JP2010240594A - Decomposition treatment method of contaminated soil and contaminated ground water - Google Patents
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Abstract
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本発明は、有機塩素化合物やベンゼン、油分等の汚染物質により土壌および地下水が汚染された地盤を対象として汚染物質を現地にて分解処理するための処理方法に関する。 The present invention relates to a treatment method for decomposing a pollutant on the ground for a ground in which soil and groundwater are contaminated with a pollutant such as an organic chlorine compound, benzene, and oil.
この種の処理方法としては以下のような方法が実用化されている。
・鉄粉法
ゼロ価の鉄粉をスラリーとして地盤に注入したり、攪拌機で土壌を攪拌しながら鉄粉を地盤に注入することにより、土壌や地下水中の有機塩素化合物を還元分解する方法。
・バイオレメディエーション法
汚染土壌・汚染地下水に微生物の栄養剤などを注入し、土着の微生物を活性化して微生物反応により汚染物質を分解する方法。
・化学的酸化法
過酸化水素水などの酸化剤と鉄などの触媒を汚染地下水に注入したり、攪拌機により攪拌しながら薬剤を注入することにより、有機塩素化合物やベンゼン等の汚染物質を化学酸化により分解する方法。
The following methods have been put to practical use as this type of treatment method.
・ Iron powder method A method of reducing and decomposing organochlorine compounds in soil and groundwater by injecting zero-valent iron powder into the ground as a slurry or injecting iron powder into the ground while stirring the soil with a stirrer.
・ Bioremediation method A method of injecting microbial nutrients into contaminated soil or contaminated groundwater, activating indigenous microorganisms, and decomposing pollutants by microbial reaction.
・ Chemical oxidation method Oxidizing agent such as hydrogen peroxide and catalyst such as iron are injected into contaminated groundwater or chemicals are injected while stirring with a stirrer to chemically oxidize pollutants such as organochlorine compounds and benzene. Disassembling method.
また、特許文献1には油汚染土壌の浄化を対象として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という浄化方法が提案されている。 Further, Patent Document 1 proposes a purification method in which contaminated soil is cleaned in situ and then bioprocessed in situ after purifying oil-contaminated soil.
上記従来の処理方法はそれぞれに有用であって多くの実績ができつつあるが、汚染土壌や汚染地下水を効率的かつ経済的に処理するためには未だ解決するべき課題も多い。
たとえば、土壌・地下水汚染においては土質や地下水中の汚染物質濃度が不均一である場合が多く、局所的に非常に高濃度の汚染エリア(プリューム)が存在することがある。また、汚染物質が単一である場合は少なく複数の汚染物質による複合汚染である場合が多いし、処理効果に影響を及ぼす地下水質(溶存酸素、酸化還元電位、各種の溶存イオン等)も様々であり、同じサイト内でも汚染濃度が経時的に変化することもある。
そのため、上記従来の処理方法によることでは、特に上記のようなケースの場合においては充分な処理効果が得られなかったり、所定工期では処理を達成できなかったり、浄化費用が当初計画より大幅に増加してしまう、といった問題が発生することが想定される。
Each of the above conventional treatment methods is useful for each, and many achievements are being made. However, there are still many problems to be solved in order to treat contaminated soil and contaminated groundwater efficiently and economically.
For example, in soil / groundwater contamination, the concentration of contaminants in soil and groundwater is often uneven, and a very high concentration of contaminated areas (plums) may exist locally. In addition, there are few cases where there is a single pollutant, and there are many cases where it is complex pollution due to multiple pollutants, and there are various groundwater qualities (dissolved oxygen, redox potential, various dissolved ions, etc.) that affect treatment effects Even in the same site, the contamination concentration may change over time.
Therefore, according to the above conventional treatment method, a sufficient treatment effect cannot be obtained especially in the case as described above, the treatment cannot be achieved in a predetermined construction period, and the purification cost is significantly increased from the initial plan. It is assumed that problems such as
また、特許文献1に示される浄化方法は洗浄処理とバイオ処理とを組み合わせることでそれらを単独で実施する場合に比べれば有効であると考えられるが、それを実施するためには注入用パイプ、揚水用パイプ、曝気用パイプ、ガス吸引用パイプを1セットとしてそれを複数セットを設置したうえで、各パイプに注入手段、揚水手段、曝気手段、ガス吸引手段を接続する必要があり、また洗浄水や栄養塩を注入しつつ地下水を揚水する必要があるばかりでなく、充分な洗浄効果を得るためには地下水を曝気したり土壌に微振動を加える必要もあるので、それらの設備全体の設置とその運転のために多大のコストと手間を要することが不可避であり、広く一般に普及するに至っていない。 Moreover, although the purification method shown in Patent Document 1 is considered to be more effective than a case where the cleaning treatment and the biotreatment are combined to implement them alone, in order to implement it, an injection pipe, It is necessary to connect pumping, pumping, aeration, and gas suction means to each pipe after setting up one set of pumping pipes, aeration pipes, and gas suction pipes. Not only is it necessary to pump groundwater while injecting water and nutrient salts, but it is also necessary to aerate the groundwater and apply slight vibrations to the soil in order to obtain a sufficient cleaning effect. It is inevitable that a great deal of cost and labor is required for the operation, and it has not been widely spread.
