Sewage treatment device and treatment process

Abstract

The present invention relates to the technical field of sewage treatment, and specifically discloses a sewage treatment device and a treatment process, including an oil removal tank, wherein the oil removal tank includes an inlet pipe, an outlet pipe and a tank body, wherein the inlet pipe and the outlet pipe are arranged on two opposite sides of the tank body; an oil separation device, wherein a plurality of oil separation devices are installed at the upper end of the oil removal tank from the inlet pipe to the outlet pipe, and the lower side of the oil separation device is located inside the oil removal tank, and part of the oil separation device is located in the sewage, wherein the oil separation device includes a low-temperature pipe, a driving component, a collecting mechanism, a roller and a telescopic component, wherein the oil shell is caused to fall off and enter into a discharge component by vibrating a liquid bag by the telescopic component, and then the oil shell is discharged from the tank body through the discharge component, and the present invention is conducive to the separation of oil in sewage.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a sewage treatment device and a treatment process. Background Art

[0002] Domestic sewage is wastewater discharged from residents' daily lives, which contains a large amount of oil. The main reason for degreasing domestic sewage is to protect the environment and the sustainable use of water resources. Oil substances in sewage can have serious impacts on aquatic ecosystems, such as reducing the dissolved oxygen content of water bodies, affecting the survival of aquatic organisms, and may cause eutrophication of water bodies. In addition, oil substances can also have adverse effects on the normal operation of sewage treatment facilities, increase treatment costs and difficulties. Therefore, degreasing is an important step in the domestic sewage treatment process, which helps to reduce pollution to the environment and ensure that the discharged water quality meets environmental protection standards.

[0003] A Chinese patent application document with publication number CN116514345A discloses a domestic sewage treatment device and method, including: a deoiling tank, a grease treatment device, a UASB reactor and an electrolytic reactor. The deoiling tank includes an inlet pipe, an outlet pipe and a tank body, and the inlet pipe and the outlet pipe are arranged on opposite sides of the tank body. When the grease treatment device is working, it is necessary to first push the grease filter plate into the sewage, and then blow cold air to the surface of the sewage. After the grease in the sewage solidifies and floats on the surface of the sewage, the grease filter plate is lifted up, so that the grease filter plate separates the solidified grease from the sewage, and then the grease on the grease filter plate is scraped outward by a scraper to achieve the separation of grease and water.

[0004] In the above technology, cold air is blown onto the surface of the sewage to solidify the grease. However, since there is no seal around it, the cold air will be lost to the outside, resulting in a low utilization rate of the cold air. In addition, when a scraper is used to scrape the grease on the grease filter plate, the solidified grease is soft and may be blocked in the mesh of the grease filter plate, and the grease may even be squeezed down through the grease filter plate into the sewage. Summary of the invention

[0005] The present invention provides a sewage treatment device, aiming to solve the problem in the related art that when a scraper is used to scrape grease off a grease filter plate, the solidified grease is relatively soft and may cause the grease to be blocked on the mesh of the grease filter plate or pass through the grease filter plate and re-enter the sewage.

[0006] A sewage treatment device of the present invention comprises an oil removal tank and further comprises:

[0007] An oil-waste separation device, wherein multiple oil-waste separation devices are installed at the upper end of the de-oiling tank, and the bottom of the oil-waste separation device is immersed in the de-oiling tank and contacts the sewage. The oil-waste separation device comprises a low-temperature pipe, a driving component, a collecting mechanism, a roller and a telescopic component. The low-temperature pipe is passed through the tank body, and multiple rotating joints are arranged along the axial direction of the low-temperature pipe. A first condensing medium for cooling the collecting mechanism flows in the low-temperature pipe. The roller is sleeved on the low-temperature pipe, and the driving component is arranged on the tank body and used to drive the roller to rotate. The collecting mechanism is arranged along the circumferential direction of the roller. The collecting mechanism comprises a liquid capsule and a sealing component. When the roller rotates, the oil in the sewage adheres to the surface of the liquid capsule to form an oil shell. The telescopic component is located inside the roller and is used to drive the liquid capsule to vibrate along the radial direction of the roller.

[0008] The discharge assembly is arranged at one side of the oil separation device and is used to collect the oil shell after the liquid capsule is broken.

