JPH0994558A - Recovery device for contaminant in ground - Google Patents
Recovery device for contaminant in groundInfo
- Publication number
- JPH0994558A JPH0994558A JP7254200A JP25420095A JPH0994558A JP H0994558 A JPH0994558 A JP H0994558A JP 7254200 A JP7254200 A JP 7254200A JP 25420095 A JP25420095 A JP 25420095A JP H0994558 A JPH0994558 A JP H0994558A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- ground
- injection well
- well
- gas injection
- 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
- 238000011084 recovery Methods 0.000 title claims description 6
- 239000000356 contaminant Substances 0.000 title abstract description 6
- 239000007789 gas Substances 0.000 claims abstract description 126
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000001301 oxygen Substances 0.000 claims abstract description 17
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 17
- 238000009423 ventilation Methods 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims description 46
- 239000007924 injection Substances 0.000 claims description 46
- 239000003344 environmental pollutant Substances 0.000 claims description 32
- 231100000719 pollutant Toxicity 0.000 claims description 32
- 238000000605 extraction Methods 0.000 claims description 24
- 238000007789 sealing Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 239000003673 groundwater Substances 0.000 abstract description 7
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 6
- 238000001556 precipitation Methods 0.000 abstract description 3
- 230000035515 penetration Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 12
- 239000002689 soil Substances 0.000 description 10
- 238000005273 aeration Methods 0.000 description 9
- 241001148470 aerobic bacillus Species 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000006386 neutralization reaction Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000003621 irrigation water Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、地中の通気帯また
は帯水層から揮発性汚染物質を回収・除去するための方
法、およびこの方法に使用される装置に関する。TECHNICAL FIELD The present invention relates to a method for recovering and removing volatile pollutants from an aeration zone or an aquifer in the ground, and an apparatus used for the method.
【０００２】[0002]
【従来の技術】揮発性物質の流出と浸透による土壌およ
び地下水の汚染は、飲料水や灌漑用水等を得る上で大き
な問題となっている。そこで、地中の、特に上層部から
汚染物質を除去するため、従来より例えば以下のような
方法が使用されている。2. Description of the Related Art Contamination of soil and groundwater due to outflow and infiltration of volatile substances has been a serious problem in obtaining drinking water, irrigation water and the like. Therefore, in order to remove pollutants from the ground, especially from the upper layer, the following methods have been conventionally used.
【０００３】このうち、最も一般的な方法は、（１）汚
染土壌全体を除去し、汚染されていない土壌を客土する
方法である。また、（２）土壌から地下水へ汚染物質を
浸出させ、この地下水を汚染帯域の地中に形成された水
除去井戸からポンプを用いて汲み上げ、汚染物質を回収
する方法もある。更に、（３）汚染帯域の地中に形成さ
れた複数の気体抽出井戸によって空気とともに地中の汚
染物質を地中から吸引回収する方法も考案されている。Of these, the most general method is (1) a method of removing the entire contaminated soil and applying uncontaminated soil to the soil. In addition, (2) there is also a method of leaching a pollutant from soil to groundwater, and pumping this groundwater from a water removal well formed in the ground of the polluted zone using a pump to recover the pollutant. Further, (3) a method has been devised in which a plurality of gas extraction wells formed in the ground in the polluted zone are used to suck and collect the pollutants in the ground together with the air.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記従
来の方法のうち、（１）の方法は比較的単純な方法では
あるが、大量の土壌を交換するには膨大な費用と時間を
要するという問題があった。また、（２）の方法では、
汚染物質には難水溶性を示すものが多く、必ずしも地下
水に浸出するとは限らないため、汚染物質の完全な回収
には費用と時間を要するという問題があった。However, among the above-mentioned conventional methods, the method (1) is a relatively simple method, but it takes a huge amount of money and time to replace a large amount of soil. was there. Moreover, in the method of (2),
Since many pollutants are poorly water-soluble and do not always leach into groundwater, there has been a problem that complete recovery of pollutants requires cost and time.
【０００５】一方、（３）の方法では、気体抽出井戸内
の負圧により地下水面が上昇して浄化空気の流通範囲を
狭め、結果的に浄化効率が低下する可能性があった。ま
た、帯水層中に汚染物質が存在する場合には、吸引のみ
では浄化空気を流通させることができなかった。On the other hand, in the method (3), there is a possibility that the negative pressure in the gas extraction well raises the water table to narrow the flow range of the purified air, resulting in a reduction in the purification efficiency. Further, when pollutants are present in the aquifer, the purified air cannot be circulated by only suction.
