JP2001179211A - Decomposition treating agent of chlorinated organic compound and decomposition treating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decomposition treating agent which is capable of decomposing a chlorinated organic compounds such as dioxins or PCB at a low cost and with ease and make effective use of fly ash, incineration ash or soil after treatment by the agent. SOLUTION: This decomposition treating agent contains an oxide or a peroxide of alkaline earth metal, the surface of which is oil-coated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a chlorinated organic compound for decomposing fly ash, incinerated ash, or dichlorinated organic compounds (hereinafter simply referred to as "chlorinated organic compounds") such as PCBs in soil. And a method for decomposing chlorinated organic compounds using such a decomposition treating agent.

[0002]

2. Description of the Related Art Dioxins are a general term for polychlorinated dibenzoparadioxins, polychlorinated dibenzofurans, etc., which cause skin and visceral disorders, have teratogenic and carcinogenic properties, and are extremely toxic. Substance. In particular, 2,3,7,8-dibenzoparadioxin, a dioxin in a narrow sense, is said to be one of the most toxic substances obtained by mankind. Other chlorinated organic compounds are also harmful to the human body. Among them, the toxicity of polychlorinated biphenyl (PCB) is considered to be a problem. Coplanar-PCB has a particularly toxic planar structure among PCBs. It is a thing.

In recent years, various problems of contamination by such highly toxic chlorinated organic compounds have been pointed out. In particular, it has been discovered that dioxins and coplanar-PCB may be generated by incineration of garbage, which is a further problem. That is, depending on the operating conditions of the garbage incineration plant, dioxins and coplanar-PCB are generated by incineration of the garbage, and the generated dioxins and coplanar-PCB are mixed into fly ash discharged from the garbage incineration plant, The exhaust from the chimney contains dioxins and coplanar PCBs,
Problems such as contamination of the soil around the incineration plant have occurred.
In addition, chlorinated organic compounds such as dioxins and PCBs are
Previously used pesticides, such as herbicides, had been included as impurities, but soils contaminated with dioxins and PCBs may still remain due to the use of the pesticides. In view of this situation, dioxins (PCDD / PCD) adsorbed on fly ash, incinerated ash or soil
Various chemical agents and heating methods have been proposed as methods for decomposing F) and PCBs.

[0004]

However, any of these measures has a problem that it is difficult to handle or that the cost is too high in terms of energy. Accordingly, there is a strong demand for a chemical that can decompose chlorinated organic compounds such as dioxins and PCBs simply by mixing it with fly ash, incineration ash, or soil without requiring a special device. The present invention has been made in view of such social demands, and is capable of inexpensively and easily decomposing chlorinated organic compounds such as dioxins and PCBs. An object of the present invention is to provide a decomposition treatment agent capable of effectively utilizing soil and a method for such decomposition treatment.

[0005]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, have found that a composition containing an oxide or peroxide of an alkaline earth metal can be used as a dioxin or PCB. Fly ash, incinerated ash or soil contaminated with chlorinated organic compounds
The inventors have found that chlorinated organic compounds in incinerated ash or soil are efficiently decomposed, and completed the present invention.

That is, the present invention is an agent for decomposing chlorinated organic compounds, which contains an oxide or peroxide of an alkaline earth metal. The alkaline earth metal oxide or peroxide contained in the decomposition treatment agent according to the present invention is preferably oil-coated. This oil coating prevents instantaneous reactions and can delay or control the reactions. Further, the reaction heat can be kept in the system, the chlorinated organic compound can be effectively decomposed, and the decomposition reaction can be improved.

The alkaline earth metal oxide or peroxide contained in the decomposition treatment agent of the present invention is preferably calcium or magnesium oxide or peroxide.
Particularly, calcium oxide or magnesium oxide is preferable from the viewpoint of safety. Further, when used in agricultural soil, it is desirable to contain magnesium oxide or peroxide in order to prevent magnesium deficiency and grow plants. The decomposition treating agent according to the present invention preferably further contains an alkali metal compound that decomposes the oil coating. Fly ash, incineration ash, or soil may contain an alkali metal compound.If a large amount is contained, it is not necessary to add the alkali metal compound, but the alkali metal compound is not included Or
Or, in the case of a trace amount, the oil coating cannot be destroyed, so add the alkali metal compound to the decomposition agent, or mix the decomposition agent with fly ash, incineration ash, or soil, and then further convert the alkali metal compound into an aqueous solution or detergent water, etc. It is preferred to add. In the decomposition treatment agent according to the present invention,
It is preferable to include a zeolite, in which case,
An effect is exhibited in which harmful heavy metals such as Cd and Pb are adsorbed to zeolite and are not eluted outside.

