JP7102715B2 - Soil purification method - Google Patents
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- JP7102715B2 JP7102715B2 JP2017236082A JP2017236082A JP7102715B2 JP 7102715 B2 JP7102715 B2 JP 7102715B2 JP 2017236082 A JP2017236082 A JP 2017236082A JP 2017236082 A JP2017236082 A JP 2017236082A JP 7102715 B2 JP7102715 B2 JP 7102715B2
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- 239000002689 soil Substances 0.000 title claims description 53
- 238000000034 method Methods 0.000 title claims description 29
- 238000000746 purification Methods 0.000 title description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 46
- -1 nitrotoluene compound Chemical class 0.000 claims description 24
- 229910052785 arsenic Inorganic materials 0.000 claims description 18
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims description 18
- 229910001385 heavy metal Inorganic materials 0.000 claims description 13
- 150000001495 arsenic compounds Chemical class 0.000 claims description 3
- 238000000354 decomposition reaction Methods 0.000 claims 2
- SPSSULHKWOKEEL-UHFFFAOYSA-N 2,4,6-trinitrotoluene Chemical compound CC1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O SPSSULHKWOKEEL-UHFFFAOYSA-N 0.000 description 17
- DYSXLQBUUOPLBB-UHFFFAOYSA-N 2,3-dinitrotoluene Chemical compound CC1=CC=CC([N+]([O-])=O)=C1[N+]([O-])=O DYSXLQBUUOPLBB-UHFFFAOYSA-N 0.000 description 15
- 239000000015 trinitrotoluene Substances 0.000 description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 14
- VLZLOWPYUQHHCG-UHFFFAOYSA-N nitromethylbenzene Chemical class [O-][N+](=O)CC1=CC=CC=C1 VLZLOWPYUQHHCG-UHFFFAOYSA-N 0.000 description 12
- 239000003344 environmental pollutant Substances 0.000 description 8
- 231100000719 pollutant Toxicity 0.000 description 8
- 239000004576 sand Substances 0.000 description 8
- 238000010828 elution Methods 0.000 description 7
- 239000002957 persistent organic pollutant Substances 0.000 description 4
- 239000006228 supernatant Substances 0.000 description 4
- 239000008399 tap water Substances 0.000 description 4
- 235000020679 tap water Nutrition 0.000 description 4
- XTRDKALNCIHHNI-UHFFFAOYSA-N 2,6-dinitrotoluene Chemical compound CC1=C([N+]([O-])=O)C=CC=C1[N+]([O-])=O XTRDKALNCIHHNI-UHFFFAOYSA-N 0.000 description 3
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000002360 explosive Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000006864 oxidative decomposition reaction Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- RMBFBMJGBANMMK-UHFFFAOYSA-N 2,4-dinitrotoluene Chemical compound CC1=CC=C([N+]([O-])=O)C=C1[N+]([O-])=O RMBFBMJGBANMMK-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000007922 dissolution test Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229940093920 gynecological arsenic compound Drugs 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- JMUOJQGOPLEWJO-UHFFFAOYSA-N 1-methyl-2,3,4,5,6-pentanitrobenzene Chemical compound CC1=C([N+]([O-])=O)C([N+]([O-])=O)=C([N+]([O-])=O)C([N+]([O-])=O)=C1[N+]([O-])=O JMUOJQGOPLEWJO-UHFFFAOYSA-N 0.000 description 1
- FXYKFNYGPRSKGV-UHFFFAOYSA-N 1-methyl-2,3,4,5-tetranitrobenzene Chemical compound CC1=CC([N+]([O-])=O)=C([N+]([O-])=O)C([N+]([O-])=O)=C1[N+]([O-])=O FXYKFNYGPRSKGV-UHFFFAOYSA-N 0.000 description 1
- ZPTVNYMJQHSSEA-UHFFFAOYSA-N 4-nitrotoluene Chemical compound CC1=CC=C([N+]([O-])=O)C=C1 ZPTVNYMJQHSSEA-UHFFFAOYSA-N 0.000 description 1
- 206010007269 Carcinogenicity Diseases 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical group ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 230000007670 carcinogenicity Effects 0.000 description 1
- 231100000260 carcinogenicity Toxicity 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001784 detoxification Methods 0.000 description 1
- 201000004428 dysembryoplastic neuroepithelial tumor Diseases 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000752 ionisation method Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004949 mass spectrometry Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007886 mutagenicity Effects 0.000 description 1
- 231100000299 mutagenicity Toxicity 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 150000002903 organophosphorus compounds Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000003802 soil pollutant Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 150000003613 toluenes Chemical class 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Description
本発明は、新規な土壌の浄化方法であって、さらに具体的には、ニトロトルエン化合物を含有する土壌の浄化方法に関する。 The present invention is a novel method for purifying soil, and more specifically, the present invention relates to a method for purifying soil containing a nitrotoluene compound.
