Wastewater oil separator and wastewater pretreatment apparatus

Abstract

The application relates to the field of chemical wastewater treatment devices, in particular to a wastewater oil separation device and wastewater pretreatment equipment. The wastewater oil separation device comprises an oil separator main body and a separation mechanism; the oil separator main body is provided with a containing cavity, and the oil separator main body is provided with a mixed liquid inlet, an oil phase outlet and a water phase outlet which are communicated with the containing cavity; the separation mechanism comprises a first flow collecting piece and / or a second flow collecting piece; the first flow collecting piece is installed in the containing cavity and located between the mixed liquid inlet and the oil phase outlet; the first flow collecting piece is provided with a plurality of inclined first converging cavities; the inlet of the first converging cavity is opposite to the mixed liquid inlet, and the outlet of the first converging cavity is opposite to the oil phase outlet; the second flow collecting piece is installed in the containing cavity and located between the mixed liquid inlet and the water phase outlet; the second flow collecting piece is provided with a plurality of inclined second converging cavities; the inlet of the second converging cavity is opposite to the mixed liquid inlet, and the outlet of the second converging cavity is opposite to the water phase outlet.

Description

Technical Field

[0001] This application relates to the field of chemical wastewater treatment equipment, and in particular to a wastewater oil separator and wastewater pretreatment equipment. Background Technology

[0002] In the industrial practice of chemical wastewater pretreatment, continuous extraction processes typically employ a continuous operation mode: wastewater and extractant are fed to the extraction reactor in an optimal ratio via a quantitative conveying system. After sufficient mass transfer is achieved through mechanical stirring or a static mixer, the mixture enters a high-efficiency oil-water separation unit to complete two-phase separation. The upper extract phase, rich in pollutants, is transported to the regeneration section for solvent recovery via thermal regeneration in a distillation tower or chemical regeneration using acid or alkali regeneration devices. The regenerated extractant can be recycled back into the wastewater treatment system in a closed loop, forming a highly efficient removal and resource recycling system for characteristic pollutants.

[0003] Given the characteristics of high COD (Chemical Oxygen Demand) and highly toxic wastewater discharged from the chemical industry, current extraction processes need to focus on enhancing the deep removal capabilities of suspended extractants. Traditional oil-water separators generally suffer from technical bottlenecks such as large fluctuations in separation efficiency and long settling times. This not only increases extractant consumption but also leads to higher overall wastewater treatment costs. Utility Model Content

[0004] The purpose of this application is to provide a wastewater oil separation device and a wastewater pretreatment equipment, which can accelerate the wastewater separation rate and reduce the wastewater treatment cost.

[0005] This application provides a wastewater oil separation device, including an oil separator body and a separation mechanism; The oil separator body is provided with a receiving cavity, and the oil separator body is provided with a mixed liquid inlet, an oil phase outlet and a water phase outlet communicating with the receiving cavity; along the height direction of the oil separator body, the oil phase outlet, the mixed liquid inlet and the water phase outlet are arranged sequentially from top to bottom; The separation mechanism includes a first manifold and / or a second manifold; the first manifold is installed in the receiving cavity and is located between the mixture inlet and the oil phase outlet; the first manifold is provided with a plurality of inclined first converging chambers; the inlet of the first converging chamber is opposite to the mixture inlet, and the outlet of the first converging chamber is opposite to the oil phase outlet; the second manifold is installed in the receiving cavity and is located between the mixture inlet and the aqueous phase outlet; the second manifold is provided with a plurality of inclined second converging chambers; the inlet of the second converging chamber is opposite to the mixture inlet, and the outlet of the second converging chamber is opposite to the aqueous phase outlet.

[0006] In the above technical solution, the first converging cavity is a first cavity provided by the first manifold; the length directions of the plurality of first cavities are the same, and the plurality of first cavities are arranged in an array; The second converging cavity is a second cavity provided in the second manifold; the length directions of the multiple second cavities are the same, and the multiple second cavities are arranged in an array.

