Machining workshop wastewater treatment system

Abstract

The present invention relates to a machining workshop wastewater treatment system, which comprises a precipitation tank, a filtration tank, an oil removal tank, an electrocatalytic oxidation tank, an anaerobic treatment tank, an aerobic treatment tank and a clear water tank, the precipitation tank is provided with a wastewater delivery pipe, and the wastewater delivery pipe is provided with a demulsifier adding mechanism; an oil discharge pipe is arranged on the side wall of the upper part of the settling tank and connected with an oil collecting tank, and a first deslagging mechanism is arranged at the bottom of the settling tank; the middle part of the settling tank is connected with a filtering tank; a filtering assembly is arranged in the filtering tank; the filtering tank, the oil removal tank, the electrocatalytic oxidation tank, the anaerobic treatment tank, the aerobic treatment tank and the clear water tank are sequentially connected, an oil absorption assembly is arranged in the oil removal tank, a negative electrode and a positive electrode are arranged in the electrocatalytic oxidation tank, and an ozone inlet is formed in the bottom of the electrocatalytic oxidation tank. When the system is used for treating the wastewater of the machining workshop, most pollutants in the wastewater are fully removed, the water quality reaches the relevant discharge standard, and the wastewater can be directly discharged and can also be reused.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment, in particular to a wastewater treatment system for a machining workshop. Background Art

[0002] Mechanical processing plants will produce various wastewaters during the production process, such as oily wastewater, acid-base wastewater, organic wastewater, etc. Oily wastewater mainly comes from the lubrication, cooling, transmission system, and parts cleaning during the machining process. Acid-base wastewater comes from surface treatment processes, such as pickling and phosphating. Organic wastewater may come from the coating process or the use of other organic solvents. The wastewater in the machining workshop has the characteristics of high grease content, high metal particles and metal ion content, and direct discharge will seriously 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 a machining workshop, which can purify the wastewater from the machining workshop so that the water quality meets the discharge standard.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is: a machining workshop wastewater treatment system, 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 provided with a wastewater delivery pipe, and a demulsifier adding mechanism is provided on the wastewater delivery pipe; an oil discharge pipe is provided on the upper side wall of the sedimentation tank, and the oil discharge pipe is connected to an oil collecting tank, and a first slag discharge mechanism is provided 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 provided in the filter tank; the filter tank, the oil removal tank, the electrocatalytic oxidation tank, the anaerobic treatment tank, the aerobic treatment tank and the clean water tank are connected in sequence, an oil absorption assembly is provided in the oil removal tank, a cathode electrode and an anode electrode are provided in the electrocatalytic oxidation tank, and an ozone inlet is provided at the bottom of the electrocatalytic oxidation tank.

[0005] Furthermore, a separation cylinder is provided at the center of the oil collecting tank, 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 with 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 the second slag discharge mechanism is connected to the wastewater conveying pipe; an oil discharge mechanism is provided at the top of the inner cavity of the separation cylinder; and the oil discharge pipe is connected with the upper part of the oil collecting tank.

[0006] Furthermore, the calcium oxide adding mechanism includes a truncated cone-shaped storage hopper, a feeding channel is provided at the bottom of the storage hopper, a vertical feeding shaft is provided in 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 barrel, a spiral conveying sheet is provided on the outer wall of the feeding shaft, a material shifting rod fixedly connected to the feeding shaft is provided in the storage hopper, the receiving barrel is connected to an inclined feeding pipe, a plurality of vertical feeding and stirring pipes are connected to the bottom of the feeding pipe, and the lower end of the feeding and stirring pipe extends into the separation chamber.

[0007] Furthermore, a cover plate is provided on the top of the separation cylinder, a bracket is provided on the cover plate, and the lower end of the receiving cylinder can be 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, and the oil suction pipe passes through the cover plate and extends into the separation 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 all provided with multiple water holes, an oil absorption expansion filler layer is provided inside the oil suction cylinder, and 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 absorption expansion filler layer is provided outside the observation window.

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

[0010] Furthermore, the inner wall of the oil removal tank is provided with a plurality of vertical guide grooves, the outer wall of the oil suction cylinder is provided with a plurality of 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 swelling filler layer is a carbon sponge layer.

