[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

JP3935910B2 - Purification method and apparatus for contaminated soil - Google Patents

Purification method and apparatus for contaminated soil Download PDF

Info

Publication number
JP3935910B2
JP3935910B2 JP2005035310A JP2005035310A JP3935910B2 JP 3935910 B2 JP3935910 B2 JP 3935910B2 JP 2005035310 A JP2005035310 A JP 2005035310A JP 2005035310 A JP2005035310 A JP 2005035310A JP 3935910 B2 JP3935910 B2 JP 3935910B2
Authority
JP
Japan
Prior art keywords
solvent
soil
contaminated
tank
treatment
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 - Fee Related
Application number
JP2005035310A
Other languages
Japanese (ja)
Other versions
JP2005131641A (en
Inventor
徹 栄藤
直幸 上島
茂和 畑野
英夫 鈴木
侑亮 印南
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP2005035310A priority Critical patent/JP3935910B2/en
Publication of JP2005131641A publication Critical patent/JP2005131641A/en
Application granted granted Critical
Publication of JP3935910B2 publication Critical patent/JP3935910B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Landscapes

  • Processing Of Solid Wastes (AREA)

Description

本発明は、油、PCB及びダイオキシン類等の自然に分解できない有害物質により汚染された土壌を浄化して再利用する汚染土壌の浄化方法及びその装置に関する。   The present invention relates to a contaminated soil purification method and apparatus for purifying and reusing soil contaminated with harmful substances that cannot be decomposed naturally, such as oil, PCB, and dioxins.

近年、生活排水及び工場、事業場からの排水等の浸透による土壌汚染、また工場跡地等の土壌汚染等により本来自然に分解不可能な化学物質で汚染された土壌、地下水が増加し、その結果生態系や社会生活基盤としての土壌環境に深刻な影響を与えつつある。
このような汚染された土壌や地下水に対処していくために、様々な汚染物質に対応して、各種の処理方法が提案されている。
しかしながら、油、PCB及びダイオキシン等の油該物質に関しては有効な処理方法がなく、専ら焼却あるいは封じ込め等の対策が行われつつあるのが現状である。
In recent years, soil and groundwater contaminated with chemical substances that cannot be naturally decomposed due to soil contamination due to infiltration of domestic wastewater and wastewater from factories and business establishments, and soil contamination of factory sites, etc. have increased. The soil environment as an ecosystem and social life base is being seriously affected.
In order to deal with such contaminated soil and groundwater, various treatment methods have been proposed in response to various pollutants.
However, there are no effective treatment methods for oils, PCBs, dioxins, and other such oils, and the current situation is that measures such as incineration or containment are being implemented exclusively.

かかる従来の処理方法のうち一般的に広く用いられている焼却処理は、油、PCB及びダイオキシン等の各種有害物質に汚染された土壌をロータリキルン等の焼却設備により高温度雰囲気下で焼却処理し、該汚染土場に含まれる油、PCB及びダイオキシン等の有害物質を燃焼、分解し、浄化土壌として環境に戻す。一方、前記焼却設備から排出される油、PCB及びダイオキシン等が分解して無害化されたガスは、燃焼ガスと共に排ガスとして大気放出される。   Among such conventional treatment methods, the incineration treatment that is widely used generally involves incinerating soil contaminated with various harmful substances such as oil, PCB and dioxin in a high temperature atmosphere using an incinerator such as a rotary kiln. Then, the harmful substances such as oil, PCB and dioxin contained in the contaminated soil are burned and decomposed to return to the environment as purified soil. On the other hand, the oil, PCB, dioxin and the like discharged from the incineration equipment are decomposed and detoxified, and then released into the atmosphere together with the combustion gas as exhaust gas.

前記焼却処理に関しては、膨大な汚染土壌を処理するのに対してエネルギコストが大きく、また処理後の土壌の変質等により廃棄物扱となる可能性を含んでおり再利用し難い等の問題を有する。
一方、封じ込めは本質的に汚染土壌の浄化対策ではなく、単に自然界からの遮断という消極的な処理方法といえる。
上記状況及びより快適な自然環境に復元するために、経済的にも有利な油、PCB及びダイオキシン等の有害物質に汚染された土壌の浄化方法が切望されている。
Regarding the incineration treatment, there are problems such as high energy cost for treating a huge amount of contaminated soil and the possibility of being treated as waste due to alteration of the soil after treatment, etc. Have.
Containment, on the other hand, is not essentially a remedial measure for contaminated soil, but simply a passive treatment method that involves blocking from the natural world.
In order to restore the above situation and a more comfortable natural environment, there is an urgent need for a method for purifying soil contaminated with harmful substances such as oil, PCB and dioxin which is economically advantageous.

そこで、特許文献1に、油汚染土の浄化方法として、処分場を必用とすることがなく、油分が環境へ拡散しない処理を可能とした土壌浄化方法が開示されている。
かかる浄化方法は、図4に示すように、まず油汚染土に水溶性有機溶剤を添加(ステップ101)して混合攪拌(ステップ102)し、汚染土中の油分を抽出した後、固液分離(ステップ103)し、その液体状を引抜くことにより汚染土内の油分を有機溶剤に混合された状態で汚染土から分離除去する。固液分離で生じた液体状についてはこれを蒸留して有機溶剤を回収(ステップ104)し、該有機溶剤はステップ101で再利用する。そして、以上の工程を所望の回数だけ繰り返し行なう。
特開平11−5075号公報
Therefore, Patent Document 1 discloses a soil purification method that does not require a disposal site and enables a treatment in which oil does not diffuse into the environment as a method for purifying oil-contaminated soil.
In this purification method, as shown in FIG. 4, first, a water-soluble organic solvent is added to the oil-contaminated soil (step 101), mixed and stirred (step 102), the oil content in the contaminated soil is extracted, and then solid-liquid separation is performed. (Step 103), and by extracting the liquid, the oil in the contaminated soil is separated and removed from the contaminated soil in a state of being mixed with the organic solvent. The liquid produced by the solid-liquid separation is distilled to recover the organic solvent (step 104), and the organic solvent is reused in step 101. The above steps are repeated as many times as desired.
Japanese Patent Laid-Open No. 11-5075

