JPH04225886A - Method for decontaminating contaminated area - Google Patents
Method for decontaminating contaminated areaInfo
- Publication number
- JPH04225886A JPH04225886A JP2416105A JP41610590A JPH04225886A JP H04225886 A JPH04225886 A JP H04225886A JP 2416105 A JP2416105 A JP 2416105A JP 41610590 A JP41610590 A JP 41610590A JP H04225886 A JPH04225886 A JP H04225886A
- Authority
- JP
- Japan
- Prior art keywords
- water
- contaminated soil
- contaminated
- harmful substances
- hole
- 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
- 238000000034 method Methods 0.000 title claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 65
- 239000002689 soil Substances 0.000 claims abstract description 57
- 239000003673 groundwater Substances 0.000 claims abstract description 25
- 238000005406 washing Methods 0.000 claims abstract description 19
- 238000005086 pumping Methods 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims description 42
- 238000005192 partition Methods 0.000 claims description 17
- 239000012466 permeate Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 abstract description 6
- 239000010959 steel Substances 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract 2
- 238000011282 treatment Methods 0.000 description 16
- 238000004140 cleaning Methods 0.000 description 15
- 238000010586 diagram Methods 0.000 description 5
- 238000000746 purification Methods 0.000 description 4
- 238000011109 contamination Methods 0.000 description 3
- 229910052785 arsenic Inorganic materials 0.000 description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical class [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001784 detoxification Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は汚染地の浄化方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for purifying contaminated areas.
【０００２】0002
【従来の技術】工場の跡地などは、シアン化合物、６価
クロム化合物、鉛、カドミウム、水銀、ヒ素などの有害
物で汚染されていることが多い。これら有害物は地下水
中に浸透し、地下水を汚染することから除去されねばな
らないが、従来これら有害物を除去するには、汚染土壌
を排土して非汚染土壌で埋め立て、拝土した汚染土壌は
トラック等により一次処理地に搬入し、ここでコンクリ
ート詰め、または焼却などの無害化処理を行い、二次処
理地の埋め立て地などに搬入して埋め立てるなどの処理
を行っている。2. Description of the Related Art Former factory sites are often contaminated with harmful substances such as cyanide compounds, hexavalent chromium compounds, lead, cadmium, mercury, and arsenic. These harmful substances permeate into the groundwater and contaminate the groundwater, so they must be removed. Conventionally, the conventional methods of removing these harmful substances are to drain the contaminated soil and fill it with non-contaminated soil, and then to replace the contaminated soil with soil. The waste is transported by truck or the like to a primary treatment site, where it undergoes detoxification treatment such as being filled with concrete or incinerated, and then transported to a secondary treatment site, such as a landfill, where it is buried.
【０００３】0003
【発明が解決しようとする課題】しかしながら、上記の
従来の方法によるときは、汚染地が工場の跡地等の場合
排土すべき汚染土壌が極めて大量となり、排土、客土に
多大の労力、工数を要する他、トラックなどによる運搬
費用が莫大となり、コストがかかるという問題がある。
また昨今は埋め立て地が不足であり、容易に埋め立て処
理が行い難いという問題もある。さらにはこのような埋
め立て処理では有害物が溶出し、二次公害が発生し易い
という問題もある。[Problems to be Solved by the Invention] However, when using the above-mentioned conventional method, if the contaminated land is the site of a factory, an extremely large amount of contaminated soil must be removed, and a great deal of labor and effort is required to remove and replace the soil. In addition to requiring a lot of man-hours, there is a problem in that the cost of transportation by trucks and the like is enormous, which increases costs. Another problem is that there is currently a shortage of landfill sites, making it difficult to carry out landfill treatment. Furthermore, there is also the problem that harmful substances are leached out in such landfill treatment, which tends to cause secondary pollution.
