Machining shop wastewater treatment system

Abstract

The present application relates to machining workshop wastewater treatment system, including sedimentation tank, filter tank, oil removal tank, electro-catalytic oxidation tank, anaerobic treatment tank, aerobic treatment tank and clean water tank, the sedimentation tank is provided with wastewater delivery pipe, the wastewater delivery pipe is provided with demulsifier adding mechanism; The upper part side wall of the sedimentation tank is provided with oil drain pipe, the oil drain pipe is connected with the oil collecting tank, the bottom of the sedimentation tank is provided with first deslagging mechanism;The middle part of the sedimentation tank is connected with the filter tank, and the filter assembly is arranged in the filter tank;Filter tank, oil removal tank, electro-catalytic oxidation tank, anaerobic treatment tank, aerobic treatment tank and clean water tank are sequentially connected, the oil removal tank is provided with oil absorption assembly, the electro-catalytic oxidation tank is provided with negative electrode and positive electrode, and the bottom of the electro-catalytic oxidation tank is provided with ozone inlet. The system is used for treating machining workshop wastewater, most of the pollutants in the wastewater are fully removed, the water quality meets the relevant discharge standard, and can be directly discharged or reused.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and in particular to a wastewater treatment system for a machining workshop. Background Technology

[0002] Machine shops generate various types of wastewater during production, such as oily wastewater, acidic / alkaline wastewater, and organic wastewater. Oily wastewater mainly originates from lubrication, cooling, and transmission systems during machining, as well as wastewater generated during parts cleaning. Acidic / alkaline wastewater comes from surface treatment processes, such as pickling and phosphating. Organic wastewater may come from painting processes or the use of other organic solvents. Machine shop wastewater is characterized by high oil content, high levels of metal particles and metal ions; direct discharge will severely pollute the environment. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a wastewater treatment system for machining workshops, which can purify the wastewater in machining workshops so that the water quality meets the discharge standards.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows: a wastewater treatment system for a machining workshop, including a sedimentation tank, a filter tank, an oil removal tank, an electrocatalytic oxidation tank, an anaerobic treatment tank, an aerobic treatment tank, and a clean water tank. The sedimentation tank is equipped with a wastewater conveying pipe, and a demulsifier adding mechanism is installed on the wastewater conveying pipe. An oil discharge pipe is installed on the upper side wall of the sedimentation tank, and the oil discharge pipe is connected to an oil collection tank. A first slag discharge mechanism is installed at the bottom of the sedimentation tank. The middle part of the sedimentation tank is connected to the filter tank, and a filter assembly is installed inside the filter tank. The filter tank, oil removal tank, electrocatalytic oxidation tank, anaerobic treatment tank, aerobic treatment tank, and clean water tank are connected in sequence. An oil suction assembly is installed inside the oil removal tank, and a negative electrode and a positive electrode are installed inside the electrocatalytic oxidation tank. An ozone inlet is installed at the bottom of the electrocatalytic oxidation tank.

[0005] Furthermore, a separation cylinder is provided at the center of the oil collecting tank, and a separation chamber is provided between the separation cylinder and the oil collecting tank. The bottom of the inner cavity of the separation cylinder is connected to the bottom of the separation chamber. A calcium oxide adding mechanism is provided above the separation chamber. A second slag discharge mechanism is provided at the bottom of the separation chamber and is connected to the wastewater conveying pipe. An oil discharge mechanism is provided at the top of the inner cavity of the separation cylinder. The oil discharge pipe is connected to the upper part of the oil collecting tank.

[0006] Furthermore, the calcium oxide adding mechanism includes a frustum-shaped storage hopper, with a feeding channel at the bottom of the storage hopper. A vertical feeding shaft is installed inside the feeding channel. The upper end of the feeding shaft extends upward to the top of the storage hopper and is connected to a motor. The lower end of the feeding shaft extends to the bottom of the feeding channel and is fixedly connected to a receiving cylinder. A spiral conveying blade is installed on the outer wall of the feeding shaft. A feeding lever fixedly connected to the feeding shaft is installed inside the storage hopper. An inclined conveying pipe is connected to the receiving cylinder. Multiple vertical feeding and stirring pipes are connected to the bottom of the conveying pipe. The lower end of the feeding and stirring pipe extends into the separation chamber.

