JP5910591B2 - Method for reducing viscosity of oil-impregnated scum and method for reducing viscosity of oil-containing wastewater - Google Patents
Method for reducing viscosity of oil-impregnated scum and method for reducing viscosity of oil-containing wastewater Download PDFInfo
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- JP5910591B2 JP5910591B2 JP2013190639A JP2013190639A JP5910591B2 JP 5910591 B2 JP5910591 B2 JP 5910591B2 JP 2013190639 A JP2013190639 A JP 2013190639A JP 2013190639 A JP2013190639 A JP 2013190639A JP 5910591 B2 JP5910591 B2 JP 5910591B2
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- 239000002351 wastewater Substances 0.000 title claims description 41
- 238000000034 method Methods 0.000 title claims description 27
- 239000002736 nonionic surfactant Substances 0.000 claims description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 43
- 238000000926 separation method Methods 0.000 description 23
- 239000003814 drug Substances 0.000 description 21
- 229940079593 drug Drugs 0.000 description 21
- 239000000126 substance Substances 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 12
- -1 fatty acid ester Chemical class 0.000 description 11
- 150000005215 alkyl ethers Chemical class 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 6
- 238000005097 cold rolling Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000003093 cationic surfactant Substances 0.000 description 3
- FFJCNSLCJOQHKM-CLFAGFIQSA-N (z)-1-[(z)-octadec-9-enoxy]octadec-9-ene Chemical compound CCCCCCCC\C=C/CCCCCCCCOCCCCCCCC\C=C/CCCCCCCC FFJCNSLCJOQHKM-CLFAGFIQSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000259 polyoxyethylene lauryl ether Polymers 0.000 description 2
- 229920002503 polyoxyethylene-polyoxypropylene Polymers 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- RFVNOJDQRGSOEL-UHFFFAOYSA-N 2-hydroxyethyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCO RFVNOJDQRGSOEL-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- YSJGOMATDFSEED-UHFFFAOYSA-M behentrimonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCCCCCC[N+](C)(C)C YSJGOMATDFSEED-UHFFFAOYSA-M 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 238000012840 feeding operation Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- SFVFIFLLYFPGHH-UHFFFAOYSA-M stearalkonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCC[N+](C)(C)CC1=CC=CC=C1 SFVFIFLLYFPGHH-UHFFFAOYSA-M 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- Treatment Of Sludge (AREA)
- Removal Of Floating Material (AREA)
- Processing Of Solid Wastes (AREA)
Description
本発明は、含油スカムの粘度低減方法、及び含油排水の粘度低減方法に関する。 The present invention relates to a method for reducing the viscosity of oil-containing scum and a method for reducing the viscosity of oil-containing wastewater.
冷間圧延等の金属の圧延処理では、潤滑性のための油、冷却のための水が必要であり、含油排水が発生する。このように金属の圧延処理等で生じた含油排水は、油水分離槽において、水分と油分とに分離される。分離した水分は、回収して冷間圧延等で再利用するか、排水処理設備に送られる。油分は分離の際にスカムとして浮上し、この油分を含むスカム（以下、「含油スカム」と称する）は、油水分離槽からポンプで送液され、産業廃棄物として焼却処分される。
含油排水及び含油スカムは、油分の影響により粘度が高くなりやすい。粘度の上昇は低温環境下では顕著であり、特に含油スカムは油分の濃度が高いため粘度が高くなりやすく、油水分離槽からのポンプでの送液作業に深刻な影響を与える。
In a metal rolling process such as cold rolling, oil for lubrication and water for cooling are required, and oil-containing wastewater is generated. Thus, the oil-containing wastewater generated by the metal rolling process or the like is separated into water and oil in the oil-water separation tank. The separated water is collected and reused by cold rolling or sent to a wastewater treatment facility. The oil component floats as scum at the time of separation, and the scum containing the oil component (hereinafter referred to as “oil-containing scum”) is pumped from the oil / water separation tank and incinerated as industrial waste.