Further, the present invention further comprises adding and mixing a decomposition treatment agent containing an oxide or peroxide of an alkaline earth metal to fly ash, incineration ash or soil contaminated with chlorinated organic compounds. This is a method for decomposing fly ash, incinerated ash, or chlorinated organic compounds in soil.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The alkaline earth metal oxide or peroxide contained in the decomposition treatment agent according to the present invention is preferably oil-coated as described above. The oil used for the oil coating is not particularly limited, but if a vegetable oil is used, the treated soil can be effectively used for farming. Preferred vegetable oils include corn oil, rapeseed oil, coconut oil, palm oil, soybean oil, sesame oil, camellia oil, cotton oil, safflower oil, rice bran oil and the like.

[0010] The method of oil coating is not particularly limited. For example, the oil to be coated is dissolved in a volatile organic solvent, for example, alcohol, acetone, hexane, or the like, and an oxide or peroxide of an alkaline earth metal is added to the solution, and the volatile solution is stirred. The oil can be coated on the surface of the alkaline earth metal oxide or peroxide by removing the organic solvent by reduced pressure and / or heating. In this case, by adjusting the amount of the alkaline earth metal oxide or peroxide, the oil and the organic solvent, the amount of coating on the alkaline earth metal oxide or peroxide can be adjusted. . In order to achieve a uniform coating, the amount of the organic solvent is preferably 50 to 200 ml per 1 g of oil. When two or more kinds of alkaline earth metal compounds are used in combination, oil coating may be performed after mixing.
Alternatively, they may be mixed after being oil-coated, and are not particularly limited.

[0011] The heating for removing the solvent is preferably performed at 50 ° C or lower. Therefore, the solvent is usually removed under reduced pressure. The coating amount of the oil is preferably 0.3 to the alkaline earth metal oxide or peroxide.
To 10.0% by weight, more preferably 1.0 to 5.
0% by weight. The oxide or peroxide of the alkaline earth metal thus coated with oil is used immediately before use, that is, until immediately before addition to fly ash, incinerated ash, soil, etc.
It is preferably stored so as not to come into contact with moisture, especially moisture in the air. For example, it is preferably stored in an aluminum container (aluminum pack) or the like and opened just before use.

As described above, the oxide or peroxide of the alkaline earth metal contained in the decomposition treatment agent according to the present invention is preferably an oxide or peroxide of calcium or magnesium, particularly calcium oxide or peroxide. Magnesium oxide is preferred. Here, calcium oxide is represented by the chemical formula of CaO, which is usually called quicklime, and the production method and the like are not particularly limited. For example, calcium oxide is commercially available as a raw material for chemical industry and used as a desiccant, etc., and these calcium oxides can also be used. Calcium oxide is industrially usually produced by baking limestone (calcium carbonate), but one obtained by other methods can also be used.

The alkaline earth metal oxide or peroxide used in the present invention, particularly calcium oxide or magnesium oxide, is preferably in a powder form. The particle size of the powdered calcium oxide or magnesium oxide is not particularly limited, but is preferably 120 to 600 mesh, more preferably 200 to 400 mesh. Further, the method and conditions for pulverizing the oxide or peroxide of the alkaline earth metal are not particularly limited. In the case of calcium oxide and magnesium oxide, they are usually pulverized without water vapor to avoid a reaction with moisture.

When the decomposition treatment agent according to the present invention is used for fly ash or the like, calcium oxide, particularly oil-coated calcium oxide, is preferably used as an oxide or peroxide of an alkaline earth metal for reasons such as economy. May be used.
However, in soils where plants inhabit, such as cultivated soil, a mixture of oil-coated calcium oxide and oil-coated magnesium oxide is preferable in order to prevent damage due to excessive calcium. The amount of magnesium oxide is preferably from 10 to 50% by weight based on calcium oxide.