以上のように現時点では汚染土壌や汚染地下水を処理するための有効適切な手段は提供されていないのが実状であり、汚染土壌や汚染地下水を確実かつ効果的にしかも経済的に処理し得る有効適切な手段の開発が望まれている。 As described above, at present, no effective and appropriate means for treating contaminated soil and contaminated groundwater is provided, and it is effective to reliably and effectively treat contaminated soil and contaminated groundwater. The development of appropriate means is desired.
上記事情に鑑み、本発明は、有機塩素化合物やベンゼン、油分等の汚染物質により土壌および地下水が汚染された地盤を対象として汚染物質を現地にて分解処理するための処理方法であって、汚染エリアおよびその周囲の地盤に薬剤を注入可能な注入井戸を設けて、まず該注入井戸から化学的酸化剤を注入することにより汚染物質を酸化分解する化学的処理工程を実施し、前記化学的処理工程により汚染濃度を低減せしめた後、前記注入井戸から微生物活性剤をさらに注入することにより汚染物質を微生物によりさらに分解するバイオ処理工程を実施することを特徴とする。
本発明においては、汚染状況に応じて前記化学的処理工程と前記バイオ処理工程とを繰り返し実施することも考えられる。
In view of the above circumstances, the present invention is a treatment method for decomposing a pollutant in the field on the ground in which soil and groundwater are contaminated by a pollutant such as an organic chlorine compound, benzene, and oil. An injection well capable of injecting a drug is provided in the area and the surrounding ground, and a chemical treatment step is first performed to oxidatively decompose contaminants by injecting a chemical oxidant from the injection well, and the chemical treatment After the contamination concentration is reduced by the process, a biotreatment process is further performed in which the microbial activator is further injected from the injection well to further decompose the contaminants with the microorganisms.
In the present invention, it is also conceivable to repeat the chemical treatment step and the biotreatment step according to the contamination status.
本発明は、高価な薬剤を必要とするものの処理速度に優れる化学的処理工程と、処理速度には劣るものの安価な薬剤を使用し得るバイオ処理工程とを組み合わせることによって、それら化学的処理工程とバイオ処理工程の双方の利点を併せ持つものであり、全体として処理効率を確保しつつ薬剤コストを軽減し得て経済的な処理が可能である。 The present invention combines a chemical treatment step that requires an expensive drug but an excellent treatment speed with a biotreatment step that can use an inexpensive drug that is inferior in the treatment speed, It has the advantages of both bioprocessing steps, and it can reduce the cost of the drug while ensuring the processing efficiency as a whole, and can be economically processed.
本発明は、化学的酸化法による化学的処理工程と微生物によるバイオ処理工程とを組み合わせて汚染物質(有機塩素化合物やベンゼン、油分等)を現地で分解処理するものであるが、そのための設備としては双方の処理工程に共通に使用する注水井戸を設置するに留め、その注入井戸から各工程に必要な薬剤を順次注入するだけの操作で優れた処理効果が得られるものである。 The present invention combines a chemical treatment process by a chemical oxidation method and a bio-treatment process by microorganisms to decompose pollutants (organochlorine compounds, benzene, oil, etc.) locally, but as equipment for that purpose In this case, it is possible to obtain an excellent treatment effect by simply injecting the chemicals necessary for each step from the injection well only by installing a water injection well used in common for both treatment steps.