Oil-containing wastewater and oil-containing scum tend to have high viscosity due to the effect of oil. The increase in viscosity is remarkable in a low-temperature environment. Particularly, oil-impregnated scum has a high oil concentration, so that the viscosity tends to be high, and seriously affects the liquid feeding operation with a pump from the oil-water separation tank.
含油排水の油水分離処理としては、特許文献１の技術が提案されている。
特許文献１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、その後エマルジョ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ものである。しかし、特許文献１は油水分離のみに着目しており、含油排水や含油スカムの粘度低減に関しては何ら考慮していない。
As an oil-water separation treatment of oil-containing wastewater, the technique of Patent Document 1 has been proposed.
In Patent Document 1, after floating oil is separated from oil-containing wastewater in an oil separation tank, the floating oil is further separated in a pressure floating tank without chemical injection, and the floating oil is removed in two stages, and then an emulsion break occurs. A flocculant is added, and the separated oil is floated as a scum in a flocculated pressurized flotation concentration tank and concentrated to be removed. However, Patent Document 1 focuses only on oil-water separation, and does not take into consideration any reduction in the viscosity of oil-containing wastewater or oil-containing scum.
含油排水や含油スカムの粘度を低減するためには、加温が有効である。特許文献２では、油スラッジを流動化して取り扱い性を向上させるために、油スラッジを加温することを開示している。 Heating is effective for reducing the viscosity of oil-containing wastewater and oil-containing scum. Patent Document 2 discloses heating the oil sludge in order to fluidize the oil sludge and improve the handleability.
しかし、特許文献２のような加温処理は、一連の工程におけるエネルギー消費量が大きくなってしまうという問題がある。
また、含油スカムについては水の添加によっても粘度を低減することが可能であるが、スカムの水分が増加することによって、焼却処分の際に助燃剤が大量に必要となったり、水分の存在により含油スカムの熱量が低下し、含油スカムの再資源化が困難になるという問題がある。
However, the heating process as in Patent Document 2 has a problem that the energy consumption in a series of processes becomes large.
In addition, the viscosity of oil-impregnated scum can be reduced by the addition of water, but due to the increase in the water content of the scum, a large amount of a combustor is required during incineration, or due to the presence of water. There is a problem that the amount of heat of the oil-impregnated scum decreases, making it difficult to recycle the oil-impregnated scum.
本発明は、このような状況下になされたものであり、エネルギーを大量に消費したり、含油スカム中の水分の増加を伴うことなく、含油スカムや含油排水の粘度を低減する方法を提供することを目的とする。 The present invention has been made under such circumstances, and provides a method for reducing the viscosity of oil-containing scum and oil-containing wastewater without consuming a large amount of energy or increasing the water content in the oil-containing scum. For the purpose.
上記課題を解決すべく、本発明は、次の［１］〜［４］を提供する。
［１］含油スカムに対して、ＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤を添加する含油スカムの粘度低減方法。
［２］前記曇点が２０℃以下である上記１に記載の含油スカムの粘度低減方法。
［３］含油排水に対して、ＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤を添加する含油排水の粘度低減方法。
［４］前記曇点が２０℃以下である上記３に記載の含油排水の粘度低減方法。
In order to solve the above problems, the present invention provides the following [1] to [4].
[1] A method for reducing the viscosity of an oil-containing scum , wherein a nonionic surfactant having an HLB value of 14 or less and a cloud point of 60 ° C. or less is added to the oil-containing scum .
[2] The method for reducing the viscosity of oil-impregnated scum as described in 1 above, wherein the cloud point is 20 ° C. or lower.
[3] A method for reducing the viscosity of an oil-containing wastewater, comprising adding a nonionic surfactant having an HLB value of 14 or less and a cloud point of 60 ° C. or less to the oil-containing wastewater.
[4] The method for reducing the viscosity of oil-containing wastewater according to 3 above, wherein the cloud point is 20 ° C. or lower.