【０００４】そこで本発明では上記問題点を解消し、コ
ストのかからない、かつ公害問題の発生を防止できる汚
染地の浄化方法を提供することを目的とする。SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method for purifying contaminated areas that is inexpensive and capable of preventing pollution problems by solving the above-mentioned problems.
【０００５】[0005]
【課題を解決するための手段】上記目的は本発明によれ
ば次の方法により達成される。すなわち、汚染地に穴を
掘って汚染土壌を掘り上げ、該穴の少なくとも底面を覆
ってシートを敷き、穴内に水汲み上げ用のパイプを配設
し、穴内に前記掘り上げた汚染土壌を埋め戻すと共に、
該埋め戻した汚染土壌に洗浄水を浸透させて汚染土壌中
の有害物を洗浄水中に溶解させ、前記シート上にたまっ
た有害物を含む洗浄水を前記パイプを通じて汲み上げ、
汲み上げた洗浄水中から有害物を除去する操作を繰り返
すことを特徴とする汚染地の浄化方法により達成される
。また、汚染地の汚染土壌を囲って地中に隔壁を下端が
地下水よりも下方の地中に進入するよう打ち込み、該隔
壁に囲まれた汚染土壌中に、下端が地下水中に位置する
ように水汲み上げ用のパイプを配設すると共に、該パイ
プを通じて地下水を汲み上げ、汲み上げた水から有害物
を除去する処理を行い、該有害物を除去した水を洗浄水
として汚染土壌中に浸透させて汚染土壌中の有害物を溶
解させて地下水中に流下させる処理を繰り返すことを特
徴とする汚染地の浄化方法により達成される。[Means for Solving the Problems] The above object is achieved according to the present invention by the following method. That is, a hole is dug in the contaminated land and the contaminated soil is dug up, a sheet is spread over at least the bottom of the hole, a pipe for pumping up water is placed in the hole, and the contaminated soil dug up is backfilled into the hole. With,
Infiltrating the backfilled contaminated soil with cleaning water to dissolve harmful substances in the contaminated soil into the cleaning water, and pumping up the cleaning water containing the harmful substances accumulated on the sheet through the pipe,
This is achieved by a method for purifying contaminated areas, which is characterized by repeating the operation of removing harmful substances from pumped washing water. In addition, a partition wall surrounding the contaminated soil in the contaminated area is driven into the ground so that the lower end enters the ground below the groundwater, and the lower end is located in the groundwater in the contaminated soil surrounded by the partition wall. In addition to installing pipes for pumping up water, groundwater is pumped up through the pipes, and the pumped water is treated to remove harmful substances, and the water from which the harmful substances have been removed is used as washing water and permeates into the contaminated soil, causing contamination. This is achieved by a method for purifying contaminated land, which is characterized by repeating the process of dissolving harmful substances in the soil and causing them to flow into groundwater.
【０００６】[0006]
【作用】請求項１では、汚染土壌の上から洗浄水を散布
すると、洗浄水が汚染土壌中に浸透し、有害物を溶解し
て流下し、シート上に溜まる。この有害物が混入してい
る洗浄水はパイプを通じて汲み上げられ、水処理層に流
入されて有害物が除去される。有害物が除去された洗浄
水は再び汚染土壌上に散布され、下方に浸透する。この
操作を繰り返すことによって汚染土壌中の有害物は次第
に取り除かれ、汚染土壌の洗浄が行える。請求項２では
、ポンプにより地下水を汲み上げ、水処理槽に流入し、
有害物を除去したのち洗浄水として汚染土壌上に散布す
る。洗浄水は汚染土壌中に浸透し、有害物を溶解して地
下水中に流下する。この操作を繰り返すことによって汚
染土壌中の有害物がやはり次第に減少し、汚染土壌の洗
浄が行えるのである。なお地下水は隔壁によって仕切ら
れているので非汚染区域の地下水中に有害物が混入した
洗浄水が流入することはなく、汚染が拡大するおそれは
ない。According to claim 1, when cleaning water is sprayed over contaminated soil, the cleaning water permeates into the contaminated soil, dissolves harmful substances, flows down, and accumulates on the sheet. The cleaning water contaminated with harmful substances is pumped up through a pipe and flows into a water treatment layer to remove harmful substances. The washed water, from which harmful substances have been removed, is sprayed over the contaminated soil again and permeates downward. By repeating this operation, harmful substances in the contaminated soil are gradually removed and the contaminated soil can be washed. In claim 2, groundwater is pumped up by a pump and flows into a water treatment tank,
After removing harmful substances, it is sprayed onto contaminated soil as washing water. The washing water penetrates into the contaminated soil, dissolves harmful substances, and flows down into the groundwater. By repeating this operation, the harmful substances in the contaminated soil are gradually reduced, and the contaminated soil can be washed. Since the groundwater is separated by partition walls, cleaning water contaminated with harmful substances will not flow into the groundwater in non-contaminated areas, and there is no risk of contamination spreading.
