JP2011147846A - Countermeasure to oil contamination comprising jetting/stirring oil dispersant at high pressure into oil-contaminated soil - Google Patents
Countermeasure to oil contamination comprising jetting/stirring oil dispersant at high pressure into oil-contaminated soil Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 41
- 238000003756 stirring Methods 0.000 title claims description 10
- 239000003924 oil dispersant Substances 0.000 title abstract description 6
- 238000011109 contamination Methods 0.000 title description 5
- 239000004568 cement Substances 0.000 claims abstract description 7
- 239000002781 deodorant agent Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 33
- 239000000463 material Substances 0.000 claims description 26
- 239000004533 oil dispersion Substances 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 238000010276 construction Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 5
- 238000011954 pollution control method Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 235000015097 nutrients Nutrition 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000004094 surface-active agent Substances 0.000 claims 1
- 241001478887 unidentified soil bacteria Species 0.000 claims 1
- 229920006395 saturated elastomer Polymers 0.000 abstract description 5
- 239000003795 chemical substances by application Substances 0.000 abstract description 2
- 229930195733 hydrocarbon Natural products 0.000 abstract description 2
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 2
- 239000004215 Carbon black (E152) Substances 0.000 abstract 1
- 238000004140 cleaning Methods 0.000 abstract 1
- 239000003208 petroleum Substances 0.000 abstract 1
- 238000000746 purification Methods 0.000 description 12
- 239000007789 gas Substances 0.000 description 6
- 238000011065 in-situ storage Methods 0.000 description 5
- 239000003673 groundwater Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000004848 polyfunctional curative Substances 0.000 description 3
- 239000002680 soil gas Substances 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000000769 gas chromatography-flame ionisation detection Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
本発明は、ガソリンスタンド等の油汚染土壌の浄化対策に関する。 The present invention relates to a purification measure for oil-contaminated soil such as a gas station.
土壌ガス吸引は、地下に存在する油分の揮発成分を、井戸などを減圧して土壌ガスを吸引することにより地中からガス態として抽出除去する方法である。地下水揚水や地中曝気などとの併用で適用範囲の拡大も行われ、また好気的な微生物分解を促進する目的で行われる事もある。この場合は油分中の揮発性を有しない成分もその対象となる。 Soil gas suction is a method of extracting and removing volatile components of oil existing in the underground as a gas state from the ground by sucking soil gas by depressurizing a well or the like. In combination with groundwater pumping, underground aeration, etc., the application range is expanded, and sometimes it is performed for the purpose of promoting aerobic microbial degradation. In this case, the component which does not have volatility in oil is also the object.
原位置バイオレメディエーション工法には、不飽和土層に存在する油含有土壌の浄化を対象としたバイオベンティング工法と、地下水以下の油含有土壌浄化を対象とした酸素供給工法がある。バイオベンティング工法は、不飽和層に井戸を設置し、吸気・送気を行う。また、栄養塩などを注入する。送気のさい蒸気を送付し油分の脱離・分解を促進させる場合もある。浄化期間は微生物の増殖速度に依存するため数ヶ月〜数年は必要である。 The in-situ bioremediation method includes a bioventing method for purifying oil-containing soils existing in unsaturated soil layers and an oxygen supply method for purifying oil-containing soils below groundwater. In the bioventing method, a well is installed in the unsaturated layer, and intake and air supply are performed. Also inject nutrients. In some cases, it is necessary to send steam to send air to promote oil desorption / decomposition. Since the purification period depends on the growth rate of microorganisms, it takes several months to several years.
特許文献１には、界面活性効果を持つ油分散剤を土壌に浸透させて土壌粒子の中に浸透した油分を遊離させる土壌の浄化方法が開示されている。 Patent Document 1 discloses a soil purification method in which an oil dispersant having a surface-active effect is permeated into soil to release the oil that has permeated into the soil particles.
特許文献２には、油に汚染された透水層の上流側に井戸を設け、地下水を加熱するとともに好気性化し、油の微生物分解を促進させる土壌の修復方法が開示されている。 Patent Document 2 discloses a soil repair method in which a well is provided on the upstream side of a permeable layer contaminated with oil to heat the groundwater and to make it aerobic, thereby accelerating microbial degradation of the oil.
