JP2005279549A - Method for decontaminating contaminated ground water - Google Patents

Method for decontaminating contaminated ground water Download PDF

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JP2005279549A
JP2005279549A JP2004099965A JP2004099965A JP2005279549A JP 2005279549 A JP2005279549 A JP 2005279549A JP 2004099965 A JP2004099965 A JP 2004099965A JP 2004099965 A JP2004099965 A JP 2004099965A JP 2005279549 A JP2005279549 A JP 2005279549A
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well
oil
suction pipe
suction
pumping
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JP4320609B2 (en
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Takaaki Shinohara
隆明 篠原
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Kurita Water Industries Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To efficiently decontaminate the ground water contaminated with oil by selectively/efficiently recovering the oil floating in the upper part of an aquifer. <P>SOLUTION: The oil floating in the upper part of the aquifer is sucked/removed by a suction pipe 2 inserted into a well 1 arranged in the aquifer. The suction pipe 2 is disposed so that a suction port 2a of the suction pipe 2 is positioned at or above an oil level in the atmospheric pressure in the well 1. The internal pressure of the well 1 is reduced by sucking the well by the suction pipe 2. As a result, the oil in the surrounding soil can be made to flow in the well 1 and sucked/discharged by the suction pipe 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は汚染地下水の浄化方法に係り、特に帯水層上部に浮遊する油分を、この帯水層に達するように設けた井戸を介して除去するようにした汚染地下水の浄化方法に関する。   The present invention relates to a method for purifying contaminated groundwater, and more particularly to a method for purifying contaminated groundwater in which oil components floating above the aquifer are removed through a well provided to reach the aquifer.

従来、油分で汚染された地下水を原位置で浄化する方法としては、
（１） 揚水井戸を設け、油を地下水と共に揚水することにより回収する方法
（２） 高真空抽出、或いは高真空抽出と揚水との組み合せで油を回収する方法
などがある。上記（１）の方法は、油層と共に大量の地下水を揚水することにより、帯水層上に浮遊している油分をポンプで吸い上げる方法である。特開２００１−２９５４５号公報には、この地下水の吸い上げと、帯水層中への高圧空気の注入とを組み合わせて、油の回収効率を高めることが記載されている。 Conventionally, as a method of purifying groundwater contaminated with oil in situ,
(1) A method of recovering oil by providing a pumping well and pumping oil together with groundwater (2) A method of recovering oil by high vacuum extraction or a combination of high vacuum extraction and pumping. The method (1) is a method of pumping up oil components floating on the aquifer by pumping a large amount of groundwater together with the oil reservoir. Japanese Patent Application Laid-Open No. 2001-29545 describes that the oil recovery efficiency is improved by combining the suction of the groundwater and the injection of high-pressure air into the aquifer.

また、上記（２）の方法における真空抽出は、土壌中の揮発性の汚染物質や汚染地下水、浮上油層の回収を目的として行われている。
特開２００１−２９５４５号公報 The vacuum extraction in the method (2) is performed for the purpose of collecting volatile pollutants, contaminated groundwater, and floating oil layers in the soil.
JP 2001-29545 A

水よりも比重の軽い油分を回収して地下水を浄化する場合、上記（１）の揚水による方法では、大量の地下水を揚水する必要があり、このため、揚水した大量の水の処理が必要となる。従って、揚水コスト、処理コストが高くつく上に、大量の地下水を揚水することによる地盤沈下が懸念される。   When purifying groundwater by collecting oil with a lighter specific gravity than water, the method of pumping in (1) above requires pumping a large amount of groundwater, which requires treatment of a large amount of pumped water. Become. Therefore, pumping costs and treatment costs are high, and there is a concern about land subsidence caused by pumping a large amount of groundwater.

また、上記（２）の真空抽出も、ガスや汚染地下水の吸引を主目的としており、油分と共に大量の地下水を吸引することとなり、上記（１）の場合と同様の問題がある。   In addition, the vacuum extraction of (2) is mainly aimed at sucking gas and contaminated groundwater, and a large amount of groundwater is sucked together with oil, and there is a problem similar to the case of (1).

本発明は、上記従来の問題点を解決し、帯水層上部に浮遊する油分を水とは別個に効率的に回収する方法を提供することを目的とする。   An object of the present invention is to solve the above-mentioned conventional problems and to provide a method for efficiently recovering oil components floating above the aquifer separately from water.