土壌中に存在する汚染物質の多くは、人工的に製造された有機化合物や重金属化合物であって、発がん性、変異原性、爆発性といった、生物環境に悪影響を及ぼすものである。 Most of the pollutants present in soil are artificially produced organic compounds and heavy metal compounds, which have an adverse effect on the biological environment such as carcinogenicity, mutagenicity, and explosiveness.
有機汚染物質で汚染された土壌を浄化する方法として、たとえば特許文献１には、微生物を用いて有機汚染物質を分解する方法が開示されている。 As a method for purifying soil contaminated with organic pollutants, for example, Patent Document 1 discloses a method for decomposing organic pollutants using microorganisms.
ここで、軍事基地や工事現場（基地跡、現場跡を含む）等の土壌中には、たとえばトリニトロトルエン（ＴＮＴ）やジニトロトルエン（ＤＮＴ）に代表されるニトロトルエン化合物のような、有機汚染物質が含有されている場合がある。 Here, in the soil of military bases and construction sites (including base traces and site traces), organic pollutants such as nitrotoluene compounds typified by trinitrotoluene (TNT) and dinitrotoluene (DNT) are contained. May be contained.
このような有機汚染物質は、生分解性が低いため、特許文献１の方法では分解できない。従って、長期にわたって環境に悪影響を及ぼすおそれがある。くわえて、ニトロトルエン化合物は、周知の通り爆発性を有する化合物であり、徹底的な除去が要求される。 Since such organic pollutants have low biodegradability, they cannot be decomposed by the method of Patent Document 1. Therefore, there is a risk of adversely affecting the environment for a long period of time. In addition, the nitrotoluene compound is, as is well known, an explosive compound, and its thorough removal is required.
そこで、本発明の目的は、ニトロトルエン化合物で汚染された土壌の、簡便かつ効率的な浄化方法を実現することにある。 Therefore, an object of the present invention is to realize a simple and efficient purification method for soil contaminated with a nitrotoluene compound.
本発明者は、前述の目的を達成するため、鋭意検討の結果、本発明にかかる浄化方法に想到した。 The present inventor has come up with a purification method according to the present invention as a result of diligent studies in order to achieve the above-mentioned object.
すなわち本発明は、ニトロトルエン化合物を含有する土壌の浄化方法であって、前記土壌に鉄粉を添加した後、前記ニトロトルエン化合物を吸着した鉄粉を回収してなることを特徴とする、土壌の浄化方法に関する。また本発明は、前記土壌がさらにヒ素化合物等の重金属類を有する（汚染されている）場合においても、効率的に浄化することができる。 That is, the present invention is a method for purifying soil containing a nitrotoluene compound, which comprises adding iron powder to the soil and then recovering the iron powder adsorbing the nitrotoluene compound. Regarding the method. Further, the present invention can efficiently purify even when the soil further contains (contaminated) heavy metals such as arsenic compounds.
また、回収した前記鉄粉に、吸着したニトロトルエン化合物を酸化分解処理によって除去することによって、前記除去された鉄粉を本発明の土壌の浄化方法に再利用することが可能である。 Further, by removing the nitrotoluene compound adsorbed on the recovered iron powder by an oxidative decomposition treatment, the removed iron powder can be reused in the soil purification method of the present invention.
本発明にかかる土壌の浄化方法により、爆発性を有するニトロトルエン化合物で汚染された土壌を、簡便且つ効率的に浄化することができる。 According to the soil purification method according to the present invention, soil contaminated with an explosive nitrotoluene compound can be easily and efficiently purified.
以下、本発明の形態について説明するが、本発明の範囲は、実施例を含めた当該記載に限定されるものではない。なお、本願において、「％」は、特にことわりのない限り、重量％を意味する。 Hereinafter, embodiments of the present invention will be described, but the scope of the present invention is not limited to the description including examples. In the present application, "%" means% by weight unless otherwise specified.
