JPH0576618A - Purification processing method of earth polluted with organic solvent and purification processing device - Google Patents
Purification processing method of earth polluted with organic solvent and purification processing deviceInfo
- Publication number
- JPH0576618A JPH0576618A JP3263233A JP26323391A JPH0576618A JP H0576618 A JPH0576618 A JP H0576618A JP 3263233 A JP3263233 A JP 3263233A JP 26323391 A JP26323391 A JP 26323391A JP H0576618 A JPH0576618 A JP H0576618A
- Authority
- JP
- Japan
- Prior art keywords
- organic solvent
- activated carbon
- solvent
- gas
- carbon fiber
- 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
- 239000003960 organic solvent Substances 0.000 title claims abstract description 144
- 238000000746 purification Methods 0.000 title claims description 15
- 238000012545 processing Methods 0.000 title description 3
- 238000003672 processing method Methods 0.000 title 1
- 239000002689 soil Substances 0.000 claims abstract description 68
- 238000001179 sorption measurement Methods 0.000 claims abstract description 60
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000002904 solvent Substances 0.000 claims abstract description 47
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000010438 heat treatment Methods 0.000 claims abstract description 40
- 238000011084 recovery Methods 0.000 claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000003463 adsorbent Substances 0.000 claims description 60
- 238000000034 method Methods 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 13
- 230000007246 mechanism Effects 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 2
- 239000011368 organic material Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 33
- 230000006378 damage Effects 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000000835 fiber Substances 0.000 abstract 2
- 238000007599 discharging Methods 0.000 abstract 1
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 8
- 238000005273 aeration Methods 0.000 description 6
- 238000012937 correction Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000003795 desorption Methods 0.000 description 5
- 239000003595 mist Substances 0.000 description 5
- 239000003673 groundwater Substances 0.000 description 4
- 229920000049 Carbon (fiber) Polymers 0.000 description 3
- 239000004917 carbon fiber Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- UOCLXMDMGBRAIB-UHFFFAOYSA-N 1,1,1-trichloroethane Chemical compound CC(Cl)(Cl)Cl UOCLXMDMGBRAIB-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 229920002239 polyacrylonitrile Polymers 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- UKDOTCFNLHHKOF-FGRDZWBJSA-N (z)-1-chloroprop-1-ene;(z)-1,2-dichloroethene Chemical group C\C=C/Cl.Cl\C=C/Cl UKDOTCFNLHHKOF-FGRDZWBJSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- CYTYCFOTNPOANT-UHFFFAOYSA-N Perchloroethylene Chemical group ClC(Cl)=C(Cl)Cl CYTYCFOTNPOANT-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036651 mood Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229950011008 tetrachloroethylene Drugs 0.000 description 1
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Fire-Extinguishing Compositions (AREA)
- Treating Waste Gases (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、機械工業、電子工業、
クリーニング業などの各種の産業において、脱脂や洗浄
剤として使用した後のトリクロロエチレン、１，１，１
−トリクロロエタン、テトラクロロエチレン、ｃｉｓ−
１，２−ジクロロエチレンなどの有機溶剤を含有した廃
液によって汚染された地下土壌を浄化する有機溶剤汚染
土壌の浄化処理方法および浄化処理装置に関する。BACKGROUND OF THE INVENTION The present invention relates to the mechanical industry, the electronic industry,
In various industries such as cleaning industry, trichloroethylene, 1,1,1 after degreasing and use as a cleaning agent
-Trichloroethane, tetrachloroethylene, cis-
The present invention relates to a method and apparatus for purifying soil contaminated with organic solvent, which purifies underground soil contaminated with a waste liquid containing an organic solvent such as 1,2-dichloroethylene.
【０００２】[0002]
【従来の技術】上述のような産業地域では、その敷地や
近辺の地下土壌が廃液によって汚染され、その廃液中の
有害物質である有機溶剤が、地下土壌の下部の帯水層に
染み込んでいき、帯水層を流れる地下水を汚染すること
になる。2. Description of the Related Art In industrial areas such as those mentioned above, underground soil around the site or in the vicinity is contaminated with waste liquid, and organic solvents, which are harmful substances in the waste liquid, permeate into the aquifer below the underground soil. , Will pollute the groundwater flowing through the aquifer.
【０００３】このような汚染土壌を浄化するために、従
来、汚染した土壌を掘り出して天日で乾燥したり熱を加
えるなどにより、含有されている有機溶剤を除去すると
か、あるいは、土壌中に水をかけたり水蒸気を注入した
りして、土壌中で固−液接触あるいは気−液接触させて
有機溶剤を脱離するとともに、その脱離した有機溶剤を
水や水蒸気などとともに排出するなどしていたが、手間
の割に浄化効率が低い不都合があった。In order to purify such contaminated soil, conventionally, the contaminated soil is dug out and dried in the sun, or heat is applied to remove the contained organic solvent, or the soil is removed from the soil. For example, by sprinkling water or injecting steam to make a solid-liquid contact or a gas-liquid contact in the soil to desorb the organic solvent, and to discharge the desorbed organic solvent together with water or steam. However, there was a problem that the purification efficiency was low for the trouble.
【０００４】そこで、従来では、図６のフローシートに
示すように、有機溶剤による汚染の可能性の有る地下土
壌Ｚ１中に、多数の通気孔を分散して形成した多孔管０
１を埋設するとともに、それらの多孔管０１…と真空ポ
ンプ０２とを開閉弁０３を介装した配管０４を介して接
続し、地下土壌中の有機溶剤を真空吸引により抽気して
効率良く除去し、地下土壌Ｚ１とその下方の不透水層Ｚ
２との間に形成される帯水層Ｚ３を流れる地下水の汚染
を防止するようにしている。[0004] Therefore, conventionally, as shown in the flow sheet of Fig. 6, a porous pipe 0 formed by dispersing a large number of vent holes in an underground soil Z1 which may be contaminated by an organic solvent.
1 is buried and the perforated pipes 01 ... And the vacuum pump 02 are connected via a pipe 04 having an opening / closing valve 03 interposed therebetween, and the organic solvent in the underground soil is evacuated by vacuum suction to be efficiently removed. , Underground soil Z1 and impermeable layer Z below it
The groundwater flowing through the aquifer Z3 formed between the groundwater and the water is prevented from being contaminated.
【０００５】更に、真空ポンプ０２にクーリングタワー
０５などの散気装置を接続し、抽気分中に混じっている
水分中の有機溶剤を曝気効果により除去して浄化し、そ
の浄化した水を放流するとともに除去された気体を大気
中に放出している。クーリングタワー０５は、内部に水
分供給用のノズル０６…と水分拡散用の波板０７と電動
モータ０８で駆動する送風ファン０９とを備え、ノズル
０６…から供給されるとともに波板０７で拡散されてい
る水分に空気を接触させ、水分中の有機溶剤を空気中に
移行して除去できるようになっている。Further, an air diffuser such as a cooling tower 05 is connected to the vacuum pump 02 to remove and purify the organic solvent in the water mixed in the extraction mood by the aeration effect, and the purified water is discharged. The removed gas is released into the atmosphere. The cooling tower 05 includes nozzles 06 for supplying water, a corrugated plate 07 for diffusing water, and a blower fan 09 driven by an electric motor 08, and is supplied from the nozzles 06 and diffused by the corrugated plate 07. Air is brought into contact with the existing water, and the organic solvent in the water can be transferred to the air and removed.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、従来例
の場合に、抽気した有機溶剤を大気中に放出しているた
め、大気汚染などの二次的な汚染やオゾン層の破壊とい
った地球的な環境破壊を発生する欠点があった。However, in the case of the conventional example, since the extracted organic solvent is released to the atmosphere, secondary pollution such as air pollution and destruction of the ozone layer in the global environment. There was a drawback of causing destruction.
