CN109928468A - A kind of DC electric field acts on the breaking method of lower oil-in-water emulsion - Google Patents
A kind of DC electric field acts on the breaking method of lower oil-in-water emulsion Download PDFInfo
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- CN109928468A CN109928468A CN201711365794.1A CN201711365794A CN109928468A CN 109928468 A CN109928468 A CN 109928468A CN 201711365794 A CN201711365794 A CN 201711365794A CN 109928468 A CN109928468 A CN 109928468A
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Abstract
The invention discloses the breaking methods that a kind of DC electric field acts on lower oil-in-water emulsion, the present invention is successively parallel staggered in the cabinet of oil water separator with plate by cathode plate, the channel formed between pole plate accelerates the flow velocity of emulsion, to make the oil droplet movement speed in emulsion accelerate, the collision coalescence probability between oil droplet is increased；Since oil droplets are charged, the introducing of DC electric field can significantly accelerate the movement speed of oil droplet, provide more kinetic energy to oil droplet, oil droplet is made to be easier to overcome repulsion and interfacial film and coalesce；After emulsion is by cathode plate and plate, so that the reynolds number Re of fluid flowing increases, apply DC electric field between pole plate simultaneously, under the coupling in electric field and flow field, collision and coalescence probability between oil droplet increase, make oil droplet be easier to coalesce, while improving the coalescence rate between oil droplet, makes water-oil phase quick separating.
Description
Technical field
The invention belongs to heterogeneous separation field, water-oil phase isolation technics is acted on more particularly to a kind of DC electric field
The breaking method of lower oil-in-water emulsion.
Background technique
The industries such as oil exploitation and refining, coal chemical industry, machining, Cosmetic Manufacture and food processing are in process of production
Can generate largely in the form of oil-in-water emulsion existing for oily waste water.The physico-chemical property of oil-in-water emulsion is more multiple
It is miscellaneous, therefore processing difficulty is larger.But if not handling it, it can not only cause serious environmental pollution, also will cause stone
The oily wasting of resources.
Currently, the technology for water-oil separating mainly has: chemical treatment, gravitational settling, centrifuge separation, UF membrane and biology
Method etc..The advantages of chemical treatment, is that medicament kind is more, easy to operate, but is easy to introduce new impurity while demulsification and causes two
Secondary pollution；Gravitational settling low efficiency, effect are poor, not can be removed oil emulsion and dissolved oil, and take up a large area, are only applicable to primary
Water-oil separating；Centrifuging treatment effect is good, high-efficient, but treating capacity is small, and device structure is complicated, and separation costs are high；UF membrane
Method has device and easy to operate, and occupied area is small, stable effluent quality, does not need the advantages such as addition chemical agent, but film is easy
In contamination and plugging, service life is short, and especially in the high oil of removal viscosity, there are no good membrane separation assemblies；It is raw
The characteristics of object method be it is environmentally protective, shortcoming is that strain is unstable, higher to environmental requirement, is taken up a large area, cost is opposite
It is higher.
Due to the oil droplet in water can be spontaneous absorption water in hydroxyl and other negatively charged ions or group, make oil droplets
It is negatively charged, diffusion electric double layer is formed in oil-water interfaces, which makes mutually exclusive between oil droplet, hinders the coalescence of oil droplet.If water
In there are surfactant, surfactant can reduce the interfacial tension of oil droplets, also can to the coalescence of oil droplet generate obstruction
Effect.Therefore, in order to enable oil droplet to coalesce, it is necessary to give oil droplet certain kinetic energy, the repulsion for making it that electric double layer be overcome to be formed
The interfacial film strength formed with surfactant, to realize coalescence.
Summary of the invention
For the deficiencies in the prior art, the purpose of the present invention is to provide a kind of DC electric fields to act on lower oil-in-water
The breaking method of type emulsion utilizes the coupling in the flow field that DC electric field and electrode plate (including cathode plate and plate) generate
Field is closed, so that the tiny oil droplets in water is fast moved coalescence, to realized at normal temperature to oil-in-water emulsion and oily waste water
Demulsification and grease split-phase.