[0007] Furthermore, the top of the separating cylinder is provided with a cover plate, and a bracket is provided on the cover plate. The lower end of the receiving cylinder is rotatably mounted on the bracket. The oil discharge mechanism is an oil discharge pump installed on the cover plate. The oil discharge pump is connected to an oil suction pipe, which passes through the cover plate and extends into the separating cylinder.

[0008] Furthermore, the oil suction assembly includes a transparent oil suction cylinder, the bottom wall, side wall and top wall of the oil suction cylinder are provided with multiple water holes, the oil suction cylinder is provided with an oil-absorbing expansion packing layer, the side wall of the oil removal tank is provided with a transparent observation window, and a monitoring element for monitoring the thickness of the oil-absorbing expansion packing layer is provided on the outside of the observation window.

[0009] Furthermore, the top of the oil removal tank is provided with a removable top cover.

[0010] Furthermore, the inner wall of the oil removal tank is provided with multiple vertical guide grooves, and the outer wall of the oil suction cylinder is provided with multiple vertical guide bosses. The guide bosses are inserted into the guide grooves, and the oil suction cylinder is connected to the oil removal tank by screws.

[0011] Furthermore, the oil-absorbing and expanding filler layer is a carbon sponge layer.

[0012] Furthermore, a horizontal oil-removing groove is provided above the oil drain pipe, and the oil suction cylinder can be horizontally placed into the oil-removing groove; a pressure plate is provided inside the oil suction cylinder that slides with the oil suction cylinder, and the oil-absorbing expansion packing layer is provided below the pressure plate; a limiting ring plate is provided at the top of the oil suction cylinder, and the pressure plate is located below the limiting ring plate; a pressure mechanism is provided at one end of the oil-removing groove, and the bottom of the oil-removing groove is connected to the oil drain pipe through a vertical pipe.

[0013] Furthermore, the filter assembly includes a support plate and multiple filter cartridges. Each filter cartridge includes a body and a bottom, with an open top. The support plate has multiple mounting holes evenly distributed around its center, and the upper end of each filter cartridge can be detachably installed into one mounting hole. A vertical rotating shaft is located at the center of the support plate, and a connecting rod is fixedly mounted on the rotating shaft. A sealing cover is fixedly mounted on the connecting rod, and when the rotating shaft is rotated, the sealing cover can be moved to any of the mounting holes.

[0014] The beneficial effects of this invention are as follows: In this invention, the sedimentation tank is used for sedimentation and stratification of wastewater. The less dense oil floats to the surface, while the denser solid particles settle to the bottom. The upper layer of oil is transported to the oil collection tank through an oil drain pipe for oil recovery, while the settled solid particles can be periodically discharged through the first sludge discharge mechanism. The filter tank is used to filter the wastewater, further removing residual solid particles. The oil removal tank uses an oil-absorbing component to adsorb residual grease in the water, improving the grease removal effect. The electrocatalytic oxidation tank is used for advanced oxidation treatment of wastewater, removing various organic matter, metal ions, and other pollutants. The anaerobic and aerobic treatment tanks employ biochemical treatment methods to remove residual ammonia nitrogen, phosphorus, organic matter, and other components from the wastewater. The clear water tank can precipitate the treated water to remove sludge.

[0015] This system is used to treat wastewater from machining workshops. Most pollutants in the wastewater are completely removed, and the water quality meets the relevant discharge standards. It can be discharged directly or reused. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall system;

[0017] Figure 2 This is a front view schematic diagram of the filter tank;

[0018] Figure 3 yes Figure 2 Schematic diagram of section A-A;

[0019] Figure 4 This is a schematic diagram of a settling tank and an oil collecting tank;

[0020] Figure 5 This is a schematic diagram of the calcium oxide addition mechanism;

[0021] Figure 6 This is a schematic diagram of an oil removal tank;

[0022] Figure 7 is a schematic diagram of the oil-absorbing component for oil removal;