【０００７】[0007]
【実施例】以下、本発明の好適な実施例を添付図面に基
づいて詳細に説明する。まず、図１に示すように、工場
跡地などの有害物による汚染地の洗浄すべき個所の汚染
土壌を掘り上げ、穴１０を形成する。穴１０の深さはも
ちろん洗浄すべき汚染土壌の深さとする。次いで図２に
示すように、穴１０の内壁１３を隔壁１４で覆う。隔壁
１４は例えば図３に示すように、鋼矢板１５をつなぎ合
わせて容易に形成することができる。なお鋼矢板１５間
のつなぎ目は水がもれない程度にシールする。また穴１
０の底面にはビニールシートのような水の漏れないシー
ト１２で覆うようにする。さらに穴１０内にはそのほぼ
中央に水汲みだし用のパイプ１６を立設したのち、パイ
プ１６周辺を含めて穴１０内に上記掘り上げた汚染土壌
を埋め戻す。なおパイプ下端にはパイプが土砂によって
閉塞されないように穴あき筒体１７などを取り付けると
よい。パイプ上端は埋め戻した汚染土壌の上方に突出さ
せるようにする。パイプ１６にはポンプ１８を接続し、
ポンプ１８によって汲み上げられた水は別途設置した水
処理槽１９に流入させる。DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. First, as shown in FIG. 1, a hole 10 is formed by digging up contaminated soil at a location to be cleaned in a site contaminated by harmful substances such as a former factory site. The depth of the hole 10 is of course the depth of the contaminated soil to be cleaned. Next, as shown in FIG. 2, the inner wall 13 of the hole 10 is covered with a partition wall 14. The partition wall 14 can be easily formed by joining together steel sheet piles 15, for example, as shown in FIG. Note that the joints between the steel sheet piles 15 are sealed to the extent that water does not leak. Also hole 1
0 is covered with a water-proof sheet 12 such as a vinyl sheet. Furthermore, a pipe 16 for drawing water is erected approximately in the center of the hole 10, and then the contaminated soil dug up is backfilled into the hole 10, including the area around the pipe 16. Note that a perforated cylinder 17 or the like may be attached to the lower end of the pipe to prevent the pipe from being blocked by earth and sand. The upper end of the pipe should protrude above the backfilled contaminated soil. A pump 18 is connected to the pipe 16,
The water pumped up by the pump 18 is made to flow into a separately installed water treatment tank 19.
