JP2000225336A - Method for decomposing halogenated aliphatic hydrocarbon compound or aromatic compound, method for purifying medium contaminated halogenated aliphatic hydrocarbon compound and/or aromatic compound, and apparatuses for the methods - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent environmental pollution caused by the decomposition of compounds by making halogenated aromatic hydrocarbon compounds and others be contacted with functional water produced by electrolyzing water containing an electrolyte while being irradiated with light and neutralizing the obtained liquid. SOLUTION: Water containing electrolyte is supplied from a pipe 111 to a water tank 101. Electric power is supplied from a power source to electrodes 103, 105, and acidic water is produced on the side of the electrode 105. Halogenated aliphatic hydrocarbon compounds and aromatic compounds are supplied from a pipe 115 to the anode 105 side, irradiated with light from a light source 166 installed inside or outside the tank 101, and contacted with functional water to promote the decomposition by light irradiation. Decomposed gas is discharged from a discharge pipe 121. After that, the deactivated functional water is discharged form a discharge pipe 181 to a tank 119. In this process, the pH of the mixed aqueous solution is adjusted by a pH adjusting means 167.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for decomposing a halogenated aliphatic hydrocarbon compound or an aromatic compound, a method for purifying a medium contaminated by at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound, and a method for purifying the same. It relates to the device used.

[0002]

2. Description of the Related Art With the development of industrial technology up to recent years, various organic compounds such as aromatic compounds and halogenated aliphatic hydrocarbons have been used enormously, and disposal thereof has become a serious problem. In addition, various kinds of used halogenated aliphatic hydrocarbons and aromatic compounds cause environmental problems such as polluting the natural environment, and great efforts have been made to solve them.

[0003] For example, as an example of a method for decomposing chlorinated aliphatic hydrocarbon compounds, there is a method of burning activated carbon or the like to which chlorinated aliphatic hydrocarbons are adsorbed.

As an example of a method for decomposing a chlorinated aliphatic hydrocarbon compound, a method using an oxidizing agent or a catalyst can be mentioned. Specifically, for example, a method for decomposing with ozone (JP-A-3-38297)
Japanese Patent Application Laid-Open No. 60-261 discloses a method of performing wet oxidative decomposition under high temperature and high pressure and a method of performing oxidative decomposition with hydrogen peroxide or iron salt.
No. 59) is known.

A method using sodium hypochlorite as an oxidizing agent has also been proposed (US Pat. No. 5,561,164).
No. 2). A method of combining sodium hypochlorite with ultraviolet irradiation has also been proposed (US Pat. No. 5,558,272).
No. 41).

[0006] A method is also known in which a photocatalyst comprising fine particles of an oxide semiconductor such as titanium oxide and a liquid chlorinated aliphatic hydrocarbon are suspended under alkaline conditions and decomposed by light irradiation (Japanese Patent Application Laid-Open No. 7-141373). ).

Further, as a method for decomposing chlorinated aliphatic hydrocarbon compounds, a photodecomposition method of irradiating ultraviolet rays in a gas phase without using an oxidizing agent has already been tried (see Sekihiro, et al .: "Current situation of groundwater and soil pollution and Countermeasures, edited by the Japan Society on Water Environment, Kansai Chapter, Environmental Technology Research Association, 1995; Japanese Patent Application Laid-Open No. 8-243351).

[0008] It is known that chlorinated aliphatic hydrocarbons such as trichlorethylene (TCE) and tetrachloroethylene (PCE) are decomposed aerobically or anaerobically by microorganisms. Attempts have been made to purify.

Japanese Patent Application Laid-Open No. 8-141367 discloses a decomposition method in which a fuel such as alcohol or ether is mixed with Freon gas and burned in the presence of a catalyst.

US Pat. No. 5,393,394 discloses a method of decomposing fluorocarbon gas directly or by dissolving it in a solvent and irradiating it with ultraviolet rays.

Japanese Patent Application Laid-Open No. 3-075077 describes a method in which chlorofluorocarbon is brought into contact with an electrode of an electrolytic cell to reductively decompose it.

In order to decompose another organic compound, for example, a hardly decomposable aromatic compound, specifically, a compound having a biphenyl bond or a biphenyl skeleton (for example, polychlorinated biphenyl), (1) combustion, (2) (3) Decomposition by irradiation with ultraviolet light or radiation, (3) Microbial decomposition method, and the like have been proposed. However, only the method (1) is implemented in Japan.

There is disclosed a method of decomposing a biphenyl compound directly or by dissolving it in a solvent and irradiating it with ultraviolet rays. For example, a method of dissolving polychlorinated biphenyl in an alkaline alcohol, removing oxygen from the solution, and irradiating the solution with ionizing radiation or ultraviolet light to convert the polychlorinated biphenyl into a harmless substance is disclosed, for example, in Japanese Patent Publication No. 52-47459. Is disclosed.

Other techniques for detoxifying PCBs with ultraviolet rays are disclosed in, for example, Japanese Patent No. 199505, Japanese Patent Publication No. 49-45027, and Japanese Patent Publication No. 57-166175. A method for removing polychlorinated biphenyl and the like by utilizing the photocatalytic function of a titanium oxide catalyst is disclosed in, for example, JP-A-7-000819.

In Japanese Patent Application Laid-Open No. 8-000759,
A polychlorinated biphenyl photolysis apparatus and method are described.

A method for decomposing a compound having a biphenyl skeleton by a microorganism is described in, for example, JP-A-8-22.
No. 9385.

[0017]

The inventors of the present invention have studied various methods for decomposing halogenated aliphatic hydrocarbon compounds and aromatic compounds as described above, and as a result, all of them have problems. It was concluded that a technique for decomposition of halogenated aliphatic hydrocarbons and aromatic compounds, which had less problems and was environmentally friendly, was necessary because of the expected inclusion. Investigation was carried out for the purpose of achieving the above-mentioned problems.
No. 0293) and functional water obtained by electrolysis of water, which is reported to have a cleaning effect of contaminants on a semiconductor wafer (JP-A-7-51675), for example, acidic functional water, It has been newly found that they have excellent resolution of halogenated aliphatic hydrocarbon compounds and aromatic compounds.

The present invention has been made based on such new findings by the present inventors, and its object is to be more environmentally friendly and to reduce the possibility of causing new environmental pollution by decomposition. It is an object of the present invention to provide a method for efficiently decomposing a fluorinated aliphatic hydrocarbon compound or an aromatic compound and an apparatus used for the method.

Another object of the present invention is to provide a method for purifying a medium contaminated with a halogenated aliphatic hydrocarbon compound or aromatic compound more efficiently, and an apparatus used for the method.

[0020]

One embodiment of the method for decomposing a halogenated aliphatic hydrocarbon compound or aromatic compound according to the present invention comprises (i) functional water produced by electrolysis of water containing an electrolyte and halogen. A step of bringing a fluorinated aliphatic hydrocarbon compound or an aromatic compound into contact with light, and (ii) a step of neutralizing the liquid obtained in the step (i).

In another embodiment of the method for decomposing a halogenated aliphatic hydrocarbon compound or aromatic compound according to the present invention, there are provided (i) functional water containing hypochlorous acid and a halogenated aliphatic hydrocarbon compound or an aromatic compound. Contacting the compound with a group III compound under light irradiation; and (ii) neutralizing the liquid obtained in step (i).

In another embodiment of the method for decomposing a halogenated aliphatic hydrocarbon compound or aromatic compound according to the present invention, (i) functional water produced by electrolysis of water containing an electrolyte and halogenated aliphatic hydrocarbon are used. Contacting a hydrogen compound or an aromatic compound with light under light irradiation; and (ii) contacting the liquid obtained in the step (i) with a microorganism having the resolution of the compound contained in the liquid. It is characterized by the following.

In another embodiment of the method for decomposing a halogenated aliphatic hydrocarbon compound or aromatic compound according to the present invention, there are provided (i) functional water produced by electrolysis of water containing hypochlorous acid and halogenated water. Contacting an aliphatic hydrocarbon compound or an aromatic compound under light irradiation; and (ii)
Contacting the liquid obtained in the step (i) with a microorganism having a resolution of a compound contained in the liquid.

Further, one embodiment of the method for purifying a medium contaminated with a halogenated aliphatic hydrocarbon compound or aromatic compound according to the present invention comprises (i) functional water and halogen produced by electrolysis of water containing an electrolyte. Contacting a medium contaminated with at least one of a fluorinated aliphatic hydrocarbon compound and an aromatic compound under light irradiation; and (ii) neutralizing the liquid obtained in the step (i). It is characterized by.

Another embodiment of the method for purifying a medium contaminated with a halogenated aliphatic hydrocarbon compound or aromatic compound according to the present invention is (i) produced by electrolysis of water containing hypochlorous acid. Contacting the functional water with a medium contaminated with at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound under light irradiation; and
i) a step of neutralizing the liquid obtained in the step (i).

One embodiment of the apparatus for decomposing at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound according to the present invention comprises two regions communicating with each other via a diaphragm, and a pair disposed in each region. Electrode, and an electrolytic cell provided with a power supply for applying a potential between the pair of electrodes, means for supplying water in which an electrolyte is dissolved to the electrolytic cell, and irradiating light to at least an anode-side region of the electrolytic cell. Means for supplying at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound to be decomposed into the anode-side region of the electrolytic cell, at least one of the halogenated aliphatic hydrocarbon compound and the aromatic compound. The apparatus further comprises means for mixing the liquid flowing down from the region on the anode side of the electrolytic cell with the liquid flowing down from the cathode side of the electrolytic cell. And wherein the door.

One embodiment of the apparatus for decomposing at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound according to the present invention is an apparatus for decomposing at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound. Supplying a functional water generated on the anode side by electrolysis of electrolyte-dissolved water, which is performed by disposing a cathode and an anode in each of two regions communicating with each other via a decomposition treatment tank and a diaphragm. Means, a means for supplying a halogenated aliphatic hydrocarbon compound or an aromatic compound to be decomposed to the decomposition treatment tank, and a means for irradiating the decomposition treatment tank with light, and drainage from the decomposition treatment tank It is characterized by having means for mixing alkaline water generated on the cathode side by electrolysis of water in which the electrolyte is dissolved.

One embodiment of the apparatus for decomposing at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound according to the present invention is a decomposition apparatus for decomposing at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound. An apparatus, comprising: a decomposition treatment tank containing functional water containing hypochlorous acid; a means for supplying a halogenated aliphatic hydrocarbon compound or an aromatic compound to be decomposed to the decomposition treatment tank; And a means for mixing the wastewater from the decomposition treatment tank with the alkaline aqueous solution.

