JPH0410397B2 - - Google Patents
Info
- Publication number
- JPH0410397B2 JPH0410397B2 JP26230485A JP26230485A JPH0410397B2 JP H0410397 B2 JPH0410397 B2 JP H0410397B2 JP 26230485 A JP26230485 A JP 26230485A JP 26230485 A JP26230485 A JP 26230485A JP H0410397 B2 JPH0410397 B2 JP H0410397B2
- Authority
- JP
- Japan
- Prior art keywords
- oil
- tank
- scum
- floating
- containing wastewater
- 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.)
- Expired
Links
- 239000002351 wastewater Substances 0.000 claims description 23
- 238000005188 flotation Methods 0.000 claims description 21
- 238000000926 separation method Methods 0.000 claims description 13
- 239000000839 emulsion Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000005345 coagulation Methods 0.000 claims description 6
- 230000015271 coagulation Effects 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 46
- 235000019198 oils Nutrition 0.000 description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000002253 acid Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000701 coagulant Substances 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 229910000000 metal hydroxide Inorganic materials 0.000 description 2
- 150000004692 metal hydroxides Chemical class 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 229910018626 Al(OH) Inorganic materials 0.000 description 1
- 235000019482 Palm oil Nutrition 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 230000000573 anti-seizure effect Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000002540 palm oil Substances 0.000 description 1
- 239000010731 rolling oil Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000003760 tallow Substances 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
Landscapes
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Physical Water Treatments (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、含油廃水の処理方法に関するもので
あり、例えば冷間圧延工場から発生する含油廃水
の処理方法等に好適に適用しうる含油廃水処理方
法に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for treating oil-containing wastewater, and for example, an oil-containing wastewater that can be suitably applied to a method for treating oil-containing wastewater generated from a cold rolling mill. This relates to a processing method.
冷間圧延においては、冷却、焼付防止、潤滑等
のために、ソリブル油、牛脂、パーム油、植物油
等の圧延油と水とをスプレーノズルでロールに吹
き付けており、その含油廃水は、従来は第２図に
示すような処理設備によつて処理されていた。
In cold rolling, rolling oil such as soluble oil, tallow, palm oil, vegetable oil, etc. and water are sprayed onto the rolls using a spray nozzle for cooling, anti-seizure, lubrication, etc., and the oil-containing wastewater is conventionally It was processed using processing equipment as shown in Figure 2.
第２図において、含油廃水はまず分離槽２１に
送られて浮上油を分離除去された後、第１段の加
圧浮上分離装置２２に送られる。ここでは、まず
急速撹拌層２３で酸、アルカリの薬注によるPHコ
ントロールと無機凝集剤によるエマルジヨンブレ
ークが行われ、緩速撹拌槽２４で有機凝集剤によ
るフロツクの粗大化が行われ、浮上分離層２５で
成長したフロツクに微細な空気泡を付着させて浮
上させ、浮上したスカムが掻き寄せられてスカム
槽２６に送られる。また、処理水をより清澄にす
るため、上記第１段の加圧浮上分離装置２２と同
様の構造をなす第２段の加圧浮上分離装置２７が
設けられ、同様の処理が再度行なわれる。その
後、処理水は中和槽２８でPH値を調整されて放流
または再利用される。一方、スカム槽２６のスカ
ムは、濃縮機２９で水分を落として焼却して処分
される。 In FIG. 2, oil-containing wastewater is first sent to a separation tank 21 where floating oil is separated and removed, and then sent to a first-stage pressurized flotation separator 22. Here, first, in the rapid stirring layer 23, PH control is performed by injecting acids and alkalis, and emulsion breaking is performed using an inorganic flocculant, and in the slow stirring tank 24, flocs are coarsened by an organic flocculant, and then floated and separated. Fine air bubbles are attached to the flocs grown in the layer 25 to make them float, and the floating scum is collected and sent to the scum tank 26. Further, in order to make the treated water clearer, a second stage pressure flotation separation device 27 having a similar structure to the first stage pressure flotation separation device 22 is provided, and the same treatment is performed again. Thereafter, the pH value of the treated water is adjusted in the neutralization tank 28 and the water is discharged or reused. On the other hand, the scum in the scum tank 26 is disposed of by removing moisture in a concentrator 29 and incinerating it.
ところが、このような処理方法では、分離槽２
１だけでは浮上油を完全に分離することが困難で
ある。そのため、次工程の廃水中に浮上油が混入
し、エマルジヨンブレークのために多量の凝集剤
が必要になるという問題があり、また浮上スカム
に浮上油が混入するとスカムの脱水、ハンドリン
グに問題を生ずることになる。 However, in this treatment method, the separation tank 2
It is difficult to completely separate the floating oil using only 1. Therefore, there is a problem that floating oil gets mixed into the wastewater of the next process, and a large amount of flocculant is required for emulsion breaking.Furthermore, when floating oil gets mixed into the floating scum, it causes problems in dewatering and handling of the scum. will occur.