【０００８】上記のように準備したのち、汚染土壌の浄
化処理は次のように行う。まず汚染土壌の上から洗浄水
を散布する。これにより、洗浄水は汚染土壌中に浸透し
、汚染土壌中の有害物を溶解して下方に流下してシート
１２上に溜まる。洗浄水は連続的もしくは適宜間欠的に
供給するようにする。洗浄水がシート１２上に溜まる状
態になったらポンプ１８を作動させ、洗浄水をパイプ１
６を通じて汲み上げて水処理槽１９に流入させる。水処
理槽１９では公知の方法により水処理を行って洗浄水中
の有害物を除去する。有害物を除去された洗浄水は水処
理槽１９から再度汚染土壌上に散布され、以後これを繰
り返すのである。このようにして汚染土壌中の有害物は
洗浄水に溶解し、水処理槽１９で取り除かれるので次第
に減少し、汚染土壌の洗浄が行える。この処理期間は土
壌の汚染度によって相違するが、概ね１〜２週間程度で
洗浄を完了させることができる。有害物を除去した水は
そのまま排出してもよいが、水を大量に使用することに
なるので、上記のように循環使用するのがよい。また上
記の例では、穴１０の内壁を隔壁１４で覆ったが、穴１
０を汚染地を含んで広い範囲に形成するようにすれば、
穴１０の内壁は必ずしも隔壁で覆わなくとも、有害物が
溶けこんだ洗浄水が外部に浸透するおそれはない。
この実施例によって除去できる有害物は水に溶解する物
質であり、シアン、６価クロム、鉛、カドミウム、水銀
、ヒ素、フッ素、銅、亜鉛などの各化合物もしくは単体
のほとんどの有害物の除去が行える。After preparing as described above, the contaminated soil is purified as follows. First, wash water is sprayed over the contaminated soil. As a result, the cleaning water permeates into the contaminated soil, dissolves harmful substances in the contaminated soil, flows downward, and accumulates on the sheet 12. The washing water is supplied continuously or intermittently as appropriate. When the cleaning water accumulates on the sheet 12, the pump 18 is activated and the cleaning water is transferred to the pipe 1.
6 and flows into the water treatment tank 19. In the water treatment tank 19, water is treated by a known method to remove harmful substances from the washing water. The cleaning water from which harmful substances have been removed is sprayed again onto the contaminated soil from the water treatment tank 19, and this process is repeated thereafter. In this way, harmful substances in the contaminated soil are dissolved in the washing water and removed in the water treatment tank 19, so that they are gradually reduced and the contaminated soil can be washed. Although the period of this treatment varies depending on the degree of soil contamination, cleaning can be completed in about 1 to 2 weeks. The water from which harmful substances have been removed may be discharged as is, but since a large amount of water will be used, it is better to recycle it as described above. Further, in the above example, the inner wall of the hole 10 is covered with the partition wall 14, but the hole 1
If 0 is formed over a wide area including contaminated areas,
Even if the inner wall of the hole 10 is not necessarily covered with a partition, there is no risk that the cleaning water containing harmful substances will penetrate to the outside. The harmful substances that can be removed by this example are substances that dissolve in water, and most of the harmful substances such as cyanide, hexavalent chromium, lead, cadmium, mercury, arsenic, fluorine, copper, and zinc, or single substances, can be removed. I can do it.
【０００９】図５は他の実施例を示す。本実施例は地下
水が高い場合の例を示す。地下水が高い場合に上記実施
例のように穴を掘ると地下水が上がってしまうので、こ
の実施例では穴を掘らず、直接汚染地を囲んで鋼矢板１
５を地中に打ち込み、隔壁１４を形成する。この場合、
隔壁１４の下端は地下水下方の地中にまで進入するよう
にし、この隔壁１４により汚染地と非汚染地の間で地下
水を仕切るようにする。隔壁１４で囲まれた汚染土壌中
に洗浄水汲み上げ用のパイプ１６を挿入し、パイプ１６
の下端が地下水中に位置するようにする。パイプ１６に
は上記と同様にポンプ１８を接続し、さらに水処理槽１
９と接続する。FIG. 5 shows another embodiment. This example shows an example where groundwater is high. If groundwater is high, digging a hole as in the above example would cause the groundwater to rise, so in this example, instead of digging a hole, steel sheet piles 1 were built directly around the contaminated area.
