JPH06238260A - Removal of soil contamination with organochlorine compound - Google Patents
Removal of soil contamination with organochlorine compoundInfo
- Publication number
- JPH06238260A JPH06238260A JP5065873A JP6587393A JPH06238260A JP H06238260 A JPH06238260 A JP H06238260A JP 5065873 A JP5065873 A JP 5065873A JP 6587393 A JP6587393 A JP 6587393A JP H06238260 A JPH06238260 A JP H06238260A
- Authority
- JP
- Japan
- Prior art keywords
- soil
- water
- ozone
- trichlorethylene
- substance
- 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
- 239000002689 soil Substances 0.000 title claims abstract description 28
- 238000011109 contamination Methods 0.000 title claims description 3
- 150000004045 organic chlorine compounds Chemical class 0.000 title description 5
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims abstract description 29
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 230000001590 oxidative effect Effects 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 3
- CYTYCFOTNPOANT-UHFFFAOYSA-N Perchloroethylene Chemical group ClC(Cl)=C(Cl)Cl CYTYCFOTNPOANT-UHFFFAOYSA-N 0.000 claims description 2
- 229950011008 tetrachloroethylene Drugs 0.000 claims description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims 1
- 229910052801 chlorine Inorganic materials 0.000 claims 1
- 239000000460 chlorine Substances 0.000 claims 1
- 150000001805 chlorine compounds Chemical class 0.000 claims 1
- 238000005406 washing Methods 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 13
- 238000002347 injection Methods 0.000 abstract description 9
- 239000007924 injection Substances 0.000 abstract description 9
- 238000009792 diffusion process Methods 0.000 abstract description 5
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 3
- 230000002265 prevention Effects 0.000 abstract description 2
- 238000004904 shortening Methods 0.000 abstract description 2
- 239000000356 contaminant Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000003900 soil pollution Methods 0.000 description 3
- HFFLGKNGCAIQMO-UHFFFAOYSA-N trichloroacetaldehyde Chemical compound ClC(Cl)(Cl)C=O HFFLGKNGCAIQMO-UHFFFAOYSA-N 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 235000020681 well water Nutrition 0.000 description 2
- 239000002349 well water Substances 0.000 description 2
- KPWDGTGXUYRARH-UHFFFAOYSA-N 2,2,2-trichloroethanol Chemical compound OCC(Cl)(Cl)Cl KPWDGTGXUYRARH-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000013142 basic testing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002680 soil gas Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 229940029273 trichloroacetaldehyde Drugs 0.000 description 1
- YNJBWRMUSHSURL-UHFFFAOYSA-N trichloroacetic acid Chemical compound OC(=O)C(Cl)(Cl)Cl YNJBWRMUSHSURL-UHFFFAOYSA-N 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Landscapes
- Fire-Extinguishing Compositions (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、土壌中に残留するト
リクロロエチレンなどの有機塩素系化合物を、オゾンガ
スにより酸化し安全な形で除去しようとする、有機塩素
系化合物による土壌汚染の除去方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing soil contamination by organochlorine compounds, which tries to remove trichlorethylene and other organochlorine compounds remaining in soil by ozone gas in a safe form. Is.
【０００２】[0002]
（イ） 土壌中の有害物質に関する環境基準が平成３年
８月に告示され、環境庁は４年春より土壌汚染に関する
規制策の検討を始めた。ＩＣなどハイテク産業やクリー
ニング業などで使われるトリクロロエチレンや、テトラ
クロロエチレンによる地下水汚染が依然続いていること
を、環境庁は平成４年１１月の全国調査でまとめてい
る。この全国調査では、広範囲な地区で土壌汚染が確認
されたが大半の自治体は、除去費用が膨大な点で対応に
苦慮しており、根本的な対策に踏み切れないでいる。対
策の必要な事業所はかなりの数に昇り、コストの安い除
去法が開発されればその普及は急速に進むものと思われ
る。 （ロ） 更に厚生省が諮問した”水道水質に関する基準
の在り方“で、水質基準の拡充、強化を図るため、一般
有機塩素化合物のトリクロロエチレンも、今年度より新
たに規制対象に加わることになった。したがって、今後
も監視対象物質として、益々注目される化合物であり、
潜在需要は図り知れないものがある。 （ハ） トリクロロエチレンは発癌性物質生成への前駆
物質とされており、土中に残留し地下水に微量ずつ溶出
して井水を長期間汚染することから、汚染の拡散を防ぐ
ために早期の除去対策が急務とされている。(B) Environmental standards for harmful substances in soil were announced in August 1991, and the Environment Agency began studying regulatory measures for soil pollution in the spring of 4th year. According to a national survey conducted in November 1992, the Environmental Agency summarized that groundwater pollution by trichlorethylene and tetrachlorethylene, which are used in high-tech industries such as IC and in the cleaning industry, is still continuing. In this national survey, soil pollution was confirmed in a wide range of areas, but most local governments are having difficulty responding to the problems due to the enormous cost of removal, and cannot take radical measures. It is expected that the number of business establishments requiring countermeasures will increase to a considerable extent, and if low-cost removal methods are developed, their diffusion will progress rapidly. (B) In addition, in order to expand and strengthen water quality standards in accordance with the “Ideal standards for tap water quality” consulted by the Ministry of Health and Welfare, trichlorethylene, a general organochlorine compound, will be newly added from this fiscal year. Therefore, it is a compound that will continue to receive increasing attention as a substance to be monitored,
Potential demand is immeasurable. (C) Trichlorethylene is a precursor for the formation of carcinogens, and it remains in the soil and elutes in trace amounts into groundwater to contaminate well water for a long period of time, so early removal measures should be taken to prevent the spread of pollution. Is urgently needed.
