CN109368741B - Heavy oil, light oil and water three-component separation device and separation method thereof - Google Patents
Heavy oil, light oil and water three-component separation device and separation method thereof Download PDFInfo
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- CN109368741B CN109368741B CN201811386079.0A CN201811386079A CN109368741B CN 109368741 B CN109368741 B CN 109368741B CN 201811386079 A CN201811386079 A CN 201811386079A CN 109368741 B CN109368741 B CN 109368741B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/08—Thickening liquid suspensions by filtration
- B01D17/10—Thickening liquid suspensions by filtration with stationary filtering elements
Abstract
The invention discloses a separation device and a separation method for three components of heavy oil, light oil and water, comprising a separation container, wherein an ultra-oleophylic-ultra-hydrophobic filter screen is arranged in the separation container, the bottom of the separation container is provided with a heavy oil discharge pipe for discharging the heavy oil filtered by the ultra-oleophylic-ultra-hydrophobic filter screen in the separation container, the periphery of the ultra-oleophylic-ultra-hydrophobic filter screen is surrounded with a light oil discharge device for receiving the light oil leaked from the upper part of the ultra-oleophylic-ultra-hydrophobic filter screen, an injection pipe for introducing oil-water mixed liquid is arranged above the ultra-oleophylic-ultra-hydrophobic filter screen, the upper part of the ultra-oleophylic-ultra-hydrophobic filter screen is provided with an accumulated liquid discharge device which extends into the middle part of the ultra-oleophylic-ultra-hydrophobic filter screen and pumps the filtered accumulated liquid, the device can realize the sustainable separation of the three components of the heavy oil, the light oil and the water based on a single ultra-oleophylic-ultra-hydrophobic metal screen, meanwhile, the device is also suitable for filtering and separating the fluid oil-water mixed liquid, and has easy operability and easy implementation.
Description
Technical Field
The invention relates to a device and a method for separating three components of heavy oil, light oil and water.
Background
With the development of industry and the increase of population, the environmental pollution is increasingly serious; among them, the continuous discharge of industrial and domestic oily wastewater and the frequent oil spill accidents cause serious damages to water supply resources and ecological environment. Therefore, how to realize effective oil-water separation is highly regarded by academic and industrial fields.
Although the traditional oil-water separation technology such as gravity settling method, centrifugal method, adsorption method and the like can achieve the purpose of oil-water separation to a certain extent, the problems of low separation efficiency, insufficient separation purity and the like generally exist. Due to the special oil and water wettability, the super-wetting material has been widely researched in the field of oil-water separation. To date, a great deal of super-oleophilic-super-hydrophobic materials have been prepared, but very few super-hydrophilic-super-oleophobic materials have been reported, so that the existing research mainly focuses on the oil-water separation of the super-oleophilic-super-hydrophobic materials. The document W, Yang, et al, Superhydrophic coppercoating, switched vegetable oil, on-demand oil-water separation, and anti-pollution [ J ] Chemical Engineering Journal, 2017, 327: 849-854 reports a small-sized filtering device based on an ultra-oleophilic-ultra-hydrophobic copper mesh interlayer, i.e., an ultra-wetting copper mesh is tightly sandwiched between two glass tubes, and the density difference of oil and water is utilized to realize a better separation effect of a heavy oil/water mixed liquid. However, this device is difficult to use for separation of light oil/water mixed liquor; in addition, the separation capability of the structure is limited, and the structure can only separate oil-water mixture of dozens to hundreds of milliliters generally. The documents W.T. Cao, et al, facility prediction of robust and super-hydrophilic materials for self-cleaning and oil/water separation [ J ]. Colloids and Surfaces A: physical and Engineering applications, 2017, 529: 18-25, use of a "two-channel" structure, i.e., a through opening is bored at the lower position of the side wall of the upper glass tube of the above-mentioned sandwich filter device, to achieve a sustainable separation of oil and water flowing out from different channels. However, the structure has the problems of high operation difficulty, poor separation purity and the like. Sustainable oil-water separation based on resistant wetting membranes (super oleophilic-super hydrophobic and super hydrophilic-super oleophobic membranes) is reported in the document J.Li, et al. The device can realize the sustainable separation of the mixed liquid of light oil or heavy oil and water, but as mentioned above, the preparation of the super-hydrophilic-super-oleophobic membrane still has great difficulty at present, so that the device cannot be popularized and applied well. In addition, this structure cannot separate three components of heavy oil, light oil, and water at the same time.