[0023] Attached reference numerals: 1—Sedimentation tank; 2—Filter tank; 3—Oil removal tank; 4—Electrocatalytic oxidation tank; 5—Anaerobic treatment tank; 6—Aerobic treatment tank; 7—Clear water tank; 8—Wastewater conveying pipe; 9—Demulsifier addition mechanism; 10—Oil discharge pipe; 11—Oil collection tank; 12—Filter assembly; 121—Support plate; 122—Filter cylinder; 123—Rotating shaft; 124—Connecting rod; 125—Sealing cover; 13—Cathode electrode; 14—Anode electrode; 15—Ozone inlet; 16—Separation cylinder; 17—Calcium oxide addition mechanism; 171—Storage material 172—Feeding channel; 173—Feeding shaft; 174—Motor; 175—Receiving cylinder; 176—Screw conveyor plate; 177—Pulling rod; 178—Feeding pipe; 179—Feeding and stirring pipe; 18—Second slag discharge mechanism; 19—Oil discharge mechanism; 20—First slag discharge mechanism; 21—Cover plate; 22—Support; 23—Oil suction cylinder; 24—Oil absorption expansion packing layer; 25—Observation window; 26—Monitoring element; 27—Top cover; 28—Oil removal tank; 30—Pressure plate; 31—Limiting ring plate; 32—Pressure mechanism. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] The wastewater treatment system for machining workshops of the present invention, such as Figure 1 As shown, the system includes a sedimentation tank 1, a filter tank 2, an oil removal tank 3, an electrocatalytic oxidation tank 4, an anaerobic treatment tank 5, an aerobic treatment tank 6, and a clean water tank 7. The sedimentation tank 1 is equipped with a wastewater conveying pipe 8, and a demulsifier adding mechanism 9 is installed on the wastewater conveying pipe 8. An oil discharge pipe 10 is installed on the upper side wall of the sedimentation tank 1, and the oil discharge pipe 10 is connected to an oil collection tank 11. A first slag discharge mechanism 20 is installed at the bottom of the sedimentation tank 1. The middle part of the sedimentation tank 1 is connected to the filter tank 2, and a filter assembly 12 is installed inside the filter tank 2. The filter tank 2, the oil removal tank 3, the electrocatalytic oxidation tank 4, the anaerobic treatment tank 5, the aerobic treatment tank 6, and the clean water tank 7 are connected in sequence. An oil suction assembly is installed inside the oil removal tank 3. A negative electrode 13 and a positive electrode 14 are installed inside the electrocatalytic oxidation tank 4. An ozone inlet 15 is installed at the bottom of the electrocatalytic oxidation tank 4.

[0026] In the wastewater from the machining workshop, the high density of solid particles makes them prone to settling to the bottom, while the lower density of grease and other contaminants causes them to float to the surface. Therefore, a sedimentation tank 1 is used to treat the wastewater by sedimentation, removing most of the solid particles and grease through static stratification. Since cutting fluids and cleaning fluids are usually emulsions, a demulsifier is added to the wastewater delivery pipe 8 via a demulsifier addition mechanism 9 to promote oil-water separation. Commonly used demulsifiers, such as polydimethylsiloxane, can be used, and the demulsifier can be quantitatively added via a discharge valve. The wastewater delivery pipe 8 transports the wastewater to the sedimentation tank 1. After the demulsifier enters the wastewater delivery pipe 8, it mixes with the wastewater, causing oil-water separation. After sedimentation in the sedimentation tank 1, the denser solid particles settle to the bottom and can be periodically discharged through the first slag discharge mechanism 20, while the less dense grease floats to the surface and is discharged through the oil discharge pipe 10 to the oil collection tank 11, achieving grease recovery. The first slag discharge mechanism 20 can be a slurry pump or similar facility.

