JPH09299924A - Soil remediation method and device therefor - Google Patents
Soil remediation method and device thereforInfo
- Publication number
- JPH09299924A JPH09299924A JP8176264A JP17626496A JPH09299924A JP H09299924 A JPH09299924 A JP H09299924A JP 8176264 A JP8176264 A JP 8176264A JP 17626496 A JP17626496 A JP 17626496A JP H09299924 A JPH09299924 A JP H09299924A
- Authority
- JP
- Japan
- Prior art keywords
- water
- soil
- separation tank
- soluble organic
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば油等の難水
溶性有機物で汚染された土壌から汚染物質を分離して処
理することにより、汚染土壌を浄化する土壌浄化工法
と、該工法で使用される装置に関する。TECHNICAL FIELD The present invention relates to a soil purification method for purifying contaminated soil by separating pollutants from soil polluted with a poorly water-soluble organic substance such as oil and treating the soil, and a method for use in the method. Related equipment.
【０００２】[0002]
【従来の技術】工場における廃棄物処理、石油タンクか
らの油漏出、産業廃棄物の不法投棄等により、油等の難
水溶性有機物で汚染された土壌は、地中の生態系に大き
な影響を与える。その他でも、地下水を汚染したり、廃
棄物が気化或いは揮発した場合には大気を汚染して人体
に害を及ぼす。2. Description of the Related Art Soil contaminated with poorly water-soluble organic substances such as oil due to waste treatment in factories, oil leakage from oil tanks, illegal dumping of industrial waste, etc., has a great impact on the underground ecosystem. give. In addition, if ground water is polluted or waste is vaporized or volatilized, it pollutes the air and harms the human body.
【０００３】このような汚染土壌の修復方法には、汚染
物質（難水溶性有機物）やその形態によって様々な方法
が提案されている。それらは大別すると、掘削除去後の
焼却処理、囲い込み処理、セメント固化処理、土壌洗
浄、バイオレメーディエーション、化学的分解処理等に
分類される。そして、揮発性物質の不飽和土壌汚染の処
理方法としては、例えば真空抽出法等がある。Various methods have been proposed for repairing such contaminated soil depending on the pollutant (poorly water-soluble organic matter) and its form. They are roughly classified into incineration treatment after excavation removal, enclosure treatment, cement hardening treatment, soil washing, bioremediation, chemical decomposition treatment and the like. As a method for treating unsaturated soil contamination with volatile substances, for example, there is a vacuum extraction method.
【０００４】[0004]
【発明が解決しようとする課題】しかし、これらの方法
には、それぞれ以下のような問題点がある。汚染土壌の
掘削除去は、除去した土の処理に高濃度部を焼却する以
外に適当な処理方法がない。そして、焼却以外の処理方
法では、産業廃棄物としての処理が必要なため処理コス
トが嵩む。However, each of these methods has the following problems. For excavation and removal of contaminated soil, there is no suitable treatment method other than incineration of the high-concentration part for the treatment of the removed soil. And, in the treatment method other than incineration, treatment as industrial waste is required, so that the treatment cost increases.
【０００５】囲い込みは、汚染地帯自体を廃棄物処分場
とすることになるため、大規模な土木工事や処分後の永
久管理が必要となり、したがって、コストが高い。その
上、汚染された土壌或いは汚染物質（難水溶性有機物）
自体を無害化できないため、根本的な解決方法とはなら
ない。Since the contaminated area itself makes the contaminated area a waste disposal site, large-scale civil engineering work and permanent management after disposal are required, and therefore the cost is high. In addition, contaminated soil or pollutants (poorly water-soluble organic matter)
It is not a fundamental solution because it cannot be sanitized.
【０００６】セメント固化処理は、物理的に土壌内に汚
染物質等を封じ込めるので、経年劣化による汚染物質の
溶出も考えられる。結局、汚染物質をそのままの濃度で
地盤中に残すことになり、土壌を無害化する訳ではない
ので、やはり根本的な解決方法とはならない。[0006] Cement solidification treatment physically entraps contaminants and the like in the soil, so it is conceivable that the contaminants may elute due to deterioration over time. The end result is that pollutants remain in the ground at the same concentration and do not detoxify the soil, so it is not a fundamental solution.
【０００７】土壌洗浄は、プラント設備に多くのノウハ
ウが必要であり、コストが嵩む。そして、洗浄剤の選択
が難しい。大量の水を使用する場合には洗浄後の水処理
法にも課題が残っている。[0007] Soil cleaning requires a lot of know-how in plant equipment, which increases the cost. And it is difficult to select a cleaning agent. When a large amount of water is used, there remains a problem in the water treatment method after washing.
【０００８】化学分解は、過酸化水素等の酸化剤による
化学分解で、土壌中の汚染物質を直接分解して無害化で
きるが、結局土壌洗浄と同等以上の設備と大量の酸化剤
を必要とするためコストが嵩む。また、不完全分解によ
る中間生成物のコントロールが難しい。[0008] Chemical decomposition is chemical decomposition with an oxidizing agent such as hydrogen peroxide, and can directly decompose pollutants in soil to render them harmless, but eventually requires equipment equivalent to or more than soil cleaning and a large amount of oxidizing agent. Therefore, the cost increases. Also, it is difficult to control intermediate products due to incomplete decomposition.
【０００９】バイオレメーディエーションは、高濃度汚
染土の処理が困難であり、また、修復に長期間を必要と
する。さらに、活性微生物による生態系の変化等が問題
となる。Bioremediation is difficult to treat highly contaminated soil and requires a long period of time for restoration. Furthermore, changes in the ecosystem due to active microorganisms become a problem.
【００１０】真空抽出法は、有機塩素化合物等の揮発性
有機物質の土中ガス汚染を除去することが目的であり、
液体で高濃度に汚染された土の浄化には向かない。The vacuum extraction method is intended to remove soil gas pollution of volatile organic substances such as organic chlorine compounds,
It is not suitable for cleaning soils that are highly contaminated with liquids.
【００１１】また、油等の難水溶性有機物の処理は界面
活性剤で行うのが一般的である。しかし、人工の界面活
性剤によって油等を処理すると乳化してしまい、水との
分離が非常に困難である、という問題が存在する。The treatment of a poorly water-soluble organic substance such as oil is generally performed with a surfactant. However, there is a problem that when an oil or the like is treated with an artificial surfactant, the oil and the like are emulsified, and separation from water is extremely difficult.
【００１２】本発明は上記した従来技術の問題点に対処
するべく提案されたもので、例えば油等の難水溶性有機
物で汚染された土壌から汚染物質を分離処理することに
より汚染土壌を浄化する工法及び装置の提供を目的とし
ている。The present invention has been proposed to address the above-mentioned problems of the prior art. For example, the polluted soil is purified by separating the pollutant from the soil polluted with a poorly water-soluble organic substance such as oil. The purpose is to provide construction methods and equipment.
【００１３】[0013]
【課題を解決するための手段】本発明の土壌浄化工法
は、難水溶性有機物で汚染された土壌を水を入れた分離
槽に投入して混合する混合工程と、アルカリ剤を分離槽
に供給する工程と、気泡を分離槽へ供給して難水溶性有
機物を水面上まで浮上させる浮上工程、とを有してい
る。Means for Solving the Problems The soil purification method of the present invention comprises a mixing step of introducing soil mixed with a poorly water-soluble organic substance into a separation tank containing water and mixing, and supplying an alkaline agent to the separation tank. And a floating step of supplying bubbles to the separation tank to float the poorly water-soluble organic substance to the surface of the water.
【００１４】ここで、前記「難水溶性有機物で汚染され
た土壌」なる文言は、所謂「オイルサンド」をも含む概
念として、本明細書では用いられている。The term "soil contaminated with poorly water-soluble organic matter" is used herein as a concept including so-called "oil sand".