本発明の含油スカムの粘度低減方法、及び含油排水の粘度低減方法は、エネルギーを大量に消費したり、含油スカム中の水分の増加を伴うことなく、含油スカム、及び含油排水の粘度を低減できる。 The method for reducing the viscosity of oil-impregnated scum and the method for reducing the viscosity of oil-impregnated waste water of the present invention can reduce the viscosity of oil-impregnated scum and oil-impregnated waste water without consuming a large amount of energy or increasing water in the oil-containing scum. .
［含油スカムの粘度低減方法］
本発明の含油スカムの粘度低減方法は、含油スカムに対して、ＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤を添加するものである。
なお、本発明でいう含油スカムとは、少なくとも油水分離槽で分離した油分（浮上油）を含むものであり、さらに場合により、油水分離時に油分とともに同時に取り出される水分等の油分以外の成分、及び含油スカムに散布する水分等の油水分離後に添加される成分を含むものである。
[Viscosity reduction method for oil-impregnated scum]
The method for reducing the viscosity of an oil-containing scum of the present invention is to add a nonionic surfactant having an HLB value of 14 or less and a cloud point of 60 ° C. or less to the oil-containing scum.
The oil-impregnated scum as used in the present invention includes at least the oil component (floating oil) separated in the oil-water separation tank, and, depending on the case, components other than oil components such as moisture taken out simultaneously with the oil component during oil-water separation, and It contains components added after oil-water separation, such as water sprayed on the oil-containing scum.
本発明の含油スカムの粘度低減方法に適用可能な含油スカムは特に制限されない。含油スカムの由来としては、冷間圧延等の金属の圧延処理等で生じる含油排水が挙げられる。
含油スカム中の油分は特に限定されないが、通常２０〜８０質量％である。
The oil-impregnated scum applicable to the method for reducing the viscosity of the oil-impregnated scum of the present invention is not particularly limited. As the origin of the oil-impregnated scum, an oil-impregnated drainage generated by a metal rolling process such as cold rolling or the like can be mentioned.
The oil content in the oil-containing scum is not particularly limited, but is usually 20 to 80% by mass.
ＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤は、ＨＬＢ値が１４以下であることにより、含油スカムに溶けやすく、曇点が６０℃以下であることにより、曇点を決定しているファクター（分子構造等）の影響により、油成分に作用しやすくなっていると考えられる。そして、ＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤が含油スカム中の油成分に作用すると、油分に含まれるワックス成分の結晶化が阻害され、含油スカムの粘度を低減できると考えられる。また、ＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤が含油スカム中の油成分に作用すると、含油スカム中の油滴の分散を促進することにより、含油スカムの粘度を低減できると考えられる。
このように、ＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤は、含油スカムの粘度低減作用があるため、含油スカムに散布する水の量を減らすことができる。これにより、含油スカム中の水分が減少し、含油スカムを焼却処分する際の助燃剤の添加量を削減できる。また、含油スカム中の水分が減少することにより、含油スカムの熱量が高くなり、回収した含油スカムを再資源化することができる。
また、含油スカムを加熱して粘度を低減する必要がなくなり、蒸気等のエネルギーの使用量を削減できる。
Nonionic surfactants having an HLB value of 14 or less and a cloud point of 60 ° C. or less are easily soluble in oil-impregnated scum when the HLB value is 14 or less, and the cloud point is determined by having a cloud point of 60 ° C. or less. It is thought that it is easy to act on the oil component due to the influence of the factors (molecular structure, etc.). When a nonionic surfactant having an HLB value of 14 or less and a cloud point of 60 ° C. or less acts on the oil component in the oil-containing scum, crystallization of the wax component contained in the oil is inhibited, and the viscosity of the oil-containing scum can be reduced. Conceivable. Further, when a nonionic surfactant having an HLB value of 14 or less and a cloud point of 60 ° C. or less acts on the oil component in the oil-containing scum , the viscosity of the oil-containing scum can be reduced by promoting the dispersion of oil droplets in the oil-containing scum. it is conceivable that.