[0027] After sedimentation, the wastewater still contains small suspended solids. To remove these solids, filter tank 2 is used to filter the wastewater. Filter assembly 12 can use various common filter screens, filter plates, or granular filter media. Because filter assembly 12 is prone to clogging, it needs frequent cleaning or replacement, during which normal filtration cannot be performed. To avoid interference when replacing filter assembly 12, such as... Figure 2 and Figure 3 As shown, the filter assembly 12 of the present invention includes a support plate 121 and a plurality of filter cylinders 122. Each filter cylinder 122 includes a cylinder body and a cylinder bottom. The upper end of the filter cylinder 122 is open. The support plate 121 is provided with a plurality of mounting holes evenly distributed around the center of the support plate 121. The upper end of each filter cylinder 122 can be detachably installed in one mounting hole. A vertical rotating shaft 123 is provided at the center of the support plate 121. A connecting rod 124 is fixedly provided on the rotating shaft 123. A sealing cover 125 is fixedly provided on the connecting rod 124. When the rotating shaft 123 is rotated, the sealing cover 125 can be moved to any one of the mounting holes.

[0028] Filter tank 2 is a vertically installed circular tank with a removable end cap on top. The support plate 121 is a circular disc, horizontally fixed inside filter tank 2. Filter cylinders 122 can be perforated metal cylinders with a filter cloth layer on the inner wall for wastewater filtration. Sedimentation tank 1 is connected to the top of filter tank 2. Wastewater discharged from sedimentation tank 1 enters filter tank 2, sits above each filter cylinder 122, and then flows downwards, while suspended particles remain in the filter cylinders 122. Each filter cylinder 122 has a large filtration area, ensuring high filtration efficiency. When cleaning a filter cylinder 122, it is removed, and the rotating shaft 123 is rotated, causing the sealing cover 125 to close the mounting hole of the removed filter cylinder 12, preventing wastewater from entering. The remaining filter cylinders 122 can then operate normally. Each filter cartridge 12 can be cleaned individually. During the cleaning process, only one filter cartridge 12 needs to be removed, while the remaining filter cartridges 122 continue to work normally and do not affect the filtration of wastewater.

[0029] After settling, the wastewater still contains a small amount of oil that is difficult to separate. In the oil removal tank 3, the residual oil is removed by adsorption.

[0030] After settling, filtration, and oil removal, the wastewater still contains harmful components such as heavy metal ions and various organic compounds. Advanced oxidation treatment using an electrocatalytic oxidation tank 4 removes heavy metal ions and decomposes organic matter. Specifically, the cathode 13 and anode 14 are connected to the negative and positive terminals of a DC power supply, respectively. Ozone is simultaneously introduced into the electrocatalytic oxidation tank through the ozone inlet 15. When the cathode 13 and anode 14 are energized, the ozone generates strong oxidizing substances such as hydroxyl radicals, which can decompose organic matter and other difficult-to-treat substances. Furthermore, water near the cathode 13 gains electrons to generate hydroxide ions. These hydroxide ions combine with heavy metal ions to form precipitates, thereby removing heavy metal ions.

[0031] After settling, filtration, oil removal, and advanced oxidation, most pollutants in the wastewater are removed. However, small amounts of ammonia nitrogen, phosphorus, and organic matter remain. Therefore, anaerobic treatment tank 5 and aerobic treatment tank 6 are used for biological treatment of the wastewater. Both anaerobic treatment tank 5 and aerobic treatment tank 6 are equipped with microbial packing materials. The anaerobic microorganisms in anaerobic treatment tank 5 and the aerobic microorganisms in aerobic treatment tank 6 can decompose ammonia nitrogen, organic matter, and other pollutants. An aeration device is installed at the bottom of aerobic treatment tank 6 to aerate the water, increase the oxygen content, promote the growth of aerobic microorganisms, and ensure that the dissolved oxygen content in the water meets the discharge standards.

[0032] Sludge will be generated in anaerobic treatment tank 5 and aerobic treatment tank 6. Some of the sludge will settle to the bottom of anaerobic treatment tank 5 and aerobic treatment tank 6 and can be discharged periodically. Some of the sludge will enter the clear water tank 7 and settle to the bottom of the clear water tank 7. A drain pipe is installed at the top of the clear water tank 7, and the clear water will be discharged through the drain pipe.

[0033] This system is used to treat wastewater from machining workshops. Most pollutants in the wastewater are completely removed, and the water quality meets the relevant discharge standards. It can be discharged directly or reused.

