JPH09239371A - Treatment of ethanolamine-containing waste dilute hydrochloric acid - Google Patents
Treatment of ethanolamine-containing waste dilute hydrochloric acidInfo
- Publication number
- JPH09239371A JPH09239371A JP8080798A JP8079896A JPH09239371A JP H09239371 A JPH09239371 A JP H09239371A JP 8080798 A JP8080798 A JP 8080798A JP 8079896 A JP8079896 A JP 8079896A JP H09239371 A JPH09239371 A JP H09239371A
- Authority
- JP
- Japan
- Prior art keywords
- ethanolamine
- hydrochloric acid
- dilute hydrochloric
- waste liquid
- treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Removal Of Specific Substances (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、エタノールアミン
含有希塩酸廃液の処理法に関し、詳しくは電解処理によ
り希薄塩酸廃液中のエタノールアミンを効率的に酸化分
解して除去するエタノールアミン含有希塩酸廃液の処理
法に関する。TECHNICAL FIELD The present invention relates to a method for treating a dilute hydrochloric acid waste liquid containing ethanolamine, and more particularly to a treatment of a dilute hydrochloric acid waste liquid containing ethanolamine for efficiently oxidizing and removing ethanolamine in the dilute hydrochloric acid waste liquid by electrolytic treatment. Concerning the law.
【０００２】[0002]
【従来の技術】原子力発電や火力発電の復水工程では、
冷却効率を高めるためエタノールアミンを含有する希塩
酸を使用することが公知である。この使用済廃液は高濃
度の化学的酸素要求量（ＣＯＤ）を含んでおり、そのま
ま処理することなく流出廃棄することはできない。その
ため、この廃液は、従来、微生物を利用するいわゆる活
性汚泥法またはオゾンを使用する化学酸化法で処理する
のが一般であった。2. Description of the Related Art In the condensing process of nuclear power generation and thermal power generation,
It is known to use dilute hydrochloric acid containing ethanolamine to increase cooling efficiency. This spent effluent contains a high concentration of chemical oxygen demand (COD) and cannot be effluent discarded without treatment. Therefore, conventionally, this waste liquid has generally been treated by a so-called activated sludge method using microorganisms or a chemical oxidation method using ozone.
【０００３】[0003]
【発明が解決しようとする課題】しかし、発明者らによ
れば、従来の活性汚泥法を用いる処理では、下記の問題
があること知見された。即ち、（１）活性汚泥法で処理
するためには塩濃度を希薄にする必要があり、廃液をそ
のまま処理することができず希釈して処理することが通
常であることから、処理液量が増大となり大規模な設備
が必要であること、また、（２）活性汚泥法は処理にお
いては水分を多量に含有する汚泥を生成し、その汚泥を
そのまま廃棄することは新たな環境上の問題を生じさせ
ることになるため、生成汚泥の処理が必要となること、
更に（３）活性汚泥法で処理するためには廃液に微生物
の栄養源を添加する必要があり、運転経費が嵩む等の問
題がある。また、従来のオゾンを用いる処理では下記の
問題のあることが知見された。即ち、（１）オゾンは廃
液中の有機物と選択的に反応せず、自己分解反応や塩化
物イオンと反応するといった目的以外の副反応が起こり
やすいこと、また、（２）オゾンを生成する無声放電方
式は電流効率が低く、オゾンを製造するのに大量の電力
が必要なため、運転経費が嵩むこと等である。発明者ら
は、上記エタノールアミン含有希塩酸廃液の従来の活性
汚泥法及びオゾン酸化法による処理の問題に鑑み、活性
汚泥、オゾンを用いることなく、簡便に、安価に、且
つ、効率よくエタノールアミンを除去する方法を新たに
見出すことを目的に鋭意検討した。その結果、エタノー
ルアミンが電解により酸化分解すること、また電解を隔
膜のない同一電解室に陽極及び陰極を配置して行うこと
により効果的な酸化が行われることを見出し、本発明に
到達した。However, the present inventors have found that the treatment using the conventional activated sludge method has the following problems. That is, (1) it is necessary to dilute the salt concentration for treatment by the activated sludge method, and since the waste liquid cannot be treated as it is and is usually diluted, the amount of treatment liquid is The number of facilities will be increased, and large-scale equipment will be required. (2) The activated sludge method produces sludge containing a large amount of water in the treatment, and discarding the sludge as it is creates a new environmental problem. Since it will be generated, it will be necessary to treat the generated sludge,