The decomposition treating agent according to the present invention preferably further contains an alkali metal compound. Examples of the alkali metal compound include carbonates, silicates and the like of alkali metals.
Chloride, sulfate, perchlorate, nitrate, phosphate and the like are exemplified. More specifically, potassium carbonate, sodium carbonate, sodium silicate, potassium chloride, sodium nitrate,
Preferred examples include potassium hydrogen carbonate, sodium perchlorate, sodium phosphate, sodium sulfate, potassium perchlorate, sodium hydrogen sulfate and the like. As these alkali metal compounds, commercially available drugs can be used, and not only anhydrous salts but also any hydrated salts can be used. As the alkali metal compound, only one kind may be used, or two or more kinds of alkali metal compounds may be used. When an oxide or peroxide of an alkaline earth metal is oil-coated, silicates, phosphates, alkali metal compounds such as sulfates, particularly by using silicates, fly ash after decomposition treatment, Incineration ash or soil
There is an effect that it can be reused as being suitable for landfill. Also, when using alkali metal silicate,
There is an effect that elution of the chlorinated organic compound is reduced.
Further, in order to reuse soil grown by plants in agricultural soil or the like, it is desirable to use a potassium metal compound to prevent potassium deficiency.

The content of the alkali metal compound is preferably 0.1 to 30 parts by weight, more preferably 1 to 5 parts by weight, based on 100 parts by weight of the total amount of the alkaline earth metal oxide or peroxide. is there. However, fly ash, incineration ash or soil may contain alkali metal compounds,
When it is contained in an amount of 1 part by weight or more, it is not always necessary to add the alkali metal compound. However, for simplification such as omitting the work of checking the content of the alkali metal compound, the ratio is 5 parts by weight or less. Is preferably mixed.

As described above, the decomposition treatment agent according to the present invention preferably further contains zeolite. In this case, harmful heavy metals such as Cd and Pb are adsorbed to the zeolite and are not eluted outside. The effect is exhibited. Zeolite is a general term for aluminosilicates containing an alkali metal or an alkaline earth metal. In the present invention, an artificial zeolite is preferably used.
The method for producing the artificial zeolite is not particularly limited, and may be obtained by any of the so-called dry method and wet method.

The type and particle size of the zeolite are not particularly limited, and commercially available ones can be used. For example, any type of zeolite such as H type, sodium type and calcium type can be used, but if cost is not considered, H type which is easily neutralized by ion exchange capacity is preferable. The zeolite content is 1 to 100 parts by weight of the total amount of the alkaline earth metal oxide or peroxide.
It is preferably 50 parts by weight, more preferably 5 to 10 parts by weight.

The decomposition treating agent of the present invention comprises an oxide or a peroxide of an alkaline earth metal, preferably an oxide or a peroxide of an alkaline earth metal whose surface is oil-coated, or an alkaline earth metal. It is composed of an oxide or peroxide of a class of metals, preferably an oxide or peroxide of an alkaline earth metal whose surface is oil-coated, and an alkali metal compound such as potassium carbonate or sodium carbonate, or zeolite. When it is composed of two or more components, it can be obtained by mixing the components.
The mixing method is not particularly limited. In addition, each component is separately added to fly ash, incinerated ash or soil, etc., and after addition to fly ash, incinerated ash or soil, etc., the decomposition treatment agent of the present invention therein, or the preferred decomposition treatment of the present invention An agent may be formed.
Incidentally, the decomposition treatment agent of the present invention, in addition to the above essential components,
Other components may be contained as long as the effects of the present invention are not impaired.

The decomposition treating agent of the present invention is added to fly ash, incinerated ash or soil contaminated with chlorinated organic compounds,
Decomposes chlorinated organic compounds in incineration ash or soil. In addition, in this specification, soil means including sludge. The amount added is fly ash, incinerated ash or 100% dry weight of soil.
It is usually 5 to 200 parts by weight, preferably 20 to 150 parts by weight, more preferably 25 to 1 part by weight with respect to parts by weight.
00 parts by weight.