特許文献３には、地下水面以下の飽和層に存在する油汚染個所の下部から注入井戸を通して空気を吹き込むと共に薬剤を注入し、油回収井戸により油分を回収して土壌中の汚染油濃度を十分に低下してから、化学酸化処理またはバイオレメディエーション処理を行って汚染油濃度を許容水準以下に低下させる原位置浄化方法が開示されている。 In Patent Document 3, air is blown through an injection well from a lower part of an oil-contaminated portion existing in a saturated layer below the groundwater surface, and a chemical is injected, and the oil content is recovered by the oil recovery well to sufficiently increase the concentration of contaminated oil in the soil. An in-situ purification method is disclosed in which a chemical oxidation process or a bioremediation process is performed to reduce the concentration of contaminated oil below an acceptable level.
特許文献４には、汚染土壌を原位置で洗浄した後、原位置でバイオ処理する浄化方法が開示されている。 Patent Document 4 discloses a purification method in which contaminated soil is washed in situ and then bioprocessed in situ.
特許文献５には、土壌中の汚染領域に到達するボーリング孔を掘削する工程と、掘削されたボーリング孔内に噴流噴射手段を先端に取付けた多重管を挿入する工程と、多重管の内部空間を介して噴流噴射手段から少なくとも２種類の流体を汚染領域に噴射する流体噴射工程とを含む浄化工法が開示されている。 Patent Document 5 discloses a step of excavating a borehole reaching a contaminated area in soil, a step of inserting a multiple pipe having a jet spray means attached to the tip of the excavated borehole, and an internal space of the multiple pipe And a fluid injection step of injecting at least two kinds of fluids into the contaminated area from the jet injection means.
ガソリンスタンド等にて発生している油汚染土壌に対しての汚染対策工法としては、掘削除去が主たる対策として実施されている。しかし、土壌汚染対策法の改正に伴い、掘削除去する場合には多くの制約が義務づけられた。また、原位置における対策として実施されている土壌ガス吸引工法では対象地盤が通気帯（不飽和帯）に限定され、なおかつ、揮発性を有する成分に限定される。また、バイオレメディエーション工法では不飽和帯と飽和帯では採用工法が異なり、なおかつ浄化まで数ヶ月から数年は必要となる。 As a pollution countermeasure method for oil-contaminated soil generated at a gas station or the like, excavation and removal are the main countermeasure. However, with the revision of the Soil Contamination Countermeasures Law, many restrictions have been imposed when excavating and removing. Moreover, in the soil gas suction method implemented as a countermeasure in situ, the target ground is limited to a ventilation zone (unsaturated zone), and is limited to a volatile component. In addition, in the bioremediation method, the adopted method is different between the unsaturated zone and the saturated zone, and it takes several months to several years until purification.
本発明が解決しようとする課題は、比較的小規模な設備にて,不飽和帯・飽和帯の区別なく、数日の短期間にて油汚染地盤の浄化を完了させる工法を提供することにある。 The problem to be solved by the present invention is to provide a method for completing the purification of oil-contaminated ground within a short period of several days without distinguishing between unsaturated zones and saturated zones in a relatively small facility. is there.
上記課題を解決すべく本発明に係る油汚染対策工法は、油汚染土壌に油分分散材を高圧で噴射する。高圧噴流体による運動エネルギーにて地盤の組織を破壊し、油分を含んだ土壌と油分分散材を強制的に混合撹拌する。油分が分散微細化されることにより油膜を除去する。さらに油分分散材に含まれる消臭剤にて油臭を中和する。 In order to solve the above-described problems, the oil pollution control method according to the present invention injects an oil-dispersing material at high pressure into oil-contaminated soil. The structure of the ground is destroyed by the kinetic energy generated by the high-pressure jet fluid, and the oil-containing soil and the oil dispersion material are forcibly mixed and stirred. The oil film is removed by dispersing and refining the oil. Further, the oily odor is neutralized with a deodorant contained in the oil dispersion material.