【０００３】[0003]
【発明が解決しようとする課題】これは次のような欠点
があった。トリクロロエチレンはその特性より水に溶け
がたく、かつ比重１．４５９と重く、土壌中にあっては
徐々に下方に沈み、長期間にわたり微量ながら水に溶
け、広範囲な井水汚染源となる。現在対応策として、井
戸を掘り内部を減圧して有害物質を含む土壌ガスを地下
水と同時に引き出す、いわゆる真空抽出法が一部で実用
化されている。しかしながらこの方法では、短期間に除
去することが難しいうえに、かつ処理コストも高価であ
る点が問題である。本発明は、これらの欠点を除くため
になされたものである。However, this has the following drawbacks. Due to its characteristics, trichlorethylene is insoluble in water and has a high specific gravity of 1.459. It gradually sinks downward in the soil, dissolves in water in a trace amount for a long period of time, and becomes a widespread source of well water pollution. Currently, as a countermeasure, a so-called vacuum extraction method, in which a well is dug and the inside pressure is reduced to extract soil gas containing harmful substances simultaneously with groundwater, has been put into practical use. However, this method has a problem in that it is difficult to remove in a short period of time and the processing cost is high. The present invention has been made to eliminate these drawbacks.
【０００４】[0004]
【課題を解決するための手段】図１に示す如く、土壌
（９）の汚染部（４）に、オゾン圧入管（３）を打ち込
み、オゾン発生装置（１）によりオゾンガスを圧入し
て、オゾンにより土中に有るトリクロロエチレンを酸化
して水溶性物質に変化させ、更に水注入管（１２）によ
り注水して可溶性有機物質を溶解させ、水・ガス排出管
（１１）により上部に汲み上げることによって、土壌
（９）に含まれているトリクロロエチレンを除去するも
のである。本発明は、以上の構成よりなる、有機塩素系
化合物による土壌汚染の除去方法である。As shown in FIG. 1, an ozone injection pipe (3) is driven into a contaminated part (4) of soil (9), and ozone gas is injected by an ozone generator (1) to generate ozone. By oxidizing trichlorethylene present in the soil with water to change it into a water-soluble substance, water is further injected through the water injection pipe (12) to dissolve the soluble organic substance, and the water / gas discharge pipe (11) pumps it up to Trichloroethylene contained in the soil (9) is removed. The present invention is a method for removing soil pollution by an organic chlorine compound having the above-mentioned constitution.
【０００５】[0005]
【作用】一般にトリクロロエチレンとオゾンの酸化反応
により生成される物質として考えられる物は、トリクロ
ロ酢酸、トリクロロアセトアルデヒド（クロラール）、
トリクロロエタノール等である。オゾンによる酸化反応
により生成する物質は、いずれも水に対して可溶性であ
り、オゾンによる酸化処理により土中に注入し溶解さ
せ、その水を地上に回収することによりトリクロロエチ
レンを除去できると思われる。したがってこの方法によ
れば、土壌中のトリクロロエチレンを短期間のうちに除
去することが可能となり、処理コストも安く酸化物は水
により安全に取り出すことができ、しかも工期が短いた
め周囲への汚染拡散も防ぐことができる。[Function] Generally, substances that are considered to be produced by the oxidation reaction of trichlorethylene and ozone are trichloroacetic acid, trichloroacetaldehyde (chloral),
Trichloroethanol and the like. All the substances produced by the oxidation reaction with ozone are soluble in water, and it is considered that trichlorethylene can be removed by injecting it into soil by the oxidation treatment with ozone to dissolve it and collecting the water on the ground. Therefore, according to this method, trichlorethylene in the soil can be removed in a short period of time, the treatment cost is low, and the oxides can be safely taken out with water. Moreover, the construction period is short, and the diffusion of pollution to the surroundings is possible. Can also be prevented.
