JPH11277088A - Treatment of waste water containing water-soluble hydraulic fluid - Google Patents
Treatment of waste water containing water-soluble hydraulic fluidInfo
- Publication number
- JPH11277088A JPH11277088A JP10103497A JP10349798A JPH11277088A JP H11277088 A JPH11277088 A JP H11277088A JP 10103497 A JP10103497 A JP 10103497A JP 10349798 A JP10349798 A JP 10349798A JP H11277088 A JPH11277088 A JP H11277088A
- Authority
- JP
- Japan
- Prior art keywords
- treatment
- water
- activated sludge
- treated
- bod
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Activated Sludge Processes (AREA)
- Water Treatment By Sorption (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、洗浄や冷却などの
一般産業排水を法令で定められる基準以下の処理水とす
るための排水処理方法に関し、特には、水溶性作動油剤
を含む排水のＣＯＤ（化学的酸素要求量）及びＢＯＤ
（生物化学的酸素要求量）を効率よく低下させるために
改良された排水処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater treatment method for converting general industrial wastewater, such as washing and cooling water, into treated water below a standard stipulated by law, and more particularly to COD of wastewater containing a water-soluble hydraulic fluid. (Chemical oxygen demand) and BOD
The present invention relates to an improved wastewater treatment method for efficiently reducing (biochemical oxygen demand).
【０００２】[0002]
【従来の技術】油圧モーター、油圧シリンダー等のいわ
ゆる油圧機器は汎用的に使用されていて、これらの油圧
機器から漏れだした作動油が排水中に混入することがあ
る。作動油は一般的に鉱物油を主成分としていて、鉱物
油は排水１リットル当たり数ミリグラム以下に処理しな
くてはその排水を放流することができない。2. Description of the Related Art Hydraulic motors, hydraulic cylinders, and other so-called hydraulic devices are commonly used, and hydraulic oil leaked from these hydraulic devices may be mixed into drainage water. Hydraulic oils generally contain mineral oil as a main component, and the mineral oil cannot be discharged unless it is processed to a level of several milligrams or less per liter of wastewater.
【０００３】排水中の作動油の除去は、油分が水分から
分離して浮き上がる性質を利用すれば容易である。界面
活性剤の混入により油分が乳化、分散して前記のように
水分から分離しないとしても、このような分散した油分
は膜ろ過法によって容易に排水から除去させることがで
きる。[0003] The removal of hydraulic oil in wastewater is easy if the oil component is separated from water and floats. Even if the oil is emulsified and dispersed by the incorporation of the surfactant and does not separate from the water as described above, such dispersed oil can be easily removed from the wastewater by a membrane filtration method.
【０００４】また、鉱物油を主成分とした作動油は火災
の原因となることがあって、火災の危険を回避するため
には水溶性の作動油を採用したい。市販されている代表
的な水溶性作動油としては、例えば、ユシロ化学工業製
の商品名ユシロンルビックＨＦＣ４３がある。[0004] Hydraulic oil containing mineral oil as a main component may cause fire, and it is desirable to employ water-soluble hydraulic oil in order to avoid the danger of fire. As a typical commercially available water-soluble hydraulic oil, there is, for example, Yusilon Rubic HFC43 (trade name, manufactured by Yushiro Chemical Industry Co., Ltd.).
【０００５】このような水溶性の作動油はグリコール水
溶液を主成分とし、排水に混入すればその混入量によっ
てはＢＯＤ、ＣＯＤが排水１リットル当たり数百ミリグ
ラムとなることがある。ＢＯＤ、ＣＯＤは排水１リット
ル当たり数十ミリグラム以下に処理しなくてはその排水
を放流することができない。[0005] Such a water-soluble hydraulic oil contains a glycol aqueous solution as a main component, and if mixed in the wastewater, the BOD and COD may be several hundred milligrams per liter of the wastewater depending on the amount of the mixed oil. BOD and COD cannot be discharged unless the wastewater is treated to several tens of milligrams per liter of wastewater.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、グリコ
ールは凝集沈殿させ難く、また、ろ過膜を通過し易い特
徴を持つから、後に詳しく説明するように、グリコール
に汚染された排水のＢＯＤ、ＣＯＤを低下させることは
従来の排水処理技術によっては困難であって改善が求め
られてきた。However, glycol has a characteristic that it is difficult to coagulate and precipitate and easily passes through a filtration membrane. Therefore, as will be described in detail later, the BOD and COD of wastewater contaminated with glycol are reduced. This is difficult with conventional wastewater treatment techniques, and improvements have been required.