[0009] The effect is that by setting up an oil separation device, the oil in the sewage is attached to the surface of the oil separation device through low temperature, and the oil shell on the surface of the liquid capsule is separated by a subsequent scraper, thereby separating the grease in the sewage.

[0010] Preferably, the sealing component includes a second connecting pipe and a bottom plate, the bottom plate is installed on the drum, the liquid capsule is fixedly installed on the bottom plate, and the inner concave surface of the liquid capsule and the bottom plate form a cavity, the cavity is filled with a second condensing medium for cooling the liquid capsule, the second connecting pipe is located on the side of the bottom plate away from the liquid capsule, and the second condensing medium can flow out of the liquid capsule along the second connecting pipe.

[0011] The effect is that by connecting the multiple liquid capsules to each other, the second condensing medium can be located in the lower liquid capsule, thereby improving the utilization efficiency of the second condensing medium.

[0012] Preferably, a plurality of drainage holes and breaking rods are provided on the bottom plate, sliding holes are opened at both ends of the bottom plate, two rotating shafts are installed at the drainage holes, breaking rods are installed on the rotating shafts, and a torsion spring is provided between the breaking rods and the rotating shafts to keep the ends of the two breaking rods away from the bottom plate away from each other, so that the second condensing medium can flow into the drainage hole, and the second connecting pipe is connected to the drainage hole.

[0013] Preferably, the liquid capsule includes a counterweight rod, a first connecting plate, a second connecting plate, a liquid capsule frame and a third connecting plate, the liquid capsule frame is installed on the bottom plate, the third connecting plate is arranged on the liquid capsule frame, the first connecting plate, the second connecting plate and the third connecting plate are made of flexible material, the second connecting plate is arranged at one end of the two third connecting plates close to each other, the first connecting plate is arranged between the two second connecting plates, the first connecting plate, the second connecting plate and the third connecting plate form a recessed portion recessed toward the bottom plate, the counterweight rod is arranged on the first connecting plate, and when the counterweight rod descends toward the bottom plate, it squeezes the bottom end of the breaking rod and pushes the top ends of the two breaking rods close to each other.

[0014] The effect is that the breaking rod can squeeze the liquid sac from the inside of the liquid sac, thereby breaking the oil shell attached to the surface of the liquid sac.

[0015] Preferably, a folding section is provided between the first connecting plate and the third connecting plate, and between the second connecting plate and the third connecting plate, the folding section is a wave-shaped structure, the first connecting plate is connected to the third connecting plate through the folding section, and the second connecting plate is connected to the third connecting plate through the folding section.

[0016] The effect is that the oil shell can be embedded in the folding section through the provided folding section, thereby preventing the oil shell from falling off when it is located at the lower side of the drum.

[0017] Preferably, the telescopic assembly includes a connecting frame, a limit plate and a limit block, the connecting frame is arranged on the base plate, the connecting frame is provided with a mounting hole for installing the counterweight rod, the connecting frame is slidably fitted on the base plate along the radial direction of the roller, the two limit blocks are respectively installed at both ends of the connecting frame, the limit plate is provided with a limit slide groove, the limit block is slidably fitted in the limit slide groove, and when the limit block slides along the limit slide groove, the connecting frame and the liquid bag are driven to vibrate along the radial direction of the roller.

[0018] Preferably, the discharge assembly includes a collecting bin, a discharge port, a discharge motor and a discharge auger. The collecting bin is installed on the pool body, the discharge port is opened at one end of the collecting bin, the discharge auger rotates and cooperates in the collecting bin, the discharge motor is connected to the discharge auger, and is used to drive the discharge auger to discharge the oil shell in the collecting bin through the discharge port.

[0019] The effect is that the oil shell on the surface of the liquid sac is discharged from the de-oiling tank through the discharge component.

[0020] Preferably, the low-temperature pipe includes a rotary joint, a cooler, a limiting pipe opening and a first connecting pipe. The cooler is arranged in the low-temperature pipe, and the rotary joint is arranged on the cooler. The cooler is used to connect two second connecting pipes relatively arranged on the drum for the circulation of the second condensing medium, and the rotary joint is installed on the outside of the limiting pipe opening. A plurality of first connecting pipes are arranged on the rotary joint.

