JP3422616B2 - Treatment of contaminated soil - Google Patents
Treatment of contaminated soilInfo
- Publication number
- JP3422616B2 JP3422616B2 JP02482796A JP2482796A JP3422616B2 JP 3422616 B2 JP3422616 B2 JP 3422616B2 JP 02482796 A JP02482796 A JP 02482796A JP 2482796 A JP2482796 A JP 2482796A JP 3422616 B2 JP3422616 B2 JP 3422616B2
- Authority
- JP
- Japan
- Prior art keywords
- contaminated soil
- soil
- thermal decomposition
- treatment
- contaminated
- 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.)
- Expired - Lifetime
Links
Landscapes
- Processing Of Solid Wastes (AREA)
- Fire-Extinguishing Compositions (AREA)
- Gasification And Melting Of Waste (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は汚染土壌無害化処理
装置に適用される汚染土壌の処理方法に関する。TECHNICAL FIELD The present invention relates to a method for treating contaminated soil, which is applied to a contaminated soil detoxification treatment apparatus.
【０００２】[0002]
【従来の技術】従来より、有機塩素系農薬やＰＣＢ（ポ
リ塩化ビフェニール）で汚染された土壌の処理が近年問
題になっているが、これら汚染土壌を加熱処理して無害
化しようとすると、ダイオキシン類などの微量有害物質
が発生しやすく、このため実質的には無害化処理が行わ
れず、僅かに汚染土壌を地中に埋設してその表面をコン
クリートで覆う等の対処的な処理しかされていないのが
実情である。2. Description of the Related Art Conventionally, the treatment of soil contaminated with organochlorine pesticides and PCB (polychlorinated biphenyl) has been a problem in recent years. Since trace amounts of harmful substances such as substances are easily generated, detoxification treatment is not practically performed, and only conservative treatment such as slightly embedding contaminated soil in the ground and covering the surface with concrete is performed. The reality is that there is none.
【０００３】[0003]
【発明が解決しようとする課題】有機塩素系農薬やＰＣ
Ｂで汚染された土壌を無害化するには、有機塩素系農薬
やＰＣＢが可燃成分であることから加熱分解する方法が
適法と考えられるが、通常の加熱・分解方法では、加熱
・分解過程でダイオキシン類の微量有害物資が発生しや
すく、かかる二次的汚染の問題があるために、前記無害
化処理の実用化が達成されない。そこで本発明は、ダイ
オキシン類の微量有害物質の発生等の二次的汚染が生じ
ることなく簡便な処理方法で有機塩素系農薬やＰＣＢで
汚染された土壌を無害化する処理方法を提供する。[Problems to be Solved by the Invention] Organochlorine pesticides and PC
In order to render the soil contaminated with B harmless, it is considered that the method of heat decomposition is an appropriate method because organochlorine pesticides and PCB are combustible components. Since a small amount of dioxins and harmful substances are likely to be generated and there is a problem of such secondary pollution, practical application of the detoxification treatment cannot be achieved. Therefore, the present invention provides a treatment method for detoxifying soil contaminated with organochlorine pesticides and PCBs by a simple treatment method without secondary pollution such as generation of trace harmful substances such as dioxins.