Disclosure of Invention
The invention improves the problems, namely the technical problems to be solved by the invention are that although the traditional oil-water separation technology such as gravity settling method, centrifugal method, adsorption method and the like can achieve the purpose of oil-water separation to a certain extent, the traditional oil-water separation technology generally has the problems of low separation efficiency, insufficient separation purity and the like, and cannot treat the rapid separation of three components of heavy oil, light oil and water.
The specific embodiment of the invention is as follows: the utility model provides a three kinds of composition separator of heavy oil, light oil, water, includes a separation container who is used for bearing the weight of the separator, the separation container internal fixation has the super oleophilic-super hydrophobic filter screen that is used for separating the separation container inner chamber and forms two separation areas, the separation container bottom has the heavy oil discharge pipe that will separate the heavy oil discharge that the container internal warp oil-super hydrophobic filter screen filtered out, super oleophilic-super hydrophobic filter screen peripheral around have accept by super oleophilic-super hydrophobic filter screen upper portion seepage light oil eduction gear, super oleophilic-super hydrophobic filter screen top has the filling tube that lets in oil-water mixture, super oleophilic-super hydrophobic filter screen upper portion has the accumulated liquid eduction gear that will filter back hydrops and take off that stretches into super oleophilic-super hydrophobic filter screen middle part.
In a preferred embodiment: the feeding end of the injection pipe of the mixed liquid injection device is inserted into the bottom of the mixed liquid, so that three components of heavy oil, water and light oil are ensured to be sequentially sucked.
In a preferred embodiment: the light oil discharge device comprises an annular collecting pipe, the upper surface of the annular collecting pipe is provided with a notch for light oil to enter, the outer side of the annular collecting pipe is provided with an oil discharge port, and the inner side of the annular collecting pipe is attached to the outer wall of the super-oleophilic-super-hydrophobic filter screen;
the accumulated liquid discharging means includes an extraction pipe communicating with a lower portion of the separation vessel, and the extraction pipe has an extraction pump thereon.
In a preferred embodiment: the super oleophylic-super hydrophobic filter screen is internally provided with a liquid level sensor for sensing the height of accumulated liquid, the liquid level sensor comprises an upper liquid level sensor and a lower liquid level sensor, the lower end of the liquid suction pipe is positioned below the lower liquid level sensor, and the lower liquid level sensor is higher than the upper surface of the annular collecting pipe.
In a preferred embodiment: the super oleophylic-super hydrophobic filter screen is characterized in that a longitudinally arranged partition plate is arranged in the center of the super oleophylic-super hydrophobic filter screen, scales are marked on the partition plate, and a gap is reserved between the bottom of the partition plate and the super oleophylic-super hydrophobic filter screen.
In a preferred embodiment: the super oleophylic-super hydrophobic filter screen is a metal mesh with a super oleophylic-super hydrophobic coating on the surface, the super oleophylic-super hydrophobic coating is obtained by spraying or dip-coating super wetting materials on the surface of the metal mesh, and the metal mesh is made of stainless steel or copper.
In a preferred embodiment: the separation container is columnar, the super oleophilic-super-hydrophobic filter screen is in an inverted cone shape, and the super oleophilic-super-hydrophobic filter screen is supported on the upper part of an inner cavity of the separation container through a fixed support.