[0021] On the other hand, the present invention further provides a sewage treatment process, wherein the sewage treatment process uses a sewage treatment device described in any one of the above preferred technical solutions, and the method for using the sewage treatment device comprises the following steps:

[0022] S1. Sewage is introduced into the pool from the water inlet pipe;

[0023] S2, introducing a first condensing medium into the low-temperature pipe from one end to cool the collecting mechanism, so that the oil in the sewage adheres to the liquid capsule to form an oil shell;

[0024] S3, start the driving assembly to drive the drum to rotate, so that the telescopic assembly crushes the oil shells on the collecting mechanism and discharges them into the discharge assembly, and at the same time starts the discharge assembly to discharge the oil shells to the outside through the discharge assembly;

[0025] S4. Discharge the sewage in the pool from the outlet pipe.

[0026] The effect is that the grease and water in the sewage are separated by low temperature, and the oil shell is discharged from the de-oiling tank through the discharge component.

[0027] By adopting the above technical solution, the beneficial effects of the present invention are:

[0028] 1. The first condensing medium is introduced into the low-temperature pipeline to cool the collecting mechanism, and then the driving component drives the drum to rotate. The collecting mechanism on the circumferential surface of the drum will enter the sewage in turn. The oil in the sewage contacts the collecting mechanism and the temperature is lowered, so it will condense on the surface of the collecting mechanism to form an oil shell. Finally, the condensed oil is taken out of the sewage under the rotation of the drum to achieve the effect of oil-water separation.

[0029] 2. A breaking rod is arranged inside the collecting mechanism. When the collecting mechanism rotates upward, the breaking rod will break the oil shell attached to the surface of the liquid sac into small pieces to prevent the oil shell from being stuck in the collecting bin and unable to be discharged.

[0030] 3. A folding section is provided on the surface of the liquid sac, so that the friction between the oil shell and the liquid sac is increased, thereby preventing the oil shell on the surface of the liquid sac from falling off when the collecting mechanism comes out of the sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0032] Figure 2 It is a schematic diagram of the three-dimensional structure of the oil removal pool of the present invention.

[0033] Figure 3 It is a three-dimensional structural schematic diagram of the oil separation device and the discharge assembly of the present invention.

[0034] Figure 4 It is an exploded view of the oil separation device of the present invention.

[0035] Figure 5 It is a three-dimensional structural schematic diagram of the closing component and the connecting frame of the present invention.

[0036] Figure 6 It is a structural schematic diagram of the telescopic assembly of the present invention.

[0037] Figure 7 It is a three-dimensional cross-sectional view of the liquid capsule and the bottom plate of the present invention.

[0038] Figure 8 It is a three-dimensional cross-sectional view of the cryogenic pipeline of the present invention.

[0039] Fig. 9 It is a schematic diagram of the three-dimensional structure of the discharge assembly of the present invention.

[0040] Reference numerals:

[0041] 1. Oil removal tank; 11. Water inlet pipe; 12. Water outlet pipe; 13. Tank body; 14. Driving motor; 15. Support column; 2. Oil separation device; 21. Low temperature pipe; 211. Rotary joint; 212. Cooler; 213. Position limiting pipe opening; 214. First connecting pipe; 22. Driving assembly; 23. Collecting mechanism; 231. Liquid capsule; 2311. Counterweight rod; 2312. First connecting plate; 2313. Second connecting plate; 2314. Liquid capsule rack; 2315. Third Connecting plate; 232, closing component; 233, second connecting pipe; 234, bottom plate; 235, drainage hole; 236, breaking rod; 24, roller; 25, telescopic component; 251, connecting frame; 252, limiting plate; 2521, first arc segment; 2522, second arc segment; 2523, wave segment; 2524, connecting segment; 253, limiting block; 3, discharging component; 31, collecting bin; 32, discharging port; 33, discharging motor; 34, discharging auger; 4, sewage sedimentation tank. DETAILED DESCRIPTION

[0042] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0043] like Figure 1-Figure 3As shown, the sewage treatment device of the present invention includes a de-oiling tank 1 and a sewage sedimentation tank 4. The tank body 13 of the de-oiling tank 1 is a rectangular parallelepiped, and an inlet pipe 11 and an outlet pipe 12 are arranged on the left and right sides of the tank body 13. One end of the outlet pipe 12 is located in the de-oiling tank 1, and the other end is located above the sewage sedimentation tank 4. The sewage is first subjected to oil separation treatment in the de-oiling tank 1 and then enters the sewage sedimentation tank 4. A dosing device is arranged outside the sewage sedimentation tank 4 for adding drugs to the sewage sedimentation tank 4, so as to flocculate and precipitate impurities in the sewage.