Further, (3) it is necessary to add a nutrient source of microorganisms to the waste liquid for the treatment by the activated sludge method, which causes a problem that operating cost increases. Further, it was found that the conventional treatment using ozone has the following problems. That is, (1) ozone does not selectively react with organic substances in the waste liquid, and side reactions other than the purpose such as self-decomposition reaction and chloride ion reactions easily occur, and (2) silent generation of ozone. The discharge method is low in current efficiency and requires a large amount of electric power to produce ozone, resulting in high operating cost. In view of the problems of the conventional activated sludge method and ozone oxidation method for treating the ethanolamine-containing dilute hydrochloric acid waste solution, the inventors of the present invention can easily, inexpensively, and efficiently produce ethanolamine without using activated sludge and ozone. The inventors have made earnest studies for the purpose of finding out a new method of removing. As a result, they have found that ethanolamine is oxidatively decomposed by electrolysis, and that effective oxidation is performed by performing electrolysis by disposing an anode and a cathode in the same electrolysis chamber without a diaphragm, and has reached the present invention.
【０００４】[0004]
【課題を解決するための手段】本発明によれば、エタノ
ールアミン含有希塩酸廃液を、微酸性で無隔膜電解処理
してエタノールアミンを除去することを特徴とするエタ
ノールアミン含有希塩酸廃液の処理法が提供される。本
発明のエタノールアミン含有希塩酸廃液の処理法におい
て、前記微酸性がｐＨ５〜７であることが好ましい。ま
た、前記電解処理が、無隔膜電解室にエタノールアミン
含有希塩酸廃液を循環供給して連続的に行なわれること
が好ましい。According to the present invention, there is provided a method for treating dilute hydrochloric acid waste solution containing ethanolamine, which comprises subjecting dilute hydrochloric acid waste solution containing ethanolamine to electrolytic membrane-less electrolytic treatment to remove ethanolamine. Provided. In the method for treating a dilute hydrochloric acid waste solution containing ethanolamine of the present invention, it is preferable that the slightly acidic pH is 5 to 7. Further, it is preferable that the electrolytic treatment is continuously carried out by circulating and supplying a dilute hydrochloric acid waste solution containing ethanolamine to the diaphragmless electrolysis chamber.
【０００５】本発明は、上記のように構成され、エタノ
ールアミンを含有する希塩酸廃液を微酸性で無隔膜電解
処理することにより、陽極においてエタノールアミンが
電解酸化されると同時に、希塩酸廃液中からの塩素分が
酸化されて生じる次亜塩素酸イオンにより化学的にも酸
化されることから、コンパクトな装置でエタノールアミ
ン含有塩酸廃液から簡便且つ効率的にエタノールアミン
を分解除去することができる。しかも、分解により生成
する炭酸ガス、水、窒素ガスは、いずれもそのまま放出
することができ二次的な追加処理も不要であり、活性汚
泥法やオゾン酸化法に比し設備費及びランニングコスト
の削減が著しく、工業的実用性に優れるものである。According to the present invention, the dilute hydrochloric acid waste liquid containing ethanolamine is electrolyzed at the anode at the same time by electrolytically treating the dilute hydrochloric acid waste liquid containing ethanolamine with a slight acidity, and at the same time, the dilute hydrochloric acid waste liquid is removed from the dilute hydrochloric acid waste liquid. Since the chlorine content is chemically oxidized by the hypochlorite ion generated by the oxidation, ethanolamine can be easily and efficiently decomposed and removed from the ethanolamine-containing hydrochloric acid waste liquid with a compact device. Moreover, carbon dioxide gas, water, and nitrogen gas generated by decomposition can be released as they are without secondary additional treatment, which requires less equipment cost and running cost than the activated sludge method and ozone oxidation method. The reduction is remarkable, and the industrial practicality is excellent.