[0034] Oil collecting tank 11 is used to collect the separated grease, but during oil-water separation, a small amount of water will also enter oil collecting tank 11 along with the oil. To facilitate the separation of water from the oil, such as... Figure 4 As shown, a separation cylinder 16 is centrally located in the oil collecting tank 11. The separation cylinder 16 is coaxial with the oil collecting tank 11, and a separation chamber exists between the separation cylinder 16 and the oil collecting tank 11. The bottom of the inner cavity of the separation cylinder 16 communicates with the bottom of the separation chamber. A calcium oxide adding mechanism 17 is located above the separation chamber, used to add calcium oxide into the separation chamber. A second slag discharge mechanism 18 is located at the bottom of the separation chamber and is connected to the wastewater conveying pipe 8. An oil discharge mechanism 19 is located at the top of the inner cavity of the separation cylinder 16; the oil discharge pipe 10 communicates with the upper part of the separation chamber of the oil collecting tank 11.

[0035] In sedimentation tank 1, the oil on the surface of the wastewater enters the upper part of the separation chamber of oil collection tank 11 through oil drain pipe 10. Simultaneously, calcium oxide adding mechanism 17 adds an appropriate amount of calcium oxide particles to the separation chamber. The particle size of the calcium oxide particles is 2 to 3 mm. Since calcium oxide does not react with oil but can react with water to form calcium hydroxide, it can absorb water from the oil. After absorbing water, the generated calcium hydroxide precipitates to the bottom of oil collection tank 11, and excess calcium oxide also precipitates to the bottom of oil collection tank 11, which can be periodically discharged through the second slag discharge mechanism 18. The oil in the separation chamber enters the separation cylinder 16 at the bottom of the separation chamber and is finally discharged through the oil discharge mechanism 19 at the top of the inner cavity of the separation cylinder 16. The oil discharge mechanism 19 can be an oil drain pipe connected to an oil discharge pump.

[0036] To facilitate the treatment of the sediment at the bottom of the oil collection tank 11, this invention employs a second slag discharge mechanism 18 to transport the sediment from the bottom of the oil collection tank 11 to the wastewater conveying pipe 8. The sediment mainly consists of calcium oxide and calcium hydroxide. A small amount of oil is also transported to the wastewater conveying pipe 8, but this does not affect subsequent treatment. After the sediment mixes with the wastewater in the wastewater conveying pipe 8, all the calcium oxide is converted into calcium hydroxide. After the calcium hydroxide dissolves, the hydroxide ions can react with the heavy metal ions in the wastewater to form precipitates, which settle to the bottom of the sedimentation tank 1. Therefore, some heavy metal ions can be removed, reducing the content of heavy metal ions.

[0037] In this invention, the calcium oxide adding mechanism 17 can adopt various existing granular material adding mechanisms. As a preferred embodiment, the calcium oxide adding mechanism 17 includes a frustum-shaped storage hopper 171. The bottom of the storage hopper 171 is provided with a feeding channel 172. A vertical feeding shaft 173 is provided in the feeding channel 172. The upper end of the feeding shaft 173 extends upward to the top of the storage hopper 171 and is connected to a motor 174. The lower end of the feeding shaft 173 extends to the bottom of the feeding channel 172 and is fixedly connected to a receiving cylinder 175. A spiral conveying plate 176 is provided on the outer wall of the feeding shaft 173. A feeding rod 177 is provided in the storage hopper 171 and is fixedly connected to the feeding shaft 173. An inclined conveying pipe 178 is connected to the receiving cylinder 175. Multiple vertical feeding and stirring pipes 179 are connected to the bottom of the conveying pipe 178. The lower end of the feeding and stirring pipes 179 extends into the separation chamber.

[0038] The storage hopper 171 stores calcium oxide particles. Due to the poor flowability of solid granular materials and the friction between them, the feeding channel 172 is easily blocked, making it difficult to ensure continuous and uniform feeding. In this invention, during feeding, a motor 174 drives the feeding shaft 173 to rotate at a constant speed. The feeding shaft 173 drives the spiral conveyor 176 and the feeding rod 177 to rotate. The feeding rod 177 can agitate the calcium oxide particles, causing them to flow into the feeding channel 172. Meanwhile, the spiral conveyor 176 pushes the calcium oxide particles downwards in the feeding channel 172, preventing them from blocking the channel and achieving stable, uniform, and continuous addition of calcium oxide.