[0044] like Figure 1-Figure 4 As shown, a plurality of oil separation devices 2 are installed along the length direction of the pool body 13. The oil separation device 2 includes a low-temperature pipe 21, a driving assembly 22, a collecting mechanism 23, a roller 24 and a telescopic assembly 25. The oil separation device 2 is used to cool and solidify the oil in the sewage, thereby separating the oil and water in the sewage.

[0045] like Figure 1-Figure 4 As shown, the support columns 15 are divided into two rows and arranged along the length direction of the pool body 13, and the two rows of support columns 15 are respectively located on both sides of the pool body 13, and the two ends of the low-temperature pipe 21 are respectively fixedly installed on the upper ends of the support columns 15 on both sides. A driving motor 14 is arranged at the top of the supporting column 15. The driving component 22 is a gear, which is installed at both ends of the roller 24. The output end of the driving motor 14 is meshed with the gear, and the two ends of the roller 24 are respectively rotatably installed on the front and rear side surfaces of the pool body 13.

[0046] like Figure 4-Figure 7 As shown, the collecting mechanism 23 includes a liquid capsule 231 and a closing component 232, the liquid capsule 231 includes a counterweight rod 2311, a first connecting plate 2312, a second connecting plate 2313, a liquid capsule frame 2314 and a third connecting plate 2315, wherein the third connecting plate 2315 is installed on the liquid capsule frame 2314, the second connecting plate 2313 is connected to one end of the two third connecting plates 2315 close to each other, the first connecting plate 2312 is arranged between the two second connecting plates 2313, the first connecting plate 2312 and the third connecting plate 2315, and the second connecting plate 2313 and the third connecting plate 2315 are all connected by a folding section, the folding section is a wavy structure, which can make the oil shell also form a wavy structure when attached to the folding section, and then form a lock with the folding section, so that the oil shell is not easy to fall off, and the first connecting plate 2312, the second connecting plate 2313 and the third connecting plate 2315 are made of flexible material.

[0047] like Figure 4-Figure 7As shown, the closing component 232 includes a bottom plate 234 and a plurality of second connecting pipes 233 arranged on the inner side of the bottom plate 234, the second connecting pipes 233 are connected to the first connecting pipe 214, a plurality of drainage holes 235 are opened on the bottom plate 234, two rotating shafts are installed in the drainage holes 235, the two rotating shafts are located on both sides of the center of the drainage holes 235 and are symmetrically arranged, a breaking rod 236 is rotatably installed on the rotating shaft, a torsion spring is arranged between the breaking rod 236 and the rotating shaft, one end of the breaking rod 236 is located in the drainage hole 235, and the other end of the breaking rod 236 is connected to a cross plate, the cross plate has a plurality of protrusions, and the protrusions on the two opposite breaking rods 236 are relatively staggered, and the two cross plates are far away from each other in the initial state.

[0048] like Figure 4-Figure 7 As shown, the telescopic assembly 25 includes a connecting frame 251, a limiting plate 252 and a limiting block 253. The connecting frame 251 is composed of a long rod and two short rods. The two short rods are respectively located at the two ends of the long rod and are perpendicular to the long rod. Both ends of the bottom plate 234 are provided with sliding holes that pass through the inside and outside thereof. The short rods are slidably mounted on the bottom plate 234 through the sliding holes. A plurality of mounting holes for mounting the counterweight rod 2311 are provided on the long rod. Two limiting blocks 253 are installed on the short rods at both ends. The limiting blocks 253 are provided on the two ends of the short rods. The limiting slide groove 252 includes a first arc segment 2521, a second arc segment 2522, a fluctuating segment 2523 and a connecting segment 2524. The first arc segment 2521 and the second arc segment 2522 are coaxial with the central axis of the limiting plate 252 and are arranged opposite to each other. The first arc segment 2521 is located on the side of the second arc segment 2522 away from the central axis of the limiting plate 252. One end of the connecting segment 2524 is connected to the first arc segment 2521. The first circular arc segment 2521 is connected to the second circular arc segment 2522, and the other section is connected to the second circular arc segment 2522. One end of the undulating section 2523 is connected to the end of the first circular arc segment 2521 away from the connecting section 2524, and the other section is connected to the end of the second circular arc segment 2522 away from the connecting section 2524. When the stop block 253 slides from the first circular arc segment 2521 to the second circular arc segment 2522, it drives the connecting frame 251 and the liquid capsule 231 to shrink inward along the radial direction of the roller 24, so that the oil shell attached to the liquid capsule 231 falls into the liquid capsule. When the limit block 253 slides from the second arc segment 2522 to the undulating segment 2523 in the groove formed by the inward depression of 231, the connecting frame 251 and the liquid capsule 231 will be driven to protrude outward along the radial direction of the roller 24, and the oil shell will be thrown out from the liquid capsule 231 into the discharge assembly 3. When the limit block 253 slides in the undulating segment 2523, the liquid capsule 231 will be driven to return from the outward protrusion to the initial state. This process is repeated many times to further throw out the oil shell on the liquid capsule 231.