The method of addition is not particularly limited. Normally,
A decomposition treatment agent containing an oxide or a peroxide of an alkaline earth metal whose surface is oil-coated is added to fly ash, incineration ash or soil contaminated with a chlorinated organic compound. The components may be separately added to fly ash, incineration ash or soil. In the method of the present invention,
In order to avoid rapid heat generation after adding and mixing the decomposition agent to fly ash, incineration ash or soil, the water content in the mixture before addition and mixing is preferably set to 30% by weight or less based on the total solid content, It is more preferably at most 20% by weight. Soil other than sludge usually contains 10 to 80% by weight of water, and sludge contains 80% by weight or more of water. On the other hand, fly ash and incinerated ash often have a water content of 5% by weight or less. Therefore, it is preferable to adjust the water content before adding and mixing the decomposition treatment agent of the present invention with fly ash, incinerated ash or soil. Adjustment of water, addition of water, natural drying (air drying),
There are heating drying and the like, but the method is not particularly limited. In order to adjust the water content, for example, in soils with a high water content, the alkaline earth metal oxide is added at a ratio of 20 parts by weight or less to 100 parts by weight of the soil, and the water content is adjusted by evaporating the water. May be.

Further, after the decomposition agent of the present invention is added to fly ash, incinerated ash or soil and mixed, the amount of water in the mixture is preferably 1 to 70% by weight based on the total solid content. It is preferable to adjust the water content, and the more preferable water content is 7 to 50% by weight. That is, it is preferable that the decomposition treatment agent of the present invention is added to and mixed with fly ash, incinerated ash or soil, and then water is added and mixed so as to be in the above range. If the water content exceeds the above range, the decomposition rate of the chlorinated organic compound decreases.

In the method for decomposing fly ash, incinerated ash or chlorinated organic compounds in soil according to the present invention, the case where the oxide or peroxide of the alkaline earth metal in the decomposition agent is oil-coated. Is added and mixed with a decomposition treatment agent not containing an alkali metal compound, and further decomposes or dissolves the coated oil to react with an alkaline earth metal oxide or peroxide and water. Hydrogen peroxide water, detergent water (the detergent is for dissolving the oil, and any detergent may be used.
For example, neutral detergent, acidic detergent, alkaline detergent, etc.),
It is preferable to add and mix at least one of an aqueous solution of a monohydric alcohol such as isopropyl alcohol and an aqueous solution of a polyhydric alcohol such as ethylene glycol to fly ash, incinerated ash or soil. By the addition and mixing, the decomposition rate of the chlorinated organic compound is improved, and fly ash, incinerated ash or soil after the decomposition treatment can be reused such as landfill. The decomposition treatment according to the present invention is performed by adding at least one of an aqueous solution of an alkali metal compound, aqueous hydrogen peroxide, detergent water, an aqueous solution of a monohydric alcohol such as isopropyl alcohol, and an aqueous solution of a polyhydric alcohol such as ethylene glycol. The water content after the addition and mixing of the agent may be adjusted so as to be within the above range. Here, as the alkali metal compound, the same compounds as described above, that is, potassium carbonate, sodium carbonate, sodium silicate, potassium chloride, sodium nitrate, potassium hydrogen carbonate, sodium perchlorate, potassium perchlorate, sodium phosphate, sodium sulfate And sodium hydrogen sulfate are exemplified as preferred.

If the fly ash, incinerated ash or soil contaminated with the chlorinated organic compound further contains an oxide or peroxide of an alkaline earth metal, the fly ash, incinerated ash or soil may contain: By adding at least one of water, an aqueous solution of an alkali metal compound, and aqueous hydrogen peroxide, fly ash, incinerated ash, or chlorinated organic compounds in soil can be decomposed.

As described above, fly ash, incinerated ash or soil to which the decomposition treating agent of the present invention has been added is, after adding water and other components as necessary, thoroughly mixed and left. After the addition and mixing, heat is generated, and the chlorinated organic compound is decomposed. When the alkaline earth metal oxide or peroxide is oil-coated, it may take about 130 minutes in about 5 minutes to 1 hour, depending on the conditions such as the coating amount, moisture and addition amount.
It generates heat at ℃ to 170 ° C and returns to normal temperature in about 1 hour to 3 days when exposed to outside air. If left unattended, use heat insulating material, etc.
Decomposition is promoted when the temperature is maintained for about one day. Further, if the evaporation of water is suppressed as much as possible and the temperature is kept at 80 ° C. to 95 ° C. for about one day by heating or the like, the decomposition is further promoted. In order to sufficiently decompose the chlorinated organic compound, it is better that the standing period is long, and usually it is preferably several hours to 7 days or more. When left unattended, there is water evaporation due to heat generation, and the amount of water decreases,
Usually, it is preferable not to add water. When left as such, fly ash, incinerated ash or chlorinated organic compounds in the soil are decomposed, so that fly ash, incinerated ash or soil that does not cause environmental pollution can be obtained and can be reused.