【０００６】更に、帯水層中に空気を注入する技術を考
えた場合、鉄やマンガン等の重金属が酸化物あるいは水
酸化物として沈澱し、帯水層の地下水流や浄化のための
空気流を阻害する可能性があった。特に、降雨の多い場
所あるいは季節の場合、降雨に伴う水分が地中に浸透し
て空気流路を閉塞し、空気の注入または吸引を妨害する
可能性があった。また、汚染帯域が地表から浅い場合、
あるいは、ある程度深くても、地表との間に通気性の低
い層がない場合には、注入した空気が地表との間で短絡
し、その結果、汚染帯域を通過する空気量が減少すると
いう問題もあった。Further, when considering the technique of injecting air into the aquifer, heavy metals such as iron and manganese precipitate as oxides or hydroxides, and the groundwater flow of the aquifer and the air flow for purification are obtained. Could be blocked. In particular, in a place with a lot of rainfall or in a season, water associated with rainfall may penetrate into the ground to block the air flow path and hinder the injection or suction of air. Also, if the pollution zone is shallow from the surface,
Alternatively, even if it is deep to some extent, if there is no layer with low air permeability to the ground surface, the injected air will short-circuit with the ground surface, resulting in a reduction in the amount of air passing through the contaminated zone. There was also.
【０００７】[0007]
【課題を解決するための手段】本発明は、上記事情に鑑
みてなされたもので、汚染帯域の地中に形成された気体
注入井戸と、この気体注入井戸から上方に延びる第一の
管路と、この第一の管路を介して前記気体注入井戸に気
体を供給する第一のポンプと、前記気体注入井戸の周囲
の地中に形成された気体抽出井戸と、この気体抽出井戸
から上方に延びる第二の管路と、この第二の管路を介し
て前記気体抽出井戸から前記気体を吸引する第二のポン
プとを具備する地中の汚染物質の回収装置において、前
記気体注入井戸から地中の通気帯に前記気体を供給し、
かつ／または他の気体注入井戸から地中の帯水層に前記
気体を供給するとともに、前記気体抽出井戸が前記通気
帯から前記気体とともに地中の汚染物質を吸引すること
をその特徴とするものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a gas injection well formed in the ground of a contaminated zone and a first conduit extending upward from the gas injection well. A first pump for supplying a gas to the gas injection well through the first pipeline, a gas extraction well formed in the ground around the gas injection well, and an upper part of the gas extraction well. In the device for recovering underground pollutants, comprising: a second pipeline extending to the above; and a second pump for sucking the gas from the gas extraction well through the second pipeline, the gas injection well To supply the gas to the ventilation zone in the ground,
And / or supplying the gas to the aquifer in the ground from another gas injection well, and the gas extraction well sucks pollutants in the ground together with the gas from the aeration zone. Is.
【０００８】この場合、前記汚染帯域の地表をその全域
にわたりシール手段で覆い、地中と大気との間における
物質の移動をこのシール手段により防止しつつ地中の汚
染物質を回収することが望ましい。また、前記他の気体
注入井戸から地中の帯水層に前記気体を供給する場合に
は、帯水層中における重金属イオン濃度に応じ、供給す
る前記気体中の酸素分圧を分離器等により低下させても
よい。更に、前記分離器等により分離した酸素を、前記
気体注入井戸を介して地中の通気帯に供給してもよい。In this case, it is desirable to cover the entire surface of the polluted zone with a sealing means so as to prevent the movement of the substance between the ground and the atmosphere by the sealing means and recover the pollutant in the ground. . When the gas is supplied from the other gas injection well to the aquifer in the ground, the oxygen partial pressure in the gas to be supplied is separated by a separator or the like according to the concentration of heavy metal ions in the aquifer. It may be lowered. Further, the oxygen separated by the separator or the like may be supplied to the ventilation zone in the ground through the gas injection well.
【０００９】一方、前記第二の管路に、前記気体ととも
に吸引した前記汚染物質を無毒化する中和手段を設けて
もよい。この場合、前記中和手段を前記気体注入井戸に
連結し、前記中和手段から排出された前記気体を前記気
体注入井戸または他の気体注入井戸から再度地中に供給
することも可能である。On the other hand, a neutralizing means for detoxifying the pollutants sucked together with the gas may be provided in the second conduit. In this case, it is possible to connect the neutralization means to the gas injection well and supply the gas discharged from the neutralization means to the ground again from the gas injection well or another gas injection well.
