Oil-water separation tank for oily sewage

Abstract

The present application relates to the technical field of oily sewage treatment, in particular to an oil-water separation tank for oily sewage, comprising a tank body and an oil-water separator arranged in the tank body. The tank body is sequentially provided with an inlet groove, a distribution groove, an overflow groove and a water storage groove along the water flow direction, and the oil-water separator is arranged between the inlet groove and the distribution groove and is internally formed by a plurality of partition plates to form a continuous flow channel. The oil-water separator sequentially comprises a horizontal separation section, a twist conversion section and a vertical stratification section, and the partition plates are arranged in a horizontal, inclined or vertical state according to the structure requirements in different sections, so as to guide the oil droplets to gradually gather, float up and realize effective oil-water separation. The present application has compact structure, improves the separation efficiency by using the geometric design of the flow channel, and improves the liquid flow direction to improve the liquid flow rate in the flow channel. It is suitable for the pretreatment or reuse system of oily wastewater in the fields of industry and environmental protection.

Description

Technical Field

[0001] This invention relates to the field of oily wastewater treatment technology, and more specifically to an oil-water separation tank for oily wastewater. Background Technology

[0002] Currently, the direct discharge of large amounts of oily wastewater generated by industries such as metal processing, machinery manufacturing, and petrochemicals would severely pollute the environment and waste precious water resources. In oily wastewater treatment, physical methods are widely used due to their low cost and high efficiency, mainly including oil-water separators, air flotation, centrifugation, and filtration. Oil-water separators utilize the principle of natural flotation based on the density difference between oil and water, suitable for wastewater with larger oil droplets and lower concentrations. However, the equipment is large, requires significant space, and is inefficient at separating fine or emulsified oil droplets. Air flotation releases microbubbles into the water, causing oil droplets to adhere and float. While it can remove emulsified oil droplets, it is energy-intensive and complex to operate and maintain. Centrifugation uses high-speed centrifugal force to accelerate oil-water separation, suitable for high-concentration applications, but it involves high investment and energy consumption, making it unsuitable for treating large-flow, low-concentration wastewater. Filtration relies on filter media to trap oil droplets, suitable for small-flow, fine-treatment, but it is prone to clogging, requires frequent filter media replacement, and has high operating costs. Hydrocyclones are small in size and have no moving parts, and can continuously process large flow rates, but they are sensitive to fluctuations in inlet water pressure and flow rate, and are poor at separating small oil droplets.

[0003] Furthermore, plate coalescing separators promote oil droplet coalescence through inclined plates, requiring no external power, and are smaller in size than oil separators, making maintenance simpler. However, the oil droplets rise in the opposite direction to the water flow, and the droplets must overcome the downward water flow resistance to coalesce and rise, achieving oil-water separation. Therefore, the water velocity is limited (usually <10mm / s), severely restricting the processing capacity. Moreover, high-flow-rate processing requires multiple devices in parallel, leading to system complexity and increased footprint.

[0004] In summary, existing technologies have not yet solved the speed and efficiency bottleneck caused by the opposite movement of oil droplets and water flow in plate coalescing separation. There is an urgent need for a new type of oil-water separation device with a compact structure, oil droplets and water flow in the same direction, and the ability to handle large flow rates. Summary of the Invention

[0005] In view of the above-mentioned shortcomings or defects in the prior art, the present invention provides an oil-water separation tank for oily wastewater, which can efficiently separate oily wastewater into layers and has a higher water flow rate compared with ordinary plate coalescing separators.

[0006] To achieve the above objectives, the present invention provides an oil-water separation tank for oily wastewater, comprising:

[0007] The separation tank, arranged in the direction of water flow, includes, in sequence, an inlet tank, a separator tank, an overflow tank, and a storage tank.

[0008] The liquid inlet tank is connected to the inlet of the oil-water separator, and the outlet of the oil-water separator is connected to the liquid distribution tank.

[0009] The separating tank is equipped with a first floating oil collector at the top of the liquid surface. The lower half of the separating tank is equipped with a water passage hole. The separating tank and the overflow tank are connected through the water passage hole, and the two form a communicating vessel.

[0010] The overflow tank has an overflow outlet at the top, and the water flowing out of the overflow outlet enters the water storage tank.

