JP2003290760A - Method and apparatus for decontaminating contaminated soil - Google Patents
Method and apparatus for decontaminating contaminated soilInfo
- Publication number
- JP2003290760A JP2003290760A JP2002096987A JP2002096987A JP2003290760A JP 2003290760 A JP2003290760 A JP 2003290760A JP 2002096987 A JP2002096987 A JP 2002096987A JP 2002096987 A JP2002096987 A JP 2002096987A JP 2003290760 A JP2003290760 A JP 2003290760A
- Authority
- JP
- Japan
- Prior art keywords
- soil
- positive
- electrodes
- contaminated soil
- current
- 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.)
- Pending
Links
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は,電極を用いた土壌
浄化方法及び汚染土壌浄化装置に係り、特に重金属等に
より汚染された再開発土地において、短期間に土地の再
利用が可能となる土壌浄化方法及び汚染土壌浄化装置に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil purification method and a contaminated soil purification apparatus using an electrode, and in particular, in a redeveloped land contaminated by heavy metals or the like, the soil can be reused in a short period of time. The present invention relates to a purification method and a contaminated soil purification device.
【0002】[0002]
【従来の技術】図8は、従来特開平9-47748号公報で提
案された土壌浄化方法を説明するための図で、同図
(a)はこの土壌浄化方法の原理を説明するための図、
同図(b)は陽極ならびに陰極の構成を説明するための
図である。2. Description of the Related Art FIG. 8 is a diagram for explaining a soil purification method proposed in Japanese Patent Laid-Open No. 9-47748, and FIG. 8 (a) is a diagram for explaining the principle of this soil purification method. ,
FIG. 3B is a diagram for explaining the configurations of the anode and the cathode.
【0003】この土壌浄化方法は同図(a)に示すよう
に汚染土壌30内に所定の間隔をおいて陽極31と陰極
32を設置し、陽極31と陰極32の間に電気を流し、
電気泳動及び電気浸透の作用により土壌の間隙水ととも
に重金属イオン38を陰極32側に移動させる。In this soil purification method, as shown in FIG. 1A, an anode 31 and a cathode 32 are installed in a contaminated soil 30 at predetermined intervals, and electricity is supplied between the anode 31 and the cathode 32.
Due to the action of electrophoresis and electroosmosis, the heavy metal ions 38 are moved to the cathode 32 side together with the pore water of the soil.
【0004】同図(b)に示すように、陽極31は透孔
33を有する中空管34と酸性溶液を供給する供給管3
6とから構成され、陰極32は透孔33を有する中空管
35と酸性溶液を回収する回収管36とから構成されて
いる。汚染土壌30に塩酸や酢酸等の酸性溶液を供給
し、重金属イオン38を含む酸性溶液を陰極32側に設
置した回収管36を通して回収、除去する。As shown in FIG. 1B, the anode 31 is a hollow pipe 34 having a through hole 33 and a supply pipe 3 for supplying an acidic solution.
6, the cathode 32 is composed of a hollow tube 35 having a through hole 33 and a recovery tube 36 for recovering the acidic solution. An acidic solution such as hydrochloric acid or acetic acid is supplied to the contaminated soil 30, and the acidic solution containing the heavy metal ions 38 is recovered and removed through a recovery pipe 36 installed on the cathode 32 side.
【0005】図9は、特開2000-140819号公報で提案さ
れた土壌浄化方法を説明するための図である。これも同
様に土壌39に陽極45と陰極46を所定の間隔をおい
て設置し、陽極45と陰極46間に電気を流し、電気泳
動および電気浸透作用により土壌39に浸透させた水と
共に重金属イオンを陰極46側に移動させる。そして陰
極46側の陰極電極水48をポンプ40で揚水し、陰極
電極水排出用ピット52を経由して中和槽53に送り、
陰極電極水48から重金属を取除く方法である。FIG. 9 is a diagram for explaining the soil purification method proposed in Japanese Patent Laid-Open No. 2000-140819. Similarly, the anode 45 and the cathode 46 are installed in the soil 39 at a predetermined interval, electricity is passed between the anode 45 and the cathode 46, and heavy metal ions are added together with water that has permeated the soil 39 by electrophoresis and electroosmosis. Are moved to the cathode 46 side. Then, the cathode electrode water 48 on the cathode 46 side is pumped up by the pump 40 and sent to the neutralization tank 53 via the cathode electrode water discharge pit 52,
This is a method of removing heavy metals from the cathode electrode water 48.
【0006】図中の41は土壌収納室、42は陽極電極
設置室、43は陰極電極設置室、44は仕切り板、47
は陽極電極水、49は直流電源、50は陽極電極水ピッ
ト、51は陰極電極水ピット、54は活性炭吸着塔であ
る。In the figure, 41 is a soil storage chamber, 42 is an anode electrode installation chamber, 43 is a cathode electrode installation chamber, 44 is a partition plate, and 47 is a partition plate.
Is an anode electrode water, 49 is a DC power source, 50 is an anode electrode water pit, 51 is a cathode electrode water pit, and 54 is an activated carbon adsorption tower.
【0007】図8ならびに図9に示す両者はいずれも,
重金属によって汚染された土壌から重金属を除去する方
法である。このうち図8に示す方法は、電気を流すこと
によりアルカリ性化した陰極近傍の土壌に酸性溶液を加
えて酸性化する。これにより水酸化物として不溶化した
重金属類は、溶解して土壌中の水分とともに陰極側に移
動し電極水として取り出し、吸着剤を用いて捕集され
る。このため土壌中重金属類の含有量は低減して、含有
量規制にも対応できる。Both shown in FIG. 8 and FIG.
It is a method for removing heavy metals from soil contaminated with heavy metals. Among them, the method shown in FIG. 8 adds acid solution to the soil in the vicinity of the cathode which is alkalized by passing electricity to acidify it. Due to this, the heavy metals insolubilized as hydroxides are dissolved and moved to the cathode side together with the water content in the soil, taken out as electrode water, and collected using an adsorbent. Therefore, the content of heavy metals in the soil is reduced, and it is possible to comply with the content regulation.
【0008】また図9に示す方法は、揚水中に重金属を
溶解させ、土壌中から汚染物質を取り除くため、揚水中
の重金属濃度を測定することにより、土壌中の重金属類
含有量、すなわち汚染度を知ることができる。The method shown in FIG. 9 dissolves heavy metals in pumped water and removes pollutants from the soil. Therefore, the concentration of heavy metals in the pumped water is measured to determine the content of heavy metals in the soil, that is, the degree of contamination. You can know.
【0009】両者とも,電気をかけながら酸性溶液を供
給するので陰極側では常に水酸基(OH- )が生成する
ため、酸性溶液を供給して陰極近傍を酸性にしなければ
ならない。In both cases, since an acidic solution is supplied while electricity is applied, hydroxyl groups (OH − ) are always generated on the cathode side, and therefore the acidic solution must be supplied to make the vicinity of the cathode acidic.
【0010】以上の電気を流して汚染された土壌から該
汚染物質を除去する従来の方法は、重金属類等の電気泳
動現象を利用することから、印加する電流は直流であ
り、通常、定電圧での運転となっている。The conventional method for removing the pollutants from the contaminated soil by applying the above-mentioned electricity utilizes the electrophoretic phenomenon of heavy metals and the like, so that the applied current is direct current, and usually a constant voltage is applied. It is driving in.
【0011】図10は、特開平8-281247号公報で提案さ
れた土壌浄化方法を示す図であり、交流電源62から整
流器64を用いて直流にして通電する方法が示されてい
る。図中の55は電気化学的処理槽、56は土壌、57
は陽極、58は陰極、59は給液室、60は収液室、6
1は送液槽、63はトランス、65はバルブ、66は送
入パイプ、67は電解槽、68は陽極、69は陰極、7
0は貯液槽、71は循環パイプ、72はポンプ、73,
74は小孔である。FIG. 10 is a diagram showing a soil cleaning method proposed in Japanese Patent Application Laid-Open No. 8-281247, which shows a method of energizing by making a direct current from an AC power source 62 using a rectifier 64. In the figure, 55 is an electrochemical treatment tank, 56 is soil, and 57.
Is an anode, 58 is a cathode, 59 is a liquid supply chamber, 60 is a liquid collection chamber, 6
1 is a liquid sending tank, 63 is a transformer, 65 is a valve, 66 is an inlet pipe, 67 is an electrolytic tank, 68 is an anode, 69 is a cathode, 7
0 is a liquid storage tank, 71 is a circulation pipe, 72 is a pump, 73,
74 is a small hole.
【0012】図11は、特開平10-85718号公報で提案さ
れた土壌浄化方法を示す図であり、この場合は半波整流
電源76を電極77,78に接続している。79,80
はイオン交換繊維である。FIG. 11 is a diagram showing a soil cleaning method proposed in Japanese Patent Laid-Open No. 10-85718. In this case, a half-wave rectifying power source 76 is connected to electrodes 77 and 78. 79, 80
Is an ion exchange fiber.
【0013】[0013]
【発明が解決しようとする課題】重金属によって汚染さ
れた土壌から重金属を除去する前記従来技術は、下記の
ような問題点を有している。The conventional technique for removing heavy metals from soil contaminated with heavy metals has the following problems.
【0014】すなわち従来の方法は、重金属類等の電気
泳動現象を利用することから、印加する電流は主に直流
電流であり、その場合は通常、定電圧での運転となって
いる。この定電圧運転の場合、一応、1V/cm程度の
印加電圧を使用することが目安になっている。すなわち
従来の定電圧印加法では、重金属類の電気泳動のし易さ
=重金属除去率と、ユーティリティコストの兼ね合い
で、前記の1V/cm程度印加させる例が多い。That is, since the conventional method utilizes the electrophoretic phenomenon of heavy metals and the like, the applied current is mainly a direct current, and in that case, the operation is usually performed at a constant voltage. In the case of this constant voltage operation, it is a standard to use an applied voltage of about 1 V / cm. That is, in the conventional constant voltage application method, there are many examples in which about 1 V / cm is applied in consideration of the ease of electrophoresis of heavy metals = the heavy metal removal rate and the utility cost.