【０００７】本発明は、このような事情に鑑みてなされ
たものであって、請求項１に係る発明の有機溶剤汚染土
壌の浄化処理方法は、地下土壌中の有機溶剤を大気中に
放出せずに吸着回収して環境破壊を防止できるようにす
ることを目的とし、請求項２に係る発明の有機溶剤汚染
土壌の浄化処理装置は、請求項１に係る排出の有機溶剤
汚染土壌の浄化処理方法を実施する上で、地下土壌中の
有機溶剤を効率良くかつ経済的に吸着回収できるように
することを目的とし、そして、請求項３に係る発明の有
機溶剤汚染土壌の浄化処理装置は、小型の溶剤回収装置
でもって、かつ、吸着材を交換せずに手間少なく有機溶
剤を吸着して回収できるようにすることを目的とし、ま
た、請求項４に係る発明の有機溶剤汚染土壌の浄化処理
装置は、有機溶剤の吸着を連続的に行うことができるよ
うにすることを目的とし、更に、請求項５に係る発明の
有機溶剤汚染土壌の浄化処理装置は、ランニングコスト
を極力低減しながら有機溶剤を良好に吸着できるように
することを目的とする。The present invention has been made in view of the above circumstances, and the method for purifying soil contaminated with organic solvent according to the first aspect of the present invention releases organic solvent in underground soil to the atmosphere. For the purpose of preventing the environmental damage by adsorbing and collecting the organic solvent-contaminated soil without purification, the apparatus for purification of organic-solvent-contaminated soil according to claim 2 is the purification treatment of the discharged organic solvent-contaminated soil according to claim 1. In carrying out the method, it is an object to enable efficient and economical adsorption and recovery of organic solvent in underground soil, and the purification treatment apparatus for organic solvent-contaminated soil according to the invention of claim 3 A small-sized solvent recovery device, which aims at adsorbing and recovering an organic solvent with little effort without exchanging the adsorbent, and purifying the organic solvent-contaminated soil of the invention according to claim 4. The processing equipment is an organic solvent The purification treatment apparatus for organic solvent-contaminated soil according to the invention of claim 5 is capable of adsorbing the organic solvent satisfactorily while reducing the running cost as much as possible. The purpose is to do so.
【０００８】[0008]
【課題を解決するための手段】そして、請求項１に係る
発明の有機溶剤汚染土壌の浄化処理方法は、上述のよう
な目的を達成するために、有機溶剤を含有する土壌中に
多孔管を埋設し、その多孔管を通して真空吸引装置によ
り有機溶剤を吸引し、吸引した有機溶剤含有ガスを活性
炭素材製吸着材に供給して有機溶剤を吸着処理する。In order to achieve the above-mentioned object, the method for purifying soil contaminated with organic solvent according to the first aspect of the present invention provides a porous pipe in soil containing organic solvent. The organic solvent is embedded and the organic solvent is sucked by a vacuum suction device through the perforated pipe, and the sucked organic solvent-containing gas is supplied to the activated carbon material adsorbent to adsorb the organic solvent.
【０００９】そして、請求項２に係る発明の有機溶剤汚
染土壌の浄化処理装置は、上述のような目的を達成する
ために、土壌中に埋設した多孔管に気液分離器を介して
真空吸引装置を接続するとともに、その真空吸引装置
に、有機溶剤含有ガスを供給して有機溶剤を活性炭素材
製吸着材に吸着する溶剤回収装置をガス配管を介して接
続し、かつ、ガス配管に、溶剤回収装置に供給される有
機溶剤含有ガスを加熱する加熱手段を設け、その加熱手
段で加熱された有機溶剤含有ガスの温度を測定する温度
センサを設けるとともに、温度センサで測定された温度
が設定範囲内に維持されるように加熱手段を作動する加
熱制御装置を備えて構成する。In order to achieve the above-mentioned object, the apparatus for purifying soil contaminated with organic solvent according to the second aspect of the present invention vacuum-sucks through a gas-liquid separator into a perforated pipe buried in the soil. Along with connecting the device, the vacuum suction device is connected via a gas pipe to a solvent recovery device that supplies an organic solvent-containing gas to adsorb the organic solvent to the activated carbon material adsorbent, and to the gas pipe, the solvent. A heating means for heating the organic solvent-containing gas supplied to the recovery device is provided, and a temperature sensor for measuring the temperature of the organic solvent-containing gas heated by the heating means is provided, and the temperature measured by the temperature sensor is within a set range. It comprises a heating control device which operates the heating means so as to be maintained inside.
【００１０】活性炭素材製吸着材を構成する活性炭素材
としては、粒状活性炭や活性炭素繊維が使用でき、そし
て、活性炭素繊維としては、ピッチ系、ポリアクリロニ
トリル（ＰＡＮ）系、フェノール系、セルロース系等各
種のものを使用できる。加熱手段としては、電気ヒータ
やスチームヒータなどが使用される。Granular activated carbon or activated carbon fiber can be used as the activated carbon material constituting the adsorbent made of activated carbon material, and as the activated carbon fiber, pitch type, polyacrylonitrile (PAN) type, phenol type, cellulose type, etc. Various types can be used. An electric heater, a steam heater, or the like is used as the heating means.
【００１１】また、請求項３に係る発明の有機溶剤汚染
土壌の浄化処理装置は、上述のような目的を達成するた
めに、請求項２の活性炭素材製吸着材として活性炭素繊
維製吸着材を用いた溶剤回収装置において、活性炭素繊
維製吸着材を収容した吸着塔にガス配管を接続するとと
もに、活性炭素繊維製吸着材を間にしたガス配管とは反
対側で、有機溶剤を吸着した後のガスを排出可能に構成
し、かつ、活性炭素繊維製吸着材を間にして、吸着した
有機溶剤を脱着する過熱水蒸気を供給する蒸気供給管
と、脱着した有機溶剤を回収する溶剤回収管とを接続し
て構成する。In order to achieve the above-mentioned object, the apparatus for purifying soil contaminated with organic solvent according to the third aspect of the present invention uses an activated carbon fiber adsorbent as the activated carbon adsorbent of claim 2. In the solvent recovery device used, after connecting the gas pipe to the adsorption tower containing the activated carbon fiber adsorbent, on the side opposite to the gas pipe with the activated carbon fiber adsorbent in between, after adsorbing the organic solvent A gas supply pipe for supplying superheated steam for desorbing the adsorbed organic solvent, and a solvent recovery pipe for recovering the desorbed organic solvent, with an activated carbon fiber adsorbent interposed therebetween. Connect and configure.
【００１２】また、請求項４に係る発明の有機溶剤汚染
土壌の浄化処理装置は、上述のような目的を達成するた
めに、請求項３の溶剤回収装置を、活性炭素繊維製吸着
材を収容した吸着塔を二個備え、両吸着塔に対して、有
機溶剤含有ガスを供給する溶剤吸着状態と、吸着した有
機溶剤を脱着する脱着状態とに背反的に切換える切換機
構を備えて構成する。In order to achieve the above-mentioned object, the apparatus for purifying soil contaminated with organic solvent according to a fourth aspect of the present invention comprises the solvent recovery apparatus according to the third aspect, and an adsorbent made of activated carbon fiber. The above two adsorption towers are provided, and a switching mechanism is provided for both the adsorption towers, which reversely switches between a solvent adsorption state in which the organic solvent-containing gas is supplied and a desorption state in which the adsorbed organic solvent is desorbed.
【００１３】また、請求項５に係る発明の有機溶剤汚染
土壌の浄化処理装置は、上述のような目的を達成するた
めに、請求項２ないし請求項４のいずれかに記載の加熱
制御装置によって制御する温度範囲を40〜45℃に設定す
る。40℃未満になると活性炭素繊維製吸着材に供給され
る有機溶剤含有ガスの相対湿度が30％を越え、吸着効率
を向上できず、一方、45℃を越えると、加熱手段の電力
消費量が増大し、ランニングコストが高くなって不経済
になるからである。The organic solvent-contaminated soil purifying apparatus according to a fifth aspect of the present invention uses the heating control apparatus according to any one of the second to fourth aspects in order to achieve the above object. Set the temperature range to control to 40-45 ℃. When the temperature is lower than 40 ° C, the relative humidity of the organic solvent-containing gas supplied to the activated carbon fiber adsorbent exceeds 30%, and the adsorption efficiency cannot be improved. On the other hand, when the temperature exceeds 45 ° C, the power consumption of the heating means is low. This is because the cost will increase, running costs will increase, and it will be uneconomical.
【００１４】[0014]
【作用】請求項１に係る発明の有機溶剤汚染土壌の浄化
処理方法の構成によれば、地下土壌中の有機溶剤を真空
吸引装置により抽気し、その抽気した土壌中の有機溶剤
を含有するガスを活性炭素材製吸着材で吸着し、大気中
への放出を無くすことができる。According to the constitution of the method for purifying soil contaminated with organic solvent of the invention according to claim 1, the organic solvent in the underground soil is extracted by a vacuum suction device, and the gas containing the extracted organic solvent in the soil is extracted. Can be adsorbed by an adsorbent made of an activated carbon material to eliminate the release into the atmosphere.
