JP2012239937A - System for processing contaminated soil and method for processing contaminated soil - Google Patents
System for processing contaminated soil and method for processing contaminated soil Download PDFInfo
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- JP2012239937A JP2012239937A JP2011109454A JP2011109454A JP2012239937A JP 2012239937 A JP2012239937 A JP 2012239937A JP 2011109454 A JP2011109454 A JP 2011109454A JP 2011109454 A JP2011109454 A JP 2011109454A JP 2012239937 A JP2012239937 A JP 2012239937A
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- contaminated soil
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- 239000002689 soil Substances 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000003792 electrolyte Substances 0.000 claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- 239000003673 groundwater Substances 0.000 claims abstract description 20
- 239000008151 electrolyte solution Substances 0.000 claims description 65
- 239000003344 environmental pollutant Substances 0.000 claims description 39
- 231100000719 pollutant Toxicity 0.000 claims description 39
- 239000000356 contaminant Substances 0.000 claims description 22
- 238000011084 recovery Methods 0.000 claims description 21
- 238000000926 separation method Methods 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000005868 electrolysis reaction Methods 0.000 claims description 17
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 claims description 13
- 238000011109 contamination Methods 0.000 abstract description 11
- 239000000126 substance Substances 0.000 abstract description 9
- 239000003921 oil Substances 0.000 description 39
- 239000007788 liquid Substances 0.000 description 11
- 239000007800 oxidant agent Substances 0.000 description 7
- 238000001179 sorption measurement Methods 0.000 description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 4
- 238000003672 processing method Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002480 mineral oil Substances 0.000 description 3
- 235000010446 mineral oil Nutrition 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- NPYPAHLBTDXSSS-UHFFFAOYSA-N Potassium ion Chemical compound [K+] NPYPAHLBTDXSSS-UHFFFAOYSA-N 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000011437 continuous method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229960001760 dimethyl sulfoxide Drugs 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- DKAGJZJALZXOOV-UHFFFAOYSA-N hydrate;hydrochloride Chemical compound O.Cl DKAGJZJALZXOOV-UHFFFAOYSA-N 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000002798 polar solvent Substances 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
Description
本発明は、鉱物油や化学物質などの有害物質に汚染された汚染土壌を処理する汚染土壌の処理システムおよび処理方法に係り、更に詳しくは、電解水を用いることによって、土壌に付着している汚染物質（特に油分）を遊離または分解することで処理する、汚染土壌の処理システムおよび処理方法に関するものである。
また、簡易な設備でありながら、汚染状況が高濃度、広範囲、高深度である場合においても効果的に土壌処理を行うことができる汚染土壌の処理システムおよび処理方法に関するものである。
The present invention relates to a contaminated soil treatment system and treatment method for treating contaminated soil contaminated with harmful substances such as mineral oil and chemical substances, and more particularly, by using electrolyzed water. The present invention relates to a contaminated soil treatment system and a treatment method for treating pollutants (particularly oil) by releasing or decomposing them.
In addition, the present invention relates to a contaminated soil treatment system and treatment method that can perform soil treatment effectively even when the pollution situation is high concentration, wide range, and high depth, even though it is a simple facility.
近年、工場やガソリンスタンドなどの跡地を再利用する際に、跡地の土壌が鉱物油などの油分やその他の化学物質に汚染されている場合があり、これら汚染土壌への対策が必要になっている。 In recent years, when the site of a factory or a gas station is reused, the soil of the site may be contaminated with oil such as mineral oil or other chemical substances, and measures against these contaminated soils are required. Yes.
従来からこれら汚染土壌に対する最も一般的な対策としては、汚染土壌の掘削除去による土壌の入れ替えがあるが、迅速な対応はできるものの、汚染土壌の搬出、汚染土壌の埋立処理、非汚染土壌の搬入が必要であることからコストが高くなるという問題があり、さらに汚染土壌自体を処理するものではないという欠点がある。 Conventionally, the most common countermeasures against these contaminated soils are exchanging the soil by excavating and removing the contaminated soil, but although it is possible to respond quickly, the removal of the contaminated soil, the landfill treatment of the contaminated soil, the import of the uncontaminated soil However, there is a problem that the cost is high, and there is a disadvantage that the contaminated soil itself is not treated.
そこで、土壌を入れ替えることなく汚染土壌自体を処理することが考えられており、例えば特許文献１には原位置バイオレメディエーションを利用する地下汚染修復方法や、特許文献２には記載の過酸化水素などの酸化剤を用いた汚染土壌浄化方法が開示されている。 Therefore, it is considered to treat the contaminated soil itself without replacing the soil. For example, Patent Document 1 discloses a method for repairing underground pollution using in-situ bioremediation, hydrogen peroxide described in Patent Document 2, and the like. A method for remediating contaminated soil using any oxidizing agent is disclosed.