上記浄化方法により、油分の含水率を著しく低下させ、さらに該処理を油分が通常の土壌に近い値になるまで繰り返し行うことで再利用が可能となるとともに、溶剤の再利用も実現できる。また、これにより廃棄処分場が不要になるという利点も挙げられる。
しかしながら、例えば、災害後の工場跡地の土壌浄化処理等に代表されるように、該処理には大量の土壌を処理しなければならない場合が多く、大量の土壌を短時間で処理できる浄化処理装置が求められている。また、油分のみならず、近年規制の厳しくなりつつある、PCBやダイオキシン類等の有機塩素系化合物等は汚染物質中に占める割合は小さいものの極めて有害なため回収率を非常に高く設定しなければならず、効率良く複数回の洗浄処理を施す必用が生じる。
By the purification method described above, the water content of the oil can be remarkably reduced, and the treatment can be repeated by repeating the treatment until the oil content is close to that of normal soil, and the solvent can also be reused. This also has the advantage of eliminating the need for a disposal site.
However, as represented by, for example, soil purification treatment of factory sites after a disaster, the treatment often requires processing a large amount of soil, and a purification processing apparatus that can process a large amount of soil in a short time Is required. In addition to the oil content, organic chlorine compounds such as PCBs and dioxins, which are becoming increasingly strict in recent years, are extremely harmful although they have a small proportion of pollutants, so the recovery rate must be set very high. In other words, it is necessary to efficiently perform a plurality of cleaning processes.

そこで、本発明はかかる課題を解決するために、大がかりな処理施設を設ける必用がなく、かつ運転経費を大幅に削減可能であるとともに、汚染物質の成分に適した溶剤を用いて大量の汚染土壌を高効率で以って洗浄可能な汚染土壌の浄化方法の提供を目的とする。 Therefore, the present invention eliminates the need to provide a large treatment facility in order to solve such a problem, and can greatly reduce the operating cost, and uses a solvent suitable for the component of the pollutant to produce a large amount of contaminated soil. is referred to as object of the present invention to provide a purification how of washable contaminated soil me more than a high efficiency.

本発明はかかる課題を解決するために、前提技術として、油、PCB又はダイオキシン類等の有害物質で汚染された土壌を洗浄する方法において、
前記汚染土壌を溶剤にて洗浄する1又は複数の本洗浄工程と、その上流側に該土壌を溶剤にて洗浄する1つの粗洗浄工程とを設け、
該粗洗浄工程に前記本洗浄工程で汚染された溶剤を導入して汚染土壌に予備洗浄を施す技術を提案した。
In order to solve this problem, the present invention provides, as a prerequisite technology, a method for washing soil contaminated with harmful substances such as oil, PCB or dioxins,
Providing one or more main washing steps for washing the contaminated soil with a solvent, and one rough washing step for washing the soil with a solvent upstream thereof;
A technique for preliminarily washing contaminated soil by introducing the solvent contaminated in the main washing step into the rough washing step was proposed.

かかる前提技術によれば、最初に粗洗浄工程にて汚染土壌に予備洗浄を施すことで、油分等の該土壌の汚染成分のうち高比率を占める有害物質を低減し、その下流側に設けられた本洗浄工程にて残りの油分や、PCB、ダイオキシン類等を完全に除去できるようになっている。前記本洗浄工程は、その汚染度合いに適した工程数を有しており、さらに目的に応じた溶剤を用いるようにすることで、汚染土壌中の各種の有害物質を除去し、土壌の環境への埋め戻しが可能となる。
また、かかる土壌浄化方法は、粗洗浄工程を含めて複数の洗浄工程とを組合わせてなるため、処理設備を大型化することなく大量の汚染土壌の処理を効率良く行うことができる。
According to such a prerequisite technology, by first preliminarily washing the contaminated soil in the rough washing step, harmful substances occupying a high proportion of the contaminated components of the soil such as oil are reduced, and are provided on the downstream side thereof. In addition, the remaining oil, PCB, dioxins and the like can be completely removed in the main cleaning step. The main cleaning step has a number of steps suitable for the degree of contamination, and by using a solvent according to the purpose, various harmful substances in the contaminated soil are removed and the soil environment is restored. Can be backfilled.
Moreover, since this soil purification method combines several washing | cleaning processes including a rough washing process, it can process a lot of contaminated soil efficiently, without enlarging processing equipment.

また、前提技術の浄化方法は、前記本洗浄工程を経た土壌から蒸気により付着した溶剤を除去する溶剤脱着工程と、前記有害物質を含む該溶剤を精製して再び本洗浄工程の下流側に導入する溶剤精製工程とを備え、さらに、前記粗洗浄工程から排出される溶剤を固液分離する固液分離工程を備えるとともに、該分離された土壌を前記溶剤脱着工程に、溶剤を前記溶剤精製工程に夫々導入することを特徴とする。
これにより、前記本洗浄工程で使用した溶剤を粗洗浄工程にて再利用することで、溶剤の無駄を省くことができ、該溶剤の精製にかかる運転コストも大幅に削減することができる。また、汚染物質を濃縮して大幅な減容化が可能となる。
In addition, the purification method of the base technology includes a solvent desorption process for removing the solvent adhering to the soil from the soil that has undergone the main cleaning process, and purification of the solvent containing the harmful substances and introducing it again downstream of the main cleaning process. And further comprising a solid-liquid separation step for solid-liquid separation of the solvent discharged from the rough washing step, the separated soil in the solvent desorption step, and a solvent in the solvent purification step. It is characterized by being introduced respectively.
As a result, by reusing the solvent used in the main cleaning step in the rough cleaning step, it is possible to eliminate the waste of the solvent and to greatly reduce the operating cost for refining the solvent. In addition, it is possible to reduce the volume by concentrating pollutants.

