the volatile organochlorine compound without suffering damage such as death and activity inhibition.

The nutrient source of the medium used for culturing the KB1 strain of the present invention is any carbon source or nitrogen source as long as it is a nutrient source required for normal microorganism growth and which can be assimilated by this bacterium. Inorganic salts may also be used, and for example, it is possible to culture with M9 medium supplemented with yeast extract as a slight nutrient source.

The composition of M9 medium is shown below.

Na ₂ HPO ₄ : 6.2 g KH ₂ PO ₄ : 3.0 g NaCl: 0.5 g NH ₄ Cl: 1.0 g (in 1 liter of medium; pH 7)
The culture can be performed under aerobic conditions, and may be liquid culture or solid culture. The culture temperature is preferably around 30 ° C.

Mutant strains obtained by mutating the bacterium naturally or by artificial means are all included in the scope of the present invention as long as they have good volatile organochlorine compound degrading activity.

The decomposition treatment of the volatile organochlorine compound in the present invention is carried out by bringing the volatile organochlorine compound in a polluting medium such as a waste liquid into contact with the KB1 strain. The contact between the microorganism and the volatile organic chlorine compound can be carried out by a method such as culturing the microorganism in a contaminated medium containing the volatile organic chlorine compound, or adding the aqueous medium to a culture system of the microorganism. , Batch method, semi-continuous method, continuous method and the like. The microorganism can be used in a semi-solid state or immobilized on an appropriate carrier. Materials to be treated such as waste liquid, soil and air,
You may perform various processing as needed. For example, TCE
The concentration, pH, supplementation of various nutritional substances and the like may be performed.
The concentration of TCE in the decomposition treatment region may be adjusted to about 10 ppm or less.

The decomposition treatment of the volatile organic chlorine compound existing in the gas phase in the present invention can be carried out by contacting polluted air with the KB1 strain. The main application forms are described below, but the present strain is not limited to these forms, and the strain can be used for purification treatment of any vapor phase contamination of volatile organochlorine compounds.

For example, a culture tank is provided to culture the KB1 strain,
There is a mode in which a gas contaminated with a volatile organic chlorine compound is introduced into this culture tank at a predetermined flow rate and decomposed. There is no limitation on the method of introducing the gas, but a form in which the culture solution is agitated by the introduction of the gas to promote aeration is more preferable. The introduction and exhaust of the gas may be performed continuously, but it is also possible to perform the treatment intermittently or in a batch manner depending on the treatment capacity. It is advisable to optimize such control by controlling the system according to the concentration of the volatile organic chlorine compound.

As another utilization form, the KB1 strain is attached to a carrier such as soil particles and the like, which is filled in a reaction tank, and a volatile organochlorine compound-contaminated gas is introduced into the reaction tank for decomposition treatment. There are forms. In this case, the carrier to be used is not limited to soil particles, and any carrier can be used, but it is more preferable that it has an excellent ability to retain microorganisms and does not impair the air permeability. For example, as a material that provides a habitat space for microorganisms, various microbial carriers that are commonly used in bioreactors conventionally used in the pharmaceutical industry, food industry, wastewater treatment system and the like can be used. More specifically, porous glass, ceramics, metal oxides, activated carbon, kaolinite, bentonite, zeolite, silica gel, alumina, inorganic particulate carriers such as anthracite, starch, agar, chitin, chitosan, polyvinyl alcohol, alginic acid. , Polyacrylamide,
Gel-like carrier such as carrageenan, agarose, gelatin,
Ion exchangeable cellulose, ion exchange resins, cellulose derivatives, glutaraldehyde, polyacrylic acid, polyurethane, polyester and the like can be mentioned. As natural products, cellulosic materials such as cotton, hemp, and paper, wood flour,
Lignin type bark such as bark can also be used.

