CN118364208B - Method and device for calculating maximum submerging depth of hydrostatic-pressure-controlled oil-water separation system - Google Patents
Method and device for calculating maximum submerging depth of hydrostatic-pressure-controlled oil-water separation system Download PDFInfo
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Abstract
The application provides a calculation method and a device for the maximum submerged depth of a hydrostatic-pressure-controlled oil-water separation system, wherein the oil-water separation device comprises a selective filtering system and a hydrostatic-pressure control system; the selective filtering system comprises an oil outlet column and a water outlet column; filling the super-hydrophobic super-oleophylic medium into the filter column to obtain an oil outlet column, and filling the super-hydrophilic super-oleophylic medium into the filter column to obtain a water outlet column; the oil outlet column and the water outlet column are horizontally arranged in parallel, and the oil outlet column is connected with the oil outlet pipe; the water outlet column is connected with the water outlet pipe; the application provides a solution to the intrusion problem when a special wettability medium is used for selective oil-water separation, namely, a method for controlling the submerged depth of a selective filtering system to be smaller than the maximum submerged depth is provided while a maximum submerged depth calculation formula is provided. The method has great significance for improving the quality of the effluent (oil outlet), and provides a certain theoretical basis for the application of special wettability media in the field of selectively filtering oil and water.
Description
Technical Field
The invention belongs to the technical field of wettability oil-water separation devices, and particularly relates to a method and a device for calculating the maximum submerged depth of a hydrostatic-pressure-controlled oil-water separation system.
Background
Prior art 2023116382679 discloses that by adding modified corncob in the device, promote the adsorption effect to emulsified oil and dissolved oil in water, convenient effectual oil that gets rid of is difficult to. However, this technique can only treat trace amounts of emulsified oil and dissolved oil in wastewater, and the adsorbent becomes ineffective when it is used in the case of oil-water mixtures having a high oil content. The oil-water separation principle of the device is adsorption, the specification does not mention how the adsorbent is desorbed, and the adsorbent is disposable and needs to be replaced with filler.
In the scheme disclosed in prior art 2021101586231, oil-water separation room top is equipped with adsorption chamber, the electric oxidation room that communicates in proper order with the oil-water separation room, is equipped with the grid in the adsorption chamber, is equipped with oil absorption cotton layer and active carbon layer on the grid in proper order, and the adsorption chamber water inlet is located the grid below, and the adsorption chamber delivery port is located the grid top, and adsorption chamber water inlet department is equipped with the pipeline of stretching into in the oil-water separation room, is equipped with the intake pump on the pipeline of No. one: the water quality sensor is arranged at the water outlet of the electro-oxidation chamber, the electro-oxidation chamber top is provided with the electro-oxidation chamber gas collecting hood, the water outlet of the electro-oxidation chamber is provided with the water outlet main pipe, the water outlet main pipe is divided into two paths which are respectively a water outlet branch pipe and a reflux branch pipe, the reflux branch pipe is communicated with the adsorption chamber, the water outlet branch pipe is provided with the water outlet pump and the water outlet valve, and the reflux branch pipe is provided with the reflux pump and the reflux valve. In the invention, the water discharged from the oil-water separation tank is discharged after further treatment reaches the national standard. The process related by the scheme is too complex, and the electrooxidation method further increases the treatment energy consumption, which is not beneficial to environmental protection.
The hydrophilic or lipophilic medium is a material commonly used for filtering oily wastewater, and in the process of selectively filtering the oily wastewater, the capillary force generated by a micro-channel of the super-hydrophilic or super-lipophilic medium is repulsive force for lyophobic liquid; the capillary forces generated by the microchannels are attractive forces for the lyophile liquids. When the hydrostatic pressure of the lyophobic liquid is larger than the repulsive capillary force of the medium, the lyophobic liquid can invade the super-hydrophilic super-oleophobic medium, namely the oil phase invades the super-hydrophilic super-oleophobic medium, and the water phase invades the super-hydrophobic super-oleophilic medium, so that the water content of the discharged oil becomes high, and the water content of the discharged oil becomes high, so that the filter medium becomes invalid. The invasion problem is the biggest problem affecting the treatment effect of the oily wastewater in the process of selectively filtering the oily wastewater by the super-hydrophilic super-oleophobic or super-hydrophobic super-oleophilic medium.
