JP2011050920A - Treatment method of aqueous coating material waste liquid - Google Patents
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Abstract
Description
本発明は、自動車塗装の材料として使用される水性塗料の廃液を処理する方法に関する。 The present invention relates to a method for treating a waste liquid of an aqueous paint used as a material for automobile painting.
自動車製造等の塗装工程においては、従来、有機溶剤を使用した塗料が用いられてきた。
しかしながら、環境保全の観点から、揮発性有機化合物（ＶＯＣ）の排出削減が求められるようになり、近年、有機溶剤を使用しない、あるいはまた、有機溶媒の使用量を大幅に減らして水で代替した、水性塗料を使用することが一般的になってきている。
Conventionally, paints using organic solvents have been used in painting processes such as automobile manufacturing.
However, volatile organic compound (VOC) emissions have been reduced from the viewpoint of environmental conservation. In recent years, organic solvents have not been used, or the amount of organic solvents used has been greatly reduced and replaced with water. It is becoming common to use water-based paints.
水性塗料を使用した自動車ボディーの塗装においては、品質の一定化のために、ロボットによる自動塗装が行われている。このロボット塗装における塗料の色替えの際には、ロボット配管内等の系内から残存塗料を洗浄除去した後、新たな色の塗料を導入しなければならない。
従来は、前記洗浄除去は、系内に純水を送入し、残存塗料を溶解して排出することにより行われており、排出された廃液は、塗装ブース内から回収後、そのまま焼却処分されていた。
In the painting of automobile bodies using water-based paints, automatic painting by a robot is performed in order to make the quality constant. When changing the color of the paint in the robot painting, it is necessary to clean the remaining paint from the system such as the robot piping and then introduce a new color paint.
Conventionally, the cleaning and removal is performed by sending pure water into the system and dissolving and discharging the remaining paint, and the discharged waste liquid is collected from the painting booth and then incinerated. It was.
なお、上記のような焼却処分以外の有機性廃水の処理方法としては、例えば、廃水中に含まれる油脂等のヘキサン抽出物質を酵母に吸着させて処理する方法（特許文献１参照）や、微生物を用いて分解処理する方法（特許文献２参照）等も知られている。
また、特許文献３には、アルカリを混合することにより水性塗料の廃液を処理する方法が開示されている。
In addition, as a processing method of organic waste water other than the incineration disposal as described above, for example, a method of adsorbing hexane extract substances such as fats and oils contained in the waste water to yeast (see Patent Document 1), a microorganism There is also known a method of performing a decomposition process using a method (see Patent Document 2).
Patent Document 3 discloses a method for treating a waste liquid of a water-based paint by mixing an alkali.
従来のように、水性塗料を含む廃液を焼却処分する場合、該廃液中には不燃性の水が多量に含まれているため、大量の燃焼材中に廃液を少量ずつ混合させ、高温で燃焼させなければならず、焼却効率に劣り、また、ＣＯ2排出量等の点で環境に対する負荷も大きいものであった。しかも、処理コストは、有機溶剤系の塗料に比べて高額であるという課題も有していた。 When the waste liquid containing water-based paint is incinerated as in the past, the waste liquid contains a large amount of nonflammable water, so the waste liquid is mixed little by little in a large amount of combustion material and burned at a high temperature. The incineration efficiency is inferior, and the burden on the environment is large in terms of CO 2 emissions. In addition, the treatment cost has a problem that it is expensive compared to organic solvent-based paints.
そこで、本発明者は、前記水性塗料廃液を低コストかつ効率的に処理すべく、水性塗料廃液から廃水のみを分離浄化し、一般の工場廃水として廃棄するための処理方法について検討を重ねた結果、上記特許文献１〜３に記載されている処理方法とは異なる抽出方法による処理方法を見出した。 Therefore, the present inventor conducted a study on a treatment method for separating and purifying only waste water from the aqueous paint waste liquid and disposing it as general factory waste water in order to treat the aqueous paint waste liquid at low cost and efficiently. The processing method by the extraction method different from the processing method described in the said patent documents 1-3 was discovered.