ここで、原位置バイオレメディエーションとは、汚染土壌に直接、酸素や栄養素などを供給して汚染土壌中に存在している微生物を活性化することで土壌の処理を行うものであり、酸化剤を用いた土壌浄化方法とは、汚染土壌に過酸化水素などの酸化剤を散布し、酸化剤により油分を酸化分解することによって土壌の処理を行うものである。 Here, in-situ bioremediation is the treatment of soil by supplying oxygen, nutrients, etc. directly to the contaminated soil and activating microorganisms present in the contaminated soil. The soil purification method used is a method of treating soil by spraying an oxidizing agent such as hydrogen peroxide on contaminated soil and oxidatively decomposing oil with the oxidizing agent.
しかしながら、特許文献１に記載の原位置バイオレメディエーションを利用する土壌処理方法は、特許文献１の段落［０００１］、［０００７］、［０００８］にも記載されているように、汚染の程度が低濃度の汚染土壌に対しては効果的な処理方法であるものの、高濃度の汚染土壌においては有効な処理方法ではないという欠点がある。また、処理に長期間を要することやこれに伴い相応のコストもかかるという欠点もある。 However, as described in paragraphs [0001], [0007] and [0008] of Patent Document 1, the soil treatment method using in-situ bioremediation described in Patent Document 1 has a low degree of contamination. Although it is an effective treatment method for contaminated soil with a high concentration, there is a drawback that it is not an effective treatment method for contaminated soil with a high concentration. In addition, there is a drawback that a long time is required for the treatment and a corresponding cost is required.
また、特許文献２に記載の過酸化物などの酸化剤を用いた土壌処理方法は、酸化剤の反応が比較的速いことから酸化剤の到達範囲に限界があり、処理したい汚染土壌の汚染状況が広範囲であったり、深度が深かったりする場合には有効な処理方法ではないという欠点がある。さらに、化学反応を伴うことから作業時の安全対策を確保する必要があり、相応のコストもかかるという欠点がある。 In addition, the soil treatment method using an oxidizing agent such as peroxide described in Patent Document 2 has a limit in the reach of the oxidizing agent because the reaction of the oxidizing agent is relatively fast, and the contamination status of the contaminated soil to be treated However, there is a disadvantage that it is not an effective processing method in the case where the range is wide or the depth is deep. Furthermore, since it involves a chemical reaction, it is necessary to ensure safety measures at the time of work, and there is a disadvantage that it takes a corresponding cost.
本発明は、上記した従来の問題点に鑑みてなされたものであって、電解水を用いることによって、汚染土壌に付着している油分を土壌から遊離または分解することによって処理する汚染土壌の処理システムおよび処理方法を提供するものである。また、汚染状況が高濃度や広範囲や高深度である場合においても、効果的に土壌処理を行うことができる汚染土壌の処理システムおよび処理方法を提供するものである。 The present invention has been made in view of the above-described conventional problems, and uses contaminated soil to treat contaminated soil by treating oil by adhering to or decomposing oil adhering to the contaminated soil. A system and processing method are provided. It is another object of the present invention to provide a contaminated soil treatment system and treatment method that can effectively perform soil treatment even when the contamination state is high concentration, wide range, or high depth.
上記目的を達成するために、本発明の請求項１に係る汚染土壌の処理システムは、電解液製造手段と、電解液製造手段によって製造した電解液を汚染土壌に供給する電解液供給手段と、電解液によって汚染土壌から遊離または分解した汚染物質を含む電解液および／または地下水を回収する汚染物質回収手段とを備えることを特徴とする。 In order to achieve the above object, a contaminated soil treatment system according to claim 1 of the present invention comprises an electrolytic solution producing means, an electrolytic solution supplying means for supplying the electrolytic solution produced by the electrolytic solution producing means to the contaminated soil, It is characterized by comprising an electrolyte solution containing a contaminant released or decomposed from the contaminated soil by the electrolyte solution and / or a contaminant collection means for collecting groundwater.
本発明の請求項２に係る汚染土壌の処理システムは、汚染物質回収手段の後に、汚染物質と電解液および／または地下水とを分離する分離手段を備えることを特徴とする。 The processing system for contaminated soil according to claim 2 of the present invention is characterized in that a separation means for separating the contaminant from the electrolytic solution and / or groundwater is provided after the contaminant recovery means.
本発明の請求項３に係る汚染土壌の処理システムは、汚染物質回収手段の後に、汚染物質を含む電解液および／または地下水を電気分解処理する電気分解手段を備えることを特徴とする。 According to a third aspect of the present invention, there is provided a contaminated soil treatment system including, after the pollutant collecting means, an electrolyzing means for electrolyzing an electrolytic solution and / or groundwater containing the pollutant.