【００１０】[0010]
【発明の実施の形態】以下、図面に基づき、本発明の実
施の形態について説明する。図１において、符号１，
２，３は、それぞれ気体注入井戸、気体抽出井戸、およ
び気体スパージング井戸（第二の気体注入井戸）であ
る。これらの井戸１，２，３は、地表から地中に穿孔さ
れたボーリング穴４，５，６と、ボーリング穴４，５，
６内にそれぞれ同軸をなすよう設置された導管７，８，
９と、導管７，８，９の下端部周辺に充填された透水充
填物１０およびその上方に充填された不透水充填物１１
とから概略構成されている。Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1
Reference numerals 2 and 3 denote a gas injection well, a gas extraction well, and a gas sparging well (second gas injection well), respectively. These wells 1, 2 and 3 are boreholes 4,5 and 6 drilled from the surface to the ground, and boreholes 4,5 and 6.
Conduits 7, 8 installed coaxially in 6 respectively
9, a water-permeable packing 10 filled around the lower ends of the conduits 7, 8, 9 and a water-impermeable packing 11 filled above the water-permeable packing 10.
It is schematically composed of
【００１１】ここで、気体注入井戸１のボーリング穴４
および気体抽出井戸２のボーリング穴５は、いずれも下
端が帯水層１２上方の通気帯１３に到達している。一
方、気体スパージング井戸３のボーリング穴６の下端は
帯水層１２に到達し、かつ導管９の下端も、帯水層１２
中まで延設されている。また、符号１ａ，２ａ，３ａ
は、それぞれ井戸１，２，３の上端を閉鎖する蓋であ
る。Here, the boring hole 4 of the gas injection well 1
The lower end of each of the boring holes 5 of the gas extraction well 2 reaches the ventilation zone 13 above the aquifer 12. On the other hand, the lower end of the boring hole 6 of the gas sparging well 3 reaches the aquifer 12, and the lower end of the conduit 9 also reaches the aquifer 12.
It has been extended to the inside. Further, reference numerals 1a, 2a, 3a
Are lids that close the upper ends of the wells 1, 2, and 3, respectively.
【００１２】導管７，８，９の上端はいずれも蓋１ａ，
２ａ，３ａから上方に突出し、かつこれら上端には、そ
れぞれ管路（第一の管路〜第三の管路）１４，１５，１
６の一端が連結されている。また、これら管路１４，１
５，１６の他端はいずれも大気中に開放されるととも
に、管路１４，１５，１６中には、ポンプ（第一のポン
プ〜第三のポンプ）１７，１８，１９がそれぞれ設置さ
れている。ここで、ポンプ１７，１９はいずれも気体を
管路１４，１６の他端側から導管７，９に送り込むよう
設置され、かつポンプ１８は、気体を導管８から管路１
５の他端側に吸引するよう設置されている。The upper ends of the conduits 7, 8 and 9 are all lids 1a,
2a and 3a project upward, and pipe lines (first to third pipe lines) 14, 15 and 1 are provided at their upper ends, respectively.
One end of 6 is connected. Also, these pipelines 14, 1
The other ends of 5, 5 are open to the atmosphere, and pumps (first pump to third pump) 17, 18, 19 are installed in the pipelines 14, 15, 16, respectively. There is. Here, the pumps 17 and 19 are both installed so as to send gas from the other ends of the conduits 14 and 16 to the conduits 7 and 9, and the pump 18 supplies gas from the conduit 8 to the conduit 1.
It is installed on the other end side of 5 so as to suck.
【００１３】更に、管路１６中のポンプ１９下流側に
は、分離器２０が設置されている。この分離器２０は、
大気中に存在する酸素の大半を濾過、除去し、窒素その
他酸素以外の成分を通過させるものである。また、管路
１５中のポンプ１８下流側には、中和器２１が設置され
ている。この中和器２は、活性炭床または熱バーナー等
を具備し、管路１５内の気体とともに送られてきた汚染
物質を中和あるいは分解するものである。Further, a separator 20 is installed downstream of the pump 19 in the conduit 16. This separator 20
Most of the oxygen present in the atmosphere is filtered and removed, and nitrogen and other components other than oxygen are passed through. A neutralizer 21 is installed downstream of the pump 18 in the pipe 15. The neutralizer 2 is equipped with an activated carbon bed, a heat burner or the like, and neutralizes or decomposes pollutants sent together with the gas in the pipe 15.