＜汚染物質＞
土壌の汚染物質としては、無機物質としてはヒ素、カドミウム、鉛、六価クロム、水銀、銅といった重金属、有機物質としてはニトロトルエン化合物、有機リン化合物、ポリ塩化ビフェニル（ＰＣＢ）、ジクロロメタン、クロロエチレン、１，２－ジクロロエタン等の塩素化合物、ベンゼン、および１，４－ジオキサンなどが挙げられる。
<Pollutant>
Soil pollutants include heavy metals such as arsenic, cadmium, lead, hexavalent chromium, mercury and copper as inorganic substances, and nitrotoluene compounds, organic phosphorus compounds, polybiphenyl (PCB), dichloromethane and chloroethylene as organic substances. Examples thereof include chlorine compounds such as 1,2-dichloroethane, benzene, and 1,4-dioxane.
＜土壌＞
本発明にかかる土壌浄化方法は、上記の汚染物質のうち、ニトロトルエン化合物で汚染された土壌に対して好適に用いられる。くわえて、後述するように、ニトロトルエン化合物と共に、ヒ素化合物等の重金属類で汚染された土壌についても効率的に浄化できるという利点もある。
<Soil>
The soil purification method according to the present invention is preferably used for soil contaminated with a nitrotoluene compound among the above pollutants. In addition, as will be described later, there is an advantage that soil contaminated with heavy metals such as arsenic compounds can be efficiently purified together with nitrotoluene compounds.
また、粘性土壌に染み込んだ汚染物質は除去しづらいが、本発明にかかる土壌浄化方法は、このような粘性土壌に対しても使用することが可能である。「粘性土壌」の具体的な定義の一例としては、透水係数が１０-6ｍ／ｓeｃ以下の土壌が挙げられる。 Further, although it is difficult to remove pollutants that have soaked into viscous soil, the soil purification method according to the present invention can also be used for such viscous soil. An example of a specific definition of "viscous soil" is soil having a hydraulic conductivity of 10 -6 m / sec or less.
＜ニトロトルエン化合物＞
ニトロトルエン化合物は、各種異性体を含むトリニトロトルエン（ＴＮＴ）、ジニトロトルエン（ＤＮＴ）などが代表的なものとして存在するが、他にも各種モノニトロトルエン、テトラニトロトルエン、ペンタニトロトルエンなどで爆発性を有するニトロトルエン化合物であれば、特に限定されるものではない。
<Nitrotoluene compound>
Typical nitrotoluene compounds include trinitrotoluene (TNT) and dinitrotoluene (DNT) containing various isomers, but other nitrotoluenes such as mononitrotoluene, tetranitrotoluene, and pentanitrotoluene have explosive properties. As long as it is a compound, it is not particularly limited.
＜鉄粉＞
本発明においては、土壌中のニトロトルエン化合物を除去するために鉄粉が用いられる。鉄粉を、ニトロトルエン化合物で汚染された土壌に添加した場合、鉄粉表面に存在する孔にニトロトルエン化合物が吸着する。
<Iron powder>
In the present invention, iron powder is used to remove nitrotoluene compounds in soil. When iron powder is added to soil contaminated with a nitrotoluene compound, the nitrotoluene compound is adsorbed on the pores existing on the surface of the iron powder.
用いられる鉄粉については、通常市販されている鉄粉で差支えないが、好ましい物性としては、ヒ素などの重金属も併せて吸着させる必要がある場合は、２価鉄イオンを長期間供給できるものが好ましい。 The iron powder used may be iron powder that is usually commercially available, but the preferred physical properties are those that can supply divalent iron ions for a long period of time when it is necessary to also adsorb heavy metals such as arsenic. preferable.
鉄粉の添加量については、土壌の種類、粘度、ニトロトルエン化合物およびヒ素などの汚染物質の量その他の条件によって当業者が適宜調整することができるが、実施の一例としては、土壌１００重量部に対して６重量部程度添加される。 The amount of iron powder added can be appropriately adjusted by those skilled in the art depending on the type of soil, viscosity, amount of pollutants such as nitrotoluene compounds and arsenic, and other conditions. On the other hand, about 6 parts by weight is added.
