JP2001009059A - Method for removing hazardous material in soil - Google Patents
Method for removing hazardous material in soilInfo
- Publication number
- JP2001009059A JP2001009059A JP11182509A JP18250999A JP2001009059A JP 2001009059 A JP2001009059 A JP 2001009059A JP 11182509 A JP11182509 A JP 11182509A JP 18250999 A JP18250999 A JP 18250999A JP 2001009059 A JP2001009059 A JP 2001009059A
- Authority
- JP
- Japan
- Prior art keywords
- soil
- gas
- harmful substances
- ozone
- oxidizing agent
- 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.)
- Pending
Links
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Fire-Extinguishing Compositions (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、土壌中の有害物質
を、注入井戸から土壌中に供給された気体によって除去
し、抽出井戸から回収する土壌中有害物質の除去方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing harmful substances in soil by removing harmful substances in soil by a gas supplied into the soil from an injection well and recovering the same from an extraction well.
【０００２】[0002]
【従来の技術】土壌中に存在する揮発性有機化合物（Ｖ
ＯＣ）を回収、除去する方法として、注入井戸から土壌
中に気体を供給し、この気体に土壌中の揮発性有機化合
物を移動させた後、気体とともに抽出井戸から吸引、回
収する方法がある。2. Description of the Related Art Volatile organic compounds (V
As a method for recovering and removing OC), there is a method in which a gas is supplied into the soil from an injection well, a volatile organic compound in the soil is moved to the gas, and then the gas is sucked and recovered from the extraction well together with the gas.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記方
法の場合、多数の注入井戸及び抽出井戸を土壌中に立設
し、そのそれぞれに気体供給用のコンプレッサや気体回
収用の真空装置を接続する必要があった。また、大量の
気体を回収するため、回収された気体の処理装置にも大
型のものが必要となり、その結果、装置が大規模化し、
かつ揮発性有機化合物の除去及び、装置の設置や撤収に
長時間を要するという問題があった。本発明は上記事情
に鑑みてなされたもので、上記揮発性有機化合物を始め
とする土壌中の有害物質を、小規模の装置により、短時
間で効率よく除去することをその目的としている。However, in the case of the above method, a large number of injection wells and extraction wells need to be erected in the soil, and a compressor for supplying gas and a vacuum device for recovering gas must be connected to each of them. was there. Also, in order to collect a large amount of gas, a large-sized processing device for the collected gas is required, and as a result, the device becomes large-scale,
In addition, there is a problem that it takes a long time to remove volatile organic compounds and to install and withdraw the apparatus. The present invention has been made in view of the above circumstances, and an object of the present invention is to efficiently remove harmful substances in the soil including the volatile organic compounds in a short time by a small-scale device.
【０００４】[0004]
【課題を解決するための手段】本発明は、土壌中の有害
物質を、注入井戸から上記土壌中に供給された気体とと
もに抽出井戸から回収する土壌中有害物質の除去方法に
おいて、上記気体がオゾンであるか、もしくはオゾンと
酸素と酸化剤とを含有することにより、上記有害物質の
少なくとも一部が回収前に分解されることを特徴として
いる。According to the present invention, there is provided a method for removing harmful substances in soil, wherein the harmful substances in soil are recovered from an extraction well together with a gas supplied into the soil from an injection well. Or containing ozone, oxygen and an oxidizing agent, at least a part of the harmful substance is decomposed before recovery.
【０００５】後者の場合、上記気体が、オゾンと空気と
酸化剤とを含有していてもよい。上記酸化剤は、過酸化
水素または次亜塩素酸であることが望ましい。[0005] In the latter case, the gas may contain ozone, air, and an oxidizing agent. The oxidizing agent is desirably hydrogen peroxide or hypochlorous acid.
【０００６】また、本発明に係る土壌中有害物質の除去
方法により除去可能な有害物質には、上記揮発性有機化
合物の他、例えばダイオキシン、ＰＣＢ、シアン等の、
酸化分解可能な有害物質が含まれる。The harmful substances that can be removed by the method for removing harmful substances from soil according to the present invention include, in addition to the volatile organic compounds, dioxin, PCB, cyanide, and the like.
