JP3499782B2 - Method and apparatus for removing trace organic compounds in water - Google Patents
Method and apparatus for removing trace organic compounds in waterInfo
- Publication number
- JP3499782B2 JP3499782B2 JP30422999A JP30422999A JP3499782B2 JP 3499782 B2 JP3499782 B2 JP 3499782B2 JP 30422999 A JP30422999 A JP 30422999A JP 30422999 A JP30422999 A JP 30422999A JP 3499782 B2 JP3499782 B2 JP 3499782B2
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- Prior art keywords
- water
- organic compounds
- exhaust gas
- combustion
- heat exchange
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- 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.)
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- Removal Of Specific Substances (AREA)
- Incineration Of Waste (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、地下水などに微量
に溶解している有機化合物を除去するための方法及び装
置に関する。TECHNICAL FIELD The present invention relates to a method and an apparatus for removing a trace amount of organic compounds dissolved in groundwater or the like.
【０００２】[0002]
【従来の技術】環境保全が大きな課題となっている。例
えば、ドライクリーニング用脱脂材、電子・金属工業用
洗浄液などに用いられる有機溶剤は、人体に有害である
有機化合物を含んでいる場合が多く、通常は何らかの無
害化処理を施した後、排出される。しかし、無処理のま
ま排出される場合もないとはいえず、それが、土壌・地
下水を汚染することが起こりうる。有害物質とされる有
機化合物の例としては、ベンゼンや有機塩素化合物（例
えば、トリクロロエチレン、テトラクロロエチレン、ト
リクロロエタン、四塩化炭素）などがあり、環境庁告示
の環境基準を有する物質も多い。地下水中のこの種の有
機化合物を除去する方法として、従来、活性炭による吸
着方法、触媒による分解・還元処理方法、紫外線による
分解処理方法、微生物による分解処理方法、などが提案
されている。2. Description of the Related Art Environmental protection has become a major issue. For example, organic solvents used in degreasing materials for dry cleaning, cleaning solutions for electronic and metal industries, etc. often contain organic compounds that are harmful to the human body, and are usually discharged after being subjected to some detoxification treatment. It However, it can be said that it will be discharged untreated, and it may pollute soil and groundwater. Examples of organic compounds regarded as harmful substances include benzene and organic chlorine compounds (eg, trichloroethylene, tetrachloroethylene, trichloroethane, carbon tetrachloride), and many of them have environmental standards announced by the Environmental Agency. As a method of removing this kind of organic compound in groundwater, conventionally, an adsorption method with activated carbon, a decomposition / reduction treatment method with a catalyst, a decomposition treatment method with ultraviolet rays, a decomposition treatment method with microorganisms, etc. have been proposed.
【０００３】活性炭吸着法は、地下水を例えば粒状化な
どにより表面積を大きくした活性炭と接触させて、地下
水中の有機化合物を活性炭に吸着させて除去するもので
あり、高い除去率が得られるが、活性炭の再生処理、取
り替えなどに手間がかかり、ランニングコストが高いな
どの不都合を有している。また、経時的に除去率が変化
するのを避けられない。触媒による分解・還元処理方法
は、特定の酸化分解用触媒などに気相に抽出した有機化
合物を接触させて無害化を図っているが（例えば、特開
平８−６９３号公報など参照）、活性炭吸着法の場合と
同様、触媒の取り替えなどに手間と費用がかかると共
に、触媒の劣化により除去率が変化する。The activated carbon adsorption method is a method in which ground water is brought into contact with activated carbon having a large surface area by, for example, granulation and the organic compounds in the ground water are adsorbed by the activated carbon to be removed, and a high removal rate can be obtained. It takes time and effort to regenerate and replace the activated carbon, and it has disadvantages such as high running cost. Further, it is unavoidable that the removal rate changes with time. In the decomposition / reduction treatment method using a catalyst, an organic compound extracted in a gas phase is brought into contact with a specific oxidative decomposition catalyst or the like to make it harmless (see, for example, JP-A-8-693). Similar to the adsorption method, it takes time and money to replace the catalyst, and the removal rate changes due to deterioration of the catalyst.
