JP2000102794A - Treatment of harmful material and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To treat a harmful material such as org. halogen based compd. in dumping site exuding water and industrial waste water. SOLUTION: This device is provided with an oxidizing and nitrifying aeration tank 12 for biologically decomposing an org. matter and ammoniac matter in waste water 11 and oxididing them to carbon dioxide and nitrate ion, a denitrification tank 13 for reducing and removing biologically the nitrate ion to gaseous nitrogen, a precipitatioin tank 14 for precipitating and separating microorganisms in the waste water, a mixing tank 15 for adding and mixing a flocculating agent 15a to water to be treated, a flocculating and precipitating column 16 for flocculating and precipitating the suspended substance (SS component) contained in a precipitating tank treated water, a sand filtering column 17 for removing a trace SS component, an activated carbon adsorption column 18 for removing a coloring component in the waste water and a treating tank 20 having a hydroxyl radical generating means 19 generating the hydroxyl radical in the waste water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for treating harmful substances for treating harmful substances such as organic halogen compounds in landfill leachate and industrial wastewater.

[0002]

2. Description of the Related Art Conventionally, wastewater such as landfill leachate and industrial wastewater is prepared in a preparation tank after adjusting the amount of water, pH, etc., and then organic substances and nitrogen components are removed in a biological treatment tank and coagulated in a coagulation sedimentation tank. Aggregation by the addition of an agent separates heavy metal and SS (floating substance) components. Thereafter, the supernatant liquid is decomposed by the accelerated oxidation treatment of the hardly decomposable organic substances such as dioxins in the liquid, and is discharged as treated water through a sand filtration tower and an activated carbon adsorption tower.

As a method for purifying water containing an organic chlorine compound, a method has been proposed in which peroxide water is added to water containing an organic chlorine compound and the compound is decomposed by irradiating it with ultraviolet light ( See JP-A-52-035445).

[0004]

However, the wastewater discharged from landfills and the smoke discharged from the chimneys of garbage incinerators include:
Various organic substances, coloring substances, nitrogen-containing components and the like are contained, and these components have a problem that the efficiency of decomposition by ultraviolet irradiation or ozone is remarkably reduced, and the treatment becomes difficult.

[0005] Therefore, the present invention decomposes even when various organic substances, coloring substances, nitrogen-containing components, and the like are contained in the effluent from landfills and the washing wastewater obtained by cleaning the inside of the refuse incinerator. An object of the present invention is to provide a method and an apparatus for treating harmful substances that do not reduce the efficiency.

[0006]

Means for Solving the Problems To solve the above-mentioned problems, the invention of claim 1 provides an organic matter, a nitrogen component, and a sulfur component in waste water.
After removing the S component and the coloring component, the hardly decomposable substances in the wastewater are decomposed in the presence of hydroxy radicals in the wastewater.

[0007] According to the invention of claim 2, a surfactant is added to the waste water to desorb the hardly decomposable substance adsorbed to the SS component, and the desorbed hardly decomposed substance in the waste water contains hydroxyl radicals. And then solid-liquid separation.

[0008] The invention of claim 3 provides an ultrasonic wave generated in the waste water to desorb the hardly decomposable substance adsorbed to the SS component, and converts the hardly decomposed substance desorbed in the waste water to the presence of a hydroxyl radical. It is characterized in that it is decomposed below and then solid-liquid separated.

[0009] The invention of claim 4 is characterized in that, in claim 1, 2, or 3, the method for generating hydroxyl radicals comprises irradiating ozone with ultraviolet rays by an ultraviolet lamp.

According to a fifth aspect of the present invention, in the method of the first, second or third aspect, the method for generating a hydroxyl radical uses an ozone and hydrogen peroxide in combination and irradiates ultraviolet rays with an ultraviolet lamp. And

The invention of claim 6 is characterized in that, in claim 1, 2, or 3, the method for generating hydroxyl radicals comprises irradiating hydrogen peroxide with ultraviolet rays from an ultraviolet lamp.