【0015】また、現地に汚染土壌浄化装置を設置し
て、その場で大量の土壌を浄化する場合には、土地面積
に応じて、1V/cmとなるように電極を多数設置し、
印加電圧を決定する必要がある。Further, when a contaminated soil purifying device is installed on the site to purify a large amount of soil on the spot, a large number of electrodes are installed so as to be 1 V / cm depending on the land area,
It is necessary to determine the applied voltage.
【0016】従来の直流を用いた定電圧運転では、例え
ば土壌汚染で問題視されているCdやPbなどの重金属
は陽イオン化し、印加電流により陰極に引き寄せる力を
受ける。そのため電気泳動効果で一部の重金属類は陰極
の電極周辺まで到達する。しかし、土壌中には雑多の異
物(植物、鉱物結晶等)が多く含まれるため、これらの
異物で構成されるマトリックスが一種の分子ふるい効果
を有しており、土壌に電圧一定の直流電流をかけても電
気泳動の速度が遅い上に、これらの土壌中の異物からの
脱着過程が律速となり、一定の除去率に到達するために
は膨大な時間を要する。In the conventional constant voltage operation using direct current, heavy metals such as Cd and Pb, which are problematic in soil pollution, are positively ionized and are subjected to a force attracted to the cathode by an applied current. Therefore, due to the electrophoretic effect, some heavy metals reach the periphery of the cathode electrode. However, since many foreign substances (plants, mineral crystals, etc.) are contained in the soil, the matrix composed of these foreign substances has a kind of molecular sieving effect, and direct current with a constant voltage is applied to the soil. Even when applied, the speed of electrophoresis is slow and the desorption process from these foreign substances in the soil becomes rate-determining, and it takes a huge amount of time to reach a certain removal rate.
【0017】また、直流では電圧一定値で印加されるた
め、電極近傍で水の電気分解反応が随時進行し、陽極部
での強酸性化による電極の溶損、陰極部での強アルカリ
化による重金属類の不溶化・沈殿という問題点が生じ
る。また、印加した電気エネルギーは、前記水の電気分
解反応、および土壌の電気抵抗に起因するジュール熱の
発生に使われてしまい、電気泳動への寄与分が低下する
ため、無駄が多い。In addition, since a constant voltage is applied to the direct current, the electrolysis reaction of water progresses in the vicinity of the electrode at any time, resulting in the dissolution of the electrode due to strong acidification at the anode part and the strong alkalinity at the cathode part. The problem of insolubilization and precipitation of heavy metals occurs. Moreover, the applied electric energy is used for the electrolysis reaction of the water and the generation of Joule heat due to the electric resistance of the soil, and the contribution to the electrophoresis is reduced, so that it is wasteful.
【0018】そこで、前記特開平8-281247号公報や特開
平10-85718号公報に記述されているように半波整流した
ものを用いる方法(図11参照)が考えられている。Therefore, a method (see FIG. 11) of using a half-wave rectified device as described in JP-A-8-281247 and JP-A-10-85718 has been considered.
【0019】しかし、交流電源+整流器という組み合わ
せでは、電圧は0V〜一定値まで変位するが、両電極の
極性を変換するわけではないので、電極近傍での水の電
気分解反応は進行してしまい、陽極部での強酸性化によ
る電極の溶損、陰極部での強アルカリ化による重金属類
の不溶化・沈殿という問題点が残る。また、印加した電
気エネルギーが、水の電気分解反応および土壌の電気抵
抗に起因するジュール熱の発生に使われ、電気泳動への
寄与分が低下するため無駄が多い。However, in the combination of the AC power supply and the rectifier, the voltage is displaced from 0 V to a constant value, but the polarities of both electrodes are not converted, and therefore the electrolysis reaction of water proceeds near the electrodes. However, there remains a problem that the electrode is melted by strong acidification at the anode part and the heavy metal is insolubilized / precipitated by strong alkalinization at the cathode part. Further, the applied electric energy is used for the electrolysis reaction of water and the generation of Joule heat due to the electric resistance of the soil, and the contribution to the electrophoresis is reduced, which is wasteful.
【0020】また、直流電源、交流電源+整流器を用い
た場合、陰極近傍の土壌がアルカリ性化し、このアルカ
リ成分、および不溶化重金属が電気抵抗となり、陰極近
傍で特に電位差が大きくなる。このためさらに土壌の電
気抵抗が増え、ジュール熱の発生を増加させる要因とな
る。When a DC power source, an AC power source and a rectifier are used, the soil in the vicinity of the cathode becomes alkaline, the alkali component and the insolubilized heavy metal become electric resistance, and the potential difference becomes particularly large near the cathode. Therefore, the electric resistance of the soil further increases, which becomes a factor to increase the generation of Joule heat.
【0021】もちろん、印加する電圧を増加すれば電気
泳動効果は増えるが、
.電圧を増加した分、土壌の電気抵抗に起因するジュ
ール熱を余分に発生させることになり、土壌に添加した
鉱酸、鉱酸水溶液、水、および地下水など土壌に含まれ
る水分が蒸発し、その中に溶解している重金属類を系外
に揮散する可能性がある。また、印加した電気エネルギ
ーを増やした分、熱エネルギーとなって系外に出る割合
も増え、無駄が増大する。Of course, if the applied voltage is increased, the electrophoretic effect is increased. As the voltage is increased, extra Joule heat due to the electric resistance of the soil will be generated, and the mineral acid added to the soil, the aqueous solution of mineral acid, water, and water contained in the soil such as groundwater will evaporate. There is a possibility that the heavy metals dissolved in it may be volatilized out of the system. In addition, as the applied electric energy is increased, the rate at which it becomes thermal energy and goes out of the system also increases, and waste increases.
【0022】.さらに電極近傍での電極水の電気分解
反応、および電極と電極水間の反応がさらに進行し、反
応熱の増加による電極水の蒸発を招き、溶解している重
金属類を系外に揮散させる可能性がある。また、印加し
た電気エネルギーが分解反応のために無駄に消費され
る。.. Furthermore, the electrolysis reaction of the electrode water near the electrodes and the reaction between the electrodes and the electrode water further proceed, causing the evaporation of the electrode water due to the increase in the reaction heat, and the dissolved heavy metals can be volatilized out of the system. There is a nature. Further, the applied electric energy is wasted due to the decomposition reaction.
【0023】.また、電極水の電気分解反応により電
極近傍において電極水のpH値が急激に変化し、電極の
溶損を生じる点で問題となる。すなわち、陽極はpH低
下(強酸性化)、陰極はpH上昇(強アルカリ化)する
ため、陽極の溶損を生じ、陰極近傍の強アルカリ化によ
り、電気泳動してきた重金属類が陰極近傍の土壌中で水
酸化物を生成し、不溶化、沈殿するという問題がさらに
顕著になる。.. In addition, the pH value of the electrode water rapidly changes in the vicinity of the electrode due to the electrolysis reaction of the electrode water, which causes a problem in that the electrode is melted and damaged. That is, the pH of the anode decreases (strongly acidifies) and the pH of the cathode rises (strongly alkalises), causing erosion of the anode, and strong alkalinity near the cathode causes heavy metals that have electrophoresed to soil near the cathode. The problem of forming hydroxide, insolubilizing and precipitating in the solution becomes more remarkable.
【0024】陽極の溶損を最小限にするために、耐酸性
の強い貴金属、例えば白金等を電極として用いることも
考えられるが、当然、コストアップ要因となる。その
上、現地作業において高価な電極を用いるのは、現地で
の入手のし難さ、高価備品管理などの管理コストの増加
原因となり得るため、望ましくない。In order to minimize the erosion loss of the anode, it is conceivable to use a noble metal having strong acid resistance, such as platinum, as an electrode, but this naturally causes a cost increase. In addition, it is not desirable to use an expensive electrode in the field work because it is difficult to obtain locally and the management cost such as expensive equipment management increases.
【0025】また、従来方法では50〜60Hzの周波
数のものが使用されており、この周波数と重金属除去率
との関係については何も考慮されていない。In the conventional method, a frequency of 50 to 60 Hz is used, and no consideration is given to the relationship between this frequency and the heavy metal removal rate.
【0026】本発明の目的は、前述した従来技術の欠点
を解消し、電極の溶損を抑え、電気エネルギーを有効利
用して重金属類を低コストで汚染土壌などから除去する
汚染土壌浄化方法及び汚染土壌浄化装置を提供すること
である。An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, suppress the electrode melting loss, and effectively utilize electric energy to remove heavy metals from contaminated soil and the like at low cost, and An object is to provide a contaminated soil purification device.
【0027】[0027]
【課題を解決するための手段】前記目的を達成するた
め、本発明の第1の手段は、例えば鉱酸、鉱酸水溶液ま
たは水などを添加して湿潤した汚染土壌内に所定の間隔
をおいて電極を設置し,両電極間に電流を流して、土壌
中の例えば重金属などの汚染物質を取り除く汚染土壌浄
化方法において、前記電流の波形が矩形波,正弦波,パ
ルス波,鋸波または三角波であって、その印加電流の電
圧が正領域と負領域で時間と共に推移して、電圧が正の
期間の電流積分値と負の期間の電流積分値が等しいか、
またはこの積分値の差(正−負)が正値であることを特
徴とするものである。In order to achieve the above object, the first means of the present invention provides a predetermined interval in a contaminated soil moistened by adding, for example, mineral acid, an aqueous solution of mineral acid or water. In the method for cleaning polluted soil to remove pollutants such as heavy metals in the soil by installing electrodes between the electrodes and applying a current between the electrodes, the waveform of the current is rectangular wave, sine wave, pulse wave, sawtooth wave or triangular wave. The voltage of the applied current changes with time in the positive region and the negative region, and the current integral value in the positive period and the current integral value in the negative period are equal to each other,
Alternatively, the difference (positive-negative) in the integrated value is a positive value.