【００１４】符号２２は、汚染帯域の地表をその全域に
わたって覆い、地中と大気との間における物質の移動を
防止するシール手段である、シール手段２２には、地中
と大気との間における物質の移動を阻止するものであれ
ばあらゆる公知のものが使用可能である。具体的には、
シート状物品の他、例えばアスファルトのような舗装材
等が使用可能である。本例の場合、シール手段２２とし
ては、汚染帯域の地表を、ポリエチレン製シートにて継
目が約１ｍ程度重なるよう覆った後、このシートの表面
に、汚染されていない土を５０ｃｍ程度の厚さでかぶ
せ、踏み固めたものが使用されている。Reference numeral 22 is a sealing means for covering the entire surface of the polluted zone over its entire surface and preventing the movement of substances between the ground and the atmosphere. The sealing means 22 is provided between the ground and the atmosphere. Any known material can be used as long as it blocks the movement of substances. In particular,
In addition to the sheet-like article, a pavement material such as asphalt can be used. In the case of this example, as the sealing means 22, the surface of the contaminated zone is covered with a polyethylene sheet so that the seams overlap with each other by about 1 m, and then the surface of the sheet is covered with uncontaminated soil with a thickness of about 50 cm. It is covered and squeezed.
【００１５】そして、上記した井戸１，２，３、管路１
４，１５，１６、ポンプ１７，１８，１９、分離器２
０、中和器２１、およびシール手段２２の各部材から、
地中の汚染物質の回収装置２３が概略構成されている。Then, the wells 1, 2, 3 and the pipeline 1 described above.
4,15,16, pumps 17,18,19, separator 2
0, the neutralizer 21, and the sealing means 22
A device 23 for collecting underground pollutants is roughly configured.
【００１６】次に、上記装置２３を用いた本発明の地中
の汚染物質の回収方法を説明する。ポンプ１７，１８，
１９を作動させると、ポンプ１７，１９により、管路１
４，１６の他端から空気（気体）が導管７，９に送り込
まれ、導管７，９の下端から透水充填物１０内に供給さ
れる。一方、ポンプ１８により、導管８の下端部周辺の
気体が管路１５の他端側に吸引され、井戸２の下端部周
辺に負圧部分が形成される。Next, a method of recovering contaminants in the ground according to the present invention using the device 23 will be described. Pumps 17, 18,
When 19 is activated, the pumps 17 and 19 cause the pipeline 1
Air (gas) is sent into the conduits 7 and 9 from the other ends of the conduits 4 and 16, and is supplied into the water-permeable packing 10 from the lower ends of the conduits 7 and 9. On the other hand, the gas around the lower end of the conduit 8 is sucked into the other end of the conduit 15 by the pump 18, and a negative pressure portion is formed around the lower end of the well 2.
【００１７】その結果、汚染帯域の地中に井戸１，３の
下端部から井戸２の下端部との間に、井戸１，３から井
戸２に至る空気の流れが形成されるとともに、地中の汚
染物質がこの空気との接触により揮発、混入する。汚染
物質が混入した空気は管路１５の一端側から吸引されて
中和器２１に至り、中和器２１における中和または分解
により無毒化された後、大気中に還元されるか、あるい
は土壌中に再注入される。As a result, an air flow from the wells 1 and 3 to the well 2 is formed between the lower ends of the wells 1 and 3 and the lower end of the well 2 in the soil of the contaminated zone, and The pollutant of volatilizes and mixes by contact with this air. The air mixed with pollutants is sucked from one end of the pipeline 15 to reach the neutralizer 21, is detoxified by neutralization or decomposition in the neutralizer 21, and is then returned to the atmosphere or soil. Re-injected into.
【００１８】特に、本発明では、通気帯１３に気体注入
井戸１を設けることにより、浄化気体流通のために必要
とされる圧力勾配が気体抽出井戸２と気体注入井戸１と
の間で分担されるため、気体抽出井戸２周辺の負圧が低
水準に抑えられる。従って、地下水面の上昇と、それに
伴う気体流路の閉塞を低水準に抑えることができる。In particular, in the present invention, by providing the gas injection well 1 in the ventilation zone 13, the pressure gradient required for circulating the purified gas is shared between the gas extraction well 2 and the gas injection well 1. Therefore, the negative pressure around the gas extraction well 2 is suppressed to a low level. Therefore, the rise of the water table and the resulting clogging of the gas flow path can be suppressed to a low level.