The technology for treating the oily wastewater based on the prior art has the defects, and the research and development of the oil-water separation technology which can solve the invasion problem, is simple to operate, environment-friendly, can treat the wastewater with high oil content and has thorough oil-water separation is a technical problem to be solved urgently.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention provides a method for calculating the maximum submerged depth of an oil-water separation system based on the theory of selective filtration of special wettability materials, and a control method for controlling the submerged depth of the selective filtration system to be not larger than the maximum submerged depth. The oil phase is prevented from invading the super-hydrophilic super-oleophobic medium, and the water phase is prevented from invading the super-hydrophobic super-oleophilic medium. The quality of the effluent (oil outlet) is improved, and the medium failure is avoided.
The oil-water separation device comprises a selective filtering system and a hydrostatic control system. The selective filtration system includes a selective water outlet system and a selective oil outlet system. The oil-water separation system can separate oil-water mixed liquid and oil-water emulsion with various concentrations, and is suitable for oil with various specific gravities.
Specifically, according to the method for calculating the maximum submerged depth of the hydrostatic-pressure-controlled oil-water separation system, the maximum submerged depth h max is calculated by calculating hydrostatic pressure and intrusion pressure, the maximum submerged depth h max is the maximum height from the liquid level to the bottom of an oil or water outlet column, namely the maximum depth from the oil outlet column or water outlet column to below the liquid level, the liquid level is a gas-liquid interface, and the maximum submerged depth h max is calculated by calculating the hydrostatic pressure and intrusion pressure;
Step SS1, calculate hydrostatic pressure, ① hydrostatic pressure:
；
Step SS2, calculating intrusion pressure, ② intrusion pressure:
From Laplace equation
；
Step SS3, combining two formulas of hydrostatic pressure and intrusion pressure, and calculating the maximum submerged depth h max,③ and the maximum submerged depth h max,, namely the height from the liquid level to the bottom of the oil or water outlet column;
；
further, when the oil density in the oily wastewater is less than the water density and the bottom of the selective filtration system is located below the oil-water interface, the maximum submerged depth is:
；
further, when the oil density in the oily wastewater is less than the water density and the bottom of the selective filtration system is located above the oil-water interface, the maximum flooding depth is:
；
further, when the oil density in the oily wastewater is greater than the water density, and the bottom of the selective filtration system is located below the oil-water interface, the maximum submerged depth is:
；
Further, when the oil density in the oily wastewater is greater than the water density and the bottom of the selective filtration system is located above the oil-water interface, the maximum flooding depth is:
；
further, when the oily wastewater is an oil-water emulsion, the maximum flooding depth is:
；
in all the above formulas:
represents hydrostatic pressure;
Representing the density of the liquid;
representing gravitational acceleration;
Indicating the height of the liquid particle to the free liquid surface;
represents theoretical capillary pressure;
Indicating the surface tension of the liquid;
a lyophobic liquid contact angle representing a medium of special wettability;
representing a maximum flooding depth;
represents the density of water;
indicating the density of the oil;
indicating the surface tension of the oil;
Represents the surface tension of water;
represents the underwater oil contact angle of the super-hydrophilic super-oleophobic medium;
Represents the oil-water contact angle of the super-hydrophobic super-oleophilic medium;
representing the radius of a micro-channel in an oil (water outlet) outlet column filled with a special wettability medium;
Indicating the volume ratio of the oil.
The application also provides an oil-water separation device applying the calculation method of the maximum submerged depth of the hydrostatic control oil-water separation system, and the oil-water separation device comprises a selective filtering system and a hydrostatic control system; the selective filtering system comprises an oil outlet column and a water outlet column; filling the super-hydrophobic super-oleophylic medium into the filter column to obtain an oil outlet column, and filling the super-hydrophilic super-oleophylic medium into the filter column to obtain a water outlet column; the oil outlet column and the water outlet column are horizontally arranged in parallel, and the oil outlet column is connected with the oil outlet pipe; the water outlet column is connected with the water outlet pipe; the oil-water separation device is formed.
Further, when the number of the oil-water separation devices is 3, the oily wastewater output by the water outlet column and the oil outlet column of the selective filtering system of the first oil-water separation device respectively enters the selective filtering system of the second oil-water separation device and the selective filtering system of the third oil-water separation device, and the second oil-water separation device and the third oil-water separation device are arranged in parallel.