【００１５】本発明の実施に際して、難水溶性有機物で
汚染された土壌を分離槽に投入（前記混合工程）した後
に、アルカリ剤を分離槽に供給するのが好ましい。或い
は、難水溶性有機物で汚染された土壌及びアルカリ剤を
分離槽へ同時に供給しても良い。In the practice of the present invention, it is preferable that the alkaline agent is supplied to the separation tank after the soil contaminated with the poorly water-soluble organic substance is put into the separation tank (the mixing step). Alternatively, the soil contaminated with the poorly water-soluble organic matter and the alkaline agent may be simultaneously supplied to the separation tank.
【００１６】本発明の実施に際して、前記分離槽に酸化
剤を投入する酸化剤投入工程を有しており、前記気泡は
酸化剤の分解により発生した酸素ガスにより構成されて
いるのが好ましい。ここで前記酸化剤としては、過酸化
水素や、過炭酸ナトリウム、過ホウ酸ナトリウム、過ピ
ロリン酸ナトリウム、過リン酸ナトリウム等の様に水に
溶解すると過酸化水素を遊離する無機系酸化剤や、過酢
酸、過コハク酸、過グルタル酸、過安息香酸等の様な有
機系酸化剤や、カロ酸及びその無機塩、次亜塩素酸ナト
リウム、過塩素酸ナトリウムなどの様な塩素系酸化剤、
等であるのが好ましい。なお、これ等の酸化剤の添加量
は、土壌に対して０．０１重量％以上、好ましくは１〜
２０％に設定されている。In carrying out the present invention, it is preferable that the method has an oxidizing agent charging step of charging an oxidizing agent into the separation tank, and the bubbles are composed of oxygen gas generated by decomposition of the oxidizing agent. Here, as the oxidant, hydrogen peroxide, an inorganic oxidant that releases hydrogen peroxide when dissolved in water, such as sodium percarbonate, sodium perborate, sodium perpyrophosphate, sodium perphosphate, and the like. -Based oxidizers such as peracetic acid, persuccinic acid, perglutaric acid and perbenzoic acid, and chlorinated oxidizers such as caroic acid and its inorganic salts, sodium hypochlorite and sodium perchlorate. ,
Etc. are preferred. The amount of these oxidizing agents added is 0.01% by weight or more, preferably 1 to
It is set to 20%.
【００１７】一方、上記のアルカリ剤は、苛性ソーダ、
炭酸ソーダ、過炭酸ソーダ、消石灰、苛性カリ、炭酸カ
リ等である。なお、アルカリ剤の添加量は、酸化剤を添
加した後に土壌のｐＨが８以上になる様な数値であるの
が好ましい。On the other hand, the above alkaline agents are caustic soda,
Examples include sodium carbonate, sodium percarbonate, slaked lime, caustic potash, and potassium carbonate. The addition amount of the alkaline agent is preferably a value such that the pH of the soil becomes 8 or more after adding the oxidizing agent.
【００１８】この場合、難水溶性有機物で汚染された土
壌と、アルカリ剤と、前記酸化剤とを分離槽へ同時に供
給することも可能である。或いは、難水溶性有機物で汚
染された土壌を水を入れた分離槽に投入（混合工程）し
た後に、アルカリ剤及び酸化剤を分離槽へ同時に供給す
ることも可能である。In this case, it is also possible to simultaneously supply the soil contaminated with the poorly water-soluble organic matter, the alkaline agent and the oxidizing agent to the separation tank. Alternatively, after the soil contaminated with the poorly water-soluble organic matter is put into a separation tank containing water (mixing step), it is possible to simultaneously supply the alkaline agent and the oxidizing agent to the separation tank.
【００１９】また、前記気泡は炭酸塩化合物と酸との反
応により発生した炭酸ガスにより構成されているのが好
ましい。ここで前記炭酸塩としては、炭酸ナトリウム、
炭酸水素ナトリウム、炭酸カリウム、炭酸水素カリウ
ム、炭酸カルシウム、炭酸マグネシウムであるのが好ま
しい。It is preferable that the bubbles are formed of carbon dioxide gas generated by a reaction between a carbonate compound and an acid. Here, as the carbonate, sodium carbonate,
It is preferably sodium hydrogen carbonate, potassium carbonate, potassium hydrogen carbonate, calcium carbonate or magnesium carbonate.
【００２０】なお、難水溶性有機物で汚染された土壌と
アルカリ剤と酸化剤（酸を含む）とを、分離槽へ同時に
供給しても良い。勿論、難水溶性有機物で汚染された土
壌を水を入れた分離槽に投入（混合工程）した後に、炭
酸塩化合物（アルカリ剤）及び酸を分離槽へ同時に供給
しても良い。The soil contaminated with the poorly water-soluble organic matter, the alkaline agent and the oxidizing agent (including acid) may be simultaneously supplied to the separation tank. Of course, after the soil contaminated with the poorly water-soluble organic substance is put into the separation tank filled with water (mixing step), the carbonate compound (alkali agent) and the acid may be simultaneously supplied to the separation tank.
【００２１】これに加えて、前記気泡が空気により構成
されているのが好ましい。In addition to this, it is preferable that the bubbles are composed of air.
【００２２】さらに、前記分離槽の水温を所定温度より
も高温にするための加熱手段を備えているのが好まし
い。Further, it is preferable that a heating means for raising the water temperature of the separation tank to a temperature higher than a predetermined temperature is provided.
【００２３】本発明の土壌浄化工法において、前記浮上
工程において浮上した難水溶性有機物を、（例えば水流
により）分離槽から排出して油水分離槽に導入する排出
工程を有するのが好ましい。或いは、前記浮上工程にお
いて浮上した難水溶性有機物を、吸着部材により吸着し
て除去する吸着工程を有するのが好ましい。ここで、前
記吸着部材としては、例えばオイルスポンジ等の様なオ
イル吸着部材が用いられるのが好ましい。◎さらに、前
記排出工程と吸着工程とを共に行うことも可能である。
これに加えて、浮上した難水溶性有機物を凝縮或いは固
化する作用を有する粉末タイプの処理剤（例えば栗田工
業株式会社製の商品名「ロングクリンＳ−１００」）
や、シートタイプの処理剤（例えば栗田工業株式会社製
の商品名「ロングクリンＦＳ−１６６」）等を用いても
良い。In the soil purification method of the present invention, it is preferable to have a discharging step of discharging the poorly water-soluble organic matter floated in the floating step from the separation tank (for example, by water flow) and introducing it into the oil-water separation tank. Alternatively, it is preferable to have an adsorption step of adsorbing and removing the poorly water-soluble organic substance that has floated in the floating step. Here, as the suction member, it is preferable to use an oil suction member such as an oil sponge. ◎ Furthermore, it is possible to perform both the discharging step and the adsorption step.
In addition to this, a powder type treating agent having an action of condensing or solidifying the slightly water-soluble organic matter that has floated up (for example, trade name "Long Clean S-100" manufactured by Kurita Water Industries Ltd.)
Alternatively, a sheet type treating agent (for example, trade name “Long Clean FS-166” manufactured by Kurita Water Industries Ltd.) may be used.
【００２４】本発明の実施に際して、前記分離槽内の水
温は所定温度よりも高温であるのが好ましい。但し、
「所定温度」がどの様な数値であるのかは、難水溶性有
機物、アルカリ剤、酸化剤の種類や、各種施工条件等に
よって、常温から１００℃の間、特に４０℃から８０℃
の間から、ケース・バイ・ケースで定められる。ここ
で、「常温から１００℃の間、特に４０℃から８０℃」
という範囲は、アルカリ剤による難水溶性有機物の分離
及び酸化剤からのガスの気泡の発生による難水溶性有機
物の連行は水温が高いほど活発に行われるが、水温が余
りに高過ぎると分離槽内の混合液が沸騰してしまうこと
に着目して、設定されている。In carrying out the present invention, the water temperature in the separation tank is preferably higher than a predetermined temperature. However,
What kind of numerical value the "predetermined temperature" is, depending on the type of the poorly water-soluble organic substance, the alkali agent, the oxidizing agent, and various construction conditions, etc., is between room temperature and 100 ° C, especially 40 ° C to 80 ° C.