[0007] In the above technical solution, furthermore, the plurality of first lumens are arranged in a honeycomb pattern; The multiple second lumens are arranged in a honeycomb pattern.

[0008] The above technical solution further includes a mixture distributor; The liquid distributor includes an inlet pipe and a distribution pipe; the inlet pipe passes through the liquid inlet; the distribution pipe has a plurality of first through holes arranged at intervals, the distribution pipe is located in the receiving cavity, and the distribution pipe is connected to the inlet pipe; The inlet of the first manifold is opposite to the plurality of first through holes.

[0009] Furthermore, the above technical solution also includes a baffle plate; the baffle plate is installed at the inlet of the first manifold to confine the mixed liquid output by the mixed liquid distributor to the inlet of the first manifold.

[0010] Furthermore, the above technical solution also includes an oil collection mechanism; The oil collecting mechanism includes an overflow weir and an oil collecting tank, which are located within the receiving cavity; The overflow weir is installed at the outlet of the first manifold; the oil collection tank is located on the side of the overflow weir away from the first manifold, and the oil collection tank is connected to the oil phase outlet.

[0011] In the above technical solution, the oil separator body is further provided with a first level gauge port and a second level gauge port; The height of the first liquid level gauge port is located between the outlet of the first manifold and the crest of the overflow weir, and the first liquid level gauge port is equipped with a first liquid level gauge. The height of the second level gauge port is located in the middle of the second manifold and close to the inlet of the second manifold. The second level gauge port is equipped with a second level gauge.

[0012] Furthermore, the above technical solution also includes a water collection mechanism; The water collection mechanism includes a distribution pipe assembly and a water outlet pipe; The distribution pipe assembly includes a cross-shaped distribution pipe and an annular distribution pipe; the cross-shaped distribution pipe and the annular distribution pipe are installed in the receiving cavity; the cross-shaped distribution pipe is located within the area enclosed by the annular distribution pipe, and the cross-shaped distribution pipe communicates with the annular distribution pipe; the annular distribution pipe has a plurality of second through holes arranged at intervals, and the outlet of the second manifold is opposite to the plurality of second through holes; The water outlet pipe is installed at the water phase outlet and is connected to the cross-shaped distribution pipe.

[0013] In the above technical solution, the bottom of the oil separator body is provided with a drain port, which is connected to the receiving cavity; The top of the oil separator body is provided with an inspection hole, which is connected to the receiving cavity; The top of the oil separator body is provided with an exhaust port, which is connected to the receiving cavity.

[0014] This application also provides a wastewater pretreatment device, including the wastewater oil separator described in the above-mentioned scheme.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: The wastewater oil separation device provided in this application can shorten the floating path of oil droplets and accelerate the separation rate when separating oil droplets. It has a simple structure, stable operation, and good wastewater oil separation effect. This can prevent tar in the wastewater from entering the next stage of wastewater environmental treatment. It can also greatly reduce the loss of extractant during the extraction reaction and reduce the corresponding wastewater treatment cost.

[0016] This application also provides wastewater pretreatment equipment, including the wastewater oil separator described in the above scheme. Based on the above analysis, it is clear that the wastewater pretreatment equipment also has the aforementioned beneficial effects, which will not be elaborated further here. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the wastewater oil separator provided in this application; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point AA; Figure 3 for Figure 1Schematic diagram of the cross-sectional structure at point BB; Figure 4 for Figure 1 A schematic diagram of the cross-sectional structure at point CC.

[0019] In the diagram: 1-Oil separator body; 2-Receiving cavity; 3-Water collection mechanism; 4-Second liquid level gauge port; 5-Second manifold; 6-Mixed liquid inlet; 7-Mixed liquid distributor; 8-First liquid level gauge port; 9-First manifold; 10-Manhole; 11-Exhaust port; 12-Overflow weir; 13-Oil collection tank; 14-Oil phase outlet; 15-Baffle plate; 16-Water outlet pipe; 17-Water phase outlet; 18-Drain port; 19-Liquid inlet pipe; 20-Distribution pipe; 21-Cross distribution pipe; 22-Ring distribution pipe. Detailed Implementation

[0020] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] Example 1 See Figures 1 to 4As shown, the wastewater oil-water separator provided in this application includes an oil separator body 1 and a separation mechanism; the oil separator body 1 is provided with a receiving cavity 2, and the oil separator body 1 is provided with a mixed liquid inlet 6, an oil phase outlet 14 and a water phase outlet 17 communicating with the receiving cavity 2; along the height direction of the oil separator body 1, the oil phase outlet 14, the mixed liquid inlet 6 and the water phase outlet 17 are arranged sequentially from top to bottom.