【０００４】紫外線による分解処理方法は、紫外線と光
触媒を用いて有機化合物を分解するものであるが、高コ
ストであるという不具合がある。微生物による分解処理
方法は、特定の微生物により特定の有機化合物を分解処
理しようとするものであるが（例えば、特開平２−９２
２７４号公報など参照）、地下水のように多種類の有機
化合物を含む可能性のあるものに対しては、高い処理効
果を期待することはできない。The decomposition treatment method using ultraviolet rays decomposes organic compounds by using ultraviolet rays and a photocatalyst, but has a drawback of high cost. A method for decomposing a microorganism is to decompose a specific organic compound by a specific microorganism (see, for example, JP-A-2-92).
No. 274, etc.), it is not possible to expect a high treatment effect for substances such as groundwater that may contain many kinds of organic compounds.
【０００５】他の方法として、有機塩素化合物を含む水
から有機塩素化合物を気相に抽出し、それをオイルと接
触させて有機塩素化合物をオイルに吸収させるようにし
た処理方法も提案されている（特開平５−５００９６号
公報参照）。有機塩素化合物を吸収したオイルを蒸発し
て有機塩素化合物を取り除くことにより、オイルを再利
用することができ、連続運転が可能となり、オイル交換
の手間が省けるなどランニングコストが低減する利点が
ある。しかし、オイルの加熱手段や蒸発した有機塩素化
合物を回収する手段など多くの付加設備を必要とする不
都合がある。As another method, a treatment method has been proposed in which an organic chlorine compound is extracted in a gas phase from water containing the organic chlorine compound and is brought into contact with oil so that the organic chlorine compound is absorbed by the oil. (See JP-A-5-50096). By evaporating the oil that has absorbed the organic chlorine compound to remove the organic chlorine compound, the oil can be reused, continuous operation becomes possible, and there is an advantage that running costs can be reduced, such as the need for oil replacement. However, there is a disadvantage that many additional facilities such as a heating means for oil and a means for recovering the evaporated organic chlorine compound are required.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、上記のよう
な従来技術の不都合を解消することを課題としており、
その目的は、高い除去率を維持した状態で長時間に亘る
連続運転が可能であり、部品交換なども不要なことから
ランニングコストも低く、かつ、多くの付加設備を要し
ないことから装置をコンパクト化できる水中微量有機化
合物の除去方法と装置を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned disadvantages of the prior art,
Its purpose is to enable continuous operation for a long time while maintaining a high removal rate, and because it does not require parts replacement, the running cost is low, and since many additional equipment is not required, the device is compact. An object of the present invention is to provide a method and a device for removing a trace amount of organic compounds in water that can be converted into water.
【０００７】[0007]
【課題を解決するための手段】上記の目的は、本発明に
よれば、基本的に、微量有機化合物を含む水から有機化
合物を気相に抽出し、抽出された有機化合物を空気と共
に燃焼させることを特徴とする水中微量有機化合物除去
方法、及び、微量有機化合物を含む水を汲み上げる手
段、汲み上げ水から有機化合物を気相に抽出する手段、
該抽出した気体を空気と共に燃焼させる手段とを少なく
とも備えることを特徴とする水中微量有機化合物除去装
置、により達成される。According to the present invention, the above object is basically to extract an organic compound from a water containing a trace amount of the organic compound into a gas phase, and burn the extracted organic compound with air. A method for removing a trace amount of organic compounds in water, and means for pumping water containing trace organic compounds, means for extracting an organic compound from the pumped water into a gas phase,
And a means for burning the extracted gas together with air, the apparatus for removing a trace amount of organic compounds in water.