Thus, since the nonionic surfactant having an HLB value of 14 or less and a cloud point of 60 ° C. or less has an action of reducing the viscosity of the oil-containing scum, the amount of water sprayed on the oil-containing scum can be reduced. Thereby, the water | moisture content in oil-impregnated scum reduces, and the addition amount of the combustion aid at the time of incineration disposal of oil-containing scum can be reduced. Moreover, since the water | moisture content in oil-impregnated scum reduces, the calorie | heat amount of oil-impregnated scum becomes high and the collect | recovered oil-impregnated scum can be recycled.
Further, it is not necessary to reduce the viscosity by heating the oil-containing scum, and the amount of energy such as steam can be reduced.
ノニオン系界面活性剤のＨＬＢ値は１１以下が好ましい。また、ＨＬＢ値は含油スカムへの溶解性の観点から８以上が好適である。ノニオン系界面活性剤の曇点は２０℃以下が好ましい。 The HLB value of the nonionic surfactant is preferably 11 or less. The HLB value is preferably 8 or more from the viewpoint of solubility in oil-containing scum. The cloud point of the nonionic surfactant is preferably 20 ° C. or less.
ＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤としては、ポリオキシアルキレンアルキルエーテル、ポリオキシアルキレン脂肪酸エステル、ポリオキシアルキレンジ脂肪酸エステル及びこれらの誘導体等が挙げられる。
ＨＬＢ値は、親水基と親油基とのバランスにより調整できる。曇点はポリエーテル鎖を長くすることにより低くすることができる。
Examples of the nonionic surfactant having an HLB value of 14 or less and a cloud point of 60 ° C. or less include polyoxyalkylene alkyl ether, polyoxyalkylene fatty acid ester, polyoxyalkylene difatty acid ester, and derivatives thereof.
The HLB value can be adjusted by the balance between the hydrophilic group and the lipophilic group. The cloud point can be lowered by lengthening the polyether chain.
ＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤は、含油スカムの粘度を低減する作用を奏するが、該作用により、硬い油膜中に閉じ込められている水が油膜外に逃げやすくなり、油水分離効果を促進することもできる。含油スカムの油水分離効果により、油水分離の段階ごとに含油スカムの水分を減少させることができる。 A nonionic surfactant having an HLB value of 14 or less and a cloud point of 60 ° C. or less has an effect of reducing the viscosity of the oil-containing scum, but this action makes it easy for water trapped in the hard oil film to escape from the oil film. The oil / water separation effect can also be promoted. Due to the oil-water separation effect of the oil-containing scum, the water content of the oil-containing scum can be reduced at each stage of oil-water separation.
含油スカムに対するＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤の添加量は、含油スカム中の油分に対して、３ｇ／Ｌ〜３０ｇ／Ｌであることが好ましい。
ＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤を添加する箇所は特に制限されない。含油スカム中の水分を減少させる観点からは、含油スカムが得られるより前の箇所、具体的には油水分離槽又は油水分離槽以前の箇所で添加することが好ましい。また、添加量削減の観点からは、油水分離槽の後の配管等で添加することが好ましい。
The addition amount of the nonionic surfactant having an HLB value of 14 or less and a cloud point of 60 ° C. or less with respect to the oil-containing scum is preferably 3 g / L to 30 g / L with respect to the oil content in the oil-containing scum.
The location where the nonionic surfactant having an HLB value of 14 or less and a cloud point of 60 ° C. or less is added is not particularly limited. From the viewpoint of reducing the water content in the oil-containing scum, it is preferable to add the oil-containing scum before the oil-containing scum is obtained, specifically at the oil-water separation tank or the place before the oil-water separation tank. Moreover, it is preferable to add by piping etc. after an oil-water separation tank from a viewpoint of addition amount reduction.
［含油排水の粘度低減方法］
本発明の含油排水の粘度低減方法は、含油排水に対して、ＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤を添加するものである。
[Viscosity reduction method for oil-containing wastewater]
In the method for reducing the viscosity of oil-containing wastewater according to the present invention, a nonionic surfactant having an HLB value of 14 or less and a cloud point of 60 ° C. or less is added to the oil-containing wastewater.
