A method and apparatus for determining the stability of an oil-containing emulsified waste liquid

Abstract

The application provides a method and device for determining the stability of oil-containing emulsified waste liquid, the method comprising diluting the oil-containing emulsified waste liquid into oil-containing emulsified waste liquid with different concentrations; obtaining the Zeta potential of the oil-containing emulsified waste liquid with different concentrations; obtaining the first derivative of the surface tension and concentration of the oil-containing emulsified waste liquid with different concentrations; and determining the stability of the oil-containing emulsified waste liquid according to the Zeta potential and the first derivative. The method for determining the stability of the oil-containing emulsified waste liquid has the advantages of simplicity and easy operation, and the application of the method to the test determination of simulated oil-containing waste liquid has good effects; the method can support the optimization and upgrading of existing processes and the development of green technology, and has application prospects for guaranteeing the high-quality development of enterprises. The application further provides a device for determining the stability of oil-containing emulsified waste liquid, which is used for executing the method for determining the stability of oil-containing emulsified waste liquid established by the application.

Description

Technical Field

[0001] This invention relates to the field of emulsion analysis and detection technology, and in particular to a method and apparatus for determining the stability of oil-containing emulsion waste liquid. Background Technology

[0002] In recent years, significant progress has been made in the classification and treatment technologies and large-scale equipment for waste fluids from unconventional oil and gas reservoir stimulation. However, under the goals of green, environmentally friendly, and low-carbon industrial production, the treatment of oilfield operational waste fluids still faces the need for continuous improvement and optimization. In particular, with the improvement of unconventional oil and gas field production models, the application of polymer fracturing fluids has become more widespread. However, due to the unclear stability and separation mechanisms of oil-containing emulsion waste fluids, there is a lack of basis for optimizing and improving the efficiency of reuse treatment processes, making the treatment of flowback fluids more difficult. It is necessary to overcome the limitations in our understanding of the stability and separation mechanisms of flowback fluids.

[0003] Stability refers to the persistence of emulsions in the environment. Stable emulsions require the presence of emulsifiers, such as clay particles, chemical agents, and naphthenic acids, to form a rigid layer around the dispersed droplets, preventing aggregation. Research on stable oil-containing emulsion systems began earlier abroad. In 1910, Ostwald identified two emulsion types: O / W and W / O, and subsequently proposed various mechanisms for emulsion stability. Among these, the generally accepted stability theory is the charge balance theory. The charge on colloidal particles can originate from three sources: ionization, adsorption, and frictional contact between oil droplets and the medium. Research suggests that the stability of emulsions is attributed to the mutual repulsion of charges on the colloids, making droplets less likely to aggregate, thus stabilizing the emulsion. This involves three parameters: interfacial tension, the properties of the interfacial film, and interfacial charge. With a constant oil-water interfacial area, a decrease in interfacial tension affects the stability of crude oil emulsions in two ways: firstly, it reduces the interfacial free energy, decreasing the emulsion's instability tendency and making it more stable; secondly, it makes emulsification of crude oil and water easier, thus increasing its thermodynamic instability tendency. Interfacial film strength is a major intrinsic factor affecting the stability of crude oil emulsions, especially when solid particles or polymers are adsorbed at the oil-water interface, which enhances the ability to prevent droplet aggregation and makes the emulsion more stable. Although the mechanism and detection methods of the liquid film interface during demulsification have been extensively studied, in-depth analysis is still lacking in research on the multiphase morphology of actual waste liquids containing oil, polymers, clay particles, etc.

[0004] Therefore, in order to meet the technical needs of reducing costs and increasing efficiency in on-site wastewater treatment, there is an urgent need to conduct research on the stability of oil-containing emulsified wastewater. A method for determining the stability of oil-containing emulsified wastewater is urgently needed. Summary of the Invention

[0005] To address the problem that existing methods cannot quickly provide stability information of emulsified waste liquids and are difficult to support efficient and low-cost destabilization processes, this application provides a method and apparatus for determining the stability of oil-containing emulsified waste liquids.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A method for determining the stability of oil-containing emulsified waste liquid, the method comprising:

[0008] The oil-containing emulsified waste liquid was diluted into oil-containing emulsified waste liquids of different concentrations;

[0009] The zeta potentials of oil-containing emulsified waste liquids of different concentrations were obtained;

[0010] The surface tension and first derivative of oil-containing emulsified waste liquids with different concentrations were obtained.