Contains oxidatively degradable harmful substances.
【０００７】[0007]
【発明の実施の形態】以下、図面に基づき、本発明の実
施形態について説明する。本発明に係る土壌中有害物質
の除去方法に用いられる装置は、基本的には通常の除去
方法に用いられる装置と同様である。符号１，１ａは注
入井戸で、符号１で示す注入井戸は、土壌２中の不飽和
層（図中矢印Ａで示す範囲）に開口するよう土壌２中に
立設され、符号１ａで示す注入井戸は、不飽和層Ａを貫
通して帯水層（図中矢印Ｂで示す範囲）に開口するよう
土壌２中に立設されている。また、注入井戸１，１ａの
上端は、いずれも管路３及びコンプレッサ４を介して気
体供給装置５に連結されている。Embodiments of the present invention will be described below with reference to the drawings. The device used for the method for removing harmful substances in soil according to the present invention is basically the same as the device used for a normal removal method. Reference numerals 1 and 1a denote injection wells, and an injection well indicated by reference numeral 1 is erected in soil 2 so as to open into an unsaturated layer (range indicated by arrow A in the figure) in soil 2 and is injected by reference numeral 1a. The well is erected in the soil 2 so as to penetrate the unsaturated layer A and open to an aquifer (range indicated by an arrow B in the figure). The upper ends of the injection wells 1 and 1a are both connected to a gas supply device 5 via a pipeline 3 and a compressor 4.
【０００８】符号６，６ａは抽出井戸で、抽出井戸６，
６ａは、注入井戸１，１ａ近傍の不飽和層Ａ内にて、土
壌２中に立設されている。また、抽出井戸６，６ａの上
端は、いずれも管路７を介して真空吸引装置８及び気体
処理装置９に連結されている。Reference numerals 6 and 6a denote extraction wells.
6a is erected in the soil 2 in the unsaturated layer A near the injection wells 1 and 1a. The upper ends of the extraction wells 6 and 6a are all connected to a vacuum suction device 8 and a gas treatment device 9 via a pipeline 7.
【０００９】土壌２中の有害物質の除去に際しては、気
体供給装置５から供給される気体を、管路３を介して注
入井戸１，１ａに供給し、注入井戸１，１ａから不飽和
層Ａまたは帯水層Ｂにそれぞれ供給する。また、気体の
供給とともに、真空吸引装置８を作動させ、抽出井戸
６，６ａの周囲に存在する気体を吸引する。一方、上記
気体量が不足した場合には、コンプレッサ４を作動させ
て空気を供給する。When removing harmful substances from the soil 2, the gas supplied from the gas supply device 5 is supplied to the injection wells 1 and 1a via the pipe 3, and the unsaturated layer A is supplied from the injection wells 1 and 1a. Alternatively, the water is supplied to the aquifer B. In addition, the vacuum suction device 8 is operated together with the supply of the gas to suck the gas existing around the extraction wells 6 and 6a. On the other hand, when the gas amount is insufficient, the compressor 4 is operated to supply air.
【００１０】その結果、注入井戸１から不飽和層Ａに供
給された気体は、矢印Ｃで示すように、不飽和層Ａ内を
移動し、隣接する抽出井戸６に回収される。一方、注入
井戸１ａから帯水層Ｂに供給された気体は、矢印Ｄで示
すように、帯水層Ｂ中の地下水と接触しながら上昇し、
不飽和層Ａにて抽出井戸６ａに回収される。回収された
気体は、管路７を介して気体処理装置９に送られ、気体
処理装置９にて、例えば酸化分解や活性炭への吸着等に
よる有害物質の除去処理を受けた後、大気中に排出され
る。As a result, the gas supplied from the injection well 1 to the unsaturated layer A moves in the unsaturated layer A as shown by the arrow C, and is collected in the adjacent extraction well 6. On the other hand, the gas supplied from the injection well 1a to the aquifer B rises while coming into contact with the groundwater in the aquifer B as shown by an arrow D,
It is collected in the extraction well 6a in the unsaturated layer A. The recovered gas is sent to a gas treatment device 9 through a pipe 7 and subjected to a removal treatment of harmful substances by, for example, oxidative decomposition or adsorption to activated carbon. Is discharged.