そして本発明は、油、PCB又はダイオキシン類等の有害物質で汚染された土壌を浸漬洗浄する方法において、
染土壌ラインと前記複数の処理槽が接続される第1のバルブ群と、前記複数の夫々の処理槽と後記する溶剤精製設備間が夫々第2のバルブ群を介して接続されるとともに、溶剤を回収するための蒸気を夫々の処理槽に供給する蒸気接続ラインを第3のバルブ群を介して設けるとともに、
前記夫々の処理槽より回収される有害汚染物質を含んだ溶剤を蒸発させ、該蒸発させた溶剤蒸気を凝縮させて前記溶剤の精製を行う溶剤精製設備を前記複数の処理槽より少数を設けてなる土壌浄化装置にあって、
前記夫々の処理槽の処理段階を異ならせて、
前記第1バルブ群の開閉操作により夫々の処理槽へ汚染土壌が順次投入され溶剤にて洗浄処理を行う洗浄工程と、夫々の処理槽に蒸気を供給する蒸気接続ラインの第3のバルブ群の開閉操作により、前記該洗浄工程により有害物質で汚染された溶剤を蒸気回収する溶剤脱着工程と、前記第2バルブ群の開閉操作により対応する処理槽より回収された溶剤を精製して再利用する溶剤精製工程とが併行して行われるようにし
前記溶剤精製工程は、
前記土壌の洗浄を経て回収された溶剤のうちの有害物質を含む液体状の溶剤を溶剤蒸気から分離する気液分離工程と、
さらに前記液体状溶剤から土壌等の固体分を除去する固液分離工程と、
前記固体分が除去された液体状溶剤のうち溶剤と汚染物質とを蒸気により分離する蒸発工程と、からなることを特徴とする汚染土壌の浄化方法を提案する
And the present invention is a method for immersing and cleaning soil contaminated with harmful substances such as oil, PCB or dioxins,
A first valve group which contaminated soil line and said plurality of processing tanks is connected, together with the inter-solvent refining equipment is connected via a respective second group of valves to the treatment tank and below the plurality of respective, with steam connection line for supplying steam to the process vessel each for collecting SOLVENTS provided via a third valve group,
Evaporating the solvent containing harmful contaminants recovered from the treatment vessel of said respective, provided fewer than the solvent refining facilities said plurality of processing tanks for performing purification of the solvent by condensing the solvent vapor obtained by the evaporation In the soil purification device
Different processing stages of the respective processing tanks,
A cleaning process in which contaminated soil is sequentially introduced into each processing tank by opening and closing the first valve group and cleaning is performed with a solvent, and a third valve group of a steam connection line for supplying steam to each processing tank A solvent desorption process for recovering vapor of the solvent contaminated with harmful substances by the cleaning process by the opening / closing operation and a solvent recovered from the corresponding processing tank by the opening / closing operation of the second valve group are purified and reused. So that the solvent refining process is performed in parallel .
The solvent purification step includes
A gas-liquid separation step of separating a liquid solvent containing harmful substances out of the solvent recovered through washing of the soil from the solvent vapor;
Furthermore, a solid-liquid separation process for removing solids such as soil from the liquid solvent,
The present invention proposes a method for purifying contaminated soil, comprising an evaporation step of separating a solvent and a pollutant by a vapor from the liquid solvent from which the solid content has been removed .

また、本発明は、前記処理段階が、前記洗浄工程、溶剤脱着工程、溶剤精製工程の3段階からなるのが好ましい。
更に本発明は、前記溶剤精製工程が、対応する処理段階の処理槽に選択的に接続されるのが好ましい。
さらにまた、最終段階として土壌を再利用する前に乾燥させる乾燥工程を設けてもよく、かかる工程を前記処理段階に含むことにより、一貫した設備を提供することができる。
これらの発明により、前記と同様の効果を得られるとともに、一連の処理操作をバッチ処理にて行なう複数の処理槽に対して、複数の処理槽より少数の溶剤精製工程等を設けて夫々の処理槽の処理段階を異ならせて行うことで、該溶剤精製設備、蒸気及び空気供給設備を有効利用でき、かつ処理システムの設置面積を大幅に低減することができる。
また、必要に応じて前記処理槽の処理段階を選択することにより、被処理物である汚染土壌の性質、容量に応じた適切な処理が施せる。
In the present invention, it is preferable that the treatment step includes three steps of the washing step, the solvent desorption step, and the solvent purification step .
Furthermore, in the present invention, it is preferable that the solvent purification step is selectively connected to a treatment tank at a corresponding treatment stage .
Furthermore, a drying process for drying the soil before reuse as a final stage may be provided. By including such a process in the treatment stage, a consistent facility can be provided.
By these inventions, the same effects as described above can be obtained, and a plurality of processing tanks that perform a series of processing operations by batch processing are provided with a smaller number of solvent purification steps than the plurality of processing tanks. By performing the processing steps of the tanks differently, the solvent refining equipment, steam and air supply equipment can be used effectively, and the installation area of the processing system can be greatly reduced.
Moreover, by selecting the treatment stage of the treatment tank as necessary, it is possible to perform an appropriate treatment according to the nature and capacity of the contaminated soil that is the object to be treated.