【0028】本発明の第2の手段は、湿潤した汚染土壌
内に所定の間隔をおいて電極を設置し,両電極間に電流
を流して、土壌中の汚染物質を取り除く汚染土壌浄化方
法において、前記印加電流の波形が波形発生器を通じて
得られる、電圧が正領域と負領域で時間と共に推移する
ものであって、電圧が正の期間の電流積分値と負の期間
の電流積分値が等しいか,またはこの積分値の差(正−
負)が正値であることを特徴とするものである。The second means of the present invention is a method for purifying contaminated soil, in which electrodes are installed in moist contaminated soil at predetermined intervals and an electric current is passed between both electrodes to remove pollutants in the soil. The waveform of the applied current is obtained through a waveform generator, the voltage changes with time in a positive region and a negative region, and the current integral value in the positive period and the current integral value in the negative period are equal. Or the difference between these integrated values (positive −
Negative) is a positive value.
【0029】本発明の第3の手段は、湿潤した汚染土壌
内に所定の間隔をおいて電極を設置し,両電極間に電流
を流して、土壌中の汚染物質を取り除く汚染土壌浄化方
法において、時刻tにおいてV(t)で示される印加電流
の電圧が正領域と負領域で時間と共に推移して、電圧V
(t)が正値である期間をt1,負値である期間をt2と
した場合、電圧の絶対値|V(t)|に関して、The third means of the present invention is a method for purifying a contaminated soil, wherein electrodes are installed in moist contaminated soil at predetermined intervals, and an electric current is passed between both electrodes to remove pollutants in the soil. , The voltage of the applied current represented by V (t) at time t changes with time in the positive region and the negative region, and the voltage V
When the period when (t) is a positive value is t1 and the period when it is a negative value is t2, the absolute value of voltage | V (t) |
【数1】 の関係が成立することを特徴とするものである。[Equation 1] It is characterized in that the relationship of is established.
【0030】本発明の第4の手段は、湿潤した汚染土壌
内に所定の間隔をおいて電極を設置し,両電極間に電流
を流して、土壌中の汚染物質を取り除く汚染土壌浄化方
法において、前記印加電流の電圧が、一定電圧(+V
1:正値)と、一定電圧(−V2:負値)間で推移し、正
値(+V1)である期間(t1)と負値(−V2)である期間
(t2)との間に、
(V1×t1) ≧ (V2×t2)
の関係が成立することを特徴とするものである。The fourth means of the present invention is a method for purifying contaminated soil, in which electrodes are installed in moist contaminated soil at predetermined intervals and an electric current is passed between both electrodes to remove pollutants in the soil. , The voltage of the applied current is a constant voltage (+ V
1: Positive value) and a constant voltage (-V2: negative value), and is a positive value (+ V1) period (t1) and a negative value (-V2) period.
It is characterized in that a relationship of (V1 × t1) ≧ (V2 × t2) is established between (t2).
【0031】本発明の第5の手段は、湿潤した汚染土壌
内に所定の間隔をおいて電極を設置し,両電極間に電流
を流して、土壌中の汚染物質を取り除く汚染土壌浄化方
法において、前記印加電流の電圧が,±V1(V1:正
値)間で推移し、かつ、+V1である期間(t1)と−V
1である期間(t2)との間に,t1≧t2の関係が成立
することを特徴とするものである。The fifth means of the present invention is a method for purifying contaminated soil, in which electrodes are installed in moist contaminated soil at predetermined intervals and an electric current is passed between both electrodes to remove pollutants in the soil. , The voltage of the applied current changes between ± V1 (V1: positive value) and is + V1 (t1) and −V.
It is characterized in that the relationship of t1 ≧ t2 is established with the period (t2) which is 1.
【0032】本発明の第6の手段は、湿潤した汚染土壌
内に所定の間隔をおいて電極を設置し,両電極間に電流
を流して、土壌中の汚染物質を取り除く汚染土壌浄化方
法において、前記印加電流の波形が、交流波形の0V以
下の領域の一部をカットした波形をなすことを特徴とす
るものである。A sixth means of the present invention is a method for purifying a contaminated soil, in which electrodes are installed in moist contaminated soil at a predetermined interval and an electric current is applied between both electrodes to remove pollutants in the soil. The waveform of the applied current is a waveform obtained by cutting a part of a region of 0 V or less of the AC waveform.
【0033】本発明の第7の手段は前記第1の手段ない
し第6の手段において、前記電流の周波数が0.01H
z〜1000kHzの範囲内にあることを特徴とするも
のである。A seventh means of the present invention is the first to sixth means, wherein the frequency of the current is 0.01H.
It is characterized by being in the range of z to 1000 kHz.
【0034】本発明の第8の手段は前記第7の手段にお
いて、前記電流の周波数が50Hz〜10kHzの範囲
内にあることを特徴とするものである。The eighth means of the present invention is characterized in that, in the seventh means, the frequency of the current is in the range of 50 Hz to 10 kHz.
【0035】本発明の第9の手段は、湿潤した汚染土壌
内に所定の間隔をおいて設置される複数の電極と、その
電極に印加する電流の電圧が正領域と負領域で時間と共
に推移し、電圧が正の期間の電流積分値と負の期間の電
流積分値が等しいか、またはこの積分値の差(正−負)が
正値であるような電流を印加するための電源装置とを備
えることを特徴とするものである。The ninth means of the present invention is to provide a plurality of electrodes installed at a predetermined interval in wet contaminated soil, and the voltage of the current applied to the electrodes changes with time in positive and negative regions. A power supply device for applying a current such that the current integral value in the positive period and the current integral value in the negative period are equal to each other, or the difference (positive-negative) in the integral value is a positive value. It is characterized by including.
【0036】本発明の第10の手段は、湿潤した汚染土
壌内に所定の間隔をおいて設置される複数の電極と、そ
の電極に印加する電流の波形が、交流波形の0V以下の
領域の一部をカットした波形をなす電源装置とを備える
ことを特徴とするものである。According to a tenth means of the present invention, a plurality of electrodes installed at a predetermined interval in wet contaminated soil and a waveform of a current applied to the electrodes are in an area of 0 V or less of an AC waveform. And a power supply device having a waveform with a part cut off.
【0037】[0037]
【発明の実施形態】前述のように従来の方法では、陽極
電極の溶損、陰極部でのアルカリ化という問題点を有し
ている。本発明者らは、前述のように印加する電流を、
単純な定電圧の直流電源または交流電源を半波整流した
直流の代わりに、印加電流を任意周波数に制御し、正負
両範囲を含めた正弦波、パルス波、矩形波、鋸波、三角
波などとし、正の期間の電流の積分値と負の期間の電流
の積分値の差(正−負)が0または正値となるように制
御することで解決した。BEST MODE FOR CARRYING OUT THE INVENTION As described above, the conventional method has problems that the anode electrode is melted and the cathode portion is alkalinized. The present inventors have applied the current applied as described above to
Instead of a direct current obtained by rectifying a half-wave rectification of a simple constant voltage DC power supply or AC power supply, the applied current is controlled to an arbitrary frequency, and a sine wave, a pulse wave, a rectangular wave, a sawtooth wave, a triangular wave including both the positive and negative ranges are generated. It was solved by controlling the difference (positive-negative) between the integrated value of the current in the positive period and the integrated value of the current in the negative period to be 0 or a positive value.
【0038】汚染土壌中の重金属類は、溶液中で大部分
は陽イオン化するので、陽イオンとして取り扱うことが
できる。そこで、従来は直流電流を流し、陰極に移動し
た重金属イオンを溶液の状態で回収したり、吸着剤を用
いて吸着させるなどの手段を用いて回収していた。しか
し、前述したように、土壌中のマトリックスが一種の分
子ふるい作用を持っているかのように振舞うため、通常
電気泳動の速度は非常に遅く、一定の除去率に到達する
ためには膨大な時間を要する。The heavy metals in the contaminated soil can be treated as cations because most of them are cationized in the solution. Therefore, in the past, a direct current was made to flow, and the heavy metal ions that had moved to the cathode were collected in a solution state or were adsorbed using an adsorbent. However, as mentioned above, since the matrix in soil behaves as if it has a kind of molecular sieving action, the speed of electrophoresis is usually very slow, and it takes a huge amount of time to reach a certain removal rate. Requires.
【0039】前述の半波整流電源などを用いる方法にお
いても、電圧の変化は0V〜一定電圧であり、電極近傍
で水(または電極水)の電気分解反応が進行してしま
い、陽極部での強酸性化による電極の溶損、陰極部での
アルカリ化による重金属類の不溶化・沈殿という問題点
が生じる。Even in the method using a half-wave rectified power source as described above, the voltage change is 0 V to a constant voltage, and the electrolysis reaction of water (or electrode water) proceeds in the vicinity of the electrodes, so that the anode part This causes problems such as electrode melting due to strong acidification and insolubilization / precipitation of heavy metals due to alkalinization at the cathode part.