【００１５】請求項２に係る発明の有機溶剤汚染土壌の
浄化処理装置の構成によれば、地下土壌中の有機溶剤を
多孔管と気液分離器とを介して真空吸引装置により抽気
し、そこに含まれる水分を気液分離器で分離除去した
後、土壌中の有機溶剤を含有するガスを、活性炭素材製
吸着材に供給する前に加熱して設定範囲内の高温状態に
維持するから、活性炭素材製吸着材に供給する有機溶剤
含有ガスの相対湿度を低下できるとともに変動を抑える
ことができる。According to the constitution of the purification treatment apparatus for soil contaminated with organic solvent of the invention according to claim 2, the organic solvent in the underground soil is extracted by the vacuum suction device through the porous tube and the gas-liquid separator, After separation and removal of water contained in a gas-liquid separator, the gas containing the organic solvent in the soil is heated before being supplied to the activated carbon material adsorbent to maintain a high temperature within a set range, The relative humidity of the organic solvent-containing gas supplied to the activated carbon adsorbent can be reduced and fluctuations can be suppressed.
【００１６】請求項３に係る発明の有機溶剤汚染土壌の
浄化処理装置の構成によれば、土壌から吸引された有機
溶剤含有ガスを活性炭素繊維製吸着材に供給して吸着さ
せ、そして、蒸気供給管から活性炭素繊維製吸着材に過
熱水蒸気を供給することにより、吸着した有機溶剤を脱
着して溶剤回収管を通じて回収できるとともに活性炭素
繊維製吸着材を再生できる。According to the third aspect of the present invention, the organic solvent-contaminated soil purifying apparatus has a structure in which the organic solvent-containing gas sucked from the soil is supplied to the activated carbon fiber adsorbent to be adsorbed, and then vaporized. By supplying superheated steam to the activated carbon fiber adsorbent from the supply pipe, the adsorbed organic solvent can be desorbed and recovered through the solvent recovery pipe, and the activated carbon fiber adsorbent can be regenerated.
【００１７】請求項４に係る発明の有機溶剤汚染土壌の
浄化処理装置の構成によれば、二個の吸着塔のいずれか
の活性炭素繊維製吸着材に有機溶剤含有ガスを供給して
有機溶剤を連続的に吸着しながら、有機溶剤含有ガスを
供給しない側の吸着塔において、吸着した有機溶剤を脱
着することができる。According to the configuration of the apparatus for purifying soil contaminated with organic solvent according to the fourth aspect of the invention, the organic solvent-containing gas is supplied to the activated carbon fiber adsorbent in either of the two adsorption towers to supply the organic solvent. It is possible to desorb the adsorbed organic solvent in the adsorption tower on the side to which the organic solvent-containing gas is not supplied, while continuously adsorbing the adsorbent.
【００１８】請求項５に係る発明の有機溶剤汚染土壌の
浄化処理装置の構成によれば、有機溶剤含有ガスの相対
湿度を30％以下にしさえすれば、活性炭素繊維製吸着材
による吸着効率がほとんど変わらないことに着目し、加
熱制御温度範囲を40〜45℃に設定することにより、有機
溶剤含有ガスの相対湿度を30％以下に維持するとともに
電力消費量を低減することができる。According to the configuration of the apparatus for purifying soil contaminated with organic solvent according to the fifth aspect of the present invention, if the relative humidity of the gas containing organic solvent is set to 30% or less, the adsorption efficiency by the activated carbon fiber adsorbent is increased. Focusing on the fact that there is almost no change, by setting the heating control temperature range to 40 to 45 ° C, it is possible to maintain the relative humidity of the gas containing an organic solvent at 30% or less and reduce the power consumption.
【００１９】[0019]
【実施例】次に、本発明の実施例を図面に基づいて詳細
に説明する。Embodiments of the present invention will now be described in detail with reference to the drawings.
【００２０】図１は、有機溶剤汚染土壌の浄化処理方法
を実施するための有機溶剤汚染土壌の浄化処理装置の実
施例を示すフローシートであり、この図において、１
は、トリクロロエタンなどの有機溶剤によって汚染され
た地下土壌Ｚ１中に埋設した多孔管を示し、その地下土
壌Ｚ１中に埋設した部分において、多数の通気孔（図番
省略）が分散形成されている。FIG. 1 is a flow sheet showing an embodiment of an apparatus for treating organic solvent-contaminated soil for implementing the method for treating organic solvent-contaminated soil.
Indicates a perforated pipe buried in the underground soil Z1 contaminated with an organic solvent such as trichloroethane, and a large number of vent holes (illustration number omitted) are dispersedly formed in the portion buried in the underground soil Z1.
【００２１】多孔管１…に、開閉弁２を介装した第１の
配管３を介して、気液分離器としての真空タンク４を接
続し、その真空タンク４の上部に第２の配管５を介して
真空吸引装置としての真空ポンプ６を接続するととも
に、下部に排水ポンプ７を介装した排水管８を接続し、
地下土壌Ｚ１中の有機溶剤を真空吸引によって抽気する
とともに、混入している水分を分離して排出できるよう
になっている。図中Ｚ２は不透水層を、Ｚ３は、地下水
が流れる帯水層をそれぞれ示している。A vacuum tank 4 as a gas-liquid separator is connected to the perforated pipes 1 ... Through a first pipe 3 having an open / close valve 2, and a second pipe 5 is provided above the vacuum tank 4. The vacuum pump 6 as a vacuum suction device is connected via, and the drain pipe 8 having the drain pump 7 is connected to the lower part,
The organic solvent in the underground soil Z1 can be extracted by vacuum suction, and the mixed water can be separated and discharged. In the figure, Z2 indicates an impermeable layer, and Z3 indicates an aquifer through which groundwater flows.
【００２２】真空ポンプ６に第３の配管９を介して補給
水槽１０を接続するとともに、その補給水槽１０と真空
ポンプ６とを補給管１１を介して接続し、水封式のポン
プに構成してある。A make-up water tank 10 is connected to the vacuum pump 6 via a third pipe 9, and the make-up water tank 10 and the vacuum pump 6 are connected via a make-up pipe 11 to form a water-sealed pump. There is.
【００２３】補給水槽１０には、開閉弁１２ａを介装す
るとともに、先端にボールタップ機構１２ｂを付設した
給水管１２を接続し、補給水槽１０内の水量が下限設定
量以下になったときにボールタップ機構１２ｂにより開
いて水を補給し、一方、補給に伴って上限設定量以上に
なったときにボールタップ機構１２ｂにより閉じて補給
を停止し、補給水槽１０内に設定範囲内の水量を常に貯
留するようになっている。An open / close valve 12a is interposed in the makeup water tank 10 and a water supply pipe 12 having a ball tap mechanism 12b attached to the tip thereof is connected to the makeup water tank 10. When the amount of water in the makeup water tank 10 falls below a lower limit set amount, a ball tap is made. The mechanism 12b opens to replenish the water, and when the replenishment exceeds the upper limit set amount, the ball tap mechanism 12b closes to stop the replenishment, and the replenishment water tank 10 always stores the amount of water within the set range. It is like this.
【００２４】補給水槽１０に第４の配管１３を介して除
塵ならびに水滴除去用のミストセパレーター１４を接続
し、そのミストセパレーター１４に送風機Ｆを介装した
ガス配管１５を介して溶剤回収装置１６を接続する。溶
剤回収装置１６は、ガス吸着用エレメントＡをフィルタ
ーとして取り付けた吸着塔１７を並列状態で設置して構
成し、両吸着塔１７，１７の下部側空間それぞれに、第
１の電磁弁１８を介して前記ガス配管１５を接続すると
ともに、第２の電磁弁１９を介してコンデンサー２０お
よびセパレータ２１を介装した溶剤回収管２２を接続す
る。A mist separator 14 for removing dust and water droplets is connected to the makeup water tank 10 via a fourth pipe 13, and a solvent recovery device 16 is connected to the mist separator 14 via a gas pipe 15 having a blower F. Connecting. The solvent recovery device 16 is configured by arranging adsorption towers 17 in which gas adsorption elements A are mounted as filters in a parallel state, and through a first solenoid valve 18 in each of the lower spaces of both adsorption towers 17, 17. The gas pipe 15 is connected to the solvent recovery pipe 22 via the second solenoid valve 19 and the condenser 20 and the separator 21 are interposed therebetween.