[0011] A water storage tank, with an outlet located in the lower half of the tank;

[0012] Oil-water separator: An oil-water separator includes a cylindrical outer wall with multiple partition plates inside, forming a flow channel extending from the inlet to the outlet between the partition plates; the oil-water separator includes a horizontal separation section, a torsional reversal section, and a vertical stratification section from the inlet to the outlet.

[0013] The partition plates of the horizontal separation section are set horizontally, and the flow channel is wide in the left and right direction and narrow in the up and down direction;

[0014] The partition plate of the torsion reversal section gradually twists from a horizontal state to a vertical state;

[0015] The vertically layered partitions are set vertically, and the flow channels are narrow in the left and right directions and wide in the up and down directions.

[0016] In some embodiments, the pool body further includes a sedimentation tank, which is located in front of the water storage tank.

[0017] The inlet for oily wastewater is located in the middle of the side wall of the sedimentation tank.

[0018] The bottom of the sedimentation tank is equipped with a sand discharge port.

[0019] A first weir plate is installed at the top of the sedimentation tank. Oily wastewater in the sedimentation tank flows out from the top of the first weir plate and into the inlet tank.

[0020] In some implementations, a second oil float collector is provided at the top of the liquid level in the inlet tank.

[0021] In some embodiments, the first oil float collector is an oil float collection tank, and a second baffle plate is provided at the oil inlet of the oil float collection tank, with the top of the second baffle plate flush with the liquid surface of the liquid separator.

[0022] A third baffle plate is installed at the overflow port at the top of the overflow tank, and the third baffle plate is level with the liquid level in the overflow tank.

[0023] The heights of the first, second, and third weir plates are all adjustable, and the top heights of the three weir plates, from highest to lowest, are the first weir plate, the second weir plate, and the third weir plate.

[0024] In some embodiments, the oil-water separator is inclined, with its outlet end higher than its inlet end.

[0025] The angle between the extension direction of the oil-water separator and the horizontal plane is α, where 5°≤α≤30°.

[0026] In some embodiments, the inlet end of the oil-water separator is connected to the middle part of the side wall of the inlet tank, and the outlet end of the oil-water separator is connected to the upper half of the side wall of the separator.

[0027] The oil-water separator has a detachable filter installed at the inlet.

[0028] The water passage is located below the outlet of the oil-water separator.

[0029] In some embodiments, the pool body further includes an installation groove, in which the oil-water separator is disposed.

[0030] The installation slot contains water, and the water level is higher than the oil-water separator, which is immersed in the water.

[0031] In some embodiments, the mounting groove and the overflow groove are connected by a water inlet pipe, and the mounting groove and the overflow groove constitute a communicating vessel.

[0032] In some embodiments, the oil-facing surface of the separator is made of an oleophilic material.

[0033] In some implementations, the length of the horizontal separation segment is greater than that of the vertical layer segment.

[0034] An oil-water separation tank for oily wastewater using the above-mentioned technical solution of the present invention has the following effects:

[0035] This invention provides a structurally sound oil-water separation tank for oily wastewater, allowing oil droplets and water to move in the same direction, reducing the water flow resistance that causes oil droplets to float. This increases the flow velocity of the liquid within the flow channel. It cleverly integrates the oil-water separator into the tank body, achieving efficient separation and treatment of oily wastewater through the flow channel design and the synergistic effect of each functional section.

[0036] As a core component, the oil-water separator's internal structure is designed to incorporate the physical properties of oil and water. In the horizontal separation section, the horizontally positioned separator plates create flow channels that are wider horizontally and narrower vertically. This allows oil droplets to rise only a short distance before contacting the top of the separator plates and converging to form large oil droplets or oil layers, accelerating the oil-water separation process. In the torsional reversal section, the separator plates gradually twist from a horizontal to a vertical position, and the flow channels also deform from a horizontal to a vertical extension. During this process, oil layers and large oil droplets continuously accumulate upwards along the increasingly inclined lower surface of the separator plates, further promoting oil-water separation. In the vertical stratification section, the vertically positioned separator plates create flow channels that are narrower horizontally and wider vertically, causing oil to accumulate at the top of the channels and water to remain at the bottom, achieving clear oil-water stratification.