It will be determined on a case-by-case basis. Here, "between room temperature and 100 ℃, especially 40 ℃ -80 ℃"
The higher the water temperature, the more active the separation of the poorly water-soluble organic matter by the alkaline agent and the entrainment of gas-soluble gas bubbles from the oxidizer are. It is set by focusing on the fact that the mixed solution of boiled.
【００２５】本発明の土壌浄化装置は、難水溶性有機物
で汚染された土壌と水とが投入される分離槽と、アルカ
リ剤を分離槽に供給するアルカリ剤供給手段と、分離槽
に気泡を発生させる気泡発生手段とを有し、難水溶性有
機物を水面上まで浮上せしめることを特徴としている。The soil purifying apparatus of the present invention comprises a separation tank into which soil and water contaminated with poorly water-soluble organic matter are introduced, an alkaline agent supply means for supplying the alkaline agent to the separation tank, and bubbles to the separation tank. It is characterized in that it has a bubble generating means for generating, and makes a slightly water-soluble organic substance float to the surface of the water.
【００２６】本発明の実施に際して、前記気泡発生手段
は分離槽に酸化剤を供給する酸化剤供給手段を有し、前
記気泡は酸化剤の分解により発生した酸素ガスで構成さ
れているのが好ましい。或いは、前記アルカリ剤は炭酸
塩化合物であり、前記気泡発生手段は分離槽に酸を供給
する酸供給手段を有し、前記気泡は炭酸塩化合物と酸と
の反応により発生した炭酸ガスで構成されていても良
い。さらに、前記気泡発生手段は分離槽に空気を供給す
る空気供給手段を有し、前記気泡は空気で構成されてい
ても良い。In practicing the present invention, it is preferable that the bubble generating means has an oxidant supply means for supplying an oxidant to the separation tank, and the bubbles are composed of oxygen gas generated by decomposition of the oxidant. . Alternatively, the alkaline agent is a carbonate compound, the bubble generating means has an acid supply means for supplying an acid to the separation tank, and the bubbles are composed of carbon dioxide gas generated by the reaction of the carbonate compound and the acid. It may be. Further, the bubble generating means may have an air supply means for supplying air to the separation tank, and the bubbles may be made of air.
【００２７】これに加えて、前記分離槽の水温を所定温
度よりも高温にする加熱手段を備えているのが好まし
い。In addition to this, it is preferable to provide a heating means for raising the water temperature of the separation tank to a temperature higher than a predetermined temperature.
【００２８】また、本発明の実施に際して、前記酸化剤
から発生するガスの気泡が難水溶性有機物を連行して水
面上まで浮上させた際に、該浮上した難水溶性有機物だ
けを分離槽から排出する排出手段、を有するのが好まし
い。或いは、前記浮上工程において浮上した難水溶性有
機物を、吸着して除去する吸着部材を有するのが好まし
い。ここで、前記吸着部材としては、例えばオイルスポ
ンジ等の様なオイル吸着部材が用いられるのが好まし
い。さらに、前記排出手段と吸着部材とを共に具備する
ことも可能である。これに加えて、浮上した難水溶性有
機物を凝縮或いは固化する作用を有する粉末タイプの処
理剤（例えば栗田工業株式会社製の商品名「ロングクリ
ンＳ−１００」）や、シートタイプの処理剤（例えば栗
田工業株式会社製の商品名「ロングクリンＦＳ−１６
６」）等を分離槽に供給する処理剤供給手段を設けるの
が好ましい。In the practice of the present invention, when the gas bubbles generated from the oxidant carry the poorly water-soluble organic matter and float it to the surface of the water, only the slightly water-soluble organic matter that has floated out of the separation tank. It is preferable to have a discharging means for discharging. Alternatively, it is preferable to have an adsorption member that adsorbs and removes the hardly water-soluble organic matter that has floated in the floating step. Here, as the suction member, it is preferable to use an oil suction member such as an oil sponge. Further, it is possible to provide both the discharging means and the suction member. In addition to this, a powder type treatment agent (for example, product name “Long Clean S-100” manufactured by Kurita Kogyo Co., Ltd.) having a function of condensing or solidifying the slightly water-soluble organic matter that has floated, and a sheet type treatment agent ( For example, the product name “Long Clean FS-16” manufactured by Kurita Water Industries Ltd.
6 ") and the like are preferably provided in the separation tank.
【００２９】なお前記排出手段は浮上した難水溶性有機
物を水面上で移動せしめる流水手段と、浮上した難水溶
性有機物のみを分離槽から排出する堰手段、とを備えて
いるのが好ましい。上述した様な構成を具備する本発明
によれば、難水溶性有機物で汚染された土壌を、水を入
れた分離槽に投入して混合し、アルカリ剤をその分離槽
に供給するので、当該アルカリ剤の作用により、難水溶
性有機物は土壌から分離した状態或いは土壌から分離し
易い状態となる。そして、難水溶性有機物が土壌から分
離し或いは分離し易い状態となった後に、気泡発生手段
により分離槽内に気泡を供給或いは発生せしめれば、難
水溶性有機物は水面上まで浮上するのである。It is preferable that the discharging means includes a water flowing means for moving the floated hardly water-soluble organic matter on the water surface, and a weir means for discharging only the floated hardly water-soluble organic matter from the separation tank. According to the present invention having the above-described configuration, soil contaminated with a poorly water-soluble organic substance is charged into a separation tank containing water and mixed, and an alkaline agent is supplied to the separation tank. The action of the alkaline agent causes the poorly water-soluble organic matter to be in a state of being separated from the soil or a state of being easily separated from the soil. Then, after the poorly water-soluble organic matter is separated from the soil or easily separated from the soil, if bubbles are supplied or generated in the separation tank by the bubble generating means, the poorly water-soluble organic matter floats on the water surface. .
【００３０】気泡発生の態様としては、例えば酸化剤
（過酸化水素水溶液等）を前記分離槽へ投入し、常温、
或いは１００℃程度以下の高温下で混合した後、数十分
間から数日の範囲で放置すると、 Ｈ2 Ｏ2 →Ｈ2 Ｏ＋（１／２）Ｏ2 ↑ なる分解反応により、酸素ガスが発生する。As a mode of generating bubbles, for example, an oxidizing agent (hydrogen peroxide aqueous solution, etc.) is charged into the separation tank, and the temperature is kept at room temperature.
Alternatively, after mixing at a high temperature of about 100 ° C. or less, if the mixture is left for several tens of minutes to several days, oxygen gas is generated by a decomposition reaction of H 2 O 2 → H 2 O + (1/2) O 2 ↑. Occur.
【００３１】この酸素ガスは上述した気泡であり、その
まま浮上するかあるいはアルカリ剤によって土壌から分
離され易くなった難水溶性有機物を包囲する様に付着す
る。その結果、当該難水溶性有機物は酸素の気泡の上昇
に連行され分離して上昇し、分離槽の水面に浮上する。The oxygen gas is the above-mentioned air bubbles, and floats as it is or adheres so as to surround the poorly water-soluble organic substance which is easily separated from the soil by the alkaline agent. As a result, the poorly water-soluble organic substance is entrained by the rise of oxygen bubbles, separates and rises, and floats on the water surface of the separation tank.
【００３２】ここで、酸化剤を分離槽へ投入し、この分
解により発生する酸素ガスの気泡により連行して難水溶
性有機物を浮上させることは、酸化剤が分解して発生す
る酸素の気泡の大きさが非常に小さい上に、酸化剤が難
水溶性有機物を酸化分解し、土壌から難水溶性有機物を
剥離し易くすると共に、土壌表面で酸化剤が分解して酸
素を発生し、物理的作用によっても難水溶性有機物を剥
離するので、最も好ましい。Here, the oxidizing agent is introduced into the separation tank, and the hardly water-soluble organic matter is floated by being entrained by the bubbles of oxygen gas generated by the decomposition, which means that the bubbles of oxygen generated by the decomposition of the oxidizing agent are generated. In addition to being very small in size, the oxidant oxidizes and decomposes the poorly water-soluble organic matter, making it easy to peel off the poorly water-soluble organic matter from the soil, and at the same time, the oxidant decomposes on the soil surface to generate oxygen and It is most preferable because the slightly water-soluble organic substance is also peeled off by the action.
