Oil-water separation equipment and separation method based on sewage treatment

Abstract

The invention relates to the technical field of sewage treatment, in particular to oil-water separation equipment based on sewage treatment and a separation method.The oil-water separation equipment comprises a separation pool, a comb shear type mixing unit used for evenly mixing and injecting sewage and chemicals is arranged in the separation pool, and a separation unit used for scraping an oil layer on the surface of the sewage is arranged at the top of the separation pool; the medicine injection pipe and the liquid injection pipe which coaxially and reversely rotate are adopted, a shearing coupling pair is formed by matching a triangular prism structure of the medicine outlet pipe, crushing edges on the two sides and the liquid outlet pipe, rapid hedging mixing and comb type shearing of a medicine and sewage are synchronously achieved, and compared with a traditional static mixing or single-stage stirring mixing mode, the mixing time is greatly shortened; an emulsified oil film is directly torn through mechanical shearing force to assist demulsification of the agent, so that the problems of agent agglomeration and insufficient oil drop contact are solved, and the oil drop agglomeration efficiency is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to oil-water separation equipment and methods for wastewater treatment. Background Technology

[0002] Oil-water separation in wastewater treatment is a key process for ensuring effluent quality and recovering oil resources. Its core objective is to efficiently separate oily substances in different forms, such as floating oil, dispersed oil, and emulsified oil, from the aqueous phase in wastewater. The treatment effect of this process directly determines the stable operation of subsequent biochemical treatment units and the final effluent meets discharge standards.

[0003] In existing oil-water separation processes, static mixing or single-stage stirring is commonly used to mix reagents and wastewater. However, static mixing relies on the natural diffusion of wastewater and reagents, resulting in a single mixing path, low mass transfer efficiency, and requiring a long residence time to achieve initial mixing. Furthermore, it is more prone to localized reagent enrichment while other areas suffer from insufficient reagent concentration. Single-stage stirring, on the other hand, suffers from poor flow field uniformity, making it difficult to generate high-intensity shearing action. Reagents tend to agglomerate into large particles during stirring, failing to fully contact the dispersed micron-sized emulsified oil droplets in the wastewater. These problems directly lead to poor demulsification, making it difficult to quickly break down the steady state of the oil-water mixture. Numerous tiny oil droplets cannot effectively coagulate, failing to achieve efficient oil-water separation. Furthermore, oil droplet escape can cause substandard effluent quality. Unreacted reagents are also discharged with the effluent, resulting in reagent waste and secondary pollution, ultimately affecting the treatment efficiency and separation effect of oil-water separation.

[0004] To address the aforementioned technical deficiencies, a solution is proposed that employs coaxial, counter-rotating injection and liquid injection pipes. This, combined with the triangular prism structure and two broken edges of the discharge pipe, forms a shear coupling pair with the liquid discharge pipe. This simultaneously achieves rapid flushing and mixing of the agent and wastewater, as well as comb-like shearing. Compared to traditional static mixing or single-stage stirring, this significantly shortens the mixing time. Furthermore, mechanical shearing force directly tears the emulsified oil film, assisting in agent demulsification and resolving issues of agent agglomeration and insufficient oil droplet contact, thus significantly improving oil droplet coagulation efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide an oil-water separation device and method for wastewater treatment to solve the aforementioned technical defects.

[0006] The objective of this invention can be achieved through the following technical solution: Based on an oil-water separation device for wastewater treatment, a separation tank is included. The separation tank contains a comb-type shearing mixing unit for uniformly injecting wastewater and chemicals. A separation unit for scraping off the oil layer on the surface of the wastewater is located at the top of the separation tank. The comb-type shearing mixing unit includes a chemical injection pipe rotatably mounted on one side of the separation tank, and a liquid injection pipe is rotatably connected inside the chemical injection pipe. Multiple chemical outlet pipes are fixedly connected at equal intervals along the circumference and axial direction on the outer wall of the chemical injection pipe. Multiple annularly distributed diversion pipes are fixedly connected to the liquid injection pipe.

[0007] Preferably, the diversion pipe is fixedly connected to each of the two adjacent sets of drug outlet pipes, and several liquid outlet holes are opened on both sides of the liquid outlet pipe. The drug outlet pipe has a triangular prism structure, and several broken edges are fixedly connected at equal intervals along its length on both sides of the drug outlet pipe, and multiple drug outlet holes are opened.