【０００６】[0006]
【発明の実施の形態】以下、本発明について詳細に説明
する。本発明において、被電解エタノールアミン含有廃
液は、微酸性状態で無隔膜で電解処理される。例えば、
発電所の復水工程から排出される廃液には、５〜７重量
％の塩酸と１〜２重量％のエタノールアミンが含まれ、
通常、ｐＨ値が約０以下の強酸性を呈している。この酸
性廃液をそのまま電解処理した場合は、電解時に塩素ガ
スが発生し、その塩素ガス処理対策を要する。また、電
解処理装置の各種機材を著しく腐食するおそれがある。
これらを防止するため、被電解処理廃液を微酸性状態で
電解処理することにより、電解処理を長期間に亘り安定
させることができ、且つ、後処理や機材の腐食防止や腐
食による交換等の設備費の増大を防止することができ
る。上記したように、本発明において、例えば発電所の
復水工程からの酸性状態のエタノールアミン含有希塩酸
廃液は、電解処理に先立ち、予め微酸性とする。本発明
において、微酸性化は、一般に、アルカリ化合物を添加
して約ｐＨ５〜７に中和した状態であり、より好ましく
はｐＨ６〜７とするのがよい。被電解処理廃液のｐＨ値
が５未満の場合は、電解中に塩素ガスが多く発生し、後
処理が必要になるので好ましくない。一方、ｐＨ値が７
より高い場合は、エタノールアミンの一部が気体となっ
て電解槽外に排出されるため好ましくない。また、被処
理廃液を微酸性状態として電解処理するに従い電解室内
での液ｐＨが下がる傾向があり、微酸性を保持するため
に電解時に適宜アルカリ化合物を添加してｐＨ５〜７の
範囲となるようにする。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below. In the present invention, the electrolyzed ethanolamine-containing waste liquid is subjected to electrolytic treatment without a diaphragm in a slightly acidic state. For example,
The waste liquid discharged from the condensing process of the power plant contains 5 to 7% by weight of hydrochloric acid and 1 to 2% by weight of ethanolamine,
Usually, it exhibits strong acidity with a pH value of about 0 or less. When this acidic waste liquid is directly electrolyzed, chlorine gas is generated during electrolysis, and the chlorine gas treatment measure is required. In addition, various components of the electrolytic treatment device may be significantly corroded.
In order to prevent these, by electrolyzing the electrolyzed waste liquid in a slightly acidic state, it is possible to stabilize the electrolysis for a long period of time, and also to provide post-treatment, equipment corrosion prevention, equipment replacement for corrosion, etc. It is possible to prevent an increase in cost. As described above, in the present invention, for example, the acidified ethanolamine-containing dilute hydrochloric acid waste liquid from the condensing step of the power plant is made slightly acidic before the electrolytic treatment. In the present invention, slight acidification is generally a state in which an alkaline compound is added to neutralize the pH to about 5 to 7, and more preferably pH 6 to 7. If the pH value of the waste liquid to be electrolyzed is less than 5, a large amount of chlorine gas is generated during electrolysis, which requires post-treatment, which is not preferable. On the other hand, the pH value is 7
If it is higher, a part of ethanolamine becomes gas and is discharged to the outside of the electrolytic cell, which is not preferable. Further, as the waste liquid to be treated is subjected to electrolytic treatment in a slightly acidic state, the liquid pH in the electrolysis chamber tends to decrease, so that an alkaline compound is appropriately added at the time of electrolysis to maintain the slightly acidic so that the pH is in the range of 5 to 7. To
【０００７】本発明において、微酸性化のために添加す
るアルカリ化合物としては、苛性ソーダ等のナトリウム
化合物を用いて中和することが好ましい。希塩酸廃液中
に苛性ソーダを添加することにより、廃液中に塩化ナト
リウム（ＮａＣｌ）を生成することができる。ＮａＣｌ
含有電解液の無隔膜での電解は、酸化力の強い次亜塩素
酸イオンを生成させることができる。本発明のエタノー
ルアミン含有希塩酸廃液の電解処理は無隔膜で行われ、
エタノールアミンを電解酸化分解できると共に、微酸性
化の中和で生じるＮａＣｌから生成する次亜塩素酸イオ
ンによってもエタノールアミンを酸化分解することがで
き特に好ましい。電解処理において隔膜を使用した場合
は次亜塩素酸及び次亜塩素酸ソーダの生成が困難となり
好ましくない。上記のように、本発明は希塩酸廃液中の
エタノールアミンを次亜塩素酸イオンの酸化作用と電解