【００３３】油水分離槽における難水溶性有機物の除去
は、例えばオイルスポンジ吸着処理や、複数の油水分離
槽を設けて前記堰と同様な部材を介して該複数の油水分
離槽を連通させ、或いは、オイルスポンジ吸着処理及び
堰による処理の双方を同時に行うことにより為される。For removing the poorly water-soluble organic matter in the oil / water separation tank, for example, an oil sponge adsorption treatment, a plurality of oil / water separation tanks are provided and the plurality of oil / water separation tanks are communicated with each other via a member similar to the weir, or , The oil sponge adsorption treatment and the weir treatment are simultaneously performed.
【００３４】すなわち浮上した難水溶性有機物は、例え
ば分離槽から堰を介して排出され、油水分離槽に導入さ
れ処理される。或いは、難水溶性有機物は吸着手段によ
り吸着されて、分離槽から除去される。That is, the slightly water-soluble organic matter that has floated is discharged from, for example, a separation tank through a weir, and introduced into an oil / water separation tank for treatment. Alternatively, the poorly water-soluble organic substance is adsorbed by the adsorption means and removed from the separation tank.
【００３５】ここで、分離槽から堰を介して排出され、
油水分離槽に導入されるのは、殆どが酸素ガスにより連
行されて浮上した難水溶性有機物であり、分離槽内の水
や土壌が油水分離槽に供給される量は、極めて小量であ
る。すなわち、この段階で難水溶性有機物の分離が行わ
れる。Here, the separation tank is discharged through a weir,
Most of what is introduced into the oil-water separation tank is the hardly water-soluble organic matter that is entrained by oxygen gas and floated, and the amount of water and soil in the separation tank supplied to the oil-water separation tank is extremely small. . That is, at this stage, the poorly water-soluble organic substance is separated.
【００３６】本発明によって土壌から分離させる効果の
ある汚染物質は、原油、及びその加工品である石油系炭
化水素類（燃料油、軽油、重油等）、植物性加工油、及
び各種難水溶性の有機化合物等である。なお、前述した
通り、本明細書においては「難水溶性有機物で汚染され
た土壌」なる文言は、「オイルサンド」も含むものとし
て本明細書では用いられているので、オイルサンドから
の油分抽出技術に本発明を適用することが可能である。The pollutants having an effect of separating from soil according to the present invention include crude oil and processed petroleum hydrocarbons (fuel oil, light oil, heavy oil, etc.), vegetable processed oil, and various poorly water-soluble substances. And organic compounds. As described above, in this specification, the term "soil contaminated with poorly water-soluble organic matter" is used in the present specification as including "oil sand". The present invention can be applied to technology.
【００３７】[0037]
【発明の実施の形態】以下、図面を参照して本発明の実
施の形態を説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００３８】図１において、分離槽４には、ヒータ１０
を内装した温水タンク７からポンプ１１を介して給水さ
れており、一方、バックホー１で掘削された汚染した土
壌Ｄが受ホッパ２に運搬されてロータリフィーダ３によ
り分離槽４に投入されている。そして、アルカリ剤供給
手段であるアルカリ剤タンク５からアルカリ剤、例えば
苛性ソーダがポンプ１１を介して分離槽４に供給されて
いる。一方、酸化剤供給手段である酸化剤タンク６から
は酸化剤、例えば過酸化水素が、ポンプ１１を介して分
離槽４に供給されている。ここで、温水、アルカリ剤、
及び酸化剤の各々は、制御弁１２によって供給量が制御
されている。In FIG. 1, a heater 10 is provided in the separation tank 4.
The contaminated soil D excavated by the backhoe 1 is transported to the receiving hopper 2 and put into the separation tank 4 by the rotary feeder 3. Then, an alkali agent, for example, caustic soda, is supplied to the separation tank 4 via a pump 11 from an alkali agent tank 5 serving as an alkali agent supply unit. On the other hand, an oxidant, for example, hydrogen peroxide, is supplied from the oxidant tank 6 serving as an oxidant supply means to the separation tank 4 via the pump 11. Where hot water, alkaline agent,
The supply amount of each of the oxidizing agent and the oxidizing agent is controlled by the control valve 12.
【００３９】分離槽４には撹拌機８が設けられ、また、
底部には水温を所定温度以上にせしめる加熱手段である
ヒータ９が設けられている。そして、分離槽４内の水温
を反応に好適な所定の温度に維持されている。The separating tank 4 is provided with a stirrer 8, and
At the bottom, a heater 9 is provided as a heating means for keeping the water temperature above a predetermined temperature. The water temperature in the separation tank 4 is maintained at a predetermined temperature suitable for the reaction.
【００４０】そして、酸化剤から発生する酸素ガスの気
泡が難水溶性有機物を包囲して水面上まで浮上した際
に、その難水溶性有機物のみを分離槽４から排出する排
出手段として、堰手段であるノッチ１５が設けられてい
る。すなわち、分離槽４と隣接する第１の油水分離槽１
３と、さらに第２の油水分離槽１４とが堰手段であるノ
ッチ１５を介して連通されている。When the bubbles of oxygen gas generated from the oxidant surround the poorly water-soluble organic matter and float to the surface of the water, only the poorly water-soluble organic matter is discharged from the separation tank 4 as a weir means. Notch 15 is provided. That is, the first oil / water separation tank 1 adjacent to the separation tank 4
3 and the second oil-water separation tank 14 are communicated with each other via a notch 15 which is a weir means.
【００４１】ここで、図２で示す該ノッチ部の断面から
明らかな様に、厚さ寸法Ｈに相当する領域に存在する流
体のみがノッチ１５を介して隣接する油水分離槽１３に
流入する。そして分離槽４において、該厚さＨに相当す
る領域には、水面上に浮上した油層（酸素ガスの気泡で
包囲された難水溶性有機物の層）が存在する。そのた
め、ノッチ１５を介して油水分離槽１３に流入する流体
中に含有されている難水溶性有機物の量は非常に多い。Here, as is clear from the cross section of the notch portion shown in FIG. 2, only the fluid existing in the region corresponding to the thickness dimension H flows into the adjacent oil / water separation tank 13 via the notch 15. In the separation tank 4, a region corresponding to the thickness H has an oil layer (a layer of a poorly water-soluble organic material surrounded by bubbles of oxygen gas) floating above the water surface. Therefore, the amount of the poorly water-soluble organic matter contained in the fluid flowing into the oil-water separation tank 13 through the notch 15 is very large.
【００４２】第１及び第２の油水分離槽１３、１４の上
方には、浮遊する難水溶性有機物を吸着するオイル吸着
処理装置２０が配設されている。ここで、オイル吸着処
理装置２０は、オイルスポンジの様なオイル吸着部材に
限定されるものでは無く、繊維製の吸着部材その他であ
っても良い。また、浮上した難水溶性有機物を凝縮或い
は固化する作用を有する粉末タイプの処理剤（例えば栗
田工業株式会社製の商品名「ロングクリンＳ−１０
０」）や、シートタイプの処理剤（例えば栗田工業株式
会社製の商品名「ロングクリンＦＳ−１６６」）等を分
離槽に供給する処理剤供給手段であっても良い。Above the first and second oil / water separation tanks 13 and 14, an oil adsorption treatment device 20 for adsorbing the floating poorly water-soluble organic substance is arranged. Here, the oil adsorption processing device 20 is not limited to an oil adsorption member such as an oil sponge, and may be a fiber adsorption member or the like. Further, a powder type treating agent having an action of condensing or solidifying the floating hardly water-soluble organic substance (for example, “Longclean S-10” manufactured by Kurita Kogyo Co., Ltd.)