[0008] Preferably, a second bevel gear is fixedly installed on both the injection tube and the drug injection tube, and a transmission rod is rotatably installed on the outer wall of the separation tank, with a first bevel gear fixedly connected to the transmission rod and meshing with the second bevel gear.

[0009] Preferably, an annular drug inlet shell is rotatably mounted on the drug injection tube, and a drug inlet communicating with the annular drug inlet shell is provided on the drug injection tube. A drug inlet tube is fixedly connected to the annular drug inlet shell, and a liquid inlet tube is connected to the injection tube through a rotary joint.

[0010] Preferably, a conical filter funnel is fixedly connected to one inner wall of the separation tank and rotatably connected to the injection pipe. The conical filter funnel is made of polypropylene material and coated with a hydrophilic coating. A drain pipe communicating with the inside of the conical filter funnel is fixedly connected to the separation tank, and the drain pipe has a geometric structure. A cleaning brush that slides against the conical filter funnel is fixedly connected to the outer wall of the injection pipe.

[0011] Preferably, a semi-circular baffle is fixedly connected to the side of the separation tank away from the conical filter bucket, and a flow guide block is fixedly connected to the inner wall of the separation tank above the conical filter bucket, and multiple flow-blocking strips are fixedly connected at equal intervals on the bottom inclined surface of the flow guide block.

[0012] Preferably, the separation unit includes an oil drain hopper fixedly connected to the top of the separation tank on the side away from the guide block. Rotating rods are fixedly connected inside both the separation tank and the oil drain hopper, and two sets of chains are arranged between the rotating rods. Several elastic oil scrapers are installed at equal intervals between the chains.

[0013] Preferably, the bottom of the oil drain hopper has a human-shaped structure with low sides and high middle, and an oil scraper is fixedly connected inside the oil drain hopper.

[0014] Preferably, a sprocket that meshes with the corresponding chain is fixedly connected to the rotating rod, and a motor that drives the corresponding rotating rod to rotate is installed on the separation tank by bolts. A pulley is fixedly installed on both a set of rotating rods and transmission rods, and the pulleys are connected by belt drive.

[0015] This invention also proposes an oil-water separation method for wastewater treatment, comprising the following steps:

[0016] Step 1: Wastewater flows through the inlet pipe, injection pipe, and diversion pipe to multiple outlet pipes, and is sprayed into the mixing zone through the outlet holes. Demulsifier flows through the inlet pipe, annular inlet shell, and injection pipe to multiple outlet pipes, and is sprayed from the outlet holes toward the liquid pipes, achieving preliminary mixing of the agent and wastewater.

[0017] Step 2: The motor drives the rotating rod, which in turn drives the transmission rod to rotate via pulleys and belts. Through the meshing of bevel gears, the injection tube and the liquid injection tube rotate synchronously in opposite directions. The breaking edge of the drug outlet tube and the liquid outlet tube form a shear coupling pair, which performs comb-like shearing on the mixture, mechanically tears the emulsified oil film, strengthens the contact between the drug and the oil droplets, and promotes the coagulation of the oil droplets.

[0018] Step 3: The mixture surges upward from below the semi-circular baffle. The aqueous phase enters the conical filter through capillary guidance and is automatically discharged through several types of drain pipes to maintain the liquid level in the separation tank. The oil phase cannot pass through the conical filter and floats to the surface. The injection pipe carries a cleaning brush to clean the oil phase on the surface of the conical filter and assist the oil phase to float.

[0019] Step 4: The floating oil phase forms an oil layer on the surface of the mixture. The rotating rod drives the elastic scraper to move through the sprocket and chain, pushing the oil layer to the oil discharge hopper for discharge. During the upward movement of the elastic scraper, it contacts the degreasing scraper to scrape off the residual oil layer on the plate.

[0020] The beneficial effects of this invention are as follows:

[0021] (1) This invention uses a coaxially rotating injection tube and liquid injection tube, combined with the triangular prism structure of the discharge tube and the broken edges on both sides to form a shear coupling pair with the liquid discharge tube, to achieve rapid preliminary mixing of the agent and sewage and to perform toothed comb shearing treatment on the sewage. Compared with the existing static mixing or single-stage stirring mixing mode, it significantly shortens the mixing time of the agent and sewage. Furthermore, it directly tears the emulsified oil film through mechanical shearing force, assisting the agent to quickly break the steady state of oil-water mixing. At the same time, the agent flow direction and the sewage spraying direction form a countercurrent, further enhancing the sufficiency of the two-phase contact, effectively solving the problems of agent agglomeration and insufficient contact with oil droplets in the traditional process, significantly improving the coagulation efficiency of small oil droplets, and laying the foundation for subsequent oil-water separation.