One embodiment of the apparatus for decomposing at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound according to the present invention comprises two regions communicating with each other via a diaphragm, and a pair disposed in each region. Electrode, and an electrolytic cell provided with a power supply for applying a potential between the pair of electrodes, means for supplying water in which an electrolyte is dissolved to the electrolytic cell, and irradiating light to at least an anode-side region of the electrolytic cell. Means for supplying at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound to be decomposed into the anode-side region of the electrolytic cell, at least one of the halogenated aliphatic hydrocarbon compound and the aromatic compound. The decomposition device of the above, further comprising means for contacting the liquid flowing down from the anode-side region of the electrolytic cell with a microorganism having the resolution of halo acid And it features.

One embodiment of the apparatus for decomposing at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound according to the present invention is an apparatus for decomposing at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound. Supplying a functional water generated on the anode side by electrolysis of electrolyte-dissolved water, which is performed by disposing a cathode and an anode in each of two regions communicating with each other via a decomposition treatment tank and a diaphragm. Means for supplying a halogenated aliphatic hydrocarbon compound or an aromatic compound to be decomposed to the decomposition treatment tank, and means for irradiating the decomposition treatment tank with light, and draining water from the decomposition treatment tank. It is characterized by having means for contacting with a microorganism having the ability to degrade halo acids.

One embodiment of the apparatus for decomposing at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound according to the present invention is a decomposition apparatus for decomposing at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound. An apparatus, comprising: a decomposition treatment tank containing functional water containing hypochlorous acid; a means for supplying a halogenated aliphatic hydrocarbon compound or an aromatic compound to be decomposed to the decomposition treatment tank; And a means for bringing the wastewater from the decomposition treatment tank into contact with microorganisms having the ability to degrade halo acids.

According to the embodiment of the present invention as described above, halogenated aliphatic hydrocarbon compounds and aromatic compounds can be decomposed while further reducing the influence on the environment.

According to the embodiment of the present invention,
Purification of a medium contaminated with a halogenated aliphatic hydrocarbon compound or aromatic compound can be performed while reducing the effect on the environment.

Further, according to the embodiment of the present invention,
The decomposition of the halogenated aliphatic hydrocarbon compound or aromatic compound can be performed more safely and efficiently.

[0035]

DETAILED DESCRIPTION OF THE INVENTION (Decomposition Method) One embodiment of the method for decomposing a halogenated aliphatic hydrocarbon compound or aromatic compound according to the present invention comprises (i) functional water produced by electrolysis of water containing an electrolyte. Contacting a halogenated aliphatic hydrocarbon compound or an aromatic compound under light irradiation; and (ii)
Neutralizing the liquid obtained in the step (i). Further, another embodiment of the method for decomposing a halogenated aliphatic hydrocarbon compound or an aromatic compound according to the present invention comprises (i) functional water containing hypochlorous acid and a halogenated aliphatic hydrocarbon compound or an aromatic compound. Contacting under light irradiation;
And (ii) neutralizing the liquid obtained in the step (i).

(Regarding electrolyzed functional water) Here, functional water generated by electrolysis of water containing an electrolyte means, for example, an electrolyte (for example, sodium chloride or potassium chloride) dissolved in raw water, and this water is mixed with a pair of water. When the electrolysis is performed in a water tank having an electrode, the hydrogen ion concentration (pH value) which can be obtained near the anode is 1 or more and 4 or less, the working electrode is a platinum electrode, and the reference electrode is silver-silver chloride. An oxidation-reduction potential of 800 mV to 1500 mV, preferably 1000 mV to 1300 mV, and a chlorine concentration of 5
Water having a property of not less than mg / L and not more than 150 mg / L, preferably not less than 30 mg / L and not more than 120 mg / L.

When producing functional water having the above-mentioned characteristics, the concentration of the electrolyte in the raw water before the electrolysis is preferably, for example, 20 mg / L to 2000 mg / L for sodium chloride, and the electrolytic current value at that time is 2 A It is desirable to set it to 20A. As a means for obtaining such functional water, a commercially available strongly acidic electrolyzed water generator (for example, trade name: Oasis Bio Half; manufactured by Asahi Glass Engineering Co., Ltd., trade name: strong electrolyzed water generator (Model
FW-200; manufactured by Amano Co., Ltd.).

When a diaphragm is arranged between the pair of electrodes at this time, mixing of acidic functional water generated near the anode and alkaline water generated near the cathode can be prevented, and the halogenated aliphatic water can be prevented. It is possible to obtain an acidic functional water that can more efficiently decompose a hydrocarbon compound or an aromatic compound. As the diaphragm, for example, an ion exchange membrane is preferably used.

(Synthetic functional water) Functional water containing hypochlorous acid is used as a functional water having a resolution of halogenated aliphatic hydrocarbon compound or aromatic compound almost equivalent to the functional water generated by the above-mentioned electrolysis. Can also be used. Specifically, for example, water with hydrochloric acid 0.001 N to 0.1 N, sodium chloride 0.005 N to 0.02 N, and sodium hypochlorite 0.0001 M to 0.1 M is the functional water containing hypochlorous acid in the present invention, It can be applied to the decomposition of halogenated aliphatic hydrocarbon compounds and aromatic compounds.

Functional water having a pH of 4.0 or less and a chlorine concentration of 2 mg / L or more can be prepared with hydrochloric acid and hypochlorite. Other inorganic or organic acids can be used in place of the above hydrochloric acid. Examples of the inorganic acid include hydrofluoric acid, sulfuric acid, phosphoric acid, and boric acid, and examples of the organic acid include acetic acid, formic acid, malic acid, citric acid, and oxalic acid.
Functional water can also be produced using N ₃ C ₃ O ₃ NaCl ₂ or the like, which is commercially available as a weakly acidic water powder generator (for example, Quinosan 21X (trade name, manufactured by Clean Chemical Co., Ltd.)). These functional waters prepared by chemical preparation also have the ability to decompose halogenated aliphatic hydrocarbon compounds or aromatic compounds by irradiating light, although there is a difference in their decomposition ability, as in the case of functional water by electrolysis. Here, the raw water includes tap water, river water, seawater, and the like. These water p
H is usually between 6 and 8, and the chlorine concentration is at most 1 mg /
Less than a liter, such raw water does not, of course, have the resolution of halogenated aliphatic hydrocarbon compounds or aromatic compounds as described above.

(Compounds to be decomposed) Examples of the halogenated aliphatic hydrocarbon compounds to be decomposed include halogenated aliphatic hydrocarbon compounds and aromatic compounds. Examples of the halogenated aliphatic hydrocarbon compound include an aliphatic hydrocarbon compound substituted with at least one of a chlorine atom and a fluorine atom.

Specifically, for example, 1 to 4 chlorine-substituted methane, 1 to 6 chlorine-substituted ethane, 1 to 4 chlorine-substituted ethylene, 1 to 2 chlorine-substituted acetylene, and 1
To 8 chlorine-substituted product, 1 to 6 chlorine-substituted product of propylene, 1 to 4 chlorine-substituted product of allene (propadiene), 1 to 4 chlorine-substituted product of allylene (methylacetylene), 1 to 10 of butane
Chlorine-substituted product, 1-, 2- or iso-butene 1- to 8-chlorine-substituted product, 1,3-butadiene 1- to 6-chlorine-substituted product, etc.), trichlorofluoromethane (Freon-11), dichlorodifluoromethane ( CFC-12), chlorotrifluoromethane (CFC-13), bromotrifluoromethane (CFC-13)
13B1), carbon tetrafluoride (CFC-1)
4), dichlorofluoromethane (CFC-21), chlorodifluoromethane (CFC-22), trifluoromethane (CFC-23), 1,2-difluoro-1,1,2,2-tetrachloroethane, 1,1 1,2-Trichloro-1,2,2-trifluoroethane (Freon-113B), 1,2-dibromo-1-chloro-1,2,2-trifluoroethane (Freon-113B
2) 1,2-dichloro-1,1,2,2-tetrafluoroethane (Freon-114), 1,2-dibromo-1,1,2,2, tetrafluoroethane (Freon-114B2), 2 , 2-dichloro-1,1,1-trifluoroethane (CFC-123), chlorodifluoroethane (CFC-142), 1,1-difluoroethane (CFC-152), tetrafluoroethane,
Chloropentafluoroethane, hexafluoroethane
(CFC-116) and the like.

Further, an azeotropic mixture of the above compounds (for example, Freon-500, Freon-502), vinyl fluoride,
Examples include vinylidene fluoride, hexafluoropropylene, tetrafluoroethylene, chlorotrifluoroethylene, propylene hexafluoride, and the like.

Other than the above, halogenated aliphatic hydrocarbons in which the carbon atom is an aliphatic hydrocarbon having up to three carbon atoms and the hydrogen atom is substituted with at least one halogen atom selected from a fluorine atom, a chlorine atom, a bromine atom and the like. Is mentioned.

Specific examples of the aromatic compound include cyclic or aromatic halogenated hydrocarbons such as benzene, phenol, benzotrifluoride, perfluorobenzene, and perfluoromethyldecalin.
Further, a compound having a biphenyl structure may be mentioned. Specific examples of the compound having a biphenyl structure include biphenyl, dehydrodivanillic acid, 2-chlorobiphenyl, and 3-chlorobiphenyl.
Chlorobiphenyl, 4-chlorobiphenyl, 2,2'-dichlorobiphenyl, 3,3'-dichlorobiphenyl, 4,4'-
Dichlorobiphenyl, 2,4'-dichlorobiphenyl, 2,
3-dichlorobiphenyl, 2,4-dichlorobiphenyl,
2,5-dichlorobiphenyl, 2,6-dichlorobiphenyl, 3,4-dichlorobiphenyl, 3,5-dichlorobiphenyl, 2,4,4′-trichlorobiphenyl, 2,2 ′, 5, trichlorobiphenyl, 2, 3 ', 5-trichlorobiphenyl, 2,4', 5-trichlorobiphenyl, 2 ', 3,4-trichlorobiphenyl, 2,3,4-trichlorobiphenyl,
2,3,6-trichlorobiphenyl, 2,4,5-trichlorobiphenyl, 2,4,6-trichlorobiphenyl, and the like. Further, the chlorine atom bonded to the above compound is replaced with a fluorine or bromine atom. Substituted biphenyl compounds can also be degraded. That is, the compound to be decomposed is not particularly limited as long as it can be decomposed by functional water and light.

(Light and Light Irradiation Conditions)
For example, a wavelength of 300 to 500 nm, particularly 350 to 45 nm
0 nm light is particularly preferred in terms of decomposition efficiency. The light irradiation intensity is 10 μm from the viewpoint of decomposition efficiency.
W / cm ² -10 mW / cm ² , especially 50 μW / cm ² -5 m
A W / cm ² bag enclosure is preferred. For example, in a light source having a peak at a wavelength of 365 nm, several hundred μW / cm ² (300 nm to 400 nm
(Measurement is performed), the decomposition is practically sufficient. As a light source of such light, natural light (for example, sunlight) or artificial light (mercury lamp, black light, color fluorescent lamp (blue), etc.) can be used.