【０００７】本発明は、水溶性作動油が混入した排水で
あってもそのＢＯＤ、ＣＯＤを放流可能なレベルまで効
果的に低下させることができる排水処理方法を提供する
ことを目的としている。[0007] It is an object of the present invention to provide a wastewater treatment method capable of effectively reducing the BOD and COD of a wastewater mixed with a water-soluble hydraulic oil to a level at which the wastewater can be discharged.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に、本発明の排水処理方法においては、活性汚泥処理と
活性炭吸着処理を組み合わせて採用することとし、特に
活性汚泥処理後の排水を活性炭吸着処理することとし
た。好適には、活性汚泥処理には膜分離活性汚泥処理を
採用する。更に好適には、活性汚泥処理は処理後のＢＯ
Ｄの値が排水１０００ｃｃ当たり３０ｍｇ以下となる滞
留時間とする。To achieve the above object, the wastewater treatment method of the present invention employs a combination of activated sludge treatment and activated carbon adsorption treatment. Adsorption treatment was performed. Preferably, the activated sludge treatment employs a membrane separation activated sludge treatment. More preferably, the activated sludge treatment is carried out after the treatment with BO.
The residence time at which the value of D becomes 30 mg or less per 1,000 cc of drainage water.
【０００９】このような方法により水溶性作動油が混入
した廃水を処理すれば、まず活性汚泥処理により排水の
ＢＯＤを効率よく低下させることができる。次に活性炭
吸着処理を行えば、活性汚泥処理後に処理水に残留した
ＣＯＤ原因物質は活性炭に吸着され易い特徴があるか
ら、排水のＣＯＤを効率よく低下させることができる。If wastewater mixed with water-soluble hydraulic oil is treated by such a method, the BOD of the wastewater can be efficiently reduced first by activated sludge treatment. Next, if activated carbon adsorption treatment is performed, COD-causing substances remaining in the treated water after activated sludge treatment are easily adsorbed by activated carbon, so that COD of wastewater can be efficiently reduced.
【００１０】また、活性汚泥処理法を膜分離活性汚泥法
とすれば活性汚泥処理の効率を高められると共に、膜分
離された一次処理水に残留するＣＯＤ原因物質は活性炭
に吸着され易い性質があって、更にＣＯＤを低下させる
ことが可能となる。Further, if the activated sludge treatment method is a membrane separation activated sludge method, the efficiency of the activated sludge treatment can be enhanced, and the COD-causing substances remaining in the membrane-separated primary treatment water are easily adsorbed by activated carbon. Thus, the COD can be further reduced.
【００１１】また、ＢＯＤ原因物質は活性炭表面に微生
物を発生させてその吸着力を低下させるから、ＢＯＤ原
因物質は十分に除去してから活性炭吸着処理を行わなく
てはならない。実験的にはＢＯＤを排水１０００ｃｃ当
たり３０ｍｇ以下とすればＢＯＤ原因物質による活性炭
の吸着性能阻害はほとんど認められない。ＢＯＤに関す
る排出基準が３０ｍｇ以下に定められている場合には、
活性汚泥処理の段階でＢＯＤ原因物質を排出基準以下と
しておくことが好ましい。ＢＯＤは処理槽中の排水の滞
留時間を調節する方法で調節することができる。[0011] Further, since the BOD causing substance generates microorganisms on the surface of the activated carbon and lowers its adsorptive power, the activated carbon adsorption treatment must be performed after the BOD causing substance is sufficiently removed. Experimentally, when the BOD is set to 30 mg or less per 1,000 cc of wastewater, the BOD causative substance hardly inhibits the adsorption performance of activated carbon. If the emission standard for BOD is set at 30 mg or less,
It is preferable that the BOD-causing substance be set to an emission standard or less at the stage of the activated sludge treatment. The BOD can be adjusted by adjusting the residence time of the wastewater in the treatment tank.
【００１２】[0012]
【発明の実施の形態】（実験１）DESCRIPTION OF THE PREFERRED EMBODIMENTS (Experiment 1)
【００１３】[0013]
【表１】 [Table 1]
【００１４】[0014]
【表２】 [Table 2]
【００１５】水溶性の作動油を含む排水のモデルとして
１ｇのユシロンピックＨＦＣ４３を１０００ｃｃの蒸留
水に混入させた試験水（その分析結果を表１に示す）を
調製し凝集沈殿法により処理した（被処理水の分析結果
を表２に示す）。表１及び表２の結果によればＣＯＤは
被処理水１０００ｃｃ当たり６００ｍｇが５６０ｍｇと
なり、ＢＯＤは同じく４２０ｍｇが３００ｍｇと低下し
たが、例えば、愛知県の条例で定められている排水基準
ではＣＯＤが同じく２０ｍｇ、ＢＯＤが同じく２５ｍｇ
であるから、十分に処理できたとは言い難い。As a model of waste water containing a water-soluble hydraulic oil, test water prepared by mixing 1 g of Usilonpick HFC43 in 1000 cc of distilled water (the analysis result is shown in Table 1) was prepared and treated by the coagulation sedimentation method (see Table 1). The analysis results of the water to be treated are shown in Table 2). According to the results of Tables 1 and 2, the COD was 600 mg per 1000 cc of treated water and the 560 mg was 600 mg, and the BOD was also 420 mg and 300 mg per 100 cc. 20mg, BOD is also 25mg
Therefore, it is hard to say that the processing was sufficient.