The invention according to claim 7 is the invention according to claim 1, 2 or 3, wherein the hardly decomposable substance in the wastewater is at least one selected from dioxins, polychlorinated biphenyls, chlorobenzenes, chlorophenol and chlorotoluene. It is characterized by being a kind.

The invention of claim 8 provides an oxidation / nitrification aeration tank for biologically decomposing organic substances and ammonia nitrogen in wastewater and oxidizing them to carbon dioxide and nitrate ions. A denitrification tank for reducing and removing nitrogen gas, a sedimentation tank for sedimenting and separating microorganisms in wastewater, a mixing tank for adding and mixing a flocculant to the sedimentation treatment water, and a suspension contained in the sedimentation tank treatment water. A treatment tank having a coagulation sedimentation tower for coagulating and sedimenting a substance, a sand filtration tower for removing trace SS components, an activated carbon adsorption tower for removing coloring components in wastewater, and a hydroxy radical generating means for generating hydroxyl radicals in the wastewater And characterized in that:

According to a ninth aspect of the present invention, in the eighth aspect, an ozone dissolving means for dissolving recycled ozone in wastewater introduced into the treatment tank is provided.

[0015] A tenth aspect of the present invention is characterized in that, in the eighth aspect, a circulating means for circulating wastewater in the processing tank is provided.

[0016] The invention of claim 11 provides a stirring tank for adding a surfactant to the waste water and stirring to desorb the hardly decomposable substances adsorbed on the SS component, and for generating hydroxyl radicals in the waste water. It has a hydroxyl radical generating means, and is provided with a treatment tank for decomposing the desorbed hardly decomposable substance, and a solid-liquid separating means for solid-liquid separating SS components in the wastewater.

The invention of claim 12 provides an ultrasonic wave generation tank for desorbing the hardly decomposable substance adsorbed on the SS component in the waste water by the ultrasonic wave generation means, and a hydroxyl radical generation for generating a hydroxyl radical in the waste water. And a treatment tank for decomposing the desorbed hardly decomposable substance, and a solid-liquid separation means for solid-liquid separation of the SS component in the wastewater.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the method and apparatus for treating harmful substances according to the present invention will be described below, but the present invention is not limited to these embodiments.

[First Embodiment] A first embodiment of the present invention will be described with reference to FIG. The harmful substance treatment apparatus according to the present embodiment includes an oxidation / nitrification aeration tank 12 that biologically decomposes organic matter and ammonia in wastewater 11 and oxidizes them to carbon dioxide and nitrate ions. A denitrification tank 13 for reducing and removing nitrogen gas into a gas, a sedimentation tank 14 for sedimenting and separating microorganisms in wastewater, and a coagulant (for example, bansulfate, high-molecular polymer, etc.) 15a added to the sedimentation water. Mixing tank 15 for mixing, coagulation sedimentation tower 1 for coagulating and sedimenting suspended substances (SS components) contained in the treated water of the sedimentation tank
6, a sand filtration tower 17 for removing trace amounts of SS components, an activated carbon adsorption tower 18 for removing coloring components in wastewater, and a treatment tank 20 having a hydroxy radical generating means 19 for generating hydroxy radicals in wastewater. It becomes. In the present invention, since the hydroxy radical treatment is performed after removing the organic matter, nitrogen component, SS component, and coloring component in the wastewater, the hydroxy radical treatment is reliably performed, and the treatment of the hardly decomposable substance can be surely performed. .

Here, the hydroxy radical generating means in the present invention includes a method of irradiating ozone with ultraviolet rays by an ultraviolet lamp, a method of using ozone and hydrogen peroxide together,
A method of irradiating hydrogen peroxide with ultraviolet light from an ultraviolet lamp can be used. A method of irradiating the above-mentioned ozone with an ultraviolet ray by an ultraviolet lamp (for example, a low-pressure mercury lamp: output of 10 to 200 W) is as follows.
nm ultraviolet light with ozone (ozone concentration 10g / m ³ or more)
Irradiates to generate hydroxyl radicals. In the method of irradiating ozone and hydrogen peroxide with ultraviolet rays, the injection amount of hydrogen peroxide is 10 to 5000 mg /
Liter, and the injection amount of ozone is 50-5000 mg /
The liter is irradiated with ultraviolet rays from an ultraviolet irradiation lamp to generate hydroxyl radicals. In the method of irradiating the hydrogen peroxide with ultraviolet rays using an ultraviolet lamp, the amount of hydrogen peroxide to be injected is set to 10 to 5000 mg / liter, and hydroxyl radicals are generated by irradiating the ultraviolet rays with the ultraviolet lamp.

