A treatment process and apparatus for high-concentration organic wastewater containing oil and slag.

Abstract

This invention relates to the field of wastewater treatment technology, specifically a treatment process and apparatus for high-concentration organic wastewater containing oil and slag; it includes an oil extraction machine; the oil extraction machine includes a tank and a support at the bottom of the tank; a central column is fixedly connected to the center of the tank; a first half-pipe and a second half-pipe are fixedly connected to the lower part of the arc-shaped outer wall of the central column; one end of the first half-pipe and the second half-pipe are adjacent and communicate with the inside of the tank; the other end of the first half-pipe is connected to the bottom of the tank; the other end of the first half-pipe is connected to an air pump on the outside of the tank; this invention balances the number of spiral plate turns between the rotor and the first half-pipe based on the fiber and oil droplet content in the clear liquid, so that the path length of the spiral flow channel is adapted to the state of the clear liquid, thereby improving the treatment efficiency while ensuring the removal effect of fibers and oil droplets in the clear liquid; in addition, this invention can also reduce the overall height of the oil extraction machine, making it easier to transport.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically a treatment process and apparatus for high-concentration organic wastewater containing oil and slag. Background Technology

[0002] Palm oil production involves steaming palm fruits at high temperatures, then crushing and pressing them to separate the residue from the water. The separated kernels are further processed, while the separated residue fibers are burned as biomass fuel to provide electricity and heat for palm oil production. The oil-containing aqueous phase is then separated into oil, water, and residue. The residue is used to produce organic fertilizer or feed protein, and the oil phase is further separated and sold as crude oil to oil and fat processing enterprises for further processing. The aqueous phase still contains 0.4-1% oil, sometimes as high as 4%. The current treatment process for this oily wastewater is to directly flow into the oxidation pond of the downstream sewage treatment system through a simple oil-water separation tank for natural degradation and discharge into the water body, or to discharge it after anaerobic and aerobic treatment to meet standards.

[0003] In the food waste industry, the conventional food waste treatment process is to crush and screen the food waste, heat the liquid phase to about 80°C, and then put it into a centrifuge. The wastewater after centrifugation has a COD of more than 70,000 mg / L and an oil content of more than 3,000 mg / L. This wastewater is discharged into the sewage treatment system for anaerobic and aerobic treatment, and then further treated to meet the discharge standards.

[0004] Because the wastewater entering the sewage treatment system has too high levels of suspended solids (SS), carbon dioxide (COD), grease, and total nitrogen, the sewage treatment system has difficulty digesting all of it, making sewage treatment extremely difficult. Due to the high COD content, the biogas production is very large. However, since the system cannot use all of the biogas produced, it can only be burned and then released into the air, which wastes energy and causes great damage to the environment.

[0005] The clarified liquid formed after wastewater filtration needs to undergo flotation treatment. Specifically, an oil lifter is used to float fibers and oil droplets in the clarified liquid to the surface using microbubbles. The floated fibers, oil droplets, and particulate matter are then collected. Existing vertical oil lifters are hollow inside and have a fixed overall height. Microbubbles are released and float to the surface at the bottom of the lifter's tank, resulting in a constant overall path for the microbubbles. For clarified liquids with a high fiber and oil droplet content, a path that is too short will affect the treatment effect of fibers and oil droplets. Conversely, for clarified liquids with a low fiber and oil droplet content, a path that is too long will affect the treatment efficiency. Therefore, existing oil lifters cannot balance this aspect. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies, this invention proposes a treatment process and apparatus for high-concentration organic wastewater containing oil and slag. This invention balances the number of spiral plate turns between the rotor and the first half-pipe based on the fiber and oil droplet content in the clear liquid, so that the path length of the spiral flow channel is adapted to the state of the clear liquid, thereby improving the treatment efficiency while ensuring the removal effect of fibers and oil droplets in the clear liquid. In addition, this invention can also reduce the overall height of the oil extraction machine, making it easier to transport.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: A treatment device for high-concentration organic wastewater containing oil and slag, comprising an oil extraction machine; the oil extraction machine includes a tank and a support at the bottom of the tank; a central column is fixedly connected to the center of the tank; a first half-pipe and a second half-pipe are fixedly connected to the lower part of the arc-shaped outer wall of the central column; one end of the first half-pipe and the second half-pipe are adjacent and communicate with the inside of the tank; the other end of the first half-pipe communicates with the bottom of the tank; the other end of the second half-pipe is connected to an air pump on the outside of the tank; the outer wall of the central column and the inner wall of the tank are movable. A flexible spiral plate is connected; sealing strips are fixed to both the inner and outer edges of the spiral plate; a first motor is embedded at the upper end of the central column; a rotating block is fixed to the output end of the first motor; the arc-shaped outer wall of the rotating block is rotatably connected to a rotating rod fixed to the spiral plate; a second motor with a disc-shaped strip is fixed to the inner wall of the top of the tank; a collection groove corresponding to the disc-shaped strip is provided through the outer wall of the tank; the collection groove is covered by a collection box with a collection connector; an inlet connector with a liquid pump is provided connecting the inner and outer walls of the tank; the inlet connector is lower than the collection groove in the vertical direction.

[0008] Preferably, the upper end of the tank is open; the first half-pipe and the second half-pipe are combined to form a complete pipe; the outer sides of the first half-pipe and the second half-pipe are rotatably sealed to a sleeve; and the outer wall of the sleeve is provided with an air nozzle connected to the second half-pipe.

[0009] Preferably, the depth of the collection box is set to decrease as it moves away from the collection connector.

[0010] Preferably, a baffle is uniformly fixed to the lower surface of the spiral plate along the spiral direction; one end of the baffle is close to and in contact with the central column, and the other end is close to the inner wall of the tank and in contact with the tank.