The present invention is achieved by the following technical solutions:
A kind of DC electric field acts on the breaking method of lower oil-in-water emulsion, and cathode plate and plate are successively put down
Row is alternately and staggered in the cabinet of oil water separator, keeps cathode plate and plate positive and negative with power supply respectively
Pole is connected to form DC electric field, fills oil-in-water emulsion in cabinet；
Continuous processing: emulsion is extracted out by water outlet, is reentered in oil water separator realize by water inlet afterwards
Circulation, after powering on, demulsification starts, when there is oil reservoir in emulsion upper layer, adjust water outlet flow, make demulsification after oil from
Oil outlet discharge, to realize water-oil separating；
Batch process: water inlet, water outlet and oil outlet are closed before being powered, after powering on, demulsification starts, on emulsion
Layer has oil reservoir appearance, opens top oil outlet valve, and oil slick is discharged, and then opens water outlet, is discharged subnatant (water).
In the above-mentioned technical solutions, the cathode plate material is pure titanium, and plate material is plating metal on surface iridium
Titanium plate, iridium thickness of coating be 0.2-2 μm.
In the above-mentioned technical solutions, the cathode plate and plate are arranged in pairs.
In the above-mentioned technical solutions, the surface patterns of the cathode plate and plate are as follows: smooth flat plate, just
String corrugated surface plate, trapezoidal corrugated surface plate or triangle corrugated surface plate.
In the above-mentioned technical solutions, in arrangement, plate is placed in fluid for the cathode plate and plate
The big side of flow velocity.
In the above-mentioned technical solutions, the cathode plate is identical with plate shape, equal length；Cathode plate and
The ratio between spacing between the height of plate and adjacent two pieces of pole plates is 0.2-1, the length of cathode plate and plate with
The ratio between width of cabinet is 0.6-0.9, and the ratio between cathode plate and the height and length of plate are 0.2-1.
In the above-mentioned technical solutions, the size of the DC voltage V applied when practical application is the critical electricity that electrolysis water occurs
0.1-0.9 times for pressing Vc.
In the above-mentioned technical solutions, the oil-in-water emulsion is various oily substances and organic solvent dispersion in water
The oil-in-water emulsion or oily waste water formed in phase.
In the above-mentioned technical solutions, the cabinet of the oil water separator is the rectangular parallelepiped structure of upper end opening, inside
It is vertically arranged with cathode plate and plate, water inlet, water outlet and oil outlet are offered on outer wall.
In the above-mentioned technical solutions, it is detachably connected between the cathode plate and plate and cabinet wall.
Compared with prior art, the invention has the advantages and beneficial effects that:
1, method processing oil-in-water emulsion of the invention both can with static treatment can also dynamic continuous processing, water outlet is not
It needs to stand, oil content can drop to prescribed concentration or less in electric field action lower clear liquid water outlet after a certain period of time；
2, the method that uses of the present invention is electric field demulsification method, thus will not generate during demulsification other substances and
Pollution etc.；Treatment effect will not be influenced because of viscosity simultaneously for the excessively high oil-in-water emulsion of viscosity, with other methods phase
Than that more will not cause to block because oily viscosity is excessive, there is better applicability to sticky oily waste water is handled；
3, cathode plate is successively parallel staggered in the cabinet of oil water separator with plate, pole plate of the invention
Between the channel that is formed the flow velocity of emulsion is accelerated, so that the oil droplet movement speed in emulsion be made to accelerate, increase oil
Collision coalescence probability between drop；
4, when handling oil-in-water emulsion, DC electric field can be effectively reduced repulsion between oil droplet and promotes oil droplet the present invention
Fast transferring, to make oil droplet effective collision and coalesce；
5, the present invention couples the flow field that low-voltage direct electric field and pole plate are formed, and makes oil droplet be easier to coalesce, improves simultaneously
Coalescence rate between oil droplet.
Detailed description of the invention
Fig. 1 is the main view of oil water separator of the invention；
Fig. 2 is the top view of oil water separator of the invention；
Fig. 3 is the pattern of pole plate (general designation of cathode plate and plate) of the invention are as follows: plate；
Fig. 4 is the pattern of pole plate (general designation of cathode plate and plate) of the invention are as follows: sine wave-shaped sheet；
Fig. 5 is the pattern of pole plate (general designation of cathode plate and plate) of the invention are as follows: triangular wave card；
Fig. 6 is the pattern of pole plate (general designation of cathode plate and plate) of the invention are as follows: trapezoidal corrugated plating.
Wherein: 1, cabinet；2, water inlet；3, cathode plate；4, oil outlet；5, water outlet；6, plate.