[0022] (2) This invention utilizes the capillary guiding effect of the hydrophilic coated conical filter bucket to achieve directional permeation of the aqueous phase and efficient interception of the oil phase. Combined with the self-balancing of the liquid level of several types of drain pipes, it achieves automatic discharge of oily wastewater. At the same time, the cleaning brush linked to the injection pipe can clean the oil phase attached to the surface of the filter bucket in real time, avoiding filter bucket blockage and resulting in a decrease in separation efficiency. The chain-type elastic oil scraper at the top works in synergy with the oil scraper in the oil discharge bucket to achieve rapid scraping and automatic discharge of the oil layer on the liquid surface, and also to complete the online self-cleaning of the elastic oil scraper, ensuring long-term stable operation of the equipment, achieving deep separation of emulsified oil and floating oil, and improving the quality of effluent and the oil phase recovery effect. Attached Figure Description

[0023] The invention will now be further described with reference to the accompanying drawings;

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the internal structure of the separation tank of the present invention;

[0026] Figure 3 This is a schematic diagram of the separation tank of the present invention;

[0027] Figure 4 This is a schematic diagram of the separation unit of the present invention;

[0028] Figure 5 This is a schematic diagram of the injection tube structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the drug injection tube of the present invention;

[0030] Figure 7 This is a schematic diagram of the linkage between the injection tube and the drug injection tube of the present invention.

[0031] Legend:

[0032] 1. Separation tank; 11. Transmission rod; 12. Bevel gear one; 13. Conical filter funnel; 14. Drain pipe; 15. Semi-circular baffle; 16. Guide block; 17. Flow barrier strip;

[0033] 2. Toothed comb shearing mixing unit; 21. Injection tube; 22. Liquid injection tube; 23. Discharge tube; 24. Diverter tube; 25. Liquid discharge tube; 26. Crushing ridge; 27. Bevel gear II; 28. Annular inlet shell; 29. ​​Inlet; 210. Inlet tube; 211. Rotary joint; 212. Liquid inlet tube; 213. Cleaning brush;

[0034] 3. Separation unit; 31. Oil drain hopper; 32. Rotating rod; 33. Chain; 34. Elastic oil scraper; 35. Oil removal scraper; 36. Sprocket; 37. Motor. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1: Please refer to Figures 1-3 and Figures 5-7 As shown, existing technologies suffer from poor demulsification effects, difficulty in rapidly disrupting the steady state of oil-water mixtures, and the inability of numerous tiny oil droplets to effectively coagulate. This results in neither efficient oil-water separation nor adequate effluent quality due to oil droplet escape. The following solutions can address these issues:

[0037] This embodiment is based on an oil-water separation device for sewage treatment, including a separation tank 1. The separation tank 1 is equipped with a toothed shear mixing unit 2 for mixing sewage and chemicals. The top of the separation tank 1 is equipped with a separation unit 3 for scraping the oil layer on the surface of the sewage. The toothed shear mixing unit 2 includes a chemical injection pipe 21 rotatably installed on one side of the separation tank 1, and a liquid injection pipe 22 is rotatably connected inside the chemical injection pipe 21. Both ends of the liquid injection pipe 22 pass through the chemical injection pipe 21 for the installation of the two-sided diversion pipes 24 and the rotary joint 211. Multiple chemical outlet pipes 23 are fixedly connected to the outer wall of the chemical injection pipe 21 at equal intervals along its circumference and axial direction. Multiple diversion pipes 24 distributed in a ring are fixedly connected to the liquid injection pipe 22.