When the fly ash, incinerated ash or soil obtained by decomposing the chlorinated organic compound thus obtained is alkaline, it is often not appropriate to use it directly for landfilling. It is preferable to neutralize by adding to fly ash, incineration ash or soil. Examples of the acid used for neutralization include inorganic acids such as carbonated water and sulfuric acid, and organic acids such as citric acid.

[0027]

The agent for decomposing chlorinated organic compounds such as dioxins or PCB of the present invention is added to and mixed with fly ash, incinerated ash or soil contaminated with chlorinated organic compounds such as dioxins or PCB. This effectively decomposes chlorinated organic compounds such as dioxins and PCBs.
Therefore, the dioxins or P using the decomposition treatment agent for chlorinated organic compounds such as PCBs of the present invention.
By the method of treating chlorinated organic compounds such as CB, fly ash, incinerated ash or chlorinated organic compounds such as PCBs or dioxins contained in soil can be efficiently decomposed, and fly ash that does not cause environmental pollution , Incinerated ash or soil can be easily obtained. Also, if zeolite is included,
The effect of adsorbing harmful heavy metals such as Cd and Pb to zeolite and preventing them from being eluted outside is further exhibited.

[0028]

EXAMPLES Next, the present invention will be described with reference to examples, but these are exemplifications and do not limit the scope of the present invention in any way.

Example 1 1 g of commercially available corn oil is dissolved in 100 ml of hexane. This solution and 100 g of calcium oxide powder having an average particle size of 300 mesh are added to a rotary evaporator. The hexane solution of corn oil and the calcium oxide powder are heated and suctioned with stirring by a rotary evaporator to remove hexane. After sufficiently removing hexane, the obtained powder was taken out from the rotary evaporator to obtain a calcium oxide powder coated with corn oil.

Although a small amount of this calcium oxide powder was added to water, unlike calcium oxide powder not coated with oil, it did not immediately react with water and did not generate heat. An artificial zeolite (C) was added to 100 g of the oil-coated calcium oxide powder thus obtained.
5 g of a-type) and 10 g of potassium carbonate (reagent) were added and mixed well to obtain a decomposition agent for chlorinated organic compounds such as dioxins and PCB.

Example 2 1 g of a commercially available rapeseed oil is dissolved in 200 ml of hexane. This solution and 100 g of calcium oxide powder having an average particle size of 300 mesh are added to a rotary evaporator. The hexane solution of the rapeseed oil and the calcium oxide powder are heated and suctioned by a rotary evaporator while stirring to remove hexane. After sufficiently removing hexane, the obtained powder was taken out from the rotary evaporator to obtain a calcium oxide powder coated with rapeseed oil. A small amount of this calcium oxide powder was added to water, but unlike calcium oxide powder not coated with oil, it did not immediately react with water and did not generate heat. To 100 g of the oil-coated calcium oxide powder thus obtained, 5 g of artificial zeolite (Ca type) and 4 g of potassium carbonate (reagent) were added and mixed well to obtain an agent for decomposing chlorinated organic compounds.

Example 3 1 g of commercially available coconut oil is dissolved in 200 ml of hexane. This solution and 100 g of calcium oxide powder having an average particle size of 300 mesh are added to a rotary evaporator. The hexane solution of coconut oil and the calcium oxide powder are heated and suctioned by a rotary evaporator while stirring to remove hexane. After sufficiently removing hexane, the obtained powder was taken out from the rotary evaporator to obtain a coconut oil-coated calcium oxide powder. A small amount of this calcium oxide powder was added to water, but unlike calcium oxide powder not coated with oil, it did not immediately react with water and did not generate heat. Thus, a chlorinated organic compound decomposing agent was obtained.