次に、油分分散材と油汚染土壌を混合撹拌した土壌に、さらにセメント系硬化材を高圧にて噴射し汚染土壌を硬化させる。それにより、一部残留している炭化水素を不溶化する。また、石油類地下タンクからの油分の再流出を防ぎ、再汚染を防止する。 Next, a cement-based hardener is sprayed at a high pressure to the soil obtained by mixing and stirring the oil dispersion material and the oil-contaminated soil, and the contaminated soil is hardened. This insolubilizes some remaining hydrocarbons. In addition, it prevents reflow of oil from oil underground tanks and prevents recontamination.
比較的小規模な設備にて,不飽和帯・飽和帯の区別なく、数日の短期間にて油汚染地盤の浄化を完了させることが可能となった。 With relatively small equipment, it became possible to complete the purification of oil-contaminated ground within a short period of a few days without distinguishing between unsaturated and saturated zones.
以下、図面を参照しつつ、本発明に係る工法の実施形態を説明する。 Hereinafter, embodiments of the construction method according to the present invention will be described with reference to the drawings.
図１は、油汚染土壌を鉛直面にて切断した断面を側方から見た断面図である。図１（ａ）は、ボーリングマシンにて造成管を計画深度まで削孔する工程を示す図である。図１（ｂ）は、油分分散材を高圧噴射しながら汚染土壌と混合撹拌する工程を示す図である。図１（ｃ）は、セメント系硬化材を高圧にて噴射させながら土壌を混合撹拌する工程を示す図である。 FIG. 1 is a cross-sectional view of a cross section of oil-contaminated soil cut along a vertical plane as viewed from the side. Fig.1 (a) is a figure which shows the process of drilling a creation pipe to a plan depth with a boring machine. FIG.1 (b) is a figure which shows the process of mixing and stirring with contaminated soil, spraying an oil-dispersing material at high pressure. FIG.1 (c) is a figure which shows the process of mixing and stirring soil, injecting a cement-type hardening material at high pressure.
第１工程（口元管設置工程）。まず、施工位置に口元管１０を設置する。
第２工程（造成管削孔工程）。次に、ボーリングマシン２０にて、造成管３０を計画深度まで削孔する。
第３工程（油分分散材高圧噴射工程）。造成管３０に設けた噴射口から油分分散材４０を高圧(20〜40MPa)にて噴射させながら汚染土壌と混合撹拌する。造成管３０を首振り運動させながら、引き抜きつつ、油分散材４０を高圧噴射することができる。このとき発生する泥土は、口元管１０より回収し、貯泥槽５０に送る。
第４工程（造成管再度挿入工程）油分散材高圧噴射工程の作業を計画範囲にて実施終了後、造成管３０を計画深度まで再度挿入する。
第５工程（硬化材高圧噴射工程）セメント系硬化材６０を高圧(20〜40MPa)にて噴射させながら汚染土壌を混合撹拌する。造成管３０を首振り運動させながら、引き抜きつつ、セメント系硬化材６０を高圧噴射することができる。このとき発生する泥土は、口元管１０より回収し、貯泥槽５０に送る。
以上、第１工程から第５工程までの作業を計画本数繰り返す。
1st process (mouth pipe installation process). First, the mouth pipe 10 is installed at the construction position.
Second step (prepared tube drilling step). Next, the bore 30 is drilled to the planned depth by the boring machine 20.
Third step (oil dispersion material high-pressure injection step). The oil dispersion material 40 is mixed and stirred with the contaminated soil while being sprayed at a high pressure (20 to 40 MPa) from an injection port provided in the forming pipe 30. The oil dispersion material 40 can be jetted at a high pressure while being pulled out while swinging the forming tube 30. The mud generated at this time is collected from the mouth pipe 10 and sent to the mud tank 50.
4th process (reforming tube re-insertion process) After completion | finishing the operation | work of an oil dispersion high-pressure injection process in a plan range, the restructuring tube 30 is reinserted to a planned depth.
Fifth step (hardening material high-pressure spraying step) The contaminated soil is mixed and stirred while the cement-based hardening material 60 is sprayed at a high pressure (20 to 40 MPa). The cement-based hardener 60 can be jetted at a high pressure while being pulled out while swinging the forming tube 30. The mud generated at this time is collected from the mouth pipe 10 and sent to the mud tank 50.
The work from the first process to the fifth process is repeated as many times as described above.