【００１９】また、井戸３から帯水層１２に供給される
空気中の酸素量を分離器２０を用いて低下させることに
より、帯水層１２に実質的に酸素を含有しない空気が供
給される。その結果、帯水層１２が嫌気状態となり、帯
水層１２における重金属の沈澱生成が防止される。Further, by reducing the amount of oxygen in the air supplied from the well 3 to the aquifer 12 by using the separator 20, the aquifer 12 is supplied with air containing substantially no oxygen. . As a result, the aquifer 12 is in an anaerobic state, and the precipitation of heavy metals in the aquifer 12 is prevented.
【００２０】一方、分離器２０と管路１４との間に新た
な管路２４を設け、分離器２０により分離した酸素を、
気体注入井戸１を介して通気帯１３に供給し、通気帯１
３を好気条件とすることにより、通気帯１３における好
気的細菌の繁殖と、これら好気的細菌による有害物質の
分解の促進を図ることも可能である。この場合、帯水層
１２に対する酸素供給量の低下および／または通気帯１
３に対する酸素供給量の増加程度は、帯水層１２中の重
金属イオン濃度と、対象とする有害物質を分解する主た
る微生物が好気的か嫌気的かによって決定する。On the other hand, a new pipe line 24 is provided between the separator 20 and the pipe line 14, and the oxygen separated by the separator 20 is
The gas is supplied to the ventilation zone 13 through the gas injection well 1, and the ventilation zone 1
By setting 3 as an aerobic condition, it is possible to promote the growth of aerobic bacteria in the aeration zone 13 and promote the decomposition of harmful substances by these aerobic bacteria. In this case, the oxygen supply to the aquifer 12 is reduced and / or the aeration zone 1 is
The degree of increase in the amount of oxygen supplied to No. 3 is determined by the concentration of heavy metal ions in the aquifer 12 and whether the main microorganism that decomposes the target harmful substance is aerobic or anaerobic.
【００２１】更に、本発明では、汚染帯域の地表をその
全域にわたりシール手段２２で覆ってから地中の汚染物
質を回収することにより、降雨に伴う水分の地中への浸
透と、それに伴う空気流路の閉塞が防止されている。そ
のため、降雨の多い場所あるいは季節であっても、降雨
による妨害を受けることなく、空気の流通による汚染物
質の除去が可能となっている。Further, according to the present invention, the surface of the polluted zone is covered with the sealing means 22 over the entire area thereof, and then the pollutants in the ground are collected. Blockage of the flow path is prevented. Therefore, even in a rainy place or season, it is possible to remove pollutants by air circulation without being disturbed by rain.
【００２２】また、シール手段２２の存在により、大気
から地中または地中から大気への空気の短絡と、それに
伴う汚染帯域における通過空気量の減少が防止される。
そのため、汚染帯域が地表から浅い場合、あるいは、地
表との間に通気性の低い層がない場合等でも、供給した
空気が地表との間で短絡することなく、十分な量の空気
の流通による汚染物質の除去が可能となっている。Further, the presence of the sealing means 22 prevents a short circuit of air from the atmosphere to the ground or from the ground to the atmosphere and a consequent reduction in the amount of air passing through in the polluted zone.
Therefore, even if the pollution zone is shallow from the surface of the earth, or even if there is no layer with low air permeability between the surface of the earth, the supplied air does not short-circuit with the surface of the earth, and a sufficient amount of air flows It is possible to remove pollutants.
【００２３】なお、上記の実施形態では、気体注入井戸
１、気体抽出井戸２、および気体スパージング井戸３が
各１基ずつ設けられているが、これらの配置は上記構成
に限られるものではなく、汚染帯域が広い場合には、そ
の設置数を多くし、あるいは、汚染帯域が狭く限られて
いるような場合には、その中心に気体注入井戸１と気体
スパージング井戸３とを設置し、その周囲に複数の気体
抽出井戸２を環状に設ける、もしくはその逆の配置とす
る等、汚染帯域の規模や回収条件等に応じて様々に変更
可能である。In the above embodiment, one gas injection well 1, one gas extraction well 2 and one gas sparging well 3 are provided, but the arrangement of these is not limited to the above configuration. When the pollution zone is wide, the number of installations is increased, or when the pollution zone is narrow and limited, the gas injection well 1 and the gas sparging well 3 are installed at the center of the well, and the surroundings are provided. A plurality of gas extraction wells 2 may be provided in a ring shape, or the opposite arrangement may be adopted, and various changes can be made according to the scale of the contamination zone, the recovery conditions, and the like.
