JPH03270777A - Treatment of fly ash containing toxic substance - Google Patents
Treatment of fly ash containing toxic substanceInfo
- Publication number
- JPH03270777A JPH03270777A JP2068581A JP6858190A JPH03270777A JP H03270777 A JPH03270777 A JP H03270777A JP 2068581 A JP2068581 A JP 2068581A JP 6858190 A JP6858190 A JP 6858190A JP H03270777 A JPH03270777 A JP H03270777A
- Authority
- JP
- Japan
- Prior art keywords
- fly ash
- ozone
- treatment
- water
- pcdfs
- 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.)
- Granted
Links
- 239000010881 fly ash Substances 0.000 title claims abstract description 38
- 231100000167 toxic agent Toxicity 0.000 title abstract 2
- 239000003440 toxic substance Substances 0.000 title abstract 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000725 suspension Substances 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 9
- 238000002604 ultrasonography Methods 0.000 claims description 2
- 238000000354 decomposition reaction Methods 0.000 abstract description 8
- 239000007788 liquid Substances 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 9
- 239000002956 ash Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 150000008422 chlorobenzenes Chemical class 0.000 description 1
- 238000001784 detoxification Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005829 trimerization reaction Methods 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
Landscapes
- Gasification And Melting Of Waste (AREA)
- Processing Of Solid Wastes (AREA)
- Fire-Extinguishing Compositions (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、ごみ焼却炉を始めとする各種の火炉から出
る排ガス中のフライアッシュの処理方法に関し、さらに
詳しくは、有害物質とりわけポリクロロジベンゾフラン
（以下ｒＰＣＤＦＳ」と略記する）およびポリクロロジ
ベンゾジオキシン（以下「ＰｃＤＤｓＪと略記する）を
含むフライアッシュの処理方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for treating fly ash contained in exhaust gas emitted from various types of furnaces including garbage incinerators, and more specifically relates to a method for treating fly ash contained in exhaust gas emitted from various types of furnaces including garbage incinerators. (hereinafter abbreviated as "rPCDFS") and polychlorodibenzodioxin (hereinafter abbreviated as "PcDDsJ").
［従来技術および発明の課題］
ごみ焼却炉排ガス中のフライアッシュには、３００℃前
後の温度域でクロルベンゼン化合物の三量化によって生
成したＰＣＤＦｓおよびＰＣＤＤｓが、僅かではあるが
含まれている。ＰＣＤＦ ｓおよびＰＣＤＤ≧はオゾン
処理によって分解させられることが報告されている（
Ｃｈｅ■ｏｓｐｈｅｒｅ、Ｖｏｌ、１８．Ｎｏ１１／９
．ｐ１８５７〜１８８３．１９８７）。[Prior Art and Problems of the Invention] Fly ash in waste incinerator exhaust gas contains a small amount of PCDFs and PCDDs produced by trimerization of chlorobenzene compounds in a temperature range of around 300°C. It has been reported that PCDFs and PCDD≧ are decomposed by ozone treatment (
Che■osphere, Vol. 18. No11/9
．． p1857-1883.1987).
しかし、このオゾン処理をごみ焼却フライアッシュ中の
ＰＣＤＦ ｓおよびＰＣＤＤｓの分解・無害化に適用す
るには、分解効率を上げるための工夫が必要である。す
なわち、オゾンをＰＣＤＦｓおよびＰＣＤＤｓに効果的
に作用させて分解効率を高めるには、予めフライアッシ
ュを水に懸濁させると共に、ＰＣＤＦｓおよびＰＣＤＤ
ｓをフライアッシュから分離させておく必要がある。However, in order to apply this ozone treatment to the decomposition and detoxification of PCDFs and PCDDs in waste incineration fly ash, it is necessary to devise ways to increase the decomposition efficiency. In other words, in order to make ozone effectively act on PCDFs and PCDDs and increase the decomposition efficiency, fly ash must be suspended in water in advance, and PCDFs and PCDDs must be suspended in water beforehand.
It is necessary to separate s from fly ash.