【０００４】[0004]
【課題を解決するための手段】本発明はかかる技術的課
題を達成するために、有機塩素系農薬やＰＣＢ（ポリ塩
化ビフェニール）で汚染された土壌や浚渫有スラッジ等
の有機塩素系化合物の汚染物質（以下汚染土壌等とい
う）にイオン化合物が含有された粉砕状若しくは液状の
可燃物、具体的には石炭や重油を予め添加した後、熱分
解炉において複数段の加熱処理、好ましくは熱分解処理
後、該熱分解処理により発生したガスをガス若しくは油
にて再燃焼を行う、複数段の加熱処理をすることによ
り、塩素やダイオキシン等の芳香族化合物の発生を実質
的に防止し無害化処理を行うことを要旨とするものであ
る。[Means for Solving the Problems] In order to achieve the above technical problems, the present invention contaminates organic chlorine compounds such as soil contaminated with organic chlorine pesticides and PCB (polychlorinated biphenyl) and dredged sludge. substance (hereinafter contaminated referred soil, etc.) to the grinding-like or combustibles liquid ion-compound is contained, after specifically the addition of coal and heavy oil in advance, the heat treatment of a plurality of stages in the pyrolysis furnace, preferably heat After the decomposition treatment, the gas generated by the thermal decomposition treatment is re-combusted with gas or oil. By performing multiple stages of heat treatment, the generation of aromatic compounds such as chlorine and dioxin is substantially prevented and harmless. The purpose is to carry out the conversion processing.
【０００５】即ち本発明は有機塩素系農薬やＰＣＢで汚
染された前記汚染土壌等を、ダイオキシン類の微量有害
物質が発生せずに無害化処理するため、イオウ化合物が
含有された粉砕した石炭又は重油を０．０１〜１０ｗｔ
％予め添加したのち、汚染土壌を熱分解炉において複数
段の加熱処理、具体的には一次燃焼後、ガス若しくは油
にて再燃焼を行うことにより、塩素やダイオキシン等の
芳香族化合物の発生を実質的に防止し無害化処理を行う
ものである。That is, according to the present invention, since the contaminated soil and the like contaminated with organochlorine pesticides and PCBs are detoxified without generation of trace harmful substances such as dioxins, sulfur compounds are used.
0.01~10wt pulverized coal or heavy oil which is contained
% After adding in advance, the contaminated soil is subjected to heat treatment in multiple stages in a pyrolysis furnace, specifically, after primary combustion, it is re-combusted with gas or oil to generate aromatic compounds such as chlorine and dioxin. It substantially prevents and performs detoxification treatment.
【０００６】[0006]
【発明の実施の形態】本発明を具体的に説明する。有機
塩素系農薬やＰＣＢを加熱するとダイオキシン類が発生
する。これは、有機塩素系農薬やＰＣＢが熱分解する過
程で、Ｃｌ2（塩素）や芳香族化合物（ベンゼン環をも
つ化合物）が発生し、これらが互いに反応してダイオキ
シン類を生成することによる。このため、熱分解する過
程で発生するＣｌ2（塩素）を抑制できればダイオキシ
ン類は生成しない。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described. Dioxins are generated when organochlorine pesticides and PCBs are heated. This is because Cl 2 (chlorine) and aromatic compounds (compounds having a benzene ring) are generated in the process of thermal decomposition of organochlorine pesticides and PCBs, and these react with each other to form dioxins. Therefore, if Cl 2 (chlorine) generated in the thermal decomposition process can be suppressed, dioxins are not generated.
【０００７】本発明は、例えば石炭や重油（Ａ重油）等
のイオウ（Ｓ）化合物若しくはイオウ化合物含有体を予
め汚染土壌に添加して混合した状態で、熱分解するとＣ
ｌ2がイオウ化合物と反応してＣｌ2が発生せず、この結
果ダイオキシン類はできなくなる。これはつぎの反応に
よって説明できる。
Ｈ2Ｓ＋Ｃｌ2＋Ｏ2→２ＨＣｌ＋ＳＯ2
すなわち、イオウ（Ｓ）化合物を含む石炭や重油の熱分
解において生成するＨ2Ｓが、有機塩素系農薬やＰＣＢ
の熱分解によって生ずるＣｌ2と反応してしまい、ダイ
オキシン類生成に寄与できなくなるからである。According to the present invention, when a sulfur (S) compound or a sulfur compound-containing body such as coal or heavy oil (A heavy oil) is added to a contaminated soil in advance and mixed, it undergoes C when pyrolyzed.
l 2 does not react with the sulfur compound to generate Cl 2 and as a result dioxins cannot be formed. This can be explained by the following reaction. H 2 S + Cl 2 + O 2 → 2HCl + SO 2 That is, H 2 S produced in the thermal decomposition of coal or heavy oil containing sulfur (S) compounds is an organochlorine pesticide or PCB.