[0038] The diversion pipe 24 is fixedly connected to the liquid outlet pipe 25 between the two adjacent sets of liquid outlet pipes 23, and the liquid outlet pipe 25 has several liquid outlet holes on both sides. The liquid outlet pipe 23 has a triangular prism structure, which enables the sewage to flow rapidly on both sides of the liquid outlet pipe 23 during rotation. The liquid outlet pipe 23 has several breaking ridges 26 fixedly at equal intervals along its length on both sides, and has multiple liquid outlet holes. The sewage is dispersed and sprayed into the separation tank 1 through the multiple liquid outlet holes on the liquid outlet pipe 25. The agent used to break the oil film in the sewage is sprayed out towards the liquid outlet pipes 25 on both sides through the multiple liquid outlet holes on the liquid outlet pipe 23, thereby completing the rapid preliminary mixing treatment of the agent and the sewage.

[0039] By synchronously rotating the injection tube 21 and the liquid injection tube 22 in opposite directions, combined with the toothed comb structure formed by multiple liquid outlet tubes 25 and the diversion tube 24, and the shear coupling pair formed by multiple injection tubes 23 with triangular prism structure and multiple liquid outlet tubes 25 with broken edges 26 on both sides, the sprayed sewage is subjected to toothed comb shearing treatment, which improves the mixing effect of the agent and sewage, while mechanically tearing the emulsified oil film in the sewage, further ensuring sufficient contact between the agent and oil droplets in the mixing area, and breaking the steady state of oil-water mixing;

[0040] At the same time, the flow direction of the reagent is opposite to the direction of the sewage spray, which further enhances the sufficiency of the two-phase contact, effectively solves the problems of reagent agglomeration and insufficient contact with oil droplets in traditional processes, significantly improves the coagulation efficiency of tiny oil droplets, lays the foundation for subsequent oil-water separation, and improves the subsequent separation efficiency.

[0041] Both the injection tube 22 and the drug injection tube 21 are fixedly installed with bevel gear 27. A transmission rod 11 is rotatably installed on the outer wall of the separation tank 1, and a bevel gear 12 that meshes with the bevel gear 27 is fixedly connected to the transmission rod 11. The bevel gear 12 is located between the two sets of bevel gear 27. During the rotation of the transmission rod 11, the drug injection tube 21 and the injection tube 22 rotate synchronously in opposite directions through the meshing of the bevel gear 12 with the two sets of bevel gear 27.

[0042] An annular inlet shell 28 is rotatably mounted on the injection tube 21, and an inlet 29 communicating with the annular inlet shell 28 is provided on the injection tube 21. An inlet tube 210 is fixedly connected to the annular inlet shell 28. By cooperating with the annular inlet shell 28, the inlet 29 and the inlet tube 210, the medicine is injected into the rotating injection tube 21, thereby realizing the rotational spraying of the medicine over a wide area.

[0043] The injection pipe 22 is connected to the inlet pipe 212 via a rotary joint 211. Through the rotary joint 211 and the inlet pipe 212, sewage is injected into the rotating injection pipe 22, thereby achieving a large-scale rotary spraying of sewage. Combined with the rotary spraying of the agent, the two are quickly mixed.

[0044] A conical filter 13, which is rotatably connected to the injection tube 21, is fixedly connected to one inner wall of the separation tank 1. The conical filter 13 is made of polypropylene material and coated with a hydrophilic coating. The aqueous phase in the mixture enters the interior of the conical filter 13 through the capillary flow formed by the tiny channels of the conical filter 13. The oil phase cannot float through the hydrophilic coating on the surface of the conical filter 13, thus achieving directional permeation of the aqueous phase and efficient interception of the oil phase.

[0045] A drain pipe 14 is fixedly connected to the separation tank 1 and communicates with the inside of the conical filter 13. The drain pipe 14 has a geometric structure. A cleaning brush 213 that slides against the conical filter 13 is fixedly connected to the outer wall of the injection pipe 21. The de-oiled wastewater enters the geometric drain pipe 14 and the liquid level is equal to the liquid level in the separation tank 1 until the liquid level is located in the horizontal section above the drain pipe 14. This achieves automatic discharge of excess de-oiled wastewater and automatically maintains the liquid level inside the separation tank 1.

[0046] The rotation of the cleaning brush 213 carried by the injection tube 21 can clean the oil phase on the surface of the conical filter 13, helping the oil phase to detach from the conical filter 13 and float to the surface, thus avoiding clogging of the conical filter 13 and resulting in a decrease in separation efficiency.