本発明の請求項４に係る汚染土壌の処理システムは、汚染土壌が、油分で汚染された土壌であることを特徴とする。 The contaminated soil treatment system according to claim 4 of the present invention is characterized in that the contaminated soil is soil contaminated with oil.
本発明の請求項５に係る汚染土壌の処理システムは、電解液が、次亜塩素酸を含む電解水であることを特徴とする。 The contaminated soil treatment system according to claim 5 of the present invention is characterized in that the electrolytic solution is electrolytic water containing hypochlorous acid.
本発明の請求項６に係る汚染土壌の処理方法は、電解液製造工程と、電解液製造工程によって製造した電解液を汚染土壌に供給する電解液供給工程と、供給した電解液によって汚染土壌から汚染物質を遊離または分解する汚染物質遊離分解工程と、汚染土壌から遊離または分解した汚染物質を含む電解液中および／または地下水を回収する汚染物質回収工程とを備えることを特徴とする。 The processing method of the contaminated soil which concerns on Claim 6 of this invention is an electrolyte solution manufacturing process, the electrolyte solution supply process which supplies the electrolyte solution manufactured by the electrolyte solution manufacturing process to contaminated soil, and the contaminated soil by the supplied electrolyte solution. It is characterized by comprising a pollutant free-decomposing step for liberating or decomposing pollutants, and a pollutant collecting step for recovering in the electrolyte and / or groundwater containing the pollutants liberated or decomposed from the contaminated soil.
本発明の請求項７に係る汚染土壌の処理方法は、汚染物質回収工程の後工程に、汚染物質と電解液および／または地下水とを分離する分離工程を備えることを特徴とする。 The processing method of the contaminated soil which concerns on Claim 7 of this invention is equipped with the isolation | separation process which isolate | separates a contaminant, electrolyte solution, and / or groundwater in the post process of a contaminant collection process.
本発明の請求項８に係る汚染土壌の処理方法は、汚染物質回収工程の後工程に、汚染物質を含む電解液および／または地下水を電気分解処理する電気分解工程を備えることを特徴とする。 The method for treating contaminated soil according to claim 8 of the present invention is characterized by including an electrolysis step of electrolyzing the electrolytic solution and / or groundwater containing the pollutant after the pollutant recovery step.
本発明に係る汚染土壌の処理システムおよび汚染土壌の処理方法によれば、電解液製造手段と電解液供給手段と汚染物質回収手段を備えているので、電解液によって土壌中の汚染物質（特に油分）を遊離または分解することができ、掘削除去法のように掘削作業を行うことなく広範囲の土壌の処理をすることができる。
また、原位置バイオレメディエーションのような微生物を用いる処理方法や酸化剤を用いる処理方法に比べて、高濃度、広範囲、高深度の汚染土壌にも適用が可能であり、安全に低コストで土壌処理を行うことができる。
According to the contaminated soil treatment system and the contaminated soil treatment method of the present invention, since the electrolytic solution manufacturing means, the electrolytic solution supply means, and the pollutant recovery means are provided, the contaminants (especially oil content) in the soil by the electrolytic solution are provided. ) Can be released or decomposed, and a wide range of soil can be treated without excavation work as in the excavation and removal method.
It can also be applied to contaminated soils at high concentrations, wide areas, and depths, compared to treatment methods that use microorganisms such as in-situ bioremediation and treatment methods that use oxidants. It can be performed.
また、分離手段を設けることによって、汚染処理後の回収液から油分や化学物質を分離した後、電解液として再利用することができる。また、汚染物質が油分である場合には汚染処理後の回収液から分離した油分も有価物として再利用することができる。 In addition, by providing a separation means, oil and chemical substances can be separated from the recovered liquid after the contamination treatment, and then reused as an electrolytic solution. Further, when the pollutant is an oil, the oil separated from the recovered liquid after the contamination treatment can be reused as a valuable resource.
また、電気分解手段を設けることによって、土壌中において分解しきれなかった汚染物質を確実に分解処理することができる。 Further, by providing the electrolysis means, it is possible to reliably decompose the contaminants that could not be decomposed in the soil.
さらに、次亜塩素酸を含む電解水を用いることによって、汚染物質をより確実に分解することができる。特に汚染物質が油分である場合には、二酸化炭素などに分解されることから無臭化を行うことができる。 Furthermore, the pollutant can be more reliably decomposed by using electrolyzed water containing hypochlorous acid. In particular, when the pollutant is oil, it is decomposed into carbon dioxide and the like, so that it can be debrominated.
本発明の実施形態を図面に基づいて説明する。尚、以下に述べる実施形態は本発明を具体化した一例に過ぎず、本発明の技術的範囲を限定するものでない。図１は本発明の汚染土壌の処理システムの一例を示す模式図である。 Embodiments of the present invention will be described with reference to the drawings. The embodiment described below is merely an example embodying the present invention, and does not limit the technical scope of the present invention. FIG. 1 is a schematic diagram showing an example of a contaminated soil treatment system of the present invention.