また、浮上スカムは通常１〜２％で排出される
ため、焼却処理を行うためには上記のように濃縮
する必要があり、また酸分解してスカムから油を
分離する場合においても、濃縮することにより酸
の添加量を少なくすることができる。そのための
浮上スカムの濃縮法としては、デカンターによ
る遠心分離法、ろ布による重力脱水法、風乾
床による天日乾燥法等があるが、上記の方法
は薬品の添加が必要であり、また上記の方法は
場所と臭気の問題があり、浮上スカムの濃縮に特
別な、しかも問題のある脱水設備を必要とすると
いう問題がある。 In addition, since floating scum is normally discharged at a concentration of 1 to 2%, it is necessary to concentrate it as described above in order to perform incineration treatment, and when separating oil from scum by acid decomposition, it is necessary to concentrate it. This allows the amount of acid added to be reduced. Methods for concentrating floating scum include centrifugation using a decanter, gravity dehydration using a filter cloth, and sun drying using an air drying bed, but the above methods require the addition of chemicals, and The method suffers from space and odor issues, and requires special and problematic dewatering equipment to concentrate the floating scum.
本発明は上記従来の問題点を解決するためにな
されたものであつて、含油廃水から浮上油を完全
に分離除去してエマルジヨンブレークのための凝
集剤の添加量を少なくすることができ、かつスカ
ムの濃縮も特別な脱水設備なしで行える含油廃水
の処理方法の提供を目的とするものである。
The present invention has been made to solve the above-mentioned conventional problems, and it is possible to completely separate and remove floating oil from oil-containing wastewater and reduce the amount of flocculant added for emulsion breaking. Another object of the present invention is to provide a method for treating oil-containing wastewater that allows scum to be concentrated without special dehydration equipment.
本発明にかかる含油廃水の処理方法は、含油廃
水から油分離槽にて浮上油を分離した後、無薬注
で加圧浮上槽にてさらに浮上油を分離して浮上油
を２段階で除去し、その後エマルジヨンブレーク
し凝集剤の添加して、分離された油分を凝集加圧
浮上濃縮槽にてスカムとして浮上させるとともに
濃縮して除去することを特徴とするものである。
The method for treating oil-containing wastewater according to the present invention involves separating floating oil from oil-containing wastewater in an oil separation tank, and then further separating the floating oil in a pressurized flotation tank without using chemicals to remove the floating oil in two stages. Then, an emulsion is broken, a flocculant is added, and the separated oil is floated as scum in a flocculation and pressurized flotation concentration tank, and is concentrated and removed.
以下、本発明の一実施例を第１図に基づいて説
明する。まず、処理設備の概略を含油廃水の流れ
に沿つて説明すると、含油廃水は油分離層１に供
給され、原水槽２からポンプ３にて加圧浮上槽４
に送られる。この加圧浮上槽４では廃水が循環水
ポンプ５で循環され、循環中に空気を混合された
後、滞溜槽６を経て流入廃水に混合される。廃水
はこの加圧浮上槽４から混合槽７・反応槽８を介
して凝集加圧浮上濃縮槽９に供給される。この凝
集加圧浮上濃縮槽９においても、廃水は循環水ポ
ンプ１０で循環され、循環中に空気を混合された
後、滞溜槽１１を介して流入廃水に混合される。
An embodiment of the present invention will be described below with reference to FIG. First, the outline of the treatment equipment will be explained along the flow of oil-containing wastewater. Oil-containing wastewater is supplied to an oil separation layer 1, and is transferred from a raw water tank 2 to a pressurized flotation tank 4 by a pump 3.
sent to. In this pressurized flotation tank 4, wastewater is circulated by a circulating water pump 5, and after being mixed with air during circulation, it is mixed with inflowing wastewater via a retention tank 6. The wastewater is supplied from this pressurized flotation tank 4 to a coagulation pressurized flotation concentration tank 9 via a mixing tank 7 and a reaction tank 8. In this coagulation pressurized flotation concentration tank 9 as well, the wastewater is circulated by the circulating water pump 10, and after being mixed with air during the circulation, it is mixed with the inflowing wastewater via the retention tank 11.