Further, as a material for growing the present bacterium, as described above, a generally used culture medium for culturing a microorganism can be used. For example, broth medium, M9 medium, 2XYT medium, L medium, or a medium in which polypeptone, yeast extract or the like and a carbon source such as glucose are arbitrarily mixed are effective. In addition, these media can be used either in liquid form or in gel form by adding agarose.

Further, as a material capable of holding bacteria and supplying nutrients, many examples can be given to compost used in the agriculture, forestry and fisheries industries. That is, it is possible to use grain-derived straw such as straw, sawdust, rice bran, snow vegetables, dried products derived from plants such as sugar cane dregs, and marine waste such as crab and shrimp shells.

The TCE-contaminated gas may be purified by pre-filling with a substance serving as a carrier and then introducing the bacterium, or pre-culturing. In order to carry out the decomposition reaction more efficiently, it is advisable to maintain the above-mentioned nutrients, water content ratio, oxygen concentration, etc. under desired conditions. Further, the ratio of the carrier to the water content in the reaction tank may be appropriately selected depending on the growth and air permeability of the microorganisms and the form of the reaction tank depending on the amount and concentration of the gas to be treated. Care should be taken to facilitate contact with, for example columns, tubes, tanks,
A box-shaped one can be used. Furthermore, such a shape may be unitized with an exhaust duct, a filter, or the like, or some of them may be connected in accordance with the ability.

The pollutant gas may initially be adsorbed on the carrier material, and in some cases the effect of microbial utilization is not observed well. However, after a certain period of time, the pollutants adhering to the carrier material are decomposed, and Since the contaminants are adsorbed again on the surface of the material where the contaminants are decomposed, the adsorptivity to the carrier material is regenerated. In this way, the TCE removal ability is not saturated and a constant decomposition can be expected.

Except for the artificially modified bacteria, all known volatile organochlorine compounds (TCE, DCE and vinyl chloride) degrading bacteria are chemical substances called inducers because they exhibit degrading activity. The existence of is necessary. That is, the target volatile organochlorine compound can be decomposed by the enzyme expressed to decompose the inducer. The type of inducer is, for example, M
ethilosinus trichosporium
In OB3b, methane is the Pseudomonas c
In epacia KK01, certain aromatic compounds such as phenol serve as the inducer. The KB1 strain is a type of degrading bacterium that can use an aromatic compound as an inducer, and phenol, o-cresol, m-cresol, and p-cresol can be used as inducers as currently known substances. Therefore, when decomposing a volatile organochlorine compound using this bacterium, the degrading enzyme is expressed by these inducers during the decomposition. For that purpose, it may be cultured in the presence of the inducer before decomposing the volatile organochlorine compound, or may be cultured in the coexistence of the volatile organochlorine compound and the inducer. A suitable and effective concentration of such inducer is 10 to 200 ppm, more preferably 50 to 100 ppm.

Most of these inducers are converted into easily decomposable substances by this bacterium and kept in a state in which general soil-dwelling bacteria can come into contact with them, or through a commonly used waste liquid treatment tank or the like. Then, it will be completely decomposed without any problem.

The method of the present invention can be applied to waste liquid treatment, soil treatment, and air treatment methods for both closed and open systems. It should be noted that the microorganism may be immobilized on a carrier or the like, or various methods for promoting growth may be used in combination.

[0038]

EXAMPLES Example 1. Decomposition of Phenol by KB1 Strain A colony of KB1 strain on an agar medium was inoculated into 200 ml of M9 medium containing 0.2% of yeast extract in a Sakaguchi flask, and shake culture was carried out at 30 ° C. for 24 hours.

Next, phenol 400 ppm, 600 pp
50 ml of a M9 medium containing 0.1% yeast extract containing 800 ppm of m and 800 ppm was poured into a 100 ml Sakaguchi flask, and 0.1 ml of the bacterial solution cultured as described above was inoculated into each medium, followed by shaking culture at 30 ° C. The amount of phenol was quantified by a spectrophotometer, and the decrease of phenol was measured over time. The results are shown in Fig. 1.