すなわち、本発明は、上記技術的課題を解決するためになされたものであり、水性塗料を含む廃液を、大型設備を導入することなく、簡便に、短時間かつ低コストで処理することができ、環境への負荷も低減することができる水性塗料廃液の処理方法を提供することを目的とするものである。 That is, the present invention has been made in order to solve the above technical problem, and waste liquid containing a water-based paint can be treated easily, in a short time and at low cost without introducing a large facility. An object of the present invention is to provide a method for treating a water-based paint waste liquid that can also reduce the environmental load.
本発明に係る水性塗料廃液の処理方法は、水性塗料を含む廃液に、有機溶媒及び酸を添加して酸性にした後、分液する工程と、前記工程で得られた水層に、前記有機溶媒及び活性炭を添加した後、ろ過及び分液する工程と、前記工程により得られた水層に、アルカリを添加して中和する工程とを備え、前記有機溶媒として、炭化水素系、エーテル系及びエステル系のうちの少なくともいずれか１種の溶媒と、ケトン系及びハロゲン系のうちの少なくともいずれか１種の溶媒との混合溶媒を用いることを特徴とする。
このような方法によれば、効率的に抽出処理を行うことができ、連続操作が可能であり、しかも、抽出溶媒のコスト削減を図ることができ、短時間かつ低コストで廃液を処理することができる。
The method for treating a water-based paint waste liquid according to the present invention includes a step of separating the liquid after adding an organic solvent and an acid to a waste liquid containing the water-based paint, and separating the organic layer into the water layer obtained in the step. After adding a solvent and activated carbon, it is provided with a step of filtration and liquid separation, and a step of adding an alkali to the aqueous layer obtained by the step to neutralize, and as the organic solvent, a hydrocarbon type, an ether type And a mixed solvent of at least any one of ester solvents and at least any one of ketone and halogen solvents.
According to such a method, the extraction process can be performed efficiently, continuous operation is possible, the cost of the extraction solvent can be reduced, and the waste liquid can be processed in a short time and at a low cost. Can do.
上記処理方法においては、抽出効率や操作性の観点から、前記有機溶媒として、エステル系／ケトン系の混合溶媒を用いることが好ましい。また、前記エステル系／ケトン系の混合溶媒は、エステル系／ケトン系の混合比が１以上であることが好ましい。 In the processing method, from the viewpoint of extraction efficiency and operability, it is preferable to use an ester / ketone mixed solvent as the organic solvent. The ester / ketone mixed solvent preferably has an ester / ketone mixing ratio of 1 or more.
前記エステル系／ケトン系の混合溶媒は、特に、酢酸イソブチル／メチルイソブチルケトン（以下、ＭＩＢＫという）の混合溶媒であることが好ましい。
このような混合溶媒を用いることにより、後工程でのろ過性を向上させることができ、処理工程において新たに水を添加することなく、廃液の浄化処理を行うことができる。
The ester / ketone mixed solvent is particularly preferably a mixed solvent of isobutyl acetate / methyl isobutyl ketone (hereinafter referred to as MIBK).
By using such a mixed solvent, the filterability in the subsequent process can be improved, and the waste liquid can be purified without newly adding water in the treatment process.
本発明に係る水性塗料廃液の処理方法によれば、抽出工程の改善により、大型設備を導入することなく、簡便に、処理時間の短縮を図ることができ、かつ、低コストで、廃水を浄化することができる。
また、本発明によれば、廃液を焼却処分する際のコスト削減及びＣＯ2排出量の抑制も図ることができ、環境に対する負荷を軽減することもできる。
According to the method for treating a water-based paint waste liquid according to the present invention, by improving the extraction process, it is possible to easily reduce the treatment time without introducing large equipment, and purify waste water at a low cost. can do.