次に、上記処理設備による処理方法を説明す
る。含油廃水は油分離層１にて浮上油が分離され
る。この分離層１での滞溜時間は約２〜３時間程
度と、従来の12時間程度に比して飛躍的に短くす
ることができる。廃水中に若干残留した浮上油
は、次の加圧浮上槽４にて無薬注で分離浮上さ
れ、浮上油とエマルジヨン油とが完全に分離され
る。この加圧浮上槽４においては、循環率が20〜
50％、圧力が４Kg／cm2ｇ、空気量が循環量の２〜
４％程度の加圧浮上条件に設定されている。これ
ら油分離槽１及び加圧浮上槽４で分離除去された
浮上油は焼却される。次に、浮上油を完全に除去
された廃水に、混合層７に入る前に約５〜20mg／
の有機系のエマルジヨンブレークが注入され
る。これによつて、次に混合槽７で注入する無機
凝集剤の注入量を３分の１程度にすることができ
る。更に、無機凝集剤の注入量が少ないと、スカ
ムを濃縮した場合にAl（OH）3、Fe（OH）3等の金
属水酸化物が少なくなり、油分が濃くなるため、
濃縮スカムの取扱いが容易となり、省エネルギー
ともなる。混合層７では無機凝集剤を注入して完
全にエマルジヨンブレークする。その際、無機凝
集剤のみを添加してPHを４〜６と若干低下させる
ことにより、エマルジヨンブレーク８機能を促進
させることができる。エマルジヨンブレークされ
た廃水は、反応槽８においてアルカリ剤にて放流
可能なPHでかつ凝集及び油の処理に最適にPHであ
るあるPH６，０〜７，０に調整される。エマルジ
ヨンブレークされて水と分離した油分は、無機凝
集剤の金属水酸化物とともにスカムを形成し、凝
集加圧浮上濃縮槽９にて空気を付着されて浮上ス
カムとなる。この凝集加圧浮上濃縮槽９において
は、循環率が25〜50％、圧力が４Kg／cm2ｇ、空気
量が循環水の２〜４％の加圧浮上条件で作動され
る。この条件においても適当な滞留時間（２〜
24HR）とスカム厚み（50〜500mm）を確保する
ことにより、浮上スカムは10〜30％まで濃縮され
る。こうして濃縮されたスカムは、そのまま焼却
され、処理水は放流される。 Next, a processing method using the above processing equipment will be explained. Floating oil is separated from the oil-containing wastewater in an oil separation layer 1. The residence time in the separation layer 1 is approximately 2 to 3 hours, which is significantly shorter than the conventional 12 hours. The floating oil slightly remaining in the wastewater is separated and floated in the next pressurized flotation tank 4 without chemical injection, and the floating oil and emulsion oil are completely separated. In this pressurized flotation tank 4, the circulation rate is 20~
50%, pressure is 4Kg/cm 2 g, air amount is 2~2 of circulation amount
The pressurized levitation condition is set at about 4%. The floating oil separated and removed in the oil separation tank 1 and the pressurized flotation tank 4 is incinerated. Next, the wastewater from which the floating oil has been completely removed is added approximately 5 to 20 mg/ml before entering the mixed layer 7.
An organic emulsion break is injected. As a result, the amount of inorganic flocculant to be injected next in the mixing tank 7 can be reduced to about one-third. Furthermore, if the amount of inorganic flocculant injected is small, metal hydroxides such as Al(OH) 3 and Fe(OH) 3 will decrease when the scum is concentrated, and the oil content will become thicker.
Concentrated scum can be handled easily and energy can be saved. In the mixed layer 7, an inorganic flocculant is injected to completely break the emulsion. At that time, the emulsion break 8 function can be promoted by adding only an inorganic flocculant to slightly lower the pH to 4 to 6. The emulsion-broken wastewater is adjusted to a pH of 6.0 to 7.0 using an alkaline agent in the reaction tank 8, which is a pH that can be discharged and is optimal for coagulation and oil treatment. The oil separated from water by emulsion breaking forms scum together with the inorganic flocculant metal hydroxide, and air is attached to it in the coagulation pressurized flotation concentration tank 9 to form floating scum. This coagulation pressurized flotation concentration tank 9 is operated under pressurized flotation conditions in which the circulation rate is 25 to 50%, the pressure is 4 kg/cm 2 g, and the amount of air is 2 to 4% of the circulating water. Even under these conditions, an appropriate residence time (2~
24HR) and scum thickness (50-500mm), the floating scum can be concentrated to 10-30%. The scum thus concentrated is incinerated as is, and the treated water is discharged.