【００２５】両吸着塔１７，１７の上方側を、排ガス部
２３ａを備えたカバー２３で覆い、そして、吸着塔１
７，１７それぞれの上部開口に、カバー２３に取り付け
たエアシリンダ２４によって開閉動作される弁体２５を
設け、かつ、その弁体２５により閉じられた状態の空間
に接続するように、第３の電磁弁２６を介装した蒸気供
給管２７をガス吸着用エレメントＡ内に接続する。The upper side of both adsorption towers 17, 17 is covered with a cover 23 having an exhaust gas portion 23a, and the adsorption tower 1
A valve body 25 that is opened and closed by an air cylinder 24 attached to the cover 23 is provided in the upper opening of each of the valves 7 and 17, and the third valve is connected to the space closed by the valve body 25. A vapor supply pipe 27 having a solenoid valve 26 interposed therein is connected to the inside of the gas adsorbing element A.
【００２６】以上の構成により、前記第１ないし第３の
電磁弁１８，１８、１９，１９、２６，２６、および、
弁体２５，２５それぞれを背反的に開閉し、一方の吸着
塔１７に地下土壌Ｚ１から抽気した有機溶剤含有ガスを
供給してガス吸着用エレメントＡを通過させ、ガス吸着
用エレメントＡを構成する円筒状の活性炭素繊維製吸着
材２８に有機溶剤を吸着する。同時に、他方の吸着塔１
７においては、過熱水蒸気の供給により、円筒状の活性
炭素繊維製吸着材２８に吸着された有機溶剤を加熱脱着
して活性炭素繊維製吸着材２８を再生し、脱着された溶
剤を、コンデンサー２０を経てセパレータ２１に供給
し、溶剤を比重分離によって回収するようになってい
る。With the above structure, the first to third solenoid valves 18, 18, 19, 19, 26, 26, and
Each of the valve bodies 25, 25 is opened and closed in a contradictory manner, the organic solvent-containing gas extracted from the underground soil Z1 is supplied to one of the adsorption towers 17 to pass through the gas adsorbing element A, and the gas adsorbing element A is configured. The organic solvent is adsorbed on the cylindrical activated carbon fiber adsorbent 28. At the same time, the other adsorption tower 1
In No. 7, by supplying superheated steam, the organic solvent adsorbed on the cylindrical activated carbon fiber adsorbent 28 is heated and desorbed to regenerate the activated carbon fiber adsorbent 28, and the desorbed solvent is removed from the condenser 20. After that, the solvent is supplied to the separator 21 and the solvent is recovered by specific gravity separation.
【００２７】上述した過熱水蒸気としては、水蒸気供給
源側あるいは蒸気供給管２７の途中箇所などに熱交換器
を設け、加熱側に蒸気供給管２７中の蒸気よりも高圧・
高温の蒸気を供給して加熱を行い、飽和状態に対する相
対湿度が30％以下になった水蒸気を活性炭素繊維製吸着
材２８に供給するように構成するものである。また、前
記熱交換器の代わりに電気ヒータなどの加熱装置を設け
ても良い。As the above-mentioned superheated steam, a heat exchanger is provided on the steam supply source side or at an intermediate position of the steam supply pipe 27, and the heating side has a pressure higher than that of the steam in the steam supply pipe 27.
It is configured such that high-temperature steam is supplied to heat the steam, and steam having a relative humidity of 30% or less with respect to the saturated state is supplied to the activated carbon fiber adsorbent 28. A heating device such as an electric heater may be provided instead of the heat exchanger.
【００２８】両吸着塔１７，１７に対して、有機溶剤含
有ガスを供給する溶剤吸着状態と、吸着した有機溶剤を
脱着する脱着状態とに背反的に切換えるための、前記第
１ないし第３の電磁弁１８，１８、１９，１９、２６，
２６、および、弁体２５，２５から成るものをして切換
機構と総称する。For the adsorption towers 17 and 17, the first to the third means for switching between the solvent adsorption state in which the organic solvent-containing gas is supplied and the desorption state in which the adsorbed organic solvent is desorbed Solenoid valves 18, 18, 19, 19, 26,
26 and the valve bodies 25, 25 are collectively referred to as a switching mechanism.
【００２９】活性炭素繊維製吸着材２８は、公称比表面
積1000ｍ2 ／ｇのピッチ系活性炭素繊維（Ａ−１０：株
式会社アドール製）をフェルト状に加工した活性炭素繊
維フェルト（ＦＮ３００ＧＦ１０：大阪ガスケミカル株
式会社製）で構成する。The activated carbon fiber adsorbent 28 is an activated carbon fiber felt (FN300GF10: Osaka Gas) obtained by processing a pitch type activated carbon fiber (A-10: made by Adol Co., Ltd.) having a nominal specific surface area of 1000 m 2 / g into a felt shape. Chemical Co., Ltd.).
【００３０】ガス配管１５の送風機Ｆよりも上流側に、
加熱手段としての電気ヒータ２９を設け、一方、下流側
に、ガス配管１５内を流れる有機溶剤含有ガスの温度を
測定する温度センサ３０を設け、温度センサ３０に加熱
制御装置３１を接続するとともに、その加熱制御装置３
１に電気ヒータ２９を接続する。On the upstream side of the blower F of the gas pipe 15,
An electric heater 29 as heating means is provided, while a temperature sensor 30 for measuring the temperature of the organic solvent-containing gas flowing in the gas pipe 15 is provided on the downstream side, and a heating control device 31 is connected to the temperature sensor 30. The heating control device 3
The electric heater 29 is connected to 1.
【００３１】加熱制御装置３１において、温度範囲を40
〜45℃に設定してあり、温度センサ３０による測定温度
が40℃未満になると電気ヒータ２９に通電し、一方、測
定温度が45℃を越えると電気ヒータ２９への通電を停止
し、ガス吸着用エレメントＡに供給する有機溶剤含有ガ
スの温度を40〜45℃の範囲内に維持するように構成す
る。In the heating control device 31, the temperature range is set to 40
The temperature is set to ~ 45 ° C, and the electric heater 29 is energized when the temperature measured by the temperature sensor 30 is less than 40 ° C, while the electric heater 29 is deenergized when the measured temperature exceeds 45 ° C, and gas adsorption is performed. The temperature of the organic solvent-containing gas supplied to the working element A is maintained within the range of 40 to 45 ° C.
【００３２】すなわち、上述活性炭素繊維製吸着材２８
を構成する活性炭素繊維フェルトでは、図２の水分吸着
等温線のグラフに示すように、相対圧すなわち相対湿度
が40％以上では、その水分吸着量が増大するため、有機
溶剤の吸着量が減少することになる。また、吸着しよう
とする有機溶剤であるトリクロロエチレンでは、図３の
20℃における吸着等温線のグラフに示すように、相対湿
度が30％の場合に、相対湿度が０％の場合とほぼ変わら
ない吸着量が得られるが、相対湿度が60％、90％と上昇
するに連れて吸着量が減少する。That is, the activated carbon fiber adsorbent 28 is used.
In the activated carbon fiber felt that composes, as shown in the graph of the moisture adsorption isotherm of FIG. 2, when the relative pressure, that is, the relative humidity is 40% or more, the moisture adsorption amount increases, so the adsorption amount of the organic solvent decreases. Will be done. In addition, in the case of trichlorethylene, which is an organic solvent to be adsorbed,
As shown in the adsorption isotherm graph at 20 ° C, when the relative humidity is 30%, the amount of adsorption is almost the same as when the relative humidity is 0%, but the relative humidity increases to 60% and 90%. The adsorption amount decreases as it does.
【００３３】また、例えば、温度20℃で相対湿度 100％
の有機溶剤含有ガスの相対湿度を60％、30％と低下させ
るに必要な温度は、順に９℃上昇させた29℃、21℃上昇
させた41℃となり、相対湿度が約30％よりも低くなるよ
うにするためには、有機溶剤含有ガスの温度を40℃以上
にすることが望ましく、また、電力消費量を低減する上
で45℃程度までにするのが望ましいからである。Further, for example, the temperature is 20 ° C. and the relative humidity is 100%.
The temperatures required to lower the relative humidity of the organic solvent-containing gas to 60% and 30% are 29 ° C which is increased by 9 ° C and 41 ° C which is increased by 21 ° C, respectively, and the relative humidity is lower than about 30%. This is because the temperature of the organic solvent-containing gas is preferably 40 ° C. or higher, and is preferably up to about 45 ° C. in order to reduce power consumption.
【００３４】以上の構成により、活性炭素繊維製吸着材
２８に供給する有機溶剤含有ガスの温度を設定以上に上
昇して、その相対湿度を低下し、活性炭素繊維製吸着材
２８に吸着される水分量を減少して有機溶剤の吸着効率
を向上するとともに、相対湿度の変動を抑えて安定した
吸着を行うことができるようになっている。With the above structure, the temperature of the organic solvent-containing gas supplied to the activated carbon fiber adsorbent 28 is raised above the set value to reduce the relative humidity thereof and the adsorbent 28 is adsorbed on the activated carbon fiber adsorbent 28. It is possible to reduce the amount of water to improve the adsorption efficiency of the organic solvent and suppress the fluctuation of the relative humidity to perform stable adsorption.