Further, according to the present invention, it is possible to reduce the cost and reduce the CO 2 emission amount when incinerating the waste liquid, and to reduce the burden on the environment.
以下、本発明を、より詳細に説明する。
本発明に係る水性塗料の廃液処理方法の処理工程の概要を図１に示す。
図１に示すように、本発明に係る処理方法は、水性塗料を含む廃液に、有機溶媒及び酸を添加して酸性にした後、分液する工程（第１工程）と、前記工程で得られた水層に、前記有機溶媒及び活性炭を添加した後、ろ過及び分液する工程（第２工程）と、前記工程により得られた水層に、アルカリを添加して中和する工程（第３工程）とを経るものである。
そして、前記第１及び第２工程において用いられる有機溶媒が、炭化水素系、エーテル系及びエステル系のうちの少なくともいずれか１種の溶媒と、ケトン系及びハロゲン系のうちの少なくともいずれか１種の溶媒との混合溶媒であることを特徴とする。
Hereinafter, the present invention will be described in more detail.
FIG. 1 shows an outline of the processing steps of the water-based paint waste liquid processing method according to the present invention.
As shown in FIG. 1, the treatment method according to the present invention is obtained in the step (first step) of separating a liquid after adding an organic solvent and an acid to a waste liquid containing an aqueous paint, and then separating the solution. After adding the organic solvent and activated carbon to the obtained aqueous layer, a step of filtration and separation (second step), and a step of neutralizing the aqueous layer obtained by the step by adding an alkali (first step) 3 steps).
The organic solvent used in the first and second steps is at least any one of hydrocarbon, ether and ester, and at least one of ketone and halogen. It is a mixed solvent with the above solvent.
上記のように、本発明に係る処理方法は、廃液を含む系を酸性にした後、所定の有機溶媒での抽出工程を経て、最後に中和して、廃水を浄化することを特徴とするものである。 As described above, the treatment method according to the present invention is characterized in that after the system containing waste liquid is acidified, it is subjected to an extraction step with a predetermined organic solvent and finally neutralized to purify the waste water. Is.
以下、本発明に係る処理方法を、各工程順に詳細に説明する。
まず、第１工程においては、廃液に、有機溶媒及び酸を添加して酸性にする。
ここでいう廃液は、水性塗料が含まれているものでよく、前記水性塗料は、特に、自動車塗装用の水性塗料に限定されるものではない。
前記有機溶媒の添加量は、廃液５００ｇに対して１０〜５０００ｇであることが好ましく、５０〜１０００ｇであることがより好ましい。
前記添加量が１０ｇより少ない場合、有機溶媒が廃液に溶解するおそれがある。一方、前記添加量が５０００ｇを超えると、廃液中の水が有機溶媒中に多く溶解し、有機廃液（有機層）の処理が困難になり、廃液処理のコストアップにつながるおそれがある。
Hereinafter, the processing method according to the present invention will be described in detail in the order of each step.
First, in the first step, an organic solvent and an acid are added to the waste liquid to make it acidic.
The waste liquid here may contain water-based paint, and the water-based paint is not particularly limited to water-based paint for automobile painting.
The amount of the organic solvent added is preferably 10 to 5000 g and more preferably 50 to 1000 g with respect to 500 g of the waste liquid.
When the addition amount is less than 10 g, the organic solvent may be dissolved in the waste liquid. On the other hand, when the addition amount exceeds 5000 g, a large amount of water in the waste liquid dissolves in the organic solvent, and it becomes difficult to treat the organic waste liquid (organic layer), which may lead to an increase in the cost of the waste liquid treatment.