【０００８】本発明によれば、地下水などに含まれる微
量の有機化合物は、気体（例えば、空気）と接触させる
ことにより、気相中に抽出される。抽出された有機化合
物を含む気体は、例えば都市ガスなどである燃料と混合
されて燃焼に付され、有機化合物の完全分解を達成す
る。例えば、
炭素と水素しか含まない化合物の場合は、
Ｃ−Ｈ＋空気 → ＣＯ2＋Ｈ2Ｏ
例：ベンゼン
Ｃ6Ｈ6＋７．５Ｏ2 → ６ＣＯ2＋３Ｈ2ＯAccording to the present invention, a trace amount of an organic compound contained in groundwater or the like is extracted into the gas phase by bringing it into contact with a gas (for example, air). The gas containing the extracted organic compound is mixed with a fuel such as city gas and subjected to combustion to achieve complete decomposition of the organic compound. For example, in the case of a compound containing only carbon and hydrogen, C-H + air → CO 2 + H 2 O Example: benzene C 6 H 6 + 7.5O 2 → 6CO 2 + 3H 2 O
【０００９】 炭素と水素、ハロゲン（Ｘ）を含む化
合物の場合は、
Ｃ−Ｈ−Ｘ＋空気＋Ｈ2Ｏ → ＣＯ2＋ＨＸ
例：トリクロロエチレン
Ｃ2ＨＣｌ3＋１．５Ｏ2＋Ｈ2Ｏ → ２ＣＯ2＋３ＨＣ
ｌ
例：テトラクロロエチレン
Ｃ2ＨＣｌ4＋Ｏ2＋２Ｈ2Ｏ → ２ＣＯ2＋４ＨＣｌIn the case of a compound containing carbon, hydrogen, and halogen (X), C—H—X + air + H 2 O → CO 2 + HX Example: trichlorethylene C 2 HCl 3 + 1.5O 2 + H 2 O → 2CO 2 + 3HC
Example: tetrachloroethylene C 2 HCl 4 + O 2 + 2H 2 O → 2CO 2 + 4HCl
【００１０】 炭素と水素、窒素を含む化合物の場合
は、
Ｃ−Ｈ−Ｎ＋空気＋Ｈ2Ｏ → ＣＯ2＋Ｈ2Ｏ＋ＮＯｘ
例：ピリジン
Ｃ5Ｈ11Ｎ＋６．７５Ｏ2 → ５ＣＯ2＋２．５Ｈ2Ｏ＋
ＮＯ
のように分解する。In the case of a compound containing carbon, hydrogen, and nitrogen, C—H—N + air + H 2 O → CO 2 + H 2 O + NOx Example: pyridine C 5 H 11 N + 6.75O 2 → 5CO 2 + 2.5H 2 O +
Decomposes like NO 2.
【００１１】地下水中に含まれる有機化合物の種類にも
よるが、もし、前記のように、炭素と水素しか含まな
い有機化合物の場合には、燃焼によって生じる燃焼排ガ
ス中の副生成物は炭酸ガスと水のみであり、燃焼排ガス
はそのまま大気に放出して差し支えない。有機化合物が
除去された処理済みの地下水はそのまま排水として棄て
ればよい。Depending on the type of organic compound contained in groundwater, if it is an organic compound containing only carbon and hydrogen as described above, the by-product in the combustion exhaust gas produced by combustion is carbon dioxide gas. And water, and the flue gas can be released to the atmosphere as it is. Treated groundwater from which organic compounds have been removed can be discarded as waste water.
【００１２】のように、炭素と水素の他に窒素を含む
有機化合物の場合は、燃焼排ガス中に副生成物としてＮ
Ｏｘが含まれる。処理すべき地下水中に含まれる有機化
合物は本来微量であり、副生成物としてのＮＯｘも微量
であることから、燃焼排ガスをそのまま大気に放出して
差し支えないが、必要に応じて、二段燃焼法などのよう
な従来知られたＮＯｘ処理を併用することもできる。有
機化合物が除去された処理済みの地下水もそのまま排水
として棄てればよい。As described above, in the case of an organic compound containing nitrogen in addition to carbon and hydrogen, N as a by-product in the combustion exhaust gas.
Ox is included. Since the amount of organic compounds contained in groundwater to be treated is essentially trace and NOx as a by-product is also trace, it is possible to release flue gas as it is to the atmosphere, but if necessary, two-stage combustion It is also possible to use a conventionally known NOx treatment such as a method. Treated groundwater from which organic compounds have been removed may be discarded as it is as wastewater.