[0047] Example 2: Please refer to Figures 1-4 As shown, the problem of efficient oil-water separation in a mixture can be solved by the following solutions:

[0048] In this embodiment, a semi-circular baffle 15 is fixedly connected to the side of the separation tank 1 away from the conical filter 13. A mixing area is formed between the bottom of the separation tank 1 and the semi-circular baffle 15. The reagent and sewage are first injected into the mixing area for efficient mixing treatment. A guide block 16 is fixedly connected to the inner wall of the separation tank 1 and above the conical filter 13. The top of the guide block 16 has an arc-shaped structure, and its bottom has an inclined structure. Multiple flow-blocking strips 17 are fixedly connected at equal intervals on the inclined surface of the bottom of the guide block 16.

[0049] The mixture in the mixing zone is discharged from the free side of the semi-circular baffle 15. It first contacts the conical filter 13 and, combined with its conical structure, assists in the partial separation of the surface oil phase. Then, it surges upward. The guide block 16 guides the upward-flowing mixture to move horizontally, avoiding excessive sloshing of the liquid surface, which could lead to the subsequent oil-scraping separation and the discharge of some water. In addition, the elastic scraper 34 is used to push all the floating oil layers while contacting the liquid surface, improving the scraping efficiency and effect. The flow-blocking strip 17 is used to continuously reduce the impact of the upward-flowing mixture.

[0050] The separation unit 3 includes an oil discharge hopper 31 fixedly connected to the top of the separation tank 1 on the side away from the guide block 16. Rotating rods 32 are fixedly connected inside the separation tank 1 and the oil discharge hopper 31. Two sets of chains 33 are arranged between the rotating rods 32. Several elastic oil scrapers 34 are installed at equal intervals between the chains 33. The multiple elastic oil scrapers 34 are located below the rotating rods 32 and continuously move towards the oil discharge hopper 31. The elastic oil scrapers 34 push the oil layer to move and push it into the oil discharge hopper 31 to separate it from the sewage.

[0051] The bottom of the oil drain hopper 31 has a human-shaped structure with low sides and high center. After the elastic oil scraper 34 pushes the oil layer into the oil drain hopper 31, the human-shaped structure with low sides and high center causes the elastic oil scraper 34 to deform. First, it lifts the oil layer and separates it from the sewage below. Then, it pushes the oil layer downward to slide out and avoids pushing the sewage out at the same time. An oil removal scraper 35 is fixedly connected inside the oil drain hopper 31. During the upward rotation of the elastic oil scraper 34 from inside the oil drain hopper 31, its pushing side contacts the oil removal scraper 35, thereby completing the removal of the oil layer on the pushing side of the elastic oil scraper 34.

[0052] A sprocket 36 that meshes with the corresponding chain 33 is fixedly connected to the rotating rod 32. A motor 37 that drives the corresponding rotating rod 32 to rotate is installed on the separation tank 1 by bolts. A pulley is fixedly installed on one set of rotating rods 32 and transmission rods 11. The pulleys are connected by belt drive. The motor 37 drives the corresponding rotating rod 32 to rotate. The rotating rod 32 cooperates with the chain 33 through the sprocket 36 to drive multiple elastic oil scraper plates 34 to move. In addition, the rotating rod 32, together with the pulley and belt, drives the transmission rod 11 to rotate.

[0053] Example 3: Please refer to Figures 1-7 As shown, the present invention also proposes an oil-water separation method for wastewater treatment, comprising the following steps:

[0054] Step 1: Wastewater is sequentially injected into multiple outlet pipes 25 through inlet pipe 212, rotary joint 211, injection pipe 22, and multiple diversion pipes 24. Then, it is dispersed and sprayed out through multiple outlet holes on the outlet pipes 25 to the mixing area formed between the bottom of the separation tank 1 and the semi-circular partition 15. The agent used to break the oil film in the wastewater is sequentially injected into multiple outlet pipes 23 through inlet pipe 210, annular inlet shell 28, inlet port 29, and injection pipe 21. Then, it is sprayed out through multiple outlet holes towards the outlet pipes 25 on both sides, thereby completing the rapid preliminary mixing treatment of the agent and wastewater in the mixing area.