Specific embodiment
1 to 6 present invention is further described in detail with specific embodiment with reference to the accompanying drawing.It needs to illustrate
Be: following embodiments be it is illustrative, be not restrictive, cannot be limited the scope of protection of the present invention with following embodiments.
The cathode plate material referred in following embodiments is pure titanium, and plate material is the titanium of plating metal on surface iridium
Plate prevents from occurring to aoxidize and influence normal use in use.
Embodiment 1
A kind of DC electric field acts on the breaking method of lower oil-in-water emulsion, by three pieces of cathode plates 3 and three pieces of anodes
Pole plate 6 is successively in parallel alternately and staggered in the cabinet 1 of oil water separator, which is the cuboid knot of upper end opening
Structure offers water inlet 2, water outlet 5 and oil outlet 4 on outer wall, and cathode plate 3 and 6 both side surface pattern of plate are
Smooth flat, the spacing between adjacent two pieces of pole plates (general designation of cathode plate 3 and plate 6) are 25mm, a height of 50mm of plate,
Pole plate no power injects 2L oil-in-water emulsion (Mobil hydraulic oil DTE-24) in cabinet 1, and oil content 0.45%vol will be newborn
Shape liquid is extracted out by water outlet 5, is reentered by water inlet 2 realize circulation in oil water separator afterwards, when emulsion upper layer
When core intersection reaches 5mm or more, flow is adjusted, the oil after making demulsification is discharged from oil outlet 4, to realize water-oil separating；?
Flow is continuous processing 150min under conditions of 110ml/min, finally, measuring its demulsification efficiency is 36.77%.
Embodiment 2
A kind of DC electric field acts on the breaking method of lower oil-in-water emulsion, by three pieces of cathode plates 3 and three pieces of anodes
Pole plate 6 is successively in parallel alternately and staggered in the cabinet 1 of oil water separator, which is the cuboid knot of upper end opening
Structure offers water inlet 2, water outlet 5 and oil outlet 4 on outer wall, make cathode plate 3 and anode pole 6 respectively with the anode of power supply
DC electric field is connected to form with cathode, and application voltage is 20V, between every piece of pole plate (general designation of cathode plate and plate)
Spacing is 25mm, and a height of 50mm of plate, cathode plate 3 and plate 6 are plate, injects 2L oil-in-water type emulsus in cabinet 1
Emulsion is extracted out by water outlet 5, passes through 2 weight of water inlet afterwards by liquid (Mobil hydraulic oil DTE-24), oil content 0.45%vol
Newly enter and realize circulation in oil water separator, after powering on, demulsification starts, when the core intersection on emulsion upper layer reaches 5mm
When above, flow is adjusted, the oil after making demulsification is discharged from oil outlet 4, to realize water-oil separating；It is 110ml/min in flow
Under conditions of continuous processing 150min, finally, measure its demulsification efficiency be 98.0%.
Embodiment 3
A kind of DC electric field acts on the breaking method of lower oil-in-water emulsion, by three pieces of cathode plates 3 and three pieces of anodes
Pole plate 6 is successively in parallel alternately and staggered in the cabinet 1 of oil water separator, which is the cuboid knot of upper end opening
Structure offers water inlet 2, water outlet 5 and oil outlet 4 on outer wall, make cathode plate 3 and plate 6 respectively with power supply just
Pole and cathode are connected to form DC electric field, and application voltage is 20V, every piece of pole plate (general designation of cathode plate 3 and plate 6) it
Between spacing be 50mm, a height of 50mm of plate, cathode plate 3 and plate 6 are sine wave-shaped sheet, inject 2L water in cabinet 1
Oil-in-water emulsions (Mobil hydraulic oil DTE-24), oil content 0.45%vol extract emulsion by water outlet 5 out, after pass through
Water inlet 2, which reenters, realizes circulation in oil water separator, after powering on, demulsification starts, when the oil reservoir on emulsion upper layer is thick
When degree reaches 5mm or more, flow is adjusted, the oil after making demulsification is discharged from oil outlet 4, to realize water-oil separating；It is in flow
Continuous processing 150min under conditions of 110ml/min, finally, measuring its demulsification efficiency is 96.5%.