[0037] After separation, the oil sludge naturally floats to the top of the separating tank, forming an oil slick. A first oil slick collector at the top of the separating tank easily collects this oil. The water at the bottom flows back to the overflow tank through the water passage and eventually into the water storage tank, from which it is discharged, achieving water recycling. This design not only improves water utilization and reduces water waste but also lowers overall operating costs and is beneficial to environmental protection. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the internal structure of the oil-water separation tank for oily wastewater according to the present invention;

[0039] Figure 2 This is a side view of the oil-water separator in this invention;

[0040] Figure 3 yes Figure 2 A cross-sectional view of the initial section of the middle AA section, i.e. the horizontal separation section, with a portion of it enlarged;

[0041] Figure 4 yes Figure 2 A cross-sectional view of the middle BB, i.e., the end of the horizontal separation section, with a portion of it enlarged;

[0042] Figure 5 yes Figure 2 A cross-sectional view of the initial segment of the CC section, i.e., the torsional reversal segment, with a portion of it enlarged.

[0043] Figure 6 yes Figure 2 A cross-sectional view of the middle section of the DD (mid-section of the torsional reversal segment), with a portion of it enlarged.

[0044] Figure 7 yes Figure 2 The middle section is a cross-sectional view of the end EE of the torsional reversal segment, with a portion of it enlarged.

[0045] Figure 8 yes Figure 2 The cross-sectional view along the middle FF, i.e., the vertically layered section, is enlarged.

[0046] Explanation of reference numerals in the attached figures

[0047] 1-Sedimentation trough, 1a-Sediment discharge outlet, 1b-First retaining dam plate;

[0048] 2-Inlet tank;

[0049] 3-Separation tank;

[0050] 4- Overflow channel;

[0051] 5-Water storage tank;

[0052] 6-Mounting slot;

[0053] 7-Water passage hole;

[0054] 8- Overflow outlet, 8a- Third weir plate;

[0055] 9-Outlet;

[0056] 10-Oil-water separator, 10a-Horizontal separation section, 10b-Twist reversal section, 10c-Vertical stratification section, 10d-Outer wall, 10e-Separation plate;

[0057] 11-First oil spill collector, 11a-Second weir plate;

[0058] 12-Second oil float collector;

[0059] 13-Filter;

[0060] 14-Water pipe. Detailed Implementation

[0061] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0062] In this invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the orientation in the assembled and used state. "Inner" and "outer" refer to the inner and outer sides relative to the outline of each component itself.

[0063] This invention provides an oil-water separation tank for oily wastewater, comprising a tank body and an oil-water separator 10 integrated within the tank body. The technical solution of this invention will be described in detail below with reference to the accompanying drawings.

[0064] Introduction to the pool body

[0065] like Figures 1-8As shown, the oil-water separation tank for oily wastewater of the present invention includes a tank body, which is divided into a sedimentation tank 1, an inlet tank 2, a separation tank 3, an overflow tank 4, and a water storage tank 5 along the water flow direction. Each tank forms a liquid level gradient through the height difference of the baffle plates. The specific structure is as follows:

[0066] Sedimentation tank 1, located at the front end of the tank, is used to remove large particulate solid impurities (such as sand and metal fragments) from oily wastewater. An oily wastewater inlet is located in the middle of its side wall, and a sand discharge port is located at the bottom, allowing for periodic cleaning of sediment via valves. A first weir plate 1b is installed at the top of sedimentation tank 1, through which oily wastewater overflows into the inlet tank 2, preventing solid impurities from entering subsequent treatment units.

[0067] The inlet tank 2 connects to the sedimentation tank 1 and the oil-water separator 10, and is used to temporarily store pre-treated wastewater and complete preliminary oil-water separation. A second oil floater 12 (mechanical skimmer or oil floater) is installed at the top of the inlet tank 2 to collect the surface oil of the pre-separated wastewater in the inlet tank 2. A floating debris collector can also be installed at the top of the inlet tank 2 to clean impurities floating on the water surface in the inlet tank 2.

[0068] The inlet of the oil-water separator 10 is connected to the middle of the side wall of the inlet tank 2. This prevents floating impurities from entering the oil-water separator 10 and causing blockage. Furthermore, the water pressure in the middle of the inlet tank 2 is relatively stable, preventing water overflow from the sedimentation tank 1 from impacting the inlet tank 2. Simultaneously, the inlet is equipped with a removable filter 13 (such as a stainless steel filter screen) to intercept residual fine particulate impurities and further stabilize the water flow entering the oil-water separator 10, reducing water flow disturbance within the separator and maintaining a laminar flow state of the liquid within the oil-water separator 10's flow channels.

[0069] Separating tank 3 is the core area for oil-water separation, receiving the processed liquid from oil-water separator 10. Oil and water are introduced into different areas respectively.