【００１１】本発明に係る土壌中有害物質の除去方法で
は、気体供給装置５から管路３及び注入井戸１，１ａを
介して土壌２中に供給される気体に、オゾン単独もしく
は、オゾンと酸素と酸化剤とを含有する気体を使用す
る。後者の場合、具体的には、オゾンと酸素と酸化剤ま
たはオゾンと空気と酸化剤との混合気体を使用する。ま
た、酸化剤には、過酸化水素または次亜塩素酸を使用す
る。In the method for removing harmful substances from soil according to the present invention, the gas supplied from the gas supply device 5 into the soil 2 via the pipe 3 and the injection wells 1 and 1a is supplied with ozone alone or ozone and oxygen. And a gas containing an oxidizing agent. In the latter case, specifically, a mixed gas of ozone, oxygen, and oxidant or ozone, air, and oxidant is used. In addition, hydrogen peroxide or hypochlorous acid is used as the oxidizing agent.
【００１２】すると、土壌２中の有害物質が、土壌２中
にて、オゾンによる酸化分解またはオゾンと酸素と酸化
剤とによる促進酸化分解を受け、二酸化炭素、水、塩素
ガス、あるいは塩酸等に分解される。これら分解産物
は、土壌２中に溶解して無害化されるか、気体中に取り
込まれ、抽出井戸６，６ａに回収される。また、並行し
て有害物質自身も気体中に取り込まれて抽出井戸６，６
ａに回収され、気体処理装置９にて除去される。Then, the harmful substances in the soil 2 are subjected to oxidative decomposition by ozone or accelerated oxidative decomposition by ozone, oxygen and an oxidizing agent in the soil 2 to carbon dioxide, water, chlorine gas or hydrochloric acid. Decomposed. These decomposition products are dissolved in the soil 2 to make them harmless, or taken into the gas, and collected in the extraction wells 6, 6a. At the same time, the harmful substances themselves are taken into the gas and the extraction wells 6,6
a and is removed by the gas treatment device 9.
【００１３】すなわち、本発明によれば、土壌２中の有
害物質が、供給される気体の作用により土壌２中にて予
め分解されるため、有害物質の除去効率が向上する。そ
の結果、土壌２中に立設される注入井戸１，１ａ及び抽
出井戸６，６ａの数を減少させることが可能となり、か
つ有害物質の除去及び、装置の設置や撤収に要する時間
が短縮される。また、注入井戸１，１ａ及び抽出井戸
６，６ａの数が減少するため、コンプレッサ４、真空吸
引装置８及び気体処理装置９も小規模で済む。That is, according to the present invention, the harmful substances in the soil 2 are previously decomposed in the soil 2 by the action of the supplied gas, so that the harmful substance removal efficiency is improved. As a result, the number of the injection wells 1, 1a and the extraction wells 6, 6a erected in the soil 2 can be reduced, and the time required for removal of harmful substances and installation and withdrawal of equipment is reduced. You. In addition, since the number of the injection wells 1 and 1a and the number of the extraction wells 6 and 6a are reduced, the compressor 4, the vacuum suction device 8, and the gas treatment device 9 can be small.
【００１４】しかも、除去の対象となる有害物質が、上
記揮発性有機化合物の他、例えばダイオキシン、ＰＣ
Ｂ、シアン等の、酸化分解可能な有害物質へと拡大する
ため、従来では土壌２中での処理が困難であった有害物
質の処理も可能となる。In addition, the harmful substances to be removed are, for example, dioxin and PC in addition to the volatile organic compounds.
Since it is expanded to toxic substances that can be oxidized and decomposed, such as B and cyanide, it is possible to treat harmful substances that were conventionally difficult to treat in the soil 2.