【0040】また、水(または電極水)の電気分解反応
が進行すると、印加した電気エネルギーが無駄に消費さ
れるばかりでなく、陰極近傍の土壌がアルカリ化し、こ
のアルカリ成分および不溶化重金属が電気抵抗となり、
陰極近傍で特に電位差が大きくなる。このため、さらに
土壌の電気抵抗が増え、ジュール熱の発生を増加させる
要因となる。Further, when the electrolysis reaction of water (or electrode water) proceeds, not only the applied electric energy is wastefully consumed, but also the soil in the vicinity of the cathode becomes alkaline, and the alkali component and the insolubilized heavy metal have an electric resistance. Next to
The potential difference becomes particularly large near the cathode. Therefore, the electric resistance of the soil further increases, which becomes a factor to increase the generation of Joule heat.
【0041】本発明では、電圧波形が正、負に渡る正弦
波、パルス波、矩形波、鋸波または三角波を用いること
で、従来技術よりも電極寿命を向上させ、かつ印加した
電気エネルギーを有効に利用することができることを見
出し、土壌中の重金属類を低コストで除去することがで
きる。In the present invention, by using a sine wave, a pulse wave, a rectangular wave, a sawtooth wave, or a triangular wave whose voltage waveform is positive or negative, the electrode life is improved and the applied electrical energy is effective as compared with the prior art. It is possible to remove heavy metals in soil at low cost.
【0042】この正弦波、パルス波、矩形波、鋸波また
は三角波を用いるのは以下の理由による。正、負にわた
る正弦波、パルス波、矩形波、鋸波、三角波を用いる
と、ある周波数でもって正負の両方向に電圧が切り替わ
る=電極の極性が切り替わるため、電極近傍では、水の
電気分解反応が進行する前に極性が切り替わることにな
る。The sine wave, pulse wave, rectangular wave, sawtooth wave or triangular wave is used for the following reason. When positive and negative sine waves, pulse waves, rectangular waves, sawtooth waves, and triangular waves are used, the voltage switches in both positive and negative directions at a certain frequency = the polarity of the electrodes switches, so the electrolysis reaction of water near the electrodes The polarity will change before proceeding.
【0043】このとき、陽極部では水の電気分解に起因
する水素イオンの発生が抑えられて、強酸性化は起こら
ず、電極の溶損が抑えられる。従って、高価な貴金属を
用いる必要がなく、コストを削減できる。At this time, generation of hydrogen ions resulting from electrolysis of water is suppressed at the anode portion, strong acidification does not occur, and melting damage of the electrode is suppressed. Therefore, it is not necessary to use an expensive precious metal, and the cost can be reduced.
【0044】一方、陰極部では、水の電気分解に起因す
る水酸化物イオンの発生が抑えられて、強アルカリ化は
起こらない。従って、土壌を適正なpHにコントロール
するために添加する鉱酸濃度を従来法よりも低くする、
または鉱酸の添加を不要とすることが可能となり、コス
トを削減できる。さらに、陰極近傍の土壌内で重金属類
が不溶化・沈殿するという問題が生じないため、効率的
に重金属類の除去が可能となる。On the other hand, in the cathode portion, generation of hydroxide ions due to electrolysis of water is suppressed, and strong alkalinity does not occur. Therefore, the concentration of mineral acid added to control the soil to a proper pH should be lower than in the conventional method.
Alternatively, it becomes possible to eliminate the need for adding a mineral acid, and the cost can be reduced. Furthermore, since the problem of insolubilization and precipitation of heavy metals in the soil near the cathode does not occur, it is possible to efficiently remove heavy metals.
【0045】さらにまた、陰極付近の土壌が強アルカリ
化しないことから、陰極近傍の土壌で電気抵抗が増える
要因が無くなるため、特に陰極近傍での電位差を増加さ
せることがなく、ジュール熱の発生を抑える効果が得ら
れる。Furthermore, since the soil in the vicinity of the cathode does not become a strong alkali, there is no factor for increasing the electric resistance in the soil in the vicinity of the cathode, so that the potential difference in the vicinity of the cathode is not increased and Joule heat is generated. The effect of suppressing is obtained.
【0046】本発明による、正、負に渡る正弦波、パル
ス波、矩形波、鋸波、三角波を用いると、印加した電気
エネルギーは、水の電気分解反応に使われることはな
く、また、土壌の電気抵抗に起因するジュール熱の発生
等に使われる割合が非常に少ない。電気エネルギーの大
部分は重金属類の電気泳動に使用されるため、無駄が非
常に少なく、効率よく重金属類を電気泳動できる。When a positive or negative sine wave, a pulse wave, a rectangular wave, a sawtooth wave, or a triangular wave according to the present invention is used, the applied electric energy is not used for the electrolysis reaction of water, and the soil is not used. It is very rarely used for the generation of Joule heat due to the electric resistance of. Since most of the electric energy is used for electrophoresis of heavy metals, it is possible to perform efficient electrophoresis of heavy metals with very little waste.
【0047】また、比較的低い電圧値にした場合でも、
従来方法より、重金属の電気泳動効果を効率的に高める
ことができ、さらにジュール熱による電極水の蒸発、重
金属類の系外への飛散を抑えることができる。逆に、電
圧値を高くしても、ジュール熱の発生は従来方法よりも
抑えられるため、問題なく重金属類の除去効率を高める
ことができる。Further, even when the voltage value is relatively low,
As compared with the conventional method, the electrophoretic effect of heavy metals can be efficiently enhanced, and further, evaporation of electrode water due to Joule heat and scattering of heavy metals out of the system can be suppressed. On the contrary, even if the voltage value is increased, the generation of Joule heat is suppressed as compared with the conventional method, so that the removal efficiency of heavy metals can be increased without any problem.
【0048】交流電源を用いたり、正と負が対称なパル
ス波形を用いたりした場合は、同様に電極の溶損は起き
ないが、電気泳動効果による重金属イオンの移動が起こ
らないため、土壌中の重金属を除去するには、浸漬した
溶液(鉱酸、鉱酸水溶液または水)を順次置換させるし
かなく、作業効率の面で望ましくはない。When an AC power source is used or a pulse waveform with positive and negative symmetry is used, the electrode is not melted but the migration of heavy metal ions due to the electrophoretic effect does not occur. In order to remove the heavy metal, the immersion solution (mineral acid, mineral acid aqueous solution or water) must be replaced in sequence, which is not desirable in terms of work efficiency.
【0049】電気泳動を推進させるためには、印加電流
の正の期間に流れる電流の積分値が、負の期間に流れる
電流の積分値と比べて大きくなるように制御し、一方向
に重金属イオンを移動させるようにする。当然、正の期
間の電流の積分値と負の期間の積分値の差(正−負)が
大きいほど、電気泳動速度は速くなる。In order to promote electrophoresis, the integrated value of the current flowing in the positive period of the applied current is controlled so as to be larger than the integrated value of the current flowing in the negative period, and the heavy metal ions are unidirectionally moved. To move. Naturally, the larger the difference (positive-negative) between the integrated value of the current in the positive period and the integrated value of the negative period, the faster the electrophoretic velocity.
【0050】もちろん、印加電流の正の期間に流れる電
流の積分値が、負の期間に流れる電流の積分値と比べて
大きくなるようにすればよいので、該正弦波、パルス
波、矩形波、鋸波、三角波のピーク電圧値や、パルス
幅、或いはパルス数を制御するなど様々な方法が考えら
れ、波形についても様々なものが利用でき、他の実現可
能な方法を使っても構わない。Of course, since the integrated value of the current flowing in the positive period of the applied current may be made larger than the integrated value of the current flowing in the negative period, the sine wave, pulse wave, rectangular wave, Various methods are conceivable, such as controlling the peak voltage value of a sawtooth wave or a triangular wave, the pulse width, or the number of pulses. Various waveforms can be used, and other feasible methods may be used.
【0051】該正弦波、パルス波、矩形波、鋸波、三角
波の周波数は、様々な値を取り得るが、電極部での水の
電気分解反応の抑制効果、および周囲への電波障害の影
響を考慮すると、0.01Hzから1000kHz程度
の間で使用するのが望ましく、特に50Hz〜100k
Hzの範囲、さらに1kHz〜50kHzの範囲で使用
するのが望ましい。The frequencies of the sine wave, the pulse wave, the rectangular wave, the sawtooth wave, and the triangular wave can take various values, but the effect of suppressing the electrolysis reaction of water at the electrode portion and the influence of radio wave interference to the surroundings. Considering the above, it is desirable to use in the range of 0.01 Hz to 1000 kHz, especially 50 Hz to 100 kHz.
It is desirable to use in the range of Hz, and further in the range of 1 kHz to 50 kHz.
【0052】以上まとめると、本発明による作用効果は
以下の通りとなる。
.電極近傍での電極水の電気分解反応は、極性の変換
が起こることにより、抑えられる。従って、印加した電
気エネルギーは電極水の電気分解反応に使われず有効利
用できる。In summary, the effects of the present invention are as follows. . The electrolysis reaction of the electrode water near the electrodes is suppressed by the conversion of the polarity. Therefore, the applied electric energy can be effectively used without being used in the electrolysis reaction of the electrode water.
【0053】.電極水のpHの急激な変化がなく、電
極の溶損を抑え、電極寿命を延ばすことが可能となる。
また、安価な電極を用いることができる。.. There is no sudden change in the pH of the electrode water, and it is possible to suppress the melting loss of the electrode and extend the life of the electrode.
Moreover, an inexpensive electrode can be used.
【0054】.特に陰極土壌の強アルカリ化を抑えら
れるので、陰極近傍での土壌の電気抵抗を増加させる要
因がなくなり、ジュール熱の発生を抑えられる。.. In particular, since strong alkalinity of the cathode soil can be suppressed, there is no factor that increases the electric resistance of the soil near the cathode, and generation of Joule heat can be suppressed.