まず、図１に基づいて、本発明の汚染土壌の処理システム１の構成を説明する。
本発明の汚染土壌の処理システム１は、電解液製造手段２、電解液供給手段３、汚染物質回収手段４、およびこれらの手段の運転および稼働状況をモニタなどを通じて制御する制御手段（図示せず）を主要な構成要件として構成されている。
First, based on FIG. 1, the structure of the processing system 1 of the contaminated soil of this invention is demonstrated.
The contaminated soil treatment system 1 according to the present invention includes an electrolytic solution production means 2, an electrolytic solution supply means 3, a pollutant collection means 4, and control means (not shown) for controlling the operation and operating status of these means through a monitor or the like. ) Is a major component requirement.
次に、各手段の構成を説明する。 Next, the configuration of each means will be described.
（電解液製造手段）
電解液製造手段２は、電気分解槽５、電極６、電解質溶液７、電源８を主要な構成要件として構成されている。ここで、電解質溶液７に用いられる電解質および溶媒は、汚染物質の種類に応じて適宜選択することができ、例えば、電解質については電離することによってナトリウムイオン、カリウムイオン、カルシウムイオン、マグネシウムイオン、塩化物イオン、炭酸イオン、炭酸水素イオンなどに解離する化合物などを用いることができる。また、溶媒については水、アルコール、テトラヒドロフラン、アセトン、アセトニトリル、Ｎ，Ｎ−ジメチルホルムアミド、メチルスルホキシド、酢酸などの極性溶媒を用いることができる。
また、電極６についても、白金、金、ニッケル、ステンレス、セラミックなど各種の材質のものを使用することができる。
なお、電解液製造手段２は、印加されている電極６間に電解質溶液７を通過させることによって連続的に電解液９を製造する連続式と言われる方法だけでなく、一旦、電気分解槽５に電解質溶液７を入れた後に電気分解することによって電解液９を製造するバッチ式と言われる方法を用いることもできる。さらに、電解液の混合を防止するための隔膜（図示せず）を設けることもできる。
(Electrolyte production means)
The electrolytic solution manufacturing means 2 is configured with an electrolysis tank 5, an electrode 6, an electrolytic solution 7, and a power source 8 as main constituent elements. Here, the electrolyte and the solvent used for the electrolyte solution 7 can be appropriately selected according to the type of the contaminant. For example, the electrolyte is ionized to be sodium ion, potassium ion, calcium ion, magnesium ion, chloride. A compound that dissociates into a physical ion, a carbonate ion, a hydrogen carbonate ion, or the like can be used. As the solvent, polar solvents such as water, alcohol, tetrahydrofuran, acetone, acetonitrile, N, N-dimethylformamide, methyl sulfoxide, and acetic acid can be used.
Also, the electrode 6 can be made of various materials such as platinum, gold, nickel, stainless steel, and ceramic.
The electrolytic solution manufacturing means 2 is not limited to a continuous method in which the electrolytic solution 9 is continuously manufactured by passing the electrolytic solution 7 between the applied electrodes 6. It is also possible to use a so-called batch method in which the electrolytic solution 9 is produced by electrolyzing the electrolytic solution 7 after the electrolytic solution 7 is put into the container. Furthermore, a diaphragm (not shown) for preventing mixing of the electrolytic solution can be provided.
（電解液供給手段）
電解液供給手段３は、配管１０、ポンプ１１、スプレー１２または供給井戸１３を主要な構成要件として構成されており、電解液製造手段２によって製造された電解液９を汚染土壌１４に供給するものである。
ここで、供給の方法としては、スプレー１２によって地表面から電解液９を散布して地中に浸透させる方法でもよいし、汚染土壌１４の汚染状況に応じて適当な深さの供給井戸１３や供給管（図示せず）などを設けることによって、電解液９を地中に直接供給させる方法でもよい。
また、供給井戸１３や供給管の側面は、電解液９を汚染土壌１４に供給しやすいように通水性の材質で構成しておくことが好ましい。
(Electrolyte supply means)
The electrolyte supply means 3 is configured with the piping 10, the pump 11, the spray 12 or the supply well 13 as main components, and supplies the electrolyte 9 produced by the electrolyte production means 2 to the contaminated soil 14. It is.
Here, as a supply method, a method of spraying the electrolyte 9 from the ground surface by the spray 12 and infiltrating it into the ground may be used, or a supply well 13 having an appropriate depth according to the contamination status of the contaminated soil 14 may be used. A method of supplying the electrolytic solution 9 directly into the ground by providing a supply pipe (not shown) or the like may be used.