Further, the first oil-water separation device is a first-stage filtration module, the second and third oil-water separation devices are second-stage filtration modules, and according to the requirements of oily wastewater treatment, the second oil-water separation device is connected in series with a fourth and fifth oil-water separation device which are arranged in parallel, and the fourth and fifth oil-water separation devices respectively filter water and oil filtered by a water outlet column and an oil outlet column of the second oil-water separation device; the third oil-water separation device is connected in series with a sixth and a seventh selective oil-water separation devices which are arranged in parallel, and the sixth and the seventh oil-water separation devices respectively filter water and oil filtered by a water outlet column and an oil outlet column of the third oil-water separation device; the fourth, fifth, sixth and seventh oil-water separation devices are three-stage filtering modules.
Further, the flooding depth of the selective filtration system is no greater than the maximum flooding depth; the water outlet column and the oil outlet column float on the water surface, and float is realized by a floating ball or a mechanical arm.
Compared with the prior art, the invention has the following beneficial effects:
1. The invention provides a solution to the invasion problem when the special wettability medium is used for selective oil-water separation, namely, provides a method for controlling the submerged depth of the selective filtering system to be smaller than the maximum submerged depth while providing a maximum submerged depth calculation formula, which has great significance for improving the quality of effluent (oil outlet) and provides a certain theoretical basis for the application of the special wettability medium in the field of selective filtering oil and water.
2. The invention provides a calculation method of the maximum submerged depth of a hydrostatic-pressure-controlled oil-water separation system, designs a set of oil-water separation device based on the theory, establishes an assembled module-system similar to a building block, and can be adjusted according to the requirement of a user on the oil-water separation effect.
3. The oil-water separation system can carry out oil-water separation on the oil-containing wastewater with high efficiency and low consumption, the oil separation efficiency of the filtered water is more than 99.99 percent, the water separation efficiency of the filtered oil is more than 99.92 percent, the recycling recovery of the oil can be ensured, and the water can reach the industry emission standard. The method has the advantages of low cost, high efficiency and low energy consumption while avoiding secondary pollution by separating the oily wastewater by gravity without introducing other medicaments.
4. The oil-water separation system can remove the oil-water mixed liquid and the oil-water emulsion, and has the same effect when facing the oil with different specific gravities.
5. The oil-water separation system can also shorten the treatment flow, improve the water outlet quality, and save the construction cost by adopting a mounting mode of hoisting and adjustment.
Drawings
FIG. 1 is a top view of the two-stage oil-water separation system of example 1;
FIG. 2 is a schematic diagram of a "module-system" shown in example 1;
FIG. 3 is a schematic view of the oil level and water level and maximum submerging depth of example 2;
FIG. 4 is a schematic view of the oil level and water level and maximum submerging depth of example 3;
FIG. 5 is a schematic view of example 4 horizontal and oil planes and maximum flooding depth;
FIG. 6 is a schematic view of example 5 horizontal and oil planes and maximum flooding depth;
FIG. 7 is a schematic diagram of the oil-water emulsion plane and the maximum depth of immersion in example 6;
In FIG. 1, an oily wastewater inlet; 2. 1 ＃ secondary modules; 3. 2 ＃ secondary modules; 4. an oil outlet pipe; 5. a water outlet pipe; 6. a water outlet return pipe; 7. an oil outlet return pipe; in fig. 2, 8, primary module; 9. a secondary module; 10. a third-level module; 11. and a four-stage module.
Detailed Description
The invention will be further described with reference to the following specific embodiments, but the examples are not intended to limit the invention in any way. Raw materials reagents used in the examples of the present invention are conventionally purchased raw materials reagents unless otherwise specified.
The technical scheme of the invention is further described below by combining the embodiment cases.
The contact angle is the contact angle between the gas-liquid interface and the solid-liquid interface after the liquid drop is static and balanced on the solid surface, and is called as a lyophile surface when the contact angle is less than 90 degrees; when the contact angle is > 90 °, it is referred to as a lyophobic surface. In particular, when the contact angle is > 150 °, it is referred to as an ultralyophobic surface; the contact angle <5 ° is referred to as a superhydrophilic surface. Super-hydrophilic super-oleophobic media refer to media with a water contact angle in air of less than 5 ° and an oil contact angle under water of greater than 150 °. The super-hydrophobic super-oleophilic medium refers to a medium with a water contact angle of more than 150 degrees and an oil contact angle of less than 5 degrees in air.