前記有機溶媒は、混合溶媒として用いることが好ましく、トルエン、キシレン等の炭化水素系、テトラヒドロフラン（ＴＨＦ）、メチルターシャリーブチルエーテル（ＭＴＢＥ）等のエーテル系、酢酸エチル、酢酸イソプロピル等のエステル系の溶媒から選ばれた少なくとも１種と、ＭＩＢＫ、メチルエチルケトン（ＭＥＫ）等のケトン系、クロロホルム、ジクロロメタン等のハロゲン系、メタノール、エタノール等のアルコール系の溶媒から選ばれた少なくとも１種との混合溶媒を用いる。
ケトン系やハロゲン系、アルコール系の溶媒は、水との親和性が高く、水層と有機層とに２層分離せず、抽出操作が困難となるため、これらの溶媒と、上記のような炭化水素系やエーテル系、エステル系の溶媒との混合系として用いることが好ましい。
なお、例えば、炭化水素系のトルエンや、エステル系の酢酸イソブチルを単独で、前記有機溶媒として添加する場合は、抽出操作時に２層分離させるためには、酸だけでなく、廃液の１／５程度の量の水を添加する必要があり、浄化廃水の収率の低下や廃液処理のコストアップとなるため好ましくない。
The organic solvent is preferably used as a mixed solvent, hydrocarbon solvents such as toluene and xylene, ether solvents such as tetrahydrofuran (THF) and methyl tertiary butyl ether (MTBE), and ester solvents such as ethyl acetate and isopropyl acetate. And a mixed solvent of at least one selected from the group consisting of ketones such as MIBK and methyl ethyl ketone (MEK), halogens such as chloroform and dichloromethane, and alcohols such as methanol and ethanol. .
Ketone-based, halogen-based, and alcohol-based solvents have a high affinity with water, and the two layers are not separated into an aqueous layer and an organic layer, making the extraction operation difficult. It is preferably used as a mixed system with a hydrocarbon-based, ether-based or ester-based solvent.
For example, when hydrocarbon-based toluene or ester-based isobutyl acetate is added alone as the organic solvent, in order to separate the two layers during the extraction operation, not only the acid but also 1/5 of the waste liquid is used. Since it is necessary to add a certain amount of water, it is not preferable because it reduces the yield of purified wastewater and increases the cost of waste liquid treatment.
上記の混合系の中でも、エステル系／ケトン系の混合溶媒がより好ましく、また、特に、エステル系溶媒の中でも、コスト、環境の観点から、水性塗料に混合して用いられている酢酸イソブチル／ケトン系の混合溶媒が好ましい。
また、エステル系／ケトン系の混合溶媒を用いる場合は、上述したような溶媒特性に鑑みて、エステル系／ケトン系の混合比は、１以上であることが好ましい。
Among the above mixed systems, an ester / ketone mixed solvent is more preferable, and among the ester solvents, isobutyl acetate / ketone used by mixing with an aqueous paint from the viewpoint of cost and environment. A mixed solvent of the system is preferred.
In the case of using an ester / ketone mixed solvent, the ester / ketone mixing ratio is preferably 1 or more in view of the solvent characteristics as described above.
また、添加する酸は、一般的な無機酸を用いることができ、特に限定されるものではなく、例えば、塩酸、硝酸、硫酸等が挙げられる。酸の濃度は、安全性やｐＨ調整の容易性等の観点から、希酸を用いることが好ましい。
前記酸は、廃液を酸性にするために添加されるものであり、廃液に有機溶媒を添加して、よく撹拌しながら、滴下していき、ｐＨ１〜６程度に調整することが好ましい。このように、廃液を酸性にすることにより、２層分離させることができる。
なお、酸の添加により、廃液の発熱が大きくなるおそれがある場合は、前記有機溶媒を添加した廃液を、０〜１０℃程度に、予め冷却しておくことが好ましい。
Moreover, the acid to add can use a general inorganic acid, and is not specifically limited, For example, hydrochloric acid, nitric acid, a sulfuric acid etc. are mentioned. The acid concentration is preferably a dilute acid from the viewpoints of safety and ease of pH adjustment.
The acid is added to make the waste liquid acidic, and it is preferable to add an organic solvent to the waste liquid and add it dropwise while stirring well to adjust the pH to about 1-6. Thus, by making the waste liquid acidic, two layers can be separated.