【００３５】次に、比較実験結果について説明する。比
較例としては、前述実施例において、電気ヒータ２９お
よび加熱制御装置３１による温度制御を行わないものを
対象とした。Next, the results of comparative experiments will be described. As a comparative example, the one in which the temperature control by the electric heater 29 and the heating control device 31 is not performed in the above-described embodiment is targeted.
【００３６】実施例において、溶剤回収装置１６に供給
される直前の有機溶剤含有ガスの温度Ｔを40〜45℃の範
囲内に維持するように制御して相対湿度Ｈを測定したと
ころ、図４の温度および相対湿度それぞれを吸着時間ご
との値で示すグラフに示すように、30％程度に維持でき
た。In the example, the relative humidity H was measured by controlling the temperature T of the organic solvent-containing gas immediately before being supplied to the solvent recovery device 16 so as to be maintained within the range of 40 to 45 ° C. The temperature and relative humidity were maintained at about 30% as shown in the graph showing the values for each adsorption time.
【００３７】一方、比較例において、溶剤回収装置１６
に供給される直前の有機溶剤含有ガスの温度Ｔと相対湿
度Ｈそれぞれを測定したところ、図５の温度および相対
湿度それぞれを吸着時間ごとの値で示すグラフに示す結
果が得られた。この結果から、日中の晴天時には、ガス
配管１５を介して有機溶剤含有ガスが温められて相対湿
度Ｈが低下するが、夜間に外気温が低くなると相対湿度
Ｈが高くなるといったように、天候や時間などの影響を
受けて相対湿度Ｈが変動することがわかる。On the other hand, in the comparative example, the solvent recovery device 16
When the temperature T and the relative humidity H of the organic solvent-containing gas immediately before being supplied to were measured, the results shown in the graph of FIG. 5 showing the temperature and the relative humidity by adsorption time were obtained. From this result, when the weather is fine during the daytime, the organic solvent-containing gas is warmed through the gas pipe 15 and the relative humidity H decreases. It can be seen that the relative humidity H fluctuates under the influence of temperature and time.
【００３８】そして、実施例において、トリクロロエチ
レンで汚染された地下土壌Ｚ１から多孔管１、真空タン
ク４および真空ポンプ６を介して抽気した。その抽気後
の有機溶剤含有ガスは、トリクロロエチレンの平均濃度
が100ppmで相対湿度がほぼ 100％、温度が20℃であっ
た。この有機溶剤含有ガスを風量５ｍ3 ／min で、か
つ、加熱制御装置３１で40〜45℃の範囲内に維持するよ
うに制御して溶剤回収装置１６に供給して吸着処理し
た。Then, in the example, air was extracted from the underground soil Z1 contaminated with trichlorethylene through the perforated pipe 1, the vacuum tank 4 and the vacuum pump 6. The gas containing organic solvent after the extraction had an average concentration of trichlorethylene of 100 ppm, a relative humidity of almost 100%, and a temperature of 20 ° C. This organic solvent-containing gas was supplied to the solvent recovery device 16 at a flow rate of 5 m 3 / min and controlled by the heating control device 31 so as to be maintained within the range of 40 to 45 ° C. to be adsorbed.
【００３９】２時間経過後に、一方の吸着塔１７の活性
炭素繊維製吸着材２８が破過状態になったため、切換機
構により切り換え、有機溶剤含有ガスを他方の吸着塔１
７に導いて吸着処理を連続的に行いながら、破過状態に
なった側の吸着塔１７に水蒸気量45kg／Hrで10分間過熱
水蒸気を供給し、吸着したトリクロロエチレンを脱着し
て回収するとともに活性炭素繊維製吸着材２８を再生処
理した。これらの操作を繰り返すことによって、トリク
ロロエチレンを大気中に放出すること無く連続的に吸着
処理できた。After a lapse of 2 hours, the activated carbon fiber adsorbent 28 in one of the adsorption towers 17 is in a breakthrough state, so that the switching mechanism is used to switch the gas containing the organic solvent to the other adsorption tower 1.
While continuously conducting the adsorption treatment by leading to 7, the superheated steam was supplied to the adsorption tower 17 on the breakthrough side at a steam amount of 45 kg / Hr for 10 minutes to desorb and recover the adsorbed trichlorethylene and activate it. The carbon fiber adsorbent 28 was regenerated. By repeating these operations, trichlorethylene could be continuously adsorbed without being released into the atmosphere.
【００４０】前述した比較例のように、相対湿度Ｈが変
動する状態において活性炭素繊維製吸着材２８で有機溶
剤を吸着処理した場合、水分の吸着量が増加するため
に、破過状態に至るまでの時間が早くなり、かつ、図３
に示したように、相対湿度が変動すると活性炭素繊維に
吸着できる有機溶剤量が変動するため、実施例で示した
ような吸着−脱着サイクルを時間により制御することが
不可能であった。When the organic carbon is adsorbed by the activated carbon fiber adsorbent 28 in a state where the relative humidity H changes as in the above-mentioned comparative example, the amount of adsorbed water increases, resulting in a breakthrough state. To get faster, and Fig. 3
As described above, when the relative humidity fluctuates, the amount of the organic solvent that can be adsorbed on the activated carbon fiber fluctuates, so that it is impossible to control the adsorption-desorption cycle by time as shown in the examples.
【００４１】上記実施例では、吸着塔１７を二個設け、
ガス吸着用エレメントＡを構成する活性炭素繊維製吸着
材２８に対し、有機溶剤の吸着と過熱水蒸気による脱着
再生を交互に行って連続的に有機溶剤を回収する、いわ
ゆる二塔式の溶剤回収装置１６を使用しているが、本発
明としては、いわゆる一塔タイプの溶剤回収装置を使用
し、活性炭素繊維製吸着材２８による有機溶剤の吸着が
飽和に達するに相当する時間を見込んだ所定時間が経過
するたびに、一時的に真空ポンプ６を停止し、多孔管１
…からの有機溶剤の抽気を中断するとともに有機溶剤の
吸着を中断して脱着状態に切換え、過熱水蒸気を供給し
て吸着した有機溶剤を脱着できるようにするとともに、
その脱着した溶剤をコンデンサーで凝縮液化し、かつ、
セパレータで回収するようにしても良い。脱着回収した
溶剤は、産業廃棄物の処理工程などの後処理に付しても
良い。In the above embodiment, two adsorption towers 17 are provided,
A so-called two-column type solvent recovery device for continuously recovering the organic solvent by alternately performing adsorption of the organic solvent and desorption regeneration with superheated steam on the activated carbon fiber adsorbent 28 constituting the gas adsorbing element A. Although 16 is used, the present invention uses a so-called one-column type solvent recovery device, and a predetermined time period in which adsorption of the organic solvent by the activated carbon fiber adsorbent 28 is expected to reach saturation Each time, the vacuum pump 6 is temporarily stopped and the perforated pipe 1
While the extraction of the organic solvent from ... is interrupted and the adsorption of the organic solvent is interrupted to switch to the desorption state, superheated steam is supplied so that the adsorbed organic solvent can be desorbed.
The desorbed solvent is condensed and liquefied by a condenser, and
You may make it collect | recover with a separator. The desorbed and recovered solvent may be subjected to post-treatment such as a process for treating industrial waste.
【００４２】また、本発明としては、一塔タイプの溶剤
回収装置において、活性炭素繊維製吸着材２８に代えて
粒状活性炭を用い、破過状態になるたびにカートリッジ
式に交換するとか、あるいは、活性炭素繊維製吸着材２
８を用いてカートリッジ式に交換するように構成するも
のでも良い。Further, according to the present invention, in the one-column type solvent recovery apparatus, granular activated carbon is used in place of the activated carbon fiber adsorbent 28, and it is replaced with a cartridge type each time a breakthrough state occurs, or Activated carbon fiber adsorbent 2
8 may be used to replace the cartridge type.
【００４３】上述実施例では、トリクロロエチレンで汚
染された土壌の浄化を対象とするために、加熱制御温度
範囲を40〜45℃に設定しているが、その加熱制御温度範
囲は、処理しようとする有機溶剤汚染土壌に応じて適宜
設定すれば良い。In the above embodiment, the heating control temperature range is set to 40 to 45 ° C. in order to purify the soil contaminated with trichlorethylene, but the heating control temperature range is to be treated. It may be appropriately set depending on the organic solvent-contaminated soil.
