CN101428877A - Method for removing roily oil from degreasing waste liquor in coating wastewater - Google Patents
Method for removing roily oil from degreasing waste liquor in coating wastewater Download PDFInfo
- Publication number
- CN101428877A CN101428877A CNA2008102436147A CN200810243614A CN101428877A CN 101428877 A CN101428877 A CN 101428877A CN A2008102436147 A CNA2008102436147 A CN A2008102436147A CN 200810243614 A CN200810243614 A CN 200810243614A CN 101428877 A CN101428877 A CN 101428877A
- Authority
- CN
- China
- Prior art keywords
- oil
- degreasing
- waste liquor
- wasting liquid
- degreasing wasting
- 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
- 238000005238 degreasing Methods 0.000 title claims abstract description 43
- 239000002351 wastewater Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000011248 coating agent Substances 0.000 title claims description 8
- 238000000576 coating method Methods 0.000 title claims description 8
- 239000002699 waste material Substances 0.000 title abstract description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 239000001117 sulphuric acid Substances 0.000 claims abstract description 11
- 235000011149 sulphuric acid Nutrition 0.000 claims abstract description 11
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 7
- 239000000194 fatty acid Substances 0.000 claims abstract description 7
- 229930195729 fatty acid Natural products 0.000 claims abstract description 7
- 150000004665 fatty acids Chemical class 0.000 claims abstract description 7
- 239000000344 soap Substances 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 33
- 239000007764 o/w emulsion Substances 0.000 claims description 14
- 239000002253 acid Substances 0.000 claims description 10
- 150000002632 lipids Chemical class 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 239000003995 emulsifying agent Substances 0.000 abstract description 3
- 238000010422 painting Methods 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract 1
- 239000003929 acidic solution Substances 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 239000003945 anionic surfactant Substances 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011176 pooling Methods 0.000 description 2
- 235000014347 soups Nutrition 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Floating Material (AREA)
Abstract
The invention discloses a method for removing emulsified oil in degreasing waste liquor of painting wastewater. The degreasing waste liquor enters a degreasing waste liquor tank after being collected, and then is lifted to a reaction tank by a degreasing waste liquor pump; 18 to 22 percent dilute sulfuric acid is added into the reaction tank and is mixed evenly with the degreasing waste liquor; the dosage of the sulphuric acid is controlled through detecting the pH value so that the pH value is between 2 and 3; the degreasing waste liquor modified by the dilute sulfuric acid is discharged into an oil separation bank for standing; and the higher fatty acid soap in the emulsifier is transformed into the water insoluble fatty acid and is separated, and the fatty acid floating on the degreasing waste liquor is scraped into an oil collection barrel by an oil skimming machine. The method has simple devices, little investment, low cost, and obvious effects on emulsified oil removal.
Description
Technical field:
The present invention relates to a kind of method of removing oil in water emulsion in the waste liquid, specifically is the method that degreasing wasting liquid is removed oil in water emulsion in a kind of coating wastewater.
Background technology:
Painting dressing automobiles waste water mainly comes from pre-degreasing, degreasing, table is transferred, phosphatization, vehicle body pretreatment procedures such as passivation, degreasing process generally cleans with thermokalite and organic solvent, alkali lye is by highly basic, weak base, the polymerization basic salt, tensio-active agents etc. are suitably formulated, institute's effluent contains oil in water emulsion, the physico-chemical process treatment process is generally adopted in wastewater treatment in the past, but deoiling effect is not obvious, this is because oil in water emulsion is scattered in the water under the effect of tensio-active agent, because the surface electrochemistry effect of emulsion, oil droplet is dispersed into is bordering on the too little particle of colloidal particle, have negative charge, so exist with a kind of metastable running balance system.
Summary of the invention:
Technical problem to be solved by this invention provides the method for contained oil in water emulsion in a kind of degreasing wasting liquid that can effectively remove coating wastewater.