この発明は、上記の如き実情に鑑み、フライアッシュに
含まれるＰＣＤＦ ｓおよびＰＣＤＤＳをオゾン処理に
よって分解させるに当たり、予め所要の前処理を施して
おくことによってＰＣＤＦ ｓおよびＰＣＤＤｓの分解
効率を高める有害物質含有フライアッシュの処理方法を
提供することを目的とする。In view of the above-mentioned circumstances, this invention aims to improve the decomposition efficiency of PCDFs and PCDDs by performing necessary pretreatment in advance when decomposing PCDFs and PCDDS contained in fly ash by ozone treatment. An object of the present invention is to provide a method for processing fly ash contained therein.
［課題の解決手段］
この発明による有害物質含有フライアッシュの処理方法
は、上記目的の達成のために、フライアッシュに含まれ
る有害物質ＰＣＤＦｓおよびＰＣＤＤｓをオゾン処理に
よって分解させるに当たり、フライアッシュと水の混合
液を超音波で処理して、フライアッシュを水に懸濁させ
ると共に上記有害物質をフライアッシュから分離させて
おき、得られた懸濁液をオゾンと接触させて、上記有害
物質を分解させることを特徴とする。[Means for Solving the Problems] In order to achieve the above object, the method for treating fly ash containing harmful substances according to the present invention is based on the method of treating fly ash containing fly ash and water when decomposing the harmful substances PCDFs and PCDDs contained in the fly ash by ozone treatment. The mixed solution is treated with ultrasound to suspend the fly ash in water and separate the harmful substances from the fly ash, and the resulting suspension is brought into contact with ozone to decompose the harmful substances. It is characterized by
この発明において、上記混合物における水に対するフラ
イアッシュの割合は好ましくは１０〜３０重量％であり
、超音波の強度は好ましくは２８〜３８ＫＨｚであり、
懸濁液における水に対するオゾンの割合は好ましくは約
１５ｇ／ｋｇ・分であり、処理時間は好ましくは３０分
以上であり、処理温度は好ましくは室温以上である。In this invention, the ratio of fly ash to water in the mixture is preferably 10 to 30% by weight, the intensity of the ultrasonic wave is preferably 28 to 38 KHz,
The ratio of ozone to water in the suspension is preferably about 15 g/kg.min, the treatment time is preferably 30 minutes or more, and the treatment temperature is preferably room temperature or higher.
ポリクロロジベンゾフランＰＣＤＦ ｓおよびポリクロ
ロジベンゾジオキシン（ポリクロロジベンゾジオキサン
）ＰＣＤＤｓの処理に供されたオゾンのうちの過剰分は
、処理ゾーンから出た後分解される。また、処理済み懸
濁液は処理ゾーンから出た後固液分離され、得られた無
害化アッシュは廃棄され、回収した水は混合シンへ循環
され再使用に供される。The excess ozone subjected to the treatment of polychlorodibenzofuran PCDFs and polychlorodibenzodioxin (polychlorodibenzodioxane) PCDDs is decomposed after leaving the treatment zone. Further, the treated suspension is subjected to solid-liquid separation after leaving the treatment zone, the resulting detoxified ash is discarded, and the recovered water is circulated to the mixing sink for reuse.
［作 用コ
この発明の方法によれば、フライアッシュに含まれる有
害物質ＰＣＤＦｓおよびＰＣＤＤｓをオゾン処理によっ
て分解させるに当たり、フライアッシュと水の混合液を
超音波で処理して、フライアッシュを水に懸濁させると
共に上記有害物質をフライアッシュから分離させておき
、得られた懸濁液をオゾンと接触させて、上記有害物質
を分解させるので、オゾン処理によるＰＣＤＦ ｓおよ
びＰＣＤＤｓの分解効率が大幅に高められる。[Function] According to the method of this invention, in decomposing the harmful substances PCDFs and PCDDs contained in fly ash by ozone treatment, a mixture of fly ash and water is treated with ultrasonic waves, and the fly ash is mixed with water. The harmful substances are suspended and separated from the fly ash, and the resulting suspension is brought into contact with ozone to decompose the harmful substances, so the decomposition efficiency of PCDFs and PCDDs by ozone treatment is greatly improved. be enhanced.
［実 施 例］
つぎに、図示の実施例によりこの発明を具体的に説明す
る。[Example] Next, the present invention will be specifically explained with reference to the illustrated example.