The light irradiation may be performed directly from inside the reaction tank, or may be performed from outside the reaction tank via a reaction tank container. In this embodiment, since it is not necessary to use ultraviolet light having a wavelength of about 250 nm or less, which has a great influence on the human body, as light, glass or plastic can be used as a reaction tank.

(Neutralization step) After the decomposition reaction as the step (i) is completed or almost completed, the step (ii) is carried out.
The liquid obtained in (i), specifically, of a halogenated aliphatic hydrocarbon compound or an aromatic compound generated by contacting a halogenated aliphatic hydrocarbon compound or an aromatic compound with functional water under light irradiation. Water containing a decomposition product (for example, a halo acid such as dichloroacetic acid, etc.)
Neutralize so as to be within the range of ~ 8.

Although the mechanism of the decomposition of halogenated aliphatic hydrocarbon compounds and aromatic compounds by contact with functional water under light irradiation is still being elucidated, chlorine supplied from hypochlorous acid existing in water is not clear. Becomes a radical by light,
It is presumed that the radical is attacking the decomposition target compound. Therefore, the functional water used for the decomposition is often acidic, and the liquid obtained at the end of the decomposition step is also often acidic. If the acid is kept acidic, even if the halogenated aliphatic compound or aromatic compound is completely decomposed, there is a concern about the effect on the environment if the compound is released into the environment as it is. However, such concern can be eliminated by neutralizing the liquid obtained in step (i).

As the alkaline liquid used in such a neutralization step, for example, alkaline water generated on the cathode side by electrolysis of water containing an electrolyte can be used. When acidic functional water generated by electrolysis of water containing an electrolyte is used as the functional water, the alkaline water is naturally generated, and using the alkaline water in the neutralization step is a resource This can be said to be a particularly preferable embodiment from the viewpoint of effective utilization. When separately preparing alkaline water, it is preferable to use calcium carbonate or sodium hydroxide from the viewpoint of cost.

(Dechlorination of wastewater) By the way, if the ability to decompose the target compound for functional water is fully used, the residual chlorine concentration of the liquid after the decomposition treatment should be 1 mg / L or less. When draining while standing,
It is preferable to perform aeration, light irradiation, and the like to reduce the residual chlorine concentration to 1 mg / L or less. More preferably, the concentration should be reduced to a concentration that does not hinder the activity of microorganisms in the environment or the like.

Specific examples of the method include aeration of the liquid after the decomposition treatment and light irradiation.

The treated water having a low residual chlorine concentration so as not to hinder the activity of microorganisms in the environment or the like may be discharged into the environment as it is. Drainage may be performed. For example, the present inventors have found that when a halogenated aliphatic hydrocarbon compound is decomposed according to the present invention, a haloacetic acid is generated as a decomposition product. Specifically, the target compound is T
The present inventors have found that dichloroacetic acid is produced in the case of CE, and trichloroacetic acid is produced in the case where the compound to be decomposed is PCE. The treated water according to the present invention may contain such a small amount of such a halo acid. Here, by treating the treated water with a microorganism capable of decomposing the halo acid, the treated water can be purified to a state having higher environmental adaptability. That is, a decomposition process with less impact on the environment can be achieved.

(Microbial treatment) The microorganism used here may be in any form as long as it can decompose the decomposition products, but activated sludge or soil microorganisms can be used. When the decomposition product is a halo acid, for example, dichloroacetic acid, it is known that it is decomposed in a normal activated sludge tank. When the treated water contains dichloroacetic acid, the treated water is led to the activated sludge tank. Thereby, a microorganism treatment step of the treated water can be performed.

The present inventors introduced treated water containing trichloroacetic acid as a decomposition product into the activated sludge tank.
It has been confirmed that trichloroacetic acid can be decomposed. As described above, it is known that dichloroacetic acid can be easily decomposed by aerobic microorganisms. Examples of the isolated and identified microorganisms include, for example, Applied Microbiology and Biotechnology, Vol. 40, Fifteenth
8-164 pages (Applied Microbiology and Biotechnolog
y, 40, 158-164), disclosed by Heinz, U. and Rehm, HJ, et al.
Autotropicus (Xantbobactor autotorophicus GJ
It is considered that 10) and the like can be used in this step. In addition, as a microorganism having the ability to decompose halo acids such as dichloroacetic acid and trichloroacetic acid with extremely high efficiency, Renobacter sp. Strain AC ((Renobactor sp. Strain
AC) FERM BP-5353),
Although the details thereof are disclosed in JP-A-8-140665, this microorganism is also one of the microorganisms that can be used very suitably in this step.

The bacteriological properties of FERM BP-5353 are shown below. Identification criteria: According to Bergey's Manual (1984). A. Morphological properties Gram stain: negative Size and shape of cells: length 1.0 to 2.0 μm, width 0.2 to 0.2
B. bacilli exhibiting 0.5 mm C- and / or S-shape Motility: none Colony color: white to cream B. Growth in various media BHIA: good growth MacConkey: poor growth C. optimal temperature for growth: 25 ℃ ～ 35 ℃ D. Physiological property aerobic / anaerobic distinction: aerobic TSI (slant / butt): alkali / alkali, H2S (-) oxidase: positive Power tarase: positive I mentioned how,
When the liquid obtained in the step (i) does not affect the step of decomposing by a microorganism such as a halo acid, the neutralization step can be omitted.

Further, when it is assumed that the decomposition process of the decomposition products by the living organism is performed, in the above-described neutralization step, the pH may be adjusted to a pH that does not hinder the activity of the microorganism. Considering that the treated water is diluted by microbial treatment, the treated water is reduced to a level that does not affect the environment.
It is not always necessary to adjust H. Then, after completion of the microbial treatment process, the pH may be further adjusted if necessary, and the treated water may be finally discharged into the environment. For example, obtained by treatment with functional water under light irradiation,
When treated water containing TCE as a decomposition product is introduced into the activated sludge tank, if the pH is adjusted to about 4 to 9, preferably about 6 to 8, it will affect the activity of microorganisms in the activated sludge tank. Very little.

(Decomposition Apparatus) An apparatus for decomposing halogenated aliphatic hydrocarbon compounds and aromatic compounds using functional water will be described below. Examples of the constitution of the decomposing device for halogenated aliphatic hydrocarbon compounds and aromatic compounds include the following 1) and 2).

1) A configuration in which the compound to be decomposed is brought into contact with functional water by directly charging the compound to be decomposed into the electrolyzed water generating apparatus, and light is irradiated to this; FIG. 1 shows a halogen according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic of one embodiment of the decomposition apparatus of a fluorinated aliphatic hydrocarbon compound and an aromatic compound.

In FIG. 1, reference numeral 101 denotes a water tank. The water tank has electrodes 103 and 105, a diaphragm 107 such as an ion exchange membrane, a power supply 109 connected to the electrodes, a pipe 111 and a pump 113 for supplying water containing an electrolyte into the water tank, and a compound to be decomposed or the like. A pipe 115 and a pump 117 are provided for supplying a medium containing water into the water tank, and 119 mixes acidic functional water that has lost its activity by reacting with the compound in the water tank 101 and alkaline functional water generated on the cathode 103 side. It is a tank to store.

167 is a means for adjusting the pH of the mixed solution to between 6 and 8. 168 is a means for reducing residual chlorine to 1 mg / L or less, for example, an aeration tank. Note that a means for irradiating the mixed solution with light may be provided instead of the aeration means, or both may be used in combination. Reference numeral 169 denotes a microorganism treatment tank for treating a decomposition product.

The water in which the electrolyte is dissolved is supplied to the water tank 101 through the pipe 111, and the water tank 101 is filled with the water in which the electrolyte is dissolved. When power is supplied from the power supply 109 to the electrodes 103 and 105 for electrolysis, acidic water is generated on the anode 105 side.

A halogenated aliphatic hydrocarbon compound or an aromatic compound is continuously supplied from a pipe 115 at a desired flow rate to the water tank 1.
In addition, the light is supplied to the anode 105 side of the water tank 101 and is irradiated with light from a light source 166 installed outside or inside the water tank 101. Here, the halogenated aliphatic hydrocarbon compound and the aromatic compound are brought into contact with functional water, and decomposition is promoted by light irradiation. The decomposed gas is discharged from the discharge pipe 121.
When the gas is not discharged, the discharge pipe 121 is not necessarily required.

The functional water deactivated by the reaction with the halogenated aliphatic hydrocarbon compound or aromatic compound is supplied to the drainage pipe 1.
The water is discharged from the water tank 101 to the tank 119 through the port 18. At this time, the acidic functional water used for the decomposition and the cathode 103
Is mixed with the alkaline functional water generated on the side, and if necessary, the pH is adjusted by means of adjusting the pH of the mixed solution of 167.
H is adjusted to around 7.

Further, in the aeration tank 168, residual chlorine in the solution is volatilized and the chlorine is expelled from the solution. This solution is 1
It is sent to the microbial tank of No. 69 for microbial decomposition of the substance produced by the decomposition.

The microorganism used here may be in any form as long as it can decompose the decomposition product. For example, activated sludge can be used, and it is simple and preferable.

As the diaphragm, for example, the cations (for example, Na ⁺ , Ca ²⁺ , Mg ²⁺ , K ^+, etc.) existing on the anode side without moving the aqueous electrolyte solutions on the cathode side and the anode side to the opposite sides, respectively.
Exchange which allows irreversible transfer of cations to the cathode side and allows irreversible transfer of anions (eg, Cl ⁻ , SO ₄ ² −, HCO ₃ ⁻ etc.) present on the cathode side to the anode side. A membrane is preferably used. That is, by using an ion exchange membrane,
Functional water having characteristics as described below can be efficiently generated near the anode.

FIG. 2 is a schematic view of an embodiment of a decomposition apparatus in which a halogenated aliphatic hydrocarbon compound or an aromatic compound is dissolved in a liquid or a liquid medium. In FIG. 2, 137 is a tank for storing a liquid halogenated aliphatic hydrocarbon compound or aromatic compound or a liquid medium in which the halogenated aliphatic hydrocarbon compound or aromatic compound is dissolved, and 139 and 141 are stored in 137. A pipe and a pump for supplying a liquid to the functional water generator 123. 129 is a tank for storing an aqueous electrolyte solution,
31 and 133 are pipes and pumps for supplying the liquid stored in 129 to the functional water generator 123.

2) A structure in which the functional water created by the electrolyzed water generator is transferred to a decomposition treatment tank, a compound to be decomposed is introduced into the decomposition treatment tank, and the two are brought into contact with each other, and light irradiation is performed thereon; FIG. 5 is a schematic view of another embodiment of a device for decomposing a halogenated aliphatic hydrocarbon compound or an aromatic compound.
Functional water formed on the anode side 105 by the functional water generator 123 is continuously supplied to the decomposition tank 143 at a desired flow rate via a pump and a pipe 147.