In a preferred embodiment: the liquid outlet port of the oil-water mixed liquid injection pipe faces the lower part of the left side of the partition plate, so that the impact force of the mixed liquid on the metal mesh is reduced, and the service life of the filter screen is prolonged.
In a preferred embodiment: the fixed support is an annular support which is fixedly connected with the upper edge of the super oleophylic-super hydrophobic filter screen, and the annular support is fixed on the upper edge of the separation container.
The invention also comprises a method for separating three components of heavy oil, light oil and water, which is characterized in that: the device for separating the three components of the heavy oil, the light oil and the water comprises the following specific steps:
(1) arranging the super oleophilic-super hydrophobic filter screen in a separation container through a fixed support, and arranging a partition plate in the super oleophilic-super hydrophobic filter screen;
(2) introducing a mixed liquid into the super oleophilic-super-hydrophobic filter screen through an injection pipe, wherein heavy oil is firstly sucked into the bottom of the mixed liquid at the feeding end of the injection pipe and enters a lower separation container through the super oleophilic-super-hydrophobic filter screen, and the entering height of the heavy oil must be lower than the height of the upper edge of an annular collecting pipe in the oil discharging device;
(3) after the heavy oil in the mixed liquid is injected, water of the mixed liquid is continuously sucked into the super oleophilic-super hydrophobic filter screen, water is pumped by the liquid pump and liquid level control is carried out according to the liquid level sensor, the water level is ensured to be above the annular collecting pipe, so that light oil permeates into the annular collecting pipe from the filter screen and is discharged from the oil discharge port, and finally, water accumulated in the super oleophilic-super hydrophobic filter screen is sucked and discharged by the liquid suction pipe;
(4) when light oil and water exist above the super-oleophylic-super-hydrophobic filter screen at the same time, the remaining water is sucked by the liquid suction pipe, and the liquid level of the liquid suction pipe is higher than that of the annular collecting pipe;
(5) the heavy oil in the separation vessel is discharged through a heavy oil discharge pipe.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides an oil-water filtering device capable of simultaneously separating heavy oil, light oil and water, which adjusts a traditional plane super oleophilic-super hydrophobic metal net into a three-dimensional filtering net structure (container structure), improves the contact area of the oil, the water and the metal net in mixed liquid, and can simultaneously realize the sustainable separation of three components of the heavy oil, the light oil and the water by introducing the light oil into an annular collecting pipe with an opening on the upper surface and controlling the liquid level height of accumulated water.
2. The invention provides an oil-water filtering device capable of simultaneously separating heavy oil, light oil and water, which can simultaneously realize the sustainable separation of the heavy oil, the light oil and the water based on a single super oleophilic-super hydrophobic metal net and is also suitable for filtering and separating a flowing oil-water mixed solution, thereby having very important significance for the super oleophilic-super hydrophobic material which can be widely prepared at the present stage.
Drawings
FIG. 1 is a schematic view of an efficient continuous separation apparatus for three components of heavy oil, light oil and water according to example 1 of the present invention;
FIG. 2 is a front sectional view of the filtration side of the apparatus for efficiently and continuously separating three components of heavy oil, light oil and water according to example 1 of the present invention;
FIG. 3 is a sectional view of the filtration side of the apparatus for efficiently and continuously separating three components of heavy oil, light oil and water according to example 1 of the present invention;
FIG. 4 is a plan view of the filtration side of the apparatus for efficiently and continuously separating three components of heavy oil, light oil and water according to example 1 of the present invention.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
Example 1 referring to fig. 1 to 4, an oil-water filtration apparatus capable of simultaneously separating heavy oil, light oil, and water includes an oil-water mixture injection device 1, an ultra-oleophilic and ultra-hydrophobic filter screen 2, a liquid level sensing device 3, filtered oil discharge devices 5 and 6, and an accumulated water discharge device 4. The injection device comprises an injection pipe (an injection pipe feeding end 11 and an injection pipe discharging end 13) and a liquid pump 12, and continuous injection of oil-water mixed liquid is realized;
the filter screen comprises an ultra-oleophylic-ultra-hydrophobic filter screen 22 and a detachable fixing support 21 thereof;
in this embodiment, the super oleophilic-super hydrophobic filter screen is an inverted cone, the super oleophilic-super hydrophobic filter screen is supported on the upper part of the inner cavity of the separation container through a fixed support, and the fixed support 21 is annular.