【００１３】のように、ハロゲンを含む有機化合物
（例えば、トリクロロエチレン、テトラクロロエチレ
ン、トリクロロエタン、四塩化炭素など）のような場合
には、燃焼排ガス中に副生成物としてハロゲン化水素
（ＨＸ：例えば、ＨＣｌ）などの酸性物質が含まれるの
で、このままで大気に放出することは必ずしも好ましく
ない。従って、本発明での好ましい態様では、抽出され
た有機化合物を燃焼させた燃焼排ガスはスクラバーを通
過させることとし、そこでＨＸなどの酸性物質を吸収さ
せて燃焼排ガスを無害化した後、大気に放出するように
している。In the case of an organic compound containing halogen (eg, trichloroethylene, tetrachloroethylene, trichloroethane, carbon tetrachloride, etc.), hydrogen halide (HX: eg HCl as a by-product in the combustion exhaust gas is used. ) And other acidic substances are included, it is not always preferable to release them to the atmosphere as they are. Therefore, in a preferred embodiment of the present invention, the combustion exhaust gas obtained by burning the extracted organic compound is allowed to pass through the scrubber, where an acidic substance such as HX is absorbed to make the combustion exhaust gas harmless and then released to the atmosphere. I am trying to do it.
【００１４】スクラバーの形態は燃焼後の副生成物の種
類に応じて適宜選択すればよく、噴霧式などのようなも
のであってもよいが、通常の地下水処理においては、水
と燃焼排ガスを接触させるだけの形態のもので十分であ
る。燃焼排ガスが水と接触することにより、ＨＸなどの
酸性物質は水に吸収され、燃焼排ガスは無害化される。
なお、スクラバーでの処理水として、曝気処理して有機
化合物を分離した後の水を用いることは、装置の構成及
び循環サイクルを簡素化できることから、好ましい態様
である。スクラバーから出る処理水にはＨＸなどの酸性
物質が微量含まれるが、通常は濃度が低いことから、そ
のままを放出しても問題はない。もし、処理水のｐＨが
下水への排出基準値範囲を外れることが予想されるよう
な場合には、従来知られた通常の中和装置を通した後に
排出する。The form of the scrubber may be appropriately selected according to the type of by-products after combustion, and may be of a spray type or the like, but in the normal groundwater treatment, water and combustion exhaust gas are used. It is sufficient to use the form of contact. When the combustion exhaust gas comes into contact with water, acidic substances such as HX are absorbed by the water, and the combustion exhaust gas is rendered harmless.
The use of water after aeration treatment to separate organic compounds as the treated water in the scrubber is a preferable mode because the configuration of the apparatus and the circulation cycle can be simplified. Although the treated water discharged from the scrubber contains a trace amount of an acidic substance such as HX, its concentration is usually low, so there is no problem in discharging it as it is. If the pH of the treated water is expected to be out of the standard discharge range for sewage, the treated water is discharged after passing through a conventionally known ordinary neutralization device.
【００１５】真空ポンプなどを利用して汲み上げた地下
水から有機化合物を気相に抽出する手段は任意であり、
シャワー型、気泡型などの従来知られた曝気処理装置
は、使用の簡便性の観点から特に有効である。その際
に、好ましくは、曝気処理装置での抽出効率を高めるた
めに、汲み上げ水は加熱される。加熱手段は任意である
が、装置全体の熱効率を良くするために、汲み上げた水
と前記した抽出された有機化合物を燃焼させた燃焼排ガ
スとの間で熱交換を行うことは、好ましい態様である。
この様な熱交換処理により、気液分離速度を速めること
ができ、結果として、液層タンク（例えば、曝気処理器
での）の小型化が可能となり、また、曝気処理器へ空気
を送り込むブロワーの能力も小型化でき、装置全体もコ
ンパクト化する。Any means can be used to extract the organic compound into the gas phase from the groundwater pumped up using a vacuum pump or the like.
The conventionally known aeration treatment devices such as shower type and bubble type are particularly effective from the viewpoint of ease of use. At that time, preferably, the pumped water is heated in order to enhance the extraction efficiency in the aeration treatment device. Although the heating means is optional, in order to improve the thermal efficiency of the entire apparatus, it is a preferable embodiment to perform heat exchange between the pumped water and the flue gas in which the extracted organic compound is burned. .
By such heat exchange treatment, the gas-liquid separation speed can be increased, and as a result, the liquid layer tank (for example, in the aeration processor) can be downsized, and the blower that sends air to the aeration processor. The capacity of can be downsized, and the entire device can be downsized.
