CN111196620B - Oil-water separation device and method for treating wastewater in metallurgical industrial process - Google Patents
Oil-water separation device and method for treating wastewater in metallurgical industrial process Download PDFInfo
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- CN111196620B CN111196620B CN202010062622.2A CN202010062622A CN111196620B CN 111196620 B CN111196620 B CN 111196620B CN 202010062622 A CN202010062622 A CN 202010062622A CN 111196620 B CN111196620 B CN 111196620B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 238000000926 separation method Methods 0.000 title claims abstract description 68
- 239000002351 wastewater Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims description 12
- 238000004519 manufacturing process Methods 0.000 title abstract description 11
- 239000008213 purified water Substances 0.000 claims abstract description 49
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 239000011159 matrix material Substances 0.000 claims abstract description 17
- PUVAFTRIIUSGLK-UHFFFAOYSA-M trimethyl(oxiran-2-ylmethyl)azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CC1CO1 PUVAFTRIIUSGLK-UHFFFAOYSA-M 0.000 claims abstract description 9
- 239000006260 foam Substances 0.000 claims description 48
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 229920000877 Melamine resin Polymers 0.000 claims description 16
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical group NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 16
- 239000011148 porous material Substances 0.000 claims description 13
- 238000013461 design Methods 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 238000012986 modification Methods 0.000 claims description 8
- 230000004048 modification Effects 0.000 claims description 8
- 238000010992 reflux Methods 0.000 claims description 6
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- 239000000463 material Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 3
- 238000007385 chemical modification Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000009210 therapy by ultrasound Methods 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 26
- 235000019198 oils Nutrition 0.000 description 26
- 239000000839 emulsion Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 239000000243 solution Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000010720 hydraulic oil Substances 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- 239000003094 microcapsule Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 239000002569 water oil cream Substances 0.000 description 3
- NHTMVDHEPJAVLT-UHFFFAOYSA-N Isooctane Chemical compound CC(C)CC(C)(C)C NHTMVDHEPJAVLT-UHFFFAOYSA-N 0.000 description 2
- JVSWJIKNEAIKJW-UHFFFAOYSA-N dimethyl-hexane Natural products CCCCCC(C)C JVSWJIKNEAIKJW-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 150000007974 melamines Chemical class 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 238000001612 separation test Methods 0.000 description 2
- ITYXXSSJBOAGAR-UHFFFAOYSA-N 1-(methylamino)-4-(4-methylanilino)anthracene-9,10-dione Chemical compound C1=2C(=O)C3=CC=CC=C3C(=O)C=2C(NC)=CC=C1NC1=CC=C(C)C=C1 ITYXXSSJBOAGAR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000769 gas chromatography-flame ionisation detection Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007764 o/w emulsion Substances 0.000 description 1
- 235000019476 oil-water mixture Nutrition 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 description 1
- 229920000053 polysorbate 80 Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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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
-
- 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
-
- 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
- B01D17/0208—Separation of non-miscible liquids by sedimentation
-
- 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
- C02F2001/007—Processes including a sedimentation step
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses an oil-water separation device for treating wastewater in a metallurgical industrial process, which comprises a wastewater tank, a separator and a purified water tank, wherein the separator is provided with a liquid inlet and a purified water outlet, the liquid inlet of the separator is connected with the liquid outlet of the wastewater tank, the purified water outlet of the separator is connected with the water inlet of the purified water tank, the separator is provided with a compressible separation cavity, the compressible separation cavity is respectively communicated with the liquid inlet and the purified water outlet, a filter element is filled in the compressible separation cavity, the filter element comprises a porous matrix, the porous matrix is provided with a three-dimensional through hole, and the surface of the porous matrix is grafted with 2, 3-epoxypropyltrimethylammonium chloride. The invention discloses an oil-water separation method based on the device. The invention has the beneficial effects that: the filter element surface has high hydrophilicity, allows water to pass through and blocks oil to pass through, thereby playing an oil-water separation role, the volume of a compressible separation cavity of the oil-water separation device can be changed, thereby the filter element aperture can be reduced, and the separation requirements of different oily wastewater can be met.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to an oil-water separation device and method for treating wastewater in a metallurgical industrial process.