[0011] The stability of the oil-containing emulsified waste liquid is determined based on the Zeta potential and the first derivative.

[0012] Furthermore, determining the stability of the oil-containing emulsified waste liquid specifically includes:

[0013] Determine the concentration C1 at which the absolute value of the Zeta potential is maximized;

[0014] Determine the concentration C2 at the point of abrupt change in the first derivative;

[0015] The stability of the oil-containing emulsified waste liquid is determined based on the concentration C1 and / or the concentration C2.

[0016] Furthermore, determining the stability of the oil-containing emulsified waste liquid based on the concentration C1 and / or the concentration C2 specifically includes:

[0017] The stability of the oil-containing emulsified waste liquid is determined based on the ratio R of the concentrations C1 and C2.

[0018] Where R = C1 / C2;

[0019] When R≥3, the oil-containing emulsified waste liquid is very stable;

[0020] 1.5≤R<3, oil-containing emulsified waste liquid is stable;

[0021] R < 1.5, indicating that the oil-containing emulsified waste liquid is unstable.

[0022] Furthermore, the higher the concentration C1, the lower the stability of the oil-containing emulsified waste liquid.

[0023] Furthermore, the lower the concentration C2, the higher the stability of the oil-containing emulsified waste liquid.

[0024] Further, determining the concentration C2 specifically includes:

[0025] Based on the relationship between surface tension and concentration of oily emulsified waste liquids of different concentrations, the first derivative of surface tension with concentration is obtained;

[0026] When the first derivative has only one abrupt change point, the concentration corresponding to the abrupt change point is concentration C2.

[0027] When there are multiple abrupt change points in the first derivative, the lowest concentration corresponding to each abrupt change point is concentration C2.

[0028] Furthermore, the process of diluting the oily emulsified wastewater into oily emulsified wastewater of different concentrations specifically includes:

[0029] It is prepared by mixing and diluting deionized water with oil-containing emulsified waste liquid, and the volume concentration range of different concentrations of oil-containing emulsified waste liquid is 1-100%.

[0030] The present invention also provides a device for determining the stability of oil-containing emulsified wastewater, the device comprising an acquisition unit and a determination unit.

[0031] The acquisition unit is used to acquire the Zeta potential of oil-containing emulsion waste liquids of different concentrations and the surface tension and first derivative of the concentration of oil-containing emulsion waste liquids of different concentrations; wherein, the oil-containing emulsion waste liquids of different concentrations are prepared by diluting oil-containing emulsion waste liquids.

[0032] The determination unit is used to determine the stability of oil-containing emulsified waste liquid based on the Zeta potential and first derivative obtained by the acquisition unit.

[0033] Furthermore, the determination unit determines the stability of the oil-containing emulsified waste liquid specifically by including:

[0034] Determine the concentration C1 at which the absolute value of the Zeta potential is maximized;

[0035] Determine the concentration C2 at the point of abrupt change in the first derivative:

[0036] When the first derivative has only one abrupt change point, the concentration corresponding to the abrupt change point is concentration C2; when the first derivative has multiple abrupt change points, the lowest concentration corresponding to the abrupt change point is concentration C2.

[0037] The stability of the oil-containing emulsified waste liquid is determined based on the concentration C1 and / or the concentration C2.

[0038] Furthermore, the determination unit determines the stability of the oil-containing emulsified waste liquid specifically by including:

[0039] The stability of the oil-containing emulsified waste liquid is determined based on the ratio R of the concentrations C1 and C2.

[0040] Where R = C1 / C2;

[0041] When R≥3, the oil-containing emulsified waste liquid is very stable;

[0042] 1.5≤R<3, oil-containing emulsified waste liquid is stable;

[0043] R < 1.5, indicating that the oil-containing emulsified waste liquid is unstable.

[0044] Furthermore, the higher the concentration C1 determined by the unit, the lower the stability of the oil-containing emulsified waste liquid.

[0045] Furthermore, the smaller the concentration C2 determined by the unit, the higher the stability of the oil-containing emulsified waste liquid.

[0046] Further, determining the concentration C2 by the determining unit specifically includes:

[0047] Based on the relationship between surface tension and concentration of oily emulsified waste liquids of different concentrations, the first derivative of surface tension with concentration is obtained;

[0048] When the first derivative has only one abrupt change point, the concentration corresponding to the abrupt change point is concentration C2.