【００４４】また、溶剤回収装置１６に供給する前に、
真空ポンプ６からの有機溶剤含有ガスを濃縮装置に供給
して濃縮処理し、その高濃度の有機溶剤含有ガスを溶剤
回収装置１６に供給して有機溶剤を吸着させるように構
成しても良い。Before supplying to the solvent recovery device 16,
The organic solvent-containing gas from the vacuum pump 6 may be supplied to the concentrating device for concentration treatment, and the high-concentration organic solvent-containing gas may be supplied to the solvent recovery device 16 to adsorb the organic solvent.
【００４５】また、上述実施例では、溶剤回収装置１６
に供給される有機溶剤含有ガスの温度を40〜45℃の範囲
内に制御し、有機溶剤含有ガスの相対湿度が約30％より
も低くなるようにして、吸着効率を十分に向上しながら
電力消費量を低減できるように構成しているが、本発明
としては、例えば、温度を30〜35℃の範囲内に制御し、
相対湿度が約60％よりも低くなるようにして、ある程度
の吸着効率の向上を図りながら、電力消費量をより一層
低減してランニングコストを軽減するように構成しても
良い。Further, in the above embodiment, the solvent recovery device 16
The temperature of the organic solvent-containing gas supplied to the device is controlled within the range of 40 to 45 ° C so that the relative humidity of the organic solvent-containing gas becomes lower than about 30%, and the adsorption efficiency is sufficiently improved while the electric power is reduced. Although configured to reduce the amount of consumption, as the present invention, for example, the temperature is controlled within the range of 30 ~ 35 ° C.,
The relative humidity may be lower than about 60% to improve the adsorption efficiency to some extent, and further reduce the power consumption and the running cost.
【００４６】また、前述した第４の配管１３の途中箇
所、あるいは、ミストセパレーター１４自体に冷却装置
を付設し、ミストセパレーター１４に供給される有機溶
剤含有ガス中の水分を凝縮液化してミストセパレーター
１４で除去し、ガス配管１５に流される有機溶剤含有ガ
ス中の水分量を減少して相対湿度を低下させておいても
良い。このようにすれば、電気ヒータ２９による加熱温
度が低くても溶剤回収装置１６での吸着効率を向上でき
る利点がある。Further, a cooling device is attached to an intermediate portion of the above-mentioned fourth pipe 13 or to the mist separator 14 itself so that the water contained in the organic solvent-containing gas supplied to the mist separator 14 is condensed and liquefied. It is also possible to reduce the relative humidity by reducing the amount of water in the organic solvent-containing gas flowing through the gas pipe 15 and removing it in 14. By doing so, there is an advantage that the adsorption efficiency in the solvent recovery device 16 can be improved even if the heating temperature by the electric heater 29 is low.
【００４７】また、真空タンク４から排水ポンプ７を介
して排出される水はトリクロロエタンなどの有機溶剤を
含んでいるので、次のような処理をすることができる。
すなわち、当該水を別のタンク（図示せず）に受け、ポ
ンプを用いて曝気処理槽（図示せず）の上方から散水す
るとともに、曝気処理槽の下方からブロワー（図示せ
ず）で空気を導入して曝気処理し、曝気処理槽の下部か
ら得られる有機溶剤が除去された処理水を放流する。ま
た、曝気処理槽の上部から得られる有機溶剤を含んだ空
気を、配管（図示せず）を介して図１のミストセパレー
ター１４の手前の配管１３に接続することにより合流さ
せ、地下土壌Ｚ１から抽気した有機溶剤含有ガスと共に
吸着塔１７で処理する。Since the water discharged from the vacuum tank 4 through the drainage pump 7 contains an organic solvent such as trichloroethane, the following treatment can be carried out.
That is, the water is received in another tank (not shown), water is sprinkled from above the aeration treatment tank (not shown) using a pump, and air is blown from below the aeration treatment tank with a blower (not shown). It is introduced and subjected to aeration treatment, and the treated water from which the organic solvent obtained from the lower part of the aeration treatment tank is removed is discharged. Further, the air containing the organic solvent obtained from the upper part of the aeration treatment tank is connected to the pipe 13 before the mist separator 14 of FIG. It is treated in the adsorption tower 17 together with the extracted gas containing the organic solvent.
【００４８】上記実施例では、吸着塔１７内に円筒状の
活性炭素繊維製吸着材２８を設けて溶剤回収装置１６を
構成しているが、例えば、シート状の活性炭素繊維製吸
着材を多層に積層して収容することにより溶剤回収装置
を構成しても良い。In the above-mentioned embodiment, the solvent recovery device 16 is constructed by providing the cylindrical active carbon fiber adsorbent 28 in the adsorption tower 17, but, for example, a sheet-shaped active carbon fiber adsorbent is provided in multiple layers. The solvent recovery device may be configured by stacking and accommodating the above.
【００４９】真空吸引装置としては、上述実施例のよう
な真空ポンプ６に限らず、例えば、ブロワー用い、その
ブロワーと多孔管１…とを接続する第１の配管３の途中
箇所に気液分離器として液切り用の邪魔板を付設するな
ど各種の変形が可能である。The vacuum suction device is not limited to the vacuum pump 6 as in the above-described embodiment, but, for example, a blower is used, and gas-liquid separation is performed at an intermediate point of the first pipe 3 connecting the blower and the perforated pipe 1. Various modifications are possible such as attaching a baffle plate for draining as a container.
【００５０】本発明の有機溶剤汚染土壌の浄化処理方法
としては、地下土壌中から吸引した有機溶剤含有ガス中
の有機溶剤を活性炭素材製吸着材に吸着できさえすれば
良く、加熱手段としての電気ヒータ２９や温度センサ３
０や加熱制御装置３１を備えないものをも含む。The method for purifying soil contaminated with organic solvent of the present invention is only required to be able to adsorb the organic solvent in the gas containing organic solvent sucked from the underground soil to the adsorbent made of activated carbon material, and to use electricity as a heating means. Heater 29 and temperature sensor 3
0 and those not provided with the heating control device 31 are also included.
【００５１】[0051]
【発明の効果】請求項１に係る発明の有機溶剤汚染土壌
の浄化処理方法によれば、真空吸引装置により抽気した
有機溶剤含有ガスを活性炭素材製吸着材に供給し、有機
溶剤を活性炭素材製吸着材に吸着するから、抽気した有
機溶剤を大気中に放出せず、環境破壊を防止できるよう
になった。According to the method for purifying soil contaminated with organic solvent according to the first aspect of the present invention, the organic solvent-containing gas extracted by the vacuum suction device is supplied to the activated carbon material adsorbent, and the organic solvent is activated carbon material. Since it is adsorbed by the adsorbent, the extracted organic solvent is not released into the atmosphere, and environmental damage can be prevented.
【００５２】請求項２に係る発明の有機溶剤汚染土壌の
浄化処理装置によれば、請求項１に係る発明の有機溶剤
汚染土壌の浄化処理方法を実施するために、真空吸引装
置により多孔管および気液分離器を介して土壌中の有機
溶剤を抽気し、その抽気した有機溶剤含有ガスの相対湿
度を低下して活性炭素材製吸着材に供給し、有機溶剤を
活性炭素材製吸着材に吸着するから、抽気した有機溶剤
を大気中に放出せず、環境破壊を防止でき、かつ、活性
炭素材製吸着材に吸着される水分量を減少できて有機溶
剤の吸着効率を向上でき、有機溶剤を良好に吸着して回
収できるようになった。According to the purification treatment apparatus for organic solvent-contaminated soil of the invention of claim 2, in order to implement the purification treatment method for organic solvent-contaminated soil of the invention of claim 1, a porous pipe and a vacuum suction device are used. The organic solvent in the soil is extracted through the gas-liquid separator, the relative humidity of the extracted organic solvent-containing gas is reduced and supplied to the activated carbon adsorbent, and the organic solvent is adsorbed on the activated carbon adsorbent. Therefore, the extracted organic solvent is not released into the atmosphere, environmental damage can be prevented, and the amount of water adsorbed on the adsorbent made of activated carbon material can be reduced to improve the adsorption efficiency of the organic solvent. It became possible to collect it by adsorbing it on.