[0024] The separation mechanism includes a first manifold 9 and / or a second manifold 5; the first manifold 9 is installed in the receiving cavity 2 and is located between the mixed liquid inlet 6 and the oil phase outlet 14; the first manifold 9 is provided with a plurality of inclined first converging chambers; the inlet of the first converging chamber is opposite to the mixed liquid inlet 6, and the outlet of the first converging chamber is opposite to the oil phase outlet 14; the second manifold 5 is installed in the receiving cavity 2 and is located between the mixed liquid inlet 6 and the aqueous phase outlet 17; the second manifold 5 is provided with a plurality of inclined second converging chambers; the inlet of the second converging chamber is opposite to the mixed liquid inlet 6, and the outlet of the second converging chamber is opposite to the aqueous phase outlet 17.

[0025] In practical applications, chemical wastewater can enter the receiving cavity 2 of the oil separator body 1 through the mixed liquid inlet 6. After the oil separator body 1 is loaded with a certain volume of chemical wastewater (oil-containing mixed liquid), because the tar or extractant contained in the mixed liquid itself is already very small, after a long period of accumulation, the small amount of oily substances contained in the aqueous phase will slowly float on the surface of the liquid.

[0026] In existing technologies, in conventional horizontal flow oil separators, oil droplets need to float vertically to the water surface due to density differences (buoyancy). The effective separation depth of the separator is large, and it takes a long time for oil droplets to float to the surface, resulting in low processing efficiency and the need to construct very large separators.

[0027] The shallow pool theory states that if a deep pool is divided into many shallow pools, oil droplets only need to float up a very short vertical distance (such as from a few centimeters to a dozen centimeters) to be "captured", thus greatly shortening the separation time and improving processing efficiency.

[0028] like Figure 1 As shown, the separation mechanism of this application includes a first manifold 9 and a second manifold 5. The first manifold 9 is provided with multiple inclined first converging chambers for capturing and collecting the upper light oil phase. The second manifold 5 is provided with multiple inclined second converging chambers for enhancing the removal of tiny oil droplets in the lower aqueous phase, thereby forming a dual-effect separation system. The first manifold 9 and the second manifold 5 can be made of inclined tubes or inclined plates, which are key components for achieving "shallow pooling." That is, by installing a set of dense, inclined pipes or plates in the pool, a large sedimentation (or flotation) area is divided into multiple independent shallow working units.

[0029] The working process of the separation mechanism is explained in detail below: 1. Water inlet and distribution: Oily wastewater enters the receiving cavity 2 through the mixed liquid inlet 6 and is distributed to the inlet of the collecting cavity (including the first collecting cavity and the second collecting cavity); 2. Upward flow and oil droplet floating: (1) Upward movement (vertical direction): Oil droplets with lower density and light solids begin to move vertically upward under the action of buoyancy; (2) Water flow movement (along the length of the converging cavity): The water flow itself continues to flow downward along the inclined direction of the converging cavity.

[0030] 3. Highly efficient separation: Due to the inclined setting of the converging chamber (the inclination angle is usually between 45° and 60°), the actual floating trajectory of the oil droplet is the result of two motions. As a result, the oil droplet only needs to float up a very short vertical distance before hitting the upper converging chamber wall.

[0031] 4. Gathering and discharge: Oil droplets that collide with the wall of the gathering cavity will adhere to it. Due to the continuous action of hydrophobicity and buoyancy, the oil droplets can slide upward along the wall of the gathering cavity (against the direction of water flow) and flow out from the outlet of the inclined tube cavity, and finally be discharged from the oil phase outlet 14.