In this embodiment, as shown in FIG. 1, the method of irradiating the above-mentioned ozone with ultraviolet rays by an ultraviolet lamp is used as the hydroxy radical generating means, and an ozone generator 21 provided outside is used. Air diffuser 22
A bubble 23 containing ozone (O ₃ ) is introduced into the processing tank 11 through the, and the introduced ozone (O ₃ ) is irradiated with ultraviolet light (UV) from an ultraviolet irradiation lamp (UV lamp) 24. And promotes ozonolysis to generate hydroxy radicals (OH radicals).

Here, the reaction between ozone (O ₃ ) and ultraviolet radiation in water is represented by the following equation (1), and the strong hydroxyl radical (OH radical) generated is oxidatively decomposed to produce hardly decomposable substances. Decompose harmful substances.

O ₃ + UV → O ₂ + O, O + H ₂ O → 2 · OH (1) Incidentally, conventionally, since organic substances and nitrogen components have been mixed, these are preferentially hydroxyl radicals (OH
Radical) reaction, the effect of decomposing harmful substances has been greatly reduced. However, such organic substances, nitrogen components, SS components, and coloring components in the wastewater are removed in advance as in the present invention. The problem is solved.

The hardly decomposable substances to be decomposed in the present invention include harmful chlorinated aromatic compounds represented by dioxins and PCBs, high condensed aromatic hydrocarbons and other landfill leachate and industrial wastewater. This refers to harmful substances from wastewater, but harmful substances (or environmental hormones) in wastewater 11 such as landfill leachate, industrial wastewater, etc. which can be decomposed by the hydroxyl radical of the present invention, wastewater from shredder dust treatment, and smoke washing wastewater. However, it is not limited to these.

Here, the dioxins are a general term for polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs).
It is said to be generated in trace amounts during the combustion of chlorine compounds and certain organic chlorine compounds, and is a chemically colorless crystal. There are 75 types of PCDDs and 135 types of PCDFs, depending on the number of chlorines, from monochloride to octachloride. Of these, dibenzo-p-dioxin tetrachloride (T ₄ CDD) is the most common. It is known to be highly toxic. In addition, as harmful chlorinated aromatic compounds, in addition to dioxins, various organic chlorine compounds (for example, aromatic compounds such as phenol and benzene (for example, chlorobenzenes, chlorophenol and chlorotoluene) ), Chlorinated alkyl compounds, etc.) and must be removed from the wastewater to be discharged as treated water, and can be decomposed by the present invention.

PCBs (polychlorinated biphenyls)
Is a generic term for compounds in which several chlorine atoms are added to biphenyl, and there are isomers depending on the number and positions of substitution of chlorine, and 2,6-dichlorobiphenyl, 2,2′-dichlorobiphenyl, 2,3,5 -Typical is trichlorobiphenyl, which is highly toxic and is known to have the potential to generate dioxins when incinerated.To be discharged as treated water, it must be removed from wastewater. Yes, it can be decomposed according to the present invention.

A method for treating harmful substances using such an apparatus for treating harmful substances will now be described with reference to FIG.