The compound to be decomposed, for example, a gasified halogenated aliphatic hydrocarbon compound or aromatic compound is continuously supplied to the decomposition treatment tank 143 at a desired flow rate via the supply pipe 115 and the pump 117. The inside of the decomposition tank 143 is irradiated with light by the light irradiation device 166.

The compound to be decomposed and the functional water are brought into contact with the compound to be decomposed in the decomposition treatment tank 143, and the decomposition treatment is accelerated by light irradiation. The functional water used in the treatment is discharged from the decomposition treatment tank 143 to the tank 119. The purified gas is supplied to the discharge pipe 121
Is discharged from

The acidic functional water used for the reaction with the halogenated aliphatic hydrocarbon compound or aromatic compound is discharged from the water tank 143 to the tank 119 through the drain pipe 118. At this time, the acidic functional water used for the decomposition and the cathode 10
The alkaline functional water generated on the third side mixes with the alkaline functional water, and if necessary, the pH is adjusted to around 7 by means for adjusting the pH of the mixed solution of 167.

Further, in the aeration tank 168, the residual chlorine in the solution is volatilized, and the chlorine is expelled from the solution. This solution is 1
It is sent to the microbial tank of No. 69 for microbial decomposition of the substance produced by the decomposition.

The microorganism used here may be in any form as long as it can decompose the decomposition product. For example, activated sludge can be used, and it is simple and preferable.

FIG. 4 is a schematic view of still another embodiment of the decomposition apparatus according to the present invention. The functional water formed by the functional water generator 123 is supplied to a decomposition tank 143 via a pump 145 and a pipe 147. Supplied. On the other hand, from a tank 137 in which a liquid halogenated aliphatic hydrocarbon compound or aromatic compound or a liquid medium in which the halogenated aliphatic hydrocarbon compound or aromatic compound is dissolved is stored via a pump 141 and a pipe 139. A halogenated aliphatic hydrocarbon compound or an aromatic compound is supplied to the decomposition treatment tank 143.

Then, the inside of the decomposition treatment tank is irradiated with light by the light irradiation device 166. As a result, the compound to be decomposed comes into contact with the functional water, and the irradiation of light accelerates the decomposition of the halogenated aliphatic hydrocarbon compound or aromatic compound.

The functional water used for the reaction with the halogenated aliphatic hydrocarbon compound or aromatic compound is supplied to the drain pipe 11.
8, the water is discharged from the water tank 143 to the tank 119.
At this time, the acidic functional water used for the decomposition and the alkaline functional water generated on the side of the cathode 103 are mixed, and the pH is adjusted to around 7 by means of adjusting the pH of the mixed solution of 167 as necessary.

Further, in the aeration tank 168, the residual chlorine in the solution is volatilized, and the chlorine is expelled from the solution. This solution is 1
It is sent to the microbial tank of No. 69 for microbial decomposition of the substance produced by the decomposition.

The microorganism used here may be in any form as long as it can decompose the decomposition products. For example, activated sludge can be used, and it is simple and preferable.

In FIGS. 4 and 5, functional water generated by electrolysis is used, but functional water prepared by dissolving various reagents in raw water as well as by electrolysis can be used in the present configuration. At this time, the functional water generating device 123 generates functional water adjusted by dissolving the reagent,
5 and to a decomposition tank 143 via a pipe 147. Preferably, the functional water used for the decomposition is not mixed with the alkaline functional water, but is adjusted to around pH 7 in the mixing tank 119 by means of adjusting the pH of the mixed solution 167.

FIG. 3 is a schematic view of another embodiment of the decomposition apparatus according to the present invention, which is an apparatus assuming that the compound to be decomposed is easily vaporized such as trichloroethylene.

In FIG. 3, reference numeral 123 denotes a functional water generator,
51-1 to 151-5 are column-shaped compound decomposition tanks, respectively.
66-1 to 166-5 are light irradiation devices for irradiating each decomposition tank with light, 139 is a pipe for supplying acidic functional water obtained by the functional water generation device 123 to the decomposition vessel 151-1, and Represents a pump.

In FIG. 3, five decomposition tanks 151 are connected in series so that the halogenated aliphatic hydrocarbon compound or aromatic compound is in contact with the acidic functional water for a longer time.
Halogenated aliphatic hydrocarbon compounds and aromatic compounds not decomposed in the first to fourth decomposition tanks 151-1 to 151-4 are sequentially contacted with acidic functional water and irradiated with light in a downstream decomposition tank. This enables more complete decomposition. The number of decomposition vessels to be connected can be appropriately selected depending on the concentration of the compound to be decomposed, the ease of decomposition, and the like, and is not particularly limited.

The functional water used for the reaction with the halogenated aliphatic hydrocarbon compound and the aromatic compound is supplied to the drain pipe 11.
8 to a tank 119. At this time, the acidic functional water used for the decomposition and the alkaline functional water generated on the side of the cathode 103 are mixed, and the pH is adjusted to around 7 by means of adjusting the pH of the mixed solution of 167 as necessary.

Further, in the aeration tank 168, residual chlorine in the solution is volatilized, and the chlorine is expelled from the solution. This solution is 1
It is sent to the microbial tank of No. 69 for microbial decomposition of the substance produced by the decomposition.

The microorganism used here may be in any form as long as it can decompose the decomposition product. For example, activated sludge can be used, and it is simple and preferable.

When the compound to be decomposed is in a gaseous state, the contact area between the functional water and the compound to be decomposed is reduced while adopting an apparatus configuration as shown in FIG. It is possible to increase the contact time.

That is, in FIG. 6, reference numeral 151 denotes a reaction column, and the inside thereof is filled with a filler 157 which adsorbs, for example, a halogenated aliphatic hydrocarbon compound or an aromatic compound. 166 is a light irradiation device for irradiating the inside of the reaction column with light, 159 is a pipe provided with means for introducing a vaporized halogenated aliphatic hydrocarbon or aromatic compound into the reaction column 151, for example, a blower 128, and 123 is functional water. Generator 153 is the anode side 10 of the functional water generator 123
5 is a tank for storing the acidic functional water obtained in 5.

The functional water stored in the storage tank 153 is dropped into the reaction column 151 from the upper portion of the reaction column 151 by the pump 155. In this manner, gaseous halogenated aliphatic hydrocarbons and aromatic compounds are introduced into the reaction column from the top of the reaction column 151, respectively.
Introduced within.

The functional water flows down the filler in the reaction column 151, contacts the gaseous compound to be decomposed adsorbed on the filler, and irradiates the halogenated aliphatic hydrocarbon compound or aromatic compound by light irradiation. Decomposed.

The functional water used for the reaction with the halogenated aliphatic hydrocarbon compound or the aromatic compound is supplied to the drain pipe 11.
8, the water is discharged from the water tank 123 to the tank 119.
At this time, the acidic functional water used for the decomposition and the alkaline functional water generated on the side of the cathode 103 are mixed, and the pH is adjusted to around 7 by means of adjusting the pH of the mixed solution of 167 as necessary.

Further, in the aeration tank 168, residual chlorine in the solution is volatilized and the chlorine is expelled from the solution. This solution is 1
It is sent to the microbial tank of No. 69 for microbial decomposition of the substance produced by the decomposition.

The microorganism used here may be in any form as long as it can decompose the decomposition products. For example, activated sludge can be used, and it is simple and preferable.

As described above, the filler used herein is not particularly limited as long as it can increase the contact area between the functional water and the compound to be decomposed. For example, a porous material formed of an inorganic material or an organic material can be used. And a hollow body, a spherical body, and the like. Various particles used in the chemical industry, pharmaceutical industry, food industry, wastewater treatment system, and the like can be used.

(Regarding Treatment of Exhaust Gas) As is apparent from the above-mentioned various device configurations, according to the various embodiments of the present invention, it is possible to decompose a gaseous decomposition target compound. The present invention can also be effectively applied to purification of air, such as exhaust gas, which is contaminated with a halogenated aliphatic hydrocarbon compound or an aromatic compound discharged from a combustion furnace or a waste incinerator of a factory or the like.

The combustion gas discharged from factories and garbage incineration plants contains soot and other halogenated aliphatic hydrocarbon compounds and aromatic compounds, and fine dust causes respiratory diseases and the like. In addition, because of the strong carcinogenicity and mutagenicity of penspirene and dioxin, purification of exhaust gas is a very important technical issue.

Conventionally, such measures for removing harmful organic substances are as follows.
Processing operations such as dust collection, denitration, desulfurization, and desalination are performed by a method of individually and stepwise processing organic substances using, for example, an exhaust gas treatment device connected in series.

For example, Japanese Patent Application Laid-Open No. 5-115722 discloses a purification method in which a ceramic such as zeolite is used as an exhaust gas filter and the mechanical strength and impact resistance of the exhaust gas filter or the efficiency of collecting organic substances are enhanced. In any case, since the purification treatment is performed only by the filtration effect, relatively large soot and the like can be collected, but molecular organic substances can hardly be removed.

On the other hand, there have been proposed a number of purification devices for treating organic substances in exhaust gas by bringing them into contact with a catalyst.

For example, Japanese Patent Application Laid-Open No. 5-149127 discloses a method and an apparatus for detoxifying harmful organic substances such as soot and dioxin in exhaust gas by using an oxidation catalyst and a heating device therefor. The scale of the equipment depends on the amount of exhaust gas to be treated and the amount of organic matter contained in it, but the extraction of contaminated gas from incinerators and soil emits 50 to 500 m ³ / h of exhaust gas, so a heating device is required. Exhaust gas treatment facilities are quite large and their operating costs are enormous.

Japanese Patent Application Laid-Open No. Hei 6-246133 describes a method in which corona discharge is generated in exhaust gas to thermally decompose organic substances. In any case, particles such as low-molecular to high-molecular organic substances and soot can be decomposed and made harmless.

However, as in the case of the above-described catalytic decomposition, the concentration of harmful organic substances in the supplied exhaust gas changes with time. Particularly in the case of low-concentration pollution, it is necessary to maintain the heating of the catalyst or the high-frequency irradiation or corona discharge. There is a problem with the energy efficiency for purification. Further, it is difficult to perform high-concentration purification by the above-described organic oxidation treatment, and it is necessary to reduce the processing load by arranging purification devices in parallel or in series.

[0103] As a method of purifying exhaust gas more economically and with less environmental load, a treatment method and apparatus using microorganisms have also been proposed. For example, U.S. Pat. No. 4,090,099 describes a method of removing and purifying soot and gaseous pollutants in exhaust gas by decomposing the microorganisms with microorganisms.