In addition, when there exists a possibility that heat_generation | fever of a waste liquid may become large by addition of an acid, it is preferable to cool beforehand the waste liquid to which the said organic solvent was added to about 0-10 degreeC.
前記酸を滴下後、廃液中の樹脂塗料成分を十分に溶解し、２層分離を促進するため、廃液を加熱することが好ましい。
加熱温度は、３０〜１００℃が好ましく、４０〜８０℃であることがより好ましい。
前記加熱温度が低すぎる場合、２層分離しないおそれがあり、一方、高すぎると、有機溶媒が揮発しやすくなり好ましくない。
After dripping the acid, it is preferable to heat the waste liquid in order to sufficiently dissolve the resin coating component in the waste liquid and promote two-layer separation.
30-100 degreeC is preferable and, as for heating temperature, it is more preferable that it is 40-80 degreeC.
If the heating temperature is too low, the two layers may not be separated. On the other hand, if the heating temperature is too high, the organic solvent tends to volatilize, which is not preferable.
上記のように加熱する場合、加熱時間は、２０〜１２０分間が好ましく、３０〜６０分間とすることがより好ましい。
加熱時間が短すぎる場合、２層分離しないおそれがあり、一方、長すぎると、有機溶媒の揮発量が多くなり、作業性、安全性、環境負荷の点で好ましくない。
When heating as described above, the heating time is preferably 20 to 120 minutes, and more preferably 30 to 60 minutes.
If the heating time is too short, the two layers may not be separated. On the other hand, if the heating time is too long, the volatilization amount of the organic solvent increases, which is not preferable in terms of workability, safety, and environmental load.
上記のようにして、酸性化された廃液は、静置して２層分離させた後、分液し、回収した水層を、次の第２工程に供する。
なお、分液された有機層は、次の第２の工程で回収される有機層と併せて廃棄されるが、焼却の燃料として用いることができる。
As described above, the acidified waste liquid is allowed to stand to be separated into two layers, and then separated, and the recovered aqueous layer is subjected to the next second step.
The separated organic layer is discarded together with the organic layer recovered in the next second step, but can be used as a fuel for incineration.
次に、第２工程では、前記第１工程で回収された水層に、有機溶媒及び活性炭を添加して、活性炭による吸着ろ過処理を行う。
前記有機溶媒及び活性炭を添加した水層は、よく撹拌し、前記水層中に残存している有機固形物の微粒子を活性炭に十分に吸着させる。
Next, in a 2nd process, an organic solvent and activated carbon are added to the water layer collect | recovered at the said 1st process, and the adsorption filtration process by activated carbon is performed.
The aqueous layer to which the organic solvent and activated carbon have been added is stirred well so that the organic solid fine particles remaining in the aqueous layer are sufficiently adsorbed onto the activated carbon.
ここで添加される有機溶媒は、前記第１工程で添加された有機溶媒と同様のものが用いられ、また、添加量も同等でよい。
このような有機溶媒を用いることにより、後のろ過工程におけるろ過時間が短縮され、ろ過性の向上を図ることができる。
The organic solvent added here is the same as the organic solvent added in the first step, and the addition amount may be equal.
By using such an organic solvent, the filtration time in the subsequent filtration step can be shortened and the filterability can be improved.
前記活性炭は、その種類や形状等は特に限定されるものではないが、例えば、粒径０．１〜１００ｍｍ程度の破砕状、粒状、粉末状等の植物質、石炭質又は石油質等の原材料からなるものを用いることができる。
前記活性炭の添加量は、添加される水層の量に対して０．０５〜５０％であることが好ましく、０．５〜２５％であることがより好ましい。
前記添加量が０．０５％未満の場合、前記水層中に残存している有機固形物の微粒子が十分に吸着されないおそれがある。一方、前記添加量が５０％を超える場合、それ以上の添加量に見合った吸着効果は得られず、コスト高になる。
The activated carbon is not particularly limited in its type, shape, etc., but for example, raw materials such as crushed, granular, powdery, etc. plant, coal or petroleum with a particle size of about 0.1 to 100 mm Can be used.