【００２４】また、気体注入井戸１または気体スパージ
ング井戸３のいずれかのみを設置し、気体注入井戸１ま
たは気体スパージング井戸３のいずれかから気体抽出井
戸２へと空気を流通させる構成としてもよい。管路１５
の他端を管路１４，１６の少なくとも一方の他端に接続
して、装置２３と地中との間で空気を還流させる閉ルー
プを形成することももちろん可能である。Further, it is also possible to install either the gas injection well 1 or the gas sparging well 3 and allow the air to flow from either the gas injection well 1 or the gas sparging well 3 to the gas extraction well 2. Pipeline 15
It is of course possible to connect the other end of the pipe to at least one of the ends of the conduits 14 and 16 to form a closed loop for circulating air between the device 23 and the ground.
【００２５】一方、上記の実施形態では、地中に流通さ
せる気体として空気を使用したが、この気体は単なる空
気に限られるものではなく、加熱空気、蒸気、メタンガ
ス等でもよく、空気に蒸気やメタンガス等を混入したも
のであってもよい。On the other hand, in the above embodiment, air was used as the gas to be circulated in the ground, but this gas is not limited to mere air, and may be heated air, steam, methane gas, etc. It may be a mixture of methane gas and the like.
【００２６】[0026]
【発明の効果】以上説明したように、本発明において
は、地中に気体を流通させて汚染物質を回収するにあた
り、気体注入井戸から地中の通気帯に気体を供給し、か
つ／または、他の気体注入井戸から地中の帯水層に前記
気体を供給している。すなわち、通気帯に気体注入井戸
を設け、浄化気体流通のために必要とされる圧力勾配を
気体抽出井戸と気体注入井戸との間で分担することによ
り、気体抽出井戸内の負圧が低水準に抑えられ、その結
果、地下水面の上昇と、それに伴う気体流路の閉塞を、
低水準に抑えることが可能となる。As described above, in the present invention, when the gas is circulated in the ground to recover the pollutant, the gas is supplied from the gas injection well to the ventilation zone in the ground, and / or The gas is supplied to the aquifer in the ground from another gas injection well. That is, by providing a gas injection well in the aeration zone and sharing the pressure gradient required for flowing purified gas between the gas extraction well and the gas injection well, the negative pressure in the gas extraction well is at a low level. As a result, the rise of the water table and the accompanying blockage of the gas flow path,
It is possible to keep it at a low level.
【００２７】また、帯水層に他の気体注入井戸を設け、
帯水層中の汚染物質を空気と接触させることにより、帯
水層中の汚染物質を通気帯にまで運び上げて抽出井戸か
ら除去するか、あるいは微生物作用によるその場での分
解を促進することが可能である。なお、これらの作用
は、地下水中に溶存した汚染物質はもちろん、帯水層を
構成する土壌に吸着した汚染物質に対しても有効であ
る。Further, another gas injection well is provided in the aquifer,
Contacting pollutants in aquifers with air to carry pollutants in aquifers to the aeration zone for removal from extraction wells or to promote in situ degradation by microbial action. Is possible. Note that these actions are effective not only for pollutants dissolved in groundwater but also for pollutants adsorbed to the soil forming the aquifer.
【００２８】特に、他の気体注入井戸から地中の帯水層
に気体を供給する場合、供給される気体中の酸素分圧を
分離器等を用いて低下させ、帯水層を嫌気条件とするこ
とにより、帯水層における重金属の沈澱生成が防止され
る。この場合、分離器等により分離した酸素を前記気体
注入井戸を介して通気帯に供給し、通気帯を好気条件と
することにより、通気層における好気的細菌の繁殖と、
これら好気的細菌による汚染物質の分解が促進されると
いう効果もある。In particular, when a gas is supplied from another gas injection well to the aquifer in the ground, the partial pressure of oxygen in the supplied gas is reduced by using a separator or the like to make the aquifer anaerobic. By doing so, precipitation of heavy metals in the aquifer is prevented. In this case, oxygen separated by a separator or the like is supplied to the aeration zone through the gas injection well, and by making the aeration zone aerobic, the propagation of aerobic bacteria in the aeration layer,
There is also an effect that the decomposition of pollutants by these aerobic bacteria is promoted.