【００５３】また、加熱制御装置によって有機溶剤含有
ガスの加熱温度を設定範囲に維持するから、有機溶剤含
有ガスの相対湿度の変動を抑えることができ、例えば、
季節や天候によって、溶剤回収装置に至るガス配管内を
通る有機溶剤含有ガスの温度が変化してその相対湿度が
変動し、そのような溶剤回収装置に供給される有機溶剤
含有ガスを単純に加熱した場合に、その加熱量が不足し
て所定の相対湿度まで低下できないとか、あるいは、逆
に、必要以上に加熱し、電力消費量が多くなってランニ
ングコストが高くなるといったことを回避でき、安定し
た状態で有機溶剤を良好に吸着して回収できるとともに
経済性を向上できる。Further, since the heating temperature of the organic solvent-containing gas is maintained within the set range by the heating control device, fluctuations in the relative humidity of the organic solvent-containing gas can be suppressed.
Depending on the season and weather, the temperature of the organic solvent-containing gas that passes through the gas pipe leading to the solvent recovery device changes and its relative humidity fluctuates, and the organic solvent-containing gas supplied to such a solvent recovery device is simply heated. In that case, it is possible to avoid that the heating amount is insufficient and it cannot be lowered to a predetermined relative humidity, or conversely, heating is performed more than necessary and power consumption increases and running cost increases, which is stable. In this state, the organic solvent can be favorably adsorbed and recovered, and the economical efficiency can be improved.
【００５４】また、請求項３に係る発明の有機溶剤汚染
土壌の浄化処理装置によれば、活性炭素材製吸着材とし
て吸着効率の高い活性炭素繊維製吸着材を用い、しか
も、活性炭素繊維製吸着材に過熱水蒸気を供給し、吸着
した有機溶剤を脱着して回収するから、単位重量当りの
有機溶剤の吸着量が比較的少ない粒状活性炭を用いる場
合に比べて溶剤回収装置を一層小型化できるとともに、
活性炭素繊維製吸着材への有機溶剤の吸着量が飽和にな
る前に適宜再生することができ、活性炭素繊維製吸着材
を交換せずに済み、手間少なく浄化処理を行うことがで
きる。Further, according to the apparatus for purifying soil contaminated with organic solvent according to the third aspect of the present invention, the activated carbon fiber adsorbent having high adsorption efficiency is used as the activated carbon fiber adsorbent, and the activated carbon fiber adsorbent is also used. Since superheated steam is supplied to the material and the adsorbed organic solvent is desorbed and recovered, the solvent recovery device can be further downsized as compared with the case of using granular activated carbon in which the adsorption amount of the organic solvent per unit weight is relatively small. ,
It can be appropriately regenerated before the amount of the organic solvent adsorbed on the activated carbon fiber adsorbent becomes saturated, the activated carbon fiber adsorbent does not need to be replaced, and the purification treatment can be performed with less trouble.
【００５５】また、請求項４に係る発明の有機溶剤汚染
土壌の浄化処理装置によれば、有機溶剤を連続的に吸着
するから、溶剤回収装置への有機溶剤含有ガスの供給を
中断せずに済み、浄化処理を一層良好に行うことができ
る。Further, according to the apparatus for purifying soil contaminated with organic solvent of the invention according to claim 4, since the organic solvent is continuously adsorbed, the supply of the gas containing the organic solvent to the solvent recovery apparatus is not interrupted. Therefore, the purification process can be performed better.
【００５６】また、請求項５に係る発明の有機溶剤汚染
土壌の浄化処理装置によれば、加熱制御温度範囲を40〜
45℃に設定し、有機溶剤含有ガスの相対湿度を30％以下
に維持するとともに不必要な加熱を行わないから、電力
消費量を低減してランニングコストを極力低減するとと
もに脱着再生に至る時間を極力長くしながら、有機溶剤
を良好に吸着できる。Further, according to the apparatus for purifying soil contaminated with organic solvent according to the fifth aspect of the present invention, the heating control temperature range is 40 to.
The temperature is set to 45 ° C, the relative humidity of the gas containing organic solvent is maintained at 30% or less, and unnecessary heating is not performed. Therefore, the power consumption is reduced, the running cost is reduced as much as possible, and the time to desorption regeneration is reduced. The organic solvent can be satisfactorily adsorbed while being made as long as possible.
【図１】本発明に係る有機溶剤汚染土壌の浄化処理方法
を実施するための有機溶剤汚染土壌の浄化処理装置の実
施例を示すフローシートである。FIG. 1 is a flow sheet showing an embodiment of an apparatus for purifying organic solvent-contaminated soil for carrying out the method for purifying organic solvent-contaminated soil according to the present invention.
【図２】水分吸着等温線のグラフである。FIG. 2 is a graph of moisture adsorption isotherm.
【図３】トリクロロエチレンの吸着等温線のグラフであ
る。FIG. 3 is a graph of an adsorption isotherm of trichlorethylene.
【図４】実施例における有機溶剤含有ガスの温度および
相対湿度それぞれを吸着時間ごとの値で示すグラフであ
る。FIG. 4 is a graph showing the temperature and relative humidity of the organic solvent-containing gas in the examples as values for each adsorption time.
【図５】比較例における有機溶剤含有ガスの温度および
相対湿度それぞれを吸着時間ごとの値で示すグラフであ
る。FIG. 5 is a graph showing the temperature and relative humidity of an organic solvent-containing gas in Comparative Example, as a value for each adsorption time.
【図６】従来例の有機溶剤汚染土壌の浄化処理装置を示
すフローシートである。FIG. 6 is a flow sheet showing a conventional purification apparatus for organic solvent-contaminated soil.
１…多孔管 ４…気液分離器としての真空タンク ６…真空吸引装置としての真空ポンプ １５…ガス配管 １６…溶剤回収装置 １７…吸着塔 ２２…溶剤回収管 ２７…蒸気供給管 ２８…活性炭素繊維製吸着材 ２９…加熱手段としての電気ヒータ ３０…温度センサ ３１…加熱制御装置 DESCRIPTION OF SYMBOLS 1 ... Perforated pipe 4 ... Vacuum tank as a gas-liquid separator 6 ... Vacuum pump as a vacuum suction device 15 ... Gas pipe 16 ... Solvent recovery device 17 ... Adsorption tower 22 ... Solvent recovery pipe 27 ... Vapor supply pipe 28 ... Activated carbon Fiber adsorbent 29 ... Electric heater as heating means 30 ... Temperature sensor 31 ... Heating control device
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成４年９月７日[Submission date] September 7, 1992
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１３[Correction target item name] 0013
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１３】また、請求項５に係る発明の有機溶剤汚染
上壌の浄化処理装置は、上述のような目的を達成するた
めに、請求項２ないし請求項４のいずれかに記載の加熱
制御装置によって制御する温度範囲を４０〜４５℃に設
定する。４０℃未満になると活性炭素繊維等の活性炭素
材製吸着材に供給される有機溶剤含有ガスの相対湿度が
３０％を越え、吸着効率を向上できず、一方、４５℃を
越えると、加熱手段の電気消費量が増大し、ランニング
コストが高くなって不経済になるからである。In order to achieve the above-mentioned object, the apparatus for purifying organic solvent-contaminated upper layer of the invention according to claim 5 is the heating control apparatus according to any one of claims 2 to 4. The temperature range controlled by is set to 40-45 degreeC. Activated carbon such as activated carbon fiber when the temperature is lower than 40 ° C
The relative humidity of the organic solvent-containing gas supplied to the wood adsorbent exceeds 30%, and the adsorption efficiency cannot be improved. On the other hand, when it exceeds 45 ° C, the electricity consumption of the heating means increases and the running cost is high. It becomes uneconomical.
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１８[Correction target item name] 0018
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１８】請求項５に係る発明の有機溶剤汚染土壌の
浄化処理装置の構成によれば、有機溶剤含有ガスの相対
湿度を３０％以下にしさえすれば、活性炭素繊維等の活
性炭素材製吸着材による吸着効率がほとんど変わらない
ことに着目し、加熱制御温度範囲を４０〜４５℃に設定
することにより、有機溶剤含有ガスの相対湿度を３０％
以下に維持するとともに電気消費量を低減することがで
きる。According to the constitution of the apparatus for purifying soil contaminated with organic solvent of the invention according to claim 5, as long as the relative humidity of the gas containing organic solvent is 30% or less, the activity of activated carbon fiber or the like is reduced.
Focusing on the fact that the adsorption efficiency of the carbonaceous adsorbent is almost unchanged, the relative humidity of the organic solvent-containing gas is set to 30% by setting the heating control temperature range to 40 to 45 ° C.
The power consumption can be reduced while maintaining the following.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 前田 武士 大阪市中央区平野町四丁目１番２号 大阪 瓦斯株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Maeda 4-1-2, Hiranocho, Chuo-ku, Osaka City Osaka Gas Co., Ltd.