400 ppm, 600 ppm, 800 pp
m phenol is 15 hours, 20 hours, 30 hours
It was completely decomposed by the time.

Example 2. Degradation of Cresol by KB1 Strain Except that phenol in the medium was 100 ppm each of o-cresol, m-cresol and p-cresol,
In the same manner as in Example 1, an attempt was made to decompose cresol by the KB1 strain. The results are shown in Figure 2.

By the 40th hour, o-cresol was added to m-
Cresol has 20 p-cresol by the 24th hour
It was completely decomposed by time.

Example 3. Degradation of TCE by KB1 strain (10 ppm, inducer: phenol 200 ppm) Colonies of KB1 strain on an agar medium were inoculated into 200 ml of M9 medium containing 0.2% of yeast extract in a Sakaguchi flask and shaken at 30 ° C. for 24 hours. Culture was performed.

Next, TCE 10 ppm and phenol 20
5 ml of M9 medium containing 0.1% yeast extract containing 0 ppm
Was injected into a vial and cultured as described above.
After inoculating 1 ml, it was completely sealed with a butyl rubber stopper and an aluminum cap, and cultured with shaking at 30 ° C. The amount of TCE was quantified by gas chromatography by the headspace method, and the decrease in TCE was measured over time. The results are shown in Fig. 3.

TCE was significantly decomposed in the first 23 hours, and by 40 hours, 10 ppm of TCE was completely decomposed. Moreover, when phenol was quantified by a spectrophotometer at this point, it was completely decomposed.

Example 4. Degradation of TCE by KB1 strain (20 ppm, inducer: phenol 400 ppm) TCE concentration in the medium was 20 ppm and phenol concentration was 4
The decrease in TCE was measured over time by the same method as in Example 3 except that the amount was set to 00 ppm. FIG. 4 shows the results. TCE was significantly decomposed after an induction period of about 18 hours, and the decomposition proceeded thereafter, and by 47 hours, 20 ppm of TCE was completely decomposed. Moreover, when phenol was quantified by a spectrophotometer at this point, it was completely decomposed.

Example 5. Degradation of TCE by KB1 strain (inducer: m-cresol / p-cresol 100p
pm) The decrease of TCE was measured over time by the same method as in Example 3 except that the TCE concentration in each medium was 5 ppm and the inducers were m-cresol and p-cresol 100 ppm. Results are shown in FIG.

In the p-cresol-added system, remarkable decomposition occurred in the first 12 hours, and 5 ppm by 18 hours.
TCE was completely degraded. Moreover, when p-cresol at this point was quantified by a spectrophotometer, it was completely decomposed.

In addition, in the m-cresol-added system, remarkable TCE decomposition started after an induction period of about 18 hours,
By 36 hours, 5 ppm of TCE had been completely decomposed. Then, at this point, m-cresol was completely decomposed even when an attempt was made to quantify it with a spectrophotometer.

Example 6. Decomposition of DCE by KB1 strain (inducer: phenol 200 ppm) The substances to be decomposed in the medium were cis-1,2-dichloroethylene (cis-1,2-DCE) and trans-1,
2-dichloroethylene (trans-1,2-DCE)
The decrease in DCE was measured over time by the same method as in Example 3 except that the concentration was changed to 10 ppm. FIG. 6 shows the results.

Sequential decomposition of cis-1,2-DCE occurred, and it was completely decomposed by 36 hours. trans-
1,2-DCE started to be significantly decomposed after about 12 hours and was completely decomposed by 48 hours. Moreover, when phenol was quantified by a spectrophotometer at this point, it was completely decomposed.

Example 7. Degradation treatment of phenol in soil with KB1 strain (brown forest soil) Colonies of KB1 strain on agar medium were inoculated into 200 ml of M9 medium containing 0.2% of yeast extract in a Sakaguchi flask, and shake-cultured at 30 ° C for 36 hours. I went.