First, in the oxidation / nitrification aeration tank 12, organic matter and ammonia nitrogen in the waste water 11 are biologically decomposed and oxidized to carbon dioxide and nitrate ions. Next, in the denitrification tank 13, nitrate ions are biologically reduced and removed to nitrogen gas. Next, in the mixing tank 15, the microorganisms in the wastewater are precipitated and separated. Next, in the coagulation sedimentation tower 16,
Flocculant (bansulfate, high polymer, etc.)
Is added and mixed, and a suspended substance (SS component) contained in the treated water in the precipitation tank is coagulated and precipitated. Next, in the sand filtration tower 17, the trace SS component is removed. Next, in the activated carbon adsorption tower 18, the coloring components in the wastewater are removed. Finally, in the treatment tank 19, hydroxyl radicals are generated in the waste water to perform oxidative decomposition. When the amount of the trace SS component or the coloring component is small, the direct treatment tank 2 is provided without providing one or both of the sand filtration tower 17 and the activated carbon adsorption tower 18.
It may be set to 0 (shown by a broken line in the figure).

That is, the organic radicals such as organic halogen compounds, which are hardly decomposable substances in the waste water 11, are efficiently decomposed by the hydroxyl radicals generated by irradiating the ozone supplied from outside with an ozone generator with ultraviolet rays. It was. Further, as shown in the following equations (2) and (3), Fe ions and Cu
By supplying ions and the like, the action of these ions can accelerate the decomposition reaction of the hydroxyl radical. That is, when the ions are supplied, ".OH" is largely generated, and the decomposition promoting effect is improved.

O ₃ + H ₂ O + Fe ²⁺ → OH + OH ⁻ + O ₂ + Fe ³⁺ (2) O ₃ + H ₂ O + Cu ⁺ → OH + OH ⁻ + O ₂ + Cu ²⁺ (3) Drainage from drainage 11
Harmful substances contained therein can be reliably treated.

[Second Embodiment] A second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment described above are the same as those in the first embodiment.
The same reference numerals as those used in the description of the embodiment are used, and the description thereof will be omitted.

As shown in FIG. 2, the harmful substance treatment apparatus according to this embodiment oxidizes and nitrifies to biologically decompose organic matter and ammonia nitrogen in waste water 11 and oxidize them to carbon dioxide and nitrate ions. A tank 12, a denitrification tank 13 for biologically reducing and removing nitrate ions to nitrogen gas, a sedimentation tank 14 for sedimenting and separating microorganisms in wastewater, and a coagulant (bansulfate, high And a mixing tank 15 for adding and mixing a suspended polymer (SS component) contained in the treated water of the precipitation tank.
A sand filtering tower 17 for removing trace SS components, an activated carbon adsorption tower 18 for removing coloring components in wastewater, a treatment tank 20 having a hydroxy radical generating means 19 for generating hydroxyl radicals in wastewater, and a treatment tank. An ozone collecting means 31 for collecting ozone (O ₃ ) not contributing to decomposition in the processing tank 20 from the upper part of the processing tank 20 through a pipe 31a and a pump 31b, and collecting the collected ozone (O ₃ ) in the processing tank 20 Ozone (O ₃ )
And an circulating means 23 comprising a pipe 33a and a pump 33b for circulating wastewater in the processing tank 11.

In this embodiment, as compared with the above-described embodiment, ozone not contributing to the reaction in the treatment tank 20 is dissolved in the wastewater in advance, and the amount of ozone in the wastewater increases. Therefore, the generation efficiency of the hydroxyl radical is greatly improved, and the drainage 11 is more improved than in the case of the above-described embodiment.
The decomposition efficiency of the organic halogen-based compound therein is improved, and the ozone can be effectively used.

Third Embodiment A third embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment described above are the same as those in the first embodiment.
The same reference numerals as those used in the description of the embodiment are used, and the description thereof will be omitted.

As shown in FIG. 3, the harmful substance treatment apparatus according to the present embodiment adds a surfactant 51 to the waste water 11 and stirs it with a stirring means 52 to remove the hardly decomposable substance adsorbed on the SS component. Tank 53 for desorbing water, hydroxy radical generating means 19 for generating hydroxyl radicals in the wastewater, a treatment tank 20 for decomposing the desorbed hardly decomposable substances, and solid-liquid separation of the wastewater after the decomposition treatment. And a solid-liquid separation tank 54 for removing SS components.