本発明の汚染地下水の浄化方法は、地中の帯水層上部に浮遊する油分を、該帯水層に達する井戸に差し込まれた吸引管で吸引して取り出すようにした汚染地下水の浄化方法において、該吸引管の吸引口が、該井戸内の大気圧条件下での油面又は該油面より上方に位置するように該吸引管を設け、該吸引管を介して該井戸内の空気を吸引排出して該井戸内を減圧し、帯水層から油分を該井戸に流入させ、この油分を該吸引管によって吸い出すことを特徴とするものである。   The method for purifying contaminated groundwater according to the present invention is a method for purifying contaminated groundwater in which oil floating in the upper part of the aquifer in the ground is sucked out by a suction pipe inserted into a well reaching the aquifer. The suction pipe is provided so that the suction port of the suction pipe is located above the oil level under the atmospheric pressure condition in the well or above the oil level, and the air in the well is passed through the suction pipe. The well is decompressed, the inside of the well is depressurized, oil is introduced from the aquifer into the well, and the oil is sucked out by the suction pipe.

このように吸引管の吸引口を、井戸内の大気圧条件下での油面（以下「静油面」と称す場合がある。）又は静油面より上方に設け、この吸引管により井戸内を吸引して減圧とすることにより、帯水層上部に浮遊する油分を効率的に回収することができる。即ち、井戸内を吸引して減圧することにより、井戸の周囲土壌から油がこの井戸内に流入する。そこで、この井戸内の油分を吸引管で吸い上げる。これにより、多量の地下水を吸い上げることなく、帯水層上の油分を選択的に吸引して回収することができる。   In this way, the suction port of the suction pipe is provided above the oil level in the well under the atmospheric pressure condition (hereinafter sometimes referred to as “hydrostatic surface”) or above the static oil level, and the suction pipe provides the inside of the well. By sucking and reducing the pressure, the oil component floating above the aquifer can be efficiently recovered. That is, when the inside of the well is sucked and depressurized, oil flows into the well from the soil around the well. Therefore, the oil in the well is sucked up by a suction pipe. Thereby, the oil on the aquifer can be selectively sucked and collected without sucking up a large amount of groundwater.

本発明においては、井戸内の水層に達するように揚水管を差し込み、この揚水管による地下水の揚水と、吸引管による吸引とを行うようにしてもよい。このようにすると、井戸内の水位が低下し、周囲土壌から井戸内に油分が流れ込み易くなる。   In the present invention, a pumping pipe may be inserted so as to reach the water layer in the well, and groundwater pumping by the pumping pipe and suction by the suction pipe may be performed. If it does in this way, the water level in a well will fall and it will become easy for oil to flow into a well from surrounding soil.

本発明において、吸引管による吸引で井戸内を−５００〜−５００００Ｐａ程度に減圧することが好ましい。   In the present invention, the inside of the well is preferably decompressed to about −500 to −50000 Pa by suction with a suction tube.

また、吸引管の吸引口は静油面より０〜４０ｃｍに位置するように設けることが好ましい。   In addition, the suction port of the suction tube is preferably provided so as to be located 0 to 40 cm from the hydrostatic surface.

本発明の汚染地下水の浄化方法によれば、帯水層上部に浮遊する油分を、この帯水層に設けた井戸に吸引管を差し込み、この吸引管により選択的かつ効率的に回収して汚染地下水を効率的に浄化することができる。本発明によれば、油分と共に大量の地下水を吸引することがないため、排水処理、地盤沈下の問題がなく、また、浄化期間を大幅に短縮すると共に、浄化コストを低減することができる。   According to the method for purifying contaminated groundwater of the present invention, the oil floating in the upper part of the aquifer is inserted into a well provided in the aquifer and a suction pipe is selectively and efficiently recovered by this suction pipe to contaminate Groundwater can be purified efficiently. According to the present invention, since a large amount of groundwater is not sucked together with oil, there is no problem of wastewater treatment and land subsidence, and the purification period can be greatly shortened and the purification cost can be reduced.

なお、油としては、具体的には原油、重油、軽油、灯油、ガソリン、機械油などの鉱物油、ベンゼン・トルエン・キシレン等の石油由来の化学製品、植物油などが挙げられるがこれに限定されるものではない。   Specific examples of oils include, but are not limited to, mineral oils such as crude oil, heavy oil, light oil, kerosene, gasoline, and machine oil, chemical products derived from petroleum such as benzene, toluene, and xylene, and vegetable oils. It is not something.

以下に図面を参照して本発明の汚染地下水の浄化方法の実施の形態を詳細に説明する。   Embodiments of a method for purifying contaminated groundwater according to the present invention will be described below in detail with reference to the drawings.