図２は、試験実施のために設けた油汚染模擬地盤の様子を示す概念図である。油汚染模擬地盤として2.0ｍ×2.0ｍの穴を深さ3.0ｍ掘削する。
GL-2.0〜3.0ｍ区間（地下２メートルから３メートルの範囲)に軽油を650リットル投入し土砂と撹拌し締め固める。
GL-1.0〜2.0ｍ区間（地下１メートルから２メートルの範囲）に軽油を350リットル投入し土砂と撹拌し締め固める。
表１に油汚染模擬地盤の性状を示す。
FIG. 2 is a conceptual diagram showing the state of the oil pollution simulated ground provided for conducting the test. Drill a 2.0m x 2.0m hole as a simulated oil pollution ground with a depth of 3.0m.
Add 650 liters of diesel oil to the GL-2.0-3.0m section (range from 2m to 3m underground), stir with earth and sand and compact.
Add 350 liters of diesel oil to the GL-1.0-2.0m section (range from 1m to 2m underground), stir with earth and sand and compact.
Table 1 shows the properties of the oil pollution simulated ground.
油汚染模擬地盤に使用する浄化材料の地盤への添加量を表２に示す。 Table 2 shows the amount of purification material added to the ground for simulated oil contamination.
浄化工事に使用した材料の配合表を表３に示す。また、試験工事状況を図３の写真に示す。表３の油分分散材としては、名古屋市中区のワイエスピー株式会社が提供する「オイルメディ」（「オイルメディ」はワイエスピー社の商標）を用いることができる。この油分分散材は、完全水系の油処理剤であり、生分解性９９パーセント以上のものである。非イオン系界面活性剤を約４パーセント含む。天然植物由来の消臭剤を配合している。また、土壌菌を増殖させる栄養剤をも含む。油分を分解、分散する効果を有する。 Table 3 shows the composition table of the materials used for the purification work. Moreover, the test construction status is shown in the photograph of FIG. As the oil dispersion material in Table 3, "Oil Medi" ("Oil Medi" is a trademark of Wythpee Corp.) provided by WPS Corporation of Naka-ku, Nagoya City can be used. This oil-dispersing material is a completely water-based oil treatment agent and has a biodegradability of 99% or more. Contains about 4 percent non-ionic surfactant. Contains deodorant derived from natural plants. It also contains nutrients for growing soil fungi. Has the effect of decomposing and dispersing oil.
試験結果は次のとおりである。 The test results are as follows.
「油臭、油膜」について
環境庁の油汚染対策ガイドラインによると、油臭・油膜の判定は人の感覚にて判断する。
そこで、事前（本発明に係る油対策工法の実施前）、泥土（油分分散材高圧噴射後）、硬化後（セメント系硬化材高圧噴射後）の油臭・油膜を観測した。試験結果を表４に示す。
“Oil odor, oil film” According to the guidelines for oil pollution countermeasures of the Environment Agency, the judgment of oil odor and oil film is judged by human sense.
Therefore, the oily odor and oil film were observed in advance (before the implementation of the oil countermeasure method according to the present invention), mud (after high-pressure injection of the oil dispersion material), and after hardening (after high-pressure injection of the cement-based hardening material). The test results are shown in Table 4.
TPH試験
油臭、油膜を定量化する試験として、ＧＣ−ＦＩＤ法（水素炎イオン化検出器付きガスクロマトグラフ）によるＴＰＨ（Total Petroleum Hydrocarbon）試験を実施した。炭素数により３つの画分に分け、炭素範囲ごとにクロマトグラムのピークパターンや濃度を比較することで同定を行う試験であり、油汚染対策ガイドラインに準拠するものである。その試験結果を表５に示す。
TPH test As a test for quantifying the oily odor and oil film, a TPH (Total Petroleum Hydrocarbon) test by the GC-FID method (gas chromatograph with a hydrogen flame ionization detector) was performed. This test is performed by dividing the sample into three fractions according to the number of carbon atoms and comparing the peak pattern and concentration of the chromatogram for each carbon range, and conforms to the Oil Contamination Countermeasure Guidelines. The test results are shown in Table 5.
このＴＰＨ試験により、浄化工事にてＴＰＨ値が１９％〜２６％程度に減少していることが認められた。 From this TPH test, it was found that the TPH value was reduced to about 19% to 26% in the purification work.
