JP2018075502A - Treatment method for effectively utilizing land contaminated with harmful organic matter and metal - Google Patents
Treatment method for effectively utilizing land contaminated with harmful organic matter and metal Download PDFInfo
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本発明は、過去に有害な有機物や金属類を副生する工場が設置されていたことなどにより土壌が汚染されている場所に、あらたに施設などを設置して有効ようとする場合に、環境・安全を保全するための処理方法に関する。 The present invention is effective when a facility is newly installed in a place where the soil is contaminated due to the fact that a factory that produces harmful organic substances and metals as a by-product has been installed in the past. -It relates to processing methods for maintaining safety.
化石燃料などを原料として、ガス燃料などの製品を大量に製造していた工場があった場所などでは、その処理中に発生した、ベンゼン、シアン化合物、ヒ素、鉛、水銀、六価クロム、カドミウムなどの有害な有機物や金属類により周辺の土壌が汚染されている場合がある。その場所やその周辺の土地を別の目的、例えば食品などを扱う施設に利用しようとすれば、土壌の汚染に対して十分な対応策が取られ、安全性が確保されることが望まれる。これに関して、公知の方策の第１は、汚染された土壌を掘り起こして、最終処分場に運んで埋め立てなどで処分し、その跡地に清浄な土を運んできて埋め立てる方法である。しかし、その場合にも、どの範囲まで掘り出して最終処分場に移動するかなどについては、諸般の事情の影響を受けることもあり、後日、問題を生じる場合もある。また、掘り出した汚染土壌の移動、埋め立ての過程での有害物質の放散、最終処分場での中期的、長期的な有害物質の放散のおそれなどについて十分な対応策が講じられていない場合には副次的な問題を生ずることもある。 Benzene, cyanide, arsenic, lead, mercury, hexavalent chromium, cadmium, etc., generated during processing in places where there were factories that manufactured gas fuel and other products using fossil fuels as raw materials The surrounding soil may be contaminated with harmful organic substances such as metal and metals. If the place or the surrounding land is used for another purpose, for example, a facility that handles food, it is desirable that sufficient countermeasures are taken against soil contamination to ensure safety. In this regard, the first known method is a method of digging up contaminated soil, transporting it to a final disposal site and disposing it by landfill, etc., and transporting clean soil to the ruins to landfill. However, even in that case, the extent of excavation and transfer to the final disposal site may be affected by various circumstances and may cause problems at a later date. In addition, when sufficient measures are not taken, such as the movement of excavated contaminated soil, the release of hazardous substances in the landfill process, and the possibility of the release of hazardous substances in the medium to long term at the final disposal site It may cause secondary problems.
さらに考慮しなければならないのは、土壌中に残留した有害汚染物は地下水を介して移動し、移動先で水分の蒸発が起こると有害物の濃縮が起こることである。この現象を十分に配慮しないで、汚染度がある規定値以上の土壌を除去するというだけでは、後日、予想しなかった問題を生じるおそれがある。したがって、ある基準値以上の汚染土壌は除去して清浄な土壌をその跡に埋めることを行ったとしても、併せてその周辺部などの汚染物質を含んでいるおそれがある部分については、汚染物質が地下水脈に溶け込むことを抑制、防止する方策を併せて行うことが望まれる。 An additional consideration is that harmful pollutants that remain in the soil move through groundwater, and the concentration of harmful substances occurs when moisture evaporates at the destination. If we do not consider this phenomenon enough and only remove soil with a contamination level above a certain value, there may be an unexpected problem at a later date. Therefore, even if contaminated soil above a certain standard value is removed and clean soil is buried in the trace, the portion that may contain contaminants, such as the surrounding area, is also contaminated. It is hoped that measures will be taken to prevent and prevent the water from dissolving into the groundwater veins.