Embodiment 4
A kind of DC electric field acts on the breaking method of lower oil-in-water emulsion, by three pieces of cathode plates 3 and three pieces of anodes
Pole plate 6 is successively in parallel alternately and staggered in the cabinet 1 of oil water separator, which is the cuboid knot of upper end opening
Structure offers water inlet 2, water outlet 5 and oil outlet 4 on outer wall, make cathode plate 3 and anode pole 6 respectively with the anode of power supply
DC electric field is connected to form with cathode, and application voltage is 20V, between every piece of pole plate (general designation of cathode plate and plate)
Spacing is 50mm, and a height of 50mm of plate, cathode plate 3 and plate 6 are sine wave-shaped sheet, injects 2L oil-in-water in cabinet 1
Emulsion is extracted out by water outlet 5, passes through water inlet 2 afterwards by type emulsion (diesel oil is commercially available 0#), oil content 0.45%vol
It reenters and realizes circulation in oil water separator, after powering on, demulsification starts, when the core intersection on emulsion upper layer reaches
When 5mm or more, flow is adjusted, the oil after making demulsification is discharged from oil outlet 4, to realize water-oil separating；It is 110ml/ in flow
Continuous processing 150min under conditions of min, finally, measuring its demulsification efficiency is 96.8%.
Embodiment 5
A kind of DC electric field acts on the breaking method of lower oil-in-water emulsion, by three pieces of cathode plates 3 and three pieces of anodes
Pole plate 6 is successively in parallel alternately and staggered in the cabinet 1 of oil water separator, which is the cuboid knot of upper end opening
Structure offers water inlet 2, water outlet 5 and oil outlet 4 on outer wall, make cathode plate 3 and anode pole 6 respectively with the anode of power supply
DC electric field is connected to form with cathode, and application voltage is 20V, between every piece of pole plate (general designation of cathode plate 3 and plate 6)
Spacing be 50mm, cathode plate 3 and plate 6 are triangular wave card, injection 500ml oil-in-water type cream in cabinet 1
Shape liquid (Mobil hydraulic oil DTE-24), oil content 0.5%vol, liquid level 100mm, the critical voltage that electrolysis water occurs are
40V closes water outlet 5 and oil outlet 4 before being powered, and after powering on, demulsification starts, and there is oil reservoir appearance on emulsion upper layer, works as cream
It when the core intersection on shape liquid upper layer reaches 5mm or more, opens top oil outlet 4 and switchs, the oil after discharge demulsification is then opened out
Lower water is discharged in the mouth of a river 5, continuous processing 150min under conditions of flow is 110ml/min, finally, measuring its demulsification efficiency and being
97.9%.
Embodiment 6
A kind of DC electric field acts on the breaking method of lower oil-in-water emulsion, by three pieces of cathode plates 3 and three pieces of anodes
Pole plate 6 is successively in parallel alternately and staggered in the cabinet 1 of oil water separator, which is the cuboid knot of upper end opening
Structure offers water inlet 2, water outlet 5 and oil outlet 4 on outer wall, make cathode plate 3 and anode pole 6 respectively with the anode of power supply
DC electric field is connected to form with cathode, and application voltage is 20V, between every piece of pole plate (general designation of cathode plate and plate)
Spacing is 50mm, and cathode plate 3 and plate 6 are trapezoidal corrugated plating, injects 500ml oil-in-water emulsion in cabinet 1
Electrolysis water occurs for (Mobil hydraulic oil DTE-24), oil content 0.5%vol, salt content 0.2mmol/L, liquid level 100mm
Critical voltage be 30V, close water outlet 5 and oil outlet 4 before being powered, after powering on, demulsification starts, and there is oil on emulsion upper layer
Layer occurs, and when the core intersection on emulsion upper layer reaches 5mm or more, opens top oil outlet 4 and switchs, after discharge demulsification
Oil then opens water outlet 5, and lower water is discharged, continuous processing 150min under conditions of flow is 110ml/min, finally, surveying
Obtaining its demulsification efficiency is 97.7%.
The present invention is successively parallel staggered in the cabinet 1 of oil water separator with plate 6 by cathode plate 3, pole
The channel formed between plate accelerates the flow velocity of emulsion, so that the oil droplet movement speed in emulsion be made to accelerate, increases
Collision coalescence probability between oil droplet；Since oil droplets are charged, the introducing of DC electric field can significantly accelerate the mobile speed of oil droplet
Degree provides more kinetic energy to oil droplet, oil droplet is made to be easier to overcome repulsion and interfacial film and coalesce；Pass through cathode plate in emulsion
3 and plate 6 after so that the reynolds number Re of fluid flowing increases, while applying DC electric field between pole plate, in electric field and stream
Coupling under, collision between oil droplet and coalescence probability increase, and make oil droplet be easier to coalesce, while improving poly- between oil droplet
Knot rate makes water-oil phase quick separating.