The amount of the activated carbon added is preferably 0.05 to 50% and more preferably 0.5 to 25% with respect to the amount of the aqueous layer to be added.
When the addition amount is less than 0.05%, the organic solid fine particles remaining in the aqueous layer may not be sufficiently adsorbed. On the other hand, when the addition amount exceeds 50%, an adsorption effect commensurate with the addition amount beyond that cannot be obtained, resulting in an increase in cost.
上記のようにして吸着処理を行った後の活性炭は、分別除去する。この分別除去は、ろ過により行うことができ、例えば、金網等の粗めのろ材を用いて２回程度ろ過した後、ろ紙を用いて１回ろ過する等の工程を経て行うことができる。 The activated carbon after the adsorption treatment as described above is separated and removed. This separation and removal can be performed by filtration, and can be performed, for example, through a process of filtering about twice using a coarse filter medium such as a wire mesh and then filtering once using a filter paper.
ろ過後、回収したろ液を静置し、２層分離させた後、分液し、回収した水層を、次の第３工程に供する。
なお、分液された有機層は、先の第１工程で回収された有機層と併せて廃棄されるが、焼却の燃料として用いることができる。
After filtration, the recovered filtrate is allowed to stand, and after two layers are separated, liquid separation is performed, and the recovered aqueous layer is subjected to the next third step.
The separated organic layer is discarded together with the organic layer recovered in the first step, but can be used as a fuel for incineration.
次の第３工程では、前記第２の工程で回収された水層に、アルカリを添加して中和する。
ここで添加するアルカリは、一般的な無機アルカリを用いることができ、特に限定されるものではなく、例えば、苛性ソーダ、苛性カリ等が挙げられる。これらは、安全性やｐＨ調整の容易性等の観点から、水溶液を用いることが好ましい。
上記のようにして、有機物が除去処理された廃水は、一次工場廃水として廃棄することができる。
In the next third step, the aqueous layer recovered in the second step is neutralized by adding an alkali.
The alkali added here may be a general inorganic alkali, and is not particularly limited, and examples thereof include caustic soda and caustic potash. From these viewpoints, it is preferable to use an aqueous solution from the viewpoint of safety and ease of pH adjustment.
As described above, the wastewater from which organic substances have been removed can be discarded as primary factory wastewater.
以下、本発明を実施例に基づきさらに具体的に説明するが、本発明は下記実施例により制限されるものではない。
［実施例１］
水性塗料を含む廃液５００ｇに、酢酸イソブチル／ＭＩＢＫ混合溶媒（混合比７／３）５００ｇを混合し、撹拌しながら０℃に冷却した。これに、２．０ｍｏｌ／Ｌ硝酸５．５ｇを滴下し、ｐＨ１とした後、５０℃まで昇温した。３０分間撹拌した後、放冷して２層分離させ、水層５９４．９ｇを得た。
この水層に、前記混合溶媒５００ｇと活性炭２５ｇを混合した。２時間撹拌後、２００メッシュの金網で３．５時間かけて２回濾し、さらに、ろ紙で２．５時間かけてろ過した。静置後、水層を分液し、５０％苛性ソーダ水０．０９ｇにて中和し、水層（精製された廃水）２３６．９ｇ（収率４７．４％）を得た。
EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example, this invention is not restrict | limited by the following Example.
[Example 1]
500 g of a waste liquid containing a water-based paint was mixed with 500 g of an isobutyl acetate / MIBK mixed solvent (mixing ratio 7/3), and cooled to 0 ° C. with stirring. To this, 5.5 g of 2.0 mol / L nitric acid was added dropwise to adjust the pH to 1, and then the temperature was raised to 50 ° C. After stirring for 30 minutes, the mixture was allowed to cool and the two layers were separated to obtain 594.9 g of an aqueous layer.