【0055】.比較的低い電圧値でも重金属の電気泳
動効果を効率的に高めることができ、ジュール熱による
電極水の蒸発、重金属類の系外への飛散を抑えることが
できる。.. The electrophoretic effect of heavy metals can be efficiently enhanced even with a relatively low voltage value, and the evaporation of electrode water due to Joule heat and the scattering of heavy metals out of the system can be suppressed.
【0056】以下、本発明の実施形態について図ととも
に説明する。図1は、第1の実施形態に基づく汚染土壌
の浄化方法を説明するための図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining a method for purifying contaminated soil based on the first embodiment.
【0057】耐酸性処理を施した土壌処理槽1に、重金
属汚染した処理土壌1を入れ、鉱酸、鉱酸水溶液または
水などを添加してほぼ弱酸性〜中性状態にして浸す。土
壌処理槽1の両側に、陽極電極設置室2と陰極電極設置
室3が隣接し、フィルタ6により処理土壌11が両電極
設置室2、3内に進入しないように分離している。処理
土壌11からは陽極電極水7と陰極電極水8のみがフィ
ルタ6を通過できるようになっている。The treated soil 1 contaminated with heavy metals is placed in the soil treatment tank 1 which has been subjected to the acid resistance treatment, and mineral acid, an aqueous solution of mineral acid, water or the like is added to make the soil weakly acidic to neutral. An anode electrode installation chamber 2 and a cathode electrode installation chamber 3 are adjacent to each other on both sides of the soil treatment tank 1, and a treated soil 11 is separated by a filter 6 so as not to enter the both electrode installation chambers 2, 3. Only the anode electrode water 7 and the cathode electrode water 8 can pass through the filter 6 from the treated soil 11.
【0058】陽極電極水供給ポンプ9を用いて陽極配管
10から陽極電極水7を供給する一方で、陰極配管12
から陰極電極水排出ポンプ13を用いて陰極電極水8を
排出して、処理土壌11内に矢印で示すような溶液の流
れを発生させる。Anode electrode water supply pump 9 is used to supply anode electrode water 7 from anode pipe 10, while cathode pipe 12 is used.
The cathode electrode water discharge pump 13 is used to discharge the cathode electrode water 8 to generate a solution flow in the treated soil 11 as indicated by an arrow.
【0059】陽極電極設置室2と陰極電極設置室3に
は、それぞれ例えば鉄系の陽極電極4と陰極電極5を設
置する。両電極4、5は電気配線17で電源装置16に
接続されている。図中の14は酸供給ポンプ、15は酸
供給配管である。An iron-based anode electrode 4 and a cathode electrode 5, for example, are installed in the anode electrode installation chamber 2 and the cathode electrode installation chamber 3, respectively. Both electrodes 4, 5 are connected to the power supply device 16 by an electric wiring 17. In the figure, 14 is an acid supply pump, and 15 is an acid supply pipe.
【0060】前記電源装置16は図示していないが電源
と波形発生器を有し、両電極4、5間に正弦波、パルス
波、矩形波、鋸波、三角波等の電流を流す。このとき基
準となる電源波形は任意であり、図2に示すように正弦
波、パルス波、矩形波、鋸波、三角波等のいずれにおい
ても目的を達成することができる。図2の網点部が印加
する電圧値である。また、一定あるいは不定期間をもっ
て、直流と正弦波、パルス波、矩形波、鋸波または三角
波等を交互に与えるという方法もある。Although not shown, the power supply unit 16 has a power supply and a waveform generator, and supplies a current such as a sine wave, a pulse wave, a rectangular wave, a sawtooth wave, or a triangular wave between the electrodes 4 and 5. At this time, the reference power supply waveform is arbitrary, and as shown in FIG. 2, any of a sine wave, a pulse wave, a rectangular wave, a sawtooth wave, a triangular wave, and the like can achieve the purpose. It is the voltage value applied by the halftone dot portion in FIG. There is also a method in which a direct current and a sine wave, a pulse wave, a rectangular wave, a sawtooth wave, a triangular wave, or the like are alternately applied with a constant or indefinite period.
【0061】この正弦波、パルス波、矩形波、鋸波また
は三角波等は、正と負のサイクルの電流積分値が(正≧
負)となるように制御する。すなわち、時刻tにおいて
電圧V(t)で示され、電圧V( t)が正値である期間をt
1、負値である期間をt2とした場合、電圧の絶対値|
V(t)|に関して、次の式(1)の関係を持つようにす
ればよい。The sine wave, the pulse wave, the rectangular wave, the sawtooth wave, the triangular wave, and the like have current integration values of positive and negative cycles (positive ≧
Control to be negative). That is, at time t, the period indicated by the voltage V (t) and having a positive voltage V (t) is t
1 and absolute value of voltage |
Regarding V (t) |, it suffices to have the relationship of the following expression (1).
【0062】[0062]
【数1】
正と負のサイクルの積分値は、ピーク電圧値や、パルス
幅、或いはパルス数を制御することによってコントロー
ルできる。ただし、正と負のサイクルの積分値を制御す
ればよいので、他の実現可能な方法を使っても構わな
い。[Equation 1] The integrated value of the positive and negative cycles can be controlled by controlling the peak voltage value, the pulse width, or the pulse number. However, since it suffices to control the integral values of the positive and negative cycles, another feasible method may be used.
【0063】また印加電流の電圧が一定電圧(+V1:
正値)と、一定電圧(−V2:負値)間で推移し、正値(+
V1)である期間(t1)と負値(−V2)である期間(t
2)との間に、(V1×t1) ≧ (V2×t2)の関係が
成立するように調整されている。The voltage of the applied current is a constant voltage (+ V1:
Positive value) and a constant voltage (-V2: negative value).
V1) is a period (t1) and a negative value (-V2) is a period (t).
It is adjusted so that the relationship of (V1 × t1) ≧ (V2 × t2) is established between the second and the second.
【0064】さらに印加電流の電圧が,±V1(V1:
正値)間で推移し、かつ、+V1である期間(t1)と−
V1である期間(t2)との間に、t1≧t2の関係が成
立するように調整されている。Further, the voltage of the applied current is ± V1 (V1:
Positive value) and is + V1 for a period (t1) and −
It is adjusted so that the relationship of t1 ≧ t2 is established with the period (t2) of V1.
【0065】直流電源を用いた従来の方式では、処理土
壌中の重金属類は、重金属イオンとして電気泳動及び電
気浸透の作用により処理土壌に浸漬させた溶液ととも
に、通常、陰極電極側に移動する。In the conventional method using a DC power source, the heavy metals in the treated soil usually move to the cathode electrode side together with the solution immersed in the treated soil as heavy metal ions by the action of electrophoresis and electroosmosis.
【0066】しかし、本実施形態で用いた電源では、一
部負方向の電圧が含まれており、ある周波数でもって正
負の両方向に電圧が切り替わる=電極の極性が切り替わ
るため、電極近傍では、水の電気分解反応が進行する前
に極性が切り替わる。このとき、陽極部では水の電気分
解に起因する水素イオンの発生が抑えられて、強酸性化
は起こらず、電極の溶損が抑えられる。However, in the power source used in this embodiment, the voltage in the negative direction is partially included, and the voltage is switched in both the positive and negative directions at a certain frequency = the polarity of the electrode is switched. The polarity switches before the electrolysis reaction of. At this time, generation of hydrogen ions due to electrolysis of water is suppressed in the anode part, strong acidification does not occur, and dissolution loss of the electrode is suppressed.
【0067】図3は、本発明法および従来法で汚染土壌
の浄化を行なった場合の、陽極の重量の経時変化を比較
して示す図である。この図で明らかなように従来法(破
線)では陽極の溶損(重量変化)が激しいが、本発明法
(実線)では陽極の重量はほとんど変化せず、陽極の耐
用寿命が長い。従って、陽極に高価な貴金属を用いる必
要がなく、例えば鉄系の電極が使用可能となりコストを
削減できる。FIG. 3 is a graph showing changes in the weight of the anode with time when the contaminated soil was purified by the method of the present invention and the conventional method. As is clear from this figure, in the conventional method (broken line), the erosion loss (weight change) of the anode is severe, but in the method of the present invention (solid line), the weight of the anode hardly changes, and the useful life of the anode is long. Therefore, it is not necessary to use an expensive noble metal for the anode, and for example, an iron-based electrode can be used, and the cost can be reduced.
【0068】一方、陰極部では、水の電気分解に起因す
る水酸化物イオンの発生が抑えられ、強アルカリ化は起
こらない。従って、土壌を適正なpHにコントロールす
るために添加する鉱酸濃度を従来法よりも低くすること
が可能となり、陰極近傍の土壌内で重金属類が不溶化・
沈殿するという問題は生じなかった。On the other hand, in the cathode part, generation of hydroxide ions due to electrolysis of water is suppressed, and strong alkalinity does not occur. Therefore, it becomes possible to lower the concentration of the mineral acid added to control the soil to an appropriate pH, as compared to the conventional method, and the heavy metals are insolubilized in the soil near the cathode.
The problem of precipitation did not occur.
【0069】図4は陽極近くの土壌、陰極近くの土壌、
ならびにその間の土壌の電位を測定した電位特性図で、
横軸に土壌の位置、縦軸に電位を示している。実線の
a)は本発明法、破線のb)とc)は従来法の特性曲線
である。この図から明らかなように、本発明法a)では
両電極間の電位の勾配はほぼ等しいが、本発明a)と同
じ電圧E1を両電極間にかけても従来法b)では、陰極
近傍で急激な電位差があり、陽極から中央部近傍までの
土壌での電位勾配(角度θb)が小さい。電気泳動効果
は電位勾配が大きいほど大きくなることから、従来法
b)では陽極から中央部近傍までの電気泳動効果は小さ
くなると考えられる。FIG. 4 shows soil near the anode, soil near the cathode,
And a potential characteristic diagram that measured the potential of the soil in between,
The horizontal axis shows the soil position and the vertical axis shows the potential. The solid line a) is the characteristic curve of the method of the present invention, and the broken lines b) and c) are the characteristic curves of the conventional method. As is apparent from this figure, in the method a) of the present invention, the potential gradients between the electrodes are almost equal, but even when the same voltage E1 as in the invention a) is applied between the electrodes, in the method b) of the related art, it is sharp in the vicinity of the cathode. There is a large potential difference, and the potential gradient (angle θb) in the soil from the anode to near the center is small. Since the electrophoretic effect increases as the potential gradient increases, it is considered that the electrophoretic effect from the anode to the vicinity of the central portion decreases in the conventional method b).