[0012] Furthermore, a horizontal oil removal groove is arranged above the oil discharge pipe, and the oil suction cylinder can be placed horizontally into the oil removal groove; a pressure plate slidingly matched with the oil suction cylinder is arranged inside the oil suction cylinder, and the oil absorption expansion filler layer is arranged below the pressure plate; a limiting ring plate is arranged on the top of the oil suction cylinder, and the pressure plate is located below the limiting ring plate; a pressure mechanism is arranged at one end of the oil removal groove, and the bottom of the oil removal groove is connected to the oil discharge pipe through a vertical pipe.

[0013] Furthermore, the filter assembly includes a support plate and multiple filter cartridges, the filter cartridge includes a cartridge body and a cartridge bottom, the upper end of the filter cartridge is open, the support plate is provided with multiple mounting holes evenly distributed around the center of the support plate, and the upper end of each filter cartridge can be removably installed in a mounting hole; a vertical rotating shaft is provided at the center of the support plate, a connecting rod is fixedly provided on the rotating shaft, a sealing cover is fixedly provided on the connecting rod, and when the rotating shaft is rotated, the sealing cover can be moved to any mounting hole.

[0014] The beneficial effects of the present invention are as follows: in the present invention, the sedimentation tank is used to precipitate and stratify the wastewater, the oil with a lower density floats to the water surface, and the solid particles with a higher density settle to the bottom of the water, the oil in the upper layer is transported to the oil collecting tank through the oil discharge pipe to achieve oil recovery, and the precipitated solid particles can be discharged regularly through the first slag discharge mechanism. The filter tank is used to filter the wastewater to further remove the residual solid particles. The oil removal tank absorbs the residual grease in the water through the oil absorption component to improve the grease removal effect. The electrocatalytic oxidation tank is used to perform advanced oxidation treatment on the wastewater, which can remove various organic matter, metal ions and other pollutants in the wastewater. The anaerobic treatment tank and the aerobic treatment tank adopt a biochemical treatment method to remove residual ammonia nitrogen, phosphorus, organic matter and other components in the wastewater. The clean water tank can precipitate the treated water and remove the sludge in the water.

[0015] This system is used to treat the wastewater in the machining workshop. Most of the pollutants in the wastewater are fully removed, and the water quality meets the relevant emission standards. It can be discharged directly or reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the overall schematic diagram of this system;

[0017] Figure 2 It is a schematic diagram of the main view of the filter tank;

[0018] Figure 3 yes Figure 2 A-A cross-sectional view;

[0019] Figure 4 It is a schematic diagram of the sedimentation tank and the oil collection tank;

[0020] Figure 5 It is a schematic diagram of the calcium oxide adding mechanism;

[0021] Figure 6 It is a schematic diagram of the oil removal tank;

[0022] Figure 7 It is a schematic diagram of oil removal of the oil absorption component;

[0023] Figure numerals: 1—precipitation tank; 2—filtration tank; 3—oil removal tank; 4—electrocatalytic oxidation tank; 5—anaerobic treatment tank; 6—aerobic treatment tank; 7—clean water tank; 8—wastewater delivery pipe; 9—demulsifier addition mechanism; 10—oil discharge pipe; 11—oil collecting tank; 12—filter assembly; 121—support plate; 122—filter cartridge; 123—rotating shaft; 124—connecting rod; 125—sealing cover; 13—cathode electrode; 14—anodine electrode; 15—ozone inlet; 16—separation cartridge; 17—calcium oxide addition mechanism; 171—storage material Bucket; 172—feeding channel; 173—feeding shaft; 174—motor; 175—receiving barrel; 176—screw conveyor plate; 177—feeding 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—bracket; 23—oil suction barrel; 24—oil absorption expansion packing layer; 25—observation window; 26—monitoring element; 27—top cover; 28—oil removal tank; 30—pressing plate; 31—limiting ring plate; 32—pressure mechanism. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] The machining workshop wastewater treatment system of the present invention is as follows: Figure 1 As shown, it 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 provided with a wastewater conveying pipe 8, and a demulsifier adding mechanism 9 is provided on the wastewater conveying pipe 8; an oil discharge pipe 10 is provided on the upper side wall of the sedimentation tank 1, and the oil discharge pipe 10 is connected to an oil collecting tank 11, and a first slag discharge mechanism 20 is provided 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 provided in 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 absorption assembly is provided in the oil removal tank 3, a cathode electrode 13 and an anode electrode 14 are provided in the electrocatalytic oxidation tank 4, and an ozone inlet 15 is provided at the bottom of the electrocatalytic oxidation tank 4.