添付の図面において、ごみ焼却炉から出る排ガス中のフ
ライアッシュは、撹拌機（１）を備えた混合槽（２）に
おいて水と混合され、得られた混合液は処理槽（３）へ
送られる。この混合物において水に対するフライアッシ
ュの割合は、２０重量％である。In the attached drawing, fly ash in the exhaust gas from a waste incinerator is mixed with water in a mixing tank (2) equipped with an agitator (1), and the resulting mixed liquid is sent to a treatment tank (3). . The proportion of fly ash to water in this mixture is 20% by weight.
この処理槽（３〉は底部に超音波発生器（４）を備える
と共に、同発生器（４）の上にガスデイストリビユータ
（５）を備えている。処理槽（３）中の混合液に超音波
発生器（４）で発生した超音波が与えるれる。この超音
波の強度は３２ＫＨｚである。その結果、フライアッシ
ュが水に懸濁させられると共にフライアッシュに付着し
ていたＰＣＤＦ ｓおよびＰＣＤＤｓがフライアッシュ
から分離させられる。This processing tank (3) is equipped with an ultrasonic generator (4) at the bottom and a gas distributor (5) above the generator (4).The mixed liquid in the processing tank (3) An ultrasonic wave generated by an ultrasonic generator (4) is applied to the ultrasonic generator (4).The intensity of this ultrasonic wave is 32 KHz.As a result, the fly ash is suspended in water and the PCDFs and PCDFs attached to the fly ash are suspended. PCDDs are separated from the fly ash.
この状態で、オゾン発生器（６〉において酸素ガスから
得られたオゾン含有ガスが同発生器（６〉から処理槽（
３〉のガスデイストリビユータ（５）に送られ、処理槽
（３）中の懸濁液にバブリングさせられる。この懸濁液
において水に対するオゾンの量は１５ ｇ／ｋ ｇ・分
であり、処理時間は約４０分であり、処理温度は約２５
℃である。こうして、懸濁液がオゾンと接触させられる
ことによってＰＣＤＦｓおよびＰＣＤＤｓが分解される
。In this state, ozone-containing gas obtained from oxygen gas in the ozone generator (6>) is transferred from the ozone generator (6>) to the treatment tank (
3> is sent to the gas distributor (5) and bubbled into the suspension in the processing tank (3). In this suspension, the amount of ozone relative to water was 15 g/kg/min, the treatment time was about 40 minutes, and the treatment temperature was about 25
It is ℃. Thus, PCDFs and PCDDs are decomposed by contacting the suspension with ozone.
オゾンの過剰分は処理槽（３〉の頂部から出て、脱湿器
（７）で除湿された後オゾン分解器〈８）で分解され、
分解ガスが系外へ放散される。なお、オゾンの過剰分は
、処理槽を多段タイプのものとして各段に順次通して有
効に利用することもできる。Excess ozone comes out from the top of the treatment tank (3), is dehumidified in a dehumidifier (7), and then decomposed in an ozone decomposer (8).
Decomposition gas is dissipated out of the system. Incidentally, the excess ozone can also be effectively utilized by making the treatment tank a multi-stage type and passing it through each stage in turn.
また、処理済み懸濁液は処理槽（３〉の底部から出て、
遠心分離機（９）で固成分離される。得られた脱水ケー
キは無害化アッシュとして埋立て地へ廃棄され、回収し
た水はポンプ（１０）によって混合槽（２）へ循環され
、ここで再使用される。In addition, the treated suspension comes out from the bottom of the treatment tank (3),
It is separated into solids by a centrifuge (9). The resulting dehydrated cake is disposed of as detoxified ash in a landfill, and the recovered water is circulated by a pump (10) to a mixing tank (2) where it is reused.