This is because it reacts with Cl 2 generated by the thermal decomposition of and cannot contribute to the formation of dioxins.
【０００８】[0008]
【実施例】以下、図面を参照して本発明の好適な実施例
を例示的に詳しく説明する。但しこの実施例に記載され
ている構成部品若しくは材料の割合、種類、形状、相対
的配置等は特に特定的な記載がないかぎりは、この発明
の範囲をそれに限定する趣旨ではなく、単なる説明例に
すぎない。図１は、本発明の実施例に係る汚染土壌を処
理するための加熱処理炉を示し、図中Ｗ1は汚染土壌、
Ｗ2は粉砕した石炭又はＡ重油で、これらは汚染土壌Ｗ1
に粉砕した石炭又はＡ重油Ｗ2を添加混合したものを、
ホッパー１より熱分解炉２に石炭又はＡ重油と混合した
汚染土壌Ｗ3を投入して熱分解処理を行う。該熱分解処
理により発生するガスＧは、後方の再燃焼室３で燃焼処
理する。熱分解炉２を出た土壌Ｗ3’は、助燃バーナ４
で加熱されたのち、ストーカ５から排出される
（Ｗ4）。助燃バーナ４に供給される助燃料Ｗ5にはプロ
パンガス、都市ガス又は油等任意の燃焼ガスが用いられ
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be exemplarily described in detail below with reference to the drawings. However, unless otherwise specified, the proportions, types, shapes, relative positions, etc. of the components or materials described in this embodiment are not intended to limit the scope of the present invention, but merely illustrative examples. Nothing more. FIG. 1 shows a heat treatment furnace for treating contaminated soil according to an embodiment of the present invention, in which W 1 is the contaminated soil,
W 2 is crushed coal or heavy oil A, which are contaminated soil W 1
The crushed coal or A heavy oil W 2 added and mixed,
From the hopper 1, the contaminated soil W 3 mixed with coal or A heavy oil is put into the thermal decomposition furnace 2 to perform thermal decomposition treatment. The gas G generated by the thermal decomposition process is burnt in the rear reburning chamber 3. The soil W 3 'that has exited the pyrolysis furnace 2 is the burner burner 4
After being heated by, it is discharged from the stoker 5 (W 4 ). As the auxiliary fuel W 5 supplied to the auxiliary combustion burner 4, any combustion gas such as propane gas, city gas or oil is used.
【０００９】次に前記装置を用いて行った実施例及び比
較例を説明する。
（実施例１）ＰＣＢを０．０１ｗｔ％含有する汚染土壌
１００ｋｇに１００μに粉砕した石炭を０．５ｗｔ％添
加し混合したのち、熱分解炉２で８５０℃で３０分加熱
・分解した。排出した土壌を取り出し、溶出試験をした
結果、検液中にＰＣＢは検出されなかった（０．５μｇ
／リットル以下）。また再燃焼室３より排出された排気
中にはダイオキシン類は実質的に検出されなかった。
（０．０５ｎｇ（ナノグラム）−ＴＥＱ／μｍ3以下、
この値（０．０５ｎｇ）は分析出来る下限値であり、実
質的に検出されずと同意である。）Next, Examples and Comparative Examples conducted by using the above apparatus will be described. Example 1 0.5 wt% of coal pulverized to 100 μm was added to 100 kg of contaminated soil containing 0.01 wt% of PCB and mixed, and then the mixture was heated and decomposed in a thermal decomposition furnace 2 at 850 ° C. for 30 minutes. As a result of taking out the discharged soil and performing a dissolution test, PCB was not detected in the test solution (0.5 μg
/ Liter or less). Further, dioxins were not substantially detected in the exhaust gas discharged from the reburning chamber 3.