なお、ニトロトルエン化合物は水に溶けにくいので、固体のまま鉄粉の表面に吸着しやすい。また、鉄粉は、ヒ素等の重金属類についても吸着する。更に、前記重金属類とニトロトルエン化合物とは互いに鉄粉への吸着に際して競合することがない。従って、本発明に係る土壌の浄化方法を用いることにより、ニトロトルエン化合物のみならず、ニトロトルエン化合物と前記重金属類との両方によって汚染された土壌についても効率的に浄化することができるという利点もある。 Since the nitrotoluene compound is difficult to dissolve in water, it is easily adsorbed on the surface of iron powder as a solid. Iron powder also adsorbs heavy metals such as arsenic. Further, the heavy metals and the nitrotoluene compound do not compete with each other in adsorbing to iron powder. Therefore, by using the soil purification method according to the present invention, there is an advantage that not only the nitrotoluene compound but also the soil contaminated by both the nitrotoluene compound and the heavy metals can be efficiently purified.
前記重金属類としては、ヒ素、鉛、６価クロムが挙げられる。 Examples of the heavy metals include arsenic, lead and hexavalent chromium.
＜汚染物質の除去＞
ニトロトルエン化合物やヒ素等の重金属類の汚染物質を吸着した鉄粉を、土壌から分離回収することにより、汚染土壌中の、容易に分解することができないニトロトルエン化合物を除去することができる。
<Removal of pollutants>
By separating and recovering iron powder adsorbing pollutants of heavy metals such as nitrotoluene compounds and arsenic from soil, it is possible to remove nitrotoluene compounds in contaminated soil that cannot be easily decomposed.
前記鉄粉の回収方法としては、磁石によって誘引付着させることによって回収する方法や、鉄粉と土壌粒子との比重差を利用して遠心分離により回収する方法等が挙げられる。 Examples of the method for recovering the iron powder include a method of attracting and adhering the iron powder with a magnet, a method of recovering the iron powder by centrifugation using the difference in specific gravity between the iron powder and the soil particles, and the like.
回収後の前記鉄粉は、過酸化水素水等を用いて分解を行うことによって、前記鉄粉に吸着したニトロトルエン化合物やヒ素等の重金属類を無害化し、除去することができる。そのようにして再生された鉄粉を、再び同じ方法で汚染土壌中に投入し、本発明の浄化方法に用いることが可能である。 The recovered iron powder can be decomposed with hydrogen peroxide solution or the like to detoxify and remove heavy metals such as nitrotoluene compounds and arsenic adsorbed on the iron powder. The iron powder thus regenerated can be put into the contaminated soil again by the same method and used in the purification method of the present invention.
本発明にかかる土壌の浄化方法に関し、鉄粉以外にも、浄化性能を損なわない範囲で、鉄粉の吸着効率を向上させたり、前記鉄粉を分離回収しやすくしたりするための、各種溶媒、界面活性剤などを添加することができる。 Regarding the soil purification method according to the present invention, in addition to iron powder, various solvents for improving the adsorption efficiency of iron powder and facilitating separation and recovery of the iron powder within a range that does not impair the purification performance. , Surfactant and the like can be added.
次に、実施例により本発明を説明するが、本発明の範囲はこれらの実施例に限定されるものではない。 Next, the present invention will be described with reference to Examples, but the scope of the present invention is not limited to these Examples.
＜ニトロトルエン化合物で汚染された模擬汚染土の作成＞
山砂（長野県産）、珪砂８号（日光珪砂）を用いて、表１に示すような各試験区を作成した。ＴＮＴ（２，４，６－トリニトロトルエン）、およびＤＮＴ（２，４－ジニトロトルエンと２，６－ジニトロトルエンとの重量比１：１混合物）を、砂１ｋｇ（乾燥重量）に対して５０ｍｇになるように添加した。
<Creation of simulated contaminated soil contaminated with nitrotoluene compound>
Each test plot as shown in Table 1 was prepared using mountain sand (produced in Nagano Prefecture) and silica sand No. 8 (Nikko silica sand). TNT (2,4,6-trinitrotoluene) and DNT (1: 1 mixture of 2,4-dinitrotoluene and 2,6-dinitrotoluene in weight ratio) to 50 mg per 1 kg (dry weight) of sand. It was added so as to become.