The surfactant to be added is not particularly limited, but may be, for example, a carboxylate (eg, sodium laurate such as soap), a sulfate, a sulfonate, or a phosphate. Anionic surfactants such as, for example, primary to tertiary amine salts and quaternary amine salts;
Cationic surfactants such as quaternary ammonium salts (eg, lauryltrimethylammonium chloride and the like);
Amphoteric surfactants such as carboxylate type (for example, sodium laurylaminopropionate), sulfate ester type, sulfonate type and phosphate ester type, polyethylene glycol type, polyhydric alcohol type and lower alcohol type; Nonionic surfactants and the like can be mentioned.

The amount of the surfactant to be added is not particularly limited, but may be about several percent or less of the wastewater in the stirring tank.

The solid-liquid separation means for separating the SS component in the wastewater is not particularly limited, and examples thereof include a pressure flotation method, a coagulation sedimentation method, a sand filtration method and a membrane separation method. .

As described above, before the treatment with the hydroxy radical, a surfactant is added to desorb hardly decomposable substances such as dioxins adsorbed on the SS component in the wastewater into the wastewater, thereby directly The desorbed hardly decomposable substance can be decomposed with hydroxy radicals, and the decomposition processing efficiency is improved.

As in the second embodiment, this embodiment also includes a circulating means for circulating the wastewater in the treatment tank, and circulates the wastewater to promote the reaction of the hydroxyl radical. The decomposition efficiency may be improved.

[Fourth Embodiment] A fourth embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment described above are the same as those in the first embodiment.
The same reference numerals as those used in the description of the embodiment are used, and the description thereof will be omitted.

The harmful substance processing apparatus according to the present embodiment generates ultrasonic waves as shown in FIG.
An ultrasonic wave generation tank 55 for imparting micro vibration of the SS component in the wastewater to desorb the hardly decomposable substances adsorbed on the SS component, and a hydroxyl radical generating means 19 for generating a hydroxyl radical in the wastewater, A treatment tank 20 for decomposing the desorbed hardly decomposable substances, and a solid-liquid separation of the waste water after the decomposition process to form a SS
And a solid-liquid separation tank 54 for removing components. The solid-liquid separation means is the same as in the third embodiment. In addition, as in the second embodiment, also in the present embodiment, a circulating means for circulating the wastewater in the treatment tank is provided, and the wastewater is circulated to promote the reaction of the hydroxyl radical, thereby improving the decomposition efficiency. You may make it improve.

As described above, prior to the treatment with the hydroxy radical, the hardly decomposable substances such as dioxins adsorbed on the SS component in the wastewater were desorbed into the wastewater by the generation of ultrasonic waves, so that they were directly desorbed. The hardly decomposable substance can be decomposed with a hydroxy radical, and the decomposition processing efficiency is improved.

[0044]

Embodiments of the present invention will be described below, but the present invention is not limited to these embodiments.

FIG. 5 is a schematic view of the apparatus used in the embodiment. As shown in FIG. 5, the test apparatus includes a processing tank 42 having an ultraviolet irradiation lamp 41 disposed therein, and a bubble 45 containing ozone from an external ozone generator 44 through a diffuser 43 in the processing tank 42. , A constant temperature bath 46 for maintaining the processing tank 42 at a constant temperature, and a stirrer 48 for rotating a stirrer 47 in the processing tank 42. Reference numeral 49 indicates a UV cover.

Further, dioxins were added to landfill leachate having the composition shown in Table 1 below to adjust the concentration to 0.6 ng-TEQ / liter, which was used as a test sample. Table 2 shows the conditions of the test apparatus.

[0047]

[Table 1]

[0048]

[Table 2]

COMPARATIVE EXAMPLE 2 liters of landfill leachate adjusted to a concentration of 0.6 ng-TEQ / liter was placed in a treatment tank 42, and ozone-containing bubbles 45 were treated under the conditions shown in Table 2 below. While being introduced into the tank via the diffuser 43,
Ultraviolet irradiation was performed from an ultraviolet irradiation lamp 41. As a result, after about 480 minutes, the dioxin concentration in the raw water (0.6)
ng-TEQ / liter) is decomposed to a concentration of 0.1 ng-TEQ / liter, and the decomposition reaction rate is 0.00104 n
g-TEQ / liter · min.