Further, the side surfaces of the supply well 13 and the supply pipe are preferably made of a water-permeable material so that the electrolytic solution 9 can be easily supplied to the contaminated soil 14.
（汚染物質回収手段）
汚染物質回収手段４は、回収井戸１５や回収管（図示せず）、配管１６、ポンプ１７、タンク１８を主要な構成要件として構成されており、汚染物質を含む電解液１９または地下水２０を地中からタンク１８に回収するものである。
ここで、回収井戸１５や回収管の深さは、汚染土壌１４の汚染状況に応じて適宜決定されるものであるが、電解液９によって汚染土壌１４から遊離した汚染物質を含む電解液１９は、その一部が帯水層２１にまで流れ込む場合があることから、帯水層２１にまで設けることが好ましい。
なお、回収井戸１５や回収管の側面は、供給井戸１３や供給管と同様に汚染物質を含む電解液１９または地下水２０を回収しやすいように通水性の材質で構成しておくことが好ましい。
(Pollutant collection means)
The pollutant recovery means 4 includes a recovery well 15, a recovery pipe (not shown), a pipe 16, a pump 17, and a tank 18 as main components, and the electrolytic solution 19 or groundwater 20 containing the pollutant is supplied to the ground. It is collected in the tank 18 from the inside.
Here, the depth of the recovery well 15 and the recovery pipe is appropriately determined according to the contamination status of the contaminated soil 14, but the electrolytic solution 19 containing the contaminant released from the contaminated soil 14 by the electrolytic solution 9 is In some cases, a part of the aquifer 21 may flow into the aquifer 21.
The side surfaces of the recovery well 15 and the recovery pipe are preferably made of a water-permeable material so that the electrolytic solution 19 or the groundwater 20 containing the pollutant can be easily recovered, like the supply well 13 and the supply pipe.
（分離手段）
また、本発明の汚染土壌の処理システム１には、汚染物質回収手段４の後に該回収手段によって回収した回収液である、汚染物質を含む電解液１９または地下水２０から主に油分を分離するための分離手段２２を設けることもできる。
ここで分離手段の具体例としては、図２に示すように、回収液２３中に分散している油分を粗粒化して浮上させる粗粒化装置２４、浮上油を回収するオイルスキマー２５、ポンプ２６、回収液を貯留することによって油分の分離を促進させるための分離槽２７、油分を吸着する吸着フィルター２８を備えた吸着槽２９などから構成されている。
なお、分離槽２７や吸着槽２９の槽数や配列については回収液２３の状態に応じて適宜設定すればよいが、より確実な分離を行うためには、図２に示すように分離槽２７については直列で４槽配置したユニットを１系列、吸着槽２９については直列で３槽配置したユニットを３系列設置することが好ましい。
(Separation means)
In the contaminated soil treatment system 1 of the present invention, oil is mainly separated from the electrolytic solution 19 or the groundwater 20 containing the pollutant, which is a collected liquid collected by the collecting means after the pollutant collecting means 4. The separating means 22 can also be provided.
Here, as specific examples of the separation means, as shown in FIG. 2, a coarsening device 24 for coarsening and floating the oil dispersed in the recovered liquid 23, an oil skimmer 25 for recovering the floating oil, a pump 26, a separation tank 27 for promoting the separation of oil by storing the recovered liquid, an adsorption tank 29 including an adsorption filter 28 for adsorbing the oil, and the like.
Note that the number and arrangement of the separation tanks 27 and the adsorption tanks 29 may be appropriately set according to the state of the recovered liquid 23. However, in order to perform more reliable separation, as shown in FIG. It is preferable to install one series of units arranged in four tanks in series and three series of units arranged in series three in the adsorption tank 29.
（電気分解手段）
さらに、本発明の汚染土壌の処理システム１には、汚染物質回収手段４の後に回収液２３に溶解または分散している油分またはその他の汚染物質をさらに分解するための電気分解手段３０を設けることもできる。
電気分解手段３０の構造は電解液製造手段２と同じであり、電気分解槽５、電極６、回収液２３、電源８を主要な構成要件として構成されている。また、電解液製造手段２と同様に連続式、バッチ式のいずれの方式を用いることができる。
なお、図１では電気分解手段３０が分離手段２２の後に配置されているが、電気分解手段３０と分離手段２２との配置の順序については、汚染物質回収手段４の後に配置されれば特に限定されず、電気分解手段３０を分離手段２２の前に配置してもよく、さらに分離手段２２を設けずに電気分解手段３０のみを配置することもできる。
(Electrolytic means)
Further, the contaminated soil treatment system 1 of the present invention is provided with an electrolysis means 30 for further decomposing oil or other pollutants dissolved or dispersed in the recovered liquid 23 after the pollutant collection means 4. You can also.
