JPH04312475A - Decomposition method for dioxin in incinerated ash - Google Patents
Decomposition method for dioxin in incinerated ashInfo
- Publication number
- JPH04312475A JPH04312475A JP3079790A JP7979091A JPH04312475A JP H04312475 A JPH04312475 A JP H04312475A JP 3079790 A JP3079790 A JP 3079790A JP 7979091 A JP7979091 A JP 7979091A JP H04312475 A JPH04312475 A JP H04312475A
- Authority
- JP
- Japan
- Prior art keywords
- dioxin
- methanol
- solvent
- solution
- ultraviolet rays
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims description 7
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 title abstract 6
- 238000000354 decomposition reaction Methods 0.000 title description 11
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 63
- KVGZZAHHUNAVKZ-UHFFFAOYSA-N 1,4-Dioxin Chemical compound O1C=COC=C1 KVGZZAHHUNAVKZ-UHFFFAOYSA-N 0.000 claims description 27
- 150000002013 dioxins Chemical class 0.000 claims description 11
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 239000002904 solvent Substances 0.000 abstract description 15
- 239000010881 fly ash Substances 0.000 abstract description 11
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 abstract description 9
- 239000002956 ash Substances 0.000 abstract description 9
- 239000000126 substance Substances 0.000 abstract description 6
- 230000005855 radiation Effects 0.000 abstract 2
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 150000004827 dibenzo-1,4-dioxins Chemical class 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 238000009877 rendering Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 231100000167 toxic agent Toxicity 0.000 description 2
- 239000003440 toxic substance Substances 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001784 detoxification Methods 0.000 description 1
- 150000004826 dibenzofurans Chemical class 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 238000006303 photolysis reaction Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
- Fire-Extinguishing Compositions (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は都市ゴミ又は産業廃棄物
の焼却炉灰中のダイオキシンの分解処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for decomposing dioxins in incinerator ash of municipal waste or industrial waste.
【０００２】0002
【従来の技術】ダイオキシンはポリ塩素化ジベンゾパラ
ダイオキシン及びポリ塩素化ジベンゾフランのことで、
都市ゴミ焼却場の焼却灰やフライアッシュの中から検出
され、史上最強の毒物と云われている。現時点では紫外
線による分解が新開発表されたが確たる無害化（分解）
法はない。[Prior Art] Dioxin refers to polychlorinated dibenzopara-dioxin and polychlorinated dibenzofuran.
It has been detected in the incineration ash and fly ash of municipal waste incinerators, and is said to be the most toxic substance in history. At present, decomposition by ultraviolet rays has been newly developed, but it is definitely harmless (decomposition).
There is no law.
【０００３】0003
（１）紫外線照射による場合には、焼き灰やフライアッ
シュ等の固体と共存するダイオキシンは、光の影となる
部分は光が当らないので分解されない。そのため、すべ
ての面を照射することは不可能で１００％に近いダイオ
キシンの無害化は困難である。(1) In the case of ultraviolet irradiation, dioxins that coexist with solids such as burnt ash and fly ash are not decomposed because the light does not hit the shadowed areas. Therefore, it is impossible to irradiate all surfaces and it is difficult to detoxify nearly 100% of dioxin.
【０００４】
（２）溶剤によりダイオキシンを抽出したところ、ダイ
オキシン以外のものも抽出され、抽出溶剤に着色があり
紫外線照射の防害をおこしたり、溶剤そのものの紫外線
による分解が認められ不都合がある。(2) When dioxins are extracted with a solvent, substances other than dioxin are also extracted, and the extraction solvent is colored and prevents damage from ultraviolet irradiation, and the solvent itself is decomposed by ultraviolet rays, which is disadvantageous.
【０００５】
（３）紫外線の発生源により無害化作用に差異があり、
光の利用率の悪い光源が認められ、実用化するには最良
の光源の選択が必要である。(3) There are differences in the detoxification effect depending on the source of ultraviolet rays,
Light sources with poor light utilization efficiency have been recognized, and it is necessary to select the best light source for practical use.
【０００６】本発明は上記技術水準に鑑み、ダイオキシ
ンの紫外線による無害化に不具合のないダイオキシンの
抽出溶媒を選択し、かつ有効な紫外線を選択して、焼却
灰中のダイオキシンを完全に無害化しうる方法を提供し
ようとするものである。In view of the above-mentioned state of the art, the present invention selects a dioxin extraction solvent that has no problem in rendering dioxin harmless by ultraviolet rays, and also selects effective ultraviolet rays to completely render dioxin in incineration ash harmless. It is intended to provide a method.
【０００７】[0007]
【課題を解決するための手段】本発明は焼却灰中のダイ
オキシンをメタノールで抽出し、該ダイオキシンメタノ
ール溶液に波長３１０ｎｍ近傍の紫外線を照射すること
を特徴とする焼却灰中のダイオキシンの分解方法である
。[Means for Solving the Problems] The present invention provides a method for decomposing dioxin in incinerated ash, which comprises extracting dioxin in incinerated ash with methanol, and irradiating the dioxin methanol solution with ultraviolet rays having a wavelength of around 310 nm. be.