【００２９】更に、汚染帯域の地表をその全域にわたり
シール手段で覆ってから地中の汚染物質を回収している
ため、降雨に伴う水分の地中への浸透と、それに伴う気
体流路の閉塞が防止可能である。また、地中と大気との
間における前記気体の短絡と、それに伴う汚染帯域にお
ける気体通過量の減少も防止される。Furthermore, since the pollutants in the ground are collected after the entire surface of the polluted zone is covered with the sealing means, the permeation of water due to rainfall into the ground and the accompanying blockage of the gas flow path. Can be prevented. In addition, a short circuit of the gas between the ground and the atmosphere and a consequent reduction in the gas passage amount in the pollution zone are prevented.
【図１】本発明における気体注入井戸と気体スパージン
グ井戸、および気体抽出井戸の配置例を示す縦断面図で
ある。FIG. 1 is a vertical cross-sectional view showing an arrangement example of a gas injection well, a gas sparging well, and a gas extraction well according to the present invention.
１ 気体注入井戸 ２ 気体抽出井戸 ３ 気体スパージング井戸 １２ 透水層 １３ 通気帯 １４，１５，１６，２４ 管路 １７，１８，１９ ポンプ ２０ 分離器 ２１ 中和器 ２２ シール手段 ２３ 地中の汚染物質の回収装置 1 Gas injection well 2 Gas extraction well 3 Gas sparging well 12 Water permeable layer 13 Vent zone 14, 15, 16, 24 Pipe lines 17, 18, 19 Pump 20 Separator 21 Neutralizer 22 Sealing means 23 Contaminants in the ground Recovery device
Claims (7)
帯に気体を供給する気体注入井戸と、この気体注入井戸
から上方に延びる第一の管路と、この第一の管路を介し
て前記気体注入井戸に前記気体を供給する第一のポンプ
と、前記気体注入井戸の周囲の地中に形成され、前記通
気帯から前記気体を吸引する気体抽出井戸と、この気体
抽出井戸から上方に延びる第二の管路と、この第二の管
路を介して前記気体抽出井戸から前記気体を吸引する第
二のポンプとを具備することを特徴とする地中の汚染物
質の回収装置。1. A gas injection well formed in the ground of a polluted zone for supplying gas to a ventilation zone in the ground, a first pipeline extending upward from the gas injection well, and the first pipeline. A first pump for supplying the gas to the gas injection well via a gas extraction well formed in the ground around the gas injection well for sucking the gas from the ventilation zone; and the gas extraction well. From above, and a second pump for sucking the gas from the gas extraction well through the second pipe, the recovery of pollutants in the ground. apparatus.
層に気体を供給する気体注入井戸と、この気体注入井戸
から上方に延びる第一の管路と、この第一の管路を介し
て前記気体注入井戸に前記気体を供給する第一のポンプ
と、前記気体注入井戸の周囲の地中に形成され、前記通
気帯から前記気体を吸引する気体抽出井戸と、この気体
抽出井戸から上方に延びる第二の管路と、この第二の管
路を介して前記気体抽出井戸から前記気体を吸引する第
二のポンプとを具備することを特徴とする地中の汚染物
質の回収装置。2. A gas injection well formed in the ground of the polluted zone and supplying gas to the aquifer in the ground, a first conduit extending upward from the gas injection well, and the first pipe. A first pump for supplying the gas to the gas injection well via a passage, a gas extraction well formed in the ground around the gas injection well for sucking the gas from the ventilation zone, and the gas extraction A second pipeline extending upward from the well, and a second pump for sucking the gas from the gas extraction well via the second pipeline, Recovery device.
分離し、前記気体注入井戸に供給される前記気体中の酸
素分圧を低下させる分離器が設けられていることを特徴
とする請求項２記載の地中の汚染物質の回収装置。3. A separator for separating oxygen from the gas and reducing a partial pressure of oxygen in the gas supplied to the gas injection well is provided in the first conduit. The device for collecting underground pollutants according to claim 2.
に前記気体を供給する第二の気体注入井戸と、この第二
の気体注入井戸から上方に延びる第三の管路と、この第
三の管路を介して前記第二の気体注入井戸に前記気体を
供給する第三のポンプとを具備することを特徴とする請
求項１記載の地中の汚染物質の回収装置。4. A second gas injection well, which is formed in the ground of the polluted zone and supplies the gas to the aquifer, and a third pipe line extending upward from the second gas injection well. A third pump for supplying the gas to the second gas injection well via the third pipe, and a device for collecting underground pollutants according to claim 1.