5 is driven into the ground to form the partition wall 14. in this case,
The lower end of the partition wall 14 penetrates into the ground below the groundwater, and the partition wall 14 partitions the groundwater between a contaminated area and a non-contaminated area. A pipe 16 for pumping up washing water is inserted into the contaminated soil surrounded by the partition wall 14, and the pipe 16
so that the lower end of the is located in the groundwater. The pump 18 is connected to the pipe 16 in the same manner as above, and the water treatment tank 1 is also connected to the pipe 16.
Connect with 9.
【００１０】上記のように準備して、次のように浄化処
理をする。すなわちポンプ１８を作動して地下水を汲み
上げ、水浄化槽１９に流入して公知の方法により有害物
の除去処理をする。有害物が除去された水を洗浄水とし
て汚染土壌上に散布し、汚染土壌中に浸透させ、有害物
を溶解させて地下水中に流下させるのである。この処理
を連続的に所定の期間繰り返して行うことにより、汚染
土壌中の有害物を徐々に除去でき、浄化が行える。地下
水は隔壁１４により仕切られているので、有害物をふく
む洗浄水が隔壁１４外の地下水中にはほとんど流入する
ことがなく、効率よく浄化処理が行える。なお地下水の
みでは洗浄水が不足するときは、外部から洗浄水を追加
供給するようにする。以上本発明につき好適な実施例を
挙げて種々説明したが、本発明はこの実施例に限定され
るものではなく、発明の精神を逸脱しない範囲内で多く
の改変を施し得るのはもちろんである。[0010] After preparation as described above, purification treatment is carried out as follows. That is, the pump 18 is activated to pump up groundwater, which flows into the water purification tank 19 where harmful substances are removed by a known method. The water from which harmful substances have been removed is used as washing water and is sprayed over the contaminated soil, allowing it to penetrate into the contaminated soil, dissolving the harmful substances, and allowing them to flow down into the groundwater. By continuously repeating this process for a predetermined period of time, harmful substances in the contaminated soil can be gradually removed and purification can be achieved. Since the underground water is partitioned by the partition wall 14, the cleaning water containing harmful substances hardly flows into the ground water outside the partition wall 14, and the purification process can be carried out efficiently. If there is insufficient washing water from groundwater alone, additional washing water will be supplied from outside. Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. .
【００１１】[0011]
【発明の効果】以上のように、本発明によれば汚染地の
現場で汚染土壌の洗浄が行えるので、従来のように排土
、客土の運搬を行う必要がなく、労力、コストの大幅な
削減を図れる。また有害物は濃縮して除去されるから、
その運搬や処理は容易であり、無害化処理をして埋め立
てるにしても、溶出による二次公害の発生を極力防止で
きる。[Effects of the Invention] As described above, according to the present invention, contaminated soil can be washed on site in a contaminated area, so there is no need to remove soil or transport soil as in the past, which significantly reduces labor and cost. It is possible to achieve significant reductions. In addition, harmful substances are concentrated and removed,
It is easy to transport and dispose of, and even if it is detoxified and landfilled, secondary pollution due to elution can be prevented as much as possible.
【図１】汚染地の汚染土壌を掘り上げて穴を形成した状
態の説明図である。FIG. 1 is an explanatory diagram of a state in which a hole is formed by digging up contaminated soil in a contaminated area.
【図２】穴内にシートを敷いた状態の説明図である。FIG. 2 is an explanatory diagram of a state in which a sheet is spread in a hole.
【図３】鋼矢板の接続状態を示す説明図である。FIG. 3 is an explanatory diagram showing a connected state of steel sheet piles.
【図４】汚染土壌を埋め戻して洗浄処理を行う説明図で
ある。FIG. 4 is an explanatory diagram of backfilling contaminated soil and cleaning treatment.
【図５】他の実施例を示す説明図である。FIG. 5 is an explanatory diagram showing another embodiment.