【０００８】すなわち、本発明は下記の諸点を新規とす
るものである。
（１）紫外線照射時に影となる固体状の焼却灰から、影
を形成しないように溶液としてダイオキシンを抽出し、
この溶液に紫外線照射という簡単な操作でダイオキシン
をほゞ完全に分解させる点。That is, the present invention is novel in the following points. (1) Dioxins are extracted as a solution from the solid incineration ash that forms a shadow when irradiated with ultraviolet rays, so as not to form a shadow.
The point is that dioxins can be almost completely decomposed by simply irradiating this solution with ultraviolet light.
【０００９】
（２）ダイオキシン抽出の溶剤として、他の有機物を溶
解せず、また紫外線照射の妨害となる黒色化しないで、
かつ低沸点で回収エネルギを小とするような溶剤、すな
わちメタノールを選択した点。(2) As a solvent for dioxin extraction, it does not dissolve other organic substances and does not turn black, which would interfere with ultraviolet irradiation.
In addition, methanol was selected as a solvent with a low boiling point and low recovery energy.
【００１０】
（３）光効率の高い紫外線、すなわち、波長３１０ｎｍ
近傍の紫外線を選択した点。(3) Ultraviolet light with high optical efficiency, that is, wavelength 310 nm
A selected point of nearby ultraviolet light.
【００１１】[0011]
（１）メタノールを溶媒として、ダイオキシンを抽出し
、その溶液に紫外線照射することによりダイオキシンの
無害化を計る方法において、他の溶接に比較して副反応
としてのメタノールの分解がない。(1) In the method of extracting dioxin using methanol as a solvent and rendering the dioxin harmless by irradiating the solution with ultraviolet rays, there is no decomposition of methanol as a side reaction compared to other welding methods.
【００１２】
（２）メタノール溶液としてのダイオキシンの光分解反
応において、波長選定をしたため、極めて光の利用率が
高い。(2) In the photodecomposition reaction of dioxin as a methanol solution, the wavelength is selected, so the light utilization rate is extremely high.
【００１３】[0013]
【実施例】（比較例）都市ゴミ焼却炉の後部に設置して
ある電気集塵器にて捕集したフライアッシュを分析する
と、ポリ塩素化ジベンゾパラダイオキシン類として、約
２００ｎｇ／ｇ程度検出された。このフライアッシュ１
０ｋｇに対してダイオキシンの抽出溶剤（類似の構造し
た物質）としてフェノール１００ｋｇを用いて１００℃
にて繰り返し抽出した。フェノール溶液からフェノール
のみを蒸留し、１００ｎｇ／ｇのダイオキシン類の濃度
になるよう濃縮した（正確ではないが約１／５に減容）
。この時のダイオキシンのフェノール溶液は濃茶褐色に
なっていた。[Example] (Comparative example) When fly ash collected by an electrostatic precipitator installed at the rear of a municipal waste incinerator was analyzed, approximately 200 ng/g of polychlorinated dibenzoparadioxins was detected. Ta. This fly ash 1
100°C using 100kg of phenol as an extraction solvent (substance with similar structure) for dioxin
It was extracted repeatedly. Only phenol was distilled from the phenol solution and concentrated to a dioxins concentration of 100 ng/g (though not exactly, the volume was reduced to about 1/5).
. At this time, the dioxin phenol solution had a dark brown color.
【００１４】後述するダイオキシンの分解に有効な紫外
線を発光するＸｅ−Ｃｌレーザ（３０８ｎｍ）光（５Ｈ
ｚ×５ｍＪ）をフェノール中に濃縮されたダイオキシン
に１時間照射した。このダイオキシンのフェノール溶液
は黒色に近く、紫外光の吸収があること、ダイオキシン
以外の雑多な有機物をフライアッシュから抽出している
ことから、これも分解され紫外線消費に寄与し、しかも
定量的に分析していないが、溶剤であるフェノールもこ
のレーザーで分解されるため、ダイオキシンの分解率は
４０％であった。フェノールの分解はダイオキシンの分
解を妨害するのみならず、経済的にも許されない。Xe-Cl laser (308 nm) light (5H
z x 5 mJ) was irradiated for 1 hour to dioxins concentrated in phenol. This phenol solution of dioxin is close to black and absorbs ultraviolet light, and since miscellaneous organic substances other than dioxin are extracted from fly ash, this also decomposes and contributes to ultraviolet consumption, and can be quantitatively analyzed. However, since the solvent phenol was also decomposed by this laser, the decomposition rate of dioxin was 40%. Decomposition of phenol not only interferes with the decomposition of dioxin but is also economically unacceptable.
【００１５】（例１）比較例と同じ場所から採取したフ
ライアッシュ（ダイオキシン類の含有量２００ｎｇ／ｇ
）１０ｋｇをメタノール１００ｋｇ用い５０℃にて繰り
返し抽出した。このメタノール溶液から、メタノールの
みを蒸留して１００ｎｇ／ｇのダイオキシン濃度となる
よう濃縮した（約１／５に減容）。(Example 1) Fly ash collected from the same location as the comparative example (dioxin content 200 ng/g)
) was repeatedly extracted using 100 kg of methanol at 50°C. From this methanol solution, only methanol was distilled and concentrated to a dioxin concentration of 100 ng/g (reduced volume to about 1/5).