Background
The treatment of oily wastewater is always a difficult problem in the field of environmental protection. Due to the different properties, the oily and aqueous components generally need to be treated separately. With the stricter environmental requirements, the implementation of new national ultra-clean discharge standards becomes a more challenge in treating oily wastewater to reach high discharge standards. There are some usable oil water separator among the prior art, however, these devices' separation effect is poor and more people do not feel at will, have the problem that separation efficiency is low, the separation is not thorough, with high costs, is difficult to use widely. On the other hand, the production technology of cold-rolled strip steel in the ferrous metallurgy process is continuously developed, the product varieties show diversified trends, the components of cold-rolled oily wastewater are increasingly complex, the treatment difficulty and the treatment cost are continuously increased, and particularly the wastewater of cold-rolled oily wastewater and emulsion is extremely difficult to treat. Therefore, a novel wastewater treatment device and method with stable treatment effect, high automation degree, reasonable investment cost and sustainable development potential are urgently needed to be developed.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an oil-water separator for treating wastewater from metallurgical industry. The technical scheme is as follows:
an oil-water separation device for treating wastewater in a metallurgical industrial process is characterized by comprising a wastewater tank, a separator and a water purifying tank;
the separator is provided with a liquid inlet and a purified water outlet;
the liquid inlet of the separator is connected with the liquid outlet of the wastewater tank, and the purified water outlet of the separator is connected with the water inlet of the purified water tank;
the separator is provided with a compressible separation cavity which is respectively communicated with the liquid inlet and the purified water outlet, and a filter element is filled in the compressible separation cavity;
the filter element comprises a porous matrix, the porous matrix is provided with three-dimensional through holes, and the surface of the porous matrix is grafted with 2, 3-epoxypropyl trimethyl ammonium chloride.
By adopting the design, the surface of the porous matrix has high hydrophilicity after being modified by chemical grafting, so that water is allowed to pass through and oil is prevented from passing through, the oil-water separation effect is achieved, the volume of a compressible separation cavity of the oil-water separation device can be changed, and the filter element can be compressed, so that the aperture of the filter element is changed, and the separation requirements of different oily wastewater are met.
As a preferred technical scheme, the separator comprises a vertically arranged cylinder body, a lower bottom plate is arranged at the lower end of the cylinder body, an upper top plate is arranged at the upper end of the cylinder body, the lower bottom plate is provided with the purified water outlet, and the upper top plate is provided with the liquid inlet;
a movable orifice plate is arranged in the cylinder body in a sliding manner, and the edge of the movable orifice plate is in sealing fit with the inner wall of the cylinder body;
the cylinder between the movable orifice plate and the lower base plate forms the compressible separation chamber, and the movable orifice plate moves towards the lower base plate to compress the filter element.
By adopting the design, the filter element is compressed by moving the movable pore plate, and the structure is simple.
As a preferred technical scheme, a reflux pump is further arranged between the water purifying tank and the wastewater tank.
By adopting the design, when the separated clean water does not meet the design requirement, the clean water is pumped into the waste water tank for separation again.
As a preferred technical scheme, a first flow control valve is arranged between a liquid inlet of the separator and a liquid outlet of the wastewater tank, and a second flow control valve is arranged between a purified water outlet of the separator and a water inlet of the purified water tank.
By adopting the design, the size and the pressure of water flow can be conveniently regulated and controlled, and the separation effect is ensured.
Preferably, the porous substrate is melamine foam.
The above design is adopted because the melamine foam has good mechanical properties and is easy to carry out surface modification.
Preferably, the porous substrate has an average pore diameter of 50 μm.
By adopting the design, the smaller aperture can meet the micro-capsule filtration requirement of the oil-containing emulsion.
The second object of the present invention is to provide an oil-water separation method using the oil-water separation device. The technical scheme is as follows:
the key point of the oil-water separation method is that the method comprises the following steps:
step one, arranging the oil-water separation device for treating the metallurgical industrial process wastewater;
step two, adding a small amount of water into the wastewater tank, and enabling the wastewater tank to flow through the separator so as to fully wet the filter element;
and step three, introducing oily wastewater into the wastewater tank, automatically separating the oily wastewater by virtue of gravity, and enabling purified water to flow into the water purifying tank.
By adopting the method, the oil-water separation is simple and convenient.