本発明の含油排水の粘度低減方法に適用可能な含油排水は特に制限されず、どのような含油排水でも適用することができる。含油排水としては、冷間圧延等の金属の圧延処理等で生じる排水が挙げられる。
含油排水中の油分は特に限定されないが、金属の圧延処理の排水の場合、通常油分は５０〜５００ｐｐｍである。
The oil-containing wastewater applicable to the method for reducing the viscosity of the oil-containing wastewater of the present invention is not particularly limited, and any oil-containing wastewater can be applied. Examples of the oil-containing wastewater include wastewater generated by a metal rolling process such as cold rolling.
The oil content in the oil-containing wastewater is not particularly limited, but in the case of wastewater for metal rolling treatment, the oil content is usually 50 to 500 ppm.
ＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤は、ＨＬＢ値が１４以下であることにより、含油排水に溶けやすく、曇点が６０℃以下であることにより、曇点を決定しているファクター（分子構造等）の影響により、油成分に作用しやすくなっていると考えられる。そして、ＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤が含油排水中の油成分に作用すると、油分に含まれるワックス成分の結晶化が阻害され、含油排水の粘度を低減できると考えられる。また、ＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤が含油排水中の油成分に作用すると、含油排水中の油滴の分散を促進することにより、含油排水の粘度を低減できると考えられる。 Nonionic surfactants having an HLB value of 14 or less and a cloud point of 60 ° C. or less are easily soluble in oil-containing wastewater when the HLB value is 14 or less, and the cloud point is determined by having a cloud point of 60 ° C. or less. It is thought that it is easy to act on the oil component due to the influence of the factors (molecular structure, etc.). When a nonionic surfactant having an HLB value of 14 or less and a cloud point of 60 ° C. or less acts on the oil component in the oil-containing wastewater, crystallization of the wax component contained in the oil is inhibited, and the viscosity of the oil-containing wastewater can be reduced. Conceivable. Further, when a nonionic surfactant having an HLB value of 14 or less and a cloud point of 60 ° C. or less acts on the oil component in the oil-containing wastewater, the viscosity of the oil-containing wastewater can be reduced by promoting the dispersion of oil droplets in the oil-containing wastewater. it is conceivable that.
ＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤は、含油排水の粘度を低減する作用を奏するが、該作用により、硬い油膜中に閉じ込められている水が油膜外に逃げやすくなり、油水分離効果を促進することもできる。当該油水分離効果により、油水分離槽で得た含油排水の水分を減少させることができる。 Nonionic surfactants with an HLB value of 14 or less and a cloud point of 60 ° C. or less have the effect of reducing the viscosity of the oil-containing wastewater, which makes it easier for water confined in the hard oil film to escape outside the oil film. The oil / water separation effect can also be promoted. Due to the oil / water separation effect, the water content of the oil-containing wastewater obtained in the oil / water separation tank can be reduced.
含油排水に対するＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤の添加量は、排水中の油分に対して、３ｇ／Ｌ〜３０ｇ／Ｌであることが好ましい。 The addition amount of the nonionic surfactant having an HLB value of 14 or less and a cloud point of 60 ° C. or less with respect to the oil-containing wastewater is preferably 3 g / L to 30 g / L with respect to the oil content in the wastewater.
本発明の含油排水の粘度低減方法で用いるＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤の好適な実施態様は、本発明の含油スカムの粘度低減方法で用いるＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤の好適な実施態様と同様である。 A preferred embodiment of the nonionic surfactant having an HLB value of 14 or less and a cloud point of 60 ° C. or less used in the method for reducing the viscosity of oil-containing wastewater of the present invention is an HLB value of 14 or less used in the method for reducing the viscosity of oil-containing scum of the present invention. This is the same as the preferred embodiment of the nonionic surfactant having a cloud point of 60 ° C. or lower.