【0070】また陰極近傍の急な電位勾配は、陰極近傍
での電気抵抗の増加に起因するものであり、陰極近傍で
のジュール熱の発生の原因となる。陰極近傍の電気抵抗
の増加の原因は、陰極電極水の電気分解に基づく強アル
カリ化→陰極近傍での重金属類の不溶化である。従っ
て、この領域では、重金属類は不溶化していると考えら
れ、電位勾配が大きくなっていても、電気泳動効果は非
常に小さい。The steep potential gradient in the vicinity of the cathode is due to an increase in electrical resistance in the vicinity of the cathode, which causes Joule heat in the vicinity of the cathode. The cause of the increase in electric resistance near the cathode is strong alkalinization due to electrolysis of cathode electrode water → insolubilization of heavy metals near the cathode. Therefore, it is considered that the heavy metals are insoluble in this region, and the electrophoretic effect is very small even if the potential gradient is large.
【0071】従来法b)よりも電気泳動効果を上げるた
めには、さらに両電極間の電圧を上げる必要がある。従
来法c)に電圧をE2まで上げたときの状態を示す。こ
の時の電位勾配(角度θc)が、本発明での電位勾配
(θa)とほぼ同等である。In order to improve the electrophoretic effect as compared with the conventional method b), it is necessary to further increase the voltage between both electrodes. The conventional method c) shows the state when the voltage is raised to E2. The potential gradient (angle θc) at this time is almost equal to the potential gradient (θa) in the present invention.
【0072】この場合さらに陰極電極水の電気分解が促
進し、強アルカリ化領域が拡大てし、陰極での電気抵抗
が増大し、電位勾配が増加していることがわかる。従っ
て、ジュール熱発生量が増え、電気エネルギーの無駄使
いとなる。In this case, it can be seen that the electrolysis of the cathode electrode water is further promoted, the strongly alkalized region is expanded, the electric resistance at the cathode is increased, and the potential gradient is increased. Therefore, the amount of Joule heat generated increases, resulting in a waste of electric energy.
【0073】本発明法a)では、土壌中の電位勾配(θ
a)は土壌全域で一定に保たれており、電気泳動効果は
従来法b)と比べて高いこと分かる。このように本発明
では、印加した電気エネルギーは、水の電気分解、土壌
のジュール熱発生等に使われることはなく、その大部分
が重金属類の電気泳動に使用されるため、無駄が非常に
少なく、効率よく重金属類を電気泳動できる。In the method a) of the present invention, the potential gradient (θ
It can be seen that a) is kept constant throughout the soil and the electrophoretic effect is higher than in the conventional method b). As described above, in the present invention, the applied electric energy is not used for electrolysis of water, generation of Joule heat of soil, etc., and most of it is used for electrophoresis of heavy metals, so that waste is extremely large. Fewer and more efficient heavy metal electrophoresis.
【0074】本実施形態では、正弦波、パルス波、矩形
波、鋸波、三角波等は、正と負のサイクルの電流積分値
が(正≧負)となるように制御されているため、相対的
に重金属イオン(陽イオンの場合)の電気泳動は、陽極
電極4から陰極電極5への方向に進行する。当然、正と
負のサイクルの積分値の差が大きいほど、電気泳動の速
度は増加する傾向となる。In this embodiment, since the sine wave, the pulse wave, the rectangular wave, the sawtooth wave, the triangular wave, etc. are controlled so that the integrated current value of the positive and negative cycles becomes (positive ≧ negative), Electrophoresis of heavy metal ions (in the case of positive ions) progresses in the direction from the anode electrode 4 to the cathode electrode 5. Naturally, the larger the difference between the integral values of the positive and negative cycles, the higher the speed of electrophoresis tends to be.
【0075】本実施形態では、土壌が強アルカリ性であ
った場合を想定して、陰極電極5近傍の陰極電極設置室
3、または処理土壌11の陰極近傍に酸供給ポンプ1
4、酸配管15を用いて酸を加えて、酸性化する手段を
講じている。これにより、土壌中にて水酸化物として不
溶化した重金属類は、溶解して処理土壌11中の水分と
ともに陰極電極設置室3側に移動し、処理土壌11か
ら、重金属類が溶解した陰極電極水8を分離する。そし
て陰極電極水8を陰極電極水排出ポンプ13で回収する
ことにより、重金属類を溶液として回収除去することが
できる。In the present embodiment, assuming that the soil is strongly alkaline, the acid supply pump 1 is installed near the cathode electrode installation chamber 3 near the cathode electrode 5 or near the cathode of the treated soil 11.
4. The acid pipe 15 is used to add acid to acidify it. As a result, the heavy metals insolubilized as hydroxide in the soil are dissolved and moved to the cathode electrode installation chamber 3 side together with the water in the treated soil 11, and the treated metal 11 dissolves the cathodic electrode water in which the heavy metals are dissolved. Separate 8 Then, by collecting the cathode electrode water 8 by the cathode electrode water discharge pump 13, the heavy metals can be collected and removed as a solution.
【0076】また、陽極電極水7を鉱酸水溶液にするこ
とにより、処理土壌11全体を酸性化させる方法もあ
る。There is also a method of acidifying the entire treated soil 11 by using a mineral acid aqueous solution as the anode electrode water 7.
【0077】図5は、印加電流の周波数と重金属除去効
果との関係を示す特性図である。横軸は周波数、縦軸は
一定時間運転後の重金属の除去率を示している。1H
z、10Hzと1000Hz以上とで比較すると、10
00Hz以上の方が除去率は高いことがわかった。これ
はあまり低周波数とすると、電極の極性を切り替える前
に、水の電気分解反応が起きてしまい、そちらに電気エ
ネルギーを消耗するためであると考えられる。また、電
波障害等、系外への影響を考えると100kHz以上と
するのは困難であるため、1Hz〜100kHz程度、
特に1kHz〜50kHz程度で用いるのが望ましい。FIG. 5 is a characteristic diagram showing the relationship between the frequency of the applied current and the heavy metal removing effect. The horizontal axis shows the frequency, and the vertical axis shows the heavy metal removal rate after a certain period of operation. 1H
z, 10 Hz and 1000 Hz or higher, 10
It was found that the removal rate was higher at 00 Hz or higher. It is considered that this is because if the frequency is too low, the electrolysis reaction of water occurs before switching the polarity of the electrode, and the electric energy is consumed there. In addition, it is difficult to set the frequency to 100 kHz or more in consideration of the influence on the outside of the system such as radio interference, so about 1 Hz to 100 kHz,
Particularly, it is desirable to use it at about 1 kHz to 50 kHz.
【0078】正弦波、パルス波、矩形波、鋸波、三角波
等を、正と負のサイクルの電流積分値が等しく(正=
負)なるように制御した場合や、あるいは交流電源を用
いた場合などには、電気泳動効果による重金属イオンの
移動は起こらないが、同様に電極の溶損はほとんど起き
ない。重金属を除去するには、処理土壌11中に浸漬さ
せた溶液の流れに搬送させて、陰極電極設置室3から陰
極電極水8を陰極電極水排出ポンプ13で回収して、浸
漬した溶液を順次置換していくことにより、重金属類を
溶液として回収除去することができる。For sine wave, pulse wave, rectangular wave, sawtooth wave, triangular wave, etc., the current integration values of the positive and negative cycles are equal (positive =
When it is controlled to be negative), or when an AC power source is used, the migration of heavy metal ions due to the electrophoretic effect does not occur, but similarly, the electrode is hardly melted. In order to remove the heavy metal, the solution is soaked in the treated soil 11 and the cathode water 8 is collected from the cathode electrode installation chamber 3 by the cathode water discharge pump 13, and the soaked solution is sequentially removed. By substituting, the heavy metals can be recovered and removed as a solution.
【0079】ただし、本発明は、本実施形態に示す装置
構成のみに限定されるものではなく、同様の原理を用い
たあらゆる形態の汚染土壌浄化装置に適用可能である。
例えば重金属のうち、陰イオン化するものや、両性イオ
ンなどについては、陽極に移動するものも考えられるの
で、その場合は溶液の回収位置を陽極電極設置室として
も良いし、処理土壌の中間から回収することも、両極か
ら同時に回収する方法も考えられる。溶液を供給する方
向に付いても同様に変化させることが可能である。ま
た、溶液で回収するのみでなく、重金属吸着剤などを用
いた回収方法もある。However, the present invention is not limited to the device configuration shown in the present embodiment, and can be applied to all forms of polluted soil cleaning devices using the same principle.
For example, among heavy metals, those that are anionized or zwitterions may move to the anode.In that case, the solution collection position may be the anode electrode installation room, or the solution may be collected from the middle of the treated soil. Alternatively, a method of simultaneously recovering from both electrodes may be considered. The solution supply direction can be changed in the same manner. There is also a recovery method using not only a solution but also a heavy metal adsorbent.