[0026] In the wastewater of the machining workshop, the solid particle content is high and the density is large, so it is easy to settle to the bottom of the water. The density of grease and the like is small and it is easy to float to the surface of the water. Therefore, the wastewater is first precipitated by using a sedimentation tank 1, and most of the solid particles and oil stains are removed by static stratification. Since cutting fluid, cleaning, etc. are usually emulsions, in order to promote oil-water separation, a demulsifier is first added to the wastewater delivery pipe 8 by a demulsifier adding mechanism 9. The demulsifier can be an existing commonly used demulsifier, such as polydimethylsiloxane, etc., which can be quantitatively discharged through a discharge valve. The wastewater delivery pipe 8 is used to transport the wastewater to the sedimentation tank 1. After the demulsifier enters the wastewater delivery pipe 8, it mixes with the wastewater to separate the oil and water. Then, after precipitation in the sedimentation tank 1, the solid particles with a larger density are precipitated to the bottom of the water and can be discharged regularly through the first slag discharge mechanism 20, while the grease with a smaller density floats to the water surface and is discharged to the oil collecting tank 11 through the oil discharge pipe 10 to achieve grease recovery. The first slag discharge mechanism 20 can be a slurry pump or other facilities.

[0027] After sedimentation, the wastewater still contains small particles of suspended matter. In order to remove these suspended matter, the wastewater is filtered using a filter tank 2. The filter assembly 12 can use various commonly used existing filter screens, filter plates or particle filter materials. Since the filter assembly 12 is easily clogged, it needs to be cleaned or replaced frequently. When cleaning or replacing, the filter cannot be filtered normally. In order to avoid the impact of replacing the 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 cartridges 122, the filter cartridge 122 includes a cartridge body and a cartridge bottom, the upper end of the filter cartridge 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, and the upper end of each filter cartridge 122 can be detachably installed in a mounting hole; a vertical rotating shaft 123 is provided in 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, and when the rotating shaft 123 is rotated, the sealing cover 125 can be moved to any mounting hole.

[0028] The filter tank 2 is a vertically mounted circular tank with a detachable head on the top. The support plate 121 is a disc fixed horizontally in the filter tank 2. The filter cartridge 122 can be a metal cylinder with holes, and a filter cloth layer is arranged on the inner wall of the metal cylinder, so that the wastewater can be filtered. The sedimentation tank 1 is connected with the top of the filter tank 2. After the wastewater discharged from the sedimentation tank 1 enters the filter tank 2, it is located above each filter cartridge 122 and then flows downward, and the suspended particles in the water stay in the filter cartridge 122. The body and bottom of each filter cartridge 122 can be filtered, and the filtering area is large, which can ensure the filtering efficiency. When the filter cartridge 122 needs to be cleaned, the filter cartridge 12 is taken out, and the rotating shaft 123 is rotated to drive the sealing cover 125 to rotate, so that the sealing cover 125 closes the mounting hole of the removed filter cartridge 12 to prevent wastewater from entering the mounting hole, and the remaining filter cartridges 122 can work normally. Each filter cartridge 12 can be cleaned one by one. During the cleaning process, only one filter cartridge 12 needs to be removed, and the remaining filter cartridges 122 can work normally without affecting the filtration of wastewater.