また、前記溶剤精製工程は、前記有害汚染物質を含んだ溶剤を気液分離し、該分離された液体状の溶剤をさらに固液分離して土壌残留分が分離された液体状の溶剤を蒸発させ、前記気液分離及び蒸発により回収される溶剤蒸気を凝縮させて前記溶剤の精製を行う溶剤精製工程であるのがよい
これにより、溶剤中の汚染物質を濃縮して取り出すことができ、さらに該溶剤を高効率で以って再利用できるため、前記汚染物質の第2次処理操作の負担が軽減するとともに、溶剤の循環利用が可能となる。
In the solvent purification step, the solvent containing the harmful pollutant is gas-liquid separated, and the separated liquid solvent is further solid-liquid separated to evaporate the liquid solvent from which the soil residue is separated. are allowed, it is preferable is a solvent purification step for purifying the solvent to condense solvent vapor is recovered by the gas-liquid separator and evaporated.
As a result, the pollutant in the solvent can be concentrated and removed, and the solvent can be reused with high efficiency. Recycling is possible.

削除 Delete

更に、本発明は、前記土壌を溶剤にて洗浄する本洗浄処理槽と、該本洗浄処理槽の上流側に設けられ該土壌を溶剤にて洗浄する粗洗浄処理槽とを備え、前記本洗浄処理槽で汚染された溶剤を前記粗洗浄処理槽に導入することも有効である。
このように、1つ又は処理槽より少数の溶剤精製手段、蒸気供給手段及び土壌の乾燥に利用する空気供給手段等が複数の処理槽と時間差をもって接続されることにより、前記手段の設備類が有効に利用される。
The present invention further includes a main cleaning treatment tank for washing the soil with a solvent, and a rough washing treatment tank provided on the upstream side of the main washing treatment tank for washing the soil with a solvent. It is also effective to introduce the solvent contaminated in the treatment tank into the rough washing treatment tank.
In this way, the equipment of the means can be obtained by connecting a plurality of processing tanks with a time difference with one or a few processing tanks, such as solvent purification means, steam supply means, and air supply means used for drying the soil. It is used effectively.

削除 Delete

以上記載のごとく、本発明によれば、複数の処理槽を連接して設け夫々の処理槽で時間差を持って一連の操作をバッチ処理することで、被処理物質である汚染土壌の性質、容量に応じた適切な処理が可能になり、このように複数の処理槽と溶剤精製手段との接続ラインに夫々バルブを設けて、該バルブを時間差を持って開閉操作することにより、該溶剤精製設備、蒸気及び空気供給設備等を有効利用できるとともに、設置面積を低減することができる。
これらの処理システムにより従来の焼却処理に比べて大幅な運転コストの削減が可能となる。
また、複数の洗浄処理槽を直列に連接して設け、汚染成分に適した溶剤を下流側から投入することにより、被処理物である土壌の汚染度合い、その量に応じた適切な処理が可能となるとともに、多量の被処理土壌にも効率良く浄化処理が施せる。
さらに、本発明における溶剤精製設備を設けることで、溶剤を循環利用することができ、更なる運転コストの削減ができるとともに、該溶剤に含まれる有害物質を濃縮し大幅な容量の低減が可能となる。
As described above, according to the present invention, a plurality of treatment tanks are connected to each other, and a series of operations are batch-treated with a time difference in each treatment tank, so that the nature and capacity of the contaminated soil that is the material to be treated. In this way, by providing a valve in each connection line between the plurality of treatment tanks and the solvent purification means, and opening and closing the valve with a time difference, the solvent purification equipment In addition, the steam and air supply facilities can be used effectively, and the installation area can be reduced.
These processing systems can greatly reduce the operating cost compared to conventional incineration processing.
In addition, multiple cleaning treatment tanks are connected in series, and by introducing a solvent suitable for contaminated components from the downstream side, appropriate treatment according to the degree of contamination and the amount of soil to be treated is possible. In addition, a large amount of soil to be treated can be efficiently purified.
Furthermore, by providing the solvent refining equipment in the present invention, the solvent can be recycled and the operation cost can be further reduced, and the harmful substances contained in the solvent can be concentrated to greatly reduce the capacity. Become.

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の寸法、材質、形状、その相対的配置等は特に特定的な記載がない限りは、この発明の範囲をそれに限定する趣旨ではなく、単なる説明例に過ぎない。
図1は本発明の参考形態に係る土壌浄化システムの全体概略構成図、図2は実施形態に係る土壌浄化システムの全体概略構成図で、図3は本発明の実施形態に係る溶剤精製設備の概略構成図を示す。
(参考例)
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.
1 is an overall schematic configuration diagram of a soil purification system according to a reference embodiment of the present invention, FIG. 2 is an overall schematic configuration diagram of a soil purification system according to an embodiment, and FIG. 3 is a diagram of a solvent purification facility according to an embodiment of the present invention. A schematic block diagram is shown.
(Reference example)