In this aqueous layer, 500 g of the mixed solvent and 25 g of activated carbon were mixed. After stirring for 2 hours, the mixture was filtered twice with a 200-mesh wire mesh for 3.5 hours, and further filtered with filter paper for 2.5 hours. After standing, the aqueous layer was separated and neutralized with 0.09 g of 50% caustic soda water to obtain 236.9 g (yield 47.4%) of the aqueous layer (purified waste water).
［実施例２］
水性塗料を含む廃液５００ｇに、酢酸イソブチル／ＭＩＢＫ混合溶媒（混合比９／１）５００ｇを混合し、撹拌しながら０℃に冷却した。これに、２．０ｍｏｌ／Ｌ硝酸４．１ｇを滴下し、ｐＨ１とした後、５０℃まで昇温した。３０分間撹拌した後、放冷して２層分離させ、水層（精製された廃水）６１６．２ｇを得た。
この水層に、前記混合溶媒５００ｇと活性炭２５ｇを混合した。２時間撹拌後、２００メッシュの金網で５．５時間かけて２回濾し、さらに、ろ紙で１０時間かけてろ過した。静置後、水層を分液し、５０％苛性ソーダ水０．０９ｇにて中和し、水層（精製された廃水）２７７．５ｇ（収率５５．５％）を得た。
[Example 2]
500 g of a waste liquid containing a water-based paint was mixed with 500 g of a mixed solvent of isobutyl acetate / MIBK (mixing ratio 9/1) and cooled to 0 ° C. with stirring. To this, 4.1 g of 2.0 mol / L nitric acid was added dropwise to adjust the pH to 1, and then the temperature was raised to 50 ° C. After stirring for 30 minutes, the mixture was allowed to cool and separated into two layers to obtain 616.2 g of an aqueous layer (purified waste water).
In this aqueous layer, 500 g of the mixed solvent and 25 g of activated carbon were mixed. After stirring for 2 hours, the mixture was filtered twice with a 200-mesh wire mesh for 5.5 hours, and further filtered with filter paper for 10 hours. After standing, the aqueous layer was separated and neutralized with 0.09 g of 50% caustic soda water to obtain 277.5 g (yield 55.5%) of the aqueous layer (purified waste water).
［比較例１］
水性塗料を含む廃液５００ｇに、トルエン６００ｇと水１００ｇを混合し、撹拌しながら０℃に冷却した。これに、２．０ｍｏｌ／Ｌ硝酸５．５ｇを滴下し、ｐＨ１とした後、５０℃まで昇温した。３０分間撹拌した後、放冷して２層分離させ、水層８０１．０ｇを得た。
この水層に、トルエン５００ｇと活性炭２５ｇを混合した。２時間撹拌後、２００メッシュの金網で１０時間かけて２回濾し、さらに、ろ紙で２４時間かけてろ過した。静置後、水層を分液し、５０％苛性ソーダ水０．４２ｇにて中和し、水層（精製された廃水）２６４．８ｇ（収率４４．７％）を得た。
[Comparative Example 1]
600 g of toluene and 100 g of water were mixed with 500 g of the waste liquid containing the aqueous paint, and cooled to 0 ° C. with stirring. To this, 5.5 g of 2.0 mol / L nitric acid was added dropwise to adjust the pH to 1, and then the temperature was raised to 50 ° C. After stirring for 30 minutes, the mixture was allowed to cool and separated into two layers to obtain 801.0 g of an aqueous layer.
To this aqueous layer, 500 g of toluene and 25 g of activated carbon were mixed. After stirring for 2 hours, the mixture was filtered twice with a 200-mesh wire mesh for 10 hours, and further filtered with filter paper for 24 hours. After standing, the aqueous layer was separated and neutralized with 0.42 g of 50% caustic soda water to obtain 264.8 g (yield 44.7%) of the aqueous layer (purified waste water).