[0039] Calcium oxide particles in the feeding channel 17 fall downwards into the receiving cylinder 175, then into the conveying pipe 178, and then into each feeding and stirring pipe 179, falling into the separation chamber along the feeding and stirring pipe 179. Since the feeding and stirring pipe 179, the conveying pipe 178, the receiving cylinder 175, and the feeding shaft 173 are fixedly connected, the feeding shaft 173 can drive the receiving cylinder 175, the conveying pipe 178, and the feeding and stirring pipe 179 to rotate. The feeding and stirring pipe 179 can stir the oil in the separation chamber, ensuring that calcium oxide and oil are evenly and fully mixed, thus improving the dehydration effect.

[0040] To improve the stability of the rotation of the separating cylinder 16 and the feeding shaft 173, a cover plate 21 is provided on the top of the separating cylinder 16, and a bracket 22 is provided on the cover plate 21. The lower end of the receiving cylinder 175 is rotatably mounted on the bracket 22. The oil discharge mechanism 19 is an oil discharge pump installed on the cover plate 21. The oil discharge pump is connected to an oil suction pipe, which passes through the cover plate 21 and extends into the separating cylinder 16.

[0041] Oil-absorbing components can use various existing oil-absorbing materials, such as activated carbon, super absorbent resin, and oil-absorbing sponges. Currently, oil-absorbing materials are usually replaced periodically. When replacing them, there may be issues such as the oil-absorbing material not reaching saturation or reaching saturation prematurely. It is not possible to accurately determine whether the oil-absorbing component has reached saturation, which can easily lead to problems such as the oil-absorbing component not being fully utilized or not being replaced in time, resulting in incomplete oil absorption.

[0042] To solve the above problems, the oil suction assembly of the present invention includes a transparent oil suction cylinder 23. The bottom wall, side wall and top wall of the oil suction cylinder 23 are provided with a plurality of water holes. An oil suction expansion packing layer 24 is provided inside the oil suction cylinder 23. A transparent observation window 25 is provided on the side wall of the oil removal tank 3. A monitoring element 26 for monitoring the thickness of the oil suction expansion packing layer 24 is provided on the outside of the observation window 25.

[0043] The oil suction cylinder 23 can be made of plexiglass, and the oil-absorbing expansion packing layer 24 can be made of granular oil-absorbing expansion material. After absorbing oil, the volume of the oil-absorbing expansion material increases. The observation window 25 can be made of tempered glass. The monitoring element 26 can be a camera or similar device, allowing monitoring of the thickness of the oil-absorbing expansion packing layer 24 through the observation window 25. Management personnel can also observe the thickness of the oil-absorbing expansion packing layer 24 through the observation window 25. Before oil absorption, the thickness of the oil-absorbing expansion packing layer 24 is relatively small and does not completely fill the inner cavity of the oil suction cylinder 23. During the oil absorption process, the oil-absorbing expansion packing layer 24 gradually expands, increasing in thickness. When the thickness of the oil-absorbing expansion packing layer 24 reaches a set value, it can be replaced. Through testing, the thickness of the oil-absorbing expansion packing layer 24 after it has reached saturation can be determined; this thickness is the set thickness.

[0044] This invention uses a material that expands after absorbing oil to absorb oil, and monitors the thickness of the oil-absorbing expansion packing layer 24 in real time. This allows for accurate timing of replacing the oil-absorbing expansion packing layer 24, avoiding premature replacement that would result in the oil-absorbing material not being fully utilized. At the same time, it also prevents the oil-absorbing material from being saturated with oil and failing to be replaced in time, thus ensuring the oil removal effect.