0 ") or a sheet-type treating agent (for example," Longclean FS-166 "manufactured by Kurita Kogyo Co., Ltd.) or the like may be supplied to the separation tank.
【００４３】また、第２の油水分離槽１４の上方の管路
は、乳化処理槽１７を介して中和処理槽１８に連通して
いる。一方、第２の油水分離槽１４の下方の管路は中和
処理槽１８へ直接に連通している。そして、中和処理槽
１８から最終チェック槽１９に供給され、そこから排水
されている。The pipe line above the second oil-water separation tank 14 communicates with the neutralization processing tank 18 via the emulsification processing tank 17. On the other hand, a pipe below the second oil / water separation tank 14 is directly in communication with the neutralization tank 18. Then, the water is supplied from the neutralization tank 18 to the final check tank 19, from which it is drained.
【００４４】分離槽４、油水分離槽１３、１４に沈澱し
た浄化土Ｓの脱水処理装置として、図３に示す振動ふる
い機２１が設けられている。そして、振動ふるい機２１
でふるい分けられた粗粒土Ｓ１を排出するベルトコンベ
ア２３と、スラリータンク２２に溜まった微細粒土を微
粒子土Ｓ２と細粒土Ｓ３に分離するサイクロン２４と、
遠心分離機２５、とが設けられている。なお、遠心分離
機２５の代わりに脱水プレス機（図示せず）を使用して
も良い。A vibrating and sieving machine 21 shown in FIG. 3 is provided as a dehydrating apparatus for the purified soil S deposited in the separation tank 4 and the oil / water separation tanks 13 and 14. And the vibration sieving machine 21
A belt conveyor 23 that discharges the coarse-grained soil S1 that has been sieved with a cyclone 24 that separates the fine-grained soil accumulated in the slurry tank 22 into the fine-grained soil S2 and the fine-grained soil S3,
A centrifuge 25, and are provided. A dewatering press (not shown) may be used instead of the centrifuge 25.
【００４５】次に土壌浄化工法の態様を説明する。図１
に示すように、汚染された土壌Ｄはバックホー１により
掘削されて受ホッパ２に運ばれ、ロータリフィーダ３に
よって分離槽４に投入される。一方、水Ｗ１が温水タン
ク７に給水され、ヒータ１０で加熱され、ポンプ１１、
制御弁１２を介して分離槽４に供給され、分離槽４内で
は汚染土壌Ｄと撹拌機８により混合される（混合工
程）。なお、分離槽４内は、ヒータ９により水温は一定
温度に維持されている。Next, an aspect of the soil purification method will be described. FIG.
As shown in FIG. 3, the contaminated soil D is excavated by the backhoe 1, carried to the receiving hopper 2, and put into the separation tank 4 by the rotary feeder 3. On the other hand, water W1 is supplied to the hot water tank 7, heated by the heater 10, and pumped by the pump 11.
It is supplied to the separation tank 4 via the control valve 12, and is mixed with the contaminated soil D by the stirrer 8 in the separation tank 4 (mixing step). The water temperature in the separation tank 4 is maintained at a constant temperature by the heater 9.
【００４６】次に、アルカリ剤タンク５内のアルカリ剤
Ａがポンプ１１、制御弁１２を介して分離槽４に供給さ
れ、供給されたアルカリ剤Ａにより難水溶性有機物は土
壌Ｄから分離される（分離工程）。Next, the alkaline agent A in the alkaline agent tank 5 is supplied to the separation tank 4 via the pump 11 and the control valve 12, and the hardly alkaline organic matter is separated from the soil D by the supplied alkaline agent A. (Separation step).
【００４７】次に、酸化剤タンク６から酸化剤Ｏがポン
プ１１、制御弁１２を介して分離槽４に供給する（酸化
剤投入工程）。そして、酸化剤Ｏから発生する酸素ガス
等の気泡が難水溶性有機物を連行して、水面上まで浮上
させる（浮上工程）。Next, the oxidant O is supplied from the oxidant tank 6 to the separation tank 4 via the pump 11 and the control valve 12 (oxidant injection step). Then, bubbles such as oxygen gas generated from the oxidizing agent O entrain the poorly water-soluble organic substance and float up to the surface of the water (floating step).
【００４８】水面上に浮上した難水溶性有機物は、図２
に示すようにその厚さＨだけがノッチ１５を通って第１
の油水分離槽１３に、さらに、ノッチ１６を通って第２
の油水分離槽１４に排出される（排出工程）。そして、
第１及び第２の油水分離槽１３、１４の上面に浮遊する
難水溶性有機物はオイルスポンジ吸着処理装置２０によ
り吸着され、回収される。The poorly water-soluble organic matter floating on the water surface is shown in FIG.
Only its thickness H passes through the notch 15 to the first
To the oil / water separation tank 13 through the notch 16
(Discharge step). And
The poorly water-soluble organic substances floating on the upper surfaces of the first and second oil / water separation tanks 13 and 14 are adsorbed and collected by the oil sponge adsorption treatment device 20.
【００４９】第２の油水分離槽１４の上澄みは乳化油処
理槽１７に排出され、処理されてから中和処理槽１８に
排出され、また、第２の油水分離槽１４の下方からは直
接中和処理槽１８に排出される。そして、中和処理後、
最終チェック槽１９を介してＷ２に排水あるいは循環さ
れ再び利用される。The supernatant of the second oil-water separation tank 14 is discharged to the emulsified oil treatment tank 17, processed and then discharged to the neutralization treatment tank 18, and directly discharged from below the second oil-water separation tank 14. It is discharged to the sum treatment tank 18. And after the neutralization treatment,
It is drained or circulated to W2 through the final check tank 19 and reused.
【００５０】図３に示すように、分離槽４、及び油水分
離槽１３、１４に沈澱した浄化土スラリＳは、振動ふる
い機２１でふるい分けられ、粗い粗粒土Ｓ１はベルトコ
ンベア２３で排出されて埋戻し土として再利用され、ス
ラリータンク２２に溜まった微細粒土はサイクロン２４
でさらに分離され、遠心分離機２５に送られて、脱水処
理され、微粒子土Ｓ２、細粒土Ｓ３として再利用され
る。As shown in FIG. 3, the purified soil slurry S settled in the separation tank 4 and the oil / water separation tanks 13 and 14 is sieved by the vibrating sieving machine 21, and the coarse coarse soil S1 is discharged by the belt conveyor 23. The fine-grained soil accumulated in the slurry tank 22 after being reused as backfill soil is cyclone 24
Further separated, sent to the centrifuge 25, dehydrated, and reused as fine particle soil S2 and fine particle soil S3.
【００５１】上述した実施例においては、アルカリ剤Ａ
を供給した後（分離工程の後）、酸化剤Ｏを供給（酸化
剤投入工程を実施）している。これに対して、アルカリ
剤Ａと酸化剤Ｏとを同時に供給して、アルカリ剤により
難水溶性有機物を土壌から分離すると共に、酸化剤から
発生するガスの気泡により難水溶性有機物を連行して水
面上まで浮上させても良い（アルカリ剤及び酸化剤投入
工程）。In the above embodiment, the alkaline agent A
Is supplied (after the separation step), the oxidant O is supplied (the oxidant injection step is performed). On the other hand, the alkali agent A and the oxidant O are simultaneously supplied to separate the poorly water-soluble organic matter from the soil by the alkali agent, and the poorly water-soluble organic matter is entrained by gas bubbles generated from the oxidant. It may be floated to the surface of the water (alkali agent and oxidizing agent charging step).
【００５２】図１−３で示す実施形態においては、酸化
剤Ｏから発生する酸素ガス等の気泡により連行された難
水溶性有機物が分離槽４の水面上まで浮上（浮上工程）
した後に、第１の油水分離槽１３及び第２の油水分離槽
１４に排出（排出工程）され、その際に、油水分離槽１
３、１４の上面に浮遊する難水溶性有機物がオイル吸着
処理装置２０により吸着され、回収されている。In the embodiment shown in FIGS. 1-3, the slightly water-soluble organic substance entrained by bubbles such as oxygen gas generated from the oxidant O floats above the water surface of the separation tank 4 (floating step).