対応策の先行例としての本発明者らは、さきにアスベストなどの有害物の散らばりを防止するための方策として特許文献１、放射能汚染された土地の処理方法として特許文献２、有害な有機物や金属類によって土壌が汚染されている場所の処理方法として特許文献３を示している。いずれもシリコン樹脂乳化液を利用した処理で、有害物のちらばりを防止する方法である。 The inventors of the present invention as a precedent example of countermeasures have previously disclosed Patent Document 1 as a measure for preventing the dispersion of harmful substances such as asbestos, Patent Document 2 as a method for treating radioactively contaminated land, and harmful organic substances. Patent document 3 is shown as a processing method of the place where soil is contaminated with metal. All of these are treatments using a silicone resin emulsified liquid, and are methods for preventing the scattering of harmful substances.
特許文献３の方法とは別に、あるいはそれと合わせて行う方法として、有機酸を用いる可能性がある。これは、ゴルフ場などで芝の一部が枯れる、「ホットスポット」と呼ばれる現象を利用することである。これは、植物が炭酸同化作用を行うために利用した有機酸が土中に残り、これが１つの要因になって、有機物質が水に溶けて移動して土壌粒子表面を覆い、乾燥すると土壌に撥水性を持たせ、その部分の土壌が植物の生育に適さないものになるという現象である。この現象は、次のように説明されている。
(1)枯死した植物が分解したもの、微生物が堆積したもの、植物滲出（分泌）物により有機酸が形成される。
(2)有機酸は水をはじく部分（疎水性部分）と、水になじみやすい部分（親水性部分）の２つから構成されている。
(3)この有機酸の乾燥が進むと、親水性部分が縮小して、疎水性部分で覆われることになる。
すなわち、有機酸が土壌に付着して乾燥が進むと、有機酸の構造が上記のように変化し、さらに乾燥が進むと土壌粒子表面を疎水性部分が覆うようになり、撥水性土壌になる。そして、そこに根を持つ植物にとっては、水が得られなくなって、枯死することになる。
この現象は、現時点では否定的な影響を及ぼすものとして捉えられ、その対応策として自然に生成した有機酸を分解処理する方法などが開発されているが、この現象を有効に利用しようとするものについての先行例は見られない。
There is a possibility of using an organic acid as a method performed separately from or in combination with the method of Patent Document 3. This is to use a phenomenon called “hot spot” in which a part of the turf witheres in a golf course or the like. This is because the organic acid used by the plant for carbon assimilation remains in the soil, which is one factor that causes the organic substance to dissolve in water, move and cover the surface of the soil particles, and dry to the soil. It is a phenomenon in which water repellency is imparted and the soil in that part becomes unsuitable for plant growth. This phenomenon is explained as follows.
(1) Organic acids are formed by the decomposition of dead plants, the accumulation of microorganisms, and plant exudates (secretions).
(2) The organic acid is composed of two parts, a part that repels water (hydrophobic part) and a part that easily conforms to water (hydrophilic part).
(3) As the drying of the organic acid proceeds, the hydrophilic portion shrinks and is covered with the hydrophobic portion.
That is, when the organic acid adheres to the soil and the drying proceeds, the structure of the organic acid changes as described above, and when the drying proceeds further, the hydrophobic part covers the soil particle surface, resulting in a water-repellent soil. . And for plants with roots there is no water and they die.
This phenomenon is currently regarded as having a negative effect, and as a countermeasure, a method for decomposing organic acid that has been naturally generated has been developed. There are no precedents for.
本発明は、有害な有機物や金属類によって土壌が汚染されている場所に新たに施設を設置しようとする場合に、環境・安全を保全するための処理方法に関する。 The present invention relates to a treatment method for preserving the environment and safety when a facility is newly installed in a place where soil is contaminated with harmful organic substances and metals.
本発明の課題を解決するための方法の第１は、フルボ酸やフミン酸などの高分子有機酸を含む液を、有害な有機物や金属類によって汚染されている土壌中に圧入して土壌粒子に疎水性を持たせて有害物の地下水への滲出を抑制することにより、有害物で汚染された土地の有効利用を可能にすることである。 A first method for solving the problems of the present invention is to press a liquid containing a high-molecular organic acid such as fulvic acid or humic acid into soil contaminated with harmful organic substances or metals to form soil particles. It is possible to effectively utilize the land contaminated with harmful substances by making them hydrophobic and suppressing the seepage of harmful substances into the groundwater.