Example 1
The embodiment is a hydrostatic-control oil-water separation device, which comprises a selective filtering system and a hydrostatic control system; the selective filtering system comprises an oil outlet column and a water outlet column; filling the super-hydrophobic super-oleophylic medium into the filter column to obtain an oil outlet column, and filling the super-hydrophilic super-oleophylic medium into the filter column to obtain a water outlet column; the oil outlet column and the water outlet column are horizontally arranged in parallel, and the oil outlet column is connected with the oil outlet pipe; the water outlet column is connected with the water outlet pipe; the device can separate oil-water mixed liquid and oil-water emulsion, and is suitable for oil with various specific gravities; when the number of the oil-water separating devices is 3, an oil-water separating system is formed, and the oil-water separating devices exist as modules in the system. As shown in fig. 1, the inlet 1 introduces oily wastewater into the primary oil-water separation module, oil filtered by the selective filtration system of the primary module enters the secondary 1 ＃ module, water enters the secondary 2 ＃ module, and a small amount of water filtered by the selective filtration system of the secondary 1 ＃ module flows back to the primary module, and a large amount of oil is recovered. A small amount of oil filtered by the selective filtering system of the 2 ＃ second-stage module flows back to the first-stage module, and a large amount of water can be recovered and discharged. The 1 ＃ secondary module and the 2 ＃ secondary module are arranged in parallel.
As shown in fig. 2, when the quality of the effluent (oil) of the two-stage oil-water separation module still does not meet the treatment requirement of the oily wastewater, a third-stage oil-water separation module can be additionally arranged. At the moment, water filtered by the second-stage (I) module enters the third-stage (I) module, oil enters the third-stage (II) module, a small amount of oil filtered by the third-stage (I) module flows back to the first-stage module, and a large amount of filtered water is recovered or discharged; and (3) refluxing a small amount of water filtered by the three-stage (II) module to the first-stage module, and recycling a large amount of filtered oil. The water filtered by the second-stage (II) module enters the third-stage (III) module, the oil enters the third-stage (IV) module, a small amount of oil filtered by the third-stage (III) module flows back to the first-stage module, and a large amount of filtered water is recovered or discharged; and (3) refluxing a small amount of water filtered by the three-stage (IV) module to the first-stage module, and recycling a large amount of filtered oil. And so on to the four-level module. In theory, the oil-water separation modules can be infinitely connected in series according to the treatment requirement of the oily wastewater, but in practical application, the oil separation efficiency of the filtered water of the single-stage module is more than 99.99%, the water separation efficiency of the filtered oil is more than 99.92%, and the separation efficiency is excellent.
In the following examples, the point A represents the intersection point of the oil-water interface and the liquid inlet level of the filter column, and the point B represents the lowest point of the liquid inlet level of the filter column.
Example 2
The embodiment provides a calculation method of the maximum submerged depth of a hydrostatic-pressure-controlled oil-water separation system, when oil in oily wastewater is diesel oil and the bottom of a selective filtering system is positioned below an oil-water interface, as shown in fig. 3. Firstly, ensuring that the oil at the point A does not invade the super-hydrophilic super-oleophobic medium, namely, balancing the hydrostatic pressure at the point A and the capillary pressure:
；
；
Secondly, ensuring that the water at the point B does not invade the super-hydrophobic super-oleophylic medium, namely, balancing the hydrostatic pressure at the point B and the capillary pressure:
；
；
the maximum flooding depth is:
；
wherein: The hydrostatic pressure at point a;
the hydrostatic pressure at point B;
represents theoretical capillary pressure;
representing a maximum flooding depth;
representing the maximum distance of the oil level to the horizontal;
Representing the maximum distance from the horizontal plane to the bottom plane of the effluent column;
Indicating the density of the oil and, =830Kg/m3；
The density of the water is indicated and,=1000Kg/m3；
Indicating the acceleration of gravity and,=9.81m/s2；
Represents the radius of a micro-channel in an oil (water outlet) outlet column filled with a medium with special wettability,=0.0001m；
Represents the underwater oil contact angle of the super-hydrophilic super-oleophobic medium,=165°；
Represents the contact angle of water under oil of the super-hydrophobic super-oleophilic medium,=165°；
Indicating the surface tension of the oil,=0.0268N/m；
Indicating the surface tension of the water,=0.0728N/m；
The calculated maximum flooding depth is 0.1542m.