【００１６】地下水中から抽出された有機化合物を空気
と共に燃焼させるための燃焼用燃料に特に制限はなく、
気体燃料、液体燃料、固体燃料など任意である。しか
し、有機化合物が分散している空気の全量を短時間で燃
焼場に曝すことが必要であることを考慮すると、気体燃
料を用いることが好ましく、入手の容易性から都市ガス
を燃焼用燃料として用いることは推奨される。また、液
体燃料や固体燃料を用いる場合には、適宜の手段によ
り、それをアトマイズ（微粒子化）して、さらには、気
体状態として用いることが推奨される。There is no particular limitation on the combustion fuel for burning the organic compound extracted from groundwater with air.
It is optional such as gas fuel, liquid fuel, and solid fuel. However, considering that it is necessary to expose the entire amount of air in which the organic compound is dispersed to the combustion field in a short time, it is preferable to use a gas fuel, and city gas is used as a combustion fuel because it is easily available. Use is recommended. Further, when using a liquid fuel or a solid fuel, it is recommended to atomize (atomize) it by an appropriate means and use it in a gas state.
【００１７】[0017]
【発明の実施の形態】以下、本発明の好適な実施の形態
を図面を参照して説明する。図１は本発明による水中微
量有機化合物除去装置の全体を示す模式的構成図であ
る。地下水Ｗに達する汲み上げ管１の途中に吸い上げポ
ンプ２が配置してあり、汲み上げられた地下水Ｗは、熱
交換器３を通過して、曝気処理器４に送り込まれる。な
お、汲み上げ管１は、地下水のみならず、工場からの排
水路など有機化合物が混入していると思われる適宜の水
路に配置されてもよい。BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an entire apparatus for removing a trace amount of organic compounds in water according to the present invention. A suction pump 2 is arranged in the middle of the pumping pipe 1 that reaches the groundwater W, and the pumped groundwater W passes through the heat exchanger 3 and is sent to the aeration processor 4. The pumping pipe 1 may be arranged not only in groundwater but also in an appropriate water channel such as a drainage channel from a factory where organic compounds are considered to be mixed.
【００１８】曝気処理器４は、この例ではエアレーショ
ンによる曝気処理であり、汲み上げられた地下水Ｗは上
方から曝気処理器４内に投入され、ブロワー５からの空
気が下方から吹き込まれる。地下水Ｗは吹き込まれる空
気と接することとなり、もし、地下水中に例えば有機塩
素化合物のような有機化合物が混入している場合には、
曝気処理を受けて、有機化合物は水中から追い出され、
空気中に抽出される。In this example, the aeration processing unit 4 is an aeration process by aeration, and the ground water W pumped up is put into the aeration processing unit 4 from above, and the air from the blower 5 is blown from below. The groundwater W comes into contact with the blown air, and if the groundwater contains an organic compound such as an organic chlorine compound,
Following the aeration process, organic compounds are expelled from the water,
Extracted into the air.
【００１９】抽出された有機化合物を含む空気は、曝気
処理器４を出て管路６を通過しバーナ７にいたる。管路
６は分岐管８を有し、該分岐管８から都市ガスなどの燃
料が供給される。抽出された有機化合物を含む空気と燃
料である都市ガスの予混合体はバーナ７で燃焼する。予
混合燃焼であることにより、空気の全量を確実に燃焼に
参加させることが容易となる。供給する燃料量は有機化
合物を含む空気の流量を考慮して完全燃焼が進行する量
とする。The air containing the extracted organic compound exits the aeration processor 4 and passes through the pipe line 6 to reach the burner 7. The pipeline 6 has a branch pipe 8 from which fuel such as city gas is supplied. The premixture of the air containing the extracted organic compounds and the city gas as the fuel is burned in the burner 7. Premixed combustion facilitates ensuring that all of the air participates in combustion. The amount of fuel to be supplied is an amount that allows complete combustion to proceed in consideration of the flow rate of air containing organic compounds.