The filtered oil discharging device comprises a light oil discharging device 5 and a heavy oil discharging device 6, wherein the light oil discharging device 5 comprises an annular collecting pipe 51 and an oil discharging pipe 52, and the heavy oil discharging device consists of a separating container 61 and a heavy oil discharging pipe 62 which is communicated with the bottom of the separating container and is used for discharging heavy oil; in this embodiment, the separation container 61 is in a cylindrical shape, and the accumulated water discharge device 4 includes a water suction pipe 42 and a water pump 41; the sensing device 3 comprises a partition 33, an upper liquid level sensor 31 and a lower liquid level sensor 32 of the partition 33, and the upper liquid level sensor 31 and the lower liquid level sensor 32 are used for feeding back the height of the water level in the filter screen, so that the efficient and continuous filtering and separating effect is achieved.
The partition 33 may be provided with scales to facilitate the adjustment of the positions of the upper level sensor 31 and the lower level sensor 32.
In this embodiment, the liquid suction pipe 42 of the accumulated water discharge device 4 is adjacent to the partition.
In this embodiment, and with further reference to FIG. 2, the inlet end 11 of the injection tube of the injection device 1 is inserted into the bottom of the mixed liquor to ensure that the three components of heavy oil, water and light oil are sequentially sucked in.
Generally, the mixed liquid is allowed to stand with heavy oil, water and light oil separated from bottom to top.
In this embodiment, the pipette 11 and the injection pipe 13 are preferably pipes having super-hydrophobic-super-oleophobic properties to avoid impurities in the separation caused by oil-water residue inside.
In this embodiment, the base material of the super-oleophilic-super-hydrophobic filter screen 22 is a metal mesh with excellent performance, and the material of the metal mesh may be, but is not limited to, stainless steel, copper, or other composite metals.
The super oleophilic-super hydrophobic filter screen 22 may be obtained by a dip coating process.
The baffle plate 33 of the induction device 3 is fixedly arranged at the center of the filter screen.
The light oil discharge device 5 is a slotted annular pipe 51 closely attached to the outer wall of the strainer, and a light oil discharge pipe 52 (or an oil discharge port) is chiseled thereon. The notch edge of the upper part of the slotted annular pipe 51 is ensured to be tightly attached to the outer wall of the super oleophilic-super hydrophobic filter screen 22, in order to achieve the purpose, the slotted annular pipe 51 can be also tightly attached to the outer wall of the filter screen after being inclined by a small angle, the oil discharge pipe 52 is positioned on the outer side, and the inclined slotted annular pipe 51 can also facilitate the discharge of light oil from the light oil discharge pipe 52.
In operation, assuming that the mixed solution containing heavy oil-water-light oil is in a standing state in an initial state, the injection pipe 11 of the injection device 1 is inserted into the bottom of the mixed solution, and heavy oil, water and light oil are sequentially pumped out due to the liquid density, and since the super oleophilic-super hydrophobic filter net is used, the heavy oil pumped out first quickly passes through the super oleophilic-super hydrophobic filter net 22 to reach the heavy oil separation vessel 61 and is discharged from the oil discharge pipe 62. It should be noted that the height of the heavy oil in the filter net cannot be higher than the height of the annular collecting pipe 51 in the oil discharging device 5 (the annular collecting pipe 51 is closely connected with the super oleophilic-super hydrophobic filter net 22, and no gap connection can be considered), so as to ensure that the heavy oil does not enter the annular collecting pipe 51 from the upper part of the super oleophilic-super hydrophobic filter net 22.