[0055] Step 2: The motor 37 drives the corresponding rotating rod 32 to rotate. The rotating rod 32, in conjunction with the pulley and belt, drives the transmission rod 11 to rotate. The transmission rod 11, through the meshing bevel gear 12 and bevel gear 27, causes the injection tube 21 and the liquid injection tube 22 to rotate synchronously in opposite directions. Through the shear coupling pair formed by multiple drug outlet tubes 23 and multiple liquid outlet tubes 25 with a triangular prism structure and broken edges 26 on both sides, the sprayed wastewater is subjected to comb-like shearing treatment. This improves the mixing effect of the agent and wastewater, while mechanically tearing the emulsified oil film in the wastewater. This further ensures sufficient contact between the agent and oil droplets in the mixing area, breaks down the steady state of oil-water mixing, promotes the coagulation of tiny oil droplets, and improves the subsequent separation efficiency.

[0056] Step 3: The mixed wastewater is discharged from the mixing area below the semi-circular baffle 15 and rises. During this process, the water phase in the mixture enters the interior of the conical filter 13 through the capillary flow formed by the tiny channels of the conical filter 13. The oil phase cannot pass through the conical filter 13 and floats up. The de-oiled wastewater enters the hexagonal drain pipe 14, and the liquid level is equal to the liquid level in the separation tank 1 until the liquid level is located in the horizontal section above the drain pipe 14, thereby realizing the automatic discharge of excess de-oiled wastewater and automatically maintaining the liquid level in the separation tank 1. Through the rotation of the cleaning brush 213 carried by the injection pipe 21, the oil phase on the surface of the conical filter 13 can be cleaned and treated, and the oil phase is detached from the conical filter 13 and floats up.

[0057] Step 4: The oil phase rises to the surface of the mixture at the top of the semi-circular partition 15 and mixes to form an oil layer. Through the cooperation of the rotating rod 32, sprocket 36 and chain 33, multiple elastic oil scrapers 34 located below the rotating rod 32 continuously move towards the oil discharge hopper 31. The elastic oil scrapers 34 push the oil layer to move and push it into the oil discharge hopper 31. Combined with the human-shaped structure of the bottom of the oil discharge hopper 31, which is low on both sides and high in the middle, the oil is automatically discharged from the separation tank 1. During the upward rotation of the elastic oil scraper 34 from the inside of the oil discharge hopper 31, its oil-pushing side contacts the oil removal scraper 35, thereby completing the removal of the oil layer on the oil-pushing side of the elastic oil scraper 34.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. Oil-water separation equipment based on sewage treatment, comprising a separation tank (1), characterized in that, The inside of the separation tank (1) is provided with a tooth comb shearing type mixing unit (2) for mixing injection of sewage and medicament, the top of the separation tank (1) is provided with a separation unit (3) for scraping the oil layer on the surface of the sewage, the tooth comb shearing type mixing unit (2) comprises a medicine injection pipe (21) rotatably installed on one side of the separation tank (1), a liquid injection pipe (22) is rotatably connected in the medicine injection pipe (21), a plurality of medicine outlet pipes (23) are fixedly and communicatively arranged on the outer wall of the medicine injection pipe (21) at equal distances in the circumferential direction and the axial direction, and a plurality of shunt pipes (24) are fixedly and communicatively arranged on the liquid injection pipe (22) in an annular distribution.

2. The oil-water separation apparatus for sewage treatment according to claim 1, wherein A liquid outlet pipe (25) is fixedly and communicatively arranged on the shunt pipe (24) between adjacent two groups of medicine outlet pipes (23), a plurality of liquid outlet holes are formed in the two sides of the liquid outlet pipe (25), the medicine outlet pipe (23) has a triangular prism structure, a plurality of breaking edges (26) are fixedly and integrally arranged on the two sides of the medicine outlet pipe (23) at equal distances in the length direction, and a plurality of medicine outlet holes are formed.

3. The oil-water separation apparatus for sewage treatment according to claim 1, wherein A bevel gear two (27) is fixedly and integrally arranged on the liquid injection pipe (22) and the medicine injection pipe (21), a transmission rod (11) is rotatably arranged on the outer wall of the separation tank (1), and a bevel gear one (12) engaged with the bevel gear two (27) is fixedly connected to the transmission rod (11).

4. The oil-water separation apparatus for sewage treatment according to claim 1, wherein A ring-shaped medicine inlet shell (28) is rotatably arranged on the medicine injection pipe (21), a medicine inlet (29) is formed in the medicine injection pipe (21) and communicates with the ring-shaped medicine inlet shell (28), and a medicine inlet pipe (210) is fixedly and communicatively arranged on the ring-shaped medicine inlet shell (28).