[0032] 5. Aqueous phase discharge: After the oil droplets are separated, the relatively clean water continues to flow downward along the converging cavity and flows out from the outlet of the inclined tube cavity, and finally is discharged from the aqueous phase outlet 17.

[0033] The wastewater oil separation device provided in this application can shorten the floating path of oil droplets and accelerate the separation rate when separating oil droplets. It has a simple structure, stable operation, and good wastewater oil separation effect. This can prevent tar in the wastewater from entering the next stage of wastewater environmental treatment. It can also greatly reduce the loss of extractant during the extraction reaction and reduce the corresponding wastewater treatment cost.

[0034] In this embodiment, the first converging cavity is a first cavity provided by the first manifold 9; the length directions of the multiple first cavities are the same, and the multiple first cavities are arranged in an array; the second converging cavity is a second cavity provided by the second manifold 5; the length directions of the multiple second cavities are the same, and the multiple second cavities are arranged in an array.

[0035] In this embodiment, multiple cavities are arranged in parallel array, which can cover a larger cross-sectional area, thereby improving separation efficiency. When the fluid passes through each cavity, it achieves spatially dispersed input or output. At the inlet and outlet of the collecting cavity, it can ensure uniform flow of oily wastewater, improve fluid stability, and achieve large-area uniform liquid distribution and stable liquid collection.

[0036] Specifically, such as Figure 2 and Figure 3As shown, multiple first lumens are arranged in a honeycomb pattern; multiple second lumens are also arranged in a honeycomb pattern. The multiple first and second lumens arranged in a honeycomb pattern are distributed in a hexagonal, tightly packed arrangement, which has a high space utilization rate and structural stability.

[0037] In an optional embodiment, the wastewater oil separator further includes a mixed liquid distributor 7; the mixed liquid distributor 7 includes an inlet pipe 19 and a distribution pipe 20; the inlet pipe 19 passes through the mixed liquid inlet 6; the distribution pipe 20 has a plurality of first through holes arranged at intervals, the distribution pipe 20 is located in the receiving cavity 2, and the distribution pipe 20 is connected to the inlet pipe 19; the inlet of the first manifold 9 is opposite to the plurality of first through holes.

[0038] In this embodiment, such as Figure 3 As shown, the inlet pipe 19 passes through the mixed liquid inlet 6 to introduce wastewater into the receiving cavity 2. The distribution pipe 20 is located inside the receiving cavity 2 and communicates with the inlet pipe 19, forming an intermediate distribution channel. The distribution pipe 20 is in a straight line shape, and multiple first through holes are spaced apart along the length of the distribution pipe 20, which allows the wastewater to flow out evenly at multiple points, significantly expanding the distribution area so that the wastewater can enter multiple cavities, thereby improving the uniformity of the flow field within the entire receiving cavity 2.

[0039] In an optional embodiment, the wastewater oil separator further includes a baffle plate 15. The baffle plate 15 is installed at the inlet of the first manifold 9 to confine the mixed liquid output from the mixed liquid distributor 7 to the inlet of the first manifold 9. The baffle plate 15 forms a physical barrier to limit the flow range of wastewater, prevent wastewater from spreading and leaking, and ensure that all wastewater can enter the inlet of the first manifold 9 without spreading to other areas.

[0040] In an optional embodiment, the wastewater oil separator further includes an oil collection mechanism; the oil collection mechanism includes an overflow weir 12 and an oil collection tank 13, which are located inside the receiving cavity 2; the overflow weir 12 is installed at the outlet of the first confluence member 9; the oil collection tank 13 is located on the side of the overflow weir 12 away from the first confluence member 9, and the oil collection tank 13 is connected to the oil phase outlet 14.