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

[0030] After static sedimentation, filtration and oil removal, the wastewater still contains harmful components such as heavy metal ions and various organic substances. The electrocatalytic oxidation tank 4 is used to perform advanced oxidation treatment on the wastewater to remove heavy metal ions and decompose organic substances. Specifically, the cathode 13 and the anode 14 are respectively connected to the negative electrode and the positive electrode of the DC power supply, and ozone is introduced into the electrocatalytic oxidation tank through the ozone inlet 15. After the cathode 13 and the anode 14 are energized, ozone is prompted to produce strong oxidizing substances such as hydroxyl free radicals, which can decompose organic substances and other difficult-to-treat substances. In addition, the water near the cathode 13 obtains electrons to generate hydroxide ions, and the hydroxide ions and heavy metal ions combine to form precipitation, thereby removing heavy metal ions.

[0031] After static sedimentation, filtration, oil removal and advanced oxidation treatment, most of the pollutants in the wastewater are removed, but a small amount of ammonia nitrogen, phosphorus, organic matter, etc. remain. Therefore, the anaerobic treatment tank 5 and the aerobic treatment tank 6 are used to biochemically treat the wastewater. Microbial fillers are provided in the anaerobic treatment tank 5 and the aerobic treatment tank 6. The anaerobic microorganisms in the anaerobic treatment tank 5 and the aerobic microorganisms in the aerobic treatment tank 6 can decompose pollutants such as ammonia nitrogen and organic matter. An aeration device is provided at the bottom of the aerobic treatment tank 6 to aerate the aerobic treatment tank 6 to increase the oxygen content in the aerobic treatment tank 6, promote the growth of aerobic microorganisms, and at the same time make the dissolved oxygen content in the water meet the discharge standard.

[0032] Sludge will be produced in the anaerobic treatment tank 5 and the aerobic treatment tank 6. Part of the sludge will settle to the bottom of the anaerobic treatment tank 5 and the aerobic treatment tank 6 and can be discharged regularly. Part of the sludge will enter the clean water tank 7 and settle to the bottom of the clean water tank 7. A drain pipe is set on the top of the clean water tank 7, and the clean water is discharged through the drain pipe.

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

[0034] The oil collecting tank 11 is used to collect the separated grease. However, when separating the oil and water, a small amount of water will also enter the oil collecting tank 11 along with the oil. In order to facilitate the separation of water from the oil, Figure 4 As shown, a separation cylinder 16 is arranged at the center of the oil collecting tank 11, and the separation cylinder 16 is coaxial with the oil collecting tank 11. A separation chamber is arranged between the separation cylinder 16 and the oil collecting tank 11, and the bottom of the inner chamber of the separation cylinder 16 is connected to the bottom of the separation chamber. A calcium oxide adding mechanism 17 is arranged above the separation chamber, and the calcium oxide adding mechanism 17 is used to add calcium oxide to the separation chamber. A second slag discharge mechanism 18 is arranged at the bottom of the separation chamber, and the second slag discharge mechanism 18 is connected to the wastewater conveying pipe 8. An oil discharge mechanism 19 is arranged at the top of the inner chamber of the separation cylinder 16; and the oil discharge pipe 10 is connected to the upper part of the separation chamber of the oil collecting tank 11.

[0035] In the sedimentation tank 1, the oil on the surface of the wastewater enters the upper part of the separation chamber of the oil collecting tank 11 through the oil discharge pipe 10, and at the same time, the calcium oxide adding mechanism 17 adds an appropriate amount of calcium oxide particles into 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 and generate calcium hydroxide, it can absorb water in the oil. After absorbing water, the generated calcium hydroxide is precipitated to the bottom of the oil collecting tank 11, and the excess calcium oxide is also precipitated to the bottom of the oil collecting tank 11, which can be discharged regularly 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 discharge pipe, which is connected to an oil discharge pump.

[0036] In order to facilitate the treatment of the sediment at the bottom of the oil collecting tank 11, the present invention adopts a second slag discharge mechanism 18 to transport the sediment at the bottom of the oil collecting tank 11 to the wastewater delivery pipe 8. The sediment is mainly calcium oxide and calcium hydroxide. A small amount of oil will also be transported to the wastewater delivery pipe 8, but it will not affect the subsequent treatment. After the sediment is mixed with the wastewater in the wastewater delivery pipe 8, the calcium oxide is completely converted into calcium hydroxide. After the calcium hydroxide is dissolved, the hydroxide ions can react with the heavy metal ions in the wastewater to generate precipitation materials, and the precipitation materials are precipitated to the bottom of the precipitation tank 1. Therefore, some heavy metal ions can be removed and the content of heavy metal ions can be reduced.