【００１６】ここにおいて、凝集剤として硫酸バンドを
被処理水１０００ｃｃ当たり３００ｍｇ、消石灰を被処
理水１０００ｃｃ当たり２００ｍｇ使用した。また、フ
ロックは０．００１ｍｍの粗さであるろ紙を使用して吸
引ろ過をにより分離し、分析は日本工業規格（ＪＩＳＫ
０１０２）に定められた方法により行った。Here, as a coagulant, a sulfate band was used in an amount of 300 mg per 1000 cc of water to be treated, and slaked lime was used in an amount of 200 mg per 1000 cc of water to be treated. The floc was separated by suction filtration using a filter paper having a roughness of 0.001 mm, and analyzed by Japanese Industrial Standards (JISK).
0102).
【００１７】（実験２）(Experiment 2)
【００１８】[0018]
【表３】 [Table 3]
【００１９】次に、実験１と同じ試験水を逆浸透法によ
り処理した（被処理水の分析結果を表３に示す）。表３
の結果によればＣＯＤは被処理水１０００ｃｃ当たり２
５０ｍｇとなり、ＢＯＤは同じく１６０ｍｇと低下した
がやはり前記の理由で不十分である。Next, the same test water as in Experiment 1 was treated by the reverse osmosis method (analysis results of the water to be treated are shown in Table 3). Table 3
According to the results, COD was 2 per 1000 cc of water to be treated.
It became 50 mg, and the BOD also decreased to 160 mg, but it was still insufficient for the above-mentioned reason.
【００２０】ここにおいて、逆浸透膜は０．１５％Ｎａ
Ｃｌ水阻止率が９５％である日東電工製の商品記号ＮＴ
Ｒ−７２９ＨＦを使用した。分析は日本工業規格（ＪＩ
ＳＫ０１０２）に定められた方法により行った。Here, the reverse osmosis membrane is 0.15% Na
Product code NT manufactured by Nitto Denko with Cl water rejection of 95%
R-729HF was used. Analysis is based on Japanese Industrial Standards (JI
SK0102).
【００２１】（実験３）(Experiment 3)
【００２２】[0022]
【表４】 [Table 4]
【００２３】次に、実験１と同じ試験水を限外ろ過法に
より処理した（被処理水の分析結果を表４に示す）。表
４の結果によればＣＯＤは被処理水１０００ｃｃ当たり
４７０ｍｇとなり、ＢＯＤは同じく３１０ｍｇと低下し
たがやはり前記の理由で不十分である。Next, the same test water as in Experiment 1 was treated by the ultrafiltration method (analysis results of the water to be treated are shown in Table 4). According to the results in Table 4, the COD was 470 mg per 1000 cc of water to be treated, and the BOD was also reduced to 310 mg, but it was still insufficient for the above-mentioned reason.
【００２４】ここにおいて、限外ろ過膜は分画分子量が
２００００である日東電工製の商品記号ＮＴＵ−２１２
０を使用した。分析は日本工業規格（ＪＩＳＫ０１０
２）に定められた方法により行った。Here, the ultrafiltration membrane has a molecular weight cut-off of 20000, trade name NTU-212 manufactured by Nitto Denko Corporation.
0 was used. The analysis is based on Japanese Industrial Standards (JISK010)
Performed according to the method specified in 2).
【００２５】（実施例１）(Example 1)
【００２６】[0026]
【表５】 [Table 5]
【００２７】次に、実験１と同じ試験水を本発明の方法
により処理した（被処理水の分析結果を表５に示す）。
表５の結果によれば、まず接触酸化法による活性汚泥処
理によりＣＯＤは被処理水１０００ｃｃ当たり１５０ｍ
ｇとなり、ＢＯＤは同じく９ｍｇと低下した。依然ＣＯ
Ｄが高いが活性汚泥処理ではＢＯＤがこれだけ低下する
と処理を続けることができない。しかし、続いて活性炭
吸着処理を行えば、ＣＯＤを同じく１３ｍｇに低下させ
ることができた。Next, the same test water as in Experiment 1 was treated by the method of the present invention (analysis results of the water to be treated are shown in Table 5).