[0049] When there are multiple abrupt change points in the first derivative, the lowest concentration corresponding to each abrupt change point is concentration C2.

[0050] Furthermore, the volume concentration range of the oil-containing emulsified wastewater of different concentrations is 1 to 100%.

[0051] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0052] (1) The method for determining the stability of oil-containing emulsified waste liquid provided by the present invention has the advantages of being simple and easy to operate. The method of the present invention is applied to the test of simulated oil-containing waste liquid and the results are good.

[0053] (2) The method of the present invention also helps to identify the interaction and separation mechanisms of pollutants in complex systems; the stability analysis method of the oil-containing emulsified waste liquid can also support the optimization and upgrading of existing processes and the development of green technologies, and has the application prospect of ensuring the high-quality development of enterprises.

[0054] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0056] Figure 1 This is a flowchart of a stability testing method for oil-containing emulsified waste liquid in an embodiment of the present invention;

[0057] Figure 2 The curves showing the relationship between Zeta potential and volume concentration for samples with different volume concentrations in Example 1 of this invention;

[0058] Figure 3 The surface tension and volume concentration relationship curves of samples with different volume concentrations in Example 1 of this invention are shown.

[0059] Figure 4 This is the curve showing the relationship between the first derivative of surface tension and volume concentration and different volume concentrations in Example 1 of the present invention.

[0060] Figure 5 This is a schematic diagram of a stability testing device for oil-containing emulsified waste liquid in an embodiment of the present invention. Detailed Implementation

[0061] The technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] In one embodiment of the present invention, a method for determining the stability of oil-containing emulsified waste liquid is provided, and the flowchart of the method is as follows: Figure 1 As shown, the method includes:

[0063] The oil-containing emulsified waste liquid was diluted into oil-containing emulsified waste liquids of different concentrations;

[0064] The zeta potentials of oil-containing emulsified waste liquids of different concentrations were obtained;

[0065] The surface tension and first derivative of oil-containing emulsified waste liquids with different concentrations were obtained.

[0066] The stability of the oil-containing emulsified waste liquid is determined based on the Zeta potential and the first derivative.

[0067] Furthermore, the method for determining the stability of the oil-containing emulsified waste liquid specifically includes:

[0068] Deionized water was mixed and diluted with oil-containing emulsified waste liquid to prepare oil-containing emulsified waste liquid samples with volume concentrations of 1%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100%.

[0069] The Zeta potential of oil-containing emulsified waste liquid samples with different volume concentrations was tested to determine the volume concentration C1 at which the absolute value of the Zeta potential is the largest. The larger the volume concentration C1, the lower the stability of the oil-containing emulsified waste liquid.

[0070] The surface tension of oil-containing emulsified waste liquid samples with different volume concentrations was tested. Based on the relationship between surface tension and the first derivative of volume concentration and different volume concentrations, the volume concentration C2 at the point of abrupt change in the first derivative was determined.

[0071] Because the emulsification process in actual oil-containing emulsion waste liquid samples is very complex, there may be multiple abrupt changes in the first derivative; determining the volume concentration C2 at the time of the first derivative abrupt change specifically includes:

[0072] When the first derivative has only one abrupt change point, the volume concentration corresponding to the abrupt change point is volume concentration C2; when the first derivative has multiple abrupt change points, the lowest volume concentration corresponding to the abrupt change point is volume concentration C2.

[0073] The lower the volume concentration C2, the higher the stability of the oil-containing emulsified waste liquid.

[0074] The stability of the oil-containing emulsified waste liquid is also determined based on the ratio R of the concentration-volume C1 and the volume concentration C2.

[0075] Where R = C1 / C2;

[0076] When R≥3, the oil-containing emulsified waste liquid is very stable;

[0077] 1.5≤R<3, oil-containing emulsified waste liquid is stable;

[0078] R < 1.5, indicating that the oil-containing emulsified waste liquid is unstable.

[0079] The stability determination method for oil-containing emulsified wastewater according to an embodiment of the present invention is simple in procedure, requiring no complex equipment or analytical reagents containing organic matter. It involves diluting the original oil-containing emulsified wastewater with deionized water to create a series of oil-containing emulsified wastewater solutions with lower volume concentrations, and then measuring surface tension and Zeta potential to analyze the stability of the oil-containing wastewater. The method also helps identify the interaction and separation mechanisms of pollutants in complex systems, and can support the optimization and upgrading of existing processes and the development of green technologies, demonstrating promising application prospects for ensuring high-quality enterprise development.