【0080】図6は、本発明の第2の実施形態を説明す
るための波形図と電源装置の回路図である。図中の18
は交流電源、19はトランス、20は整流器、21は電
極、22はSCR制御回路である。この汚染土壌浄化方
法に用いる印加電流の波形は同図に示すようになってお
り、網点部が印加する電圧値である。FIG. 6 is a waveform diagram and a circuit diagram of a power supply device for explaining the second embodiment of the present invention. 18 in the figure
Is an AC power supply, 19 is a transformer, 20 is a rectifier, 21 is an electrode, and 22 is an SCR control circuit. The waveform of the applied current used in this method for cleaning contaminated soil is as shown in the figure, and is the voltage value applied by the halftone dot portion.
【0081】本方式では同図に示す電源装置を用い、正
弦波、パルス波、矩形波、鋸波または三角波等におい
て、負の部分を大部分カットし、正と負のサイクルの電
流積分値の差(正−負)が正値となるように制御した波
形を持った電流を印加する。このような波形の電流を用
いても、第1の実施形態と同様に効率的に重金属類の電
気泳動を起こすことができる。In this system, the power supply device shown in the same figure is used, and most of the negative part of the sine wave, pulse wave, rectangular wave, sawtooth wave, triangular wave, etc. is cut, and the integrated current values of the positive and negative cycles are A current having a waveform controlled so that the difference (positive-negative) has a positive value is applied. Even if the current having such a waveform is used, it is possible to efficiently cause the electrophoresis of heavy metals as in the first embodiment.
【0082】図7は、本発明の第3の実施形態を説明す
るための波形図図である。本実施形態では同図に示すよ
うに、一定期間で交流電流をON−OFFして負領域の
大部分および正領域の一部をカットする方法を採用して
おり、網点部が印加する電圧値である。本実施形態の場
合、OFFの期間分だけ電流が流れていないため、省電
力化が図れる。FIG. 7 is a waveform diagram for explaining the third embodiment of the present invention. In the present embodiment, as shown in the figure, a method of cutting off most of the negative region and part of the positive region by turning on / off the alternating current in a certain period is adopted. It is a value. In the case of the present embodiment, since no current flows for the OFF period, power saving can be achieved.
【0083】図7に示すように、正領域の負から正に変
わった部分の一部をカットし、正領域への立ち上がりを
急峻にした場合、土壌中の金属イオンに対しては、該当
期間で急激に陰極に引かれる力を受けることになり、正
弦波を用いたときのように正領域が滑らかに立ち上がる
場合よりも、慣性力が高くなる効果があり、より望まし
い。図7に示す波形は、図6と同様の電源装置を用い、
制御方法を変えることで実施可能である。As shown in FIG. 7, when a portion of the positive region which has changed from negative to positive is cut and the rising to the positive region is made steep, for the metal ion in the soil, the corresponding period This is more desirable because it has the effect of rapidly increasing the inertial force, as compared with the case where the positive region rises smoothly as in the case of using a sine wave, because the force is suddenly drawn by the cathode. The waveform shown in FIG. 7 uses the same power supply device as in FIG.
It can be implemented by changing the control method.
【0084】[0084]
【発明の効果】本発明は前述のような構成になってお
り、その効果は下記の通りである。
1).電極近傍での電極水の電気分解反応は、極性の変換
が起こることにより、抑えられる。従って、印加した電
気エネルギーは電極水の電気分解反応に使われず、有効
利用できる。The present invention is constructed as described above, and its effects are as follows. 1). The electrolysis reaction of the electrode water near the electrodes is suppressed by the conversion of the polarity. Therefore, the applied electric energy is not used in the electrolysis reaction of the electrode water, and can be effectively used.
【0085】2).電極水のpHの急激な変化を抑えるこ
とができ、電極の溶損を抑え、電極寿命を延ばすことが
可能となる。また、安価な電極を用いることができる。2). It is possible to suppress a sharp change in the pH of the electrode water, suppress the melting loss of the electrode, and extend the life of the electrode. Moreover, an inexpensive electrode can be used.
【0086】3).特に陰極土壌の強アルカリ化を抑えら
れるので、陰極近傍での土壌の電気抵抗を増加させる要
因がなくなり、ジュール熱の発生を抑えられる。3). In particular, since strong alkalinity of the cathode soil can be suppressed, there is no factor that increases the electric resistance of the soil near the cathode, and generation of Joule heat can be suppressed.
【0087】4).比較的低い電圧値でも重金属の電気泳
動効果を効率的に高めることができ、ジュール熱による
電極水の蒸発、重金属類の系外への飛散を抑えることが
できる。4). The electrophoretic effect of heavy metals can be efficiently enhanced even with a relatively low voltage value, and the evaporation of electrode water due to Joule heat and the scattering of heavy metals out of the system can be suppressed.
【図1】本発明の第1の実施形態に基づく汚染土壌の浄
化方法を説明するための図である。FIG. 1 is a diagram for explaining a method for purifying contaminated soil according to a first embodiment of the present invention.
【図2】その第1の実施形態での各種印加電圧波形図で
ある。FIG. 2 is a waveform diagram of various applied voltages in the first embodiment.
【図3】その第1の実施形態と従来法を実施した場合の
陽極電極重量の経時変化を示す図である。FIG. 3 is a view showing a change with time of an anode electrode weight when the first embodiment and a conventional method are carried out.
【図4】その第1の実施形態と従来法での土壌中の電位
を示す特性図である。FIG. 4 is a characteristic diagram showing a potential in soil according to the first embodiment and a conventional method.
【図5】その第1の実施形態において印加電流の周波数
と重金属類除去率との関係を示す特性図である。FIG. 5 is a characteristic diagram showing a relationship between a frequency of an applied current and a heavy metal removal rate in the first embodiment.
【図6】本発明の第2の実施形態における印加電圧波形
と電源装置の回路図である。FIG. 6 is a circuit diagram of an applied voltage waveform and a power supply device according to a second embodiment of the present invention.
【図7】本発明の第3の実施形態における印加電圧波形
図である。FIG. 7 is an applied voltage waveform diagram in the third embodiment of the present invention.
【図8】従来の直流電流印加型の汚染土壌浄化方法を説
明するための図である。FIG. 8 is a diagram for explaining a conventional DC current application type contaminated soil cleaning method.
【図9】従来の他の直流電流印加型の汚染土壌浄化方法
を説明するための図である。FIG. 9 is a diagram for explaining another conventional DC current application type contaminated soil cleaning method.
【図10】従来の交流電源を半波整流した直流を用いた
汚染土壌浄化方法を説明するための図である。FIG. 10 is a diagram for explaining a conventional polluted soil purification method using a direct current obtained by half-wave rectifying an alternating current power supply.
【図11】従来の半波整流電源を用いた汚染土壌浄化方
法を説明するための図である。FIG. 11 is a diagram for explaining a contaminated soil purification method using a conventional half-wave rectification power supply.
1:土壌処理槽、2:陽極電極設置室、3:陰極電極設
置室、4:陽極電極、5:陰極電極、6:フィルタ、
7:陽極電極水、8:陰極電極水、9:陽極電極水供給
ポンプ、10:陽極配管、11:処理土壌、12:陰極
配管、13:陰極電極水排出ポンプ、14:酸供給ポン
プ、15:酸供給配管、16:電源装置、17:電気配
線、18:交流電源、19:トランス、20:整流器、
21:電極、22:SCR制御回路1: Soil treatment tank, 2: Anode electrode installation room, 3: Cathode electrode installation room, 4: Anode electrode, 5: Cathode electrode, 6: Filter,
7: anode electrode water, 8: cathode electrode water, 9: anode electrode water supply pump, 10: anode pipe, 11: treated soil, 12: cathode pipe, 13: cathode electrode water discharge pump, 14: acid supply pump, 15 : Acid supply pipe, 16: Power supply device, 17: Electric wiring, 18: AC power supply, 19: Transformer, 20: Rectifier,
21: electrode, 22: SCR control circuit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 伊藤 守男 広島県呉市宝町6番9号 バブコック日立 株式会社呉事業所内 (72)発明者 野村 洋 広島県呉市宝町6番9号 バブコック日立 株式会社呉事業所内 (72)発明者 松本 真一 広島県呉市宝町6番9号 バブコック日立 株式会社呉事業所内 (72)発明者 植中 忠男 広島県呉市宝町6番9号 バブコック日立 株式会社呉事業所内 Fターム(参考) 4D004 AA41 AB03 AC04 CA44 CC03 CC12 DA02 DA03 DA20 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Morio Ito Babcock Hitachi 6-9 Takaracho, Kure City, Hiroshima Prefecture Kure Office Co., Ltd. (72) Inventor Hiroshi Nomura Babcock Hitachi 6-9 Takaracho, Kure City, Hiroshima Prefecture Kure Office Co., Ltd. (72) Inventor Shinichi Matsumoto Babcock Hitachi 6-9 Takaracho, Kure City, Hiroshima Prefecture Kure Office Co., Ltd. (72) Inventor Tadao Uenaka Babcock Hitachi 6-9 Takaracho, Kure City, Hiroshima Prefecture Kure Office Co., Ltd. F-term (reference) 4D004 AA41 AB03 AC04 CA44 CC03 CC12 DA02 DA03 DA20
Claims (10)
て電極を設置し,両電極間に電流を流して、土壌中の汚
染物質を取り除く汚染土壌浄化方法において、 前記電流の波形が矩形波,正弦波,パルス波,鋸波また
は三角波であって、その印加電流の電圧が正領域と負領
域で時間と共に推移して、電圧が正の期間の電流積分値
と負の期間の電流積分値が等しいか、またはこの積分値
の差(正−負)が正値であることを特徴とする汚染土壌
浄化方法。1. A method for purifying contaminated soil, wherein electrodes are installed in wet contaminated soil at a predetermined interval, and an electric current is applied between both electrodes to remove pollutants in the soil. Wave, sine wave, pulse wave, sawtooth wave, or triangular wave, the voltage of the applied current changes with time in the positive region and the negative region, and the voltage integral of the positive period and the current integral of the negative period A method for purifying contaminated soil, characterized in that the values are equal or the difference (positive-negative) in the integrated value is a positive value.