The structure of the electrolysis means 30 is the same as that of the electrolytic solution production means 2, and the electrolysis tank 5, the electrode 6, the recovered liquid 23, and the power source 8 are configured as main components. In addition, as with the electrolytic solution production means 2, either a continuous type or a batch type can be used.
In FIG. 1, the electrolysis means 30 is arranged after the separation means 22, but the order of arrangement of the electrolysis means 30 and the separation means 22 is particularly limited as long as it is arranged after the pollutant collection means 4. Instead, the electrolysis means 30 may be disposed in front of the separation means 22, and only the electrolysis means 30 may be disposed without providing the separation means 22.
次に、上記のように構成された汚染土壌の処理システム１の動作および作用を説明する。 Next, the operation and action of the contaminated soil treatment system 1 configured as described above will be described.
まず、電解液製造手段２によって電解液９が製造される。ここで、汚染物質が油分である場合には、油分を酸化分解させることができる点から塩化ナトリウム水溶液や塩酸水などの電気分解によって得られる、次亜塩素酸（ＨＯＣｌ）を含む電解水となるような電解質溶液７が用いられる。
具体的には、塩化ナトリウム水溶液を電気分解することで陽極と陰極において以下の反応などを経由することによって得られる、次亜塩素酸（ＨＯＣｌ）やヒドロキシラジカル（ＯＨ−）などを含む電解水が用いられる。なお、次亜塩素酸の含有量が多い、すなわち酸性を示すような電解水を用いると配管の腐食などの恐れがあることから、次亜塩素酸を含む電解水の中でも、いわゆる電解次亜水と呼ばれるｐＨが７．５以上の電解水を用いることが好ましい。
First, the electrolytic solution 9 is manufactured by the electrolytic solution manufacturing means 2. Here, when the pollutant is oil, it is electrolyzed water containing hypochlorous acid (HOCl) obtained by electrolysis of a sodium chloride aqueous solution or hydrochloric acid water from the point that the oil can be oxidatively decomposed. Such an electrolyte solution 7 is used.
Specifically, electrolyzed water containing hypochlorous acid (HOCl), hydroxy radical (OH − ), etc. obtained by electrolysis of an aqueous sodium chloride solution through the following reactions at the anode and cathode: Used. In addition, since there is a risk of corrosion of piping when using electrolyzed water that has a high content of hypochlorous acid, that is, shows acidity, so-called electrolytic hypochlorous acid is also included in electrolyzed water containing hypochlorous acid. It is preferable to use electrolyzed water having a pH of 7.5 or higher.
次に、電解液製造手段２によって製造された電解液９は、電解液供給手段３によって、汚染土壌１４に供給される。 Next, the electrolytic solution 9 manufactured by the electrolytic solution manufacturing unit 2 is supplied to the contaminated soil 14 by the electrolytic solution supply unit 3.
次に、電解液供給手段３によって汚染土壌１４に供給された電解液９は、汚染物質１４が油分である場合には例えば以下の反応によって油分を炭酸ガスと水に酸化分解する。従って、油分は汚染土壌中において無害化されると同時に無臭化されることになる。また、下記の反応以外にも油分は電解液９によって各種の物質に分解される。
Next, when the contaminant 14 is oil, the electrolyte 9 supplied to the contaminated soil 14 by the electrolyte supply means 3 oxidizes and decomposes the oil into carbon dioxide gas and water by the following reaction, for example. Therefore, the oil is detoxified in the contaminated soil and at the same time non-brominated. In addition to the following reaction, the oil is decomposed into various substances by the electrolytic solution 9.
また、汚染土壌中において油分やその他の汚染物質が完全に分解されなかった場合でも、油分やその他の汚染物質が次亜塩素酸（ＨＯＣｌ）やヒドロキシラジカル（ＯＨ−）によって土壌から遊離、すなわち剥がし取られて電解液中に溶解または分散することになる。そして、油分やその他の汚染物質を含む電解液１９は地中内に留まったり、一部は地下水とともに帯水層２１に流れることになる。 Even if the oil and other pollutants are not completely decomposed in the contaminated soil, the oil and other pollutants are released from the soil by hypochlorous acid (HOCl) or hydroxy radical (OH − ), that is, peeled off. It is taken and dissolved or dispersed in the electrolyte. Then, the electrolytic solution 19 containing oil and other pollutants remains in the ground, or part of it flows into the aquifer 21 together with the groundwater.
次に、地中内に留まったり、地下水とともに帯水層２１に流れた分解後の汚染物質を含む電解液１９または地下水２０は、汚染物質回収手段４の回収井戸１５からポンプ１７によって回収されてタンク１８に貯蔵される。そして、汚染物質が完全に分解できている場合には、回収液２３は再度、電解液製造手段２に送られて再利用されたり、そのまま廃棄されることになる。 Next, the electrolytic solution 19 or the ground water 20 containing the decomposed pollutant staying in the ground or flowing into the aquifer 21 together with the ground water is recovered from the recovery well 15 of the contaminant recovery means 4 by the pump 17. Stored in tank 18. When the contaminants are completely decomposed, the recovered liquid 23 is sent again to the electrolytic solution manufacturing means 2 and reused or discarded as it is.