Degreasing wasting liquid is removed the method for oil in water emulsion in the coating wastewater of the present invention, may further comprise the steps:
1) with entering the degreasing wasting liquid groove after the degreasing wasting liquid collection, is promoted to reaction tank by the degreasing wasting liquid pump again;
2) in reaction tank, add the dilute sulphuric acid of 18-22% concentration, and mix,, pH value is controlled between 2～3 scopes by detecting pH value control vitriolic dosage with degreasing wasting liquid;
3) enter through the adjusted degreasing wasting liquid of dilute sulphuric acid and leave standstill 2 hours in the oil trap, make the higher fatty acid soap in the oil in water emulsion be converted into water-fast lipid acid and separate and swim on the degreasing wasting liquid;
4) buoyant lipid acid is scraped into the oil-collecting bucket through the oil skimming machine, and the degreasing wasting liquid after handling enters the comprehensive wastewater pond.
Above-mentioned steps 2) dilute sulphuric acid concentration is preferably 20% concentration in.
The present invention handles after separately degreasing wasting liquid being collected, and its employed equipment is simple, less investment, and cost is low, and the oil in water emulsion removal effect is obvious, and clearance can reach 90-95%.
Description of drawings:
Fig. 1 is a schema of the present invention.
Embodiment:
The present invention is described in detail below in conjunction with accompanying drawing.
Embodiment 1:
The present invention does the test of maintaining secrecy in rich love (Guangzhou) automobile component company limited, the said firm is mainly to produce automobile component, degreasing wasting liquid in the coating wastewater enters the degreasing wasting liquid groove after collecting, slowly be promoted to reaction tank by the degreasing wasting liquid pump, detect by the PH instrument, in reaction tank, add the dilute sulphuric acid of 18% concentration by volume pump, control vitriolic dosage, PH is controlled between 2～3 scopes, be provided with stirrer in the reaction tank, stirring velocity is 60 rev/mins, and waste water and soup are mixed.
Enter through the adjusted degreasing wasting liquid of dilute sulphuric acid and to leave standstill 2 hours in the oil trap, anion surfactant in the degreasing wasting liquid that adds after the acid is easily decomposed and loss of stability in acidic solution, original oleophylic and hydrophilic balance have been lost, make the higher fatty acid soap in the emulsifying agent be converted into water-fast lipid acid and separate level comprehensive wastewater pond after the bottom water outlet enters after the pooling.
The lipid acid that swims on the degreasing wasting liquid is scraped into the oil-collecting bucket through the oil skimming machine.Oil skimming machine rubber belt material has hydrophobic oleophilic properties, when adhesive tape turns round in oily(waste)water, takes oil slick out of the water surface in inside and outside scraper plate is scraped the oil-collecting bucket.Present embodiment oil in water emulsion clearance can reach 90-95%.
Embodiment 2:
The present invention in Dalian wide machine metallic substance company limited do the test of maintaining secrecy, the said firm is mainly to produce the hydraulic pressure components and parts, after collecting, enter the degreasing wasting liquid groove in the waste water of workshop, be promoted to reaction tank, detect by the PH instrument by the degreasing wasting liquid pump, in reaction tank, add the dilute sulphuric acid of 22% concentration by volume pump, control vitriolic dosage is controlled between 2～3 scopes PH, is provided with stirrer in the reaction tank, stirring velocity is 40 rev/mins, and waste water and soup are mixed.
Enter through the adjusted degreasing wasting liquid of dilute sulphuric acid and to leave standstill 2 hours in the oil trap, anion surfactant in the degreasing wasting liquid that adds after the acid is easily decomposed and loss of stability in acidic solution, original oleophylic and hydrophilic balance have been lost, make the higher fatty acid soap in the emulsifying agent be converted into water-fast lipid acid and separate level comprehensive wastewater pond after the bottom water outlet enters after the pooling.
The lipid acid that swims on the degreasing wasting liquid is scraped into the oil-collecting bucket through the oil skimming machine.Oil skimming machine rubber belt material has hydrophobic oleophilic properties, when adhesive tape turns round in oily(waste)water, takes oil slick out of the water surface in inside and outside scraper plate is scraped the oil-collecting bucket.Present embodiment oil in water emulsion clearance can reach 90-95%.