Next, phenol 200 ppm, 400 pp
0.1 ml of M9 medium containing 0.1% yeast extract containing m and 600 ppm was poured into each vial, 4 g of brown forest soil was added, and 0.1 ml of the bacterial solution cultured as above.
Was inoculated, then a cotton plug was attached, and static culture was performed at 30 ° C. The amount of phenol is detected by the JIS method using aminoantipyrine (JIS K 0102-1993, 28.1).
The decrease in TCE was measured over time. FIG. 7 shows the results.

200 ppm phenol by the 24th hour, 400 ppm phenol by the 30th hour, 60
The 0 ppm phenol was completely decomposed by the 36th hour.

Example 8. Degradation treatment of cresol in soil with KB1 strain (brown forest soil) Example 7 except that the decomposition target substances in the medium were 100 ppm of o-cresol, m-cresol and p-cresol
An attempt was made to decompose cresol by the KB1 strain in the same manner as in. The amount of cresol was detected by the JIS method using p-hydrazidebenzenesulfonic acid (JIS K 010).
2-1993, 28.2), and the decrease in cresol was measured over time. The results are shown in Fig. 8.

By the 48th hour, o-cresol was added to m-
Cresol is 40 hours and p-cresol is 20
It was completely decomposed by time.

Example 9. TCE in soil by KB1 strain
Degradation treatment (brown forest soil) Colonies of KB1 strain on an agar medium were inoculated into 200 ml of M9 medium containing 0.2% of yeast extract in a Sakaguchi flask, and shake culture was performed at 30 ° C. for 36 hours.

Next, TCE 10 ppm and phenol 20
1 ml of M9 medium containing 0.1% yeast extract containing 0 ppm
Was poured into a vial, 4 g of brown forest soil was added, and 0.1 ml of the bacterial solution cultured as described above was further inoculated, then completely sealed with a butyl rubber stopper and an aluminum cap, and statically cultured at 30 ° C. The amount of TCE was quantified by gas chromatography by the headspace method, and the decrease in TCE was measured over time. The results are shown in Fig. 9.

After an induction period of about 18 hours, a marked TC
Decomposition of E started and by 36 hours, 10 ppm T
CE was completely degraded. Phenol at this point was not detected by the detection method (JIS K 0102-1993, 28.1) according to the JIS method using aminoantipyrine.

Example 10. TC in soil by KB1 strain
Decomposition treatment of E (loam soil) The decrease of TCE was measured with time by the same method as in Example 9 except that the soil sample was loam soil. The results are shown in Fig. 10.

After an induction period of about 24 hours, a significant TC
Decomposition of E started and by 36 hours, 10 ppm T
CE was completely degraded. Phenol at this point was not detected by the detection method (JIS K 0102-1993, 28.1) according to the JIS method using aminoantipyrine.

Example 11. TC in soil by KB1 strain
Decomposition treatment of E (fine sand soil) The decrease of TCE was measured over time by the same method as in Example 9 except that the soil sample was fine sand soil (silt content: about 10%). The results are shown in Fig. 11.

After an induction period of about 18 hours, a significant TC
Decomposition of E started and after 24 hours, T of 10 ppm
CE was completely degraded. Phenol at this point was not detected by the detection method (JIS K 0102-1993, 28.1) according to the JIS method using aminoantipyrine.

Example 12 TC in soil by KB1 strain
Decomposition of E (inducer: p-cresol / m-cresol 100 ppm) TCE concentration is 5 ppm, and inducer in the medium is p
-The decrease of TCE was measured with time by the same method as in Example 9 except that 100 ppm of -cresol and m-cresol were used. Results are shown in FIG.