Typically, the heavy oil permeation rate is extremely fast and not higher than the height of annular collection tube 51. To avoid the heavy oil from penetrating into the annular collecting pipe 51, the annular collecting pipe 51 may be disposed above the middle of the vertical height of the super oleophilic-super hydrophobic filter screen 22.
After the heavy oil is pumped out, water is next, the characteristic of the super oleophilic-super-hydrophobic filter screen 22 is oleophilic and hydrophobic, the water can not pass through the super oleophilic-super-hydrophobic filter screen 22 and is accumulated inside the filter screen, at this time, the water can be pumped out controllably according to the height of the water surface through the water suction pump 41 and the water suction pipe 42, so that the liquid level of the accumulated water is kept between the upper liquid level sensor 31 and the lower liquid level sensor 32, and the water suction pipe must stretch into the lower part of the upper liquid level sensor 31 and can also stretch into the lower part of the liquid level sensor 32, so that the light oil above the water can be prevented from being simultaneously pumped out by the water suction pump when light oil and water simultaneously exist in the super oleophilic-super-hydrophobic filter screen 22.
It should be noted here that the annular collection pipe 51 should be below the lower level sensor 32. In the process of pumping water of the mixed liquid, the water surface height can be always positioned between the two liquid surface inductors through the liquid surface inductors and the water pump. After the water in the mixed liquid is pumped to the liquid level surface of the liquid level sensor 32, the accumulated water level in the super oleophilic-super hydrophobic filter screen 22 is above the annular collecting pipe 51, so that the light oil can permeate from the side wall of the super oleophilic-super hydrophobic filter screen 22 to the annular collecting pipe 51 and then is discharged through the discharge pipe 52, and therefore, the continuous separation of the three components can be realized.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
If the invention discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (10)
1. A device for separating three components of heavy oil, light oil and water is characterized by comprising a separation container for bearing separated objects, an oleophylic-super-hydrophobic filter screen for separating the inner cavity of the separation container into two separation areas is fixed in the separation container, the bottom of the separation container is provided with a heavy oil discharge pipe which discharges the heavy oil filtered by the super oleophilic-super hydrophobic filter screen in the separation container, the periphery of the super oleophilic-super hydrophobic filter screen is surrounded with a light oil discharge device for receiving light oil leaked from the upper part of the super oleophilic-super hydrophobic filter screen, an injection pipe for introducing oil-water mixed liquid is arranged above the super-oleophylic-super-hydrophobic filter screen, and an accumulated liquid discharge device which extends into the middle of the super-oleophylic-super-hydrophobic filter screen and pumps away filtered accumulated liquid is arranged at the upper part of the super-oleophylic-super-hydrophobic filter screen.
2. The apparatus as claimed in claim 1, wherein the inlet end of the injection pipe of the mixed liquid injector is inserted into the bottom of the mixed liquid to sequentially suck the heavy oil, the light oil and the water.
3. The three-component separation device of heavy oil, light oil and water as claimed in claim 1, wherein the light oil discharge device comprises an annular collecting pipe, the upper surface of the annular collecting pipe is provided with a notch for light oil to enter, the outer side of the annular collecting pipe is provided with an oil discharge port, and the inner side of the annular collecting pipe is attached to the outer wall of the super oleophilic-super hydrophobic filter screen;
the accumulated liquid discharging means includes an extraction pipe communicating with a lower portion of the separation vessel, and the extraction pipe has an extraction pump thereon.
4. The device for separating three components of heavy oil, light oil and water according to claim 2, wherein the super oleophilic-super hydrophobic filter screen is provided with a liquid level sensor for sensing the height of accumulated liquid, the liquid level sensor comprises an upper liquid level sensor and a lower liquid level sensor, the lower end of the liquid pumping pipe is positioned below the lower liquid level sensor, and the lower liquid level sensor is higher than the upper surface of the annular collecting pipe.