Claims (2)
1, the method for degreasing wasting liquid removal oil in water emulsion in a kind of coating wastewater is characterized in that may further comprise the steps:
1) with entering the degreasing wasting liquid groove after the degreasing wasting liquid collection, is promoted to reaction tank by the degreasing wasting liquid pump again;
2) in reaction tank, add the dilute sulphuric acid of 18-22% concentration, and mix,, pH value is controlled between 2～3 scopes by detecting pH value control vitriolic dosage with degreasing wasting liquid;
3) enter through the adjusted degreasing wasting liquid of dilute sulphuric acid and leave standstill 2 hours in the oil trap, make the higher fatty acid soap in the oil in water emulsion be converted into water-fast lipid acid and separate and swim on the degreasing wasting liquid;
4) buoyant lipid acid is scraped into the oil-collecting bucket through the oil skimming machine, and the degreasing wasting liquid after handling enters the comprehensive wastewater pond.
2, degreasing wasting liquid is removed the method for oil in water emulsion in the coating wastewater according to claim 1, it is characterized in that step 2) in dilute sulphuric acid concentration be 20% concentration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102436147A CN101428877A (en) | 2008-12-10 | 2008-12-10 | Method for removing roily oil from degreasing waste liquor in coating wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102436147A CN101428877A (en) | 2008-12-10 | 2008-12-10 | Method for removing roily oil from degreasing waste liquor in coating wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101428877A true CN101428877A (en) | 2009-05-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008102436147A Pending CN101428877A (en) | 2008-12-10 | 2008-12-10 | Method for removing roily oil from degreasing waste liquor in coating wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101428877A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101857340A (en) * | 2010-06-03 | 2010-10-13 | 江西昌河汽车有限责任公司 | Painting wastewater treatment process |
| CN103387295A (en) * | 2012-05-07 | 2013-11-13 | 天津市滨海新区津平制桶厂 | Method for removing emulsified oil in degreasing waste liquid |
| CN105967388A (en) * | 2016-05-27 | 2016-09-28 | 山东大学 | Method for removing emulsified oil in oil field oily wastewater |
| CN108128936A (en) * | 2018-02-01 | 2018-06-08 | 江苏华达环境工程有限公司 | Application degreasing wasting liquid processing unit |
-
2008
- 2008-12-10 CN CNA2008102436147A patent/CN101428877A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101857340A (en) * | 2010-06-03 | 2010-10-13 | 江西昌河汽车有限责任公司 | Painting wastewater treatment process |
| CN101857340B (en) * | 2010-06-03 | 2011-07-27 | 江西昌河汽车有限责任公司 | Painting wastewater treatment process |
| CN103387295A (en) * | 2012-05-07 | 2013-11-13 | 天津市滨海新区津平制桶厂 | Method for removing emulsified oil in degreasing waste liquid |
| CN105967388A (en) * | 2016-05-27 | 2016-09-28 | 山东大学 | Method for removing emulsified oil in oil field oily wastewater |
| CN108128936A (en) * | 2018-02-01 | 2018-06-08 | 江苏华达环境工程有限公司 | Application degreasing wasting liquid processing unit |
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| ASS | Succession or assignment of patent right |
Owner name: HU NAN QIU ZEYOU PATENT STRATEGIC PLANNING CO., LT Free format text: FORMER OWNER: QIU ZEYOU Effective date: 20101027 |
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| C41 | Transfer of patent application or patent right or utility model | ||
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Free format text: CORRECT: ADDRESS; FROM: 410011 28/F, SHUNTIANCHENG, NO.59, SECTION 2 OF FURONG MIDDLE ROAD, CHANGSHA CITY, HU NAN PROVINCE TO: 410205 JUXING INDUSTRY BASE, NO.8, LUJING ROAD, CHANGSHA HIGH-TECH. DEVELOPMENT ZONE, YUELU DISTRICT, CHANGSHA CITY, HU NAN PROVINCE |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20101108 Address after: 214214 Jiangsu city of Yixing province Gaocheng town Xincheng South Road No. 88 Applicant after: Jiangsu Xingchi Environment Protection Co., Ltd. Address before: 214214 Jiangsu city of Yixing province Gaocheng town Xincheng South Road No. 88 Applicant before: Zhou Caihua |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090513 |