In US Pat. No. 5,494,574, a purification reaction vessel is filled with a filler in which microorganisms are immobilized.
A method is described in which this is impinged in a reaction vessel, and contaminated water or gas containing harmful organic substances is purified through the reaction vessel. However, the organic matter that can be decomposed by the assimilation ability of the microorganism used is limited, and the decomposition requires a relatively long time. In contrast to such a conventional technique, the present embodiment involves contacting a halogenated aliphatic hydrocarbon compound or an aromatic compound with functional water as described above, and irradiating the functional water with the halogenated aliphatic hydrocarbon compound or aromatic compound. Halogenated aliphatic hydrocarbon compounds and aromatic compounds in the exhaust gas by contacting the exhaust gas with functional water and irradiating the light with light. It is expected that some of the aliphatic hydrocarbon compounds and aromatic compounds will be decomposed with certainty, and will be a very effective technique for purifying exhaust gas.

When the technique for decomposing halogenated aliphatic hydrocarbon compounds or aromatic compounds according to the present embodiment is applied to the purification of exhaust gas, the structure shown in FIG. It is considered that the apparatus having the configuration shown in FIG. 7 can be suitably used.

In FIG. 7, reference numeral 161 denotes a garbage incinerator;
Is a device for removing dust in exhaust gas emitted from a refuse incinerator (for example, an electric dust collector), 123 is a functional water generator, 165 is a reaction tank of functional water and exhaust gas from which a dust field has been removed, 166 is a light irradiation device for irradiating the inside of the reaction tank with light. The electrolyte aqueous solution storage means 129 stores an electrolyte aqueous solution necessary for generating functional water (a solution obtained by dissolving a water-soluble electrolyte in raw water).

The dust removing device 163 mainly removes dust contained in the exhaust gas generated at the time of incineration of garbage, and the collected dust can be taken out.
123 is a functional water generating means, and said functional water generating means 1
The acidic functional water obtained in the vicinity of the 23 anodes 105 can be supplied to the reaction tank 165.

In the reaction tank 165, the exhaust gas and the functional water are in efficient contact with each other, and a light irradiation device 166 is provided inside or outside the reaction tank 165 so as to capture the decomposition of organic substances. ing. Further, a halogenated aliphatic hydrocarbon compound and an aromatic compound are removed, and the purified exhaust gas is provided with a gas discharging means 121 of a reaction tank 165.

Next, the exhaust gas removing step having this configuration will be described. Exhaust gas from the garbage incinerator 161 is first introduced into a dust collecting device 163, and most of the dust is removed by this device. Further, the aqueous electrolyte solution is supplied from the tank 129 to the functional water generating means 123, and the functional water generating means 123
Is electrolyzed. And the functional water generating means 123
The functional water generated near the anode is sent to the reaction tank 165.

In the reaction tank 165, the exhaust gas and the functional water are mixed in contact with each other, and the inside of the reaction tank 165 is irradiated with light by the light irradiation device 166 to decompose the halogenated aliphatic hydrocarbon compound and the aromatic compound in the exhaust gas. And the exhaust gas is purified. Next, the treated exhaust gas is discharged from the exhaust port 121, and functional water used for treating the halogenated aliphatic hydrocarbon compound and the aromatic compound is also discharged from the drain port 118.

The acidic functional water used for the reaction with the halogenated aliphatic hydrocarbon compound or aromatic compound is discharged to a tank 119 through a drain pipe 118. At this time,
The acidic functional water used for the decomposition is mixed with the alkaline functional water generated on the cathode 103 side, and 167
The pH is adjusted to around 7 by means for adjusting the pH of the mixed solution.

Further, in the aeration tank 168, the residual chlorine in the solution is volatilized, and the chlorine is expelled from the solution. This solution is 1
It is sent to the microbial tank of No. 69 for microbial decomposition of the substance produced by the decomposition.

The microorganism used here may be in any form as long as it can decompose the decomposition product. For example, activated sludge can be used, and it is simple and preferable.

When the exhaust gas treatment apparatus for a refuse incinerator according to the present basic configuration was actually applied to exhaust gas treatment, 99 to 99.7% of organic chlorine compounds were decomposed and removed. Than this,
It is clear that this basic configuration has extremely excellent exhaust gas purification processing ability. When the apparatus having the configuration shown in FIGS. 6 and 7 is used for purifying exhaust gas, functional water used for decomposing halogenated aliphatic hydrocarbon compounds and aromatic compounds in the exhaust gas is discharged from a drain port 118. However, when the wastewater contains a large amount of solid matter such as soot, treatment such as filtration and sedimentation may be performed.

In FIGS. 6 and 7, functional water generated by electrolysis is used. However, not only electrolysis but also functional water prepared by dissolving various reagents in raw water can be used in this configuration. is there. In FIG. 6, the functional water generator 1
At 23, functional water adjusted by dissolving the reagent is generated and supplied to the reaction column 151 via the storage tank 153. The functional water used for the decomposition is not mixed with the alkaline functional water and sent to the mixing tank 119,
The pH is adjusted by means for adjusting the pH of the mixed solution of 7. In FIG. 7, functional water produced by dissolving a reagent is generated in the functional water generator 123 and supplied to the reaction tank 165. The functional water used for the decomposition is sent to the mixing tank 119, and is not mixed with the alkaline functional water.
The pH is adjusted by means of adjusting the pH of the mixed solution at 167.

When purifying the exhaust gas using the apparatus shown in FIG. 6, the supply rates of the functional water and the exhaust gas are adjusted so that the volume fraction of the exhaust gas in the reaction column becomes 0.5 or more. It is preferable to increase the gas-liquid contact area and the average residence time of the exhaust gas.

Although the various embodiments according to the present invention have been specifically described above, the present invention can be used in other embodiments. For example, the processing apparatus of the present invention is not limited to the exhaust gas of a garbage incinerator, but can also be used for the processing of general exhaust gas (e.g., automobile exhaust gas).

[0118]

The present invention will be described below in detail with reference to examples.

Example 1 Apparatus for Decomposing Trichlorethylene in Gas State The apparatus shown in FIG. 1 was prepared. Strongly acidic functional water generator 1
23 (trade name: strong electrolyzed water generator (Model FW-200; manufactured by Amano Corp.)) was provided with an introduction pipe 115 for introducing a gas containing TCE to the anode side. Was supplied to a gas supply device (standard gas generator, trade name: Gastec, PD-1B).

On the other hand, a pump 113 and a pipe 111 are provided so as to supply an aqueous electrolyte solution to a strongly acidic functional water generator 123 from a tank storing water in which the electrolyte is dissolved. 101 was filled with water in which the electrolyte was dissolved.

Next, air containing TCE was added at a gaseous phase concentration of 70%.
It was continuously fed at a flow rate of 50 mL / min at 0 ppm. At the same time, when the operation was performed using a strongly acidic electrolyzed water generator, it was confirmed that functional water having a pH of 2.1, an oxidation-reduction potential of 1150 mV, and a residual chlorine concentration of 54 mg / L was generated near the anode. Further, the light irradiation means 166 (black light fluorescent lamp)
(Toshiba, FL10BLB, 10W) was used to irradiate the anode side 105. The light irradiation intensity was set to 0.5 to 0.8 mW / cm ² .

Anode 105 of strongly acidic electrolyzed water generator 123
TCE in the waste liquid discharged from the drain port 118 on the side is extracted with hexane, and the concentration of TCE contained therein is determined by gas chromatography with an ECD detector (trade name: GC-14B; manufactured by Shimadzu Corporation). As a result, the TCE concentration was 0.03 ppm or less. However, 3.2 pm of dichloroacetic acid, which was considered to have been generated by decomposition of TCE, was observed.

The concentration of TCE in the gas discharged from the discharge pipe 135 was determined by gas chromatography with a FID detector (trade name: GC-14B; manufactured by Shimadzu Corporation, column: J &
W-DB-624). As a result, the TCE concentration in the exhaust gas was 1 ppm or less in gas phase concentration. The functional water used for treating the TCE discharged from the drain 118 is
In the tank 119, it was mixed with the alkaline functional water generated on the cathode 103 side. The pH at this time was 7.1. next,
When this solution was sent to an aeration tank of 168 and aerated at 200 mL / min, the chlorine concentration was reduced to 0.5 ppm or less.

Further, this solution was sent to a 169 microorganism tank. For the microorganism tank 169, soil and soil bacteria collected from Morinosato, Atsugi-shi, Kanagawa were used. When the microorganism was treated with a residence time of 6 hours, the peak of dichloroacetic acid, which was considered to be generated by the decomposition of TCE, disappeared.

(Example 2) Synthetic contaminated liquid decomposition apparatus Strongly acidic electrolyzed water generator (trade name: Strongly electrolyzed water generator (Model)
The disassembly apparatus shown in FIG. 2 was assembled using FW-200 (manufactured by Amano Corporation). The synthetic contaminated liquid is supplied to the contaminated liquid supply tank 13.
7 and a pipe 139 and a pump 141 were arranged so as to be supplied to the anode 105 side of the water tank of the functional water generation device 123 from No. 7. The water in which the electrolyte was dissolved was supplied from the storage tank 129 of the aqueous electrolyte solution to the water tank 101 by the transport pump 131 and the pipe 133. The contaminated liquid supply tank 137 was filled with a synthetic contaminated liquid having the following composition.

Composition of synthetic contaminated liquid; TCE 600 mg PCE 500 mg Chloroform 20 mg Water 1 liter When filled with the aqueous electrolyte solution, pH 2.1, redox potential 1100 mV,
Conditions for producing functional water with a residual chlorine concentration of 50 mg / L
(Electrolyte concentration of the aqueous electrolyte solution is 1000mg / L.
(1 minute), the strongly acidic electrolyzed water generator was started, and the light irradiation means 166 (black light fluorescent lamp (FL10
(BLB, 10 W)) to irradiate the inside of the water tank 101. The light irradiation intensity was set to 0.5 to 0.8 mW / cm ² .

One hour later, the waste liquid discharged from the outlet 118 of the water tank 101 was stored in a tank 119, and the concentrations of TCE, PCE and chloroform contained in the waste liquid were all 0.1 ppm or less. However, 12 pp of dichloroacetic acid, which is considered to have been generated by decomposition of TCE,
m, 10 ppm of trichloroacetic acid, which was considered to have been generated by the decomposition of PCE, was observed.

The functional water used for treating the halogenated aliphatic hydrocarbon discharged from the drain port 118 is supplied to a tank 119.
And mixed with the alkaline functional water generated on the cathode 103 side. The pH at this time was 7.1. Then, add this solution to 1
When sent to the aeration tank No. 68 and aerated at 200 mL / min, the chlorine concentration became less than 0.5 ppm.

Further, this solution was sent to a 169 microorganism tank. Activated sludge collected from the wastewater treatment tank of Canon Central Research Laboratory was used for the microorganism tank 169. When the microorganism was treated with the residence time set to 3 hours, the peaks of dichloroacetic acid and trichloroacetic acid, which were considered to have been generated by decomposition of TCE and the like, disappeared.