＜任意添加成分＞
本発明の含油スカムの粘度低減方法及び含油排水の粘度低減方法においては、本発明の目的が損なわれない範囲で、各種の添加成分、例えば、アニオン系界面活性剤、カチオン系界面活性剤等を添加することできる。これらの添加成分は一種単独で又は二種以上を組み合わせて用いることができる。
<Optional components>
In the method for reducing the viscosity of the oil-containing scum and the method for reducing the viscosity of the oil-containing wastewater of the present invention, various additive components such as an anionic surfactant and a cationic surfactant are added within the range in which the object of the present invention is not impaired. Can be added. These additive components can be used alone or in combination of two or more.
次に、本発明を実施例により更に詳細に説明するが、本発明はこれらの例によって何ら限定されるものではない。 EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.
１．含油スカムの粘度低減の検証
［実施例１］
冷間圧延を経た含油排水の油水分離槽で採取した含油スカム（水分５２質量％、油分４８質量％、粘度７．６Ｐａ・ｓ）が入った缶を３０〜４０回撹拌混合した。攪拌した含油スカムを１００ｍｌの試験管に５０ｍｌ注ぎ、薬剤としてノニオン系界面活性剤（ポリオキシエチレンアルキルエーテル；三洋化成工業社製、ナロアクティーCL-50；ＨＬＢ値１０．０、曇点２０℃以下）を添加し、再度含油スカムを注いで、薬剤濃度を１０ｇ／Ｌ（油分に対して２０．８ｇ／Ｌ）に調整した。試験管内の試料をスパチュラで１２０秒攪拌し、含油スカムと薬剤とを混合し、試料温度が２０℃の条件で粘度を測定した。
1. Example 1 for verifying viscosity reduction of oil-impregnated scum
A can containing oil-containing scum (water content: 52 mass%, oil content: 48 mass%, viscosity: 7.6 Pa · s) collected in an oil-water separation tank of oil-containing wastewater that had undergone cold rolling was stirred and mixed 30 to 40 times. 50 ml of stirred oil-impregnated scum is poured into a 100 ml test tube, and a nonionic surfactant (polyoxyethylene alkyl ether; manufactured by Sanyo Chemical Industries, NAROACTY CL-50; HLB value 10.0, cloud point 20 ° C. or less) ) And oil-impregnated scum was poured again to adjust the drug concentration to 10 g / L (20.8 g / L with respect to the oil content). The sample in the test tube was stirred with a spatula for 120 seconds, the oil-containing scum and the drug were mixed, and the viscosity was measured under the condition that the sample temperature was 20 ° C.
［実施例２〜８］、［比較例１〜１０］
薬剤を以下のものに変更した以外は、実施例１と同様にして、含油スカムの粘度を測定した。
（実施例２の薬剤）
ノニオン系界面活性剤（ポリオキシエチレンジ脂肪酸エステル；三洋化成工業社製、イオネットDO-400；ＨＬＢ値８．４、曇点２０℃以下）
（実施例３の薬剤）
ノニオン系界面活性剤（ポリオキシエチレンラウリルエーテル；三洋化成工業社製、エマルミンNL-70；ＨＬＢ値１２．４、曇点５８℃）
（実施例４の薬剤）
ノニオン系界面活性剤（ポリオキシアルキレンアルキルエーテル；三洋化成工業社製、ナロアクティーID-40；ＨＬＢ値８．１、曇点２０℃以下）
（実施例５の薬剤）
ノニオン系界面活性剤（ポリオキシエチレンアルキルエーテル；三洋化成工業社製、サンノニックSS-50；ＨＬＢ値１０．５、曇点２０℃以下）
（実施例６の薬剤）
ノニオン系界面活性剤（ポリオキシエチレンアルキルエーテル；三洋化成工業社製、サンノニックSS-90；ＨＬＢ値１３．２、曇点５６℃）
（実施例７の薬剤）
ノニオン系界面活性剤（ポリオキシエチレンポリオキシプロピレングリコール；三洋化成工業社製、ニューポールPE-61；ＨＬＢ値１．９、曇点２４℃）
（実施例８の薬剤）
ノニオン系界面活性剤（ポリオキシアルキレンアルキルエーテル；三洋化成工業社製、ナロアクティーCL-85；ＨＬＢ値１２．６、曇点４１℃）
[Examples 2 to 8], [Comparative Examples 1 to 10]
Except having changed the chemical | medical agent into the following, it carried out similarly to Example 1, and measured the viscosity of oil-impregnated scum.