[0045] In this invention, the top of the oil removal tank 3 is equipped with a detachable top cover 27, which can seal the oil removal tank 3 to prevent external impurities from falling into it. Since the oil-absorbing expansion packing layer 24 is typically made of a low-density material and easily floats to the surface, to ensure that the oil-absorbing expansion packing layer 24 is submerged in water, the inner wall of the oil removal tank 3 is provided with multiple vertical guide grooves, and the outer wall of the oil suction cylinder 23 is provided with multiple vertical guide protrusions. The guide protrusions are inserted into the guide grooves, and the oil suction cylinder 23 is connected to the oil removal tank 3 by screws. After the oil suction cylinder 23 is fixedly installed with screws, the internal oil-absorbing expansion packing layer 24 can be completely submerged in water, ensuring the oil absorption effect. When replacing the oil-absorbing expansion packing layer 24, simply remove the top cover 27, remove the oil suction cylinder 23, and install a new oil suction cylinder 23.

[0046] In this invention, the oil-absorbing expansion filler layer 24 is made of carbon sponge. Carbon sponge has a good oil absorption effect and can discharge the absorbed oil by squeezing. It does not affect the oil absorption effect after multiple squeezing and deformation, and can be reused to reduce implementation costs.

[0047] To facilitate the removal of oil from the oil-absorbing expansion packing layer 24, a horizontal oil-removing groove 28 is provided above the oil drain pipe 10, and the oil suction cylinder 23 can be horizontally placed into the oil-removing groove 28; a pressure plate 30 is provided inside the oil suction cylinder 23 and slides with the oil suction cylinder 23, and the oil-absorbing expansion packing layer 24 is located below the pressure plate 30; a limiting ring plate 31 is provided at the top of the oil suction cylinder 23, and the pressure plate 30 is located below the limiting ring plate 31; a pressure mechanism 32 is provided at one end of the oil-removing groove 28, and the bottom of the oil-removing groove 28 is connected to the oil drain pipe 10 through a vertical pipe. After the oil-absorbing expansion packing layer 24 reaches saturation, it is horizontally placed into the oil-removing tank 28. One end of the pressure plate 30 faces the pressure mechanism 32, while the other end is pressed against the inner wall of the oil-removing tank 28. The pressure mechanism 32 pushes the pressure plate 30 towards the oil-absorbing expansion packing layer 24, squeezing it to expel the absorbed oil. The oil enters the oil-removing tank 28 and flows through a vertical pipe into the oil drain pipe 10, finally flowing into the oil collection tank 11 for oil recovery. After oil removal, the pressure mechanism 32 resets, and the oil-absorbing assembly can be reused. This invention achieves oil removal without removing the oil-absorbing expansion packing layer 24, making operation more convenient.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A wastewater treatment system for a machining workshop, characterized in that: The system includes a sedimentation tank (1), a filter tank (2), an oil removal tank (3), an electrocatalytic oxidation tank (4), an anaerobic treatment tank (5), an aerobic treatment tank (6), and a clear water tank (7). The sedimentation tank (1) is equipped with a wastewater conveying pipe (8), and a demulsifier adding mechanism (9) is installed on the wastewater conveying pipe (8). An oil drain pipe (10) is installed on the upper side wall of the sedimentation tank (1), and the oil drain pipe (10) is connected to an oil collection tank (11). A first slag discharge mechanism is installed at the bottom of the sedimentation tank (1). 20); The middle part of the sedimentation tank (1) is connected to the filter tank (2), and the filter tank (2) is equipped with a filter assembly (12); The filter tank (2), the oil removal tank (3), the electrocatalytic oxidation tank (4), the anaerobic treatment tank (5), the aerobic treatment tank (6) and the clear water tank (7) are connected in sequence. The oil removal tank (3) is equipped with an oil suction assembly, and the electrocatalytic oxidation tank (4) is equipped with a negative electrode (13) and a positive electrode (14). The bottom of the electrocatalytic oxidation tank (4) is equipped with an ozone inlet (15). The oil collecting tank (11) has a separation cylinder (16) at its center. There is a separation chamber between the separation cylinder (16) and the oil collecting tank (11). The bottom of the inner cavity of the separation cylinder (16) is connected to the bottom of the separation chamber. A calcium oxide adding mechanism (17) is provided above the separation chamber. A second slag discharge mechanism (18) is provided at the bottom of the separation chamber. The second slag discharge mechanism (18) is connected to the wastewater conveying pipe (8). An oil discharge mechanism (19) is provided at the top of the inner cavity of the separation cylinder (16). The oil discharge pipe (10) is connected to the upper part of the oil collecting tank (11). The oil suction assembly includes a transparent oil suction cylinder (23). The bottom wall, side wall and top wall of the oil suction cylinder (23) are provided with multiple water holes. An oil suction expansion packing layer (24) is provided inside the oil suction cylinder (23). A transparent observation window (25) is provided on the side wall of the oil removal tank (3). A monitoring element (26) for monitoring the thickness of the oil suction expansion packing layer (24) is provided on the outside of the observation window (25). A horizontal oil removal groove (28) is provided above the oil drain pipe (10), and the oil suction cylinder (23) can be horizontally placed into the oil removal groove (28); a pressure plate (30) is provided inside the oil suction cylinder (23) and slides with the oil suction cylinder (23), and the oil absorption expansion packing layer (24) is provided below the pressure plate (30); a limiting ring plate (31) is provided at the top of the oil suction cylinder (23), and the pressure plate (30) is located below the limiting ring plate (31); a pressure mechanism (32) is provided at one end of the oil removal groove (28), and the bottom of the oil removal groove (28) is connected to the oil drain pipe (10) through a vertical pipe.