図１，２は本発明の汚染地下水の浄化方法の実施の形態を示す断面図である。図１，２において同一機能を奏する部材には同一符号を付してある。   1 and 2 are sectional views showing an embodiment of the method for purifying contaminated groundwater of the present invention. 1 and 2, members having the same functions are denoted by the same reference numerals.

図１は、帯水層に達するように設けられた井戸１に吸引管２を差し込み、吸引管２で井戸１内を吸引して減圧すると共に、吸引管２の吸引口から油を吸引して回収する方法を示すものである。この吸引管２は、井戸１内への差し込み深さが調整可能となっている。図１において、Ｌ１は地盤の地面を示し、Ｌ２は土中の油面、Ｌ３は帯水層の水面を示す。 In FIG. 1, a suction pipe 2 is inserted into a well 1 provided to reach an aquifer, the inside of the well 1 is sucked and decompressed by the suction pipe 2, and oil is sucked from the suction port of the suction pipe 2. The method of collection | recovery is shown. The suction pipe 2 can be adjusted in the depth of insertion into the well 1. In FIG. 1, L 1 indicates the ground surface, L 2 indicates the oil level in the soil, and L 3 indicates the water level of the aquifer.

井戸１には、吸引管による吸引で内部が減圧となるように、蓋３が設けられている。   The well 1 is provided with a lid 3 so that the inside is decompressed by suction with a suction tube.

吸引管２の下端は開放して吸引口２ａとされている。   The lower end of the suction pipe 2 is opened to serve as a suction port 2a.

この吸引管２の地上部分は、センサ６を介して図示しない減圧装置に接続されている。このセンサ６は吸引管２の油の吸引の有無を検知するセンサである。このセンサ６としては、電気伝導度計、粘度計、光学センサ（濁度、赤外吸収など）を用いることができる。   The ground portion of the suction pipe 2 is connected to a decompression device (not shown) via a sensor 6. This sensor 6 is a sensor that detects whether or not the suction pipe 2 is sucking oil. As this sensor 6, an electric conductivity meter, a viscometer, an optical sensor (turbidity, infrared absorption, etc.) can be used.

図１の方法では、吸引管２の下端の吸引口２ａを静油面（なお、この静油面は土壌中の油面Ｌ２とほぼ等しい。）よりも上方に位置させ（図１（ａ））、この状態で吸引管２により井戸１内を吸引して減圧とする。これにより、井戸１内の油面が上昇して吸引管２の吸引口２ｂに達し（図１（ｂ））、該吸引管２を介して井戸内の油が吸引されて回収される。 In the method of FIG. 1, the lower end of the suction port 2a of the static oil level of the suction pipe 2 (Note that the static oil level is substantially equal. The oil surface L 2 in the soil) is positioned above the (FIG. 1 (a In this state, the inside of the well 1 is sucked by the suction pipe 2 to reduce the pressure. As a result, the oil level in the well 1 rises and reaches the suction port 2b of the suction pipe 2 (FIG. 1 (b)), and the oil in the well is sucked and collected through the suction pipe 2.

また、井戸１内が減圧されることにより、井戸１の周囲地盤から油が井戸１内に流入し、この油も吸引管２より吸引されて回収される。   Further, when the pressure in the well 1 is reduced, oil flows into the well 1 from the ground around the well 1, and this oil is also sucked from the suction pipe 2 and collected.

吸引管２による井戸１内の減圧の程度としては、油面が上昇して、吸引管２の吸引口２ｂに達し、この吸引口２ｂから油が効率的に回収される程度であれば良く、通常の場合、井戸１内の圧力が大気圧よりも１，０００〜１００，０００Ｐａ程度低くなるようにすることが好ましい。この範囲よりも弱い減圧条件では十分に油を吸引することができず、これよりも強い減圧条件とすることは、動力コスト等の面で不利である。   The degree of pressure reduction in the well 1 by the suction pipe 2 is not limited as long as the oil level rises and reaches the suction port 2b of the suction pipe 2, and oil is efficiently recovered from the suction port 2b. In a normal case, it is preferable that the pressure in the well 1 be lower by about 1,000 to 100,000 Pa than the atmospheric pressure. Oil cannot be sufficiently sucked under a decompression condition weaker than this range, and it is disadvantageous in terms of power cost and the like to make the decompression condition stronger than this.

また、吸引管２の吸引口２ａの位置は、井戸１の径、井戸１内の減圧の程度、処理対象土壌の透水性（土壌内の油の移動し易さ）等に応じて適宜決定されるが、通常の場合、静油面から０〜４０ｃｍの位置、特に静油面から５〜２５ｃｍの上方位置とすることが好ましい。   The position of the suction port 2a of the suction pipe 2 is appropriately determined according to the diameter of the well 1, the degree of decompression in the well 1, the water permeability of the soil to be treated (ease of movement of oil in the soil), and the like. However, in a normal case, the position is preferably 0 to 40 cm from the hydrostatic surface, and more preferably 5 to 25 cm above the hydrostatic surface.