本発明の課題を解決するための方法の第２は、０００７において、フミン酸やフルボ酸などの腐食酸を含むものにアルカリあるいは弱酸性の液体を加えてフミン酸やフルボ酸を溶出させた水溶液を作り、水分の蒸発を行わせて、フミン酸、フルボ酸のいずれかに関して、飽和溶解度の１／１００〜６／１０の範囲の水溶液を作り、汚染土壌中に圧入することである。 A second method for solving the problems of the present invention is the aqueous solution obtained by adding an alkali or weakly acidic liquid to one containing a corrosive acid such as humic acid or fulvic acid to elute humic acid or fulvic acid in 0007. The water is evaporated, and an aqueous solution having a saturation solubility in the range of 1/100 to 6/10 is prepared for either humic acid or fulvic acid, and is injected into the contaminated soil.
本発明の課題を解決するための方法の第３は、０００７において、フミン酸やフルボ酸などの腐食酸を含む地下水、河川水を採取して、水分の蒸発を行わせて、フミン酸、フルボ酸のいずれかに関して、飽和溶解度の１／１００〜６／１０の範囲の水溶液を作り、汚染土壌中に圧入することである。 A third method for solving the problems of the present invention is that in 0007, groundwater and river water containing corrosive acids such as humic acid and fulvic acid are collected, and water is evaporated to obtain humic acid and fulvic acid. For any of the acids, make an aqueous solution in the range of 1/100 to 6/10 of the saturation solubility and press fit into the contaminated soil.
本発明の課題を解決するための方法の第３は、０００７，０００８，０００９において、フルボ酸やフミン酸などの高分子有機酸を含む液を汚染土壌中に圧入する時に、糸状菌を加えることである。 A third method for solving the problems of the present invention is to add a filamentous fungus in 0007, 0008, 0009 when a liquid containing a high molecular organic acid such as fulvic acid or humic acid is pressed into contaminated soil. It is.
０００７によって、汚染された土壌粒子に撥水性を持たせることで、土壌中に含まれていた有害な有機物や金属類などが地下水に溶け込んで放散することを防止できる。０００８，０００９の方法によって、自然界に存在するものを利用して、土壌中に含まれていた有害な有機物や金属類などが地下水に溶け込んで放散することを防止できる。００１０の方法によって、フルボ酸やフミン酸などの高分子有機酸による汚染土壌の被覆・撥水性を持たせる現象を効率的に進めることができる。 By providing water repellency to the contaminated soil particles according to 0007, it is possible to prevent harmful organic substances or metals contained in the soil from being dissolved in the groundwater and released. According to the methods of 0008 and 0009, it is possible to prevent the harmful organic substances and metals contained in the soil from being dissolved in the ground water and dissipating by using those existing in the natural world. By the method 0010, it is possible to efficiently advance the phenomenon of covering and water repellency of contaminated soil with high molecular organic acids such as fulvic acid and humic acid.