[0037] In the present invention, the calcium oxide adding mechanism 17 can adopt various existing particle material adding mechanisms as a preferred embodiment: the calcium oxide adding mechanism 17 includes a truncated cone-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 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 barrel 175, a spiral conveying sheet 176 is provided on the outer wall of the feeding shaft 173, a material shifting rod 177 fixedly connected to the feeding shaft 173 is provided in the storage hopper 171, the feeding barrel 175 is connected to an inclined feeding pipe 178, a plurality of vertical feeding and stirring pipes 179 are connected to the bottom of the feeding pipe 178, and the lower end of the feeding and stirring pipe 179 extends into the separation chamber.

[0038] Calcium oxide particles are stored in the storage hopper 171. Since the solid particle material has poor fluidity and there is friction between them, the feeding channel 172 is easily blocked, and it is difficult to ensure continuous and uniform feeding. In the present invention, when feeding, the motor 174 is used to drive the feeding shaft 173 to rotate at a constant speed, and the feeding shaft 173 drives the spiral conveying piece 176 and the material shifting rod 177 to rotate. The material shifting rod 177 can wave the calcium oxide particles to promote the calcium oxide particles to flow into the feeding channel 172, and the spiral conveying piece 176 can push the calcium oxide particles in the feeding channel 172 to move downward, so as to prevent the calcium oxide particles from blocking the feeding channel 172, thereby realizing stable, uniform and continuous addition of calcium oxide.

[0039] The calcium oxide particles in the discharge channel 17 fall downward into the receiving barrel 175, then enter the feeding pipe 178, and then enter each feeding and stirring pipe 179, and fall into the separation chamber along the feeding and stirring pipe 179. Since the feeding and stirring pipe 179, the feeding pipe 178, the receiving barrel 175 and the discharge shaft 173 are fixedly connected, the discharge shaft 173 can drive the receiving barrel 175, the feeding pipe 178 and the feeding and stirring pipe 179 to rotate, and the feeding and stirring pipe 179 can stir the oil in the separation chamber to ensure that the calcium oxide and the oil are evenly and fully mixed, thereby improving the water removal effect.

[0040] In order to improve the rotation stability of the separation cylinder 16 and the material discharge shaft 173, a cover plate 21 is provided on the top of the separation cylinder 16, a bracket 22 is provided on the cover plate 21, and the lower end of the receiving cylinder 175 can be rotatably mounted on the bracket 22. The oil discharge mechanism 19 is an oil discharge pump installed on the cover plate 21, and 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.

[0041] The oil absorption component can adopt various existing oil absorption materials, such as activated carbon, high oil absorption resin, oil absorption sponge, etc. At present, the oil absorption material is usually replaced regularly. During replacement, there may be a problem that the oil absorption material has not reached the saturation state or has reached the saturation state in advance. It is impossible to accurately judge whether the oil absorption of the oil absorption component has reached saturation, which easily leads to the problem that the oil absorption component is not fully utilized or the oil absorption component is not replaced in time, resulting in incomplete oil absorption.

[0042] In order to solve the above problems, the oil absorption assembly of the present invention includes a transparent oil absorption cylinder 23, the bottom wall, side wall and top wall of the oil absorption cylinder 23 are provided with multiple water holes, an oil absorption expansion filler layer 24 is provided in the oil absorption cylinder 23, and 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 absorption expansion filler layer 24 is provided outside the observation window 25.

[0043] The oil absorption cylinder 23 may be made of organic glass cylinder, and the oil absorption expansion packing layer 24 may be a granular oil absorption expansion material. After the oil absorption expansion material absorbs oil, its volume will increase. The observation window 25 may be made of tempered glass window. The monitoring element 26 may be a camera element, etc., and the thickness of the oil absorption expansion packing layer 24 can be monitored through the observation window 25. The management personnel can also observe the thickness of the oil absorption expansion packing layer 24 through the observation window 25. Before the oil absorption, the thickness of the oil absorption expansion packing layer 24 is small and does not fill the inner cavity of the oil absorption cylinder 23. During the oil absorption process, the oil absorption expansion packing layer 24 gradually expands and increases in thickness. When the thickness of the oil absorption expansion packing layer 24 reaches the set value, the oil absorption expansion packing layer 24 can be replaced. The thickness of the oil absorption expansion packing layer 24 after the oil absorption reaches saturation can be determined through experiments, and this thickness is the set thickness.