酸化の双方により効果的に分解除去することができる。
希塩酸廃液中のエタノールアミンを電解処理して除去す
ることは、本発明により初めて提案されたものである。
更に、電解処理時の電解液を微酸性しＮａＣｌを共存さ
せて電解することにより効果的なエタノールアミンの除
去が好適に行うことができることも、従来は全く知られ
ておらず、発明者らが初めて見いだしたことである。In the present invention, it is preferable to neutralize with a sodium compound such as caustic soda as the alkali compound added for slight acidification. By adding caustic soda to the dilute hydrochloric acid waste liquid, sodium chloride (NaCl) can be produced in the waste liquid. NaCl
The electrolysis of the contained electrolytic solution in a membrane-free manner can generate hypochlorite ions having strong oxidizing power. The electrolytic treatment of the dilute hydrochloric acid waste solution containing ethanolamine of the present invention is performed without a diaphragm,
It is particularly preferable that ethanolamine can be electrolytically oxidatively decomposed, and that ethanolamine can also be oxidatively decomposed by hypochlorite ion generated from NaCl generated by neutralization of slight acidification. When a diaphragm is used in the electrolytic treatment, it is not preferable because the formation of hypochlorous acid and sodium hypochlorite is difficult. As described above, the present invention can effectively decompose and remove ethanolamine in dilute hydrochloric acid waste liquid by both the oxidizing action of hypochlorite ion and electrolytic oxidation.
The electrolytic removal of ethanolamine in dilute hydrochloric acid waste liquid was first proposed by the present invention.
Furthermore, it has not been known at all in the past that the effective removal of ethanolamine can be suitably carried out by electrolyzing the electrolytic solution at the time of electrolytic treatment in a slightly acidic manner to cause NaCl to coexist. This is the first time I found it.
【０００８】本発明で使用する電解処理装置は、その型
式は特に制限されるものでなく、タンク式電解槽やフィ
ルタープレス式電解槽が使用できる。タンク式としては
箱型や円筒型のものが好適に使用される。また、本発明
の電解処理装置における電極の接続法は、複極式及び単
極式の双方を適用できる。陽極としては、チタンやタン
タルの基体上に白金族金属や白金族金属酸化物で被覆し
たいわゆる金属陽極が使用できる。陽極の形状は、特に
制限されるものでなく、板、棒、エキスパンドメタル、
穿孔板、メッシュ等すべて使用可能である。また、陰極
としては、チタン、ステンレス、ニッケル、チタンの基
体上に白金族金属や白金族金属酸化物で被覆したものが
使用できる。陰極の形状は、陽極と同様に特に制限され
ず、板、棒、エキスパンドメタル、穿孔板、メッシュ等
すべて使用可能である。The type of electrolytic treatment apparatus used in the present invention is not particularly limited, and a tank type electrolytic cell or a filter press type electrolytic cell can be used. A box type or a cylindrical type is preferably used as the tank type. Further, as the electrode connection method in the electrolytic treatment apparatus of the present invention, both a bipolar type and a unipolar type can be applied. As the anode, a so-called metal anode obtained by coating a titanium or tantalum substrate with a platinum group metal or a platinum group metal oxide can be used. The shape of the anode is not particularly limited, and may be a plate, rod, expanded metal,
Perforated plate, mesh, etc. can all be used. As the cathode, a titanium, stainless steel, nickel, or titanium substrate coated with a platinum group metal or a platinum group metal oxide can be used. The shape of the cathode is not particularly limited as in the case of the anode, and any plate, rod, expanded metal, perforated plate, mesh or the like can be used.