【００１６】このダイオキシンメタノール溶液はほとん
ど透明で着色もなく、また雑多な有機物をフライアッシ
ュから抽出していないため、比較例と同じＸｅ−Ｃｌ（
３０８ｎｍ）レーザ光の照射によりほとんどのダイオキ
シンは分解した。さらにこのＸｅ−Ｃｌレーザ光の照射
ではフェノールを溶剤とする場合と異なり、メタノール
の分解も認められなかった。This dioxin methanol solution is almost transparent and has no coloration, and since miscellaneous organic substances are not extracted from the fly ash, it is
Most of the dioxins were decomposed by irradiation with laser light (308 nm). Furthermore, unlike in the case of using phenol as a solvent, no decomposition of methanol was observed in the irradiation with this Xe-Cl laser beam.
【００１７】（例２）例１と同様のダイオキシンメタノ
ール溶液にＫｒ−Ｆのレーザ光（２４８ｎｍ）を同条件
で照射するとダイオキシンの７０％を分解した。またＡ
ｒ−Ｆのレーザ光（１９３ｎｍ）を照射すると５５％の
ダイオキシンの分解率が得られた。(Example 2) When the same dioxin methanol solution as in Example 1 was irradiated with Kr-F laser light (248 nm) under the same conditions, 70% of the dioxin was decomposed. Also A
When irradiated with r-F laser light (193 nm), a dioxin decomposition rate of 55% was obtained.
【００１８】以上の例により、紫外線の波長は３１０ｎ
ｍ近傍が最も効果的であることが判った。According to the above example, the wavelength of ultraviolet rays is 310 nm.
It was found that the vicinity of m is the most effective.
【００１９】[0019]
【発明の効果】フライアッシュに共存する有毒物である
ダイオキシンは有機溶剤で抽出し、紫外線照射をすると
簡単に分解する。有機溶剤を選択すれば光照射効率の増
大と同時に溶剤の紫外線による分解を避けることが可能
である。[Effects of the Invention] Dioxin, which is a toxic substance that coexists in fly ash, is extracted with an organic solvent and easily decomposed by irradiation with ultraviolet rays. By selecting an organic solvent, it is possible to increase the light irradiation efficiency and at the same time avoid decomposition of the solvent by ultraviolet rays.
【００２０】また紫外線の波長を選択すれば、すなわち
、ダイオキシンの場合には３００ｎｍ近傍を適用してさ
らに効果を向上させうる。そしてフライアッシュに直接
紫外線を照射した場合の光の影の部分がなくなるので、
効率が大きく向上し、溶剤の分解がないため、再度リサ
イクルして溶剤利用ができる。Further, the effect can be further improved by selecting the wavelength of the ultraviolet light, that is, in the case of dioxin, applying a wavelength around 300 nm. And since there are no shadows when the fly ash is directly irradiated with ultraviolet light,
Efficiency is greatly improved and since there is no decomposition of the solvent, the solvent can be recycled and used again.
Claims (1)
で抽出し、該ダイオキシンメタノール溶液に波長３１０
ｎｍ近傍の紫外線を照射することを特徴とする焼却灰中
のダイオキシンの分解方法。Claim 1: Dioxins in the incineration ash are extracted with methanol, and the dioxin methanol solution is injected with a wavelength of 310 nm.
A method for decomposing dioxins in incineration ash, which comprises irradiating ultraviolet light in the nanometer range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3079790A JPH04312475A (en) | 1991-04-12 | 1991-04-12 | Decomposition method for dioxin in incinerated ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3079790A JPH04312475A (en) | 1991-04-12 | 1991-04-12 | Decomposition method for dioxin in incinerated ash |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04312475A true JPH04312475A (en) | 1992-11-04 |
Family
ID=13700012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3079790A Withdrawn JPH04312475A (en) | 1991-04-12 | 1991-04-12 | Decomposition method for dioxin in incinerated ash |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04312475A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001087411A (en) * | 1999-09-24 | 2001-04-03 | Nishimatsu Constr Co Ltd | Dioxins decontaminating method and dioxins treatment device |
| CN117139347A (en) * | 2023-11-01 | 2023-12-01 | 北京市弘洁蓝天科技股份有限公司 | Dioxin removing method and device |
-
1991
- 1991-04-12 JP JP3079790A patent/JPH04312475A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001087411A (en) * | 1999-09-24 | 2001-04-03 | Nishimatsu Constr Co Ltd | Dioxins decontaminating method and dioxins treatment device |
| JP4550188B2 (en) * | 1999-09-24 | 2010-09-22 | 西松建設株式会社 | Dioxin decontamination method and dioxin treatment apparatus |
| CN117139347A (en) * | 2023-11-01 | 2023-12-01 | 北京市弘洁蓝天科技股份有限公司 | Dioxin removing method and device |
| CN117139347B (en) * | 2023-11-01 | 2024-02-27 | 北京市弘洁蓝天科技股份有限公司 | Dioxin removing method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980711 |