Claims (5)
設し、その多孔管を通して真空吸引装置により有機溶剤
を吸引し、吸引した有機溶剤含有ガスを活性炭素材製吸
着材に供給して有機溶剤を吸着処理することを特徴とす
る有機溶剤汚染土壌の浄化処理方法。1. A perforated tube is embedded in soil containing an organic solvent, the organic solvent is sucked by a vacuum suction device through the perforated tube, and the sucked organic solvent-containing gas is supplied to an adsorbent made of an activated carbon material. A method for purifying soil contaminated with an organic solvent, which comprises adsorbing a solvent.
介して真空吸引装置を接続するとともに、その真空吸引
装置に、有機溶剤含有ガスを供給して有機溶剤を活性炭
素材製吸着材に吸着する溶剤回収装置をガス配管を介し
て接続し、かつ、前記ガス配管に、前記溶剤回収装置に
供給される有機溶剤含有ガスを加熱する加熱手段を設
け、前記加熱手段で加熱された有機溶剤含有ガスの温度
を測定する温度センサを設けるとともに、前記温度セン
サで測定された温度が設定範囲内に維持されるように前
記加熱手段を作動する加熱制御装置を備えたことを特徴
とする有機溶剤汚染土壌の浄化処理装置。2. An adsorbent made of an activated carbon material, which comprises connecting a vacuum suction device to a perforated pipe buried in soil through a gas-liquid separator and supplying a gas containing an organic solvent to the vacuum suction device. Is connected to the solvent recovery device for adsorbing on the gas pipe, and the gas pipe is provided with heating means for heating the organic solvent-containing gas supplied to the solvent recovery device, and the organic material heated by the heating means is heated. A temperature sensor for measuring the temperature of the solvent-containing gas is provided, and a heating control device for operating the heating means so that the temperature measured by the temperature sensor is maintained within a set range is provided. Cleaning equipment for solvent contaminated soil.
性炭素繊維製吸着材を用いた溶剤回収装置において、前
記活性炭素繊維製吸着材を収容した吸着塔にガス配管を
接続するとともに、前記活性炭素繊維製吸着材を間にし
た前記ガス配管とは反対側で、有機溶剤を吸着した後の
ガスを排出可能に構成し、かつ、前記活性炭素繊維製吸
着材を間にして、吸着した有機溶剤を脱着する過熱水蒸
気を供給する蒸気供給管と、脱着した有機溶剤を回収す
る溶剤回収管とを接続して構成してある有機溶剤汚染土
壌の浄化処理装置。3. A solvent recovery apparatus using an activated carbon fiber adsorbent as the activated carbon fiber adsorbent according to claim 2, wherein a gas pipe is connected to the adsorption tower containing the activated carbon fiber adsorbent, and On the side opposite to the gas pipe with the activated carbon fiber adsorbent in between, the gas after adsorbing the organic solvent is configured to be able to be discharged, and the activated carbon fiber adsorbent is interposed and adsorbed. An apparatus for purifying organic solvent-contaminated soil, comprising a steam supply pipe for supplying superheated steam for desorbing an organic solvent and a solvent recovery pipe for recovering the desorbed organic solvent.
維製吸着材を収容した吸着塔を二個備え、両吸着塔に対
して、有機溶剤含有ガスを供給する溶剤吸着状態と、吸
着した有機溶剤を脱着する脱着状態とに背反的に切換え
る切換機構を備えて構成したものである有機溶剤汚染土
壌の浄化処理装置。4. The solvent recovery apparatus according to claim 3, comprising two adsorption towers containing an adsorbent made of activated carbon fiber, and a solvent adsorption state in which an organic solvent-containing gas is supplied to both adsorption towers, and an adsorption state. An apparatus for purifying soil contaminated with organic solvent, comprising a switching mechanism for switching between the desorbed state and the desorbed state of the organic solvent.
載の加熱制御装置によって制御する設定温度範囲が40〜
45℃である有機溶剤汚染土壌の浄化処理装置。5. The set temperature range controlled by the heating control device according to claim 2 is from 40 to 40.
Equipment for purification treatment of soil contaminated with organic solvents at 45 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3263233A JPH0576618A (en) | 1991-09-13 | 1991-09-13 | Purification processing method of earth polluted with organic solvent and purification processing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3263233A JPH0576618A (en) | 1991-09-13 | 1991-09-13 | Purification processing method of earth polluted with organic solvent and purification processing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0576618A true JPH0576618A (en) | 1993-03-30 |
Family
ID=17386632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3263233A Pending JPH0576618A (en) | 1991-09-13 | 1991-09-13 | Purification processing method of earth polluted with organic solvent and purification processing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0576618A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5496395A (en) * | 1993-12-28 | 1996-03-05 | Kureha Kagaku Kogyo Kabushiki Kaisha | System for recovering organic solvent in soil |
| JP2003225525A (en) * | 2002-01-31 | 2003-08-12 | Kobe Steel Ltd | Gas refining method and method for utilizing refined gas |
| JP2004249227A (en) * | 2003-02-20 | 2004-09-09 | Ishihara Sangyo Kaisha Ltd | Decomposing agent for organic compound and environmental decontaminating method using it |
| JP2005139259A (en) * | 2003-11-05 | 2005-06-02 | Osaka Gas Co Ltd | Active carbon treatment apparatus |
| JP2006159193A (en) * | 2005-12-15 | 2006-06-22 | Kobe Steel Ltd | Gas refining method and method for utilizing refined gas |
| JP2007000688A (en) * | 2005-06-21 | 2007-01-11 | Tsurui Chemical Co Ltd | Removal or detoxification apparatus of organic halogen compound |
| JP2011167625A (en) * | 2010-02-18 | 2011-09-01 | Morikawa Co Ltd | Apparatus and method for recovering solvent |
| JP2014188483A (en) * | 2013-03-28 | 2014-10-06 | Panasonic Corp | Soil gas purification device |
| CN110369481A (en) * | 2019-07-02 | 2019-10-25 | 南华大学上虞高等研究院有限公司 | A kind of reparation of uranium contaminated soil multistage pre-buried packet and its application method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS596924A (en) * | 1982-07-05 | 1984-01-14 | Kuraray Co Ltd | Recovery of organic solvent |
| JPS606626A (en) * | 1983-06-24 | 1985-01-14 | Toho Kako Kensetsu Kk | Recovery of low-boiling solvent |
| JPH03118083A (en) * | 1989-06-30 | 1991-05-20 | Leonhard Weiss Gmbh & Co | Process and apparatus for removing volatile mater from soil and material comparable thereto |
-
1991
- 1991-09-13 JP JP3263233A patent/JPH0576618A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS596924A (en) * | 1982-07-05 | 1984-01-14 | Kuraray Co Ltd | Recovery of organic solvent |
| JPS606626A (en) * | 1983-06-24 | 1985-01-14 | Toho Kako Kensetsu Kk | Recovery of low-boiling solvent |
| JPH03118083A (en) * | 1989-06-30 | 1991-05-20 | Leonhard Weiss Gmbh & Co | Process and apparatus for removing volatile mater from soil and material comparable thereto |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5496395A (en) * | 1993-12-28 | 1996-03-05 | Kureha Kagaku Kogyo Kabushiki Kaisha | System for recovering organic solvent in soil |
| JP2003225525A (en) * | 2002-01-31 | 2003-08-12 | Kobe Steel Ltd | Gas refining method and method for utilizing refined gas |
| JP2004249227A (en) * | 2003-02-20 | 2004-09-09 | Ishihara Sangyo Kaisha Ltd | Decomposing agent for organic compound and environmental decontaminating method using it |
| JP2005139259A (en) * | 2003-11-05 | 2005-06-02 | Osaka Gas Co Ltd | Active carbon treatment apparatus |
| JP2007000688A (en) * | 2005-06-21 | 2007-01-11 | Tsurui Chemical Co Ltd | Removal or detoxification apparatus of organic halogen compound |
| JP2006159193A (en) * | 2005-12-15 | 2006-06-22 | Kobe Steel Ltd | Gas refining method and method for utilizing refined gas |
| JP2011167625A (en) * | 2010-02-18 | 2011-09-01 | Morikawa Co Ltd | Apparatus and method for recovering solvent |
| JP2014188483A (en) * | 2013-03-28 | 2014-10-06 | Panasonic Corp | Soil gas purification device |
| CN110369481A (en) * | 2019-07-02 | 2019-10-25 | 南华大学上虞高等研究院有限公司 | A kind of reparation of uranium contaminated soil multistage pre-buried packet and its application method |
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