［発明の効果］
この発明の方法によれば、フライアッシュに含まれる有
害物質ＰＣＤＦｓおよびＰ ＣＤＤ ｓをオゾン処理に
よって分解させるに当たり、フライアッシュと水の混合
液を超音波で処理して、フライアッシュを水に懸濁させ
ると共に上記有害物質をフライアッシュから分離させて
おき、得られた懸濁液をオゾンと接触させて、上記有害
物質を分解させるので、オゾン処理によるＰＣＤＦ ｓ
およびＰＣＤＤｓの分解効率を大幅に高めることができ
、上記有害物質の無害化を効果的に達成することができ
る。[Effects of the Invention] According to the method of the present invention, when decomposing harmful substances PCDFs and PCDDs contained in fly ash by ozone treatment, a mixture of fly ash and water is treated with ultrasonic waves, and the fly ash is is suspended in water and the harmful substances are separated from the fly ash, and the resulting suspension is brought into contact with ozone to decompose the harmful substances.
Moreover, the decomposition efficiency of PCDDs can be greatly increased, and the above-mentioned harmful substances can be effectively rendered harmless.
図面はこの発明の実施例を示すフローシートである。
（１）・・撹拌機、（２）・・・混合槽、（３）・・・
処理槽、（４）・・・超音波発生器、（５）・・・ガス
デイストリビユータ、（６）・・・オゾン発生器、（７
〉・・・脱湿器、（８）・・・オゾン分解器、（９）・
・・遠心分離機、（１０）・・・ポンプ。
以 上The drawing is a flow sheet showing an embodiment of the invention. (1)... Stirrer, (2)... Mixing tank, (3)...
Processing tank, (4)... Ultrasonic generator, (5)... Gas distributor, (6)... Ozone generator, (7
〉・・・Dehumidifier, (8)・・・Ozone decomposer, (9)・
...Centrifuge, (10)...Pump. that's all
Claims (1)
フランおよびポリクロロジベンゾジオキシンをオゾン処
理によって分解させるに当たり、フライアッシュと水の
混合液を超音波で処理して、フライアッシュを水に懸濁
させると共に上記有害物質をフライアッシュから分離さ
せておき、得られた懸濁液をオゾンと接触させて、上記
有害物質を分解させることを特徴とする、有害物質を含
むフライアッシュの処理方法。To decompose the harmful substances polychlorodibenzofuran and polychlorodibenzodioxin contained in fly ash by ozone treatment, the mixture of fly ash and water is treated with ultrasound to suspend the fly ash in water and remove the above harmful substances. 1. A method for treating fly ash containing harmful substances, the method comprising separating fly ash from the fly ash and contacting the obtained suspension with ozone to decompose the harmful substances.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2068581A JPH0759315B2 (en) | 1990-03-19 | 1990-03-19 | Method for treating fly ash containing harmful substances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2068581A JPH0759315B2 (en) | 1990-03-19 | 1990-03-19 | Method for treating fly ash containing harmful substances |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03270777A true JPH03270777A (en) | 1991-12-02 |
| JPH0759315B2 JPH0759315B2 (en) | 1995-06-28 |
Family
ID=13377892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2068581A Expired - Lifetime JPH0759315B2 (en) | 1990-03-19 | 1990-03-19 | Method for treating fly ash containing harmful substances |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0759315B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998025704A1 (en) * | 1996-12-11 | 1998-06-18 | Earth Sciences Limited | Methods and apparatus for use in processing and treating particulate material |
| EP0952116A1 (en) * | 1998-04-20 | 1999-10-27 | Kubota Corporation | Process for decomposition and removal of dioxins contained in sludge |
| CN105665408A (en) * | 2014-09-19 | 2016-06-15 | 映诚股份有限公司 | Method for treating incineration fly ash containing harmful heavy metals |
-
1990
- 1990-03-19 JP JP2068581A patent/JPH0759315B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998025704A1 (en) * | 1996-12-11 | 1998-06-18 | Earth Sciences Limited | Methods and apparatus for use in processing and treating particulate material |
| GB2320245B (en) * | 1996-12-11 | 2000-11-08 | John Henry Watt | Methods and apparatus for use in processing and treating particulate material |
| EP0952116A1 (en) * | 1998-04-20 | 1999-10-27 | Kubota Corporation | Process for decomposition and removal of dioxins contained in sludge |
| CN105665408A (en) * | 2014-09-19 | 2016-06-15 | 映诚股份有限公司 | Method for treating incineration fly ash containing harmful heavy metals |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0759315B2 (en) | 1995-06-28 |
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