Example 4 1 g of a commercially available rapeseed oil is dissolved in 200 ml of hexane. This solution and 75 g of calcium oxide powder having an average particle size of 300 mesh and 25 g of magnesium oxide powder are added to a rotary evaporator. A hexane solution of rapeseed oil and a mixed powder of calcium oxide and magnesium oxide are heated and suctioned by a rotary evaporator while stirring to remove hexane. After sufficiently removing hexane, the obtained powder was taken out from the rotary evaporator to obtain a mixed powder of calcium oxide and magnesium oxide coated with rapeseed oil. A small amount of this mixed powder of calcium oxide and magnesium oxide was added to water, but unlike the case where it was not coated with oil, it did not immediately react with water and did not generate heat. An artificial zeolite (Ca) was added to 100 g of the oil-coated calcium oxide powder thus obtained.
(Type) 5 g and potassium carbonate (reagent) 4 g were added and mixed well to obtain a chlorinated organic compound decomposing agent.

Example 5 To 100 g of commercially available calcium oxide powder having an average particle size of 300 mesh, 5 g of artificial zeolite (Ca type) was added and mixed well to obtain a chlorinated organic compound decomposing agent.

Example 6 25 g of the decomposition treatment agent obtained in Example 1 was incinerated from an incinerator (PCDD / DF and coplanar-PCB: 0.
(25 ng TEQ / g dry weight) and mixed well. Thereafter, the content of water with respect to the total solid content was 20%.
%, And the mixture was stirred again and allowed to stand at room temperature. After the mixture was left for one week after addition of the decomposition treatment agent, the results of measuring the amounts of dioxins and coplanar-PCB (PCDD / DF value) are shown below. After standing for 1 week: 0.041 ng per TEQ / g dry weight That is, after leaving for 1 week, dioxins and coplanar-PCB decreased to 16%.

Example 7 100 g of the decomposition treatment agent obtained in Example 2 was used as 100 g of fly ash (6.1 ng TEQ / g dry weight) from an incinerator.
And mixed well. 100 ml of water was added to the mixture, stirred again, and left at room temperature. After about 15 minutes,
The temperature rose to 110 ° C. Dioxins and coplanar after leaving for 1 week after mixing
The result of measuring the amount of PCB is shown below. After standing for one week: per 0.43 ng TEQ / g dry weight That is, after standing for one week, dioxins and coplanar-PCB were reduced to 7%.

Example 8 50 g of the decomposition treatment agent obtained in Example 3 was added to 100 g of fly ash (6.1 ng TEQ / g dry weight) from an incinerator and mixed well. 2 g of commercially available potassium carbonate was added to the mixture and further mixed well. 70 ml of water was added, stirred again, and left at room temperature. The results of measuring the amounts of dioxins and coplanar-PCB after one week of standing after the addition and mixing of the decomposition treatment agent are shown below. After standing for one week: 0.85 ng per TEQ / g dry weight That is, after standing for one week, dioxins and coplanar-PCB were reduced to 14%.

Example 9 100 g of the decomposition treatment agent obtained in Example 4 was added to 100 g of paddy soil (0.071 ng TEQ / g dry weight, water content 5%) and mixed well. 4 g of commercially available potassium carbonate was added to the mixture and further mixed well. Water 10
0 ml was added, stirred again, and left at room temperature. The results of measuring the amounts of dioxins and coplanar-PCB after one week of standing after the addition and mixing of the decomposition treatment agent are shown below. After standing for 1 week: 0.0013 ng per TEQ / g dry weight That is, after leaving for 1 week, dioxins and coplanar-PCB were reduced to 6%.

Example 10 75 g of the decomposition treating agent obtained in Example 3 and Example 3
25 g of oil-coated magnesium oxide prepared in the same manner as described above was used in paddy soil (0.019 ng TEQ /
(per 5 g dry weight, water content 5%) and mixed well. The mixture is mixed with 100% aqueous solution of 2% potassium carbonate.
Then, the mixture was sufficiently stirred, and allowed to stand at room temperature. The results of measuring the amounts of dioxins and coplanar-PCB after one week of standing after the addition and mixing of the decomposition treatment agent are shown below. After standing for 1 week: per 0.002 ng TEQ / g dry weight That is, after leaving for 1 week, dioxins and coplanar-PCB decreased to 10%.