[0041] In this embodiment, the overflow weir 12 is located in the outlet area of ​​the first manifold 9, serving as the interface for liquid level control and oil layer overflow. The oil collection tank 13 is located downstream of the overflow weir 12, used to collect the oil layer that crosses the weir plate and guide it to the oil phase outlet 14. During the static separation process, light oil continuously floats to the surface and accumulates to form an oil layer. When the oil layer thickness increases and the liquid level rises to the top elevation of the overflow weir 12, the oil naturally overflows into the oil collection tank 13. The oil collection tank 13 only receives surface overflow and contains virtually no bottom water phase, thereby achieving oil-water separation and reducing the water content in the discharged oil.

[0042] In an optional embodiment, to monitor the position of the oil-water interface within the containment cavity 2 in real time, the oil separator body 1 is equipped with a first level gauge port 8 and a second level gauge port 4. The height of the first level gauge port 8 is located between the outlet of the first manifold 9 and the crest of the overflow weir 12, and a first level gauge is installed in the first level gauge port 8. The height of the second level gauge port 4 is located in the middle of the second manifold 5 and close to the inlet of the second manifold 5, and a second level gauge is installed in the second level gauge port 4. Specifically, the first and second level gauges are dual-flange level transmitters, capable of detecting the level height of the oil-water interface, so that the user can obtain the position information of the oil-water interface in real time.

[0043] In an optional embodiment, the wastewater oil separator further includes a water collection mechanism 3; the water collection mechanism 3 includes a distribution pipe assembly and an outlet pipe 16; the distribution pipe assembly includes a cross distribution pipe 21 and an annular distribution pipe 22; the cross distribution pipe 21 and the annular distribution pipe 22 are installed in the receiving cavity 2; the cross distribution pipe 21 is located within the area enclosed by the annular distribution pipe 22, and the cross distribution pipe 21 is connected to the annular distribution pipe 22; the annular distribution pipe 22 has a plurality of second through holes arranged at intervals, and the outlet of the second manifold 5 is opposite to the plurality of second through holes; the outlet pipe 16 passes through the water phase outlet 17, and the outlet pipe 16 is connected to the cross distribution pipe 21.

[0044] In this embodiment, such as Figure 4 As shown, the annular distribution pipe 22 is the main water collection pipe, arranged in a ring shape at the bottom of the receiving cavity 2. The annular distribution pipe 22 has multiple second through holes to expand the water collection area, thus allowing it to receive water phases output from multiple second cavities. The cross-shaped distribution pipe 21 is located inside the annular pipe, forming a cross structure, and is used to collect water flow from the annular pipe. The outlet pipe 16 connects to the cross-shaped distribution pipe 21 and passes through the water phase outlet 17, thereby enabling connection to an external drainage system to discharge treated water.

[0045] Example 2 The wastewater oil separator in this second embodiment is an improvement on the above embodiments. The technical content disclosed in the above embodiments will not be described again, and the content disclosed in the above embodiments also belongs to the content disclosed in this second embodiment.

[0046] See Figure 1 As shown, in an optional embodiment, the bottom of the oil separator body 1 is provided with a drain port 18, which is connected to the receiving cavity 2. When the wastewater oil separator needs maintenance or is finished using, the mixed liquid in the oil separator body 1 can be discharged from the drain port 18.

[0047] Optionally, an inspection hole is provided on the top of the oil separator body 1, and the inspection hole communicates with the receiving cavity 2. Specifically, the inspection hole is a manhole 10 opened on the top wall of the oil separator body 1, which can be used for installing and maintaining facilities in the receiving cavity 2.

[0048] Optionally, the top of the oil separator body 1 is provided with an exhaust port 11, which is connected to the receiving cavity 2. The exhaust port 11 is used to discharge excess waste gas generated in the receiving cavity 2 to balance the air pressure inside and outside the oil separator body 1.

[0049] Example 3 Embodiment 3 of this application provides a wastewater pretreatment device, including the wastewater oil separator of any of the above embodiments. Therefore, it has all the beneficial technical effects of the wastewater oil separator of any of the above embodiments, which will not be repeated here.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application. In addition, those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are meant to be within the scope of this application and form different embodiments.