本発明においては、吸引管２からの油の回収の有無をセンサ６により確認し、吸引管２から油が回収されず、吸引管２内を空気のみが流通するような状態になった場合には、吸引管２の吸引口２ｂの位置を若干下降させ、油を吸引するようにすることが好ましい。   In the present invention, the presence or absence of oil recovery from the suction pipe 2 is confirmed by the sensor 6, and when no oil is recovered from the suction pipe 2 and only air flows through the suction pipe 2. It is preferable to slightly lower the position of the suction port 2b of the suction pipe 2 so as to suck oil.

次に、図２に示す汚染地下水の浄化方法について説明する。   Next, a method for purifying contaminated groundwater shown in FIG. 2 will be described.

図２に示す方法は、井戸１にさらに揚水管７を設け、揚水管７による揚水と吸引管２による吸引とを行う点が図１に示す方法と異なり、その他は同様に実施される。この揚水管７の下端には揚水ポンプ８が設けられている。   The method shown in FIG. 2 is different from the method shown in FIG. 1 in that a pumping pipe 7 is further provided in the well 1 and pumping by the pumping pipe 7 and suction by the suction pipe 2 are performed. A pumping pump 8 is provided at the lower end of the pumping pipe 7.

この図２に示す方法においては、揚水管７で井戸１内の水を揚水して井戸内の水位を下げると共に、図１に示す方法と同様に、吸引管２からの吸引で井戸１内を減圧する（図２（ａ））。これにより、井戸１の周囲地盤から油が井戸１内に流入し、井戸１内の油面が上昇して吸引管２により吸引される。   In the method shown in FIG. 2, the water in the well 1 is pumped by the pumping pipe 7 to lower the water level in the well, and the inside of the well 1 is sucked from the suction pipe 2 as in the method shown in FIG. The pressure is reduced (FIG. 2 (a)). Thereby, oil flows into the well 1 from the surrounding ground of the well 1, and the oil level in the well 1 rises and is sucked by the suction pipe 2.

この図２の方法によると、揚水管７から揚水して、井戸１内の水面を下げることにより、井戸１の周囲土壌の油をより一層効率的に井戸１内に移動させることができるようになり、油の回収効率が向上する。この場合、揚水管７による揚水量は、井戸１内の水位を下げるための量であり、従来の油回収のために油と共に水を揚水する場合に比べて著しく少ない量で良く、排水処理、地盤沈下等の問題はない。また、この揚水は連続的に行う他、間欠的に行っても良い。   According to the method of FIG. 2, the oil in the surrounding soil of the well 1 can be moved into the well 1 more efficiently by pumping the water from the pumping pipe 7 and lowering the water surface in the well 1. Thus, the oil recovery efficiency is improved. In this case, the amount of water pumped by the pumping pipe 7 is an amount for lowering the water level in the well 1, and may be much smaller than the case of pumping water together with oil for conventional oil recovery. There are no problems such as land subsidence. Moreover, this pumping may be performed intermittently in addition to continuously.

以下に実施例を挙げて本発明をより具体的に説明する。   Hereinafter, the present invention will be described more specifically with reference to examples.

実施例１
潤滑油で汚染された地盤中の地下水を図２の方法により浄化した。この地盤では、地下帯水層上に飽和濃度の油が油層を形成しており、油層の範囲は直径１５ｍ、油層の厚みは０．４〜０．９ｍであった。帯水層の水面Ｌ３は地下２〜２．５ｍの深さ位置であった。 Example 1
The groundwater in the ground contaminated with lubricating oil was purified by the method shown in FIG. In this ground, oil of saturated concentration formed an oil layer on the underground aquifer, the range of the oil layer was 15 m in diameter, and the thickness of the oil layer was 0.4 to 0.9 m. Water surface L 3 of the aquifer was depth position of the underground 2～2.5M.

図２に示す如く、この油層を貫くように深さ７ｍの井戸を設け、吸引管と揚水管とを差し込んだ。この井戸は１．５ｍから深度７ｍまでの全スクリーン井戸とした。   As shown in FIG. 2, a well having a depth of 7 m was provided so as to penetrate the oil layer, and a suction pipe and a pumping pipe were inserted. This well was a full screen well from 1.5 m to a depth of 7 m.