Example 11 25 g of the decomposition treating agent obtained in Example 4 was used in paddy soil (0.071 ng TEQ / g dry weight, water content 10%).
And mixed well. 2% in the mixture
20 ml of an aqueous solution of potassium carbonate was added, and the mixture was sufficiently stirred and then left at room temperature. The results of measuring the amounts of dioxins and coplanar-PCB after one week of standing after the addition and mixing of the decomposition treatment agent are shown below. After leaving for 1 week: 0.034 ng per TEQ / g dry weight That is, after leaving for 1 week, dioxins and coplanar-PCB were reduced to 48%.

Example 12 20 g of the decomposition treating agent obtained in Example 5 was added to 20 g of fly ash (6.1 ng TEQ / g dry weight) from an incinerator and mixed well. Thereafter, 20 ml of water was added, mixed well, and left at room temperature. The results of measuring the amounts of dioxins and coplanar-PCB after one week of standing after the addition and mixing of the decomposition treatment agent are shown below. After standing for 1 week: 1.5 ng TEQ / g dry weight That is, after standing for 1 week, dioxins and coplanar-PCB were reduced to 25%.

Example 13 The fly ash used in Example 7 and the soil used in Example 9 were subjected to a leaching test of cadmium and lead in accordance with the leaching test method (this sample was taken as an untreated product). Further, in Example 7 and Example 9, the leaching test of cadmium and lead was similarly performed on fly ash and soil after standing for one week (this sample was treated). The results are shown below.

[0043]

[Table 1]

The elution amounts of cadmium and lead from the processed product were below the detection limit. That is, it became clear that the method for decomposing chlorinated organic compounds of the present invention can reduce not only chlorinated organic compounds but also fly ash and elution of cadmium and lead in soil.

Example 14 100 g of the oil-coated calcium oxide powder obtained in Example 1 and mixed with the artificial zeolite and potassium carbonate (reagent) before mixing was added to 100 g of fly ash, and a well-mixed mixture was added. I made one. Thereafter, 100 ml of a 2% aqueous potassium carbonate solution, 100 ml of a 2% aqueous sodium hydrogen sulfate solution, and 100 m of a 2% aqueous potassium perchlorate solution
l, 2% hydrogen peroxide solution 100 ml, 2% detergent water 100
ml of each was sprayed and added, stirred again and allowed to stand at room temperature. The dioxins and coplanar-PCB concentrations after 1 week of addition and mixing of the decomposition treating agent of the present invention were 9%, 11%, 11% and 7%, respectively, in toxic equivalents.
And 8%.

Example 15 100 g of oil-coated calcium oxide powder obtained before mixing with the artificial zeolite and potassium carbonate (reagent) obtained in Example 1 and 4 g of potassium carbonate (reagent) powder
g was added to 100 g of fly ash to make two well-mixed mixtures. Thereafter, 200 ml of a 50% aqueous isopropyl alcohol solution and 100 ml of a 10% aqueous ethylene glycol solution were respectively added by spraying, and the mixture was stirred again and allowed to stand at room temperature. Dioxins and Coplanar-P after leaving for 1 week after addition and mixing of the decomposition treating agent of the present invention
The concentration of CB was reduced to 12% and 11%, respectively, in toxic equivalents.

Example 16 p of the soil after the decomposition test obtained in the decomposition test of Example 11
H was 12.8. As a result of spraying water in which carbon dioxide gas was dissolved and water in which citric acid was dissolved,
The soil pH was 7.5 and 7.8, respectively.

Example 17 After the addition of water and stirring in Example 8, the temperature was maintained for 1 day, and then the apparatus was left indoors. Otherwise, the same tests as in Example 8 were performed. After standing for one week, dioxins and coplanar-PCB fell to 9%.