【００１５】なお、図１では、不飽和層Ａにおける有害
物質の除去に使用される注入井戸１及び抽出井戸６と、
帯水層Ｂにおける有害物質の除去に使用される注入井戸
１ａ及び抽出井戸６ａとを、同一の気体供給装置５、コ
ンプレッサ４、真空吸引装置８及び気体処理装置９に接
続する構成となっているが、この構成は便宜的なもの
で、符号１及び６で示す注入井戸及び抽出井戸と、符号
１ａ及び６ａで示す注入井戸及び抽出井戸とを、別々の
気体供給装置５、コンプレッサ４、真空吸引装置８及び
気体処理装置９にそれぞれ接続し、これらを同時または
選択的に使用することももちろん可能である。In FIG. 1, an injection well 1 and an extraction well 6, which are used for removing harmful substances in the unsaturated layer A,
The injection well 1a and the extraction well 6a used for removing harmful substances in the aquifer B are connected to the same gas supply device 5, compressor 4, vacuum suction device 8, and gas treatment device 9. However, this configuration is for the sake of convenience, and the injection wells and extraction wells denoted by reference numerals 1 and 6 and the injection wells and extraction wells denoted by reference numerals 1a and 6a are separated from each other by a separate gas supply device 5, a compressor 4, and a vacuum suction. It is of course also possible to connect to the device 8 and the gas treatment device 9, respectively, and use them simultaneously or selectively.
【００１６】[0016]
【発明の効果】以上説明した通り、本発明に係る土壌中
有害物質の除去方法によれば、土壌中の有害物質が、土
壌中にて、注入井戸から供給されたオゾンによる酸化分
解またはオゾンと酸素と酸化剤とによる促進酸化分解を
受けて予め分解される。その結果、土壌中の有害物質
を、小規模の装置により、短時間で効率よく除去するこ
とが可能となる。As described above, according to the method for removing harmful substances in soil according to the present invention, harmful substances in soil are oxidized or decomposed by ozone supplied from the injection well in the soil. Decomposed in advance by undergoing accelerated oxidative decomposition by oxygen and an oxidizing agent. As a result, harmful substances in the soil can be efficiently removed in a short time by a small-scale device.
【００１７】更に、除去の対象となる有害物質が、揮発
性有機化合物（ＶＯＣ）の他、例えばダイオキシン、Ｐ
ＣＢ、シアン等の、酸化分解可能な有害物質へと拡大す
るため、従来では土壌中での処理が困難であった有害物
質の処理も可能となる。Furthermore, harmful substances to be removed are not only volatile organic compounds (VOC) but also dioxins, P
Since it is expanded to harmful substances that can be decomposed by oxidation, such as CB and cyanide, it is possible to treat harmful substances that have conventionally been difficult to treat in soil.
【図１】本発明に係る土壌中有害物質の除去方法に使用
される装置の例を示す図である。FIG. 1 is a diagram showing an example of an apparatus used for a method for removing harmful substances in soil according to the present invention.
１，１ａ 注入井戸 ２ 土壌 ６，６ａ 抽出井戸 1,1a Injection well 2 Soil 6,6a Extraction well
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） // Ｅ２１Ｂ 43/00 Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat II (reference) // E21B 43/00
Claims (4)
土壌中に供給された気体とともに抽出井戸から回収する
土壌中有害物質の除去方法において、 上記気体がオゾンであることを特徴とする土壌中有害物
質の除去方法。1. A method for removing harmful substances in soil, wherein harmful substances in soil are collected from an extraction well together with a gas supplied into the soil from an injection well, wherein the gas is ozone. How to remove harmful substances.
土壌中に供給された気体とともに抽出井戸から回収する
土壌中有害物質の除去方法において、 上記気体が、オゾンと酸素と酸化剤とを含有することを
特徴とする土壌中有害物質の除去方法。2. A method for removing harmful substances in soil by collecting harmful substances in soil from an extraction well together with a gas supplied into the soil from an injection well, wherein the gas comprises ozone, oxygen, and an oxidant. A method for removing harmful substances in soil, characterized in that the substance is contained.
含有することを特徴とする請求項２に記載の土壌中有害
物質の除去方法。3. The method according to claim 2, wherein the gas contains ozone, air, and an oxidizing agent.