(Drug of Example 2)
Nonionic surfactant (polyoxyethylene difatty acid ester; manufactured by Sanyo Chemical Industries, Ionette DO-400; HLB value 8.4, cloud point 20 ° C. or lower)
(Drug of Example 3)
Nonionic surfactant (polyoxyethylene lauryl ether; manufactured by Sanyo Chemical Industries, Emalmine NL-70; HLB value 12.4, cloud point 58 ° C)
(Drug of Example 4)
Nonionic surfactant (polyoxyalkylene alkyl ether; manufactured by Sanyo Chemical Industries, NAROACTY ID-40; HLB value 8.1, cloud point 20 ° C. or less)
(Drug of Example 5)
Nonionic surfactant (polyoxyethylene alkyl ether; Sanyo Chemical Industries, Sannonic SS-50; HLB value 10.5, cloud point 20 ° C or less)
(Drug of Example 6)
Nonionic surfactant (polyoxyethylene alkyl ether; Sanyo Chemical Industries, Sannonic SS-90; HLB value 13.2, cloud point 56 ° C)
(Drug of Example 7)
Nonionic surfactant (polyoxyethylene polyoxypropylene glycol; manufactured by Sanyo Chemical Industries, New Pole PE-61; HLB value 1.9, cloud point 24 ° C.)
(Drug of Example 8)
Nonionic surfactant (polyoxyalkylene alkyl ether; manufactured by Sanyo Chemical Industries, NAROACTY CL-85; HLB value 12.6, cloud point 41 ° C)
（比較例１の薬剤）
ノニオン系界面活性剤（ポリオキシエチレンラウリルエーテル；三洋化成工業社製、エマルミンNL-110；ＨＬＢ値１４．４、曇点９７℃）
（比較例２の薬剤）
ノニオン系界面活性剤（ポリオキシアルキレンアルキルエーテル；三洋化成工業社製、ナロアクティーCL-160；ＨＬＢ値１５．２、曇点９９℃）
（比較例３の薬剤）
ノニオン系界面活性剤（ポリオキシアルキレンアルキルエーテル；三洋化成工業社製、ナロアクティーCL-400；ＨＬＢ値１７．８、曇点１００℃）
（比較例４の薬剤）
ノニオン系界面活性剤（ポリオキシエチレンオレイルエーテルとポリオキシエチレンセチルエーテルの混合物；三洋化成工業社製、エマルミン110；ＨＬＢ値１３．２、曇点７８℃）
（比較例５の薬剤）
ノニオン系界面活性剤（ポリオキシエチレンオレイルエーテルとポリオキシエチレンセチルエーテルの混合物；三洋化成工業社製、エマルミン240；ＨＬＢ値１６．１、曇点１００℃）
（比較例６の薬剤）
ノニオン系界面活性剤（モノステアリン酸ポリエチレングリコール；三洋化成工業社製、イオネットMS-1000；ＨＬＢ値１５．７、曇点１００℃）
（比較例７の薬剤）
ノニオン系界面活性剤（ポリオキシエチレンポリオキシプロピレングリコール；三洋化成工業社製、ニューポールPE-68；ＨＬＢ値１５．７、曇点１００℃）
（比較例８の薬剤）
カチオン系界面活性剤（塩化ステアリルジメチルベンジルアンモニウム；三洋化成工業株式会社製、カチオンS）
（比較例９の薬剤）
カチオン系界面活性剤（塩化ベヘニルトリメチルアンモニウム；三洋化成工業株式会社製、エコノールTM-22）
（比較例１０の薬剤）
ブランク（薬剤は用いない）
(Drug of Comparative Example 1)
Nonionic surfactant (polyoxyethylene lauryl ether; manufactured by Sanyo Chemical Industries, Emalmine NL-110; HLB value 14.4, cloud point 97 ° C)
(Drug of Comparative Example 2)
Nonionic surfactant (polyoxyalkylene alkyl ether; manufactured by Sanyo Chemical Industries, NAROACTY CL-160; HLB value 15.2, cloud point 99 ° C.)