＜ニトロトルエン化合物とヒ素との両方で汚染された模擬汚染土の作成＞
前記山砂および珪砂８号を用いて、表４に示すような各試験区を作成した。ＴＮＴ（２，４，６－トリニトロトルエン）を、砂１ｋｇ（乾燥重量）に対して５０ｍｇに、ヒ素を、砂１ｋｇ（乾燥重量）に対して４ｍｇになるように添加した。
<Creation of simulated contaminated soil contaminated with both nitrotoluene compounds and arsenic>
Each test group as shown in Table 4 was prepared using the mountain sand and silica sand No. 8. TNT (2,4,6-trinitrotoluene) was added to 50 mg / kg sand (dry weight) and arsenic was added to 4 mg / kg sand (dry weight).
ガラス容器に、模擬汚染土５０ｇを添加し、溶媒としてのアセトニトリル、水道水、および鉄粉を、表１および２で示す割合で添加した。 To the glass container, 50 g of simulated contaminated soil was added, and acetonitrile, tap water, and iron powder as solvents were added at the ratios shown in Tables 1 and 2.
＜鉄粉を添加しない模擬汚染土の場合＞
ＴＮＴ、ＤＮＴ、およびヒ素に汚染された模擬汚染土について、水道水１００ｍＬを加え、４時間振とうした後、上澄み液について前記ＴＮＴ、ＤＮＴ、およびヒ素の溶出量を測定した（表３－５中の「鉄粉無添加の場合のＴＮＴ（ＤＮＴ）（ヒ素）溶出量」）。
<In the case of simulated contaminated soil without adding iron powder>
For simulated contaminated soil contaminated with TNT, DNT, and arsenic, 100 mL of tap water was added and shaken for 4 hours, and then the elution amount of TNT, DNT, and arsenic was measured for the supernatant (in Table 3-5). "TNT (DNT) (arsenic) elution amount when no iron powder is added").
＜鉄粉を添加した模擬汚染土の場合＞
ＴＮＴ、ＤＮＴ、およびヒ素に汚染された模擬汚染土について、水道水１００ｍＬを加え、１時間振とうした後、上澄み液について前記ＴＮＴ、ＤＮＴ、およびヒ素の溶出量を測定した（表３－５中の「鉄粉添加後のＴＮＴ（ＤＮＴ）（ヒ素）溶出量」）。
<In the case of simulated contaminated soil with iron powder added>
For simulated contaminated soil contaminated with TNT, DNT, and arsenic, 100 mL of tap water was added and shaken for 1 hour, and then the elution amount of TNT, DNT, and arsenic was measured for the supernatant (in Table 3-5). "TNT (DNT) (arsenic) elution amount after addition of iron powder").
次に、磁石により鉄粉を回収した後、模擬汚染土の遠心分離を行った後、上澄み液を廃棄し、風乾して浄化土を得た。この浄化土について、水道水１００ｍＬを加え、４時間振とうした後、上澄み液について前記ＴＮＴやＤＮＴの溶出量を測定した（表３－５中の「鉄粉回収後のＴＮＴ（ＤＮＴ）（ヒ素）溶出量」）。 Next, after collecting the iron powder with a magnet, the simulated contaminated soil was centrifuged, the supernatant liquid was discarded, and the soil was air-dried to obtain purified soil. To this purified soil, 100 mL of tap water was added and shaken for 4 hours, and then the elution amount of the TNT and DNT was measured for the supernatant liquid (“TNT (DNT) (arsenic) after iron powder recovery” in Table 3-5. ) Elution amount ").
ここで、２，４－ジニトロトルエンと２，６－ジニトロトルエンとの分離定量方法としては、キャピラリーカラムを用いたガスクロマトグラフ質量分析法を用いた。前記ガスクロマトグラフ質量分析計、およびその分析条件は以下の通りである。 Here, as a method for separating and quantifying 2,4-dinitrotoluene and 2,6-dinitrotoluene, a gas chromatograph mass spectrometry method using a capillary column was used. The gas chromatograph mass spectrometer and its analysis conditions are as follows.