【００２０】燃焼により、抽出された有機化合物は完全
に分解し、有機化合物の種類に応じて、炭酸ガス、水、
窒素酸化物、ハロゲン化水素などに変化する。通常、地
下水中に溶解している有機化合物は不特定物質であり、
窒化物やハロゲン化合物を含むことを否定できない。従
って、この例では、燃焼後の燃焼排ガスの全量をスクラ
バー９に送り込み、ハロゲン化水素（ＨＸ）などの大気
放出を防ぐと共に、ＮＯｘについては、例えば、水に溶
かして硝酸に変化させるなどの手段を施すことにより、
大気への放出を防いでいる。Upon combustion, the extracted organic compound is completely decomposed, and carbon dioxide gas, water,
Change to nitrogen oxides, hydrogen halides, etc. Usually, organic compounds dissolved in groundwater are unspecified substances,
It cannot be denied that it contains nitrides and halogen compounds. Therefore, in this example, the total amount of the combustion exhaust gas after combustion is sent to the scrubber 9 to prevent the release of hydrogen halide (HX) and the like into the atmosphere, and the NOx is converted into nitric acid by dissolving it in water, for example. By applying
Prevents its release into the atmosphere.
【００２１】さらに、燃焼排ガスは高い熱エネルギーを
持っているので、その熱エネルギーの有効利用も図って
いる。すなわち、バーナ７からの燃焼排ガスは管路１０
を経て、前記した熱交換器３に流入し、そこで汲み上げ
ポンプ２で汲み上げられた地下水Ｗと熱交換を行い、地
下水Ｗを昇温（通常、１００℃以下）させている。この
熱交換によって地下水Ｗが加熱されることにより、曝気
処理器４での気液分離速度を速めることができ、結果と
して、曝気処理器４の小型化が可能となり、また、曝気
処理器４へ空気を送り込むブロワー５の能力も小型化で
き、装置全体のコンパクト化が可能となる。Further, since the combustion exhaust gas has a high heat energy, the heat energy is also effectively utilized. That is, the combustion exhaust gas from the burner 7 is supplied to the conduit 10
After passing through the heat exchanger 3, heat is exchanged with the groundwater W pumped by the pump 2 and the temperature of the groundwater W is raised (usually 100 ° C. or lower). By heating the groundwater W by this heat exchange, the gas-liquid separation speed in the aeration treatment device 4 can be increased, and as a result, the aeration treatment device 4 can be downsized, and the aeration treatment device 4 can be further reduced. The capacity of the blower 5 that sends in air can also be reduced, and the overall size of the device can be reduced.
【００２２】熱交換器３を出た燃焼排ガスは管路１１を
経て、前記したスクラバー９に流入する。この例でスク
ラバー９は水と燃焼排ガスとを接触させる形態のもので
あり、処理水Ｗａとして、発揮処理器４で有機化合物を
分離した処理後の地下水Ｗを管路１２を介して取り込ん
でいる。処理後の地下水はスクラバー９内で燃焼排ガス
と接触し、燃焼排ガス中の酸性物質（ハロゲン化水素な
ど）などを取り込み、燃焼排ガスを無害化する。無害化
された燃焼排ガスはスクラバー９から大気に放出され
る。The flue gas discharged from the heat exchanger 3 flows into the scrubber 9 through the pipe 11. In this example, the scrubber 9 is of a form in which water and combustion exhaust gas are brought into contact with each other, and as the treated water Wa, the groundwater W after the treatment in which the organic compound is separated in the exhibitor 4 is taken in through the pipe 12. . The groundwater after the treatment comes into contact with the combustion exhaust gas in the scrubber 9, takes in an acidic substance (hydrogen halide, etc.) in the combustion exhaust gas, and renders the combustion exhaust gas harmless. The detoxified combustion exhaust gas is released from the scrubber 9 to the atmosphere.
【００２３】スクラバー９での処理水Ｗａは、ハロゲン
化水素などの酸性物質が微量含まれる可能性が高い。し
かし、通常は濃度が低いことから、そのままを地中に下
水として放出しても問題はない。もし、処理水のｐＨが
下水への排出基準値範囲を外れることが予想されるよう
な場合には、従来知られた通常の中和装置（不図示）を
通した後に、排出する。The treated water Wa in the scrubber 9 is highly likely to contain a trace amount of an acidic substance such as hydrogen halide. However, since the concentration is usually low, there is no problem if it is discharged into the ground as sewage. If the pH of the treated water is expected to be out of the discharge standard value range for sewage, it is discharged after passing through a conventionally known ordinary neutralization device (not shown).