As a preferable technical solution, the oil-water separation method further includes a fourth step of detecting physicochemical properties of the oily wastewater in the wastewater tank and the purified water in the purified water tank, adjusting the opening sizes of the first flow control valve and the second flow control valve, adjusting the position of the movable orifice plate to compress the filter element to reduce the pore size thereof, and repeating the third step.
By adopting the method, the water flow pressure and the flow velocity are adapted to the oil-water separation requirement, and the water passing rate is as high as possible while the separation effect is ensured.
As a preferable technical solution, in the fourth step, if the oil content of the purified water in the purified water tank is higher than a design standard, the reflux pump operates to pump the purified water in the purified water tank into the wastewater tank, reduce the opening degree of the first flow control valve, compress the filter element, and then repeat the third step.
By adopting the method, the oil-water separation is ensured to be sufficient repeatedly for many times.
Compared with the prior art, the invention has the beneficial effects that: the surface of the porous matrix is chemically grafted and modified to have high hydrophilicity, so that water is allowed to pass through and oil is prevented from passing through, an oil-water separation effect is achieved, the volume of a compressible separation cavity of the oil-water separation device for treating the metallurgical industrial process wastewater can be changed, and a filter element can be compressed, so that the aperture of the filter element is reduced, and the separation requirements of different oily wastewater are met.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the separator;
FIG. 3 is a reaction formula for surface modification of melamine foam;
FIG. 4 is a schematic structural view of a melamine foam under scanning electron microscopy before modification (a) and after modification (b);
FIG. 5 is an appearance view before and after the separation of the emulsion and a picture under a microscope;
FIG. 6 is a graph showing the change in separation efficiency of the foam after repeated separations.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
Example 1
1. Oil-water separation device for treating wastewater of metallurgical industrial process
As shown in figure 1, the oil-water separation device for treating the wastewater of the metallurgical industrial process comprises a wastewater tank 1, a separator 3 and a water purifying tank 5. The separator 3 is provided with a liquid inlet and a purified water outlet; a liquid inlet of the separator 3 is connected with a liquid outlet of the wastewater tank 1, and a purified water outlet of the separator 3 is connected with a water inlet of the purified water tank 5; the separator 3 is provided with a compressible separation cavity which is respectively communicated with the liquid inlet and the purified water outlet, and a filter element 3a is filled in the compressible separation cavity. The filter element 3a comprises a porous matrix, the porous matrix is provided with three-dimensional through holes, and the surface of the porous matrix is grafted with 2, 3-epoxypropyltrimethylammonium chloride.
A reflux pump 6 is also arranged between the water purifying tank 5 and the wastewater tank 1. A first flow control valve 2 is arranged between the liquid inlet of the separator 3 and the liquid outlet of the wastewater tank 1, and a second flow control valve 4 is arranged between the purified water outlet of the separator 3 and the water inlet of the purified water tank 5.
As shown in fig. 2, the separator 3 includes a vertically arranged cylinder 3b, a lower bottom plate 3c is integrally formed at the lower end of the cylinder 3b, an upper top plate 3d is detachably fastened and covered at the upper end of the cylinder 3b, the lower bottom plate 3c is provided with the purified water outlet, and the upper top plate 3d is provided with the liquid inlet.
A movable pore plate 3e is arranged in the cylinder 3b in a sliding mode, the edge of the movable pore plate 3e is in sealing fit with the inner wall of the cylinder 3b, the compressible separation cavity is formed between the movable pore plate 3e and the cylinder 3b between the lower bottom plate 3c, and the movable pore plate 3e moves towards the lower bottom plate 3c to compress the filter element 3 a.
Specifically, the edge of the movable orifice plate 3e is in threaded fit with the inner wall of the cylinder 3b, so that the movable orifice plate 3e can be adjusted up and down conveniently.
The porous substrate is melamine foam. The porous matrix has an average pore diameter of 50 μm.
During the in-service use, still can set up only control system and on-line measuring device, detect the materialization characteristic of waste water and the materialization characteristic of purified water, control system is according to the data that obtain that detect, and the aperture of first flow control valve 2 and second flow control valve 4 is adjusted to the control system, still can adjust the position of movable orifice plate 3e in order to change the aperture of filter core 3a to satisfy the requirement of water oil separating.