一方、油分やその他の汚染物質が完全に分解されなかった場合については、さらに分離手段２２において油分の分離処理が行われたり、電気分解手段３０において油分やその他の汚染物質の分解処理が行われることになる。 On the other hand, when the oil and other pollutants are not completely decomposed, the separation means 22 further performs the oil separation process, or the electrolysis means 30 performs the oil content and other pollutants decomposition process. It will be.
最後に、分離手段２２や電気分解手段３０によって完全に処理された回収液２３は、再度、電解液製造手段２に送られ再利用されることになる。 Finally, the recovered liquid 23 completely processed by the separation means 22 and the electrolysis means 30 is sent again to the electrolytic solution production means 2 and reused.
上記のような動作によって汚染土壌の処理が行われることから、本発明の汚染土壌の処理システムおよび汚染土壌の処理方法は、従来の方法に比べて汚染状況が高濃度、広範囲、高深度である場合においても効果的に土壌処理を行うことができる。
また、電解水を地表から散布したり簡単な供給井戸を掘るだけでよいことから電極を地中に埋設するなど大掛かりな設備も必要とせず、また電解液を再利用することもできることから、低コストで、安全かつ確実に汚染土壌の処理を行うことができる。
また、次亜塩素酸を含む電解水を用いることによって、汚染物質が油分である場合には、汚染土壌の無害化処理および無臭化処理を行うことができる。
さらに、分離手段を設けることによって有価物としての油分を分離することもできる。
Since the contaminated soil is treated by the operation as described above, the contaminated soil treatment system and the contaminated soil treatment method of the present invention have a high concentration, a wide range, and a high depth of contamination compared to the conventional method. Even in the case, soil treatment can be effectively performed.
In addition, it is only necessary to spray electrolyzed water from the ground surface or dig a simple supply well, so there is no need for large-scale equipment such as embedding electrodes in the ground, and the electrolyte can be reused. Contaminated soil can be treated safely and reliably at low cost.
In addition, by using electrolyzed water containing hypochlorous acid, when the pollutant is oil, the contaminated soil can be detoxified and non-brominated.
Furthermore, the oil as valuables can also be separated by providing a separating means.
（電解液の作製）
導電性セラミックを＋極の電極に、チタンを−極の電極に用いて０．５〜０．８％の食塩水を電気分解することによってｐＨ８．５〜９．５の電解液を作製した。
(Preparation of electrolyte)
An electrolytic solution having a pH of 8.5 to 9.5 was prepared by electrolyzing 0.5-0.8% saline using a conductive ceramic as a positive electrode and titanium as a negative electrode.
（汚染土壌の改質と油分および油臭の分布状態の観察）
次に、油分によって汚染された土壌に回収井戸を設置した後、上記によって作製した電解液を１５〜２０ｔ／日のペースで散布し、回収井戸に溜まった汚染水を含む電解水をポンプによって回収することによって汚染土壌の改質を四カ月間行った。そして、その際汚染土壌の５箇所についてボーリングの定点調査を行い、油分と油臭の分布状態を観察した。結果を図３に示す。
(Reform of contaminated soil and observation of oil and oil odor distribution)
Next, after installing a recovery well in soil contaminated with oil, the electrolytic solution prepared as described above is sprayed at a rate of 15 to 20 t / day, and the electrolytic water containing the contaminated water collected in the recovery well is recovered by a pump. By doing so, the contaminated soil was improved for four months. At that time, a fixed point survey of the boring was conducted at five locations of the contaminated soil, and the distribution of oil and oily odor was observed. The results are shown in FIG.
その結果、いずれの調査地点においても電解水を散布した後においては油分および油臭の分布が少なくなっており、汚染土壌の改質が行われていることがわかった。 As a result, after spraying electrolyzed water at any of the survey points, the distribution of oil and oil odor decreased, indicating that the contaminated soil was being reformed.
本発明の汚染土壌の処理システムおよび汚染土壌の処理方法は、鉱物油や化学物質などの有害物質に汚染された汚染土壌の処理に用いることができる。 INDUSTRIAL APPLICABILITY The contaminated soil treatment system and the contaminated soil treatment method of the present invention can be used for treatment of contaminated soil contaminated with harmful substances such as mineral oil and chemical substances.