(Drug of Comparative Example 3)
Nonionic surfactant (polyoxyalkylene alkyl ether; manufactured by Sanyo Chemical Industries, NAROACTY CL-400; HLB value 17.8, cloud point 100 ° C.)
(Drug of Comparative Example 4)
Nonionic surfactant (mixture of polyoxyethylene oleyl ether and polyoxyethylene cetyl ether; Sanyo Chemical Industries, Emalmin 110; HLB value 13.2, cloud point 78 ° C)
(Drug of Comparative Example 5)
Nonionic surfactant (mixture of polyoxyethylene oleyl ether and polyoxyethylene cetyl ether; Sanyo Chemical Industries, Emalmin 240; HLB value 16.1, cloud point 100 ° C)
(Drug of Comparative Example 6)
Nonionic surfactant (polyethylene glycol monostearate; manufactured by Sanyo Chemical Industries, Ionette MS-1000; HLB value 15.7, cloud point 100 ° C.)
(Drug of Comparative Example 7)
Nonionic surfactant (polyoxyethylene polyoxypropylene glycol; manufactured by Sanyo Chemical Industries, New Pole PE-68; HLB value 15.7, cloud point 100 ° C.)
(Drug of Comparative Example 8)
Cationic surfactant (stearyldimethylbenzylammonium chloride; manufactured by Sanyo Chemical Industries, Cation S)
(Drug of Comparative Example 9)
Cationic surfactant (behenyltrimethylammonium chloride; manufactured by Sanyo Chemical Industries, Econol TM-22)
(Drug of Comparative Example 10)
Blank (no drug used)
２．含油スカムの油水分離の検証
実施例１〜８及び比較例１〜１０において、粘度測定後に試験管の試料をスパチュラで１２０秒攪拌し、含油スカムと薬剤とを混合した後に２０℃の環境に１８時間静置し、油水分離の状態を目視で観察した。その結果、水層が全体の１／５〜１／４観察できるものを「〇」、水層が１／５未満観察できるものを「△」、油水が分離せず水層が観察できないものを「×」とした。結果を表１に示す。
2. Verification of oil-water separation of oil-containing scum In Examples 1 to 8 and Comparative Examples 1 to 10, the sample in the test tube was stirred with a spatula for 120 seconds after viscosity measurement, and the oil-containing scum and the drug were mixed. It left still for time and observed the state of oil-water separation visually. As a result, “◯” indicates that the water layer can be observed from 1/5 to 1/4 of the whole, “△” indicates that the water layer can be observed less than 1/5, and oil water does not separate and the water layer cannot be observed. It was set as “x”. The results are shown in Table 1.
表１の結果から明らかなように、ＨＬＢ値１４以下、曇点６０℃以下のノニオン系界面活性剤を添加した実施例１〜８は、当初の含油スカムの粘度（７．６Ｐａ・ｓ）を大幅に低減できるものであった。また、実施例２〜７のノニオン系界面活性剤は、油水分離効果にも優れていた。 As is apparent from the results in Table 1, Examples 1 to 8 to which a nonionic surfactant having an HLB value of 14 or less and a cloud point of 60 ° C. or less were added had the viscosity (7.6 Pa · s) of the initial oil-containing scum. It can be greatly reduced. Moreover, the nonionic surfactant of Examples 2-7 was excellent also in the oil-water separation effect.
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