本発明が処理の対象とするのは、過去に工場などが設置されていたために、ベンゼン、シアン化合物、ヒ素、鉛、水銀、六価クロム、カドミウムなどの有害物で土壌が汚染されている場所である。そのような場所を別の目的に利用しようとする場合、通常は土壌サンプルを採取して汚染物の濃度を分析し、汚染物の濃度が規制値より高い場所は、汚染土壌を掘り出して、最終処分場に運んで処理し、一方、汚染土壌を取り除いた跡地には、清浄な土壌を埋め立てる方法が用いられる。しかし、局部的に規定値を超える汚染土が残留していたり、また、残留した汚染土（たとえその汚染度が規定値を超えていなくても）から地下水の流れによって汚染物質が運ばれ、別の場所で水分の蒸発などによって、想定外の悪影響を生じるおそれがある。本発明は、残された土壌層の１部（例えば除かれた部分に近接する部分）に対して事前（次の建物などを設置前）に処理を施すか、あるいは、その地に次の建物などを設置してから、地下水の分析などによって汚染の問題が見つけられた場合に、問題となる土壌部に対して施す方法である。その方法の基本的な考え方は、汚染土壌粒子の表面を水の透過を阻止する被膜で覆うことで有害物の地下水への溶け込みによる移動を阻止することである。その被膜形成のために本発明では、フミン酸やフルボ酸などの高分子有機酸を含む水溶液を圧入して、土壌中で水分の低減の進行によって汚染土壌の粒子表面に水を透さない被膜を形成させて、有害汚染物質が地下水に溶け込むことを防止することを特徴とする。 The object of the treatment of the present invention is a place where soil has been contaminated with harmful substances such as benzene, cyanide, arsenic, lead, mercury, hexavalent chromium and cadmium because factories have been installed in the past. It is. When trying to use such a place for another purpose, usually a soil sample is taken and analyzed for the concentration of the pollutant. If the pollutant concentration is higher than the regulation value, the contaminated soil is excavated and the final On the other hand, a method of reclaiming clean soil is used for the site where the contaminated soil is removed while being transported to the disposal site. However, contaminated soil that exceeds the specified value remains locally, or pollutants are carried by the flow of groundwater from the remaining contaminated soil (even if the degree of contamination does not exceed the specified value). There is a risk that unexpected adverse effects will occur due to evaporation of moisture at the location. In the present invention, a part of the remaining soil layer (for example, a part close to the removed part) is processed in advance (before the next building is installed), or the next building on the ground If the problem of pollution is found by analysis of groundwater after installing, etc., it is applied to the soil part in question. The basic idea of the method is to prevent the movement of harmful substances due to the dissolution of groundwater by covering the surface of contaminated soil particles with a coating that blocks the permeation of water. In order to form the film, in the present invention, an aqueous solution containing a high molecular organic acid such as humic acid or fulvic acid is injected, and the film does not allow water to pass through the particle surface of contaminated soil due to the progress of moisture reduction in the soil. It is characterized by preventing harmful pollutants from dissolving in groundwater.
フミン酸とは、もともと広葉樹などの各種植物が、炭酸同化作用による自らの成長のために必要な高分子有機酸として作ったもので、直鎖炭化水素と多環芳香族化合物の分子量数千から1万程度の難分解性高分子化合物である。炭素55〜58％、水素3.6〜6.0％、窒素3.0〜5.7％、残りの大部分は酸素であるが、1％以下の硫黄を含む。もとの植物が枯死後も、このフミン酸は安定した物質として存続し、森林の腐葉土を始め、腐植土や土壌、
1478484884375_0
・
1478484884375_1
・
1478484884375_2
堆積物の中の存在している。アルカリ性液や弱酸性液には溶けるが、強酸液では沈殿する。
Humic acid was originally made by various plants such as hardwood as a high-molecular organic acid necessary for its own growth by carbon dioxide assimilation. From the molecular weight of thousands of linear hydrocarbons and polycyclic aromatic compounds It is a highly degradable polymer compound of about 10,000. Carbon 55-58%, hydrogen 3.6-6.0%, nitrogen 3.0-5.7%, most of the remainder is oxygen but contains less than 1% sulfur. Even after the original plant dies, this humic acid remains as a stable substance, including forest humus, humus and soil,
1478484884375_0
・
1478484884375_1
・
1478484884375_2
Present in the sediment. It dissolves in alkaline and weakly acidic liquids, but precipitates in strong acid liquids.
一方、フルボ酸とは、海草・藻類・植物類などの有機物が、自然環境の中で微生物の作用を受けながら分解と再構築を繰り返し、生成・蓄積した腐植物質と呼ばれる有機物の１つで、酸性液，中生液、アルカリ性液にも溶ける水溶性の物質で、
1478484884375_3
を35〜42%、
1478484884375_4
を3〜6%、
1478484884375_5
を約1%、
1478484884375_6
を約0.3〜0.7%含有している。
On the other hand, fulvic acid is one of organic substances called humic substances that are generated and accumulated by organic substances such as seaweeds, algae, and plants that are repeatedly decomposed and reconstructed under the action of microorganisms in the natural environment. A water-soluble substance that is soluble in acidic, mesophilic and alkaline solutions.