［比較例２］
水性塗料を含む廃液５００ｇに、酢酸イソブチル６００ｇと水１００ｇを混合し、撹拌しながら０℃に冷却した。これに、２．０ｍｏｌ／Ｌ硝酸６．１ｇを滴下し、ｐＨ１とした後、５０℃まで昇温した。３０分間撹拌した後、放冷して２層分離させ、水層８５６．４ｇを得た。
この水層に、トルエン５００ｇと活性炭２５ｇを混合した。２時間撹拌後、２００メッシュの金網で１５時間かけて２回濾し、さらに、ろ紙で１０時間かけてろ過した。静置後、水層を分液し、５０％苛性ソーダ水０．３５ｇにて中和し、水層（精製された廃水）１４４．７ｇ（収率２８．９％）を得た。
[Comparative Example 2]
To 500 g of a waste liquid containing a water-based paint, 600 g of isobutyl acetate and 100 g of water were mixed and cooled to 0 ° C. with stirring. To this, 6.1 g of 2.0 mol / L nitric acid was added dropwise to adjust the pH to 1, and then the temperature was raised to 50 ° C. After stirring for 30 minutes, the mixture was allowed to cool and the two layers were separated to obtain 856.4 g of an aqueous layer.
To this aqueous layer, 500 g of toluene and 25 g of activated carbon were mixed. After stirring for 2 hours, the mixture was filtered twice with a 200 mesh wire mesh for 15 hours, and further filtered with filter paper for 10 hours. After standing, the aqueous layer was separated and neutralized with 0.35 g of 50% caustic soda water to obtain 144.7 g (yield 28.9%) of the aqueous layer (purified waste water).
［比較例３］
水性塗料を含む廃液５００ｇに、ＭＩＢＫ６００ｇと水１００ｇを混合し、撹拌しながら０℃に冷却した。これに、２．０ｍｏｌ／Ｌ硝酸６．２ｇを滴下し、ｐＨ１とした後、５０℃まで昇温した。３０分間撹拌した後、放冷したが、２層分離しなかった。
さらに、ＭＩＢＫ２００ｇと活性炭２５ｇを混合し、２時間撹拌した。静置後も、２層分離しなかった。
[Comparative Example 3]
MIBK 600 g and water 100 g were mixed with 500 g of a waste liquid containing an aqueous paint, and cooled to 0 ° C. with stirring. To this, 6.2 g of 2.0 mol / L nitric acid was added dropwise to adjust the pH to 1, and then the temperature was raised to 50 ° C. After stirring for 30 minutes, the mixture was allowed to cool, but the two layers were not separated.
Further, 200 g of MIBK and 25 g of activated carbon were mixed and stirred for 2 hours. Even after standing, the two layers were not separated.
上記実施例及び比較例の結果から、廃液に、酢酸イソブチル／ＭＩＢＫ混合溶媒を混合した場合（実施例１及び２）は、短いろ過時間で、高い収率で、浄化された廃水を得ることができることが認められた。 From the results of the above Examples and Comparative Examples, when an isobutyl acetate / MIBK mixed solvent was mixed with the waste liquid (Examples 1 and 2), it was possible to obtain purified waste water with high yield in a short filtration time. It was recognized that we could do it.
Claims (4)
前記有機溶媒として、炭化水素系、エーテル系及びエステル系のうちの少なくともいずれか１種の溶媒と、ケトン系及びハロゲン系のうちの少なくともいずれか１種の溶媒との混合溶媒を用いることを特徴とする水性塗料廃液の処理方法。 An organic solvent and an acid are added to a waste liquid containing an aqueous paint to make it acidic, followed by liquid separation, and after adding the organic solvent and activated carbon to the aqueous layer obtained in the process, filtration and liquid separation And a step of neutralizing the aqueous layer obtained by the step by adding an alkali,
As the organic solvent, a mixed solvent of at least one of hydrocarbon-based, ether-based and ester-based solvents and at least any one of ketone-based and halogen-based solvents is used. A method for treating a water-based paint waste liquid.
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