[0044] The present invention uses a material that expands after absorbing oil to absorb oil, and monitors the thickness of the oil-absorbing expansion filler layer 24 in real time, so as to accurately grasp the timing of replacing the oil-absorbing expansion filler layer 24, avoid premature replacement resulting in failure to fully utilize the oil-absorbing material, and prevent the oil-absorbing material from being replaced in time after reaching saturation, thereby ensuring the oil removal effect.

[0045] In the present invention, a detachable top cover 27 is provided on the top of the oil removal tank 3, and the top cover 27 can seal the oil removal tank 3 to prevent external impurities from falling into the oil removal tank 3. Since the oil absorption expansion packing layer 24 is usually made of a material with low density and is easy to float to the water surface, in order to ensure that the oil absorption expansion packing layer 24 is immersed in water, the inner wall of the oil removal tank 3 is provided with a plurality of vertical guide grooves, and the outer wall of the oil suction cylinder 23 is provided with a plurality of vertical guide bosses, which are plugged 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 by screws, the internal oil absorption expansion packing layer 24 can be completely located in the water to ensure the oil absorption effect. When replacing the oil absorption expansion packing layer 24, remove the top cover 27, remove the oil suction cylinder 23, and install a new oil suction cylinder 23.

[0046] In the present invention, the oil-absorbing and expanding filler layer 24 is a carbon sponge layer. The carbon sponge has a good oil absorption effect and can discharge the absorbed oil by extrusion. The oil absorption effect is not affected after multiple extrusions and deformations. The carbon sponge can be reused to reduce the implementation cost.

[0047] In order to facilitate the deoiling of the oil absorption expansion packing layer 24, a horizontal deoiling groove 28 is arranged above the oil discharge pipe 10, and the oil suction cylinder 23 can be horizontally placed in the deoiling groove 28; a pressure plate 30 slidingly matched with the oil suction cylinder 23 is arranged in the oil suction cylinder 23, and the oil absorption expansion packing layer 24 is arranged below the pressure plate 30; a limiting ring plate 31 is arranged on 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 arranged at one end of the deoiling groove 28, and the bottom of the deoiling groove 28 is connected to the oil discharge pipe 10 through a vertical pipe. After the oil-absorbing expansion packing layer 24 reaches saturation, the oil-absorbing expansion packing layer 24 is placed horizontally in the de-oiling tank 28, and one end of the pressure plate 30 is arranged to face the pressure mechanism 32, and the other end is close to the inner wall of the de-oiling tank 28. The pressure mechanism 32 is used to push the pressure plate 30 to move toward the direction of the oil-absorbing expansion packing layer 24, so that the pressure plate 30 squeezes the oil-absorbing expansion packing layer 24, squeezes out the oil absorbed by the oil-absorbing expansion packing layer 24, and the oil enters the de-oiling tank 28, and enters the oil drain pipe 10 along the vertical pipeline, and finally flows into the oil collecting tank 11 along the oil drain pipe 10, so as to realize oil recovery. After the de-oiling is completed, the pressure mechanism 32 is reset, and the oil absorption component can be used again. The present invention can realize de-oiling without taking out the oil-absorbing expansion packing layer 24, and the operation is more convenient.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. The wastewater treatment system of the machining workshop is characterized by: The invention comprises 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 provided with a wastewater delivery pipe (8), and a demulsifier adding mechanism (9) is provided on the wastewater delivery pipe (8); an oil discharge pipe (10) is provided on the upper side wall of the sedimentation tank (1), and the oil discharge pipe (10) is connected to an oil collecting tank (11); a first slag discharge mechanism (11) is provided 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 a filter assembly (12) is arranged in 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 absorption assembly is arranged in the oil removal tank (3), a cathode electrode (13) and an anode electrode (14) are arranged in the electrocatalytic oxidation tank (4), and an ozone inlet (15) is arranged at the bottom of the electrocatalytic oxidation tank (4).