In the m-cresol-added system, remarkable TCE decomposition started after an induction period of about 24 hours, and 5 ppm of TCE was completely separated by 48 hours. Also p-
In the cresol-added system, remarkable decomposition proceeded in the first 12 hours, and by 18 hours, 5 ppm of TCE was completely decomposed. Further, p-cresol and m-cresol at this time are detected by the JIS method using p-hydrazidebenzenesulfonic acid (JIS K 0102-199).
3, 28.2), it was not detected.

Example 13. DC in soil by KB1 strain
Decomposition of E The substances to be decomposed in the medium were cis-1,2-dichloroethylene (cis-1,2-DCE) and trans-1,
2-dichloroethylene (trans-1,2-DCE)
The decrease in DCE was measured with time in the same manner as in Example 9 except that the amount was 5 ppm. The results are shown in Fig. 13.

After the induction period of about 12 hours for cis-1,2-DCE, and for the induction period of about 18 hours for trans-1,2-DCE, remarkable decomposition started and cis-
1,2-DCE is trans-1,
2-DCE was completely decomposed by 36 hours. Phenol at this point was detected by the JIS method using aminoantipyrine (JIS K 0102-19).
93, 28.1), it was not detected.

Example 14 Decomposition and purification treatment of TCE in the gas phase by aeration of culture medium with KB1 strain (inducer: phenol 200 ppm) Colonies of KB1 strain on agar medium were inoculated into 200 ml of M9 medium containing 0.2% yeast extract in a Sakaguchi flask. Shaking culture was performed at 30 ° C. for 36 hours.

0.1 ml of this culture solution was added to 200 ppm
Vial (20m
1 volume) of M9 medium (containing 0.1% yeast extract). Air aerated in a saturated aqueous solution of TCE was introduced into this solution at a flow rate of 60 ml / min for 10 minutes, then completely sealed with a butyl rubber stopper and an aluminum cap, and cultured with shaking at 30 ° C. The amount of TCE was quantified by gas chromatography by the headspace method, and the decrease in TCE was measured over time.

As a control, TCE was also quantified in a system in which only a sterilized medium was added instead of the bacterial solution in the same experimental system, and the residual rate relative to the TCE amount of the control was determined. The results are shown in Fig. 14.

After the induction period of about 12 hours, sequential TCE
Was decomposed, and TCE was completely decomposed by 36 hours. Phenol at this point was detected by the JIS method using aminoantipyrine (JIS K
010-1993, 28.1).

Example 15. Decomposition and purification treatment of TCE in the gas phase by aeration of culture medium with KB1 strain (inducer: p-cresol 200 ppm) TCE was sequentially performed in the same manner as in Example 14 except that the inducer in the medium was p-cresol 200 ppm. Was measured. The results are shown in Fig. 15.

After the induction period of about 18 hours, sequential TCE
Was decomposed, and TCE was completely decomposed by 42 hours. Further, p-cresol at this time is detected by the JIS method using p-hydrazidebenzenesulfonic acid (JIS K 0102-1993, 28.2).
, It was not detected.

Example 16 Decomposition and purification treatment of DCE in the gas phase by aeration of the culture medium with the KB1 strain. The substances to be decomposed in the gas phase were cis-1,2-dichloroethylene (cis-1,2-DCE) and trans-1,
2-dichloroethylene (trans-1,2-DCE)
The decrease in DCE was measured with the same method as in Example 14 except that. The results are shown in Fig. 16.

After the induction period of about 12 hours for cis-1,2-DCE, and for the induction period of about 18 hours for trans-1,2-DCE, sequential decomposition was started, and cis-1,
2-DCE was trans-1,2- by 36 hours later.
DCE was completely degraded by 48 hours. Also, at this point, the phenol used was aminoantipyrine.
Detection method by IS method (JIS K 0102-199
3,28.1), it was not detected.