井戸に供給される前記気体から酸素を分離し、前記第二
の注入井戸に供給される前記気体中の酸素分圧を低下さ
せる分離器が設けられていることを特徴とする請求項４
記載の地中の汚染物質の回収装置。5. The third pipeline separates oxygen from the gas supplied to the second gas injection well, and adjusts the oxygen partial pressure in the gas supplied to the second injection well. 5. A separator for reducing is provided.
The device for collecting underground pollutants described.
の管路を介して前記気体注入井戸に供給することを特徴
とする請求項５記載の地中の汚染物質の回収装置。6. The device for recovering underground pollutants according to claim 5, wherein the oxygen separated by the separator is supplied to the gas injection well via the first conduit.
り、地中と大気との間における物質の移動を防止するシ
ール手段で覆われていることを特徴とする請求項１，
２，３，４，５または６記載の地中の汚染物質の回収装
置。7. The surface of the contaminated zone is covered with sealing means for preventing the movement of substances between the ground and the atmosphere over the entire surface thereof.
The device for collecting underground pollutants according to 2, 3, 4, 5 or 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25420095A JP3406433B2 (en) | 1995-09-29 | 1995-09-29 | Underground pollutant recovery equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25420095A JP3406433B2 (en) | 1995-09-29 | 1995-09-29 | Underground pollutant recovery equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0994558A true JPH0994558A (en) | 1997-04-08 |
| JP3406433B2 JP3406433B2 (en) | 2003-05-12 |
Family
ID=17261648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25420095A Expired - Fee Related JP3406433B2 (en) | 1995-09-29 | 1995-09-29 | Underground pollutant recovery equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3406433B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002200480A (en) * | 2000-12-28 | 2002-07-16 | Shinichi Ueda | Soil decontamination process |
| JP2007181750A (en) * | 2006-01-04 | 2007-07-19 | Matsushita Electric Ind Co Ltd | System and method for cleaning underground water of gasoline station |
| JP2007253057A (en) * | 2006-03-23 | 2007-10-04 | Nippon Oil Corp | Method for recovering oil from oil-contaminated soil in situ |
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| JP2016036747A (en) * | 2014-08-05 | 2016-03-22 | 株式会社大林組 | Groundwater neutralization method and groundwater neutralization system |
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| CN102080519A (en) * | 2011-01-21 | 2011-06-01 | 中矿瑞杰(北京)科技有限公司 | Method for extracting coal bed gas by negative pressure on ground through gas-coal simultaneous extraction |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002200480A (en) * | 2000-12-28 | 2002-07-16 | Shinichi Ueda | Soil decontamination process |
| JP4636679B2 (en) * | 2000-12-28 | 2011-02-23 | 大阪瓦斯株式会社 | Soil purification method |
| JP2007181750A (en) * | 2006-01-04 | 2007-07-19 | Matsushita Electric Ind Co Ltd | System and method for cleaning underground water of gasoline station |
| JP4709010B2 (en) * | 2006-01-04 | 2011-06-22 | パナソニック株式会社 | Gas station groundwater purification system and purification method |
| JP2007253057A (en) * | 2006-03-23 | 2007-10-04 | Nippon Oil Corp | Method for recovering oil from oil-contaminated soil in situ |
| JP4672582B2 (en) * | 2006-03-23 | 2011-04-20 | Ｊｘ日鉱日石エネルギー株式会社 | In-situ oil recovery method for oil-contaminated soil |
| JP2014034028A (en) * | 2012-08-10 | 2014-02-24 | Kumagai Gumi Co Ltd | Polluted soil purifier |
| JP2014073426A (en) * | 2012-10-02 | 2014-04-24 | Ohbayashi Corp | Purification method of contaminated ground and purifier of contaminated ground |
| JP2016036747A (en) * | 2014-08-05 | 2016-03-22 | 株式会社大林組 | Groundwater neutralization method and groundwater neutralization system |
| KR101880197B1 (en) * | 2017-09-01 | 2018-07-20 | 고려대학교 세종산학협력단 | System and method for in situ removal of Hg from soil |
| KR102239436B1 (en) * | 2020-11-02 | 2021-04-13 | 주식회사 산하이앤씨 | A tube-well device for purification pollutant of underground |
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