１ 汚染土壌の処理システム
２ 電解液製造手段
３ 電解液供給手段
４ 汚染物質回収手段
５ 電気分解槽
６ 電極
７ 電解質溶液
８ 電源
９ 電解液
１０ 配管
１１ ポンプ
１２ スプレー
１３ 供給井戸
１４ 汚染土壌
１５ 回収井戸
１６ 配管
１７ ポンプ
１８ タンク
１９ 汚染物質を含む電解液
２０ 汚染物質を含む地下水
２１ 帯水層
２２ 分離手段
２３ 回収液
２４ 粗粒化装置
２５ オイルスキマー
２６ ポンプ
２７ 分離槽
２８ 吸着フィルター
２９ 吸着槽
３０ 電気分解手段
DESCRIPTION OF SYMBOLS 1 Contaminated soil processing system 2 Electrolyte production means 3 Electrolyte supply means 4 Contaminant recovery means 5 Electrolysis tank 6 Electrode 7 Electrolyte solution 8 Power supply 9 Electrolyte 10 Pipe 11 Pump 12 Spray 13 Supply well 14 Contaminated soil 15 Recovery well 16 Pipe 17 Pump 18 Tank 19 Electrolyte containing pollutant 20 Groundwater containing pollutant 21 Aquifer 22 Separation means 23 Collected liquid 24 Coarse granulator 25 Oil skimmer 26 Pump 27 Separation tank 28 Adsorption filter 29 Adsorption tank 30 Electricity Disassembling means
Claims (8)
前記電解液製造手段によって製造した電解液を汚染土壌に供給する電解液供給手段と、
前記電解液によって前記汚染土壌から遊離または分解した汚染物質を含む前記電解液および／または地下水を回収する汚染物質回収手段とを備えることを特徴とする汚染土壌の処理システム。 Electrolyte production means;
An electrolyte supply means for supplying the electrolyte produced by the electrolyte production means to the contaminated soil;
A contaminated soil treatment system, comprising: the electrolyte solution containing the pollutant released or decomposed from the contaminated soil by the electrolyte solution and / or a pollutant collecting means for collecting groundwater.
前記汚染物質と前記電解液および／または前記地下水とを分離する分離手段を備えることを特徴とする請求項１に記載の汚染土壌の処理システム。 After the contaminant recovery means,
2. The contaminated soil treatment system according to claim 1, further comprising a separation unit configured to separate the contaminant from the electrolyte solution and / or the groundwater.
前記汚染物質が溶解または分散した前記電解液および／または前記地下水を電気分解処理する電気分解手段を備えることを特徴とする請求項１または請求項２に記載の汚染土壌の処理システム。 After the contaminant recovery means,
3. The contaminated soil treatment system according to claim 1, further comprising an electrolysis unit that electrolyzes the electrolytic solution and / or the groundwater in which the contaminant is dissolved or dispersed.
油汚染土壌であること特徴とする請求項１から請求項３のいずれか一項に記載の汚染土壌の処理システム。 The contaminated soil is
It is oil-contaminated soil, The processing system of the contaminated soil as described in any one of Claims 1-3 characterized by the above-mentioned.
次亜塩素酸を含む電解水であること特徴とする請求項１から請求項４のいずれか一項に記載の汚染土壌の処理システム。 The electrolyte is
It is electrolyzed water containing hypochlorous acid, The processing system of the contaminated soil as described in any one of Claims 1-4 characterized by the above-mentioned.
前記電解液製造工程によって製造した電解液を汚染土壌に供給する電解液供給工程と、
前記電解液によって前記汚染土壌から汚染物質を遊離または分解する汚染物質遊離分解工程と、
前記汚染土壌から遊離または分解した汚染物質を含む前記電解液中および／または地下水を回収する汚染物質回収工程とを備えることを特徴とする汚染土壌の処理方法。 Electrolyte manufacturing process,
An electrolytic solution supplying step of supplying the electrolytic solution manufactured by the electrolytic solution manufacturing step to the contaminated soil;
A pollutant free decomposing step of liberating or decomposing pollutants from the contaminated soil by the electrolytic solution;
A method for treating contaminated soil, comprising: a contaminant recovery step of recovering in the electrolyte and / or groundwater containing contaminants liberated or decomposed from the contaminated soil.
前記汚染物質と前記電解液および／または前記地下水とを分離する分離工程を備えることを特徴とする請求項６に記載の汚染土壌の処理方法。 In the subsequent process of the pollutant recovery process,
The method for treating contaminated soil according to claim 6, further comprising a separation step of separating the contaminant from the electrolytic solution and / or the groundwater.
前記汚染物質を含む前記電解液および／または前記地下水を電気分解処理する電気分解工程を備えることを特徴とする請求項６または請求項７に記載の汚染土壌の処理方法。
In the subsequent process of the pollutant recovery process,
The method for treating contaminated soil according to claim 6 or 7, further comprising an electrolysis process for electrolyzing the electrolytic solution containing the contaminant and / or the groundwater.
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