[Example 1] Landfill leachate adjusted to a concentration of 0.6 ng-TEQ / liter was previously treated by a biological nitrification and denitrification method, and BOD, CODMn,
NH ₄ —N and TN each have a BOD of 12.0 mg /
Liter, 8.0 mg / liter of CODMn, NH ₄ −
The concentration of N was reduced to 2.0 mg / liter and the concentration of TN was reduced to 3.0 mg / liter. This was filtered through a 0.45 μm filter to remove the SS component, and operated under the same conditions as in the comparative example. As a result, after the treatment for about 30 minutes, the dioxin concentration (0.6 ng-TEQ / liter) in the raw water was decomposed to a concentration of 0.1 ng-TEQ / liter. The decomposition reaction rate at this time was 0.0167 ng-TEQ.
/ Liter · minute, and the decomposition was performed at an extremely high rate, which is 16 times that of the comparative example.

[Example 2] In Example 2, 0.45 μm was used.
Further to the processing liquid was filtered with m filter, FeSO ₄ ·
The same treatment as in Example 2 was carried out under the condition that 10 μM of 7H ₂ O was added. As a result, after the treatment for about 15 minutes, the concentration of dioxins in the raw water (0.6 ng-TEQ / liter) was 0.1 n.
Degraded to a concentration of g-TEQ / liter. The decomposition reaction rate at this time is 0.0333 ng-TEQ / liter.
Minutes, and the decomposition rate could be further increased than in Example 1. In addition, the same results as in Example 2 were obtained under the condition that 10 μM of Cu ⁺ was added.

[0052]

As described above, according to the first aspect of the present invention, the organic matter, the nitrogen component, the SS component, and the coloring component in the wastewater are removed, and then the wastewater is removed in the presence of a hydroxyl radical in the wastewater. Decomposes the hardly decomposable substances in the wastewater,
The treatment of the hardly decomposable substance by the hydroxy radical treatment is ensured, and the treatment speed is improved.

According to the second aspect of the present invention, a surfactant is added to the waste water to desorb the hardly decomposable substances adsorbed on the SS component, and the hardly decomposed substances desorbed into the waste water are converted to hydroxy. Since decomposition treatment is performed in the presence of radicals and then solid-liquid separation, the desorbed hardly decomposable substance can be directly decomposed with hydroxy radicals, and the decomposition treatment efficiency is improved.

According to the third aspect of the present invention, ultrasonic waves are generated in the waste water to desorb the hardly decomposable substances adsorbed on the SS component, and the hardly decomposed substances desorbed in the waste water are converted into hydroxyl radicals. Since the decomposition treatment is performed in the presence and then the solid-liquid separation is performed, the desorbed hardly decomposable substance can be directly decomposed with the hydroxy radical, and the decomposition treatment efficiency is improved.

According to the invention of claim 4, claim 1,
In the method of 2 or 3, the method of generating hydroxy radicals involves irradiating ozone with ultraviolet rays from an ultraviolet lamp, so that hydroxy radicals are efficiently generated and decomposition of harmful substances is promoted.

According to the invention of claim 5, claim 1,
In 2 or 3, the method for generating hydroxy radicals uses ozone and hydrogen peroxide in combination and irradiates with ultraviolet rays, so that hydroxy radicals are generated efficiently and decomposition of harmful substances is promoted.

According to the invention of claim 6, claim 1,
In the method described in 2 or 3, the method for generating hydroxyl radicals involves irradiating hydrogen peroxide with ultraviolet rays from an ultraviolet lamp, so that hydroxyl radicals are generated efficiently and decomposition of harmful substances is promoted.

According to the invention of claim 7, claim 1,
In 2 or 3, at least one selected from dioxins, polychlorinated biphenyls, chlorobenzenes, chlorophenol and chlorotoluene as the hardly decomposable substance in the wastewater is completely decomposed.