Example 17 Decomposition and purification treatment of gas phase TCE by aeration of KB1 strain 0.1 ml of the bacterial solution prepared in the same manner as in Example 14
5 ml of M9 medium (containing 0.1% of yeast extract) in a vial (20 ml volume) containing 00 ppm of phenol as an inducer was added, and further sterilized brown forest soil was added to the water surface. After a butyl rubber stopper was placed and the mixture was allowed to stand at 30 ° C. overnight, excess culture solution was removed by decantation.
Air aerated in a saturated aqueous solution of TCE was introduced into this soil for 10 minutes at a flow rate of 60 ml / min, then completely sealed with a butyl rubber stopper and an aluminum cap, and statically cultured at 30 ° C.
The amount of TCE was quantified by gas chromatography by the headspace method, and the decrease in TCE was measured over time.

As a control, TCE was also quantified in a system in which only a sterilized medium was added instead of the bacterial solution in the same experimental system, and the residual ratio to the TCE amount of the control was obtained. Results are shown in FIG.

After the induction period of about 12 hours, successive TCE
Was decomposed, and TCE was completely decomposed by 42 hours. Phenol at this point was detected by the JIS method using aminoantipyrine (JIS K
010-1993, 28.1).

Example 18. Decomposition and purification treatment of TCE in the gas phase by continuous aeration of culture medium with KB1 strain 0.1 ml of the bacterial solution prepared in the same manner as in Example 14
It was added to 5 ml of M9 medium (containing 0.1% of yeast extract) in a vial (20 ml volume) containing 00 ppm of phenol as an inducer, completely sealed with a butyl rubber stopper and an aluminum cap, and then aerated in a saturated aqueous solution of TCE. Static culture was carried out at 30 ° C. while continuously flowing air into the solution at a flow rate of 0.5 ml / min. The amount of TCE is determined by quantifying TCE in the air flowing out by gas chromatography,
The decrease in TCE was measured over time. As a control, TCE was also quantified in a system in which only a sterilized medium was added instead of the bacterial solution in the same experimental system, and the residual rate relative to the TCE amount of the control was determined. The results are shown in Fig. 18.

After the induction period of about 12 hours, TC
Degradation of E began and TCE continued to be degraded up to about 24. Phenol at this point is detected by the JIS method using aminoantipyrine (JIS K 010
2-1993, 28.1), it was not detected.

Example 19 Decomposition and purification treatment of TCE in the gas phase by continuous aeration of soil with KB1 strain 0.1 ml of the bacterial solution prepared in the same manner as in Example 14
5 ml of M9 medium (containing 0.1% of yeast extract) in a vial (20 ml volume) containing 00 ppm of phenol as an inducer was added, and further sterilized brown forest soil was added to the water surface. After a butyl rubber stopper was placed and the mixture was allowed to stand at 30 ° C. overnight, excess culture solution was removed by decantation.
After completely sealing with butyl rubber stopper and aluminum cap,
Static culture was carried out at 30 ° C. while continuously flowing air aerated in CE saturated aqueous solution at a flow rate of 0.5 ml / min. The amount of TCE was determined by quantifying TCE in the air flowing out by gas chromatography and measuring the decrease in TCE over time.

As a control, TCE was quantified in a system in which only a sterilized medium was added instead of the bacterial solution in the same experimental system, and the residual ratio to the TCE amount of the control was obtained. The results are shown in Fig. 19.

After the induction period of about 15 hours, TC
Degradation of E began and TCE continued to be degraded until about 27 hours. Phenol at this point is detected by the JIS method using aminoantipyrine (JIS K 01
02-1993, 28.1).

[0084]

INDUSTRIAL APPLICABILITY The novel TC provided by the present invention
E-degrading bacterium Vibrio sp. KB1 enables efficient biodegradation and purification of pollutant media such as groundwater and polluted air by volatile organic chlorine compounds.

[Brief description of drawings]

FIG. 1 shows the degradation of phenol by KB1 strain.

FIG. 2 is a diagram showing cresol degradation by the KB1 strain.