図1に示す本発明の前提技術は1つの粗洗浄処理槽15と1又は複数の本洗浄処理槽16を直列に配設した洗浄工程を有するシステムで、まず、油、PCB、ダイオキシン等の有害物質を含む汚染土壌1を前記粗洗浄処理槽15にて溶剤3と混合撹拌して洗浄し、該土壌に付着した前記有害物質、特に汚染成分の高比率を占める、例えば油等の汚染物質の大部分をこの予備洗浄により分離し、固液分離器18に送給する。
一方、前記粗洗浄処理槽15にて予備洗浄された土壌2は1又は複数設けられた本洗浄処理槽16に導かれ、該本洗浄処理槽16の上流側に位置する槽から順に溶剤と浸漬撹拌により洗浄されながら下流側へと導かれ、該土壌4は溶剤脱着槽17へと送給される。
尚、前記本洗浄処理槽16は汚染土壌の汚染度合いやその量により適した段数が設けられており、前記溶剤脱着槽17へ導入される土壌4に含まれる汚染物質が通常の土壌とほぼ変わらない値にまで洗浄されるように構成される。
The prerequisite technology of the present invention shown in FIG. 1 is a system having a cleaning process in which one rough cleaning tank 15 and one or a plurality of main cleaning tanks 16 are arranged in series. First, harmful substances such as oil, PCB, dioxin, etc. Contaminated soil 1 containing substances is washed by mixing and stirring with the solvent 3 in the rough washing treatment tank 15, and the harmful substances adhering to the soil, in particular, pollutants such as oil, which occupy a high proportion of contaminating components. Most of the water is separated by this preliminary washing and fed to the solid-liquid separator 18.
On the other hand, the soil 2 preliminarily washed in the rough washing tank 15 is guided to one or a plurality of main washing tanks 16 and is immersed in a solvent in order from the tank located upstream of the main washing tank 16. The soil 4 is guided to the downstream side while being washed by stirring, and the soil 4 is fed to the solvent desorption tank 17.
The main cleaning tank 16 is provided with a suitable number of stages depending on the degree of contamination of the contaminated soil and the amount thereof, and the contaminants contained in the soil 4 introduced into the solvent desorption tank 17 are almost the same as ordinary soil. Configured to be washed to no value.

前記溶剤脱着槽17には、上記したように本洗浄処理槽16から導入される洗浄処理を施された土壌と、前記固液分離器18で溶剤6と分離された分離土壌7が導かれ、該溶剤脱着槽17にて蒸気10の吹き付けにより土壌に含まれる溶剤を蒸留させて回収し、溶剤の完全除去及び必要に応じて土壌の乾燥を行う。かかる一連の処理により浄化された浄化土壌9は環境へと戻され、再利用等される。
かかる実施形態の洗浄工程に使用する溶剤は、有機溶剤等の汚染成分に適した溶剤を用い、除去すべき有害物質が複数である場合には該汚染成分に適した溶剤を適当量混合した混合溶剤を使用するとよい。
The solvent desorption tank 17 is guided with the soil subjected to the cleaning treatment introduced from the main cleaning tank 16 as described above and the separated soil 7 separated from the solvent 6 with the solid-liquid separator 18. In the solvent desorption tank 17, the solvent contained in the soil is distilled and recovered by spraying the steam 10, and the solvent is completely removed and the soil is dried as necessary. The purified soil 9 purified by such a series of treatments is returned to the environment and reused.
As the solvent used in the cleaning process of this embodiment, a solvent suitable for a contaminating component such as an organic solvent is used, and when there are a plurality of harmful substances to be removed, a suitable amount of a solvent suitable for the contaminating component is mixed. A solvent may be used.

このように、複数の洗浄処理槽を直列に連接して設け、汚染成分に適した溶剤を下流側から投入することにより、被処理物である土壌の汚染度合い、その量に応じた適切な処理が可能となるとともに、多量の被処理土壌にも効率良く浄化処理が施せる。また、従来の焼却処理と比較して運転コストを約60%削減することができ、大幅なコストダウンが期待できる。
(実施例)
In this way, a plurality of cleaning treatment tanks are connected in series, and by introducing a solvent suitable for the contaminated component from the downstream side, an appropriate treatment according to the degree of contamination of the soil to be treated and its amount In addition, a large amount of treated soil can be efficiently purified. In addition, the operating cost can be reduced by about 60% compared to the conventional incineration process, and a significant cost reduction can be expected.
(Example)

次に、図2に示す本発明の実施形態について説明する。
油、PCB、ダイオキシン等の有害物質を含む汚染土壌は、第1処理槽20、第2処理槽21、第3処理槽22へ順次投入され段階的に洗浄を行う土壌浄化経路にて粗洗浄から本洗浄を行って洗浄処理を施される。かかる処理槽は汚染土壌の容量、性質に応じて適した型式、槽数が任意に選定され、また使用する溶剤も適宜選定される。
かかる実施形態は夫々の処理槽で一連の処理を行うバッチ処理であるため、第1、第2、第3の処理槽にて段階的に洗浄を行う処理を施すため、ここでは第2処理槽21を例に取り浄化システムのフローを説明する。
Next, an embodiment of the present invention shown in FIG. 2 will be described.
Contaminated soil containing toxic substances such as oil, PCB, dioxin, etc. is put into the first treatment tank 20, the second treatment tank 21, and the third treatment tank 22 in order and is washed from the rough washing through the soil purification path that performs washing step by step. A cleaning process is performed by performing the main cleaning. The type of tank and the number of tanks are arbitrarily selected according to the capacity and properties of the contaminated soil, and the solvent to be used is also appropriately selected.
Since this embodiment is a batch process in which a series of processes are performed in the respective processing tanks, the second processing tank is used here in order to perform a process of performing cleaning in stages in the first, second, and third processing tanks. The flow of the purification system will be described taking 21 as an example.