According to the results shown in Table 5, first, COD was reduced to 150 m per 1000 cc of water to be treated by the activated sludge treatment by the catalytic oxidation method.
g, and the BOD also dropped to 9 mg. Still CO
Although D is high, in activated sludge treatment, if the BOD decreases by this amount, the treatment cannot be continued. However, if the subsequent activated carbon adsorption treatment was performed, the COD could be reduced to 13 mg as well.
【００２８】ここにおいて、活性汚泥処理は０．０２２
ｍ3の曝気槽に接触材としてデイビイエス製の商品名Ｄ
Ｂレース延べ１２ｍを張り、毎時０．２ｍ3の曝気を行
って、滞留時間は２４時間とした。活性炭吸着処理は新
東ブレーター製のコール炭である商品記号ＦＣ−５００
を充填した吸着塔を毎時８ｍの速度で通過させて行っ
た。また、分析は日本工業規格（ＪＩＳＫ０１０２）に
定められた方法により行った。Here, the activated sludge treatment is 0.022
Deibiiesu trade name D as a contact material to the aeration tank m 3
Race B was stretched for a total of 12 m, aerated at 0.2 m 3 per hour, and the residence time was set to 24 hours. Activated carbon adsorption treatment is a product code FC-500, which is a coal charcoal made by Shinto Breta.
At a speed of 8 m / h. The analysis was performed according to the method specified in Japanese Industrial Standards (JIS K0102).
【００２９】（実施例２）(Example 2)
【００３０】[0030]
【表６】 [Table 6]
【００３１】次に、実験１と同じ試験水を本発明の別の
方法により処理した（被処理水の分析結果を表６に示
す）。表６の結果によれば、まず膜ろ過法による活性汚
泥処理によりＣＯＤは被処理水１０００ｃｃ当たり１３
０ｍｇとなり、ＢＯＤは同じく５ｍｇと低下した。続く
活性炭吸着処理によりＣＯＤを同じく３ｍｇに低下させ
ることができた。Next, the same test water as in Experiment 1 was treated by another method of the present invention (analysis results of the water to be treated are shown in Table 6). According to the results in Table 6, first, COD was reduced to 13 per 1000 cc of water to be treated by activated sludge treatment by the membrane filtration method.
0 mg, and the BOD was also reduced to 5 mg. Subsequent activated carbon adsorption treatment was able to reduce COD to 3 mg as well.
【００３２】ここにおいて、活性汚泥処理は０．０２２
ｍ3の曝気槽に毎時０．２ｍ3の曝気を行った。処理液
は、被処理液の滞留時間が２４時間となるように、定量
ポンプにより被処理液中から三菱レーヨン製中空糸膜商
品名ステラポア（分画分子量０．１ミクロン）により分
離した。活性炭吸着処理は新東ブレーター製のコール炭
である商品記号ＦＣ−５００を充填した吸着塔を毎時１
５ｍの速度で通過させて行った。また、分析は日本工業
規格（ＪＩＳＫ０１０２）に定められた方法により行っ
た。 （実験４）Here, the activated sludge treatment is 0.022
It was aeration per hour 0.2m 3 to the aeration tank of m 3. The treatment liquid was separated from the liquid to be treated by a metering pump using Stellapore (trade name: 0.1 micron) with a hollow fiber membrane manufactured by Mitsubishi Rayon so that the residence time of the treatment liquid was 24 hours. Activated carbon adsorption treatment is carried out by using an adsorption tower packed with Shinto Blater coal coal, product code FC-500, at an hourly rate.
Passing was performed at a speed of 5 m. The analysis was performed according to the method specified in Japanese Industrial Standards (JIS K0102). (Experiment 4)
【００３３】[0033]
【表７】 [Table 7]
【００３４】次に、比較のために試験水、実験２及び実
験３の処理水を前記実施例と同じ条件で活性炭吸着処理
した（被処理水の分析結果を表７に示す）。表７の結果
によれば試験水を処理した比較例ＡはＣＯＤが被処理水
１０００ｃｃ当たり４１０ｍｇ、逆浸透法の処理水を処
理した比較例ＢはＣＯＤが同様に２５０ｍｇ、限外ろ過
法の処理水を処理した比較例ＣはＣＯＤが同様に４２０
ｍｇであっていずれも十分に処理されたとは言い難い。Next, for comparison, the test water and the treated waters of Experiments 2 and 3 were subjected to activated carbon adsorption treatment under the same conditions as in the above Examples (analysis results of the water to be treated are shown in Table 7). According to the results in Table 7, Comparative Example A treated with test water has a COD of 410 mg per 1000 cc of water to be treated, Comparative Example B treated with reverse osmosis treated water has a COD of 250 mg similarly, and treated with an ultrafiltration method. Comparative Example C treated with water had a COD of 420
mg, and it is hard to say that all were sufficiently processed.