Example 3 Continuous Decomposition of Gaseous Trichlorethylene by Functional Water TCE decomposition experiments were performed using the decomposition apparatus shown in FIG. The same apparatus as used in Example 1 was used as the strongly acidic functional water generator 123, and the pH obtained on the anode side was used.
2.1, redox potential 1150mV, residual chlorine concentration 54mg /
100 mL of functional water with L using feed pipe 139
/ min was continuously supplied to the decomposition column 151-1. The decomposition column 151 has five columns in order to increase the average residence time of TCE gas, and one decomposition column has a capacity of approximately 1200.
mL.

Further, each of the decomposition columns was irradiated with light irradiating means 166-1 to 16-5 (FL10BLB, 10W, manufactured by Toshiba, a black light fluorescent lamp). The light irradiation intensity for each column was 0.5 to 0.8 mW / cm ² . On the other hand, air containing TCE having a gas phase concentration of 1700 ppm was supplied to a gas supply device 127 (standard gas generator, Gastec, PD-1).
B) Continuous decomposition column 1 at a flow rate of 100 mL / min
51-1 was fed to the lower part of the column.

The functional water discharged from the outlet 118 of the decomposition column 151-5 is stored in the tank 119,
The TCE concentration in the gas discharged from 21 was measured by gas chromatography.

As a result, the TCE concentration in the exhaust gas was 10 to 17 ppmV in gas phase. However, exit 118
8 ppm of dichloroacetic acid, which is considered to have been generated by decomposition of TCE, was observed in the functional water discharged from the reactor.

The functional water used in this treatment is stored in the tank 119
And mixed with the alkaline functional water generated on the cathode 103 side. The pH at this time was 7.1. Then, add this solution to 1
When sent to the aeration tank No. 68 and aerated at 200 mL / min, the chlorine concentration became less than 0.5 ppm.

Further, this solution was sent to a 169 microorganism tank. For the microorganism tank 169, soil and soil bacteria collected from Matsueda, Atsugi-shi, Kanagawa Prefecture were used. When the microorganism was treated with a residence time of 6 hours, the peak of dichloroacetic acid, which was considered to be generated by the decomposition of TCE, disappeared.

Example 4 Continuous Decomposition of Synthetic Contaminated Liquid with Functional Water An experiment for decomposing halogenated aliphatic hydrocarbons was carried out using the decomposition apparatus shown in FIG. As the strongly acidic functional water generator 123, trade name: Oasis Bio Half; manufactured by Asahi Glass Engineering Co., Ltd.
1. Functional water having an oxidation-reduction potential of 1150 mV and a residual chlorine concentration of 50 mg / L was continuously supplied to the decomposition vessel 143 using the pump 145 at a flow rate of 45 mL / min.

A synthetic contaminated liquid having the following composition is put into the tank 137, and the synthetic contaminated liquid is supplied to the contaminated liquid supply tank 1.
It was continuously supplied to the decomposition vessel 143 at a flow rate of 37 to 5 mL / min. Further, irradiation in the water tank was performed by light irradiation means 166 (black light fluorescent lamp (manufactured by Toshiba, FL10BLB, 10W). The light irradiation intensity was 0.5 to 0.8 mW / cm ^2.
And

Composition of synthetic contaminated liquid; TCE 600 mg PCE 500 mg Chloroform 20 mg Water 1 liter The amount of the solution in the decomposition vessel 143 is approximately 6000mL, TC
The average residence time of E and the like was 2 hours.

The waste liquid discharged from the outlet 118 of the decomposition vessel 143 was stored in a tank 119, and the concentrations of TCE, PCE and chloroform contained in the waste liquid were 0.1 ppm or less. However, slight peaks of dichloroacetic acid and trichloroacetic acid, which are considered to have been generated by the decomposition of TCE, were observed in the functional water discharged from the outlet 118.

The functional water used in this treatment is stored in the tank 119
And mixed with the alkaline functional water generated on the cathode 103 side. The pH at this time was 7.1. Then, add this solution to 1
When sent to the aeration tank No. 68 and aerated at 200 mL / min, the chlorine concentration became less than 0.5 ppm.

Further, this solution was sent to a 169 microorganism tank. In the microbial tank 169, soil bacteria including soil that had been collected from Morinosato, Atsugi City, Kanagawa Prefecture and were used were used. When the microorganism was treated with a residence time of 6 hours, the peak of dichloroacetic acid, which was considered to be generated by decomposition of TCE, and the peak of trichloroacetic acid, which was thought to be generated by decomposition of PCE, disappeared.

Example 5 Purification of Exhaust Gas Containing Halogenated Aliphatic Hydrocarbon Compound and Aromatic Compound Using Functional Water and Light Irradiation Gaseous halogenated aliphatic hydrocarbon compound using functional water shown in FIG. 6 A simulation experiment of exhaust gas purification was performed using a device for decomposing aromatic compounds. Functional water generator 123
The functional water generated on the anode 105 side (trade name: Oasis Bio Half; manufactured by Asahi Glass Engineering Co., Ltd.) was stored in the storage tank 153, from which it was allowed to flow down from the top of the reaction column 151 using the pump 155. . Storage tank 1
The amount of liquid sent from 53 to the reaction column 151 is 100 mL / min.
And The reaction column used here was 100 cm long,
A diameter of 10 cm and a filler (trade name: Biscopearl; manufactured by Rengo Co., Ltd., particle size: 2 mm) filled at a density of 0.1 g / cm ³ were used.

In FIG. 7, 127 indicates air containing dust, ethylene chloride, benzene, phenol, trichloroethylene and tetrachloroethylene at the concentrations shown in Tables 1 and 2 below (hereinafter referred to as "exhaust gas"). Was prepared. The reaction column 151 has an inlet for functional water and exhaust gas at the top, and a gas outlet and drain at the bottom.

The exhaust gas prepared above was introduced into this reaction column at 15 mL / min, functional water (hydrogen ion concentration pH value) obtained by electrolysis of water was 2.1, the working electrode was a platinum electrode, and the reference electrode was The oxidation-reduction potential when silver is silver monochloride is 1000 mV and the chlorine concentration is 45 mg / L.
It was introduced at 00 mL / min. Then, the functional water was contacted with the exhaust gas on the surface of the filler, and the filler was irradiated with light from a black light fluorescent lamp (FL10BLB, 10W, manufactured by Toshiba). Light irradiation intensity is 0.5 to 0.8 mW / cm ²
And

The functional water flowing down to the lower part of the reaction column 151 was discharged as drain water from a drain port 118.

A hexane extract of the wastewater for measuring the concentration of various halogenated aliphatic hydrocarbon compounds and aromatic compounds contained in the wastewater was measured by gas chromatography with an ECD. The concentrations of phenol, trichloroethylene and tetrachloroethylene were all less than 0.03 ppm. The exhaust gas purified in the reaction column was exhausted from the injection port 121 at the lower part of the reaction column as a treated gas. Table 1 below shows the concentration of each component in the treated exhaust gas.
Shown in

[0147]

[Table 1] However, some very small peaks such as dichloroacetic acid, which are considered to have been generated by decomposition of TCE or the like, were observed in the functional water discharged from the outlet 118.

Therefore, the functional water used in this treatment was first mixed in the tank 119 with the alkaline functional water generated on the cathode 103 side. The pH at this time was 7.1. Next, when this solution was sent to an aeration tank of 168 and aerated at 200 mL / min, the chlorine concentration became less than 0.5 ppm. This solution was further sent to a 169 microbial vessel. The soil and soil bacteria collected from Morinosato, Atsugi-shi, Kanagawa Prefecture were used in the microbial tank 169. When the microorganism was treated with a residence time of 6 hours, all peaks considered to have been caused by degradation products disappeared.

[0149]

As described above, according to the present invention, economical, safe and stable decomposition of halogenated aliphatic hydrocarbon compounds and aromatic compounds can be carried out at normal temperature and normal pressure.

Further, purification of exhaust gas containing various halogenated aliphatic hydrocarbon compounds and aromatic compounds can be performed very easily.

[Brief description of the drawings]

FIG. 1 is a schematic view of an apparatus for decomposing a halogenated aliphatic hydrocarbon compound and an aromatic compound according to an embodiment of the present invention.

FIG. 2 is a schematic view of an apparatus for decomposing a halogenated aliphatic hydrocarbon compound and an aromatic compound according to another embodiment of the present invention.

FIG. 3 is a schematic diagram of an apparatus for decomposing gaseous halogenated aliphatic hydrocarbon compounds and aromatic compounds according to another embodiment of the present invention.

FIG. 4 is a schematic view of an apparatus for decomposing a halogenated aliphatic hydrocarbon compound and an aromatic compound according to still another embodiment of the present invention.

FIG. 5 is a schematic view of an apparatus for decomposing a halogenated aliphatic hydrocarbon compound and an aromatic compound according to still another embodiment of the present invention.

FIG. 6 is a schematic view of an apparatus for decomposing gaseous halogenated aliphatic hydrocarbon compounds and aromatic compounds according to still another embodiment of the present invention.

FIG. 7 is a schematic view of an exhaust gas purifying apparatus according to an embodiment of the present invention.

[Explanation of symbols]

101 water tank 103 negative electrode 105 positive electrode 107 diaphragm 109 power supply 111, 115, 133, 139, 147 pipe 113, 117, 131, 141, 145 pump 118 drainage port 119 mixing tank 121 exhaust port 123 functional water generator 125 introduction pipe 127 Gas supply device 128 Blower 129 Electrolyte aqueous solution storage tank 137 Halogenated aliphatic hydrocarbon compound and / or aromatic compound-containing liquid storage tank (contaminated liquid supply tank) 143 Decomposition treatment tank 151 Reaction column 153 Storage tank 157 Filler 161 Garbage Incinerator 163 Dust removal device 165 Reaction tank 166 Light irradiation device 167 Adjustment device 168 Dechlorination device 169 Microbial tank

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C02F 1/461 C02F 3/34 Z 1/72 B01D 53/34 134E 3/34 C02F 1/46 101C

Claims (82)