[0080] It should be noted that the dilution of deionized water with oily emulsified waste liquid in the stability determination method of oily emulsified waste liquid provided in the embodiments of the present invention is not limited to the volume concentrations of 1%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% involved in the embodiments, and the required volume concentration can be selected in the range of 0 to 100%; it is not limited to preparing oily emulsified waste liquid with different volume concentrations, and can be mass concentration or measurable molar concentration, etc.

[0081] Application Example 1

[0082] Using the stability determination method for oily emulsified wastewater provided in this embodiment of the invention, a stability analysis was performed on a high-oil-content emulsified wastewater obtained from a certain enterprise. The high-oil-content emulsified wastewater had a petroleum content of 1000 mg / L and a Zeta potential of -2 mV. The specific stability determination steps are as follows:

[0083] Step 1: Mix the high-oil-content emulsified waste liquid with deionized water to prepare samples with different volume concentrations: 1%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100%.

[0084] Step 2: Measure the Zeta potential of samples with different volume concentrations, construct a curve showing the relationship between Zeta potential and volume concentration, and obtain the volume concentration C1 at which the absolute value of the Zeta potential is maximum; the curves showing the relationship between Zeta potential and volume concentration for samples with different volume concentrations are as follows: Figure 2 As shown, C1 = 70%;

[0085] Step 3: Measure the surface tension of samples with different volume concentrations. The relationship between surface tension and volume concentration for samples with different volume concentrations is shown in the figure below. Figure 3 As shown; based on the relationship between surface tension and volume concentration, the first derivative of surface tension with volume concentration was obtained, and curves showing the relationship between the first derivative of surface tension and volume concentration and different volume concentrations were plotted to obtain the volume concentration at which the first derivative of surface tension and volume concentration abruptly changes; the curves showing the relationship between the first derivative of surface tension and volume concentration and different volume concentrations are shown in the figure. Figure 4 As shown, there are two mutation points corresponding to volume concentrations of 30% and 70%, so C2 = 30%;

[0086] Step 4: Calculate the ratio R of C1 to C2. R = 2.3, indicating that the system is stable.

[0087] In addition, to further verify the accuracy of the above-mentioned measurement method, a flocculation experiment was conducted on the high-oil-content emulsified wastewater to verify its stability. The specific process is as follows:

[0088] The removal rate of petroleum hydrocarbons was investigated by adding polyaluminum chloride (PAC), a traditional coagulant, at dosages of 100 mg / L, 500 mg / L, and 1000 mg / L. Analysis showed that the removal rates at the three PAC dosages were 20%, 32%, and 50%, respectively. This means that even at a dosage of 1000 mg / L, the petroleum hydrocarbon concentration in the effluent was still as high as 500 mg / L. At this point, the zeta potential of the effluent reached a positive value of 9.5 mV, indicating that the dosage was excessive and separation could not be achieved through flocculation; the oily wastewater remained stable.

[0089] These results indicate that the stability determination method for oil-containing emulsified waste liquid provided in the embodiments of the present invention is effective. The determination method described in the embodiments of the present invention can quickly and effectively analyze and determine actual oil-containing emulsified waste liquid.

[0090] Application Example 2

[0091] Using Daqing crude oil as the oil phase, a certain amount of surfactant sodium dodecyl sulfonate (SDS) or Tween 80 was added, and the mixture was stirred with 0.1 mol / L sodium chloride aqueous solution in a homogenizer at 2000 rpm for 15 min to prepare a series of simulated oil-containing emulsion waste liquids. The stability of this series of simulated oil-containing emulsion waste liquids was determined using the stability determination method for oil-containing emulsion waste liquids provided in this embodiment of the invention. The specific determination steps are as described in Application Example 1 and will not be repeated here. The raw material ratios and stability test results of a series of simulated oil-containing emulsion waste liquids are shown in Table 1, where series 13-15 did not require the addition of surfactant.

[0092] Table 1. Results of raw material ratio and stability tests for a series of simulated oil-containing emulsified waste liquids.