After that, it is discharged to the first oil / water separation tank 13 and the second oil / water separation tank 14 (discharge step).
The poorly water-soluble organic substances floating on the upper surfaces of the liquids 3 and 14 are adsorbed and collected by the oil adsorption treatment device 20.
【００５３】しかし、図１−３の実施形態において、オ
イル吸着処理装置２０を設けなくても良い（吸着処理装
置２０を設けていない実施形態は図示せず）。However, in the embodiment of FIGS. 1-3, the oil adsorption treatment device 20 may not be provided (an embodiment in which the adsorption treatment device 20 is not provided is not shown).
【００５４】或いは、図４で示す様に、油水分離槽１
３、１４へ排出すること（排出工程）無く、分離槽４に
吸着処理装置２０ａを設け、浮上した難水溶性有機物を
該処理装置２０ａにより吸着して（或いは処理して）除
去しても良い。Alternatively, as shown in FIG. 4, the oil / water separation tank 1
It is also possible to install the adsorption treatment device 20a in the separation tank 4 and remove the floating hardly water-soluble organic substance by adsorption (or treatment) by the treatment device 20a without discharging it to 3 and 14 (discharging step). .
【００５５】なお図４の実施形態において、吸着処理装
置２０ａにより分離槽４から難水溶性有機物を吸着除去
した後の工程は、図１−３の実施形態において油水分離
槽１３、１４の下流側の工程と概略同様であるため、図
示及び説明は省略する。In the embodiment shown in FIG. 4, the step after the hardly water-soluble organic matter is adsorbed and removed from the separation tank 4 by the adsorption treatment device 20a is the downstream side of the oil-water separation tanks 13 and 14 in the embodiment shown in FIGS. Since the process is substantially the same as the process described above, the illustration and description are omitted.
【００５６】なお、図示の実施形態では気泡を構成する
気体としては酸素ガスが例示され、後述する実施例では
空気が例示されているが、本発明に必要な気泡を構成す
る気体は、この２種類に限定されるものではない。例え
ば二酸化炭素、窒素ガス、水素ガス、或いは、ヘリウ
ム、アルゴン等の不活性ガスで構成される気泡を発生さ
せても良い。In the illustrated embodiment, oxygen gas is exemplified as the gas forming the bubbles, and air is exemplified in the examples described later, but the gas forming the bubbles necessary for the present invention is The type is not limited. For example, bubbles composed of carbon dioxide, nitrogen gas, hydrogen gas, or an inert gas such as helium or argon may be generated.
【００５７】[0057]
【実施例】浄化効果確認試験について説明する。（実施
例−１） 汚染を浄化し難い重質の油を０．４２ｇ（重量比約４％
程度）を含む汚染土壌１０ｇに、アルカリ剤と３％過酸
化水素水１００ｍｌとを添加後、撹拌混合して、常温
（２０℃）で１２時間放置した。これを静置して、土
壌、水、油に分離した後、水と油の上澄み液を廃棄し、
土壌部分のみ（残存土壌）を取り出して、これを分析資
料とした。EXAMPLE A purification effect confirmation test will be described. (Example-1) 0.42 g (weight ratio about 4%) of heavy oil that is difficult to clean up pollution
After adding an alkaline agent and 100 ml of 3% hydrogen peroxide solution to 10 g of contaminated soil containing the same, the mixture was stirred and mixed, and left at room temperature (20 ° C.) for 12 hours. Let it stand and separate it into soil, water and oil, then discard the supernatant of water and oil,
Only the soil part (residual soil) was taken out and used as the analytical data.
【００５８】分析に際しては、土壌１ｇをビーカーにと
り、塩酸を加えてｐＨ２以下とした後、硫酸マグネシウ
ム水和物２５ｇを加え、撹拌して、薄く広げて１５分〜
３０分程度放置し、凝固させた。この凝固物を乳鉢で粉
砕して円筒濾紙に入れ、該円筒濾紙に更にガラスビーズ
を満たして、ソックスレー抽出器に収めた。そして、ヘ
キサンを用い毎時２０回程度の循環速度で４時間抽出を
行った。For the analysis, 1 g of soil was placed in a beaker, hydrochloric acid was added to adjust the pH to 2 or less, 25 g of magnesium sulfate hydrate was added, and the mixture was stirred and spread thinly for 15 minutes or more.
It was left for about 30 minutes to coagulate. The coagulated product was crushed in a mortar and put into a cylindrical filter paper, the cylindrical filter paper was further filled with glass beads, and the soak tray was placed in a Soxhlet extractor. Then, extraction was performed for 4 hours using hexane at a circulation rate of about 20 times per hour.
【００５９】抽出後、フラスコを取り出し、８０℃程度
の水浴中で加温しながら、空気または窒素を吹き込ん
で、ヘキサンを揮散させた。さらに、８０℃の乾燥機中
で３０分間乾燥して、デシケータ内で３０分間放冷した
後、質量を測定し、ヘキサン抽出物質量を算出した。After the extraction, the flask was taken out, and air or nitrogen was blown into it while heating in a water bath at about 80 ° C. to vaporize hexane. Furthermore, after drying in a dryer at 80 ° C. for 30 minutes and cooling in a desiccator for 30 minutes, the mass was measured, and the amount of hexane extractable substance was calculated.
【００６０】その結果、アルカリ剤として過炭酸ソーダ
１．０ｇ（ｐＨ９．７）を用いた場合には、残存土壌中
の油分濃度は１．２０％となり、土壌からの油の除去率
は７１％となった。また、アルカリ剤として炭酸ソーダ
１．０ｇ（ｐＨ９．９）を用いた場合には、残存土壌中
の油分濃度は０．８１％となり、土壌からの油の除去率
は８０％となった。さらに、アルカリ剤として苛性ソー
ダ１．０ｇ（ｐＨ１０．８）を用いた場合には、残存土
壌中の油分濃度は０．８８％となり、土壌からの油の除
去率は７９％となった。なお、図５は、実施例−１の結
果を表にして示す図である。As a result, when 1.0 g of sodium percarbonate (pH 9.7) was used as the alkaline agent, the oil concentration in the residual soil was 1.20%, and the oil removal rate from the soil was 71%. Became. When sodium carbonate 1.0 g (pH 9.9) was used as the alkaline agent, the oil concentration in the residual soil was 0.81%, and the oil removal rate from the soil was 80%. Furthermore, when caustic soda 1.0 g (pH 10.8) was used as the alkaline agent, the oil concentration in the residual soil was 0.88%, and the oil removal rate from the soil was 79%. FIG. 5 is a table showing the results of Example-1.
【００６１】次に、実施例−１とは別の浄化効果の確認
試験について、説明する（実施例−２）。Next, a confirmation test of the purification effect different from that of Example-1 will be described (Example-2).
【００６２】重質の油を０．３４ｇを含む汚染土壌１０
ｇに過酸化水素（３５％）０．２８６ｇと苛性ソーダ水
溶液（０．５％）２０ｇを添加混合した後（過酸化水素
０．５％、ｐＨ１２）、４０度Ｃで２時間放置した。こ
の間２０分おきに６回撹拌した。静置して土壌、水、油
に分離した後、それぞれｎ−ヘキサン約２０ｍｌを加
え、十分混合してｎ−ヘキサンで油分を抽出し、ヘキサ
ン層をＮｏ．５Ａ濾紙で濾過した。この操作を４回繰り
返し、ヘキサンを揮発させて残分を回収油分とした。こ
の結果、それぞれの層から回収した油分は以下の通りで
あった。10 contaminated soil containing 0.34 g of heavy oil
After adding 0.286 g of hydrogen peroxide (35%) and 20 g of a caustic soda aqueous solution (0.5%) to g (hydrogen peroxide 0.5%, pH 12), the mixture was allowed to stand at 40 ° C. for 2 hours. During this time, the mixture was stirred 6 times every 20 minutes. After leaving still and separating into soil, water, and oil, about 20 ml of n-hexane was added, respectively, and mixed sufficiently to extract oil with n-hexane. It was filtered with 5A filter paper. This operation was repeated four times, and hexane was volatilized, and the residue was used as a recovered oil. As a result, the oil recovered from each layer was as follows.