Example 3
The embodiment provides a method for calculating the maximum submerged depth of a hydrostatic-pressure-controlled oil-water separation system, when oil in oily wastewater is diesel oil and the bottom of a selective filtering system is located above an oil-water interface, as shown in fig. 4. Under the condition, the B point oil is only required to be ensured not to invade the super-hydrophilic super-oleophobic medium, namely, the hydrostatic pressure of the B point is balanced with the pressure of the capillary:；
；
wherein: The hydrostatic pressure at point a;
represents theoretical capillary pressure;
representing a maximum flooding depth;
Indicating the density of the oil and, =830Kg/m3；
Indicating the acceleration of gravity and,=9.81m/s2；
Represents the radius of a micro-channel in an oil (water outlet) outlet column filled with a medium with special wettability,=0.0001m；
Represents the underwater oil contact angle of the super-hydrophilic super-oleophobic medium,=165°；
Indicating the surface tension of the oil,=0.0268N/m；
The calculated maximum flooding depth is 0.0636m.
Example 4
The embodiment provides a method for calculating the maximum submerged depth of a hydrostatic-pressure-controlled oil-water separation system, when the oil in the oily wastewater is methylene dichloride and the bottom of a selective filtering system is positioned below an oil-water interface, as shown in fig. 5.
Firstly, ensuring that the water at the point A does not invade the super-hydrophobic super-oleophilic medium, namely, balancing the hydrostatic pressure at the point A and the capillary pressure:
；
；
secondly, ensuring that the B point oil does not invade the super-hydrophilic super-oleophobic medium, namely balancing the hydrostatic pressure of the B point and the pressure of a capillary:
；
；
Then:
；
wherein: The hydrostatic pressure at point a;
the hydrostatic pressure at point B;
represents theoretical capillary pressure;
representing a maximum flooding depth;
representing the maximum distance from the horizontal to the oil level;
representing the maximum distance from the oil level to the bottom level of the effluent column;
Indicating the density of the oil and, =1325Kg/m3；
The density of the water is indicated and,=1000Kg/m3；
Indicating the acceleration of gravity and,=9.81m/s2；
Represents the radius of a micro-channel in an oil (water outlet) outlet column filled with a medium with special wettability,=0.0001m；
Represents the underwater oil contact angle of the super-hydrophilic super-oleophobic medium,=165°；
Represents the contact angle of water under oil of the super-hydrophobic super-oleophilic medium,=165°；
Indicating the surface tension of the oil,=0.0304N/m；
Indicating the surface tension of the water,=0.0728N/m；
The calculated maximum flooding depth is 0.0804m.
Example 5
The embodiment provides a method for calculating the maximum submerged depth of a hydrostatic-pressure-controlled oil-water separation system, when the oil in the oily wastewater is methylene dichloride and the bottom of a selective filtering system is positioned above an oil-water interface, as shown in fig. 6.
Under the condition, the B point oil is only required to be ensured not to invade the super-hydrophilic super-oleophobic medium, namely, the hydrostatic pressure of the B point is balanced with the pressure of the capillary:
；
；
wherein: The hydrostatic pressure at point a;
represents theoretical capillary pressure;
representing a maximum flooding depth;
Indicating the density of the oil and, =1325Kg/m3；
Indicating the acceleration of gravity and,=9.81m/s2；
Represents the radius of a micro-channel in an oil (water outlet) outlet column filled with a medium with special wettability,=0.0001m；
Represents the underwater oil contact angle of the super-hydrophilic super-oleophobic medium,=165°；
Indicating the surface tension of the oil,=0.0304N/m；
The calculated maximum flooding depth is 0.1434m.
Example 6
The embodiment provides a method for calculating the maximum submerged depth of a hydrostatic-pressure-controlled oil-water separation system, and when the oily wastewater is an oil-water emulsion, the method is shown in fig. 7.
In this case, it is necessary to ensure that water in the oil-water emulsion does not invade the superhydrophobic superoleophilic medium and oil does not invade the superhydrophilic superoleophobic medium at the same time, so this is a smaller value.