1478484884375_3
A 35-42%,
1478484884375_4
A 3-6%,
1478484884375_5
About 1%,
1478484884375_6
About 0.3-0.7%.
本発明の目的である、土中に存在する有害な有機物や金属を含む土壌粒子の表面に疎水性の被覆を形成して、地下水などへの有害物質の溶け込み、移送を阻止するためには、(1)フミン酸やフルボ酸などの有機腐食酸を含む水溶液を作る（その水溶液中の濃度は、フミン酸、フルボ酸のいずれかに関して、飽和溶解度の１／１００〜６／１０の範囲の水溶液を作る。）(2)その液を、有害物質が規制値の１／１０以上残留すると見なさせる土壌中に圧入する。その結果、汚染土壌粒子の表面にフミン酸、フルボ酸のいずれの固体被膜が形成されて、以後、汚染土壌粒子中の有害物質が水に溶けて土壌粒子外に持ち出されて地下水などに溶け込むことが阻止でき、本発明の目的を達することができる。 To form a hydrophobic coating on the surface of soil particles containing harmful organic substances and metals present in the soil, which is the object of the present invention, to prevent the toxic substances from dissolving and transferring into groundwater, etc. (1) Making an aqueous solution containing an organic corrosive acid such as humic acid or fulvic acid (the concentration in the aqueous solution is an aqueous solution having a saturation solubility in the range of 1/100 to 6/10 with respect to either humic acid or fulvic acid. (2) Press the solution into the soil that makes it deemed that harmful substances remain 1/10 or more of the regulation value. As a result, a solid coating of either humic acid or fulvic acid is formed on the surface of the contaminated soil particles, and thereafter, the harmful substances in the contaminated soil particles dissolve in water and are taken out of the soil particles and dissolved in groundwater. Can be prevented and the object of the present invention can be achieved.
００１４の(1)については、フミン酸やフルボ酸は、各種の植物を始点にし、微生物活動によって生まれた二次生産物(腐植物質)で、基本的には自然界のいたるところ(土壌、腐葉土、地下水、河川、海水等)に存在している。特に、森林（特に広葉樹林）の、腐葉土などの堆肥化した地質堆積物に濃度が高い状態で存在する。本発明では、これらのうち固体のものについてはアルカリあるいは弱酸性の液体に加えてフミン酸やフルボ酸を溶出させた水溶液にしたもの、あるいは地下水、河川水などを基点として、水分の蒸発を行わせて、フミン酸、フルボ酸のいずれかに関して、飽和溶解度の１／１００〜６／１０の範囲の水溶液を作る。なお、この場合にアルカリあるいは弱酸性の液体を用い、酸性の液体を用いないのは、強酸性液の場合はフミン酸が析出するからである。 As for 0014 (1), humic acid and fulvic acid are secondary products (humic substances) born from microbial activity starting from various plants, and basically all over the natural world (soil, humus, Existing in groundwater, rivers, seawater, etc.) In particular, it is present in high concentrations in composted geological sediments such as mulch in forests (especially hardwood forests). In the present invention, solid substances are evaporated from an aqueous solution obtained by eluting humic acid or fulvic acid in addition to an alkali or weakly acidic liquid, or from groundwater or river water. In addition, an aqueous solution having a saturation solubility in the range of 1/100 to 6/10 with respect to either humic acid or fulvic acid is prepared. In this case, the reason why an alkali or weakly acidic liquid is used and no acidic liquid is used is that humic acid is precipitated in the case of a strongly acidic liquid.
なお、フミン酸やフルボ酸は工業的に製造することも可能である。例えば、ニトロフミン酸は工業生産されて、ボーリング泥水の調整剤、土壌改良剤、肥効増進剤、窯業原料やセメント製造原料の調整剤、コンクリート施工上の調整剤などとしても用いられたことがある。このように工業的に製造されたフミン酸やフルボ酸を用いた場合には水に溶かして、００１５で述べたのと同じく飽和溶解度の１／１００〜６／１０の範囲の水溶液を作る。 Humic acid and fulvic acid can also be produced industrially. For example, nitrohumic acid has been industrially produced and has been used as a boring mud conditioner, soil conditioner, fertilizer, a ceramic material and cement manufacturing material, and a concrete construction agent. . When industrially produced humic acid or fulvic acid is used in this way, it is dissolved in water to form an aqueous solution having a saturation solubility in the range of 1/100 to 6/10, as described in 0015.