(0.05 ng (nanogram) -TEQ / μm 3 or less,
This value (0.05 ng) is the lower limit value that can be analyzed, and it is agreed that it is not substantially detected. )
【００１０】（実施例２）農薬クロルニトロフェン（Ｃ
ＮＰ）を０．００１ｗｔ％含有する汚染土壌１００ｋｇ
にＡ重油を０．１リットル、ｎ−ヘキサンに希釈したの
ち添加し混合した。その後熱分解炉２で８５０℃で３０
分加熱・分解した。排出した土壌を取り出し、溶出試験
をした結果、検液中に農薬は検出されなかった（０．０
５ｍｇ／リットル以下）。また、再燃焼室の排気中には
ダイオキシン類は検出されなかった（０．０５ｎｇ−Ｔ
ＥＱ／μｍ3以下）。Example 2 Agrochemical Chlornitrophen (C
100 kg of contaminated soil containing 0.001 wt% of NP)
0.1 liter of heavy oil A was diluted with n-hexane, and then added and mixed. After that, in the thermal decomposition furnace 2 at 850 ℃ 30
Heated for minutes and decomposed. As a result of taking out the discharged soil and performing a dissolution test, no pesticide was detected in the test solution (0.0
5 mg / liter or less). Dioxins were not detected in the exhaust gas from the reburning chamber (0.05 ng-T
EQ / μm 3 or less).
【００１１】（比較例１）ＰＣＢを０．０１ｗｔ％含有
する汚染土壌に石炭又はＡ重油を添加せず、熱分解炉２
で８５０℃、３０分加熱・分解した。排出した土壌から
はＰＣＢは溶出しなかったが、再燃焼室３より排出され
た排気中から１５ｎｇ−ＴＥＱ／μｍ3のダイオキシン
類が検出された。(Comparative Example 1) Pyrolysis furnace 2 was used without adding coal or heavy fuel oil A to contaminated soil containing 0.01 wt% of PCB.
It was heated and decomposed at 850 ° C. for 30 minutes. PCB was not eluted from the discharged soil, but 15 ng-TEQ / μm 3 dioxins were detected in the exhaust discharged from the reburning chamber 3.
【００１２】（比較例２）農薬クロルニトロフェン（Ｃ
ＮＰ）を０．００１ｗｔ％含有する汚染土壌に石炭又は
Ａ重油を添加せず、熱分解炉２で８５０℃、３０分加熱
・分解した。排出した土壌からはクロルニトロフェンは
溶出しなかったが、再燃焼室３より排出された排気中か
らは１０ｎｇ−ＴＥＱ／Ｎｍ3のダイオキシン類が検出
された。Comparative Example 2 Agrochemical Chlornitrophen (C
No coal or heavy oil A was added to the contaminated soil containing 0.001 wt% of NP), and it was heated and decomposed in the thermal decomposition furnace 2 at 850 ° C. for 30 minutes. Chlornitrophen was not eluted from the discharged soil, but 10 ng-TEQ / Nm 3 dioxins were detected in the exhaust gas discharged from the reburning chamber 3.
【００１３】[0013]
【発明の効果】本発明によれば、有機塩素系農薬やＰＣ
Ｂで汚染された土壌等をダイオキシン類の微量有害物質
の発生等の二次的汚染が生じることなく簡便な処理方法
で無害化処理する事ができる。According to the present invention, organochlorine pesticides and PC
The soil and the like contaminated with B can be detoxified by a simple treatment method without causing secondary pollution such as generation of trace harmful substances such as dioxins.
【図１】本発明の実施例に係る汚染土壌を処理するため
の加熱処理炉を示す。FIG. 1 shows a heat treatment furnace for treating contaminated soil according to an embodiment of the present invention.