【００６３】 土壌 ０．０２ｇ（土壌からの油の除去率 ９４％） 水 ０．０２ｇ 油 ０．３０ｇ（油の回収率 ８８％） 図６は、本発明の別の形態における作用効果を確認する
ための実験例に関するものである（実験例−２）。Soil 0.02 g (oil removal rate from soil 94%) Water 0.02 g Oil 0.30 g (oil recovery rate 88%) FIG. 6 confirms the action and effect in another form of the present invention. It relates to an experimental example for (Experimental example-2).
【００６４】図６において、容器３０内に難水溶性有機
物（重油）で汚染された土壌Ｄ及び水Ｗを入れる。そし
て、先端部にエアレーション用の気泡発生手段３２を取
り付けたチューブ３４を、容器３０内に配置する。ここ
でチューブ３４は、土壌Ｄが沈殿している領域に気泡発
生手段３２が位置する様に配置されている。In FIG. 6, a soil D and water W contaminated with a poorly water-soluble organic substance (heavy oil) are put in a container 30. Then, the tube 34 having the bubble generating means 32 for aeration attached to its tip is placed in the container 30. Here, the tube 34 is arranged so that the bubble generating means 32 is located in the region where the soil D is precipitated.
【００６５】チューブ３４の他端部は、空気供給手段３
６に接続されている。その結果、空気供給手段３６から
送られる空気は、チューブ３４、気泡発生手段３２を介
して、無数の微細気泡となって汚染土壌Ｄの層内から噴
出し、矢印３８で示す様に水面まで上昇する。The other end of the tube 34 is connected to the air supply means 3
6 is connected. As a result, the air sent from the air supply means 36 becomes a myriad of fine bubbles through the tube 34 and the bubble generation means 32, and is ejected from the layer of the contaminated soil D and rises to the water surface as shown by an arrow 38. To do.
【００６６】この容器３０内にアルカリ剤として苛性ソ
ーダを投入した後に、空気供給手段３６を起動して、気
泡発生手段３２を介して無数の微細気泡を発生させた結
果、難水溶性有機物（重油）が水面上に浮上した。すな
わち、土壌Ｄから難水溶性有機物が除去されたのであ
る。After caustic soda as an alkaline agent was put into the container 30, the air supply means 36 was activated to generate innumerable fine bubbles through the bubble generating means 32, resulting in a poorly water-soluble organic substance (heavy oil). Surfaced above the water. That is, the poorly water-soluble organic matter was removed from the soil D.
【００６７】一方、ブランクテストとして、苛性ソーダ
を投入せずに空気供給手段３６を作動して汚染土壌Ｄの
層内から無数の微細気泡を発生させた。しかし、この場
合は土壌Ｄから難水溶性有機物（重油）は水面まで浮上
しなかった。すなわち、土壌Ｄから難水溶性有機物（重
油）は分離されなかった。On the other hand, as a blank test, without supplying caustic soda, the air supply means 36 was operated to generate innumerable fine bubbles from the layer of the contaminated soil D. However, in this case, the poorly water-soluble organic matter (heavy oil) did not float from the soil D to the water surface. That is, the poorly water-soluble organic matter (heavy oil) was not separated from the soil D.
【００６８】この実験結果から、単に気泡を発生させた
のみでは、本発明の様な作用効果は得られないことが明
らかになった。From the results of this experiment, it became clear that the effect of the present invention cannot be obtained by merely generating bubbles.
【００６９】[0069]
【発明の効果】以上説明した様に、本発明によれば、特
別な機械的処理を行わなくても、油等の難水溶性有機物
で汚染された土壌から汚染物質を分離浄化することが出
来る。そして、洗浄後の廃水処理についても、水と油等
の難水溶性物質が分離されているため、簡単に処理を行
うことができる。さらに、分離した油を処理して回収す
ることが可能である。As described above, according to the present invention, it is possible to separate and purify pollutants from soil contaminated with poorly water-soluble organic substances such as oil without special mechanical treatment. . In addition, the wastewater treatment after washing can be easily performed because the hardly water-soluble substances such as water and oil are separated. Furthermore, it is possible to process and recover the separated oil.
【図１】本発明の一実施形態の施工手順を示すブロック
図。FIG. 1 is a block diagram showing a construction procedure according to an embodiment of the present invention.
【図２】ノッチ部の断面構造を示す図。FIG. 2 is a diagram showing a cross-sectional structure of a notch portion.
【図３】沈澱した浄化土の脱水処理の説明図。FIG. 3 is an explanatory view of dehydration treatment of the precipitated purified soil.
【図４】本発明の他の実施形態の施工手順を示すブロッ
ク図。FIG. 4 is a block diagram showing a construction procedure of another embodiment of the present invention.
【図５】本発明の１実施例を表で示す図。FIG. 5 is a table showing one embodiment of the present invention.
【図６】本発明の効果を確認するための実験装置を説明
するブロック図。FIG. 6 is a block diagram illustrating an experimental device for confirming the effects of the present invention.
Ｄ・・・汚染した土壌 Ａ・・・アルカリ剤 Ｏ・・・酸化剤 Ｓ・・・浄化土 １・・・バックホー ２・・・受ホッパ ３・・・ロータリフィーダ ４・・・分離槽 ５・・・アルカリ剤タンク ６・・・酸化剤タンク ７・・・温水タンク ８・・・撹拌機 ９、１０・・・ヒータ １１・・・ポンプ １２・・・制御弁 １３、１４・・・油水分離槽 １５、１６・・・ノッチ １７・・・乳化油処理槽 １８・・・中和処理槽 １９・・・最終チェック槽 ２０、２０ａ・・・オイル吸着処理装置 ２１・・・振動ふるい機 ２２・・・スラリータンク ２３・・・ベルトコンベア ２４・・・サイクロン ２５・・・遠心分離機 D: Contaminated soil A ... Alkaline agent O ... Oxidizing agent S ... Purified soil 1 ... Backhoe 2 ... Receiving hopper 3 ... Rotary feeder 4 ... Separation tank 5. ..Alkaline agent tank 6 ... Oxidizing agent tank 7 ... Warm water tank 8 ... Stirrer 9, 10 ... Heater 11 ... Pump 12 ... Control valve 13, 14 ... Oil-water separation Tanks 15 and 16 ... Notches 17 ... Emulsified oil treatment tank 18 ... Neutralization treatment tank 19 ... Final check tank 20, 20a ... Oil adsorption treatment device 21 ... Vibration sieving machine 22. ..Slurry tank 23 ... Belt conveyor 24 ... Cyclone 25 ... Centrifuge
───────────────────────────────────────────────────── フロントページの続き (72)発明者 川 端 淳 一 東京都調布市飛田給二丁目19番１号 鹿島 建設株式会社技術研究所内 (72)発明者 土 弘 道 夫 東京都調布市飛田給二丁目19番１号 鹿島 建設株式会社技術研究所内 (72)発明者 今 立 文 雄 東京都調布市飛田給二丁目19番１号 鹿島 建設株式会社技術研究所内 (72)発明者 佐 藤 亜紀子 東京都調布市飛田給二丁目19番１号 鹿島 建設株式会社技術研究所内 (72)発明者 町 田 靖 東京都港区虎ノ門一丁目２番８号 日本パ ーオキサイド株式会社内 (72)発明者 橋 本 昭 広 福島県郡山市横塚５丁目２番15号 日本パ ーオキサイド株式会社技術サービスセンタ ー内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junichi Kawabata 192-1 Tobita, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute (72) Inventor Hiromichi Dochi 2-chome, Tobita, Chofu-shi, Tokyo 19-1 Kashima Construction Co., Ltd., Technical Research Institute (72) Inventor Fumio Imadate 19-1 Tobita, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute (72) Inventor Akiko Sato Chofu, Tokyo Tobita Syo 2-Chome 19-1 Kashima Construction Co., Ltd. Technical Research Institute (72) Inventor Yasushi Machida 1-2-8 Toranomon, Minato-ku, Tokyo Japan Peroxide Co., Ltd. (72) Inventor Aki Hashimoto Hiro Fukushima Prefecture 5-21 Yokozuka, Koriyama City, Japan Technical Service Center, Peroxide Co., Ltd.