前記洗浄等の処理を施す第1処理槽20から第2処理槽21に投入された汚染土壌1は、まず溶剤供給槽23から供給される溶剤と浸漬して洗浄され、該土壌1に含まれる有害物質が分離される。そして油、PCB、ダイオキシン等の該有害物質を含む洗浄溶剤は後述する溶剤精製設備19にて汚染物質12と分離され、精製された溶剤は溶剤供給槽23に貯留されて前記処理槽に返送されて再利用される。
かかる汚染土壌の洗浄処理は、その洗浄回数、洗浄時間等を目的に応じて任意に選定する。
The contaminated soil 1 put into the second treatment tank 21 from the first treatment tank 20 for performing the treatment such as the washing is first immersed and washed with the solvent supplied from the solvent supply tank 23 and is contained in the soil 1. Hazardous substances are separated. The cleaning solvent containing the harmful substances such as oil, PCB, dioxin and the like is separated from the pollutant 12 by the solvent refining equipment 19 described later, and the purified solvent is stored in the solvent supply tank 23 and returned to the processing tank. And reused.
The washing treatment of the contaminated soil is arbitrarily selected according to the purpose, such as the number of washing times and the washing time.

次に、十分な洗浄処理が施された土壌は、蒸気10にて溶剤の完全除去、及び水分除去等を行われる。そして、洗浄に使用され有害物質及び蒸気を含んだ溶剤は後述する溶剤精製設備19にて、該有害物質と液体状の溶剤とに分離され、該精製された溶剤は前記処理槽20、21、22に返送される。
さらに、必要に応じて空気10にて乾燥処理が施すとよい。
上記した一連の操作により浄化された浄化土壌は前記第2処理槽21から取り出され、環境へと戻され、再利用等される。
Next, the soil that has been sufficiently washed is subjected to complete removal of the solvent, moisture removal, and the like with steam 10. A solvent containing harmful substances and vapor used for cleaning is separated into a harmful substance and a liquid solvent by a solvent refining equipment 19 to be described later, and the purified solvent is treated with the treatment tanks 20, 21, 22 is returned.
Furthermore, it is good to perform a drying process with the air 10 as needed.
The purified soil purified by the series of operations described above is taken out from the second treatment tank 21, returned to the environment, and reused.

かかる処理システムは、溶剤精製設備19、蒸気10及び空気23を有効利用するために処理槽数を複数設置し、前記浄化処理の各段階の操作を交互に実施する。そのために、前記溶剤精製設備19等と処理槽20、21、22との接続ラインに夫々バルブを設け、これらを調整することにより時間差をもって処理が行われるように構成される。
例えば、第1処理槽20、第2処理槽21、第3処理槽22の段階的に洗浄を行って順位処理を行う場合、まず、バルブ1aを開き第1処理槽20に汚染土壌1を投入する。そして、溶剤バルブ17aを開き溶剤供給槽23から溶剤を第1処理槽20に供給し必要に応じてバルブ19a、10aを開閉しながら洗浄工程、溶剤精製工程を行う。それと同時に時間差をもって開閉されたバルブ1bにより第1処理槽20から第2処理槽21に投入された汚染土壌1にもバルブ17b、19b、10bの開閉操作を行うことにより洗浄、溶剤精製工程を施す。このとき、前記第1処理槽20と処理段階を異ならせて処理が併行して行われるようにし、さらに第3処理槽22も同様の操作を行う。
Such a processing system is provided with a plurality of processing tanks in order to effectively use the solvent refining equipment 19, the steam 10 and the air 23, and alternately carries out the operation of each stage of the purification processing. For this purpose, valves are provided in connection lines between the solvent refining equipment 19 and the like and the treatment tanks 20, 21, and 22, and the treatment is performed with a time difference by adjusting these valves.
For example, in the case where the first treatment tank 20, the second treatment tank 21, and the third treatment tank 22 are cleaned stepwise to perform the ranking process, first, the valve 1 a is opened and the contaminated soil 1 is put into the first treatment tank 20. To do. Then, the solvent valve 17a is opened, the solvent is supplied from the solvent supply tank 23 to the first processing tank 20, and the cleaning process and the solvent purification process are performed while opening and closing the valves 19a and 10a as necessary. At the same time, the contaminated soil 1 introduced from the first treatment tank 20 to the second treatment tank 21 by the valve 1b opened and closed with a time difference is also subjected to a cleaning and solvent purification process by opening and closing the valves 17b, 19b and 10b. . At this time, the processing steps are different from those of the first processing tank 20 so that the processes are performed in parallel, and the third processing tank 22 performs the same operation.

これにより、前記前提技術と同様に、被処理物質である汚染土壌の性質、容量に応じた適切な処理が可能になるとともに、従来の焼却処理に比べて40%の運転コストの削減が実現できる。
また、複数の処理槽と溶剤精製設備との接続ラインに夫々バルブを設けて、該バルブを時間差を持って開閉操作することにより、該溶剤精製設備、蒸気及び空気供給設備等を有効利用できるとともに、設置面積を低減することができる。
As a result, similar to the base technology, it is possible to perform an appropriate treatment according to the nature and capacity of the contaminated soil that is the material to be treated, and to realize a 40% reduction in operating cost compared to the conventional incineration treatment. .
In addition, by providing a valve in each connection line between a plurality of treatment tanks and solvent purification equipment, and opening and closing the valve with a time difference, the solvent purification equipment, steam and air supply equipment, etc. can be used effectively. The installation area can be reduced.