て電極を設置し,両電極間に電流を流して、土壌中の汚
染物質を取り除く汚染土壌浄化方法において、 前記印加電流の波形が波形発生器を通じて得られる、電
圧が正領域と負領域で時間と共に推移するものであっ
て、 電圧が正の期間の電流積分値と負の期間の電流積分値が
等しいか,またはこの積分値の差(正−負)が正値であ
ることを特徴とする汚染土壌浄化方法。2. A method for purifying contaminated soil, wherein electrodes are installed in wet contaminated soil at predetermined intervals, and a current is applied between both electrodes to remove pollutants in the soil. The voltage obtained through the waveform generator changes with time in the positive and negative regions, and the current integral value in the positive period and the current integral value in the negative period are equal to each other, or A method for cleaning contaminated soil, wherein the difference (positive-negative) is a positive value.
て電極を設置し,両電極間に電流を流して、土壌中の汚
染物質を取り除く汚染土壌浄化方法において、 時刻tにおいてV(t)で示される印加電流の電圧が正領
域と負領域で時間と共に推移して、 電圧V(t)が正値である期間をt1,負値である期間を
t2とした場合、電圧の絶対値|V(t)|に関して、 【数1】 の関係が成立することを特徴とする汚染土壌浄化方法。3. A polluted soil purification method for removing pollutants in soil by installing electrodes at a predetermined interval in wet polluted soil and applying a current between both electrodes to remove V (t) at time t. ), The voltage of the applied current changes with time in the positive region and the negative region, and when the period when the voltage V (t) is a positive value is t1 and the period when the voltage V (t) is a negative value is t2, the absolute value of the voltage Regarding | V (t) | The method for purifying contaminated soil, characterized in that
て電極を設置し,両電極間に電流を流して、土壌中の汚
染物質を取り除く汚染土壌浄化方法において、 前記印加電流の電圧が、一定電圧(+V1:正値)と、一
定電圧(−V2:負値)間で推移し、正値(+V1)である
期間(t1)と負値(−V2)である期間(t2)との間に、 (V1×t1) ≧ (V2×t2) の関係が成立することを特徴とする汚染土壌浄化方法。4. A polluted soil purification method for removing pollutants in soil by installing electrodes in wet polluted soil at a predetermined interval, and applying an electric current between the electrodes to remove pollutants in the soil. , A constant voltage (+ V1: positive value) and a constant voltage (-V2: negative value), and a positive value (+ V1) period (t1) and a negative value (-V2) period (t2). The method for purifying contaminated soil, characterized in that the relationship of (V1 × t1) ≧ (V2 × t2) is established between the two.
て電極を設置し,両電極間に電流を流して、土壌中の汚
染物質を取り除く汚染土壌浄化方法において、 前記印加電流の電圧が,±V1(V1:正値)間で推移
し、かつ、+V1である期間(t1)と−V1である期間
(t2)との間に,t1≧t2の関係が成立することを特
徴とする汚染土壌浄化方法。5. A method for purifying contaminated soil, wherein electrodes are installed in wet contaminated soil at predetermined intervals, and a current is applied between the electrodes to remove contaminants in the soil. , ± V1 (V1: positive value), and a period of + V1 (t1) and a period of −V1
A method for purifying contaminated soil, characterized in that a relationship of t1 ≧ t2 is established with (t2).
て電極を設置し,両電極間に電流を流して、土壌中の汚
染物質を取り除く汚染土壌浄化方法において、 前記印加電流の波形が、交流波形の0V以下の領域の一
部をカットした波形をなすことを特徴とする汚染土壌浄
化方法。6. A method for purifying contaminated soil, wherein electrodes are installed at a predetermined interval in wet contaminated soil, and an electric current is applied between both electrodes to remove pollutants in the soil. A method for purifying contaminated soil, which comprises forming a waveform in which a part of an AC waveform of 0 V or less is cut.
の請求項記載の汚染土壌浄化方法において、前記電流の
周波数が0.01Hz〜1000kHzの範囲内にある
ことを特徴とする汚染土壌浄化方法。7. The method for cleaning contaminated soil according to claim 1, wherein the frequency of the electric current is in the range of 0.01 Hz to 1000 kHz. Method.
て、前記電流の周波数が50Hz〜10kHzの範囲内
にあることを特徴とする汚染土壌浄化方法。8. The method for purifying contaminated soil according to claim 7, wherein the frequency of the electric current is in the range of 50 Hz to 10 kHz.
て設置される複数の電極と、 その電極に印加する電流の電圧が正領域と負領域で時間
と共に推移し、電圧が正の期間の電流積分値と負の期間
の電流積分値が等しいか、またはこの積分値の差(正−
負)が正値であるような電流を印加するための電源装置
とを備えることを特徴とする汚染土壌浄化装置。9. A plurality of electrodes installed at a predetermined interval in wet contaminated soil, and a voltage of a current applied to the electrodes changes with time in a positive region and a negative region, and the voltage is in a positive period. Is equal to the current integrated value in the negative period, or the difference (positive −
A contaminated soil purification device, comprising: a power supply device for applying a current such that (negative) is a positive value.
いて設置される複数の電極と、 その電極に印加する電流の波形が、交流波形の0V以下
の領域の一部をカットした波形をなす電源装置とを備え
ることを特徴とする汚染土壌浄化装置。10. A plurality of electrodes installed at a predetermined interval in wet contaminated soil, and a waveform of a current applied to the electrodes is a waveform obtained by cutting a part of a region of 0 V or less of an AC waveform. An apparatus for purifying contaminated soil, comprising an eggplant power supply device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002096987A JP2003290760A (en) | 2002-03-29 | 2002-03-29 | Method and apparatus for decontaminating contaminated soil |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002096987A JP2003290760A (en) | 2002-03-29 | 2002-03-29 | Method and apparatus for decontaminating contaminated soil |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2003290760A true JP2003290760A (en) | 2003-10-14 |
Family
ID=29239773
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2002096987A Pending JP2003290760A (en) | 2002-03-29 | 2002-03-29 | Method and apparatus for decontaminating contaminated soil |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2003290760A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100735037B1 (en) | 2005-12-09 | 2007-07-06 | 고등기술연구원연구조합 | Electrokinetic remediation system of contaminated soil by Pulse power and Catalytic electrode |
KR100735036B1 (en) * | 2005-10-26 | 2007-07-06 | 고등기술연구원연구조합 | Apparatus for resistance controll and method of contaminated soil by Pulse power |
CN101838740A (en) * | 2010-04-09 | 2010-09-22 | 中钢集团武汉安全环保研究院有限公司 | Method for removing soluble heavy metal ions in situ |
WO2021120860A1 (en) * | 2019-12-20 | 2021-06-24 | 清华大学 | Device and apparatus for treating organic pollutants in soil and underground water |
-
2002
- 2002-03-29 JP JP2002096987A patent/JP2003290760A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100735036B1 (en) * | 2005-10-26 | 2007-07-06 | 고등기술연구원연구조합 | Apparatus for resistance controll and method of contaminated soil by Pulse power |
KR100735037B1 (en) | 2005-12-09 | 2007-07-06 | 고등기술연구원연구조합 | Electrokinetic remediation system of contaminated soil by Pulse power and Catalytic electrode |
CN101838740A (en) * | 2010-04-09 | 2010-09-22 | 中钢集团武汉安全环保研究院有限公司 | Method for removing soluble heavy metal ions in situ |
WO2021120860A1 (en) * | 2019-12-20 | 2021-06-24 | 清华大学 | Device and apparatus for treating organic pollutants in soil and underground water |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6583868B2 (en) | Composite membrane separation method applied to desalination and recovery of sewage | |
CN109731905B (en) | Autonomous controllable electric acidification dissociation device and method for soil or substrate sludge pollutants | |
AU2004272647A1 (en) | An electrolytic cell for removal of material from a solution | |
CN109513741A (en) | Device and restorative procedure for repairing polluted soil | |
JP3635349B2 (en) | Waste water treatment method and apparatus | |
JP2749258B2 (en) | Exhaust gas treatment method and apparatus | |
KR101776287B1 (en) | A device for prevention of scale form and a water sealing of multipurpose | |
JP2003290760A (en) | Method and apparatus for decontaminating contaminated soil | |
CN103819036B (en) | Treating method for desulfurization waste water of power plant | |
CN108314149A (en) | Desulfurization wastewater is electrolysed and its method of product denitrification integral | |
JPH0947748A (en) | Polluted soil purifying method | |
JP4362587B2 (en) | Pollutant removal method and contaminant removal apparatus using electroosmotic flow | |
WO1999038807A1 (en) | Water purifying means | |
TW200427634A (en) | Fluid deionization system | |
JPH11128901A (en) | Method and apparatus for purifying polluted soil | |
JP4438570B2 (en) | Scale recovery device | |
JPH09220577A (en) | Electrolyzing apparatus | |
JP2000334462A (en) | Packed bed type electrochemical water treating device and method therefor | |
KR20070045013A (en) | Resistance controlling system and method of contaminated soil by pulse power | |
CN105692872B (en) | Method for removing zinc ions in electroplating wastewater by using pulsed high-voltage electricity-microorganism flocculation reaction tank | |
JP2738890B2 (en) | Oil-water separator using electrolysis | |
CN217732753U (en) | Pulse electric flocculation equipment for removing heavy metals | |
JP2002273404A (en) | Purification method of contaminated soil | |
JP6990905B2 (en) | Oil-water separation device and oil-water separation method | |
CN214611688U (en) | Sewage electrolysis device for preventing polar plate from being passivated |