5. The oil-water separation apparatus for sewage treatment according to claim 3, wherein A conical filter (13) rotatably connected with the medicine injection pipe (21) is fixedly and integrally arranged on the inner wall of one side of the separation tank (1), the conical filter (13) is made of polypropylene material and coated with a hydrophilic coating on the surface, a liquid discharge pipe (14) fixedly and integrally arranged on the separation tank (1) and communicating with the inside of the conical filter (13) has a few-shaped structure, and a cleaning brush (213) fixedly and integrally arranged on the outer wall of the medicine injection pipe (21) slidably abuts against the conical filter (13).

6. The oil-water separation apparatus for sewage treatment according to claim 5, wherein A semicircular partition (15) is fixedly and integrally arranged on the side of the separation tank (1) away from the conical filter (13), a flow guide block (16) is fixedly and integrally arranged on the inner wall of the separation tank (1) above the conical filter (13), and a plurality of flow resistance strips (17) are fixedly and integrally arranged on the inclined surface of the bottom of the flow guide block (16) at equal distances.

7. The oil-water separation apparatus for sewage treatment according to claim 5, wherein The separation unit (3) comprises an oil discharge hopper (31) fixedly and integrally arranged on the top of one side of the separation tank (1) away from the flow guide block (16), and the inside of the separation tank (1) and the oil discharge hopper (31) are fixedly and integrally provided with a rotating rod (32), two groups of chains (33) are arranged between the rotating rods (32), and a plurality of elastic oil scraping plates (34) are mounted at equal distances between the chains (33).

8. The oil-water separation apparatus for sewage treatment according to claim 7, wherein The bottom of the oil discharge hopper (31) has a human-shaped structure with low sides and high middle part, and an oil removal scraper (35) is fixedly and integrally arranged in the inside of the oil discharge hopper (31).

9. The oil-water separation apparatus for sewage treatment according to claim 7, wherein The rotating rod (32) is fixedly connected with a sprocket (36) engaged with a corresponding chain (33), and the separation tank (1) is provided with a motor (37) for driving the corresponding rotating rod (32) to rotate by bolt mounting, and a belt wheel is fixedly mounted on each of the rotating rod (32) and the transmission rod (11), and the belt wheels are connected by a belt transmission.

10. An oil-water separation method based on sewage treatment, which uses the oil-water separation apparatus based on sewage treatment according to any one of claims 1 to 9, characterized by, The method comprises the following steps: Step one: sewage is injected into multiple liquid outlet pipes (25) through the liquid inlet pipe (212), the liquid injection pipe (22), and the shunt pipe (24), and is sprayed into the mixing area through the liquid outlet holes, the demulsifying agent is injected into multiple medicine outlet pipes (23) through the medicine inlet pipe (210), the annular medicine inlet shell (28), and the medicine injection pipe (21), and is sprayed in the direction of the liquid pipe (25) through the medicine outlet holes, so as to realize the preliminary mixing of the agent and the sewage; Step two: the motor (37) drives the rotating rod (32) to rotate, drives the transmission rod (11) to rotate through the belt wheel and the belt, and drives the medicine injection pipe (21) and the liquid injection pipe (22) to rotate in opposite directions through the bevel gear engagement, so that the broken edges (26) of the medicine outlet pipe (23) and the liquid outlet pipe (25) form a shearing coupling pair, the mixed liquid is subjected to tooth comb shearing, the emulsion film is mechanically torn, the contact between the agent and the oil droplets is strengthened, and the oil droplets are promoted to coagulate; Step three: the mixed liquid flows upwards from below the semicircular partition plate (15), the water phase enters the hopper through the capillary flow of the conical filter (13), is automatically discharged through the several type liquid outlet pipe (14), and maintains the liquid level in the separation tank (1), the oil phase cannot pass through the conical filter (13) and floats upwards, the medicine injection pipe (21) carries the cleaning brush (213) to clean the oil phase on the surface of the conical filter (13), and the oil phase is assisted to float upwards; Step four: the floating oil phase forms an oil layer on the liquid surface of the mixed liquid, the rotating rod (32) drives the elastic oil scraping plate (34) to move through the sprocket (36) and the chain (33), pushes the oil layer to the oil discharge hopper (31) and discharges the oil layer, and the elastic oil scraping plate (34) moves upwards, and the residual oil layer on the elastic oil scraping plate (34) is scraped off by the oil removal scraper (35).

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