Ｗ1 汚染土壌 Ｗ2 粉砕した石炭又はＡ重油 Ｗ3 熱分解中の土壌 Ｗ4 処理したあとの排出土壌 Ｗ5 助燃料（ガス又は油） １ ホッパー ２ 熱分解炉 ３ 再燃焼室 ４ 助燃バーナ ５ ストーカW 1 Contaminated soil W 2 Pulverized coal or heavy oil A W 3 Soil undergoing thermal decomposition W 4 Discharged soil after treatment W 5 Auxiliary fuel (gas or oil) 1 Hopper 2 Thermal decomposition furnace 3 Reburning chamber 4 Auxiliary burner 5 Stalker
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｆ２３Ｇ 5/027 ＺＡＢ (72)発明者 福島 寛 横浜市中区錦町12番地 三菱重工業株式 会社横浜製作所内 (72)発明者 奥野 敏 横浜市中区錦町12番地 三菱重工業株式 会社横浜製作所内 (56)参考文献 特開 平２−298717（ＪＰ，Ａ) 特開 昭61−82767（ＪＰ，Ａ)─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI F23G 5/027 ZAB (72) Inventor Hiroshi Fukushima 12 Nishikicho, Naka-ku, Yokohama-shi Mitsubishi Heavy Industries Ltd. Yokohama Works (72) Inventor Okuno Min. 12 Nishiki-cho, Naka-ku, Yokohama-shi, Mitsubishi Heavy Industries, Ltd. Yokohama Works (56) Reference JP-A-2-298717 (JP, A) JP-A-61-82767 (JP, A)
Claims (2)
ェニール）で汚染された土壌や浚渫有スラッジ（以下汚
染土壌という）をイオウ化合物が含有された粉砕状若し
くは液状の可燃物を予め添加した後、熱分解炉において
前記有機塩素系農薬やＰＣＢの熱分解処理を行い、該熱
分解処理により発生したガスを、ガス若しくは油にて再
燃焼を行うことを特徴とする汚染土壌の処理方法。1. A ground or liquid combustible substance containing a sulfur compound is added in advance to soil or dredged sludge (hereinafter referred to as contaminated soil) contaminated with organochlorine pesticides or PCB (polychlorinated biphenyl). A method for treating contaminated soil, which comprises subjecting the organochlorine pesticide and PCB to thermal decomposition in a thermal decomposition furnace, and re-combusting gas generated by the thermal decomposition with gas or oil.
た粉砕した石炭又は重油である請求項１記載の汚染土壌
の処理方法。2. The method for treating contaminated soil according to claim 1, wherein the combustible material is pulverized coal or heavy oil containing a sulfur compound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02482796A JP3422616B2 (en) | 1996-01-19 | 1996-01-19 | Treatment of contaminated soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02482796A JP3422616B2 (en) | 1996-01-19 | 1996-01-19 | Treatment of contaminated soil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09192641A JPH09192641A (en) | 1997-07-29 |
| JP3422616B2 true JP3422616B2 (en) | 2003-06-30 |
Family
ID=12149029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02482796A Expired - Lifetime JP3422616B2 (en) | 1996-01-19 | 1996-01-19 | Treatment of contaminated soil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3422616B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3395148B2 (en) | 1998-03-31 | 2003-04-07 | 株式会社豊栄商会 | Soil production method, soil treatment device, treatment method and treatment device |
| JP2003010671A (en) * | 2001-06-28 | 2003-01-14 | Mitsubishi Heavy Ind Ltd | Operation control system of hazardous substance treating apparatus |
| JP4969186B2 (en) * | 2006-09-14 | 2012-07-04 | Ｊｘ日鉱日石金属株式会社 | Industrial waste treatment method and industrial waste treatment facility |
| JP5379058B2 (en) * | 2010-03-29 | 2013-12-25 | 有限会社グリーニングラボラトリ | Hazardous substance processing apparatus and hazardous substance processing method |
-
1996
- 1996-01-19 JP JP02482796A patent/JP3422616B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09192641A (en) | 1997-07-29 |
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