ここで、上記した溶剤精製設備17について、図3を参照して簡単に説明する。
まず、油、PCB、ダイオキシン等の有害汚染物質、及び蒸気を含んだ溶剤は、気液分離器25に導入され、溶剤蒸気と液体状の溶剤とに分離される。該分離された溶剤蒸気は第1凝縮器30にて凝縮され、図1に示す本洗浄処理槽16若しくは図2に示す処理槽に送給されて再利用される。
一方、前記気液分離器25で分離された有害物質を含む液体状の溶剤は一時的に溶剤槽26に貯留され、逐次固液分離器27に送給される。かかる溶剤には少量の土壌が含まれており、前記固液分離器27にて該土壌を含む固体分と液体状の溶剤とに分離され、該分離固体は図1及び図2に示した汚染土壌に浸漬され再度洗浄処理を施される。
Here, the above-described solvent purification equipment 17 will be briefly described with reference to FIG.
First, a harmful pollutant such as oil, PCB, dioxin, and a solvent containing vapor are introduced into the gas-liquid separator 25 and separated into a solvent vapor and a liquid solvent. The separated solvent vapor is condensed in the first condenser 30, and is sent to the main cleaning treatment tank 16 shown in FIG. 1 or the treatment tank shown in FIG.
On the other hand, the liquid solvent containing harmful substances separated by the gas-liquid separator 25 is temporarily stored in the solvent tank 26 and is sequentially fed to the solid-liquid separator 27. Such a solvent contains a small amount of soil, and is separated into a solid component containing the soil and a liquid solvent by the solid-liquid separator 27, and the separated solid is contaminated as shown in FIGS. It is immersed in soil and washed again.

そして、前記固液分離器27にて分離された液体状の溶剤は蒸発器28にて蒸発した後第2凝縮器31にて凝縮され、前記第1凝縮器30にて回収された凝縮溶剤とともに本洗浄処理槽16に導かれる。
尚、前記蒸発器28内の溶剤は、一部熱交換器29を循環し、ここで蒸気33にて加熱される。
ここで、かかる溶剤精製設備19は汚染物質の性質、該設備の立地条件により蒸発器、凝縮器等の型式、機数は適宜選択できるようにする。
The liquid solvent separated by the solid-liquid separator 27 evaporates by the evaporator 28 and then condensed by the second condenser 31, together with the condensed solvent recovered by the first condenser 30. It is guided to the main cleaning tank 16.
The solvent in the evaporator 28 is partially circulated through the heat exchanger 29 where it is heated by the steam 33.
Here, the solvent refining equipment 19 can appropriately select the type and number of evaporators and condensers according to the nature of the pollutant and the location conditions of the equipment.

かかる実施形態における溶剤精製設備を図1及び図2に示した浄化システムに併設することで、溶剤を循環利用することができ、更なる運転コストの削減ができるとともに、該溶剤に含まれる有害物質を濃縮し大幅な容量の低減が可能となる。   By installing the solvent refining equipment in this embodiment in the purification system shown in FIGS. 1 and 2, the solvent can be circulated and the operation cost can be further reduced, and harmful substances contained in the solvent can be reduced. It is possible to greatly reduce the volume by concentrating.

大がかりな処理施設を設ける必用がなく、かつ運転経費を大幅に削減可能であるとともに、汚染物質の成分に適した溶剤を用いて大量の汚染土壌を高効率で以って洗浄可能な汚染土壌の浄化方法及びその装置を提供出来る。   There is no need to install a large-scale treatment facility, and the operating cost can be greatly reduced, and a large amount of contaminated soil can be washed with high efficiency using a solvent suitable for the component of the pollutant. A purification method and apparatus can be provided.

本発明の前提技術に係る土壌浄化システムの全体概略構成図を示す。1 shows an overall schematic configuration diagram of a soil purification system according to a prerequisite technology of the present invention. 本発明の実施形態に係る土壌浄化システムの全体概略構成図を示す。The whole schematic structure figure of the soil purification system concerning the embodiment of the present invention is shown. 本発明の実施形態に係る溶剤精製設備の概略構成図を示す。The schematic block diagram of the solvent refinement | purification equipment which concerns on embodiment of this invention is shown. 従来技術における汚染土の処理方法の手順を示すフローチャートである。It is a flowchart which shows the procedure of the processing method of the contaminated soil in a prior art.

符号の説明Explanation of symbols

15 粗洗浄処理槽
16 本洗浄処理槽
17 溶剤脱着槽
18 固液分離器
19 溶剤精製設備
20 第1処理槽
21 第2処理槽
22 第3処理槽
25 気液分離器
27 固液分離器
28 蒸発器
30、31 凝縮器
1a、1b、1c、10a、10b、10c、17a、17b、17c、19a、19b、19c バルブ
DESCRIPTION OF SYMBOLS 15 Coarse-cleaning processing tank 16 Main cleaning processing tank 17 Solvent desorption tank 18 Solid-liquid separator 19 Solvent refining equipment 20 1st processing tank 21 2nd processing tank 22 3rd processing tank 25 Gas-liquid separator 27 Solid-liquid separator 28 Evaporation 30, 31 Condenser 1a, 1b, 1c, 10a, 10b, 10c, 17a, 17b, 17c, 19a, 19b, 19c Valve

Claims (1)