使用機器 ： ＧＣＭＳ２０１０ Ｕｌｔｒａ（島津製作所社製）
カラム ： ＺＢ－５ｍｓ ３０ｍ×０．２５ｍｍ Ｉ．Ｄ．（０．２５μｍ） Ｚｅｂｒｏｎ社製
昇温条件 ： ５０℃（１分）－１０℃／分－２００℃（０分）－２０℃／分－２５０℃（３分）
注入方法 ： スプリットレス注入法（１分）
注入口温度 ： ２７０℃
キャリアーガス流量 ： 線速度一定モード ５５ｃｍ／分
イオン化法 ： ＥＩ
Equipment used: GCMS2010 Ultra (manufactured by Shimadzu Corporation)
Column: ZB-5ms 30m x 0.25mm I. D. (0.25 μm) Zebron heating conditions: 50 ° C (1 minute) -10 ° C / min-200 ° C (0 min) -20 ° C / min-250 ° C (3 min)
Injection method: Splitless injection method (1 minute)
Injection port temperature: 270 ° C
Carrier gas flow rate: Constant linear velocity mode 55 cm / min Ionization method: EI
溶出量の結果を表３－５に示す。なお、トルエン化合物のみで汚染された系については、再現性を担保するため、同様の実験を二度行っている（表中の「１ｓｔ」、「２ｎｄ」）。 The results of the elution amount are shown in Table 3-5. For systems contaminated only with toluene compounds, the same experiments were conducted twice to ensure reproducibility (“1st” and “2nd” in the table).
前記実施例の結果から、ＴＮＴおよび各種ＤＮＴ等のニトロトルエン化合物に汚染された土壌が、鉄粉によってほぼ完全に吸着され、浄化されていることがわかる。さらに、ニトロトルエン化合物のみならず、ニトロトルエン化合物と重金属であるヒ素との両方によって汚染された土壌についても、同様の優れた吸着、浄化効果を示していることがわかる。 From the results of the above examples, it can be seen that the soil contaminated with nitrotoluene compounds such as TNT and various DNTs is almost completely adsorbed by iron powder and purified. Furthermore, it can be seen that not only the nitrotoluene compound but also the soil contaminated with both the nitrotoluene compound and arsenic, which is a heavy metal, shows the same excellent adsorption and purification effects.
＜ニトロトルエン化合物等吸着鉄粉の無害化＞
ＤＮＴ（２，６－ジニトロトルエン）水溶液（１０００ｍｇ／Ｌ）５０ｍＬに鉄粉（５ｇ）を浸漬した後に、前記鉄粉を回収し、一つのグループ（対照区）はそのまま５０ｍＬの脱イオン水を添加して溶出試験を実施した。もう一つのグループ（酸化分解試験区）はさらに濃度１０％の過酸化水素水５０ｍＬを添加し、鉄粉に吸着した前記ＤＮＴを酸化分解した後に、この鉄粉を回収し、５０ｍＬの脱イオン水を添加して溶出試験を実施した。この結果を表６に示す。
<Detoxification of adsorbed iron powder such as nitrotoluene compounds>
After immersing iron powder (5 g) in 50 mL of an aqueous solution of DNT (2,6-dinitrotoluene) (1000 mg / L), the iron powder was recovered, and 50 mL of deionized water was added as it was to one group (control group). The dissolution test was carried out. In the other group (oxidative decomposition test group), 50 mL of hydrogen peroxide solution having a concentration of 10% was further added to oxidatively decompose the DNT adsorbed on the iron powder, and then the iron powder was recovered and 50 mL of deionized water was collected. Was added and the dissolution test was carried out. The results are shown in Table 6.
前記実施例の結果から、一度ニトロトルエン化合物等の汚染物質を吸着させた鉄粉についても、酸化分解することによって無害化され、再び汚染土壌の浄化に用いることができることがわかる。 From the results of the above examples, it can be seen that iron powder once adsorbed with a pollutant such as a nitrotoluene compound can be detoxified by oxidative decomposition and can be used again for purification of contaminated soil.
Claims (3)
回収した前記鉄粉に吸着したニトロトルエン化合物を分解処理によって除去し、前記除去された鉄粉を再利用することを特徴とする、土壌の浄化方法。 A method for purifying soil containing a nitrotoluene compound, in which iron powder is added to the soil and then the iron powder adsorbing the nitrotoluene compound is attracted and adhered by a magnet to recover the soil.
A method for purifying soil, which comprises removing the nitrotoluene compound adsorbed on the recovered iron powder by a decomposition treatment and reusing the removed iron powder .
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| JP2011056482A (en) | 2009-09-14 | 2011-03-24 | Kajima Corp | Method for treating heavy metal-contaminated soil, and system for treating heavy metal-contaminated soil |
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