１０ 穴 １２ シート １３ 内壁 １４ 隔壁 １５ 鋼矢板 １６ パイプ １８ ポンプ １９ 水処理槽 10 holes 12 Sheets 13 Inner wall 14 Partition wall 15 Steel sheet piles 16 Pipe 18 Pump 19 Water treatment tank
Claims (2)
げ、該穴の少なくとも底面を覆ってシートを敷き、穴内
に水汲み上げ用のパイプを配設し、穴内に前記掘り上げ
た汚染土壌を埋め戻すと共に、該埋め戻した汚染土壌に
洗浄水を浸透させて汚染土壌中の有害物を洗浄水中に溶
解させ、前記シート上にたまった有害物を含む洗浄水を
前記パイプを通じて汲み上げ、汲み上げた洗浄水中から
有害物を除去する操作を繰り返すことを特徴とする汚染
地の浄化方法。Claim 1: Dig a hole in the contaminated land, dig up the contaminated soil, spread a sheet to cover at least the bottom of the hole, arrange a pipe for pumping up water in the hole, and remove the contaminated soil dug up in the hole. At the same time, washing water is infiltrated into the backfilled contaminated soil to dissolve harmful substances in the contaminated soil in the washing water, and the washing water containing harmful substances accumulated on the sheet is pumped up through the pipe. A method for purifying a contaminated area, characterized by repeating an operation to remove harmful substances from washed water.
を下端が地下水よりも下方の地中に進入するよう打ち込
み、該隔壁に囲まれた汚染土壌中に、下端が地下水中に
位置するように水汲み上げ用のパイプを配設すると共に
、該パイプを通じて地下水を汲み上げ、汲み上げた水か
ら有害物を除去する処理を行い、該有害物を除去した水
を洗浄水として汚染土壌中に浸透させて汚染土壌中の有
害物を溶解させて地下水中に流下させる処理を繰り返す
ことを特徴とする汚染地の浄化方法。Claim 2: A partition wall is driven into the ground to enclose contaminated soil in a contaminated area so that its lower end penetrates into the ground below the groundwater, and the lower end is located in the groundwater in the contaminated soil surrounded by the partition wall. In addition to arranging water pumping pipes, underground water is pumped up through the pipes, and the pumped water is treated to remove harmful substances, and the water from which the harmful substances have been removed is used as washing water and permeates into the contaminated soil. A method for purifying contaminated land, characterized by repeating a process of dissolving harmful substances in contaminated soil and flowing it into groundwater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2416105A JPH04225886A (en) | 1990-12-27 | 1990-12-27 | Method for decontaminating contaminated area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2416105A JPH04225886A (en) | 1990-12-27 | 1990-12-27 | Method for decontaminating contaminated area |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04225886A true JPH04225886A (en) | 1992-08-14 |
Family
ID=18524349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2416105A Pending JPH04225886A (en) | 1990-12-27 | 1990-12-27 | Method for decontaminating contaminated area |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04225886A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004057953A (en) * | 2002-07-30 | 2004-02-26 | Okumura Corp | Decontamination method of contaminated soil at original position |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5245153A (en) * | 1976-02-20 | 1977-04-09 | Hiroshi Nishii | Method of treatment of areas contaminated with hexa-valent chromium |
| JPS5835234A (en) * | 1981-08-25 | 1983-03-01 | Nippon Steel Corp | Operating method of generating equipment for recovering top pressure of blast furnace |
-
1990
- 1990-12-27 JP JP2416105A patent/JPH04225886A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5245153A (en) * | 1976-02-20 | 1977-04-09 | Hiroshi Nishii | Method of treatment of areas contaminated with hexa-valent chromium |
| JPS5835234A (en) * | 1981-08-25 | 1983-03-01 | Nippon Steel Corp | Operating method of generating equipment for recovering top pressure of blast furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004057953A (en) * | 2002-07-30 | 2004-02-26 | Okumura Corp | Decontamination method of contaminated soil at original position |
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