[0093]

[0094]

[0095] As shown in Table 1, the stability of simulated oil-containing emulsified wastewater determined using the method of this invention yielded an R-value of 1.25 for series 13 and 1.5 for series 14, indicating that series 13 and 14 are unstable. Series 15, with a crude oil content of 1500 mg / L, is more stable than series 13 (500 mg / L) and series 14 (100 mg / L), which have lower crude oil contents. This is because the distribution of the oil and water phases is extremely complex, and the higher crude oil content may have contributed to lower surface tension, thus improving the stability of the simulated oil-containing emulsified wastewater. The stability results for series 13–15 also demonstrate that the method of this invention is applicable to the stability analysis of complex oil-containing emulsified wastewater systems.

[0096] To verify the accuracy of the stability test results of this series of simulated oil-containing emulsion waste liquids using the method of this invention, flocculation experiments were conducted on these simulated oil-containing emulsions. The specific experimental verification steps are as described in Application Example 1 and will not be repeated here. The flocculation experiment results of this series of simulated oil-containing emulsions are shown in Table 2. It should be noted that a lower residual petroleum content indicates that petroleum is easily separated from the oil-containing emulsion waste liquid, meaning that the oil-containing emulsion waste liquid is unstable.

[0097] Table 2. Flocculation test results of a series of simulated oil-containing emulsions.

[0098]

[0099]

[0100]

[0101] As shown in Table 2, the simulated oily emulsion wastewater containing surfactants in series 1-12 exhibited low petroleum removal rates and high residual petroleum concentrations. Even with a PAC dosage of 1000 mg / L, the petroleum removal rate remained below 70%, indicating that the oil and aqueous phases in the simulated oily emulsion wastewater were stable, and flocculation methods were insufficient to overcome this stability, demonstrating the high stability of series 1-12. Conversely, series 13 and 14, which did not contain surfactants and exhibited an unstable state, showed residual petroleum concentrations ≤200 mg / L at PAC dosages of 500 mg / L and 1000 mg / L, respectively. Flocculation significantly reduced the residual petroleum concentrations, indicating poor stability in series 13 and 14. These test results not only validated the reliability of using the stability of oily emulsion wastewater proposed in this invention for determining the stability of simulated oily emulsion wastewater, but also demonstrated that the method described in this invention can separate the oil phase by appropriately adding a suitable concentration of coagulant based on the stability of the oily emulsion wastewater, achieving cost savings and improved treatment efficiency.

[0102] In summary, the stability determination method for oily emulsified wastewater provided by this invention has the advantages of being simple and easy to operate. The method of this invention has shown good results when applied to the experimental determination of simulated oily wastewater. The method of this invention also helps to identify the interaction and separation mechanisms of pollutants in complex systems. The stability analysis method for oily emulsified wastewater can also support the optimization and upgrading of existing processes and the development of green technologies, and has the application prospect of ensuring the high-quality development of enterprises.

[0103] Furthermore, in another embodiment of the present invention, a stability testing device for oil-containing emulsified waste liquid is provided, as shown in the schematic diagram of the device. Figure 5 As shown, the device includes an acquisition unit and a determination unit, which are connected together.

[0104] The acquisition unit is used to acquire the Zeta potential of oil-containing emulsion waste liquids of different concentrations and the surface tension and first derivative of the concentration of oil-containing emulsion waste liquids of different concentrations; wherein, the oil-containing emulsion waste liquids of different concentrations are prepared by diluting oil-containing emulsion waste liquids.

[0105] The determination unit is used to determine the stability of oil-containing emulsified waste liquid based on the Zeta potential and first derivative obtained by the acquisition unit.

[0106] The determination unit determines the stability of the oil-containing emulsified waste liquid specifically by including:

[0107] Determine the concentration C1 at which the absolute value of the Zeta potential is maximized;

[0108] Determine the concentration C2 at the point of abrupt change in the first derivative:

[0109] When the first derivative has only one abrupt change point, the concentration corresponding to the abrupt change point is concentration C2; when the first derivative has multiple abrupt change points, the lowest concentration corresponding to the abrupt change point is concentration C2.

[0110] The stability of the oil-containing emulsified waste liquid is determined based on the concentrations C1 and C2.

[0111] The determination unit determines the stability of the oil-containing emulsified waste liquid specifically by including:

[0112] The stability of the oil-containing emulsified waste liquid is determined based on the ratio R of the concentrations C1 and C2.

[0113] Where R = C1 / C2;

[0114] When R≥3, the oil-containing emulsified waste liquid is very stable;

[0115] 1.5≤R<3, oil-containing emulsified waste liquid is stable;

[0116] R < 1.5, indicating that the oil-containing emulsified waste liquid is unstable.