【０００６】[0006]
【実施例】以下、本発明の実施例を図面に基づいて詳細
に説明する。図１は、本発明の構成を示したものであ
る。 （イ） 土壌（９）の汚染部（４）にオゾン圧入管
（３）を打込み、オゾン発生装置（１）によりオゾンガ
スを圧入して、オゾンにより土中に有るトリクロロエチ
レンを酸化して水溶性物質に変化させる。 （ロ） 水注入管（１２）により、土壌（９）に注水し
て可溶性有機物質を溶解させ、水・ガス排出管（１１）
により地上に汲み上げることによって、土壌（９）に含
まれているトリクロロエチレンを除去するものである。 本発明は以上のような構成で、試験及び実験結果は次の
通りである。 （イ）＜オゾンとトリクロロエチレンの反応基礎試験＞ ガスバリヤー性の有る密封袋にトリクロロエチレンを分
注した試料２個を準備した。試験区としてオゾン約１０
００ｐｐｍ濃度の空気を封入、一方対象区として空気の
み同一容量封入した。１時間後に両方のトリクロロエチ
レン濃度を検知管により測定した。その結果、試験区は
トリクロロエチレンが検出されず、対象区は、ほぼトリ
クロロエチレン注入量に見合った濃度が検出された。依
頼試験の結果、トリクロロエチレン濃度は対象区の１／
１００以下しか検出されず、基礎試験の裏付けが証明さ
れ、オゾンがトリクロロエチレンを分解可能であること
が判明した。 （ロ）＜土壌中に残留したトリクロロエチレンのオゾン
分解実験＞ 某メッキ企業で、地表より１Ｍの地中に微量残留するト
リクロロエチレンをオゾン酸化する実験を行った。先端
部に空気孔を設けたパイプを一Ｍの深さに埋め、上部よ
りオゾン空気を連続して注入した。 試験前後のトリクロロエチレン濃度を分析した結果 トリクロロエチレン濃度 試験前 ０．０７２ｍｇ／Ｌ 試験後 ０．０１６ｍｇ／Ｌ （測定法：昭和４８年環境庁告示第３号別表３） このように、土中のトリクロロエチレンもオゾンによる
酸化除去が可能であった。Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows the configuration of the present invention. (B) A ozone-injection pipe (3) is driven into the contaminated part (4) of the soil (9), ozone gas is injected by the ozone generator (1), and trichlorethylene existing in the soil is oxidized by ozone to dissolve the water-soluble substance. Change to. (B) The water injection pipe (12) is used to inject water into the soil (9) to dissolve soluble organic substances, and the water / gas discharge pipe (11)
The trichlorethylene contained in the soil (9) is removed by pumping it above the ground. The present invention is configured as described above, and the test and experimental results are as follows. (A) <Basic reaction test of ozone and trichlorethylene> Two samples were prepared by dispensing trichlorethylene into a sealed bag having gas barrier properties. About 10 ozone as a test area
Air having a concentration of 00 ppm was enclosed, while only air was enclosed in the same volume as the target section. After 1 hour, both trichlorethylene concentrations were measured by a detector tube. As a result, trichlorethylene was not detected in the test section, and the concentration in the target section was detected which was almost commensurate with the injection amount of trichlorethylene. As a result of the request test, the concentration of trichlorethylene is 1 / of the target area.
Only 100 or less was detected, demonstrating the support of the basic test and demonstrating that ozone can decompose trichlorethylene. (B) <Ozone Decomposition Experiment of Trichlorethylene Remaining in Soil> A certain plating company conducted an experiment to ozone-oxidize a trace amount of trichlorethylene remaining in the ground 1M from the ground surface. A pipe having an air hole at its tip was filled to a depth of 1M, and ozone air was continuously injected from above. Results of analysis of trichlorethylene concentration before and after test Trichlorethylene concentration Before test 0.072 mg / L After test 0.016 mg / L (Measurement method: Showa 48 Environmental Agency Notification No. 3, Appendix 3) Oxidation removal by ozone was possible.