2. The machining workshop wastewater treatment system according to claim 1, characterized in that: A separation cylinder (16) is arranged at the center of the oil collecting tank (11), a separation chamber is provided between the separation cylinder (16) and the oil collecting tank (11), the bottom of the inner chamber of the separation cylinder (16) is communicated with the bottom of the separation chamber, a calcium oxide adding mechanism (17) is arranged above the separation chamber, a second slag discharge mechanism (18) is arranged at the bottom of the separation chamber, and the second slag discharge mechanism (18) is connected to the wastewater conveying pipe (8); an oil discharge mechanism (19) is arranged at the top of the inner chamber of the separation cylinder (16); and the oil discharge pipe (10) is communicated with the upper part of the oil collecting tank (11).

3. The machining workshop wastewater treatment system according to claim 2, characterized in that: The calcium oxide adding mechanism (17) comprises a truncated cone-shaped storage hopper (171), a feeding channel (172) is arranged at the bottom of the storage hopper (171), a vertical feeding shaft (173) is arranged 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), and the lower end of the feeding shaft (173) extends to the bottom of the feeding channel (172) and is fixedly connected to the motor (174). A material receiving barrel (175) is connected, a spiral conveying sheet (176) is arranged on the outer wall of the material discharge shaft (173), a material shifting rod (177) fixedly connected to the material discharge shaft (173) is arranged in the storage hopper (171), the material receiving barrel (175) is connected to an inclined material conveying pipe (178), a plurality of vertical material feeding and stirring pipes (179) are connected to the bottom of the material discharge pipe (178), and the lower ends of the material feeding and stirring pipes (179) extend into the separation chamber.

4. The machining workshop wastewater treatment system according to claim 3, characterized in that: A cover plate (21) is arranged on the top of the separation cylinder (16), a bracket (22) is arranged on the cover plate (21), and 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 mounted on the cover plate (21), the oil discharge pump is connected to an oil suction pipe, and the oil suction pipe passes through the cover plate (21) and extends into the separation cylinder (16).

5. The machining workshop wastewater treatment system according to claim 2, characterized in that: The oil suction assembly comprises a transparent oil suction cylinder (23), the bottom wall, side wall and top wall of the oil suction cylinder (23) are all provided with a plurality of water holes, an oil absorption 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), and a monitoring element (26) for monitoring the thickness of the oil absorption expansion packing layer (24) is provided outside the observation window (25).

6. The machining workshop wastewater treatment system according to claim 5, characterized in that: A detachable top cover (27) is provided on the top of the deoiling tank (3).

7. The machining workshop wastewater treatment system according to claim 5, characterized in that: The inner wall of the oil removal tank (3) is provided with a plurality of vertical guide grooves, and the outer wall of the oil suction cylinder (23) is provided with a plurality of 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.

8. The machining workshop wastewater treatment system according to claim 5, characterized in that: The oil-absorbing and swelling filler layer (24) is a carbon sponge layer.

9. The machining workshop wastewater treatment system according to claim 5, characterized in that: A horizontal de-oiling groove (28) is arranged above the oil discharge pipe (10), and the oil suction cylinder (23) can be placed horizontally in the de-oiling groove (28); a pressure plate (30) that slides with the oil suction cylinder (23) is arranged inside the oil suction cylinder (23), and the oil absorption expansion filler layer (24) is arranged below the pressure plate (30); a limiting ring plate (31) is arranged on 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 arranged at one end of the de-oiling groove (28), and the bottom of the de-oiling groove (28) is connected to the oil discharge pipe (10) through a vertical pipeline.

10. The machining workshop wastewater treatment system according to claim 1, characterized in that: The filter assembly (12) comprises a support plate (121) and a plurality of filter cartridges (122), wherein the filter cartridge (122) comprises a cartridge body and a cartridge bottom, the upper end of the filter cartridge (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), and the upper end of each filter cartridge (122) can be detachably mounted in a 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), and when the rotating shaft (123) is rotated, the sealing cover (125) can be moved to any mounting hole.

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