According to the invention of claim 8, an oxidation / nitrification aeration tank for biologically decomposing organic substances and ammonia nitrogen in waste water and oxidizing it to carbon dioxide and nitrate ions, A denitrification tank for reducing and removing nitrogen gas in a specific manner, a sedimentation tank for precipitating and separating microorganisms in wastewater, a mixing tank for adding and mixing a coagulant to the sedimentation treatment water, and a sedimentation tank treatment water. It has a coagulation sedimentation tower that coagulates and precipitates suspended substances, a sand filtration tower that removes trace amounts of SS components, an activated carbon adsorption tower that removes coloring components in wastewater, and a hydroxy radical generation means that generates hydroxy radicals in wastewater. Since it is equipped with a treatment tank, the organic matter, the nitrogen component, the SS component, and the coloring component that preferentially react with the hydroxyl radical in the wastewater are removed in advance, and the treatment of the hardly decomposable substances in the wastewater is surely performed. Degree is improved.

According to the ninth aspect of the present invention, in the eighth aspect, the ozone dissolving means for dissolving the recycled ozone in the wastewater introduced into the treatment tank is provided, so that the efficiency of generating hydroxy radicals is greatly improved. The decomposition efficiency of the organic halogen compound in the waste water 11 is improved as compared with the above-described embodiment, and the ozone can be effectively used.

According to the tenth aspect, an eighth aspect is provided.
In the above, the circulation means for circulating the wastewater in the treatment tank is provided, so that the wastewater is circulated to promote the reaction of the hydroxyl radical and improve the decomposition efficiency.

According to the invention of claim 11, a surfactant is added to the waste water and stirred to desorb the hardly decomposable substances adsorbed on the SS component, and the hydroxyl radical is added to the waste water. A means for generating hydroxyl radicals,
Since it is provided with a treatment tank for decomposing the desorbed hardly decomposable substance and solid-liquid separation means for solid-liquid separation of the SS component in the wastewater, the desorbed hardly decomposable substance is directly decomposed with hydroxy radicals. And the decomposition treatment efficiency is improved.

According to the twelfth aspect of the present invention, there is provided an ultrasonic wave generating tank for desorbing the hardly decomposable substance adsorbed on the SS component in the waste water by the ultrasonic wave generating means, and a hydroxy for generating hydroxy radicals in the waste water. A treatment tank having radical generating means for decomposing the desorbed hardly decomposable substance;
Since the apparatus is provided with a solid-liquid separation means for solid-liquid separation of the S component, the desorbed hardly decomposable substance can be directly decomposed with hydroxy radicals, and the decomposition efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a first embodiment of a harmful substance treatment apparatus according to the present invention.

FIG. 2 is a schematic configuration diagram of a second embodiment of a harmful substance treatment apparatus according to the present invention.

FIG. 3 is a schematic configuration diagram of a harmful substance processing apparatus according to a second embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a harmful substance processing apparatus according to a second embodiment of the present invention.

FIG. 5 is a schematic configuration diagram of a test apparatus of the present embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Drainage 12 Oxidation and nitrification aeration tank 13 Denitrification tank 14 Sedimentation tank 15 Mixing tank 16 Coagulation sedimentation tower 17 Sand filtration tower 18 Activated carbon adsorption tower 19 Hydroxy radical generation means 20 Processing tank 21 Ozone generator 22 Aeration tube 23 Ozone (O ₃₎ ) 24 ultraviolet irradiation lamp (UV lamp) 31a piping 31b pump 31 ozone recovery means 32 ozone dissolving tank 33a piping 33b pump 33 circulating means 41 UV irradiation lamps 42 treatment tank 43 aeration tube 44 ozone generator 45 O ₃ containing bubbles 46 a thermostat 47 Stirrer 47 48 Stirrer 49 UV cover 51 Surfactant 52 Stirring means 53 Stirring tank 54 Solid-liquid separation tank 55 Ultrasonic generation tank