素酸から選択されることを特徴とする請求項２または３
に記載の土壌中有害物質の除去方法。4. The method according to claim 2, wherein said oxidizing agent is selected from hydrogen peroxide or hypochlorous acid.
3. The method for removing harmful substances in soil according to 1.).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11182509A JP2001009059A (en) | 1999-06-28 | 1999-06-28 | Method for removing hazardous material in soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11182509A JP2001009059A (en) | 1999-06-28 | 1999-06-28 | Method for removing hazardous material in soil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001009059A true JP2001009059A (en) | 2001-01-16 |
Family
ID=16119554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11182509A Pending JP2001009059A (en) | 1999-06-28 | 1999-06-28 | Method for removing hazardous material in soil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001009059A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002200480A (en) * | 2000-12-28 | 2002-07-16 | Shinichi Ueda | Soil decontamination process |
| JP2002254062A (en) * | 2001-02-28 | 2002-09-10 | Shimizu Corp | In site restoration method and equipment for organic- contaminated soil |
| JP2002254061A (en) * | 2001-02-28 | 2002-09-10 | Shimizu Corp | In situ clarification method and equipment for combined pollution soil |
-
1999
- 1999-06-28 JP JP11182509A patent/JP2001009059A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002200480A (en) * | 2000-12-28 | 2002-07-16 | Shinichi Ueda | Soil decontamination process |
| JP4636679B2 (en) * | 2000-12-28 | 2011-02-23 | 大阪瓦斯株式会社 | Soil purification method |
| JP2002254062A (en) * | 2001-02-28 | 2002-09-10 | Shimizu Corp | In site restoration method and equipment for organic- contaminated soil |
| JP2002254061A (en) * | 2001-02-28 | 2002-09-10 | Shimizu Corp | In situ clarification method and equipment for combined pollution soil |
| JP4671073B2 (en) * | 2001-02-28 | 2011-04-13 | 清水建設株式会社 | In-situ repair method for soil contaminated with organic matter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6283674B1 (en) | In-well air stripping, oxidation, and adsorption | |
| JP2007253059A (en) | In situ cleaning method of oil-contaminated soil | |
| JPS6153994A (en) | Recovery of methane from garbage reclaiming and treating area | |
| US5387057A (en) | Contaminated ground site remediation system | |
| JP2007260610A (en) | Cleaning method of contaminated soil | |
| JP2001009059A (en) | Method for removing hazardous material in soil | |
| JP2001009060A (en) | Method for removing hazardous material in soil | |
| KR20020091479A (en) | Purification apparatus and method for contaminated soil by electron beam irradiation | |
| JPH10309563A (en) | Purifying device of soil and purifying method thereof | |
| Hinchee et al. | Enhanced bioreclamation, soil venting and ground-water extraction: a cost-effectiveness and feasibility comparison | |
| JPH11300334A (en) | Decomposing and removing method of organic chlorine compound such as dioxins in soil | |
| JP2007253058A (en) | Method for recovering oil from oil-contaminated soil in situ | |
| JP2003205221A5 (en) | ||
| JP2004025091A (en) | Decontamination method of soil | |
| CN211803057U (en) | Soil and groundwater pollution monitoring and prosthetic integration system | |
| JP2000061443A (en) | Device for separating and removing harmful material | |
| KR100249273B1 (en) | Ozone-enhanced remediation technology for soil-contaminated with organic compounds | |
| JP2002136961A (en) | Decontamination method for soil or underground water | |
| JP3880962B2 (en) | How to handle hazardous substances | |
| JP4088380B2 (en) | Purification method for contaminated soil | |
| JP2667541B2 (en) | On-site purification system for polluted groundwater | |
| JP2001269640A (en) | Device and method for removing noxious gas | |
| JP2004105870A (en) | Method and apparatus for purification of soil and groundwater | |
| JP4112122B2 (en) | How to remove harmful substances in groundwater | |
| KR200250104Y1 (en) | Purification apparatus for contaminated soil by electron beam irradiation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20060113 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20090203 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20090609 |