[Claims] 1. A method for decomposing a halogenated aliphatic hydrocarbon compound or an aromatic compound, comprising: (i) functional water produced by electrolysis of water containing an electrolyte and a halogenated aliphatic hydrocarbon compound or an aromatic compound; And contacting under light irradiation; and (ii) the step (i)
Neutralizing the liquid obtained by the method described above, and a method for decomposing a halogenated aliphatic hydrocarbon compound or an aromatic compound. 2. The method according to claim 1, wherein the functional water communicates through a diaphragm.
The decomposition method according to claim 1, wherein the functional water is generated on the anode side by electrolysis of water containing an electrolyte in an electrolytic cell having a cathode and an anode disposed in each of the two regions. 3. The decomposition method according to claim 1, wherein the step (ii) has a step of mixing the liquid with an alkaline liquid. 4. The alkaline liquid is alkaline water generated on the cathode side by electrolysis of water containing an electrolyte in an electrolytic cell having a cathode and an anode disposed in two regions communicating with each other through a diaphragm. The decomposition method according to claim 3. 5. The method according to claim 3, wherein the alkaline liquid contains at least one of calcium carbonate and sodium hydroxide.
Or the decomposition method according to 4. 6. The decomposition method according to claim 1, wherein the step (ii) sets the pH of the liquid within a range of 6 to 8. 7. The decomposition method according to claim 1, further comprising the step of reducing the residual chlorine concentration of the liquid obtained in the step (ii) to 1 mg / L or less. 8. The method for reducing the residual chlorine concentration to 1 mg / L or less includes at least one of a step of aerating the liquid after the neutralization treatment and a step of irradiating the liquid after the neutralization treatment. Item 7. The decomposition method according to Item 7. 9. The liquid obtained by the step (ii),
The decomposition method according to any one of claims 1 to 8, further comprising a step of bringing the microorganism into contact with a microorganism having a resolution of haloacetic acid. 10. The method according to claim 9, wherein the microorganism is Renoobacter sp. AC strain (FERM BP-5353). 11. The decomposition method according to claim 1, further comprising a step of introducing the liquid obtained in the step (ii) into a tank containing activated sludge. 12. The method according to claim 1, wherein the step (ii) does not affect the activity of the microorganism having the ability to degrade the haloacetic acid.
The decomposition method according to claim 9, which is a step of adjusting pH. 13. The decomposition method according to claim 1, wherein the halogenated aliphatic hydrocarbon compound is an aliphatic hydrocarbon compound substituted with at least one of chlorine and fluorine. 14. The method according to claim 14, wherein the aliphatic hydrocarbon compound is trichlorofluoromethane, dichlorodifluoromethane, chlorotrifluoromethane, dichlorofluoromethane, chlorodifluoromethane, trifluoromethane, 1,2-difluoro-1,1,2,2- Tetrachloroethane, 1,1,2-trichloro-1,2,2-trifluoroethane, 1,2-dichloro-1,1,2,2-tetrafluoroethane, 2,2-dichloro-1,1,1,1 -Trifluoroethane, chlorodifluoroethane, 1,1-difluoroethane, tetrafluoroethane, chloropentafluoroethane, hexafluoroethane, dichloromethane, chloroform, chloroethylene,
14. The decomposition method according to claim 13, wherein the decomposition method is at least one of dichloroethylene, tetrachloroethylene, and trichloroethylene. 15. The decomposition method according to claim 1, wherein the aromatic compound is at least one of benzene and phenol. 16. The compound according to claim 1, wherein the aromatic compound has a biphenyl bond or a biphenyl skeleton.
3. The decomposition method according to any one of 2. 17. The compound having a biphenyl bond or a biphenyl skeleton is biphenyl, dehydrodivanillic acid, 2-chlorobiphenyl, 3-chlorobiphenyl, or 4-chlorobiphenyl.
Chlorobiphenyl, 2,2'-dichlorobiphenyl, 3,
3'-dichlorobiphenyl, 4,4'-dichlorobiphenyl, 2,4'-dichlorobiphenyl, 2,3-dichlorobiphenyl, 2,4-dichlorobiphenyl, 2,5-dichlorobiphenyl, 2,6-dichlorobiphenyl, 3,4-dichlorobiphenyl, 3,5-dichlorobiphenyl, 2,4,4'-trichlorobiphenyl, 2,2 ', 5-trichlorobiphenyl, 2,3', 5-trichlorobiphenyl, 2,4 ', 5 -Trichlorobiphenyl, 2 ', 3,4-trichlorobiphenyl,
2,3,4-trichlorobiphenyl, 2,3,6-trichlorobiphenyl, 2,4,5-trichlorobiphenyl, 2,4,
17. The decomposition method according to claim 16, wherein the decomposition method is at least one of 6-trichlorobiphenyl and a compound in which each chlorine in any of these compounds is substituted with fluorine or bromine. 18. The decomposition method according to claim 1, wherein the light is light including light in a wavelength range of 300 to 500 nm. 19. The decomposition method according to claim 18, wherein the light is light including light in a wavelength range of 350 to 450 nm. 20. The irradiation intensity of the light is 10 μW / cm ² to
The decomposition method according to claim 18 or 19, wherein the power is 10 mW / cm ² . 21. The irradiation intensity of the light is 50 μW / cm ² or more.
Decomposition method according to claim 20 which is 5 mW / cm ^2. 22. A method for decomposing a halogenated aliphatic hydrocarbon compound or aromatic compound, comprising: (i) irradiating functional water containing hypochlorous acid with the halogenated aliphatic hydrocarbon compound or aromatic compound. Contacting under; and (ii)
Neutralizing the liquid obtained in step (i). A method for decomposing a halogenated aliphatic hydrocarbon compound or aromatic compound. 23. The decomposition method according to claim 22, wherein the functional water is an aqueous solution of hypochlorite. 24. The decomposition method according to claim 23, wherein the hypochlorite is sodium hypochlorite or potassium hypochlorite. 25. The decomposition method according to claim 23, wherein the functional water further contains at least one of an inorganic acid and an organic acid. 26. The method according to claim 25, wherein the inorganic acid and the organic acid are at least one selected from hydrochloric acid, hydrofluoric acid, oxalic acid, sulfuric acid, phosphoric acid, acetic acid, formic acid, malic acid and citric acid. Disassembly method. 27. The decomposition method according to claim 22, wherein the step (ii) has a step of mixing the liquid and an alkaline liquid. 28. The alkaline liquid is alkaline water generated on the cathode side by electrolysis of water containing an electrolyte in an electrolytic cell provided with a cathode and an anode in each of two regions communicating with each other through a diaphragm. A method according to claim 27. 29. The decomposition method according to claim 27, wherein the alkaline liquid contains at least one of calcium carbonate and sodium hydroxide. 30. The step (ii) wherein the pH of the liquid is 6-8.
30. The decomposition method according to any one of claims 22 to 29, wherein 31. The decomposition method according to claim 22, further comprising the step of reducing the residual chlorine concentration of the liquid obtained in the step (ii) to 1 mg / L or less. 32. The step of reducing the residual chlorine concentration to 1 mg / L or less includes at least one of a step of aerating the liquid after the neutralization treatment and a step of irradiating the liquid after the neutralization treatment with light. Item 34. The decomposition method according to Item 31. 33. The decomposition method according to any one of claims 22 to 32, further comprising a step of bringing the liquid obtained in the step (ii) into contact with a microorganism having the ability to degrade haloacetic acid. 34. The method according to claim 33, wherein the microorganism is a Renoobacter sp. AC strain (FERMBP-5353). 35. The decomposition method according to claim 22, further comprising a step of introducing the liquid obtained in the step (ii) into a tank containing activated sludge. 36. The method according to claim 36, wherein the step (ii) does not affect the activity of the microorganism capable of degrading the haloacetic acid.
The decomposition method according to claim 33, which is a step of adjusting pH. 37. The decomposition method according to claim 22, wherein the halogenated aliphatic hydrocarbon compound is an aliphatic hydrocarbon compound substituted with at least one of chlorine and fluorine. 38. The aliphatic hydrocarbon compound is trichlorofluoromethane, dichlorodifluoromethane, chlorotrifluoromethane, dichlorofluoromethane, chlorodifluoromethane, trifluoromethane, 1,2-difluoro-1,1,2,2- Tetrachloroethane, 1,1,2-trichloro-1,2,2-trifluoroethane, 1,2-dichloro-1,1,2,2-tetrafluoroethane, 2,2-dichloro-1,1,1,1 -Trifluoroethane, chlorodifluoroethane, 1,1-difluoroethane, tetrafluoroethane, chloropentafluoroethane, hexafluoroethane, dichloromethane, chloroform, chloroethylene,
38. The decomposition method according to claim 37, wherein the decomposition method is at least one of dichloroethylene, tetrachloroethylene, and trichloroethylene. 39. The decomposition method according to claim 22, wherein the aromatic compound is at least one of benzene and phenol. 40. The aromatic compound is a compound having a biphenyl bond or a biphenyl skeleton.
35. The decomposition method according to any one of 35. 41. The compound having a biphenyl bond or a biphenyl skeleton is biphenyl, dehydrodipanillic acid, 2-chlorobiphenyl, 3-chlorobiphenyl, or 4-chlorobiphenyl.
Chlorobiphenyl, 2,2'-dichlorobiphenyl, 3,
3'-dichlorobiphenyl, 4,4'-dichlorobiphenyl, 2,4'-dichlorobiphenyl, 2,3-dichlorobiphenyl, 2,4-dichlorobiphenyl, 2,5-dichlorobiphenyl, 2,6-dichlorobiphenyl, 3,4-dichlorobiphenyl, 3,5-dichlorobiphenyl, 2,4,4'-trichlorobiphenyl, 2,2 ', 5-trichlorobiphenyl, 2,3', 5-trichlorobiphenyl, 2,4 ', 5 -Trichlorobiphenyl, 2 ', 3,4-trichlorobiphenyl,
2,3,4-trichlorobiphenyl, 2,3,6-trichlorobiphenyl, 2,4,5-trichlorobiphenyl, 2,4,
41. The decomposition method according to claim 40, wherein the decomposition method is at least one of 6-trichlorobiphenyl and a compound in which each chlorine in any of these compounds is substituted with fluorine or bromine. 42. The decomposition method according to claim 22, wherein the light is light including light in a wavelength range of 300 to 500 nm. 43. The decomposition method according to claim 42, wherein the light is light including light in a wavelength range of 350 to 450 nm. 44. The irradiation intensity of the light is 10 μW / cm ² to
The decomposition method according to claim 42 or 43, wherein the power is 10 mW / cm ² . 45. An irradiation intensity of the light is 50 μW / cm ² or more.
The decomposition method according to claim 44, wherein the power is 5 mW / cm ² . 46. A method for decomposing a halogenated aliphatic hydrocarbon compound or an aromatic compound, comprising: (i) functional water produced by electrolysis of water containing an electrolyte and a halogenated aliphatic hydrocarbon compound or an aromatic compound. And (ii) contacting the liquid obtained in the step (i) with a microorganism having the resolution of the compound contained in the liquid. A method for decomposing a fluorinated aliphatic hydrocarbon compound or aromatic compound. 47. The functional water is an acidic functional water generated on the anode side by electrolysis of water containing an electrolyte in an electrolytic cell in which a cathode and an anode are arranged in two regions communicating with each other via a diaphragm. A method according to claim 46. 48. A method for decomposing a halogenated aliphatic hydrocarbon compound or an aromatic compound, comprising: (i) functional water produced by electrolysis of water containing hypochlorous acid and a halogenated aliphatic hydrocarbon compound or Contacting with an aromatic compound under light irradiation; and (ii) the step