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Claims (21)

[Claims] 1. An agent for decomposing chlorinated organic compounds, which comprises an oxide or peroxide of an alkaline earth metal. 2. The agent for decomposing chlorinated organic compounds according to claim 1, wherein the surface of the alkaline earth metal oxide or peroxide is oil-coated. 3. The agent for decomposing chlorinated organic compounds according to claim 2, wherein the oil used for the oil coating is a vegetable oil. 4. The oil according to claim 2, wherein the amount of the oil used in the oil coating is 0.3 to 10% by weight based on the total amount of the alkaline earth metal oxide or peroxide. Decomposition agent for chlorinated organic compounds. 5. The oxide or peroxide of an alkaline earth metal is at least one selected from calcium oxide, magnesium oxide, calcium peroxide and magnesium peroxide.
The agent for decomposing chlorinated organic compounds according to any one of claims 1 to 4, characterized in that: 6. The agent for decomposing chlorinated organic compounds according to claim 1, further comprising an alkali metal compound. 7. The alkali metal compound is at least one selected from alkali metal carbonates, silicates, chlorides, sulfates, perchlorates, nitrates and phosphates. The agent for decomposing chlorinated organic compounds according to the above. 8. The method according to claim 6, wherein the content of the alkali metal compound is 0.1 to 30 parts by weight based on 100 parts by weight of the total amount of the alkaline earth metal oxide or peroxide. 7. The agent for decomposing chlorinated organic compounds according to 7. 9. The agent for decomposing chlorinated organic compounds according to claim 1, further comprising zeolite. 10. The chlorination according to claim 9, wherein the zeolite content is 1 to 50 parts by weight based on 100 parts by weight of the total amount of the alkaline earth metal oxide or peroxide. Decomposition agent for organic compounds. 11. A fly ash characterized in that a decomposition treatment agent containing an oxide or peroxide of an alkaline earth metal is added to and mixed with fly ash, incinerated ash or soil contaminated with chlorinated organic compounds. For decomposing incinerated ash or chlorinated organic compounds in soil. 12. The chlorination according to claim 11, wherein the surface of the alkaline earth metal oxide or peroxide is oil-coated, and the decomposition treatment agent further contains an alkali metal compound. Organic compound decomposition treatment method. 13. The method according to claim 11, wherein the alkaline earth metal oxide or peroxide is at least one selected from the group consisting of calcium oxide, magnesium oxide, calcium peroxide and magnesium peroxide. A method for decomposing a chlorinated organic compound according to the above. 14. The oxide or peroxide of an alkaline earth metal contains a mixture of calcium oxide and magnesium oxide, and the content of magnesium oxide is 10 to 50% by weight based on the decomposition treatment agent. The method for decomposing chlorinated organic compounds according to claim 11, wherein: 15. The alkali metal compound is at least one selected from alkali metal carbonates, silicates, chlorides, sulfates, perchlorates, nitrates and phosphates. 15. The method for decomposing a chlorinated organic compound according to any one of items 14 to 14. 16. The method for decomposing a chlorinated organic compound according to claim 12, wherein the decomposing agent further contains zeolite. 17. The chlorinated organic compound according to claim 11, wherein the amount of the decomposing agent added to and mixed with 100 parts by weight of fly ash, incinerated ash or soil is 5 to 200 parts by weight. Decomposition method. 18. After adding and mixing the decomposition treatment agent to fly ash, incineration ash or soil, at least water, an aqueous solution of an alkali metal compound, aqueous hydrogen peroxide, detergent water, or an aqueous solution of a monohydric or polyhydric alcohol. The method for decomposing chlorinated organic compounds according to claim 11, wherein one is added. 19. A decomposing agent is added to and mixed with fly ash, incinerated ash or soil, and optionally further mixed with water, an aqueous solution of an alkali metal compound, aqueous hydrogen peroxide, detergent water, or an aqueous solution of a monohydric or polyhydric alcohol. 19. The method for decomposing chlorinated organic compounds according to claim 11, wherein an initial amount of water in the mixture after adding at least one is 1 to 70% by weight based on the total solid content. . 20. The chlorine according to claim 11, wherein the decomposition treatment agent is added to fly ash, incineration ash or soil, mixed and decomposed, and then an acid is added to neutralize the treated product. For decomposing organic chemical compounds. 21. Fly ash containing an oxide or peroxide of an alkaline earth metal and contaminated with a chlorinated organic compound.
Fly ash, incineration ash or chlorine in soil, characterized by adding at least one of an aqueous solution of an alkali metal compound, aqueous hydrogen peroxide, detergent water, and an aqueous solution of a monohydric or polyhydric alcohol to incineration ash or soil. For decomposing organic chemical compounds.