[0049] like Figure 1-Figure 5As shown, a plurality of rotary joints 211 rotatably mounted with the cryogenic pipe 21 are arranged along the axial direction of the cryogenic pipe 21, a plurality of first connecting pipes 214 are arranged at equal intervals on the circumferential surface of the rotary joint 211, the roller 24 is sleeved on the cryogenic pipe 21, the rotary joint 211 is located between the two end surfaces of the roller 24, the limit plate 252 is fixedly mounted on the cryogenic pipe 21, two circular tubes are arranged on the outer sides of the circular surfaces at both ends of the roller 24, a plurality of long grooves arranged along the length direction of the roller 24 are opened at equal intervals on the circumferential surface of the roller 24, and the number of the long grooves is the same as the number of the collecting mechanism 23, the gears are fixedly mounted on the circular tubes, the bottom plate 234 is fixedly mounted in the long grooves, and the concave surface of the liquid capsule 231 is fixedly mounted on the side of the bottom plate 234 with the breaking rod 236.

[0050] like Figure 4-Figure 8 As shown, a plurality of limiting pipe openings 213 corresponding to the first connecting pipes 214 are provided along the axial direction of the low-temperature pipe 21, and the limiting pipe openings 213 penetrate along the radial direction of the low-temperature pipe 21. A cooler 212 is installed inside the low-temperature pipe 21. The input end and the output end of the cooler 212 are respectively connected to the two limiting pipe openings 213 on the low-temperature pipe 21. The two limiting pipe openings 213 can be simultaneously connected to the two first connecting pipes 214 located in the same radial direction. At this time, the two collecting mechanisms 23 relatively arranged on the drum 24 are in a connected state, and the second condensing medium can enter the cavity of the lower collecting mechanism 23 from the cavity of the upper collecting mechanism 23.

[0051] like Figure 2-Figure 9 As shown, the discharge assembly 3 includes a collecting bin 31, a discharge port 32, a discharge motor 33 and a discharge auger 34. The discharge assembly 3 is located on the right side of the oil separation device 2 and is arranged in a set. The collecting bin 31 of the discharge assembly 3 fits the outer cylindrical surface of the collecting mechanism 23. The discharge ports 32 at both ends of the discharge assembly 3 are respectively fixedly mounted on the two long sides of the tank body 13. The collecting bin 31 is fixedly mounted on the tank body 13. The discharge auger 34 is mounted at the bottom of the collecting bin 31. The output end of the discharge motor 33 is connected to the discharge auger 34, which is used to drive the discharge auger 34 to discharge the oil shells in the collecting bin 31 through the discharge port 32.

[0052] The specific working principle is as follows: first, sewage is introduced into the pool body 13 through the water inlet pipe 11, and then the first condensing medium is introduced into one end of the low-temperature pipe 21, and the driving motor 14 and the discharge motor 33 are started. After the driving motor 14 is started, it will drive the drum 24 to rotate. When one of the collecting mechanisms 23 on the drum 24 enters the sewage, the first condensing medium cools the collecting mechanism 23, which will reduce the temperature of the liquid capsule 231 on the collecting mechanism 23. The oil in the sewage will solidify due to the low temperature to form an oil shell of the same shape as the surface of the liquid capsule 231. When the drum 24 continues to rotate, the collecting mechanism 23 with the oil shell attached to the surface rotates to the top. At this time, the telescopic component 25 inside the collecting mechanism 23 will drive the liquid capsule 231 to sink inward. At this time, due to the second connecting plate 2313 moves inward, and the oil shell will be sunken along with the liquid capsule 231 and then broken. At the same time, the oil shell will be broken again under the squeezing action of the breaking rod 236. When the liquid capsule 231 is sunken inward, the second connecting pipe 233 of this collecting mechanism 23 will rotate to be connected with the cooler 212 on the low-temperature pipe 21. At this time, the second condensing medium inside it will enter the collecting mechanism 23 on the opposite side through the cooler 212. Then, as the roller 24 continues to rotate, after the collecting mechanism 23 rotates to the top of the collecting bin 31, the telescopic assembly 25 will drive the liquid capsule 231 to protrude outward and then retract, and repeat this process many times. At this time, the oil shell will fall from the collecting mechanism 23 into the collecting bin 31. As the discharging auger 34 rotates, the oil shell will be discharged outside the pool body 13, thereby achieving the effect of oil-water separation.