Claims (13)
入れた分離槽に投入して混合する混合工程と、アルカリ
剤を分離槽に供給する工程と、気泡を分離槽へ供給して
難水溶性有機物を水面上まで浮上させる浮上工程、とを
有することを特徴とする土壌浄化工法。1. A mixing step of introducing soil mixed with a poorly water-soluble organic substance into a separation tank containing water and mixing, a step of supplying an alkaline agent to the separation tank, and supplying air bubbles to the separation tank. And a floating step of floating a hardly water-soluble organic substance to the surface of the water, and a soil purification method.
ルカリ剤が分離槽へ同時に供給される請求項１の土壌浄
化工法。2. The soil purification method according to claim 1, wherein the soil contaminated with the poorly water-soluble organic matter and the alkaline agent are simultaneously supplied to the separation tank.
入工程を有しており、前記気泡は酸化剤の分解により発
生した酸素ガスにより構成される請求項１、２のいずれ
かの土壌浄化工法。3. The soil according to claim 1, further comprising an oxidizing agent charging step of charging an oxidizing agent into the separation tank, wherein the bubbles are composed of oxygen gas generated by decomposition of the oxidizing agent. Purification method.
ルカリ剤と、前記酸化剤とが分離槽へ同時に供給される
請求項３の土壌浄化工法。4. The soil purification method according to claim 3, wherein the soil contaminated with the poorly water-soluble organic matter, the alkaline agent, and the oxidizing agent are simultaneously supplied to the separation tank.
より発生した炭酸ガスにより構成される請求項１−３の
いずれか１項の土壌浄化工法。5. The soil purification method according to claim 1, wherein the bubbles are composed of carbon dioxide gas generated by a reaction between a carbonate compound and an acid.
記炭酸塩化合物と、前記酸とが分離槽へ同時に供給され
る請求項５の土壌浄化工法。6. The soil purification method according to claim 5, wherein the soil contaminated with the poorly water-soluble organic matter, the carbonate compound, and the acid are simultaneously supplied to the separation tank.
求項１、２のいずれかの土壌浄化工法。7. The soil purification method according to claim 1, wherein the bubbles are composed of air.
する請求項１−７のいずれか１項の土壌浄化工法。8. The soil purification method according to claim 1, wherein the water temperature in the separation tank is higher than a predetermined temperature.
が投入される分離槽と、アルカリ剤を分離槽に供給する
アルカリ剤供給手段と、分離槽に気泡を発生させる気泡
発生手段とを有し、難水溶性有機物を水面上まで浮上せ
しめることを特徴とする土壌浄化装置。9. A separation tank into which soil and water contaminated with a poorly water-soluble organic substance are charged, an alkaline agent supply means for supplying an alkaline agent to the separation tank, and a bubble generation means for generating bubbles in the separation tank. And a soil purification device which is capable of floating a poorly water-soluble organic substance to the surface of the water.
供給する酸化剤供給手段を有し、前記気泡は酸化剤の分
解により発生した酸素ガスで構成されている請求項９の
土壌浄化装置。10. The soil purifying apparatus according to claim 9, wherein the air bubble generating means has an oxidant supply means for supplying an oxidant to the separation tank, and the air bubbles are composed of oxygen gas generated by decomposition of the oxidant. .
り、前記気泡発生手段は分離槽に酸を供給する酸供給手
段を有し、前記気泡は炭酸塩化合物と酸との反応により
発生した炭酸ガスで構成されている請求項９の土壌浄化
装置。11. The alkaline agent is a carbonate compound, the bubble generating means has an acid supply means for supplying an acid to the separation tank, and the bubbles are carbon dioxide gas generated by a reaction between the carbonate compound and the acid. The soil purification device according to claim 9, which is constituted by:
給する空気供給手段を有し、前記気泡は空気で構成され
ている請求項９の土壌浄化装置。12. The soil purifying apparatus according to claim 9, wherein the air bubble generating means has an air supply means for supplying air to the separation tank, and the air bubbles are made of air.
温にする加熱手段を備えた請求項９−１２のいずれか１
項の土壌浄化装置。13. A heating means for raising the temperature of water in the separation tank to a temperature higher than a predetermined temperature.
Soil remediation device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17626496A JP3236219B2 (en) | 1996-03-11 | 1996-07-05 | Soil purification method and equipment |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5280696 | 1996-03-11 | ||
| JP8-52806 | 1996-03-11 | ||
| JP17626496A JP3236219B2 (en) | 1996-03-11 | 1996-07-05 | Soil purification method and equipment |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001255776A Division JP2002113454A (en) | 1996-03-11 | 2001-08-27 | Soil decontamination method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09299924A true JPH09299924A (en) | 1997-11-25 |
| JP3236219B2 JP3236219B2 (en) | 2001-12-10 |
Family
ID=26393470
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17626496A Expired - Fee Related JP3236219B2 (en) | 1996-03-11 | 1996-07-05 | Soil purification method and equipment |
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| Country | Link |
|---|---|
| JP (1) | JP3236219B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001074505A1 (en) * | 2000-03-30 | 2001-10-11 | Patrice Stengel | Method for depollution of soils polluted by hydrocarbons |
| JP2003220382A (en) * | 2002-01-31 | 2003-08-05 | Sumitomo Metal Mining Co Ltd | Apparatus and method for cleaning polluted soil |
| JP2010029808A (en) * | 2008-07-30 | 2010-02-12 | Okumura Corp | Polluted soil purifying method |
| CN103658159A (en) * | 2012-09-13 | 2014-03-26 | 比尔·莱普贝托 | Mobil remediation trailer |
| CN103934265A (en) * | 2014-04-01 | 2014-07-23 | 江苏大学 | Method for restoring soil contaminated by poly-brominated diphenyl ether by combining solubilization of surface active agent and microwave irradiation technology |
| CN108500056A (en) * | 2018-05-30 | 2018-09-07 | 河北工业大学 | A method of repairing petroleum hydrocarbon contaminated soil using in-situ oxidation-synchronization air supporting |
-
1996
- 1996-07-05 JP JP17626496A patent/JP3236219B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001074505A1 (en) * | 2000-03-30 | 2001-10-11 | Patrice Stengel | Method for depollution of soils polluted by hydrocarbons |
| US6872261B2 (en) | 2000-03-30 | 2005-03-29 | Patrice Stengel | Method of depolluting soil polluted by hydrocarbons |
| JP2003220382A (en) * | 2002-01-31 | 2003-08-05 | Sumitomo Metal Mining Co Ltd | Apparatus and method for cleaning polluted soil |
| JP2010029808A (en) * | 2008-07-30 | 2010-02-12 | Okumura Corp | Polluted soil purifying method |
| CN103658159A (en) * | 2012-09-13 | 2014-03-26 | 比尔·莱普贝托 | Mobil remediation trailer |
| CN103934265A (en) * | 2014-04-01 | 2014-07-23 | 江苏大学 | Method for restoring soil contaminated by poly-brominated diphenyl ether by combining solubilization of surface active agent and microwave irradiation technology |
| CN103934265B (en) * | 2014-04-01 | 2016-05-25 | 江苏大学 | A kind of surface active agent solubilization is repaired the method for PBDE contaminated soil in conjunction with Microwave Radiation in Manufacturing |
| CN108500056A (en) * | 2018-05-30 | 2018-09-07 | 河北工业大学 | A method of repairing petroleum hydrocarbon contaminated soil using in-situ oxidation-synchronization air supporting |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3236219B2 (en) | 2001-12-10 |
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