2. Preparation of the Filter element
A method of making the filter cartridge of example 1, comprising:
pretreatment of melamine foam: melamine foam with a certain thickness and three-dimensional through holes is selected as a porous base material, and the average pore size of the porous base material is about 50 microns. The foam was processed to the desired size and then the different sized foams were sonicated in ethanol solution and subjected to ultrasonic cleaning for 30 minutes. Then taking out the foam, and drying the foam in an oven at 50 ℃;
chemical modification of melamine foam: respectively immersing the dried melamine foams with different sizes into a sodium hydroxide solution with the mass concentration of 7%, keeping the temperature of the solution at 50 ℃, then adding different amounts of 2, 3-epoxypropyltrimethylammonium chloride (GTMAC) into the sodium hydroxide solution, wherein the mass ratio of the GTMAC to the melamine foam is 1:1, and stirring for 5 hours to carry out reaction, wherein the reaction process of the reaction is shown in figure 3;
subsequently, the foam was taken out and the surface of the foam was washed with clean water for residual sodium hydroxide and 2, 3-epoxypropyltrimethylammonium chloride, and dried to complete the modification.
3. Characterization of foam physical Properties
3.1 morphology
The morphology of the foam before and after modification was observed under a scanning electron microscope, respectively, as shown in fig. 4(a) and 4 (b). It can be seen that the foam morphology after modification has not changed significantly.
3.2 contact Angle
In the air, the dynamic contact angle of a water drop on the surface of the modified foam is 0 degrees, which shows that the water wettability is good; for the organic solvent isooctane, the underwater contact angle of the organic solvent isooctane on the surface of the modified foam is 160 degrees. The pre-wetted foam was placed in the oil and then removed and placed in the water, whereupon the oil was observed to immediately spread from the foam, and no oil droplets were observed to be adsorbed on the surface of the foam to the naked eye.
4. Verification of oil-water separation effect of modified foam
4.1 preparation of oil-water emulsion
To prepare a surfactant-free oil-water emulsion, 20mL of lubricating oil was added to 180mL of water, and the mixture was sonicated for 30 min. To prepare a surfactant-stabilized oil-in-water emulsion, 0.02g of tween 80 was dissolved in 200mL of water, 2.0mL of a lubricating oil (loson (LOSH) antiwear hydraulic oil No. 32, commercial code: 25154759762) was added, and then the mixed solution was vigorously stirred for 3 hours. The emulsion preparation method of other oil (great wall antiwear hydraulic oil L-HM46 rail oil mechanical oil No. 32, commodity number: 51274543333; Meilian brand previtan L-HM46 antiwear hydraulic oil No. 32, commodity number: 52733106796) refers to lubricating oil.
4.2 oil-water separation test
The method comprises the steps of fixing chemically unmodified melamine foam and chemically modified melamine foam which are 1-5 cm in thickness between two glass containers with the diameter of 34mm respectively. All of the foams described above were pre-wetted with water prior to the oil-water separation test. The mixed liquid of oil and water is poured into a container and then gravity is relied upon to separate the oil and water. The filtered water was collected, and the content of oil contained therein was detected by gas chromatography-flame ionization [ GC/FID; 5890(HP) and 7890(Agilent) ]. The oil removal rate in the filtrate in surfactant stabilised oil-in-water emulsions was determined by measuring the oil content in the feed and the corresponding filtrate using a UV-Vis spectrophotometer (Evolution 201, Thermo Scientific). Wherein the oil was stained with sudan blue II.
The modified foam can separate oil and water of different kinds of oily wastewater, and the oil content in the separated water is measured to be smallAt 1 PPM. The modified foam is measured to have an ultra-fast water passing speed which can reach 95000 L.m-2·h-1. Separating 1L of oil-water mixture, and testing through continuous experiments to ensure that the oil content in water is still less than 1PPM and the water passing rate is not obviously changed.
The modified foam also allows for separation of waste water containing oil emulsions. The prepared foam was compressed, the compressed modified foam was fixed in a syringe having a diameter of 19mm, and then the oily emulsion wastewater was separated. The size of the separated emulsion is less than 20 μm. After separation, the oil content in the water was less than 3 ppm. As shown in fig. 3, the wastewater of the oil-containing emulsion was milky in appearance, microcapsules were visible under a microscope, the appearance of the separated water was transparent, and no microcapsules were visible under a microscope.