The demulsification to oil-in-water emulsion can be achieved according to the adjustment that summary of the invention carries out technological parameter, and show
The almost the same performance with above-described embodiment.Illustrative description is done to the present invention above, it should which explanation is not departing from
In the case where core of the invention, any simple deformation, modification or other skilled in the art can not spend creation
Property labour equivalent replacement each fall within protection scope of the present invention.
Claims (10)
1. the breaking method that a kind of DC electric field acts on lower oil-in-water emulsion, it is characterised in that: by cathode plate and anode
Pole plate successively in parallel alternately and it is staggered in the cabinet of oil water separator, make cathode plate and plate respectively with power supply
Anode and cathode be connected to form DC electric field, fill oil-in-water emulsion in cabinet；
Continuous processing: emulsion is extracted out by water outlet, and rear reentered by water inlet realizes circulation in oil water separator,
After powering on, demulsification starts, and when oil reservoir occurs in emulsion upper layer, adjusts water outlet flow, oily from fuel-displaced after making demulsification
Mouth discharge, to realize water-oil separating；
Batch process: water inlet, water outlet and oil outlet are closed before being powered, after powering on, demulsification starts, and emulsion upper layer has
Oil reservoir occurs, and opens top oil outlet valve, and oil slick is discharged, and then opens water outlet, and subnatant is discharged.
2. a kind of DC electric field according to claim 1 acts on the breaking method of lower oil-in-water emulsion, feature exists
In: the cathode plate material is pure titanium, and plate material is the titanium plate of plating metal on surface iridium.
3. a kind of DC electric field according to claim 1 acts on the breaking method of lower oil-in-water emulsion, feature exists
In: the cathode plate and plate is arranged in pairs.
4. a kind of DC electric field according to claim 1 acts on the breaking method of lower oil-in-water emulsion, feature exists
In: the surface patterns of the cathode plate and plate are as follows: smooth flat plate, sine bellows shape surface plate, trapezoidal wave
Line shape surface plate or triangle corrugated surface plate.
5. a kind of DC electric field according to claim 1 acts on the breaking method of lower oil-in-water emulsion, feature exists
In: for the cathode plate and plate in arrangement, plate is placed in the big side of fluid flow rate.
6. a kind of DC electric field according to claim 1 acts on the breaking method of lower oil-in-water emulsion, feature exists
In: the ratio between spacing between the height and adjacent two pieces of pole plates of the cathode plate and plate is 0.2-1, cathode plate
It is 0.6-0.9, the ratio between cathode plate and the height and length of plate with the ratio between the width of the length of plate and cabinet
For 0.2-1.
7. a kind of DC electric field according to claim 1 acts on the breaking method of lower oil-in-water emulsion, feature exists
In: the size of the DC voltage V applied when practical application is 0.1-0.9 times of the critical voltage Vc of generation electrolysis water.
8. a kind of DC electric field according to claim 1 acts on the breaking method of lower oil-in-water emulsion, feature exists
In: the oil-in-water emulsion is the oil-in-water emulsion that various oily substances and organic solvent dispersion are formed in water phase
Or oily waste water.
9. a kind of DC electric field according to claim 1 acts on the breaking method of lower oil-in-water emulsion, feature exists
In: the cabinet of the oil water separator is the rectangular parallelepiped structure of upper end opening, and inner vertical is provided with cathode plate and sun
Pole pole plate offers water inlet, water outlet and oil outlet on outer wall.
10. a kind of DC electric field according to claim 1 acts on the breaking method of lower oil-in-water emulsion, feature exists
In: it is detachably connected between the cathode plate and plate and cabinet wall.
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Cited By (4)
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| CN111252871A (en) * | 2020-02-28 | 2020-06-09 | 广东工业大学 | Device for removing colloid impurities under action of static field force coupled with multistage partition plates and water power |
| CN112499858A (en) * | 2020-12-01 | 2021-03-16 | 华东理工大学 | Demulsification device and method for coalescence of coupling medium of non-uniform electric field |
| CN113233543A (en) * | 2021-05-26 | 2021-08-10 | 大连海事大学 | Micro-scale oil drop separation device and method for oily sewage of ship |
| CN114524492A (en) * | 2022-02-25 | 2022-05-24 | 清华大学 | Oil-water separation device |
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Application publication date: 20190625 |