【０００９】本発明において、電解処理の条件は、被処
理エタノールアミン含有希塩酸廃液のエタノールアミン
含量や処理量等により適宜選択することができる。好ま
しくは、電流密度は１〜５０Ａ／ｄｍ2 、温度２０〜７
０℃がよい。電流密度が１Ａ／ｄｍ2 より小さい場合
は、一定の廃液を処理するのに必要な電解槽が大規模に
なり設備費が嵩み好ましくなく、電流密度が５０Ａ／ｄ
ｍ2 より大きい場合には陽極の寿命が短くなったり、電
解での発熱が増え温度制御性が悪くなるので好ましくな
い。また、温度が２０℃より低い場合は、冷却に必要な
熱交換機が大規模になり設備費が嵩み好ましくなく、温
度が７０℃より高い場合は陽極の寿命が短くなったり、
電解槽構成材の腐食が増えるため好ましくない。また、
電解処理時間は、廃液組成、電解条件等により変わるの
で一概には定められないが、所望のエタノールアミンの
分解率が達成できる時間だけ電解すればよい。また、本
発明の被処理エタノールアミン含有希塩酸廃液の電解処
理は、連続法、バッチ法のいずれも採用できる。バッチ
法においては、所定量の被処理希塩酸廃液を所定の微酸
性とした後、電解工程に導入し所定時間電解処理して、
エタノールアミンを電解酸化除去して処理完了後に電解
工程から電解処理液を抜き出し排出する。一方、連続法
においては、電解工程に、所定流量の被処理エタノール
アミン含有希塩酸廃液を連続的に供給すると同時に、電
解処理液を電解工程から抜き出し、抜き出した電解処理
液の一部を排出し、残部を電解工程に循環して供給させ
ることができる。循環する電解処理液は、電解工程に供
給される被処理エタノールアミン含希塩酸廃液に混合し
て循環することができ、新たな被処理廃液の微酸性化と
同時に電解処理により低下したｐＨ値を所定のｐＨ値に
調整することができる。In the present invention, the conditions of the electrolytic treatment can be appropriately selected depending on the ethanolamine content and the treatment amount of the ethanolamine-containing dilute hydrochloric acid waste liquid to be treated. Preferably, the current density is 1 to 50 A / dm 2 , and the temperature is 20 to 7
0 ° C is good. If the current density is less than 1 A / dm 2, the electrolytic cell required to treat a certain amount of waste liquid will be large-scale and the equipment cost will be high, which is not preferable and the current density will be 50 A / d.