After 1L of the emulsion wastewater was separated, ultrasonic cleaning was performed with ethanol for 20 minutes. Then the separation is repeated for 10 times, and the oil-water separation efficiency is still higher than 99%, as shown in figure 4. After multiple times of separation, the mechanical property, the wettability and the oil-water emulsion separation characteristic of the modified foam are basically unchanged.
Example 2
An oil-water separation method based on the oil-water separation device of embodiment 1 is characterized by comprising the following steps:
step one, setting the oil-water separation device, opening the upper top plate 3d, taking out the movable pore plate 3e, putting modified foam with proper size into the separator 3, and then sequentially loading the movable pore plate 3e and the upper top plate 3d with a buckle cover;
step two, adding a small amount of water into the wastewater tank 1, making the water flow through a liquid inlet, flowing through holes on a movable orifice plate 3e, and then flowing through a filter element 3a to make the water fully wet;
and step three, introducing oily wastewater into the wastewater tank 1, automatically separating the oily wastewater by virtue of gravity, and enabling purified water to flow into the purified water tank 5.
After the separation is completed, the oil phase is positioned in a pipeline or a waste water tank 1 above the filter element and is discharged independently.
According to the actual separation condition, the physicochemical properties of the oily wastewater in the wastewater tank 1 and the purified water in the purified water tank 5 are detected, the opening sizes of the first flow control valve 2 and the second flow control valve 4 are adjusted, the position of the movable orifice plate 3e is adjusted to compress the filter element 3a so as to reduce the aperture of the filter element, and the third step is repeated.
In the fourth step, if the oil content of the purified water in the purified water tank 5 is higher than the design standard, the reflux pump 6 works to pump the purified water in the purified water tank 5 into the wastewater tank 1, reduce the opening degree of the first flow control valve 2, and repeat the third step; or after compressing the filter element 3a, repeating the third step. The flow speed is reduced, the aperture of the filter element is reduced, and the oil-water separation efficiency is improved.
When the separation effect of the filter element is reduced, the filter element can be taken out, and can be regenerated after being ultrasonically cleaned by ethanol and can be reused.
Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.
Claims (4)
1. The utility model provides a handle oil water separator of metallurgical industry process waste water which characterized in that: comprises a wastewater tank (1), a separator (3) and a water purifying tank (5);
the separator (3) is provided with a liquid inlet and a purified water outlet;
a liquid inlet of the separator (3) is connected with a liquid outlet of the wastewater tank (1), and a purified water outlet of the separator (3) is connected with a water inlet of the purified water tank (5);
the separator (3) is provided with a compressible separation cavity which is respectively communicated with the liquid inlet and the purified water outlet, and a filter element (3 a) is filled in the compressible separation cavity;
a reflux pump (6) is also arranged between the water purifying tank (5) and the wastewater tank (1);
a first flow control valve (2) is arranged between the liquid inlet of the separator (3) and the liquid outlet of the wastewater tank (1), and a second flow control valve (4) is arranged between the purified water outlet of the separator (3) and the water inlet of the purified water tank (5);
the separator (3) comprises a vertically arranged cylinder body (3 b), the lower end of the cylinder body (3 b) is provided with a lower bottom plate (3 c), the upper end of the cylinder body (3 b) is provided with an upper top plate (3 d), the lower bottom plate (3 c) is provided with the purified water outlet, and the upper top plate (3 d) is provided with the liquid inlet;
a movable orifice plate (3 e) is arranged in the cylinder body (3 b) in a sliding manner, and the edge of the movable orifice plate (3 e) is in sealing fit with the inner wall of the cylinder body (3 b);
the cylinder (3 b) between the movable orifice plate (3 e) and the lower bottom plate (3 c) forms the compressible separation chamber, the movable orifice plate (3 e) moves towards the lower bottom plate (3 c) to compress the filter element (3 a);
the filter element (3 a) comprises a porous matrix, the porous matrix is provided with three-dimensional through holes, and the surface of the porous matrix is grafted with 2, 3-epoxypropyltrimethylammonium chloride;
the porous matrix is melamine foam;
the average pore diameter of the porous matrix is 50 μm;
the preparation process of the filter element comprises the following steps:
pretreatment of melamine foam: selecting melamine foam with a certain thickness and three-dimensional through holes as a porous base material, wherein the average pore size of the porous base material is 50 microns; processing foams into required sizes, then putting the foams with different sizes into an ethanol solution for ultrasonic treatment, and carrying out ultrasonic cleaning for 30 minutes; then taking out the foam, and drying the foam in an oven at 50 ℃;
chemical modification of melamine foam: respectively immersing the dried melamine foams with different sizes into a sodium hydroxide solution with the mass concentration of 7%, keeping the temperature of the solution at 50 ℃, then adding different amounts of 2, 3-epoxypropyltrimethylammonium chloride into the sodium hydroxide solution, wherein the mass ratio of the 2, 3-epoxypropyltrimethylammonium chloride to the melamine foams is 1:1, and stirring for 5 hours to react;
subsequently, the foam was taken out and the surface of the foam was washed with clean water for residual sodium hydroxide and 2, 3-epoxypropyltrimethylammonium chloride, and dried to complete the modification.