この井戸から揚水管から揚水量４ｍ３／ｈで地下水の揚水のみを行った場合は、油の回収速度は０．８Ｌ／ｈであった。 When only the groundwater was pumped from the well at a pumping rate of 4 m 3 / h from the pumping pipe, the oil recovery rate was 0.8 L / h.

そこで、本発明に従って、揚水量０．６ｍ３／ｈで揚水管で揚水を行うと共に、吸引管による吸引で井戸内圧力を−９０００Ｐａの減圧とし、吸引管の吸引口の位置を種々変えて、油の吸引回収を行った。 Therefore, according to the present invention, the pumping water is pumped at a pumping amount of 0.6 m 3 / h, and the pressure in the well is reduced to −9000 Pa by suction by the suction pipe, and the position of the suction port of the suction pipe is changed variously. Oil was collected by suction.

このときの油の回収速度は図３に示す通りであり、静油面又は静油面よりも上方に吸引管を設けて井戸内を吸引することにより、揚水のみを行う場合と比べて、揚水量を大幅に低減した上で、油の回収速度を最大で５倍程度にまで高めることができることが確認された。   The oil recovery speed at this time is as shown in FIG. 3. Compared with the case where only the pumping is performed by providing a suction pipe above the hydrostatic surface or above the hydrostatic surface and sucking the inside of the well. It was confirmed that the oil recovery rate can be increased up to about 5 times while the amount is greatly reduced.

本発明の汚染地下水の浄化方法の実施の形態を示す断面図である。It is sectional drawing which shows embodiment of the purification method of the contaminated groundwater of this invention. 本発明の汚染地下水の浄化方法の他の実施の形態を示す断面図である。It is sectional drawing which shows other embodiment of the purification method of the contaminated groundwater of this invention. 実施例における静油面から吸引管の吸引口の高さ位置と油回収速度との関係を示すグラフである。It is a graph which shows the relationship between the height position of the suction opening of a suction pipe from the static oil surface in an Example, and oil recovery speed.

符号の説明Explanation of symbols

１ 井戸
２ 吸引管
２ａ 吸引口
３ 蓋
６ センサ
７ 揚水管
８ 水中ポンプ 1 well 2 suction pipe 2a suction port 3 lid 6 sensor 7 pumping pipe 8 submersible pump

Claims (4)

地中の帯水層上部に浮遊する油分を、該帯水層に達する井戸に差し込まれた吸引管で吸引して取り出すようにした汚染地下水の浄化方法において、
該吸引管の吸引口が、該井戸内の大気圧条件下での油面又は該油面より上方に位置するように該吸引管を設け、
該吸引管を介して該井戸内の空気を吸引排出して該井戸内を減圧し、帯水層から油分を該井戸に流入させ、
この油分を該吸引管によって吸い出すことを特徴とする汚染地下水の浄化方法。 In the purification method of contaminated groundwater, the oil floating in the upper part of the aquifer in the ground is sucked out by a suction pipe inserted into the well reaching the aquifer.
The suction pipe is provided so that the suction port of the suction pipe is positioned above or below the oil level in the well under atmospheric pressure conditions,
The air in the well is sucked and discharged through the suction pipe to depressurize the well, and the oil component flows from the aquifer into the well.
A method for purifying contaminated groundwater, wherein the oil is sucked out by the suction pipe. 請求項１において、該井戸内の水層に達するように揚水管を差し込み、該揚水管による地下水の揚水と前記吸引管による吸引とを行うことを特徴とする汚染地下水の浄化方法。   The method for purifying contaminated groundwater according to claim 1, wherein a pumping pipe is inserted so as to reach the water layer in the well, and pumping of groundwater by the pumping pipe and suction by the suction pipe are performed. 請求項１又は２において、該吸引管による吸引で井戸内を−１，０００〜−１００，０００Ｐａに減圧することを特徴とする汚染地下水の浄化方法。   3. The method for purifying contaminated groundwater according to claim 1, wherein the inside of the well is depressurized to −1,000 to −100,000 Pa by suction by the suction pipe. 請求項１ないし３のいずれか１項において、該吸引管の吸引口を、該井戸内の大気圧条件下での油面から０〜４０ｃｍの位置に設けることを特徴とする汚染地下水の浄化方法。   The method for purifying contaminated groundwater according to any one of claims 1 to 3, wherein the suction port of the suction pipe is provided at a position of 0 to 40 cm from the oil level under atmospheric pressure in the well. .
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103221202A (en) * 2010-11-19 2013-07-24 横滨橡胶株式会社 Method for recovering puncture repair solution

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103221202A (en) * 2010-11-19 2013-07-24 横滨橡胶株式会社 Method for recovering puncture repair solution

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