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C02F 9/00 502 C02F 9/00 502P 502D 502H 502R 502N 503 503C 504 504A (72) Inventor Masamichi Asano Kanagawa, Japan 1-8-1, Koura, Kanazawa-ku, Yokohama-shi Mitsubishi Heavy Industries, Ltd. Yokohama Research Laboratory (72) Inventor Yasumichi Aoki 1-8-1, Koura, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Mitsubishi Heavy Industries, Ltd. Yokohama Research Laboratory (72) Inventor Takao Hashizume 12F, Nishiki-cho, Naka-ku, Yokohama-shi, Kanagawa F-term (reference) in Yokohama Heavy Industries, Ltd. BB04 BB06 BB07 BB16 BB17 BB18 BB19 BB20 4 D050 AA12 AB03 AB07 AB11 AB17 AB19 AB34 AB35 BB02 BB09 BC09 BC10 BD02 BD03 BD04 BD06 CA04 CA06 CA09 CA15 CA16 CA17 CA20

Claims (12)

[Claims] An organic matter, a nitrogen component, a SS component,
A method for treating harmful substances, comprising, after removing a coloring component, decomposing a hardly decomposable substance in the wastewater in the presence of a hydroxyl radical in the wastewater. 2. A surfactant is added to the waste water to desorb the hardly decomposable substances adsorbed on the SS component, and the hardly decomposed substances desorbed in the waste water are decomposed in the presence of hydroxy radicals. Thereafter, a method for treating harmful substances, comprising performing solid-liquid separation. 3. An ultrasonic wave is generated in the waste water to desorb the hardly decomposable substance adsorbed on the SS component, and the hardly decomposed substance desorbed in the waste water is decomposed in the presence of a hydroxyl radical. A method for treating harmful substances, comprising performing solid-liquid separation. 4. The method for treating harmful substances according to claim 1, wherein the method for generating hydroxyl radicals comprises irradiating ozone with ultraviolet rays using an ultraviolet lamp. 5. The method for treating harmful substances according to claim 1, wherein the method for generating hydroxyl radicals comprises using ozone and hydrogen peroxide together and irradiating ultraviolet rays with an ultraviolet lamp. 6. The method for treating harmful substances according to claim 1, wherein the method for generating hydroxyl radicals comprises irradiating hydrogen peroxide with ultraviolet rays using an ultraviolet lamp. 7. The method according to claim 1, wherein the hardly decomposable substance in the wastewater is at least one selected from dioxins, polychlorinated biphenyls, chlorobenzenes, chlorophenol and chlorotoluene. Hazardous substance treatment method. 8. An oxidation / nitrification aeration tank which biologically decomposes organic matter and ammonia nitrogen in wastewater and oxidizes them to carbon dioxide and nitrate ions, and biologically reduces and removes nitrate ions to nitrogen gas. A denitrification tank, a sedimentation tank for sedimenting and separating microorganisms in the wastewater, a mixing tank for adding and mixing a flocculant to the sedimentation treatment water, and a coagulation sedimentation for coagulating and sedimenting suspended substances contained in the sedimentation tank treatment water. A tower, a sand filtration tower for removing trace SS components, an activated carbon adsorption tower for removing coloring components in wastewater, and a treatment tank having a hydroxy radical generating means for generating hydroxy radicals in wastewater. Hazardous substance processing equipment. 9. The harmful substance processing apparatus according to claim 8, further comprising an ozone dissolving means for dissolving recycled ozone in wastewater introduced into the treatment tank. 10. The harmful substance processing apparatus according to claim 8, further comprising a circulating means for circulating wastewater in the processing tank. 11. A stirring tank for adding a surfactant to waste water and stirring to desorb the hardly decomposable substances adsorbed on the SS component, and a hydroxy radical generating means for generating hydroxyl radicals in the waste water. A treatment tank for decomposing the desorbed hardly decomposable substance, and solid-liquid separation means for solid-liquid separation of SS components in the wastewater. 12. An ultrasonic wave generating tank for desorbing the hardly decomposable substance adsorbed on the SS component in the waste water by the ultrasonic wave generating means, and a hydroxy radical generating means for generating a hydroxyl radical in the waste water. An apparatus for treating harmful substances, comprising: a treatment tank that decomposes the hardly decomposed substances thus obtained; and a solid-liquid separation unit that performs solid-liquid separation of SS components in the wastewater.