現在ガソリンスタンドである土地の土壌改良、過去においてガソリンスタンドであった場所の土壌改良、住宅地造成中に何らかの原因で油汚染が発見された場合の対策などに利用可能である。 It can be used for soil improvement of land that is currently a gas station, soil improvement of a place that was a gas station in the past, and countermeasures when oil contamination is discovered for some reason during the construction of a residential area.
１０ 口元管
２０ ボーリングマシン
３０ 造成管
４０ 油分分散材
５０ 貯泥槽
６０ セメント系硬化材
10 Mouth pipe 20 Boring machine 30 Preparation pipe 40 Oil dispersion material 50 Mud storage tank 60 Cement hardener
Claims (3)
該施工位置にボーリングマシンにて造成管を計画深度まで削孔する造成管削孔工程と、
該造成管に設けた噴射口から油分分散材を高圧にて噴射させながら汚染土壌と混合撹拌し、そのとき発生する泥土を前記口元管より回収し貯泥槽に送る油分分散材高圧噴射工程と、
を有し、前記汚染土壌の油分を分散・微細分することにより、油臭・油膜を除去する油汚染対策工法。 Mouth pipe setting process to install the mouth pipe at the construction position to take oil pollution countermeasures against oil contaminated soil,
A drilling process for drilling a pipe to a planned depth with a boring machine at the construction position;
An oil dispersion material high-pressure injection step of mixing and stirring the contaminated soil while injecting the oil dispersion material at a high pressure from an injection port provided in the forming pipe, collecting the mud generated at that time from the mouth pipe and sending it to the mud storage tank; ,
An oil pollution control method for removing oily odor and oil film by dispersing and finely dispersing oil in the contaminated soil.
前記油分分散材は、界面活性剤と、消臭剤と、土壌菌を増殖させる栄養剤とを含むことを特徴とする油汚染対策工法。 The oil pollution control method according to claim 1,
The oil-dispersing material includes a surfactant, a deodorant, and a nutrient for growing soil bacteria.
前記油分分散材高圧噴射工程にて油臭・油膜を除去した土壌に対し、
前記造成管を計画深度まで再度挿入する造成管再度挿入工程と、
該造成管に設けた噴射口からセメント等硬化材を高圧にて噴射させながら混合撹拌し、そのとき発生する泥土を前記口元管より回収し貯泥槽に送る硬化材高圧噴射工程と
をさらに有し、それにより前記土壌を硬化させることを特徴とする油汚染対策工法。 The oil pollution control method according to claim 1,
For the soil from which the oily odor and oil film have been removed in the oil dispersion material high-pressure injection process,
A re-insertion step of re-inserting the formation tube to the planned depth; and
A stiffening material high-pressure spraying step of collecting and stirring the hardened material such as cement from the spraying port provided in the forming pipe while being mixed and stirred, and collecting the mud generated at that time from the mouth pipe and sending it to the mud storage tank. An oil pollution control method characterized by curing the soil.
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| JP2021126640A (en) * | 2020-02-17 | 2021-09-02 | 清水建設株式会社 | Contaminated soil purification method by using high pressure injection agitation method |
Citations (3)
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|---|---|---|---|---|
| JP2002192142A (en) * | 2000-12-27 | 2002-07-10 | Fudo Constr Co Ltd | Method for cleaning polluted ground |
| JP2004225443A (en) * | 2003-01-24 | 2004-08-12 | Zenitaka Corp | Method of improving contaminated soil with high pressure jet |
| JP2008272549A (en) * | 2006-08-30 | 2008-11-13 | Chem Grouting Co Ltd | Polluted soil cleaning method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002192142A (en) * | 2000-12-27 | 2002-07-10 | Fudo Constr Co Ltd | Method for cleaning polluted ground |
| JP2004225443A (en) * | 2003-01-24 | 2004-08-12 | Zenitaka Corp | Method of improving contaminated soil with high pressure jet |
| JP2008272549A (en) * | 2006-08-30 | 2008-11-13 | Chem Grouting Co Ltd | Polluted soil cleaning method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021126640A (en) * | 2020-02-17 | 2021-09-02 | 清水建設株式会社 | Contaminated soil purification method by using high pressure injection agitation method |
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