[0070] A first oil float collector 11 is installed at the top of the separating tank 3, and a second adjustable baffle plate 11a is installed at its oil inlet. The top height of the second baffle plate 11a determines the liquid level in the separating tank 3. The lower half of the separating tank 3 has a water passage hole 7, which connects to the overflow tank 4 to form a communicating vessel structure, allowing lower-layer clear water to flow into the overflow tank 4 through the water passage hole 7. The first oil float collector 11 is an oil float collection tank with an adjustable baffle.

[0071] Overflow tank 4 is connected to liquid separator 3 through water passage 7. Its main function is to receive the clean water separated by liquid separator 3 and control the liquid level.

[0072] An overflow port 8 is provided at the top, and a third baffle plate 8a is installed at the overflow port 8. The height of the third baffle plate 8a is lower than that of the second baffle plate 11a of the liquid separating tank 3, forming a liquid level gradient.

[0073] Clean water overflows from overflow port 8 into water storage tank 5. The width of overflow port 8 and the height of the baffle are adjustable to accommodate different flow requirements. The design of overflow tank 4 ensures a stable liquid level and prevents liquid level fluctuations during pumping from affecting the oil-water separation process in separating tank 3.

[0074] The water storage tank 5, located at the end of the pool, is used to store clean water that has undergone multi-stage treatment. Its lower half has an outlet 9, allowing the treated water to be reused or discharged in compliance with standards via pipelines. Directly pumping water from the separating tank 3 requires extremely precise control of both the pumping and inflow rates, easily leading to instability in the liquid level of the separating tank 3 and significant disturbance to the water flow within it. In this invention, the clean water first enters the overflow tank 4, utilizing its own surface gradient to flow into the water storage tank 5 from the overflow outlet 8. Pumping water from the storage tank 5 does not affect the liquid level in the separating tank 3.

[0075] Without considering the density difference between the oil layer and water, and assuming the liquid is still, the liquid levels in the inlet tank 2, the separator tank 3, the overflow tank 4, and the installation tank 6 should be consistent. In this application, the flow force of the liquid comes from the difference in liquid level in different areas of the tank. Therefore, when the oil-water separator is operating normally, the liquid level is: inlet tank 2 > separator tank 3 > overflow tank 4 = installation tank 6. The heights of the weir plates are: first weir plate 1b > second weir plate 11a > third weir plate 8a.

[0076] Introduction to Oil-Water Separator 10

[0077] The oil-water separator 10 is one of the core components of this system, used to separate oil-water mixtures. The oil-water separator 10 mainly consists of a cylindrical outer wall 10d and a partition plate 10e. Depending on their function, the oil-water separator 10 can be divided into a horizontal separation section 10a, a torsional reversal section 10b, and a vertical stratification section 10c from one end to the other.

[0078] The cylindrical outer wall 10d is made of stainless steel, which is corrosion-resistant and high-strength, enabling stable operation for extended periods and resisting corrosion and erosion from oil-water mixtures, thus ensuring the equipment's service life. The front and rear ends of the cylindrical outer wall 10d are the inlet and outlet, respectively.

[0079] One side of the separator 10e (the lower surface of the horizontal separation section 10a, extending to the end of the separator 10e) is made of an oleophilic material or has an oleophilic coating on its surface, such as oleophilic polypropylene fiber. The separator 10e of the horizontal separation section 10a is horizontally arranged, forming a flow channel that is wide from left to right and narrow from top to bottom, so that oil droplets can easily float to the separator 10e and aggregate into an oil layer or large oil droplets.

[0080] The partition plate 10e of the torsion reversing section 10b gradually twists from a horizontal state to a vertical state. The flow channel deforms from a lateral extension to a vertical extension, and the oil layer and large oil droplets accumulate upward along the lower surface of the inclined partition plate 10e.

[0081] The vertically layered section 10c has a vertically set partition plate 10e, forming a flow channel that is narrow on the left and right and wide on the top and bottom. Oil accumulates at the top of the flow channel, while water is located at the bottom.

[0082] The 10e separator spacing is designed to be 10-30mm to ensure that the oil-water mixture flows and separates fully in the flow channel, while avoiding blockage and short-circuiting.

[0083] refer to Figures 3-8 The gap between the partition plates 10e is the flow channel.