When it is larger than m 2, it is not preferable because the life of the anode is shortened and the heat generation in the electrolysis is increased to deteriorate the temperature controllability. Further, when the temperature is lower than 20 ° C, the heat exchanger required for cooling becomes large in scale and the equipment cost is not preferable, and when the temperature is higher than 70 ° C, the life of the anode is shortened,
It is not preferable because corrosion of the components of the electrolytic cell increases. Also,
The electrolytic treatment time is not generally determined because it varies depending on the waste liquid composition, electrolysis conditions, etc., but electrolysis may be performed only for a time at which a desired decomposition rate of ethanolamine can be achieved. Further, for the electrolytic treatment of the ethanolamine-containing dilute hydrochloric acid waste liquid to be treated according to the present invention, either a continuous method or a batch method can be adopted. In the batch method, after diluting a predetermined amount of dilute hydrochloric acid waste liquid to be treated to a predetermined slight acidity, it is introduced into an electrolysis step and electrolyzed for a predetermined time,
After completion of the treatment by electrolytically removing ethanolamine, the electrolytically treated liquid is extracted and discharged from the electrolytic process. On the other hand, in the continuous method, in the electrolysis step, at the same time continuously supplying a predetermined flow rate ethanolamine-containing dilute hydrochloric acid waste liquid to be treated, withdrawing the electrolysis solution from the electrolysis step, discharging a part of the extracted electrolysis solution, The balance can be circulated and supplied to the electrolysis step. The circulating electrolytic solution can be mixed with the ethanolamine-containing dilute hydrochloric acid waste liquid to be supplied to the electrolysis process and circulated, and the pH value lowered by the electrolytic treatment can be adjusted at the same time as the slight acidification of the new waste liquid to be treated. The pH value can be adjusted to
【００１０】上記した通り、本発明のエタノールアミン
含有希塩酸廃液の処理法は、被処理廃液を無隔膜で電解
処理するものであり、電解室内に隔膜を配備することな
く電解液のｐＨ値を微酸性に維持する。本発明の方法に
よると、希塩酸廃液中のエタノールアミンが直接陽極で
電解的に酸化される機構により分解でき、更に、電解室
内に次亜塩素酸及び次亜塩素酸ソーダの混合液が生成さ
せ、電解酸化と同時にエタノールアミンを酸化させるこ
とができる。即ち、本発明の処理法は、次亜塩素酸及び
次亜塩素酸ソーダによる化学的酸化と陽極による電解的
酸化の双方を利用してエタノールアミンを分解する極め
て効率のよい方法である。As described above, the method for treating a dilute hydrochloric acid waste solution containing ethanolamine of the present invention is an electrolytic treatment of a waste solution to be treated without a diaphragm, and the pH value of the electrolyte solution can be reduced without disposing a diaphragm in the electrolytic chamber. Keep acidic. According to the method of the present invention, ethanolamine in dilute hydrochloric acid waste liquid can be decomposed by a mechanism in which it is electrolytically oxidized directly at the anode, and further, a mixed solution of hypochlorous acid and sodium hypochlorite is produced in the electrolytic chamber, It is possible to oxidize ethanolamine simultaneously with electrolytic oxidation. That is, the treatment method of the present invention is an extremely efficient method of decomposing ethanolamine by utilizing both chemical oxidation by hypochlorous acid and sodium hypochlorite and electrolytic oxidation by the anode.
【００１１】[0011]
【実施例】本発明について実施例に基づき更に詳細に説
明する。但し、本発明は、下記の実施例に制限されるも
のではない。 実施例１〜２ 陽極及び陰極として共に電極寸法１０ｃｍ×１０ｃｍの
白金めっきしたチタンエキスパンドメタルを使用し、電
解室のセル枠には耐熱塩化ビニール樹脂を使用し、隔膜
を用いない電解槽を組み立てた。硝子製ビーカーに、塩
酸５重量％及びエタノールアミン１重量％を含有する水
溶液４００ミリリットルを疑似廃液として調製した。調
製した疑似廃液のｐＨ値は０以下で、ガラス電極式ｐＨ
メーターを用いて測定した。液中の全炭素濃度（ＴＯ
Ｃ）は４．０４ｇ／リットルであった。疑似廃液に２０
重量％苛性ソーダ水溶液を添加し中和し、ｐＨ値が表１
に示した値の微酸性状態にした。その後、微酸性化した
廃液を保持したビーカを恒温槽に入れ温度を６０±５℃
に加温維持した。恒温槽のビーカから、加温廃液を上記
で組立てた電解槽に４リットル／時間の流量で供給し且
つ抜き出して、恒温槽ビーカと電解槽と間を循環させる
と同時に、２０アンペアの電流で３時間電解した。電解
中、電解液の酸性度を上記ｐＨ値に維持するため苛性ソ
ーダの添加続けた。電解後の液をサンプリングし、液中
のＴＯＣを測定した。得られた測定結果を表１に示し
た。EXAMPLES The present invention will be described in more detail based on examples. However, the present invention is not limited to the following examples. Examples 1 and 2 Platinum-plated titanium expanded metal having an electrode size of 10 cm × 10 cm was used as both an anode and a cathode, a heat-resistant vinyl chloride resin was used for the cell frame of the electrolytic chamber, and an electrolytic cell without a diaphragm was assembled. . 400 ml of an aqueous solution containing 5% by weight of hydrochloric acid and 1% by weight of ethanolamine was prepared as a pseudo waste liquid in a glass beaker. The pH value of the prepared simulated waste liquid is 0 or less, and the glass electrode pH
It measured using the meter. Total carbon concentration in liquid (TO
C) was 4.04 g / liter. 20 for simulated waste
Neutralized by adding a wt% aqueous solution of caustic soda, and the pH value is shown in Table 1.