2. The wastewater treatment system for a machining workshop as described in claim 1, characterized in that: The calcium oxide adding mechanism (17) includes a frustum-shaped storage hopper (171). A feeding channel (172) is provided at the bottom of the storage hopper (171). A vertical feeding shaft (173) is provided inside the feeding channel (172). The upper end of the feeding shaft (173) extends upward to the top of the storage hopper (171) and is connected to a motor (174). The lower end of the feeding shaft (173) extends to the bottom of the feeding channel (172) and is fixedly connected to it. A receiving cylinder (175) is connected to the material receiving shaft (173), and a spiral conveying blade (176) is provided on the outer wall of the material receiving shaft (173). A material feeding rod (177) is fixedly connected to the material receiving shaft (173) in the storage hopper (171). An inclined conveying pipe (178) is connected to the receiving cylinder (175). Multiple vertical feeding and stirring pipes (179) are connected to the bottom of the conveying pipe (178). The lower end of the feeding and stirring pipe (179) extends into the separation chamber.

3. The wastewater treatment system for a machining workshop as described in claim 2, characterized in that: The top of the separation cylinder (16) is provided with a cover plate (21), and a bracket (22) is provided on the cover plate (21). The lower end of the receiving cylinder (175) is rotatably installed on the bracket (22). The oil discharge mechanism (19) is an oil discharge pump installed on the cover plate (21). The oil discharge pump is connected to an oil suction pipe, which passes through the cover plate (21) and extends into the separation cylinder (16).

4. The wastewater treatment system for a machining workshop as described in claim 1, characterized in that: The top of the oil removal tank (3) is provided with a removable top cover (27).

5. The wastewater treatment system for a machining workshop as described in claim 1, characterized in that: The inner wall of the oil removal tank (3) is provided with multiple vertical guide grooves, and the outer wall of the oil suction cylinder (23) is provided with multiple vertical guide bosses. The guide bosses are inserted into the guide grooves, and the oil suction cylinder (23) is connected to the oil removal tank (3) by screws.

6. The wastewater treatment system for a machining workshop as described in claim 1, characterized in that: The oil-absorbing and expanding filler layer (24) is a carbon sponge layer.

7. The wastewater treatment system for a machining workshop as described in claim 1, characterized in that: The filter assembly (12) includes a support plate (121) and multiple filter cylinders (122). Each filter cylinder (122) includes a cylinder body and a cylinder bottom. The upper end of the filter cylinder (122) is open. The support plate (121) is provided with multiple mounting holes evenly distributed around the center of the support plate (121). The upper end of each filter cylinder (122) can be detachably installed in one mounting hole. A vertical rotating shaft (123) is provided at the center of the support plate (121). A connecting rod (124) is fixedly provided on the rotating shaft (123). A sealing cover (125) is fixedly provided on the connecting rod (124). When the rotating shaft (123) is rotated, the sealing cover (125) can be moved to any one of the mounting holes.

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