[0084] The flow channel of the horizontal separation section 10a is wider left and right and narrower up and down (see attached diagram). Figure 3 , 4 The oil droplets have a short rising distance, allowing them to quickly contact and accumulate with the separator 10e. The torsion reversing section 10b (attached) Figure 5 , 6 The flow channel of section 7) changes with the twisting of the partition plate 10e, causing the oil droplets to continuously accumulate during their ascent. Vertical stratification section 10c (attached) Figure 8 The flow channel is narrow on the left and right sides and wide on the top and bottom, providing clear space for the stratification after oil-water separation, with oil on the top layer and water on the bottom layer.

[0085] In one embodiment of this application, the length of the horizontal separation section 10a is set to be greater than that of the vertical stratification section 10c. This is because the oil-water mixture exhibits different morphologies in the horizontal separation section 10a and the vertical stratification section 10c. In the horizontal separation section 10a, oil sludge is suspended and dispersed in the water as small oil droplets, while in the vertical stratification section 10c, oil droplets mainly exist as large-diameter droplets or oil layers. According to Stokes' law, the radius (r) of an oil droplet is proportional to the square root of its rising velocity (v), meaning that larger oil droplets rise faster.

[0086] Since smaller droplets are less likely to separate into layers with water, the length of the horizontal separation section 10a is set to be greater than that of the vertical stratification section 10c. The longer flow time of the liquid (oil-water mixture) in the horizontal separation section 10a allows small oil droplets to converge at the top of the channel, forming large-diameter oil droplets or an oil layer. Then, in the vertical stratification section 10c, the small oil droplets have formed large-diameter oil droplets or an oil layer. Large-diameter oil droplets rise quickly and easily separate into layers with water. Therefore, the length of the vertical stratification section 10c can be set shorter, i.e., shorter than that of the horizontal separation section 10a.

[0087] The length of the torsional reversing section 10b is determined by the liquid velocity, the Reynolds number of the liquid, and the width of the flow channel, in order to keep the liquid flowing in a laminar state in the torsional reversing section 10b as much as possible.

[0088] like Figure 1 As shown, the oil-water separator 10 is generally horizontally positioned with a certain inclination angle α (α is set to 5°-30°), making the outlet of the oil-water separator 10 slightly higher than its inlet. This facilitates the discharge of the oil layer separated in the vertical separation section 10c from the outlet of the oil-water separator 10. It also prevents impurity deposition and improves the anti-clogging ability of the oil-water separator 10. Because the oil-water separator 10 is inclined upwards, heavier solid deposits are less likely to enter or settle within it. Lighter floating matter also moves more easily upwards with the water flow and flows out of the oil-water separator 10. To further prevent clogging of the oil-water separator 10, a filter 13 can be detachably installed at the inlet end of the oil-water separator 10. The filter 13 prevents larger impurities from entering the oil-water separator 10 and clogging the flow channel. It also stabilizes the water flow, reducing disturbance at the inlet end of the oil-water separator 10, which is beneficial for oil-water separation in the horizontal separation section 10a.

[0089] Installation tank 6 is balanced with water level

[0090] The oil-water separator 10 is fully embedded in the mounting groove 6 of the tank. The mounting groove 6 is filled with water until the water surface completely submerges the oil-water separator 10, using the buoyancy of the water to support the oil-water separator 10. This prevents the flow channel from being deformed due to the weight of the liquid inside the oil-water separator 10. The mounting groove 6 and the overflow groove 4 are connected by a water inlet pipe 14, forming a communicating vessel structure to ensure synchronized water levels.

[0091] This invention significantly improves oil-water separation efficiency through the integrated design of an inclined oil-water separator 10, multi-stage baffle plate level control, and sedimentation tank 1, making it particularly suitable for treating large-flow-rate oily wastewater. The optimized flow channel structure of the oil-water separator 10 ensures that oil droplets move in the same direction as the water flow, reducing the resistance to oil droplet buoyancy and allowing the water flow velocity to increase to 15-20 mm / s, resulting in a processing capacity increase of over 50% compared to traditional plate coalescing separators. Furthermore, the height of the baffle plates can be adjusted to regulate the liquid level difference between the tanks, thereby adjusting the water flow velocity within the flow channel. No additional power is required for the water flow, resulting in low operating costs.