The value was set to the slightly acidic state shown in. After that, place the beaker holding the slightly acidified waste liquid in a constant temperature bath and raise the temperature to 60 ± 5 ° C.
It was kept warm. From the beaker in the constant temperature bath, the heated waste liquid is supplied to the electrolyzer as assembled above at a flow rate of 4 liters / hour and withdrawn so as to circulate between the beaker in the constant temperature bath and the electrolytic bath, and at the same time, with a current of 20 amps, 3 Electrolyzed for hours. During the electrolysis, caustic soda was continuously added to maintain the acidity of the electrolytic solution at the above pH value. The liquid after electrolysis was sampled and the TOC in the liquid was measured. Table 1 shows the obtained measurement results.
【００１２】[0012]
【表１】 [Table 1]
【００１３】比較例１ 電解液のｐＨ値を４〜４．５とした以外は実施例１と同
一条件及び装置で、同様に疑似廃液を電解処理した。そ
の結果、電解開始直後から塩素ガスが発生し、塩素ガス
の後処理が必要な明白であった。Comparative Example 1 The simulated waste liquid was electrolytically treated in the same manner as in Example 1 except that the pH value of the electrolytic solution was set to 4 to 4.5. As a result, it was obvious that chlorine gas was generated immediately after the start of electrolysis and that post-treatment with chlorine gas was necessary.
【００１４】比較例２ 電解液のｐＨ値を８．５〜９．０とした以外は実施例１
と同一条件及び装置で、同様に疑似廃液を電解処理し
た。電解槽より発生するガスを分析した結果、エタノー
ルアミンが４０００〜５０００容量ｐｐｍ含有されてい
ること明らかとなった。これは電解液のｐＨ値が高いた
め、エタノールアミンが非解離型となりガス側に揮発し
たものと推定される。Comparative Example 2 Example 1 except that the pH value of the electrolytic solution was 8.5 to 9.0.
Similarly, the simulated waste liquid was subjected to electrolytic treatment under the same conditions and apparatus. As a result of analyzing the gas generated from the electrolytic cell, it was revealed that ethanolamine was contained at 4000 to 5000 ppm by volume. This is presumably because ethanolamine became non-dissociative and volatilized to the gas side because the pH value of the electrolytic solution was high.
【００１５】[0015]
【発明の効果】本発明のエタノールアミン含有希塩酸廃
液の処理法は、隔膜を使用せずに所定に微酸性とした廃
液を電解処理するものであり、イオン交換膜等の高価な
部材を必要とすることがない。その上、微酸性化と同時
に塩化ナトリウムを生成共存させて無隔膜で電解処理す
ることから、電解液中に次亜塩素酸及び次亜塩素酸ソー
ダを生成させることができ、エタノールアミンは次亜塩
素酸イオンによる化学的酸化と、電解陽極による電気的
酸化の双方で分解されることになり効率的に廃液中から
除去することができる。また、従来の活性汚泥法に比
し、運転管理が容易であり、二次処理を要す副生物を生
成しないため処理コストが低減され、簡便に、安価に、
且つ、効率よくエタノールアミンを除去できる。しか
も、電解処理設備はコンパクトであり、処理設備が従来
の活性汚泥法に比し著しく小型化され設備経費の削減も
できるという利点もある。EFFECTS OF THE INVENTION The method for treating a dilute hydrochloric acid waste solution containing ethanolamine of the present invention electrolytically treats a waste solution that is made slightly acidic without using a diaphragm, and requires an expensive member such as an ion exchange membrane. There is nothing to do. Moreover, since sodium chloride is produced and coexisted at the same time as slight acidification and electrolysis is performed in a membrane-free membrane, hypochlorous acid and sodium hypochlorite can be produced in the electrolytic solution. It is decomposed by both the chemical oxidation by chlorate ion and the electric oxidation by the electrolytic anode, and can be efficiently removed from the waste liquid. Further, compared with the conventional activated sludge method, the operation management is easier, and by-products that require secondary treatment are not generated, the treatment cost is reduced, which is simple and inexpensive.