[0117] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for determining the stability of oil-containing emulsified waste liquid, characterized in that, The method includes: The oil-containing emulsified waste liquid was diluted into oil-containing emulsified waste liquids of different concentrations; The zeta potentials of oil-containing emulsified waste liquids of different concentrations were obtained; The surface tension and first derivative of oil-containing emulsified waste liquids with different concentrations were obtained. The stability of oil-containing emulsified waste liquid is determined based on the Zeta potential and the first derivative, specifically including: Determine the concentration C1 at which the absolute value of the Zeta potential is maximized; Determine the concentration C2 at the point of abrupt change in the first derivative; Determining the stability of oil-containing emulsified wastewater based on concentration C1 and / or concentration C2 specifically includes: The stability of the oil-containing emulsified waste liquid is determined based on the ratio R of the concentrations C1 and C2. Where R = C1 / C2; When R≥3, the oil-containing emulsified waste liquid is very stable; 1.5≤R<3, oil-containing emulsified waste liquid is stable; R < 1.5, indicating that the oil-containing emulsified waste liquid is unstable; Determining the concentration C2 specifically includes: Based on the relationship between surface tension and concentration of oily emulsified waste liquids of different concentrations, the first derivative of surface tension with concentration is obtained; When the first derivative has only one abrupt change point, the concentration corresponding to the abrupt change point is concentration C2. When there are multiple abrupt change points in the first derivative, the lowest concentration corresponding to each abrupt change point is concentration C2.

2. The method according to claim 1, characterized in that, The higher the concentration C1, the lower the stability of the oil-containing emulsified waste liquid.

3. The method according to claim 1, characterized in that, The lower the concentration C2, the higher the stability of the oil-containing emulsified waste liquid.

4. The method according to claim 1, characterized in that, The process of diluting the oil-containing emulsified wastewater into oil-containing emulsified wastewater of different concentrations specifically includes: It is prepared by mixing and diluting deionized water with oil-containing emulsified waste liquid, and the volume concentration range of different concentrations of oil-containing emulsified waste liquid is 1-100%.

5. A stability testing device for oil-containing emulsified waste liquid, characterized in that, The device includes an acquisition unit and a determination unit. The acquisition unit is used to acquire the Zeta potential of oil-containing emulsion waste liquids of different concentrations and the surface tension and first derivative of the concentration of oil-containing emulsion waste liquids of different concentrations; wherein, the oil-containing emulsion waste liquids of different concentrations are prepared by diluting oil-containing emulsion waste liquids. A determination unit is used to determine the stability of oil-containing emulsified waste liquid based on the Zeta potential and first derivative obtained by the acquisition unit; The determination unit determines the stability of the oil-containing emulsified waste liquid specifically by including: Determine the concentration C1 at which the absolute value of the Zeta potential is maximized; Determine the concentration C2 at the point of abrupt change in the first derivative; The stability of the oil-containing emulsified waste liquid is determined based on the concentration C1 and / or the concentration C2; The determination unit determines the stability of the oil-containing emulsified waste liquid specifically by including: The stability of the oil-containing emulsified waste liquid is determined based on the ratio R of the concentrations C1 and C2. Where R = C1 / C2; When R≥3, the oil-containing emulsified waste liquid is very stable; 1.5≤R<3, oil-containing emulsified waste liquid is stable; R < 1.5, indicating that the oil-containing emulsified waste liquid is unstable; The determining unit determines the concentration C2 specifically by: Based on the relationship between surface tension and concentration of oily emulsified waste liquids of different concentrations, the first derivative of surface tension with concentration is obtained; When the first derivative has only one abrupt change point, the concentration corresponding to the abrupt change point is concentration C2. When there are multiple abrupt change points in the first derivative, the lowest concentration corresponding to each abrupt change point is concentration C2.

6. The apparatus according to claim 5, characterized in that, The higher the concentration C1 determined by the unit, the lower the stability of the oil-containing emulsified waste liquid.

7. The apparatus according to claim 5, characterized in that, The lower the concentration C2 determined by the unit, the higher the stability of the oil-containing emulsified waste liquid.

8. The apparatus according to claim 5, characterized in that, The volume concentration range of the oil-containing emulsified waste liquid of different concentrations is 1 to 100%.

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