First, the density of the oil-water emulsion is calculated:；
secondly, ensuring that the B point oil does not invade the super-hydrophilic super-oleophobic medium, namely balancing the hydrostatic pressure of the B point and the pressure of a capillary:
；
；
finally, ensuring that the water at the point B does not invade the super-hydrophobic super-oleophylic medium, namely balancing the hydrostatic pressure at the point B and the capillary pressure:
；
；
Then:
；
wherein: represents the density of the oil-water emulsion;
the volume ratio of the oil is shown, 10% and 90% of diesel oil and 10% and 90% of dichloromethane are respectively taken;
Representing the depth of submergence when the oil invades the super-hydrophilic super-oleophobic medium;
representing the submerged depth of water when the water invades the super-hydrophobic and super-oleophilic medium;
representing a maximum flooding depth;
indicating the density of the oil, the diesel oil is 830Kg/m 3, and the methylene dichloride is 1325Kg/m 3;
the density of the water is indicated and, =1000Kg/m3；
Indicating the acceleration of gravity and,=9.81m/s2；
Represents the radius of a micro-channel in an oil (water outlet) outlet column filled with a medium with special wettability,=0.0001m；
Represents the underwater oil contact angle of the super-hydrophilic super-oleophobic medium,=165°；
Represents the contact angle of water under oil of the super-hydrophobic super-oleophilic medium,=165°；
Indicating the surface tension of oil, diesel oil is 0.0268N/m, and methylene dichloride is 0.0304N/m;
Indicating the surface tension of the water, =0.0728N/m。
The maximum submerged depths are 0.0537m, 0.0623m, 0.0580m and 0.0463m respectively by adopting diesel oil with volume ratio of 10 percent and 90 percent and methylene dichloride oil-water emulsion with volume ratio of 10 percent and 90 percent to calculate.
As can be seen from the embodiment 1, the oil-water separation device has a simple structure and an ingenious conception. The device can carry out oil-water separation on the oil-containing wastewater with high efficiency and low energy consumption, the oil separation efficiency of the filtered water is more than 99.99 percent, and the water separation efficiency of the filtered oil is more than 99.92 percent. Ensures that the oil can be recycled and the water can reach the industry emission standard. The device has the advantages of low cost, no need of introducing other reagents, avoiding secondary pollution, high efficiency and low energy consumption, and the integrated device can shorten the treatment flow and improve the water quality. The installation mode of hoisting and adjusting is adopted, so that the construction cost can be saved.
In the above embodiments 2 to 6, two parameters of oil with different specific gravities are substituted, and the operation condition of the oil-water separator, that is, the maximum submerged depth of the selective filter system is calculated under 5 conditions. Firstly, the placement position of the selective filtering device can be better adjusted through specific calculation data, so that the problems of incomplete oil-water separation, filter material failure and the like caused by the invasion of lyophobic liquid can be avoided, and the operation efficiency of the device can be furthest exerted. Secondly, specific calculation data can verify that the technical scheme of the oil-water separation device is feasible, and the data provide powerful support for the practicability and feasibility of the patent. Finally, the applicability of the oil-water separation device facing different conditions is shown by substituting parameters of oil with different specific gravities and 5 different oil contents for calculation. This shows that the device is not only suitable for a specific oil and oil concentration, but has a wider range of applications and versatility.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it is possible for a person skilled in the art to make several variants and modifications without departing from the inventive concept, which fall within the scope of protection of the present invention.
Claims (9)
1. The method for calculating the maximum submergence depth of the hydrostatic-pressure-controlled oil-water separation system is characterized by comprising the following steps of: when the oil density in the oily wastewater is smaller than the water density and the bottom of the selective filtering system is positioned below an oil-water interface, the oil at the point A is firstly ensured not to invade the super-hydrophilic super-oleophobic medium, namely, the hydrostatic pressure at the point A is balanced with the capillary pressure:
；
；
Secondly, ensuring that the water at the point B does not invade the super-hydrophobic super-oleophylic medium, namely, balancing the hydrostatic pressure at the point B and the capillary pressure:
；
；
the maximum flooding depth is:
；
wherein: represents the density of water;
indicating the density of the oil;
indicating the surface tension of the oil;
representing gravitational acceleration;
Representing the radius of a micro-channel in an oil outlet or water outlet column filled with a special wettability medium;
Represents the surface tension of water;
represents the underwater oil contact angle of the super-hydrophilic super-oleophobic medium;
Represents the oil-water contact angle of the super-hydrophobic super-oleophilic medium;
The hydrostatic pressure at point a;
the hydrostatic pressure at point B;
represents theoretical capillary pressure;
representing a maximum flooding depth;
representing the maximum distance of the oil level to the horizontal;
Representing the maximum distance from the horizontal plane to the bottom plane of the effluent column;
the point A represents the intersection point of the oil-water interface and the liquid inlet level of the filter column, and the point B represents the lowest point of the liquid inlet level of the filter column.