【００２４】上記の例では、処理水すべきものとして地
下水を取り上げているが、土中に含浸している水を適宜
の手段により吸引して、それを処理水とすることも可能
であり、また、前記のように工場廃液の排水路などから
直接取り込んで処理水としてもよい。また、熱交換器３
と曝気処理器４とを別個に設け、管路により両者を連結
しているが、図示しないが熱交換器３を曝気処理器４内
に組み込んでしまうことも可能であり、装置をよりコン
パクト化できる。In the above example, groundwater is taken as the one to be treated, but it is also possible to suck the water impregnated in the soil by an appropriate means and use it as the treated water. As described above, the treated water may be directly taken in from the drainage channel of the factory waste liquid. Also, the heat exchanger 3
Although the aeration treatment device 4 and the aeration treatment device 4 are separately provided and connected to each other by a pipeline, the heat exchanger 3 can be incorporated in the aeration treatment device 4 (not shown), and the apparatus can be made more compact. it can.
【００２５】また、上記の説明では、バーナ７からの燃
焼排ガスの全量が熱交換器３を通過するものとして説明
したが、図に示すように、管路１０にバイパス路１２と
流量制御弁１３とを設け、熱交換器３への燃焼排ガスの
流量を制御できるようにしてもよい。このようにするこ
とにより、熱収支バランスを可変とすることができ、そ
れにより、汲み上げ水の温度上昇を調整して、曝気処理
器４内で汲み上げ水が沸騰し、有機化合物を含む空気に
水蒸気が混入して、その結果、バーナ７での燃焼に不調
が生じる（例えば、不完全燃焼となる）ような事態を確
実に回避することができる。Further, in the above explanation, it was explained that the total amount of the combustion exhaust gas from the burner 7 passes through the heat exchanger 3, but as shown in the figure, the bypass passage 12 and the flow control valve 13 are provided in the pipe passage 10. May be provided so that the flow rate of the combustion exhaust gas to the heat exchanger 3 can be controlled. By doing so, the heat balance balance can be made variable, whereby the temperature rise of the pumped water is adjusted, the pumped water boils in the aeration processor 4, and the steam containing the organic compounds contains steam. It is possible to reliably avoid a situation in which the fuel is mixed, and as a result, combustion in the burner 7 becomes disordered (for example, incomplete combustion).
【００２６】[0026]
【発明の効果】上記のように、本発明によれば、地下水
などに含まれる有機化合物の処理を適切に行うことがで
き、従来の方法と比較して、活性炭の取り替えなどの作
業が不要であることから、メンテナンスフリーで長時間
の連続運転が可能となり、装置も簡素化かつコンパクト
化でき、ランニングコストの低減化が可能となる。As described above, according to the present invention, it is possible to properly treat the organic compounds contained in groundwater and the like, and there is no need to replace activated carbon as compared with the conventional method. Therefore, maintenance-free operation can be performed for a long time, the apparatus can be simplified and downsized, and the running cost can be reduced.
【図１】本発明による水中微量有機化合物除去装置の全
体を示す模式的構成図。FIG. 1 is a schematic configuration diagram showing an entire apparatus for removing a trace amount of organic compounds in water according to the present invention.
Ｗ…地下水、２…汲み上げポンプ、３…熱交換器、４…
曝気処理器、５…ブロワー、７…バーナ、８…燃料ガス
導入管路、９…スクラバーW ... Groundwater, 2 ... Pumping pump, 3 ... Heat exchanger, 4 ...
Aeration processor, 5 ... Blower, 7 ... Burner, 8 ... Fuel gas introduction line, 9 ... Scrubber
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭48−53560（ＪＰ，Ａ) 特開 昭62−4489（ＪＰ，Ａ) 特開 平８−81890（ＪＰ，Ａ) 特開 平８−243544（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) F23G 7/00 - 7/06 C02F 1/20 C02F 1/58 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-48-53560 (JP, A) JP-A-62-4489 (JP, A) JP-A-8-81890 (JP, A) JP-A-8- 243544 (JP, A) (58) Fields surveyed (Int.Cl. 7 , DB name) F23G 7/ 00-7/06 C02F 1/20 C02F 1/58
Claims (5)
処理して有機化合物を気相に抽出し、抽出された有機化
合物を空気と共に燃焼させることにより水中微量有機化
合物を除去する方法であって、抽出された有機化合物を燃焼させた燃焼排ガスと前記微
量有機化合物を含む水とを熱交換させる工程と 、抽出された有機化合物を燃焼させた燃焼排ガスをスクラ
バーを通過させた後に大気に放出する工程と 、をさらに含む ことを特徴とする水中微量有機化合物除去
方法。1. Water-containing trace organic compounds are aged and then aerated to extract the organic compounds into a gas phase, and the extracted organic compounds are burnt together with air to become trace organic compounds in water.