００１５，００１６で得られた液を、土壌中の有害物の分析結果に対応して、有害物が地下水に溶け込まないようにするために、処理の対象とする汚染土壌中にパイプを通して圧入する。圧入されて液は土壌中で水分濃度が低下して、汚染土壌粒子の表層にフミン酸、フルボ酸によって、水の不透膜を形成する。これによって、汚染土壌中の有害な物質や金属類が地下水に溶け込むことが阻止できる。フミン酸、フルボ酸に関して、飽和溶解度の１／１００〜３／１０の範囲の水溶液を圧入することによって、この阻止作用を効率に行うことが7できる。 The liquid obtained in 0015 and 0016 is pressed through a pipe into the contaminated soil to be treated in order to prevent the harmful substances from being dissolved in the groundwater in accordance with the analysis result of the harmful substances in the soil. When the liquid is injected, the water concentration decreases in the soil, and a water-impermeable film is formed on the surface layer of the contaminated soil particles by humic acid and fulvic acid. This can prevent harmful substances and metals in the contaminated soil from dissolving in the groundwater. With respect to humic acid and fulvic acid, this blocking action can be efficiently performed by injecting an aqueous solution having a saturation solubility in the range of 1/100 to 3/10.
なお、フルボ酸やフミン酸などの高分子有機酸による被覆現象は、糸状菌の存在のよって促進されるので、本発明の効果を高めるためには、フルボ酸やフミン酸などの高分子有機酸を含む液を汚染土壌中に圧入する時に、糸状菌を加えることが有効である。糸状菌は
1478484884375_7
と呼ばれる管状の
1478484884375_8
から構成されているものの総称で、糸状菌は、空気中、水中などの様々な場に生息している。とりわけ、土壌中には十万種以上存在すると言われており、土壌微生物の中で最も多いものである。
In addition, since the covering phenomenon with high molecular organic acids such as fulvic acid and humic acid is promoted by the presence of filamentous fungi, in order to enhance the effect of the present invention, high molecular organic acids such as fulvic acid and humic acid are used. It is effective to add filamentous fungi when pressurizing the liquid containing the liquid into the contaminated soil. Filamentous fungi
1478484884375_7
Tubular called
1478484884375_8
It is a general term for what is composed of, and filamentous fungi inhabit various places such as air and water. In particular, it is said that there are more than 100,000 species in the soil, and it is the most common soil microorganism.
広葉樹が多い森林から流れ出した地下水を開放容器に入れて、２０日間放置して水分の蒸発を行わせてｐＨ９の液体とした。この液体はフミン酸について飽和溶解度の４／１０の濃度であった。この液体を、燃料ガスを製造していた工場跡地などの土壌のうち、ベンゼン、シアン化合物、ヒ素、鉛、水銀、六価クロム、カドミウムのうちの３成分以上が基準量の５倍を超えている場所の土壌中に加圧注入管を通して供給した。水平面では、約５０ｃｍ間隔に、直径４０ｍｍの外管と孔の開いた内菅を同時に打ち込み、外管だけ引き上げて内管からこの液を圧入するという方法である。この液が土壌粒子を覆い水分の逸散によって不透膜が土壌粒子の表面に撥水性の薄膜を形成し有害な有機物や金属類の移動を阻止する。この処理を行ってから５日後、この地域から流出する地下水のサンプルを採取し、その分析値を、この地域から１７５０ｍ離れた場所（昔から住宅地）で採取された地下水の分析値と比較すると、ベンゼン、シアン化合物、ヒ素、鉛、水銀、六価クロム、カドミウムの含有量には有意差が認められなかった。 Groundwater that flowed out from a forest with many hardwoods was put in an open container and left for 20 days to evaporate the water to give a pH 9 liquid. This liquid had a concentration of 4/10 of the saturated solubility for humic acid. In this liquid, 3 or more of benzene, cyanide, arsenic, lead, mercury, hexavalent chromium, and cadmium in soil such as the factory site where fuel gas was manufactured exceeded 5 times the standard amount. It was fed into the soil at a certain place through a pressure injection tube. In the horizontal plane, an outer tube having a diameter of 40 mm and an inner punch with a hole are simultaneously driven at an interval of about 50 cm, and only the outer tube is pulled up and this liquid is press-fitted from the inner tube. This liquid covers the soil particles, and the impervious membrane forms a water-repellent thin film on the surface of the soil particles due to the diffusion of moisture, thereby preventing the movement of harmful organic substances and metals. Five days after performing this treatment, a sample of groundwater flowing out of this area is collected, and the analysis value is compared with the analysis value of groundwater collected at a location 1750 m away from this area (old residential area). No significant difference was found in the contents of benzene, cyanide, arsenic, lead, mercury, hexavalent chromium and cadmium.