2. The method for calculating the maximum flooding depth of the hydrostatic-controlled oil-water separation system according to claim 1, wherein when the oil density in the oily wastewater is smaller than the water density and the bottom of the selective filtration system is located above the oil-water interface, the maximum flooding depth is:
；
wherein: indicating the density of the oil;
indicating the surface tension of the oil;
Represents the underwater oil contact angle of the super-hydrophilic super-oleophobic medium.
3. The method for calculating the maximum submergence depth of the hydrostatic-controlled oil-water separation system according to claim 1, wherein when the oil density in the oily wastewater is greater than the water density and the bottom of the selective filtration system is located below the oil-water interface, the maximum submergence depth is:
；
wherein: represents the density of water;
indicating the density of the oil;
indicating the surface tension of the oil;
Represents the surface tension of water;
represents the underwater oil contact angle of the super-hydrophilic super-oleophobic medium;
represents the oil-water contact angle of the superhydrophobic superoleophilic medium.
4. The method for calculating the maximum flooding depth of the hydrostatic-controlled oil-water separation system according to claim 1, wherein when the oil density in the oily wastewater is greater than the water density and the bottom of the selective filtration system is located above the oil-water interface, the maximum flooding depth is:
；
wherein: represents the density of water;
Represents the surface tension of water;
represents the oil-water contact angle of the superhydrophobic superoleophilic medium.
5. The method of calculating a maximum flooding depth of a hydrostatically controlled oil-water separation system according to claim 1, wherein when the oily wastewater is an oil-water emulsion, the maximum flooding depth is:
；
wherein: represents the density of water;
indicating the density of the oil;
indicating the surface tension of the oil;
Represents the surface tension of water;
represents the underwater oil contact angle of the super-hydrophilic super-oleophobic medium;
Represents the oil-water contact angle of the super-hydrophobic super-oleophilic medium;
Indicating the volume ratio of the oil.
6. An oil-water separation device applying the method for calculating the maximum submerged depth of the hydrostatically controlled oil-water separation system according to any one of claims 1 to 5, wherein the oil-water separation device comprises a selective filtration system and a hydrostatically controlled system; the selective filtering system comprises an oil outlet column and a water outlet column; filling the super-hydrophobic super-oleophylic medium into the filter column to obtain an oil outlet column, and filling the super-hydrophilic super-oleophylic medium into the filter column to obtain a water outlet column; the oil outlet column and the water outlet column are horizontally arranged in parallel, and the oil outlet column is connected with the oil outlet pipe; the water outlet column is connected with the water outlet pipe; the oil-water separation device is formed.
7. The oil-water separator according to claim 6, wherein when the number of the oil-water separators is 3, the oily wastewater output from the selective filtration system of the first oil-water separator and the oily wastewater output from the oil output column respectively enter the selective filtration system of the second oil-water separator and the selective filtration system of the third oil-water separator, and the second oil-water separator and the third oil-water separator are arranged in parallel.
8. The oil-water separator according to claim 7, wherein the first oil-water separator is a first-stage filter module, the second and third oil-water separators are second-stage filter modules, and according to the requirements of oily wastewater treatment, the second oil-water separator is connected in series with a fourth and fifth oil-water separator, the fourth and fifth oil-water separators are arranged in parallel, and the fourth and fifth oil-water separators respectively filter water and oil filtered by a water column and an oil column of the second oil-water separator; the third oil-water separation device is connected in series with a sixth and a seventh selective oil-water separation devices which are arranged in parallel, and the sixth and the seventh oil-water separation devices respectively filter water and oil filtered by a water outlet column and an oil outlet column of the third oil-water separation device; the fourth, fifth, sixth and seventh oil-water separation devices are three-stage filtering modules.
9. The oil-water separator of claim 6, wherein the selective filter system has a flooding depth no greater than a maximum flooding depth; the water outlet column and the oil outlet column float on the water surface, and float is realized by a floating ball or a mechanical arm.
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| US9186631B2 (en) * | 2010-06-14 | 2015-11-17 | The Regents Of The University Of Michigan | Superhydrophilic and oleophobic porous materials and methods for making and using the same |
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