油、PCB又はダイオキシン類等の有害物質で汚染された土壌を浸漬洗浄する方法において、
汚染土壌ラインと前記複数の処理槽が接続される第1のバルブ群と、前記複数の夫々の処理槽と後記する溶剤精製設備間が夫々第2のバルブ群を介して接続されるとともに、溶剤を回収するための蒸気を夫々の処理槽に供給する蒸気接続ラインを第3のバルブ群を介して設けるとともに、
前記夫々の処理槽より回収される有害汚染物質を含んだ溶剤を蒸発させ、該蒸発させた溶剤蒸気を凝縮させて前記溶剤の精製を行う溶剤精製設備を前記複数の処理槽より少数を設けてなる土壌浄化装置にあって、
前記夫々の処理槽の処理段階を異ならせて、
前記第1バルブ群の開閉操作により夫々の処理槽へ汚染土壌が順次投入され溶剤にて洗浄処理を行う洗浄工程と、夫々の処理槽に蒸気を供給する蒸気接続ラインの第3のバルブ群の開閉操作により、前記該洗浄工程により有害物質で汚染された溶剤を蒸気回収する溶剤脱着工程と、前記第2バルブ群の開閉操作により対応する処理槽より回収された溶剤を精製して再利用する溶剤精製工程とが併行して行われるようにし
前記溶剤精製工程は、
前記土壌の洗浄を経て回収された溶剤のうちの有害物質を含む液体状の溶剤を溶剤蒸気から分離する気液分離工程と、
さらに前記液体状溶剤から土壌等の固体分を除去する固液分離工程と、
前記固体分が除去された液体状溶剤のうち溶剤と汚染物質とを蒸気により分離する蒸発工程と、からなることを特徴とする汚染土壌の浄化方法。
In the method of dip cleaning soil contaminated with harmful substances such as oil, PCB or dioxins,
A first valve group which contaminated soil line and said plurality of processing tanks is connected, together with the solvent refining set 備間 is connected via a respective second group of valves to the treatment tank and below the plurality of respective, A steam connection line for supplying the steam for recovering the solvent to each processing tank is provided via the third valve group , and
Evaporating the solvent containing harmful contaminants recovered from the treatment vessel of said respective, provided fewer than the solvent refining facilities said plurality of processing tanks for performing purification of the solvent by condensing the solvent vapor obtained by the evaporation In the soil purification device
Different processing stages of the respective processing tanks,
A cleaning process in which contaminated soil is sequentially introduced into each processing tank by opening and closing the first valve group and cleaning is performed with a solvent, and a third valve group of a steam connection line for supplying steam to each processing tank A solvent desorption process for recovering vapor of the solvent contaminated with harmful substances by the cleaning process by the opening / closing operation and a solvent recovered from the corresponding processing tank by the opening / closing operation of the second valve group are purified and reused. So that the solvent refining process is performed in parallel .
The solvent purification step includes
A gas-liquid separation step for separating a liquid solvent containing harmful substances out of the solvent recovered through washing of the soil from the solvent vapor;
Furthermore, a solid-liquid separation process for removing solids such as soil from the liquid solvent,
A method for purifying contaminated soil, comprising: an evaporation step of separating a solvent and a pollutant from the liquid solvent from which the solid content has been removed by steam .
JP2005035310A 2005-02-10 2005-02-10 Purification method and apparatus for contaminated soil Expired - Fee Related JP3935910B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005035310A JP3935910B2 (en) 2005-02-10 2005-02-10 Purification method and apparatus for contaminated soil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005035310A JP3935910B2 (en) 2005-02-10 2005-02-10 Purification method and apparatus for contaminated soil

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP2000160407A Division JP3771778B2 (en) 2000-05-30 2000-05-30 Method and apparatus for purification of contaminated soil

Publications (2)

Publication Number Publication Date
JP2005131641A JP2005131641A (en) 2005-05-26
JP3935910B2 true JP3935910B2 (en) 2007-06-27

Family

ID=34651194

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005035310A Expired - Fee Related JP3935910B2 (en) 2005-02-10 2005-02-10 Purification method and apparatus for contaminated soil

Country Status (1)

Country Link
JP (1) JP3935910B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5794894B2 (en) * 2011-10-31 2015-10-14 三菱重工業株式会社 Processing equipment for PCB contaminants other than non-ferrous metals
JP6124098B1 (en) * 2016-09-27 2017-05-10 有限会社加藤創研 Method and system for cleaning oil contaminated soil

Also Published As

Publication number Publication date
JP2005131641A (en) 2005-05-26

Similar Documents

Publication Publication Date Title
US5814234A (en) Integrated soil and fluid decontamination system
KR101721614B1 (en) Apparatus and method for treating gas discharged from cement kiln
EP2965801B1 (en) Co2 recovery system and co2 recovery method
JP2011056500A (en) Device and method for processing combustion exhaust gas
KR101645426B1 (en) System and method for remediation of dredged soil or sediment
Lee et al. Mercury recovery from mercury-containing wastes using a vacuum thermal desorption system
JP2007181784A (en) Waste treatment apparatus
JP2013248548A (en) Exhaust gas treatment method and exhaust gas treatment device
Zhou et al. Supercritical fluid extraction–Oxidation technology to remediate PCB‐contaminated soils/sediments: An economic analysis
CN109607927B (en) Method for recycling refined and chemical oil products containing hazardous oil wastes
JP3935910B2 (en) Purification method and apparatus for contaminated soil
JP2007268424A (en) Separation method of pcb-contaminated material
JP2003225643A (en) Apparatus and method for treating organic contaminant
JP3771778B2 (en) Method and apparatus for purification of contaminated soil
KR100909210B1 (en) Organic exhaust gas treatment method and apparatus
JP2007301416A (en) Treatment method for pcb waste and its treatment facility
JP2001096134A (en) Treatment method of combustion gas containing heavy metal
KR20120122173A (en) Method for meditating contaminated soil
JP3692325B2 (en) Soil purification equipment
JP4017626B2 (en) Oil-containing wastewater treatment method
CN108751513B (en) System for be used for thermal desorption to contain mercury waste water treatment and mercury recycling recovery thereof
JPH11244660A (en) Treatment of dust-containing waste gas and device therefor
JP3751572B2 (en) Pollution treatment method
JP2005161315A (en) Method for treating contaminant
JP2017090108A (en) Radioactive contaminant treatment method and radioactive contaminant treatment facility

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20050210

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20060608

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20060728

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20060925

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20061201

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20070129

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20070316

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20070320

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110330

Year of fee payment: 4

LAPS Cancellation because of no payment of annual fees