Claims

1. A wastewater oil-water separator, characterized in that, Includes the oil separator body and the separation mechanism; The oil separator body is provided with a receiving cavity, and the oil separator body is provided with a mixed liquid inlet, an oil phase outlet and a water phase outlet communicating with the receiving cavity; along the height direction of the oil separator body, the oil phase outlet, the mixed liquid inlet and the water phase outlet are arranged sequentially from top to bottom; The separation mechanism includes a first manifold and / or a second manifold; the first manifold is installed in the receiving cavity and is located between the mixture inlet and the oil phase outlet; the first manifold is provided with a plurality of inclined first converging chambers; the inlet of the first converging chamber is opposite to the mixture inlet, and the outlet of the first converging chamber is opposite to the oil phase outlet; the second manifold is installed in the receiving cavity and is located between the mixture inlet and the aqueous phase outlet; the second manifold is provided with a plurality of inclined second converging chambers; the inlet of the second converging chamber is opposite to the mixture inlet, and the outlet of the second converging chamber is opposite to the aqueous phase outlet.

2. The wastewater oil separator according to claim 1, characterized in that, The first converging cavity is the first cavity provided in the first manifold; The length directions of the multiple first lumens are the same, and the multiple first lumens are arranged in an array; The second converging cavity is the second cavity provided in the second manifold; The multiple second lumens have the same length direction and are arranged in an array.

3. The wastewater oil separator according to claim 2, characterized in that, The multiple first lumens are arranged in a honeycomb pattern; The multiple second lumens are arranged in a honeycomb pattern.

4. The wastewater oil separator according to claim 1, characterized in that, It also includes a mixture distributor; The liquid distributor includes an inlet pipe and a distribution pipe; the inlet pipe passes through the liquid inlet; the distribution pipe has a plurality of first through holes arranged at intervals, the distribution pipe is located in the receiving cavity, and the distribution pipe is connected to the inlet pipe; The inlet of the first manifold is opposite to the plurality of first through holes.

5. The wastewater oil separator according to claim 4, characterized in that, It also includes a baffle plate; the baffle plate is installed at the inlet of the first manifold to confine the mixture output by the mixture distributor to the inlet of the first manifold.

6. The wastewater oil separator according to claim 1, characterized in that, It also includes oil collection mechanisms; The oil collecting mechanism includes an overflow weir and an oil collecting tank, which are located within the receiving cavity; The overflow weir is installed at the outlet of the first manifold; the oil collection tank is located on the side of the overflow weir away from the first manifold, and the oil collection tank is connected to the oil phase outlet.

7. The wastewater oil separator according to claim 6, characterized in that, The oil separator body is provided with a first liquid level gauge port and a second liquid level gauge port; The height of the first liquid level gauge port is located between the outlet of the first manifold and the crest of the overflow weir, and the first liquid level gauge port is equipped with a first liquid level gauge. The height of the second level gauge port is located in the middle of the second manifold and close to the inlet of the second manifold. The second level gauge port is equipped with a second level gauge.

8. The wastewater oil separator according to claim 1, characterized in that, It also includes water collection mechanisms; The water collection mechanism includes a distribution pipe assembly and a water outlet pipe; The distribution pipe assembly includes a cross-shaped distribution pipe and an annular distribution pipe; the cross-shaped distribution pipe and the annular distribution pipe are installed in the receiving cavity; the cross-shaped distribution pipe is located within the area enclosed by the annular distribution pipe, and the cross-shaped distribution pipe communicates with the annular distribution pipe; the annular distribution pipe has a plurality of second through holes arranged at intervals, and the outlet of the second manifold is opposite to the plurality of second through holes; The water outlet pipe is installed at the water phase outlet and is connected to the cross-shaped distribution pipe.

9. The wastewater oil separator according to claim 1, characterized in that, The bottom of the oil separator body is provided with a drain port, which is connected to the receiving cavity; The top of the oil separator body is provided with an inspection hole, which is connected to the receiving cavity; The top of the oil separator body is provided with an exhaust port, which is connected to the receiving cavity.

10. A wastewater pretreatment device, characterized in that, It includes the wastewater oil separator as described in any one of claims 1 to 9.

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