本発明の含油廃水の処理方法によれば、以上の
ように、浮上油を油分離槽で分離させる工程の後
段に、無薬注の加圧浮上槽で浮上油を分離させる
工程を設けていることにより、油分離槽での滞留
時間を従来に比べて格段に短くできるとともに、
浮上油を完全に除去することができ、その結果、
次工程ではエマルジヨン化した油分のみを処理す
ればよいことになる。これによつてエマルジヨン
ブレーク及び凝集剤の注入量を低減することがで
きる。また、そのためにスカムを濃縮した場合
に、凝集剤による金属酸化物が少なくなり油分が
濃くなるため、濃縮スカムの取扱いが容易になる
とともに、焼却時に省エネルギーを図ることがで
きる。さらに、特別なスカムの濃縮設備と薬品を
必要とせずにスカムを濃縮できる。従つて、含油
廃水処理の迅速化、設備の簡略化、薬品の節約、
省エネルギー、省スペース等の効果を奏する。
According to the oil-containing wastewater treatment method of the present invention, as described above, the step of separating the floating oil in a chemical-free pressurized flotation tank is provided after the step of separating the floating oil in the oil separation tank. By doing so, the residence time in the oil separation tank can be significantly shortened compared to conventional methods, and
Floating oil can be completely removed, resulting in
In the next step, only the emulsified oil needs to be treated. This makes it possible to reduce the amount of emulsion break and coagulant injection. Further, when the scum is concentrated for this purpose, the amount of metal oxides caused by the coagulant decreases and the oil content becomes thicker, making it easier to handle the concentrated scum and saving energy during incineration. Furthermore, the scum can be concentrated without the need for special scum concentration equipment and chemicals. Therefore, it speeds up oil-containing wastewater treatment, simplifies equipment, saves chemicals,
It has effects such as energy saving and space saving.
第１図は本発明の一実施例のフローチヤート、
第２図は従来例のフローチヤートである。
１は油分離槽、４は加圧浮上槽、７は混合槽、
８は反応槽、９は集加圧浮上濃縮槽である。
FIG. 1 is a flowchart of an embodiment of the present invention.
FIG. 2 is a flowchart of a conventional example. 1 is an oil separation tank, 4 is a pressurized flotation tank, 7 is a mixing tank,
8 is a reaction tank, and 9 is a collection pressure flotation concentration tank.
Claims (1)
後、無薬注で加圧浮上槽にてさらに浮上油を分離
して浮上油を２段階で除去し、その後エマルジヨ
ンブレークし凝集剤を添加して、分離された油分
を凝集加圧浮上濃縮槽にてスカムとして浮上させ
るとともに濃縮して除去することを特徴とする含
油廃水の処理方法。1 After separating the floating oil from oil-containing wastewater in an oil separation tank, the floating oil is further separated in a pressurized flotation tank without chemical injection, and the floating oil is removed in two stages.Then, the emulsion is broken and a flocculant is removed. A method for treating oil-containing wastewater, which comprises adding the separated oil to the surface as scum in a coagulation and pressure flotation concentration tank, and concentrating and removing the oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26230485A JPS62121688A (en) | 1985-11-20 | 1985-11-20 | Method for treating oil-containing waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26230485A JPS62121688A (en) | 1985-11-20 | 1985-11-20 | Method for treating oil-containing waste water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62121688A JPS62121688A (en) | 1987-06-02 |
| JPH0410397B2 true JPH0410397B2 (en) | 1992-02-25 |
Family
ID=17373924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26230485A Granted JPS62121688A (en) | 1985-11-20 | 1985-11-20 | Method for treating oil-containing waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62121688A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016007600A (en) * | 2014-06-26 | 2016-01-18 | 栗田工業株式会社 | Oil-water separation method and oil-water separation agent for oil-containing scum or oil-containing wastewater |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226381A (en) * | 2011-05-05 | 2011-10-26 | 威海怡和专用设备制造股份有限公司 | Method for treating abandoned drilling fluid of oilfield |
| CN102992558B (en) * | 2012-11-26 | 2015-05-20 | 司军 | Method and system for capturing and masking heavy metal in well drilling wastes |
| KR101265740B1 (en) * | 2013-01-16 | 2013-05-20 | 배희동 | Development of integrated process technology for renewable energy and feed resources production with palm oil mill effluent, palm oil decanter cake, palm kernel shell and palm kernel cake from palm oil mill process |
| JP6372347B2 (en) * | 2014-12-24 | 2018-08-15 | 栗田工業株式会社 | Method for reducing the viscosity of oil-impregnated scum |
-
1985
- 1985-11-20 JP JP26230485A patent/JPS62121688A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016007600A (en) * | 2014-06-26 | 2016-01-18 | 栗田工業株式会社 | Oil-water separation method and oil-water separation agent for oil-containing scum or oil-containing wastewater |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62121688A (en) | 1987-06-02 |
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