FIG. 3 TC in phenol-added system by KB1 strain
Diagram showing E decomposition

FIG. 4 TC in phenol-added system by KB1 strain
Diagram showing E decomposition

FIG. 5: TC in the cresol addition system by KB1 strain
Diagram showing E decomposition

FIG. 6 DC in phenol-added system by KB1 strain
Diagram showing E decomposition

FIG. 7 is a diagram showing decomposition treatment of phenol in soil by KB1 strain.

FIG. 8 is a diagram showing decomposition treatment of cresol in soil by KB1 strain.

FIG. 9 is a diagram showing decomposition treatment of TCE in soil by KB1 strain.

FIG. 10 is a diagram showing decomposition treatment of TCE in soil by KB1 strain.

FIG. 11 is a diagram showing decomposition treatment of TCE in soil by KB1 strain.

FIG. 12: TCE with cresol in soil by KB1 strain
Figure showing the decomposition process of

FIG. 13 is a view showing decomposition treatment of DCE in soil by KB1 strain.

FIG. 14 is a diagram showing a decomposition treatment of TCE by aeration with KB1 strain.

FIG. 15 is a diagram showing TCE decomposition treatment by aeration with KB1 strain.

FIG. 16 is a view showing a DCE decomposition treatment by aeration with KB1 strain.

FIG. 17 is a diagram showing decomposition treatment of TCE by aeration with KB1 strain.

FIG. 18 is a diagram showing TCE degradation treatment by aeration with KB1 strain.

FIG. 19 is a diagram showing decomposition treatment of TCE by aeration with KB1 strain.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication C02F 3/02 A 3/34 ZAB Z // (C12N 1/20 C12R 1:63)

Claims (17)

[Claims] 1. A novel microorganism Vibrio species KB1
( Vibrio sp. KB1 ,: FERM P-14
643). 2. A biological purification method for a polluted medium, which comprises bringing Vibrio species KB1 into contact with a medium polluted with an aromatic compound or a volatile organic chlorine compound. 3. The method according to claim 2, wherein the medium is soil. 4. The method according to claim 2, wherein the medium is soil and the polluting medium is groundwater. 5. The method according to claim 4, wherein the aromatic compound is at least one of phenol, o-cresol, m-cresol and p-cresol. 6. The method according to claim 4, wherein the volatile organic chlorine compound is at least one of trichloroethylene and dichloroethylene. 7. The method according to claim 6, wherein Vibrio species KB1 has a volatile organochlorine compound-degrading activity induced by an inducer. 8. The inducer is any one of phenol, o-cresol, m-cresol and p-cresol.
The method according to claim 7, which is the above. 9. The method according to claim 2, wherein the medium is water and the contaminated medium is an aqueous medium. 10. Method according to claim 2, characterized in that the medium is air and the contaminated medium is therefore also air. 11. The method according to claim 10, wherein the contacting comprises introducing air containing an aromatic compound or a volatile organic chlorine compound into a liquid phase containing Vibrio species KB1. 12. The contacting is carried out by bringing air containing an aromatic compound or a volatile organic chlorine compound into contact with a carrier supporting Vibrio species KB1.
The method described in 0. 13. A contact is made by accommodating a carrier carrying Vibrio species KB1 in a container, and introducing air containing an aromatic compound or a volatile organic chlorine compound from one of the containers and discharging it from the other. The biological purification method for polluted air according to claim 10. 14. The method according to claim 13, wherein the aromatic compound is at least one of phenol, o-cresol, m-cresol and p-cresol. 15. The method according to claim 13, wherein the volatile organic chlorine compound is at least one of trichlorethylene and dichloroethylene. 16. The method according to claim 15, wherein Vibrio species KB1 has a volatile organochlorine compound-degrading activity induced by an inducer. 17. The inducer is any one of phenol, o-cresol, m-cresol and p-cresol.
17. The method according to claim 16, which is the above.