[0053] According to the sewage treatment device of the embodiment of the present invention, the sewage treatment process thereof comprises the following steps:

[0054] S1. First, sewage is introduced into the tank body 13 through the water inlet pipe 11.

[0055] S2. A first condensing medium is introduced into one end of the low-temperature pipe 21. When sewage enters one of the collecting mechanisms 23 on the drum 24, the temperature of the liquid capsule 231 on the collecting mechanism 23 is reduced due to the cooling of the inside of the collecting mechanism 23 by the first condensing medium. The oil in the sewage will solidify due to the low temperature to form an oil shell of the same shape as the surface of the liquid capsule 231.

[0056] S3, start the drive motor 14 and the discharge motor 33. After the drive motor 14 is started, it will drive the drum 24 to rotate. When the drum 24 rotates, the collecting mechanism 23 with the oil shell attached to the surface rotates to the upper side. At this time, the telescopic component 25 inside the collecting mechanism 23 will drive the liquid capsule 231 to sink inward. At this time, due to the inward movement of the second connecting plate 2313, the oil shell will sink along with the liquid capsule 231 and then break. At the same time, the oil shell will break again under the squeezing action of the breaking rod 236. After the collecting mechanism 23 rotates to the top of the collecting bin 31, the telescopic component 25 will drive the liquid capsule 231 to bulge outward and then retract, and repeat this process many times. At this time, the oil shell will fall from the collecting mechanism 23 into the collecting bin 31. As the discharge auger 34 rotates, the oil shell will be discharged outside the pool body 13.

[0057] S4. The sewage in the tank body 13 is discharged from the outlet pipe 12.

[0058] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A sewage treatment device, comprising an oil removal tank, characterized in that: Also includes: An oil-waste separation device, wherein multiple oil-waste separation devices are installed at the upper end of the de-oiling tank, and the bottom of the oil-waste separation device is immersed in the de-oiling tank and contacts the sewage. The oil-waste separation device comprises a low-temperature pipe, a driving component, a collecting mechanism, a roller and a telescopic component. The low-temperature pipe is passed through the tank body, and multiple rotating joints are arranged along the axial direction of the low-temperature pipe. A first condensing medium for cooling the collecting mechanism flows in the low-temperature pipe. The roller is sleeved on the low-temperature pipe, and the driving component is arranged on the tank body and used to drive the roller to rotate. The collecting mechanism is arranged along the circumferential direction of the roller. The collecting mechanism comprises a liquid capsule and a sealing component. When the roller rotates, the oil in the sewage adheres to the surface of the liquid capsule to form an oil shell. The telescopic component is located inside the roller and is used to drive the liquid capsule to vibrate along the radial direction of the roller. A discharge assembly, which is arranged at one side of the oil-pollution separation device and is used to collect the oil shell after the liquid capsule is broken; The sealing component comprises a second connecting pipe and a bottom plate, the bottom plate is mounted on the drum, the liquid capsule is fixedly mounted on the bottom plate, and the inner concave surface of the liquid capsule and the bottom plate form a cavity, in which a second condensing medium for cooling the liquid capsule is contained.

2. A sewage treatment device according to claim 1, characterized in that: The second connecting pipe is located at a side of the bottom plate facing away from the liquid bag, and the second condensation medium can flow out of the liquid bag along the second connecting pipe.