【００３５】[0035]
【発明の効果】本発明の水溶性作動油剤を含む排水の処
理方法は、以上説明したように構成されているので、以
下に記載されるような効果を奏する。第１段階として活
性汚泥処理を行うからＢＯＤを十分に低下させることが
できると共に、第２段階として活性炭吸着処理を行うか
ら、活性汚泥処理後の処理水に含まれるＣＯＤの原因物
質は活性炭に吸着され易い特性を備えていて、ＣＯＤを
十分に低下させることができる。The method for treating wastewater containing a water-soluble hydraulic fluid according to the present invention has the following effects because it is configured as described above. Since the activated sludge treatment is performed as the first step, the BOD can be sufficiently reduced, and the activated carbon adsorption treatment is performed as the second step. Therefore, the COD causing substance contained in the treated water after the activated sludge treatment is adsorbed on the activated carbon. It has characteristics that make it easy to reduce COD.
【００３６】このような排水処理法を採用すれば、水溶
性作動油剤を使用したとしても従来のように排水処理に
困るということがない。従って、積極的に水溶性作動油
剤を使用して工場の火災の危険性を少なくすることが可
能となる。また、そのために特に複雑な設備や制御を必
要とすることがないから、設備コスト、ランニングコス
ト共に従来の排水処理のレベルから大きく逸脱すること
はない。If such a wastewater treatment method is employed, even if a water-soluble hydraulic fluid is used, the wastewater treatment will not be troublesome as in the prior art. Therefore, it is possible to reduce the risk of fire in a factory by actively using a water-soluble hydraulic fluid. In addition, since there is no need for particularly complicated equipment and control, both the equipment cost and the running cost do not greatly deviate from the level of the conventional wastewater treatment.
Claims (3)
することを特徴とする水溶性作動油剤を含む排水の処理
方法。1. A method for treating wastewater containing a water-soluble hydraulic oil, wherein the wastewater after activated sludge treatment is subjected to activated carbon adsorption treatment.
る請求項１記載の水溶性作動油剤を含む排水の処理方
法。2. The method for treating wastewater containing a water-soluble hydraulic fluid according to claim 1, wherein the activated sludge treatment is a membrane separation activated sludge treatment.
水１０００ｃｃ当たり３０ｍｇ以下であることを特徴と
する請求項１又は請求項２記載の水溶性作動油剤を含む
排水の処理方法。3. The method for treating wastewater containing a water-soluble hydraulic oil according to claim 1, wherein the activated sludge treatment has a BOD value after treatment of 30 mg or less per 1,000 cc of wastewater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10103497A JPH11277088A (en) | 1998-03-30 | 1998-03-30 | Treatment of waste water containing water-soluble hydraulic fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10103497A JPH11277088A (en) | 1998-03-30 | 1998-03-30 | Treatment of waste water containing water-soluble hydraulic fluid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11277088A true JPH11277088A (en) | 1999-10-12 |
Family
ID=14355637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10103497A Pending JPH11277088A (en) | 1998-03-30 | 1998-03-30 | Treatment of waste water containing water-soluble hydraulic fluid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11277088A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011177608A (en) * | 2010-02-26 | 2011-09-15 | Toray Ind Inc | Oil-containing waste water treatment method |
| CN102872814A (en) * | 2012-08-28 | 2013-01-16 | 常州大学 | Composite adsorbing material for removing nickel ions in natural water and preparation method thereof |
| CN104492433A (en) * | 2014-12-18 | 2015-04-08 | 太原科技大学 | Adsorption catalyst based on activated carbon felt base as well as preparation method and application of adsorption catalyst |
-
1998
- 1998-03-30 JP JP10103497A patent/JPH11277088A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011177608A (en) * | 2010-02-26 | 2011-09-15 | Toray Ind Inc | Oil-containing waste water treatment method |
| CN102872814A (en) * | 2012-08-28 | 2013-01-16 | 常州大学 | Composite adsorbing material for removing nickel ions in natural water and preparation method thereof |
| CN104492433A (en) * | 2014-12-18 | 2015-04-08 | 太原科技大学 | Adsorption catalyst based on activated carbon felt base as well as preparation method and application of adsorption catalyst |
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