【０００７】[0007]
（イ） ＜除去時間の短縮＞ トリクロロエチレンは沸点が高いため、従来の真空抽出
法では土壌中より脱着が十分でなく、除去に長時間を要
する。本発明によれば、オゾンを直接トリクロロエチレ
ンに接触分解することで水溶性有機物に転換し、水に溶
け込ませることで、より短時間に土壌中より抽出するこ
とができる。 （ロ） ＜処理コストの減少＞ 装置が簡単で、しかも工期が短縮できることにより、従
来価額と比べて大幅にコストダウンが可能となる。 （ハ） ＜汚染の拡散防止＞ 工期短縮により、外部への汚染拡散を食い止めることが
できる。 （ニ） ＜技術的な展開の可能性＞ 本発明を応用すれば、土壌中に存在する他の有機汚染物
質の分解処理にも技術的な展開が図れる。(A) <Reduction of removal time> Since trichlorethylene has a high boiling point, desorption is not sufficient in the conventional vacuum extraction method from the soil, and it takes a long time to remove it. According to the present invention, ozone can be extracted from the soil in a shorter time by directly catalytically decomposing trichlorethylene to convert it into a water-soluble organic substance and dissolving it in water. (B) <Reduction of processing cost> The equipment is simple and the construction period can be shortened, so that the cost can be significantly reduced compared to the conventional price. (C) <Prevention of diffusion of pollution> By shortening the construction period, it is possible to prevent the diffusion of pollution to the outside. (D) <Possibility of technological development> By applying the present invention, technological development can be achieved for decomposition treatment of other organic pollutants existing in soil.
【図１】本発明の構成を示したものである。FIG. 1 shows a configuration of the present invention.
１ オゾン発生装置 ２ コンプレッサー ３ オゾン圧入管 ４ 汚染部 ５ ろ過槽 ６ 触媒塔 ７ 吸着塔 ８ 排出ポンプ ９ 土壌 １０ 粘土層 １１ 水・ガス排出管 １２ 水注入管 １３ 注水ポンプ １４ 水タンク 1 Ozone generator 2 Compressor 3 Ozone injection pipe 4 Contaminated part 5 Filtration tank 6 Catalyst tower 7 Adsorption tower 8 Discharge pump 9 Soil 10 Clay layer 11 Water / gas discharge pipe 12 Water injection pipe 13 Water injection pump 14 Water tank
Claims (1)
トラクロロエチレン等の有機塩素系化合物に対してオゾ
ンを反応、酸化させることにより水溶性化合物とし、土
壌中より水洗浄により除去することを特徴とする、有機
塩素系化合物による土壌汚染の除去方法。1. A water-soluble compound obtained by reacting and oxidizing ozone with an organic chlorine-based compound such as trichlorethylene or tetrachloroethylene that has penetrated into the soil, and is removed from the soil by washing with water. Method for removing soil contamination by chlorine compounds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5065873A JPH06238260A (en) | 1993-02-15 | 1993-02-15 | Removal of soil contamination with organochlorine compound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5065873A JPH06238260A (en) | 1993-02-15 | 1993-02-15 | Removal of soil contamination with organochlorine compound |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06238260A true JPH06238260A (en) | 1994-08-30 |
Family
ID=13299538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5065873A Pending JPH06238260A (en) | 1993-02-15 | 1993-02-15 | Removal of soil contamination with organochlorine compound |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06238260A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1003787C2 (en) * | 1996-08-12 | 1998-02-20 | Blue Fish Chemicals & Consulta | Ozone generator for sterilising soil |
| 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 |
| JP2003053318A (en) * | 2001-08-23 | 2003-02-25 | Sanee Industrial Co Ltd | Soil treatment equipment |
| US7537706B2 (en) * | 1995-05-05 | 2009-05-26 | Thinkvillage-Kerfoot, Llc | Microporous diffusion apparatus |
| JP2018061915A (en) * | 2016-10-11 | 2018-04-19 | 株式会社沙羅 | Purification method of contaminated ground |
| CN111266399A (en) * | 2018-12-04 | 2020-06-12 | 泉州泉港绿笛生态农业有限公司 | Efficient ozone treatment device and method for repairing organic contaminated soil |
-
1993
- 1993-02-15 JP JP5065873A patent/JPH06238260A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7537706B2 (en) * | 1995-05-05 | 2009-05-26 | Thinkvillage-Kerfoot, Llc | Microporous diffusion apparatus |
| NL1003787C2 (en) * | 1996-08-12 | 1998-02-20 | Blue Fish Chemicals & Consulta | Ozone generator for sterilising soil |
| 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 |
| JP2003053318A (en) * | 2001-08-23 | 2003-02-25 | Sanee Industrial Co Ltd | Soil treatment equipment |
| JP2018061915A (en) * | 2016-10-11 | 2018-04-19 | 株式会社沙羅 | Purification method of contaminated ground |
| CN111266399A (en) * | 2018-12-04 | 2020-06-12 | 泉州泉港绿笛生态农业有限公司 | Efficient ozone treatment device and method for repairing organic contaminated soil |
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