3. A sewage treatment device according to claim 2, characterized in that: A plurality of drainage holes and breaking rods are provided on the bottom plate, sliding holes are provided at both ends of the bottom plate, two rotating shafts are installed at the drainage holes, breaking rods are installed on the rotating shafts, and a torsion spring is provided between the breaking rods and the rotating shafts to keep the ends of the two breaking rods away from the bottom plate away from each other, so that the second condensing medium can flow into the drainage hole, and the second connecting pipe is connected to the drainage hole.

4. A sewage treatment device according to claim 3, characterized in that: The liquid bag includes a counterweight rod, a first connecting plate, a second connecting plate, a liquid bag frame and a third connecting plate. The liquid bag frame is installed on the bottom plate, and the third connecting plate is arranged on the liquid bag frame. The first connecting plate, the second connecting plate and the third connecting plate are made of flexible material. The second connecting plate is arranged at one end of two third connecting plates close to each other. The first connecting plate is arranged between the two second connecting plates. The first connecting plate, the second connecting plate and the third connecting plate form a recessed portion recessed toward the bottom plate. The counterweight rod is arranged on the first connecting plate. When the counterweight rod descends toward the bottom plate, it squeezes the bottom end of the breaking rod and pushes the top ends of the two breaking rods close to each other.

5. A sewage treatment device according to claim 4, characterized in that: A folding section is provided between the first connecting plate and the third connecting plate, and between the second connecting plate and the third connecting plate. The folding section is a wave-shaped structure. The first connecting plate is connected to the third connecting plate through the folding section, and the second connecting plate is connected to the third connecting plate through the folding section.

6. A sewage treatment device according to claim 4, characterized in that: The telescopic assembly includes a connecting frame, a limit plate and a limit block. The connecting frame is arranged on the base plate. The connecting frame is provided with a mounting hole for installing a counterweight rod. The connecting frame slides and fits on the base plate along the radial direction of the roller. The two limit blocks are respectively installed at both ends of the connecting frame. The limit plate is provided with a limit slide groove. The limit block slides and fits in the limit slide groove. When the limit block slides along the limit slide groove, the connecting frame and the liquid bag are driven to vibrate along the radial direction of the roller.

7. A sewage treatment device according to claim 6, characterized in that: The limiting slide groove includes a first arc segment, a second arc segment, a fluctuating segment and a connecting segment. The first arc segment and the second arc segment are coaxial with the central axis of the limiting disk and are arranged opposite to each other. The first arc segment is located on the side of the second arc segment away from the central axis of the limiting disk. One end of the connecting segment is connected with the first arc segment, and the other end is connected with the second arc segment. One end of the fluctuating segment is connected with an end of the first arc segment away from the connecting segment, and the other end is connected with an end of the second arc segment away from the connecting segment. When the limiting block slides in the first arc segment, the connecting segment, the fluctuating segment and the second arc segment, it drives the connecting frame and the liquid bag to vibrate along the radial direction of the roller.

8. A sewage treatment device according to claim 1, characterized in that: The discharge assembly includes a collecting bin, a discharge port, a discharge motor and a discharge auger. The collecting bin is installed on the pool body. The discharge port is opened at one end of the collecting bin. The discharge auger rotates and cooperates in the collecting bin. The discharge motor is connected to the discharge auger and is used to drive the discharge auger to discharge the oil shells in the collecting bin through the discharge port.

9. A sewage treatment device according to claim 1, characterized in that: The low-temperature pipeline includes a rotary joint, a cooler, a limiting pipeline opening and a first connecting pipeline. The cooler is arranged in the low-temperature pipeline, and the rotary joint is arranged on the cooler. The cooler is used to connect two second connecting pipelines arranged opposite to each other on the drum for the circulation of the second condensing medium, and the rotary joint is installed on the outside of the limiting pipeline opening. A plurality of first connecting pipelines are arranged on the rotary joint.

10. A sewage treatment process, characterized in that: A sewage treatment device according to any one of claims 1 to 9 is used, comprising the following steps: S1. Let sewage flow into the pool from the water inlet pipe; S2, introducing a first condensing medium into the low-temperature pipe from one end to cool the collecting mechanism, so that the oil in the sewage adheres to the liquid capsule to form an oil shell; S3, start the driving assembly to drive the drum to rotate, so that the telescopic assembly crushes the oil shells on the collecting mechanism and discharges them into the discharge assembly, and at the same time starts the discharge assembly to discharge the oil shells to the outside through the discharge assembly; S4. Discharge the sewage in the pool from the outlet pipe.

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