[0092] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0093] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0094] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. An oil-water separation tank for oily wastewater, characterized in that, include: The separation tank, in accordance with the direction of water flow, includes an inlet tank (2), a separation tank (3), an overflow tank (4), and a water storage tank (5); Liquid inlet tank (2) is connected to the inlet of oil-water separator (10), and the outlet of oil-water separator (10) is connected to liquid distribution tank (3); The liquid separator (3) is provided with a first floating oil collector (11) at the top liquid surface of the liquid separator (3). The lower half of the liquid separator (3) is provided with a water passage hole (7). The liquid separator (3) and the overflow tank (4) are connected through the water passage hole (7), and the two constitute a communicating vessel. The overflow tank (4) has an overflow port (8) at the top, and the water flowing out of the overflow port (8) enters the water storage tank (5); Water storage tank (5), with an outlet (9) provided in the lower half of the water storage tank (5); Oil-water separator (10): The oil-water separator (10) includes a cylindrical outer wall (10d), and multiple partition plates (10e) are provided inside the outer wall (10d). A flow channel extending from the inlet to the outlet is formed between the partition plates (10e); the oil-water separator (10) includes a horizontal separation section (10a), a torsional reversal section (10b), and a vertical stratification section (10c) from the inlet to the outlet. The partition plate (10e) of the horizontal separation section (10a) is set horizontally, and the flow channel is wide in the left and right direction and narrow in the up and down direction; The partition plate (10e) of the torsion reversal section (10b) is gradually twisted from a horizontal state to a vertical state; The partition plate (10e) of the vertically layered section (10c) is set vertically, and the flow channel is narrow in the left and right direction and wide in the up and down direction.

2. The oil-water separation tank for oily wastewater according to claim 1, characterized in that, The pool also includes a sedimentation tank (1), which is located in front of the water storage tank (5); The inlet for oily wastewater is located in the middle of the side wall of the sedimentation tank (1); The bottom of the sedimentation tank (1) is equipped with a sand discharge port; A first weir plate (1b) is installed at the top of the sedimentation tank (1); the oily wastewater in the sedimentation tank (1) flows out from the top of the first weir plate (1b) and into the inlet tank (2).

3. The oil-water separation tank for oily wastewater according to claim 2, characterized in that, A second oil float collector (12) is installed at the top of the liquid surface of the liquid inlet tank (2).

4. The oil-water separation tank for oily wastewater according to claim 2, characterized in that, The first oil collector (11) is an oil collection tank. A second baffle plate (11a) is provided at the oil inlet of the oil collection tank. The top of the second baffle plate (11a) is flush with the liquid surface of the liquid separator (3). A third baffle plate (8a) is installed at the overflow port (8) at the top of the overflow tank (4), and the third baffle plate (8a) is flush with the liquid level of the overflow tank (4); The heights of the first weir plate (1b), the second weir plate (11a), and the third weir plate (8a) are all adjustable, and the top heights of the three weir plates are, from highest to lowest, the first weir plate (1b), the second weir plate (11a), and the third weir plate (8a).

5. The oil-water separation tank for oily wastewater according to claim 1, characterized in that, The oil-water separator (10) is inclined, with its outlet end higher than its inlet end; The angle between the extension direction of the oil-water separator (10) and the horizontal plane is α, where 5°≤α≤30°.

6. The oil-water separation tank for oily wastewater according to claim 5, characterized in that, The inlet end of the oil-water separator (10) is connected to the middle part of the side wall of the liquid inlet tank (2), and the outlet end of the oil-water separator (10) is connected to the upper half of the side wall of the liquid separation tank (3). The oil-water separator (10) is detachably equipped with a filter (13) at its inlet end; The water passage (7) is located below the outlet of the oil-water separator (10).

7. The oil-water separation tank for oily wastewater according to claim 1, characterized in that, The pool body also includes an installation groove (6); the oil-water separator (10) is installed in the installation groove (6); The installation groove (6) contains water, and the water level is higher than that of the oil-water separator (10), which is immersed in the water.

8. The oil-water separation tank for oily wastewater according to claim 7, characterized in that, The mounting groove (6) and the overflow groove (4) are connected by a water pipe (14), and the mounting groove (6) and the overflow groove (4) constitute a communicating vessel.

9. The oil-water separation tank for oily wastewater according to claim 1, characterized in that, The surface of the separator (10e) on the oil-facing side is made of an oleophilic material.

10. The oil-water separation tank for oily wastewater according to claim 1, characterized in that, The length of the horizontal separation segment (10a) is greater than that of the vertical layering segment (10c).

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