In addition, ethanolamine can be removed efficiently. In addition, the electrolytic treatment facility is compact, and the treatment facility is significantly smaller than the conventional activated sludge method, and the facility cost can be reduced.
Claims (3)
酸性で無隔膜電解処理してエタノールアミンを除去する
ことを特徴とするエタノールアミン含有希塩酸廃液の処
理法。1. A method for treating an ethanolamine-containing dilute hydrochloric acid waste liquid, which comprises subjecting the ethanolamine-containing dilute hydrochloric acid waste liquid to electrolytic treatment with a slightly acidic solution to remove ethanolamine.
１記載のエタノールアミン含有希塩酸廃液の処理法。2. The method for treating dilute hydrochloric acid waste solution containing ethanolamine according to claim 1, wherein the slightly acidic pH is 5 to 7.
ールアミン含有希塩酸廃液を循環供給して連続的に行な
われる請求項１または２記載のエタノールアミン含有希
塩酸廃液の処理法。3. The method for treating an ethanolamine-containing dilute hydrochloric acid waste liquid according to claim 1, wherein the electrolytic treatment is continuously performed by circulating the ethanolamine-containing dilute hydrochloric acid waste liquid into the diaphragmless electrolysis chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8080798A JPH09239371A (en) | 1996-03-07 | 1996-03-07 | Treatment of ethanolamine-containing waste dilute hydrochloric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8080798A JPH09239371A (en) | 1996-03-07 | 1996-03-07 | Treatment of ethanolamine-containing waste dilute hydrochloric acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09239371A true JPH09239371A (en) | 1997-09-16 |
Family
ID=13728488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8080798A Pending JPH09239371A (en) | 1996-03-07 | 1996-03-07 | Treatment of ethanolamine-containing waste dilute hydrochloric acid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09239371A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7081194B2 (en) | 2004-02-19 | 2006-07-25 | Mge Engineering Corporation | Method for treating ETA-containing wastewater |
| WO2011065222A1 (en) | 2009-11-25 | 2011-06-03 | 栗田工業株式会社 | Device and method for treating nitrogen compound-containing acidic solutions |
| JP2013141614A (en) * | 2012-01-06 | 2013-07-22 | Sumitomo Osaka Cement Co Ltd | Removal method for selenium in wastewater |
| JP2019120480A (en) * | 2018-01-05 | 2019-07-22 | 優章 荒井 | Ice making device |
-
1996
- 1996-03-07 JP JP8080798A patent/JPH09239371A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7081194B2 (en) | 2004-02-19 | 2006-07-25 | Mge Engineering Corporation | Method for treating ETA-containing wastewater |
| WO2011065222A1 (en) | 2009-11-25 | 2011-06-03 | 栗田工業株式会社 | Device and method for treating nitrogen compound-containing acidic solutions |
| JP2013141614A (en) * | 2012-01-06 | 2013-07-22 | Sumitomo Osaka Cement Co Ltd | Removal method for selenium in wastewater |
| JP2019120480A (en) * | 2018-01-05 | 2019-07-22 | 優章 荒井 | Ice making device |
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