A method for removing a compound, which comprises the combustion exhaust gas obtained by burning the extracted organic compound and
A step of exchanging heat with water containing a large amount of organic compounds and a scrubbing of the flue gas produced by burning the extracted organic compounds.
The method for removing a trace amount of organic compounds in water , further comprising the step of releasing the compound into the air after passing through the bar .
して有機化合物を分離した後の水を用いることを特徴と
する請求項１に記載の水中微量有機化合物除去方法。2. The method for removing a trace amount of organic compounds in water according to claim 1, wherein water after aeration treatment to separate organic compounds is used as the treated water in the scrubber.
排ガスと前記微量有機化合物を含む水とを熱交換させる
工程の前工程として、熱交換に関与する燃焼排ガスの流
量を制御する工程をさらに含むことを特徴とする請求項
１又は２に記載の水中微量有機化合物除去方法。3. Combustion of burning extracted organic compounds
Heat exchange between exhaust gas and water containing the trace organic compounds
As a pre-step of the process, the flow of flue gas involved in heat exchange
The method of claim 1, further comprising the step of controlling the quantity.
The method for removing trace organic compounds in water according to 1 or 2 .
段、汲み上げ水を熱交換により加熱する熱交換手段、熱
交換手段により加熱された汲み上げ水に空気を吹き付け
て汲み上げ水に含まれる有機化合物を気相に抽出する手
段、該抽出した徴量有機化合物を空気と共に燃焼させる
手段、該燃焼手段からの燃焼排ガスを前記熱交換手段に
導入する手段、及び、該燃焼手段からの燃焼排ガスと水
とを接触させて燃焼排ガス中の水溶性物質を水に溶解さ
せる手段、とを少なくとも備えることを特徴とする水中
微量有機化合物除去装置。4. A means for drawing up water containing a trace amount of organic compounds, a heat exchange means for heating the drawn water by heat exchange, and heat.
A means for blowing air to the pumped water heated by the exchange means to extract an organic compound contained in the pumped water into a gas phase, a means for burning the extracted organic compound with air, and a combustion exhaust gas from the combustion means. For the heat exchange means
An apparatus for removing a trace amount of organic compounds in water, which comprises at least a means for introducing and a means for bringing a combustion exhaust gas from the combustion means into contact with water to dissolve a water-soluble substance in the combustion exhaust gas in water.
換手段に導入する手段は、さらに、熱交換手段に流入す
る燃焼排ガスの量を制御する手段を備えることを特徴と
する請求項４に記載の水中微量有機化合物除去装置。 5. The combustion exhaust gas from the combustion means is used for the heat exchange.
The means for introducing into the heat exchange means further flows into the heat exchange means.
And a means for controlling the amount of combustion exhaust gas.
The trace amount organic compound removing device in water according to claim 4 .
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30422999A JP3499782B2 (en) | 1999-10-26 | 1999-10-26 | Method and apparatus for removing trace organic compounds in water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30422999A JP3499782B2 (en) | 1999-10-26 | 1999-10-26 | Method and apparatus for removing trace organic compounds in water |
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| JP2001124323A JP2001124323A (en) | 2001-05-11 |
| JP3499782B2 true JP3499782B2 (en) | 2004-02-23 |
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| CN102452692B (en) * | 2010-10-22 | 2013-02-27 | 清华大学 | Aeration blowing method in case of sudden volatile halogenated alkane organic substance pollution of drinking water |
| CN102367187B (en) * | 2011-04-28 | 2013-03-27 | 华东理工大学 | Chlorinated hydrocarbon-polluted underground water blowing oxidation and tail gas treatment process |
| JP5836203B2 (en) * | 2012-06-14 | 2015-12-24 | 株式会社昭和 | Treatment method of soil contaminated water with photocatalytic material |
| JP2014069162A (en) * | 2012-10-01 | 2014-04-21 | Shimizu Corp | Purification treatment system of polluted under ground water |
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