図1は本発明の処理方法により汚染エリアを処理している状況を示す。
本発明の処理方法では、図1に示すように汚染エリアおよびその周囲に複数(図では5本)の注入井戸1を設け、地表部に設置した2つの薬剤貯槽2,3から注入ポンプ4により注入管路5を介して各注入井戸1に対して薬剤を注入可能とする。
薬剤貯槽2は化学的処理工程の際に注入する薬剤である化学的酸化剤(たとえば過酸化水素、過硫酸ナトリウムなど)を貯留するためのものであり、薬剤貯槽3はバイオ処理工程の際に注入する薬剤である微生物活性剤(栄養剤など)を貯留するためのものであり、それら薬剤貯槽2,3のいずれか一方から選択的に薬剤を注入井戸1に注入可能としておく。
FIG. 1 shows a situation where a contaminated area is processed by the processing method of the present invention.
In the treatment method of the present invention, as shown in FIG. 1, a plurality (five in the figure) of injection wells 1 are provided around and around the contaminated area, and the
The
本発明の処理方法では、まず薬剤貯槽2から化学的酸化剤を注入することによる化学的処工程を実施し、それにより汚染物質を速やかに分解してその濃度を急速に低下させ、しかる後に薬剤貯槽3から薬剤を注入することによるバイオ処理工程に移行し、それにより汚染物質をさらに分解してその濃度をさらに低下させることを基本とする。
In the treatment method of the present invention, a chemical treatment step is first performed by injecting a chemical oxidant from the
本発明においてまず前段で実施する化学的処理工程は、後段で実施するバイオ処理工程に比べれば汚染物質を速やかに分解できるものではあるが、それに使用する薬剤は安価ではなく、したがって処理期間が長期にわたる場合には高価な薬剤を長期間にわたって多量に注入しなければならず、そのために多大な薬剤費用を必要とするので経済的な処理は望めるものではない。
一方、後段で実施するバイオ処理工程は、化学的処理工程に比べれば汚染物質を分解する速度に劣り、特に汚染物質が高濃度の場合には充分に低濃度になるまで分解するためには長期間を要してしまうが、それに必要な薬剤は安価であるから長期間にわたって継続して実施してもコスト的にはさして大きな負担にならない。
In the present invention, the chemical treatment step carried out in the first stage can decompose the pollutants more quickly than the biotreatment step carried out in the latter stage, but the chemicals used for it are not cheap and therefore the treatment period is long. In such a case, an expensive drug must be injected in a large amount over a long period of time, which requires a large amount of drug cost, and thus an economical treatment is not desired.
On the other hand, the biotreatment process carried out later is inferior to the chemical treatment process in degrading the pollutants, and is particularly long for degrading to a sufficiently low concentration when the pollutants are at a high concentration. Although it takes a long period of time, the drugs required for it are inexpensive, so even if it is carried out continuously over a long period of time, it does not impose a significant burden on the cost.
そこで本発明では、まず化学的処理工程によって高濃度の汚染物質を急速に分解し、ある程度の低濃度となった時点でバイオ処理工程に切り換えることにより、全体として処理効率を確保しつつ薬剤コストを軽減することが可能となる。
すなわち、本発明は高価な薬剤を必要とするものの処理速度に優れる化学的処理工程と、処理速度には劣るものの安価な薬剤を使用し得るバイオ処理工程とを合理的に組み合わせることによって、それら化学的処理工程とバイオ処理工程の双方の利点を併せ持つものである。
Therefore, in the present invention, first, the chemical treatment process rapidly decomposes the high-concentration pollutant, and when it reaches a certain low concentration, it switches to the bio-treatment process, thereby reducing the drug cost while ensuring the overall processing efficiency. It becomes possible to reduce.
That is, the present invention rationally combines a chemical processing step that requires an expensive drug but has an excellent processing speed with a bioprocessing step that can use an inexpensive drug that is inferior in processing speed. It combines the advantages of both a chemical treatment process and a biotreatment process.
本発明の効果を検討するための試算によれば、上記のように化学的処理工程とバイオ処理工程とを組み合わせて処理する場合と、通常の化学的処理工程を単独で処理する場合とを比較すると、同等の処理効果を得るために必要な期間は後者に比べて前者が10〜15%程度長くなるものの、それに要する処理費用は25〜30%も低減し、費用対効果の観点では充分に有効であることが確認されている。
勿論、本発明を実施するためには、汚染エリアを含めてその周囲に注入井戸1を設けてそれに2種の薬剤を選択的に注入可能とするだけで良いから、特許文献1に示されるような複雑かつ大がかりな設備を必要としないし、薬剤の切り換え操作以外には何ら面倒な操作や複雑な制御も必要とせず、その点においても本発明は充分に簡易で経済的な処理が可能であって極めて有効である。
According to the trial calculation for examining the effect of the present invention, the case where the chemical treatment step and the biotreatment step are combined as described above is compared with the case where the normal chemical treatment step is processed alone. Then, the period required to obtain the same processing effect is about 10 to 15% longer for the former than the latter, but the processing cost required for that is reduced by 25 to 30%, which is sufficient from the viewpoint of cost effectiveness. It has been confirmed that it is effective.