腐葉土を水に入れ、１０日間放置した後、液体を別の容器に移して、２０日間放置して水分の蒸発を行わせた。得られた液に、糸状菌を加えて、実施例１と同じ方法でベンゼン、シアン化合物、ヒ素、鉛、水銀、六価クロム、カドミウムのうちの３成分以上が規制値の２倍以上で５倍を超えていない場所に対して、汚染土壌に圧入した。５日後、この地域から流出する地下水のサンプルを採取し、その分析値を、この地域から１７５０ｍ離れた場所（昔から住宅地）で採取された地下水の分析値と比較すると、ベンゼン、シアン化合物、ヒ素、鉛、水銀、六価クロム、カドミウムの含有量には有意差が認められなかった。 The humus was put in water and allowed to stand for 10 days, then the liquid was transferred to another container and allowed to evaporate for 20 days. Filamentous fungi are added to the obtained liquid, and in the same manner as in Example 1, 3 or more of benzene, cyanide, arsenic, lead, mercury, hexavalent chromium, and cadmium are 5 times the regulatory value and 5 The place where it did not exceed twice was pressed into the contaminated soil. Five days later, a sample of groundwater flowing out of this area was collected, and the analysis value was compared with the analysis value of groundwater collected at a location 1750 m away from this area (old residential area). There was no significant difference in the contents of arsenic, lead, mercury, hexavalent chromium, and cadmium.
本発明は、過去に有害物を発生する工場などが設置されていたことなどにより有害な有
機物や金属類によって土壌が汚染されている場所に、環境・安全を確保しながら、新たな施設を設置するための処理方法である。
The present invention establishes a new facility while ensuring the environment and safety in a place where soil is contaminated with harmful organic substances and metals due to the fact that factories that generate harmful substances have been installed in the past. It is a processing method for
Claims (4)
A harmful organic substance or metal according to claim 1, 2 or 3, characterized in that when a liquid containing a high molecular organic acid such as fulvic acid or humic acid is pressed into contaminated soil, filamentous fungi are added. A treatment method to enable effective use of land contaminated with things.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109290362A (en) * | 2018-11-12 | 2019-02-01 | 湖南农业大学 | A kind of method of quick reduction soil full cadmium and effective cadmium content |
| CN111394103A (en) * | 2020-04-02 | 2020-07-10 | 北京泷涛环境修复有限公司 | Mercury and polychlorinated biphenyl compound polluted soil remediation agent, preparation and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109290362A (en) * | 2018-11-12 | 2019-02-01 | 湖南农业大学 | A kind of method of quick reduction soil full cadmium and effective cadmium content |
| CN111394103A (en) * | 2020-04-02 | 2020-07-10 | 北京泷涛环境修复有限公司 | Mercury and polychlorinated biphenyl compound polluted soil remediation agent, preparation and application |
| CN111394103B (en) * | 2020-04-02 | 2021-10-26 | 北京泷涛环境修复有限公司 | Mercury and polychlorinated biphenyl compound polluted soil remediation agent, preparation and application |
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