contacting the liquid obtained in (i) with a microorganism capable of decomposing the compound contained in the liquid, a method for decomposing a halogenated aliphatic hydrocarbon compound or an aromatic compound. 49. The compound according to claim 4, wherein said compound is haloacetic acid.
49. The decomposition method according to any one of 6 to 48. 50. The method according to claim 49, wherein the microorganism is Renobacter sp. (FERM BP-5353). 51. The decomposition method according to claim 46, wherein the step (ii) has a step of introducing the liquid obtained in the step (i) into a tank containing activated sludge. 52. The decomposition method according to claim 46, wherein the halogenated aliphatic hydrocarbon compound is an aliphatic hydrocarbon compound substituted with at least one of chlorine and fluorine. 53. The method according to claim 53, wherein the aliphatic hydrocarbon compound is trichlorofluoromethane, dichlorodifluoromethane, chlorotrifluoromethane, dichlorofluoromethane, chlorodifluoromethane, trifluoromethane, 1,2-difluoro-1,1,2,2- Tetrachloroethane, 1,1,2-trichloro-1,2,2-trifluoroethane, 1,2-dichloro-1,1,2,2-tetrafluoroethane, 2,2-dichloro-1,1,1,1 -Trifluoroethane, chlorodifluoroethane, 1,1-difluoroethane, tetrafluoroethane, chloropentafluoroethane, hexafluoroethane, dichloromethane, chloroform, chloroethylene,
53. The decomposition method according to claim 52, wherein the decomposition method is at least one of dichloroethylene, tetrachloroethylene, and trichloroethylene. 54. The decomposition method according to claim 46, wherein the aromatic compound is at least one of benzene and phenol. 55. The aromatic compound is a compound having a biphenyl bond or a biphenyl skeleton.
51. The decomposition method according to any one of 51. 56. The compound having a biphenyl bond or a biphenyl skeleton is biphenyl, dehydrodivanillic acid, 2-chlorobiphenyl, 3-chlorobiphenyl, or 4-chlorobiphenyl.
Chlorobiphenyl, 2,2'-dichlorobiphenyl, 3,
3'-dichlorobiphenyl, 4,4'-dichlorobiphenyl, 2,4'-dichlorobiphenyl, 2,3-dichlorobiphenyl, 2,4-dichlorobiphenyl, 2,5-dichlorobiphenyl, 2,6-dichlorobiphenyl, 3,4-dichlorobiphenyl, 3,5-dichlorobiphenyl, 2,4,4'-trichlorobiphenyl, 2,2 ', 5-trichlorobiphenyl, 2,3', 5-trichlorobiphenyl, 2,4 ', 5 -Trichlorobiphenyl, 2-, 3,4-trichlorobiphenyl,
2,3,4-trichlorobiphenyl, 2,3,6-trichlorobiphenyl, 2,4,5-trichlorobiphenyl, 2,4,
56. The decomposition method according to claim 55, which is at least one of 6-trichlorobiphenyl and a compound in which each chlorine of any of these compounds is substituted with fluorine or bromine. 57. A method for purifying a medium contaminated with a halogenated aliphatic hydrocarbon compound or an aromatic compound, comprising: (i) functional water and halogenated aliphatic hydrocarbon generated by electrolysis of water containing an electrolyte. Contacting a medium contaminated with at least one of the compound and the aromatic compound under light irradiation; and (ii) neutralizing the liquid obtained in the step (i). Purification method for used media. 58. The step (ii) includes a step of mixing alkaline functional water generated by electrolysis of water containing an electrolyte with the liquid obtained in the step (i).
Purification method according to 1. 59. A method for purifying a medium contaminated with a halogenated aliphatic hydrocarbon compound or an aromatic compound, the method comprising (i) functional water produced by electrolysis of water containing hypochlorous acid and halogenated fat Contacting a medium contaminated with at least one of an aromatic hydrocarbon compound and an aromatic compound under light irradiation; and (ii) neutralizing the liquid obtained in the step (i). A method for purifying contaminated media. 60. The purification method according to claim 59, wherein the functional water is an aqueous solution of hypochlorite. 61. The method according to claim 60, wherein the hypochlorite is sodium hypochlorite or potassium hypochlorite. 62. The purification method according to claim 57, wherein the halogenated aliphatic hydrocarbon compound is an aliphatic hydrocarbon compound substituted with at least one of chlorine and fluorine. 63. The aliphatic hydrocarbon compound is trichlorofluoromethane, dichlorodifluoromethane, chlorotrifluoromethane, dichlorofluoromethane, chlorodifluoromethane, trifluoromethane, 1,2-difluoro-1,1,2,2,2. Tetrachloroethane, 1,1,2-trichloro-1,2,2-trifluoroethane, 1,2-dichloro-1,1,2,2-tetrafluoroethane, 2,2-dichloro, 1,1,1 -Trifluoroethane, chlorodifluoroethane, 1,1-difluoroethane, tetrafluoroethane, chloropentafluoroethane, hexafluoroethane, dichloromethane, chloroform, chloroethylene,
63. The purification method according to claim 62, which is at least one of dichloroethylene, tetrachloroethylene, and trichlorethylene. 64. The purification method according to claim 57, wherein the aromatic compound is at least one of benzene and phenol. 65. The aromatic compound is a compound having a biphenyl bond or a biphenyl skeleton.
61. The purification method according to any of 61. 66. The compound having a biphenyl bond or a biphenyl skeleton is biphenyl, dehydrodivanillic acid, 2-chlorobiphenyl, 3-chlorobiphenyl, or 4-chlorobiphenyl.
Chlorobiphenyl, 2,2'-dichlorobiphenyl, 3,
3'-dichlorobiphenyl, 4,4'-dichlorobiphenyl, 2,4'-dichlorobiphenyl, 2,3-dichlorobiphenyl, 2,4-dichlorobiphenyl, 2,5-dichlorobiphenyl, 2,6-dichlorobiphenyl, 3,4-dichlorobiphenyl, 3,5-dichlorobiphenyl, 2,4,4'-trichlorobiphenyl, 2,2 ', 5-trichlorobiphenyl, 2,3', 5-trichlorobiphenyl, 2,4 ', 5 -Trichlorobiphenyl, 2 ', 3,4-trichlorobiphenyl,
2,3,4-trichlorobiphenyl, 2,3,6-trichlorobiphenyl, 2,4,5-trichlorobiphenyl, 2,4,
66. The purification method according to claim 65, which is at least one of 6, trichlorobiphenyl, and a compound in which each chlorine of any of these compounds is substituted with fluorine or bromine. 67. The purification method according to claim 57, wherein the light is light containing light in a wavelength range of 300 to 500 nm. 68. The purification method according to claim 67, wherein the light is light including light in a wavelength range of 350 to 450 nm. 69. An irradiation intensity of said light of 10 μW / cm ² to
69. The purification method according to claim 67, wherein the purification method is 10 mW / cm < ² >. 70. An irradiation intensity of the light is 50 μW / cm ² or more.
70. The purification method according to claim 69, wherein the purification rate is 5 mW / cm < ² >. 71. The purification method according to claim 57, further comprising the step of contacting the liquid obtained in the step (ii) with a microorganism having the ability to degrade haloacetic acid. 72. The purification method according to claim 71, wherein the microorganism is Lenobacter sp. (FERM BP-5353). 73. The method according to claim 57, further comprising a step of introducing the liquid obtained in the step (ii) into a tank containing activated sludge.
Or a purification method according to 59. 74. two regions communicating through a diaphragm;
An electrolytic cell provided with a pair of electrodes arranged in each region and a power supply for applying a potential between the pair of electrodes, a unit for supplying water in which an electrolyte is dissolved in the electrolytic cell, at least an anode side of the electrolytic cell; And a means for supplying at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound to be decomposed to a region on the anode side of the electrolytic cell. A device for decomposing at least one of a compound and an aromatic compound, further comprising means for mixing a liquid flowing down from a region on the anode side of the electrolytic cell with a liquid flowing down from the cathode side of the electrolytic cell. A disassembly apparatus characterized by the above-mentioned. 75. An apparatus for decomposing at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound,
Means for supplying functional water generated on the anode side by electrolysis of water in which an electrolyte is dissolved, wherein a cathode and an anode are arranged in each of two regions communicating with each other via a decomposition treatment tank and a diaphragm. Means for supplying a halogenated aliphatic hydrocarbon compound or an aromatic compound to be decomposed to the decomposition treatment tank and means for irradiating the decomposition treatment tank with light, and a wastewater from the decomposition treatment tank and the electrolyte A decomposition device comprising means for mixing alkaline water generated on the cathode side by electrolysis of water in which water is dissolved. 76. A decomposition apparatus used for decomposing at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound, comprising: a decomposition treatment tank containing functional water containing hypochlorous acid; and a halogenated fat to be decomposed. Means for supplying an aromatic hydrocarbon compound or an aromatic compound to the decomposition treatment tank and means for irradiating the decomposition treatment tank with light, and further comprising means for mixing wastewater from the decomposition treatment tank with an alkaline aqueous solution. A disassembly apparatus characterized by the above-mentioned. 77. The decomposition apparatus according to claim 74, further comprising means for reducing the residual chlorine concentration of the solution generated by said mixing means. 78. The method according to claim 77, wherein the means for reducing the residual chlorine concentration is at least one of a means for aerating the solution produced by the mixing means and a means for irradiating the solution produced by the mixing means with light. The disassembly apparatus according to any one of the preceding claims. 79. The decomposition apparatus according to any one of claims 74 to 78, further comprising: means for bringing a microorganism having a decomposition ability of the decomposition product into contact with the solution generated by the mixing means. 80. two regions communicating through a diaphragm;
An electrolytic cell provided with a pair of electrodes arranged in each region and a power supply for applying a potential between the pair of electrodes, a unit for supplying water in which an electrolyte is dissolved in the electrolytic cell, at least an anode side of the electrolytic cell; And a means for supplying at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound to be decomposed to a region on the anode side of the electrolytic cell. An apparatus for decomposing at least one of a compound and an aromatic compound, the apparatus further comprising means for contacting a liquid flowing down from a region on the anode side of the electrolytic cell with a microorganism having the ability to degrade halo acids. Disassembly equipment. 81. An apparatus for decomposing at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound,
Means for supplying a functional water generated on the anode side by electrolysis of water in which an electrolyte is dissolved, which is performed by disposing a cathode and an anode in each of two regions communicating with each other via a decomposition treatment tank and a diaphragm. Means for supplying a halogenated aliphatic hydrocarbon compound or an aromatic compound to be decomposed to the decomposition treatment tank, and means for irradiating the decomposition treatment tank with light. A decomposer comprising: means for contacting with microorganisms having a resolution of 1. 82. A decomposition apparatus used for decomposing at least one of a halogenated aliphatic hydrocarbon compound and an aromatic compound, comprising: a decomposition treatment tank containing functional water containing hypochlorous acid; and a halogenated fat to be decomposed. A means for supplying an aromatic hydrocarbon compound or an aromatic compound to the decomposition treatment tank and a means for irradiating the decomposition treatment tank with light, and bringing the wastewater from the decomposition treatment tank into contact with microorganisms having the ability to degrade halo acids. A disassembly device further comprising means.