Of course, in order to carry out the present invention, it is only necessary to provide an injection well 1 around the contamination area including the contaminated area so that two kinds of drugs can be selectively injected therein. No complicated and large-scale equipment is required, and there is no need for any troublesome operation or complicated control other than the medicine switching operation. In this respect, the present invention is sufficiently simple and economical. It is extremely effective.
なお、通常は上記のように化学的処理工程からバイオ処理工程に移行することで充分な処理効果が得られるが、汚染物質の種類や汚染状況,土質性状等の条件によっては上記工程を基本としつつ適宜の変更も可能であり、たとえば上記のように化学的処理工程からバイオ処理工程に移行した後、再び化学的処理工程に戻ってさらにバイオ処理工程に移行するというように、化学的処理工程とバイオ処理工程とのサイクルを必要回数繰り返すことも考えられ、それによりさらに効果的な処理が可能となる。 In general, a sufficient treatment effect can be obtained by shifting from the chemical treatment step to the biotreatment step as described above. However, depending on the conditions such as the type of contaminant, contamination status, soil properties, etc. However, an appropriate change is also possible, for example, after shifting from the chemical treatment step to the biotreatment step as described above, returning to the chemical treatment step again and further shifting to the biotreatment step. It is also conceivable to repeat the cycle of the biotreatment process as many times as necessary, thereby enabling more effective treatment.
1 注入井戸
2,3 薬剤貯槽
4 注入ポンプ
5 注入管路
1 Injection well 2, 3
Claims (2)
汚染エリアおよびその周囲の地盤に薬剤を注入可能な注入井戸を設け、まず該注入井戸から化学的酸化剤を注入することにより汚染物質を酸化分解する化学的処理工程を実施し、
前記化学的処理工程により汚染濃度を低減せしめた後、前記注入井戸から微生物活性剤をさらに注入することにより汚染物質を微生物によりさらに分解するバイオ処理工程を実施することを特徴とする汚染土壌および汚染地下水の分解処理方法。 A treatment method for decomposing pollutants on the ground on the ground where soil and groundwater are contaminated by pollutants such as organochlorine compounds, benzene and oil,
An injection well capable of injecting a drug is provided in the contaminated area and the surrounding ground, and a chemical treatment process is first performed to oxidatively decompose the contaminant by injecting a chemical oxidant from the injection well.
Contaminated soil and contamination characterized in that after the contamination concentration is reduced by the chemical treatment step, a biotreatment step of further decomposing the contaminant with microorganisms is performed by further injecting a microbial activator from the injection well. Groundwater decomposition method.
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Cited By (3)
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JP2011167646A (en) * | 2010-02-19 | 2011-09-01 | Takenaka Komuten Co Ltd | Method for decomposing organic halogen compound |
JP2012125713A (en) * | 2010-12-16 | 2012-07-05 | Kajima Corp | System and method for cleaning ground water |
CN108526205A (en) * | 2018-05-22 | 2018-09-14 | 北京高能时代环境技术股份有限公司 | For polluting plot risk management and control band structure and method are reacted with the cylindricality of reparation |
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JPH0775772A (en) * | 1993-06-18 | 1995-03-20 | Kankyo Eng Kk | Method for restoring soil |
JPH11207375A (en) * | 1998-01-22 | 1999-08-03 | Sumitomo Metal Mining Co Ltd | Restoring method for underground water contamination and device therefor |
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Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0775772A (en) * | 1993-06-18 | 1995-03-20 | Kankyo Eng Kk | Method for restoring soil |
JPH11207375A (en) * | 1998-01-22 | 1999-08-03 | Sumitomo Metal Mining Co Ltd | Restoring method for underground water contamination and device therefor |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2011167646A (en) * | 2010-02-19 | 2011-09-01 | Takenaka Komuten Co Ltd | Method for decomposing organic halogen compound |
JP2012125713A (en) * | 2010-12-16 | 2012-07-05 | Kajima Corp | System and method for cleaning ground water |
CN108526205A (en) * | 2018-05-22 | 2018-09-14 | 北京高能时代环境技术股份有限公司 | For polluting plot risk management and control band structure and method are reacted with the cylindricality of reparation |
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