2. An oil-water separation method using the oil-water separation device according to claim 1, characterized by comprising the steps of:
step one, setting the oil-water separation device;
step two, adding a small amount of water into the wastewater tank (1) and enabling the water to flow through the separator (3) so as to fully wet the filter element (3 a);
and step three, introducing oily wastewater into the wastewater tank (1), automatically separating the oily wastewater by means of gravity, and enabling purified water to flow into the water purifying tank (5).
3. The oil-water separation method according to claim 2, characterized in that: the method also comprises a fourth step of detecting physicochemical properties of the oily wastewater in the wastewater tank (1) and the purified water in the purified water tank (5), adjusting the opening sizes of the first flow control valve (2) and the second flow control valve (4), adjusting the position of the movable orifice plate (3 e) to compress the filter element (3 a) so as to reduce the aperture of the filter element, and repeating the third step.
4. The oil-water separation method according to claim 3, characterized in that: in the fourth step, if the oil content of the purified water in the purified water tank (5) is higher than the design standard, the reflux pump (6) works to pump the purified water in the purified water tank (5) into the wastewater tank (1), then the opening degree of the first flow control valve (2) is reduced, the filter element (3 a) is compressed, and then the third step is repeated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010062622.2A CN111196620B (en) | 2020-01-20 | 2020-01-20 | Oil-water separation device and method for treating wastewater in metallurgical industrial process |
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| CN202010062622.2A CN111196620B (en) | 2020-01-20 | 2020-01-20 | Oil-water separation device and method for treating wastewater in metallurgical industrial process |
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| CN111196620A CN111196620A (en) | 2020-05-26 |
| CN111196620B true CN111196620B (en) | 2022-04-22 |
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| CN103755052A (en) * | 2014-01-26 | 2014-04-30 | 西安瑞蓝机电设备有限公司 | Method and system for treating petroleum refining wastewater electro-desalting black liquor |
| CN106589201A (en) * | 2015-10-15 | 2017-04-26 | 中国科学院过程工程研究所 | Hydrophilic modification method of polystyrene material and product thereof |
| CN106955676A (en) * | 2017-03-18 | 2017-07-18 | 华南理工大学 | A kind of temperature-responsive water-oil separating foam and preparation method thereof |
| CN107540105A (en) * | 2016-06-28 | 2018-01-05 | 宝山钢铁股份有限公司 | A kind of deoiling method and its device of the dense oil emulsion waste water of cold rolling |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103755052A (en) * | 2014-01-26 | 2014-04-30 | 西安瑞蓝机电设备有限公司 | Method and system for treating petroleum refining wastewater electro-desalting black liquor |
| CN106589201A (en) * | 2015-10-15 | 2017-04-26 | 中国科学院过程工程研究所 | Hydrophilic modification method of polystyrene material and product thereof |
| CN107540105A (en) * | 2016-06-28 | 2018-01-05 | 宝山钢铁股份有限公司 | A kind of deoiling method and its device of the dense oil emulsion waste water of cold rolling |
| CN106955676A (en) * | 2017-03-18 | 2017-07-18 | 华南理工大学 | A kind of temperature-responsive water-oil separating foam and preparation method thereof |
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