5. The device for separating three components of heavy oil, light oil and water as claimed in claim 1, 2 or 3, wherein a longitudinally-arranged partition is arranged in the center of the super oleophilic-super-hydrophobic filter screen, scales are marked on the partition, and a gap is reserved between the bottom of the partition and the super oleophilic-super-hydrophobic filter screen.
6. The apparatus of claim 4, wherein the apparatus further comprises: the super oleophylic-super hydrophobic filter screen is a metal mesh with a super oleophylic-super hydrophobic coating on the surface, the super oleophylic-super hydrophobic coating is obtained by spraying or dip-coating super wetting materials on the surface of the metal mesh, and the metal mesh is made of stainless steel or copper.
7. The apparatus for separating three components of heavy oil, light oil and water according to claim 1, wherein: the separation container is columnar, the super oleophilic-super-hydrophobic filter screen is in an inverted cone shape, and the super oleophilic-super-hydrophobic filter screen is supported on the upper part of an inner cavity of the separation container through a fixed support.
8. The apparatus of claim 3, wherein the apparatus further comprises: the liquid outlet port of the oil-water mixed liquid injection pipe faces the lower part of the left side of the partition plate, so that the impact force of the mixed liquid on the metal mesh is reduced, and the service life of the filter screen is prolonged.
9. The apparatus for separating three components of heavy oil, light oil and water according to claim 1, wherein: the fixed support is an annular support which is fixedly connected with the upper edge of the super oleophylic-super hydrophobic filter screen, and the annular support is fixed on the upper edge of the separation container.
10. A method for separating three components of heavy oil, light oil and water is characterized in that: the device for separating three components of heavy oil, light oil and water according to claim 3 or 4 comprises the following steps:
(1) arranging the super oleophilic-super hydrophobic filter screen in a separation container through a fixed support, and arranging a partition plate in the super oleophilic-super hydrophobic filter screen;
(2) introducing a mixed liquid into the super oleophilic-super-hydrophobic filter screen through an injection pipe, wherein heavy oil is firstly sucked into the bottom of the mixed liquid at the feeding end of the injection pipe and enters a lower separation container through the super oleophilic-super-hydrophobic filter screen, and the entering height of the heavy oil must be lower than the height of the upper edge of an annular collecting pipe in the oil discharging device;
(3) after the heavy oil in the mixed liquid is injected, water of the mixed liquid is continuously sucked into the super oleophilic-super hydrophobic filter screen, water is pumped by the liquid pump and liquid level control is carried out according to the liquid level sensor, the water level is ensured to be above the annular collecting pipe, so that light oil permeates into the annular collecting pipe from the filter screen and is discharged from the oil discharge port, and finally, water accumulated in the super oleophilic-super hydrophobic filter screen is sucked and discharged by the liquid suction pipe;
(4) when light oil and water exist above the super-oleophylic-super-hydrophobic filter screen at the same time, the remaining water is sucked by the liquid suction pipe, and the liquid level of the liquid suction pipe is higher than that of the annular collecting pipe;
(5) the heavy oil in the separation vessel is discharged through a heavy oil discharge pipe.
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| CN109879368B (en) * | 2019-03-25 | 2021-10-15 | 四川农业大学 | Oil-water separation device |
| CN112523184A (en) * | 2020-11-24 | 2021-03-19 | 华侨大学 | Automatic oil slick collection device based on super hydrophobic metal mesh |
| CN114671490A (en) * | 2022-03-31 | 2022-06-28 | 华侨大学 | Energy-saving general oil-water separation device |
| CN115487601A (en) * | 2022-08-31 | 2022-12-20 | 恩彻尔(天津)环保科技有限公司 | Solid-liquid waste intelligent materialization system |
| CN115583692A (en) * | 2022-11-11 | 2023-01-10 | 中国电建集团贵阳勘测设计研究院有限公司 | Oil-water separator working by utilizing different specific gravity of oil and water |
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