[0011] Preferably, the baffle is made of an elastic material and has an expansion cavity inside; the spiral plate has a first air hole inside; and all the expansion cavities are connected through the first air hole.

[0012] Preferably, an anti-clogging shell is uniformly fixed to the upper surface of the spiral plate along the spiral plate; the anti-clogging shell is inverted U-shaped and its opening faces the spiral direction of the spiral plate; the position of the anti-clogging shell corresponds one-to-one with the position of the baffle.

[0013] Preferably, the expansion cavity is provided with a plurality of elastic ropes; the plurality of elastic ropes are distributed at intervals along the length direction of the baffle; one end of the elastic rope is connected to the spiral plate and the other end is connected to the inner wall of the expansion cavity.

[0014] Preferably, the medium filling the expansion chamber is a liquid medium; the density of the liquid medium is greater than the density of the clear liquid.

[0015] Preferably, the central column is composed of an upper column and a lower column; the upper column and the lower column are connected by an electric push rod; the upper column is connected to a first motor; and the lower column is fixedly connected to the center of the bottom wall of the tank.

[0016] A treatment process for high-concentration organic wastewater containing oil and slag, applicable to the aforementioned treatment device for such wastewater, comprises the following steps:

[0017] S1: The oily and slag-containing high-concentration organic wastewater from the upstream pump first passes through a thickener to extract slag and thick slurry. The slag is outsourced for processing as biomass fuel or fertilizer raw material. The thick slurry enters the thickener tank. The clear liquid filtered out by the thickener enters the oil extractor. In the oil extractor, fibers and oil droplets float to the surface under the action of microbubbles. The floating fibers, oil droplets and particulate matter are further concentrated and collected and enter the thickener tank.

[0018] S2: The clear liquid flowing out of the oil extractor is sent to the concentration tank, and then pumped into the thickener for further filtration. The clear liquid that passes through the filter membrane is sent to the sewage treatment system for further treatment as system effluent. Oil, fiber and particulate matter are further concentrated. Part of it enters the slurry tank and part of it flows back to the thickener for further concentration and oil extraction.

[0019] S3: The concentrated slurry in the slurry tank is pumped into the oil separator for the separation of oil, water and sludge. The oil is sold as a product, the separated wet sludge is processed outsourced as feed raw material or bio-fertilizer raw material, and the aqueous phase is returned to the front end of the oil extraction machine.

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

[0021] 1. This invention balances the number of spiral plate turns between the rotor and the first half-pipe based on the fiber and oil droplet content in the clear liquid, so that the path length of the spiral flow channel is adapted to the state of the clear liquid, thereby improving the processing efficiency while ensuring the removal effect of fibers and oil droplets in the clear liquid; in addition, this invention can also reduce the overall height of the oil extraction machine, making it easier to transport.

[0022] 2. During the pressurization process of the expansion cavity inside the baffle below the first half-tube, the medium inside the expansion cavity below the first half-tube will enter the expansion cavity above the first half-tube along the first air hole, thereby causing the expansion cavity above the first half-tube to expand. This causes the baffle above the first half-tube to expand as the spiral spacing of the spiral plate increases, thus ensuring the baffle's shielding effect on the expanded spiral flow channel.

[0023] 3. The corrugated baffle of the present invention has a crest position and a trough position. The trough position is the position close to the elastic rope. When the gas flowing from bottom to top along the spiral channel passes over the baffle, the baffle has multiple troughs, so the gas flowing from bottom to top along the spiral channel can be diverted. In this way, the gas can be evenly dispersed in the radial direction of the tank, further improving the contact effect with the clear liquid in the spiral channel. Attached Figure Description

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

[0025] Figure 1 This is a perspective view of the oil extraction machine in this invention;

[0026] Figure 2 yes Figure 1 A stereoscopic view from another angle;

[0027] Figure 3 This is a partial sectional view of the oil extraction machine in this invention;

[0028] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0029] Figure 5 yes Figure 3 Enlarged view of point B in the middle;

[0030] Figure 6 This is a three-dimensional view of the central column in this invention;

[0031] Figure 7 This is a cross-sectional view of the first half-pipe, the second half-pipe, and the sleeve in this invention;

[0032] Figure 8 This is a perspective view of the anti-clogging shell in this invention;

[0033] Figure 9 This is a perspective view of the baffle strip in this invention;

[0034] Figure 10 This is a flowchart of the process flow in this invention;

[0035] Figure 11 This is a schematic diagram of the process flow in this invention.

[0036] In the diagram: Tank 1, Collection Tank 11, Collection Box 12, Collection Connector 13, Liquid Inlet Connector 14, Liquid Pump 15, Support 2, Central Column 3, First Half-Pipe 31, Second Half-Pipe 32, Air Pump 33, Pipe Sleeve 34, Air Nozzle 35, Upper Column 36, Lower Column 37, Electric Push Rod 38, Spiral Plate 4, Sealing Strip 41, Baffle Strip 42, Expansion Chamber 43, First Air Hole 44, Anti-clogging Shell 45, Elastic Rope 46, First Motor 5, Rotating Block 51, Rotating Rod 52, Second Motor 6, Disc Strip 61. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0038] like Figures 1 to 11 As shown, the present invention includes the following embodiments:

[0039] Example 1: A treatment device for high-concentration organic wastewater containing oil and slag, comprising an oil extraction machine; the oil extraction machine includes a tank 1 and a support 2 at the bottom of the tank 1; a central column 3 is fixedly connected to the center of the tank 1; a first half-pipe 31 and a second half-pipe 32 are fixedly connected to the lower part of the arc-shaped outer wall of the central column 3; one end of the first half-pipe 31 and the second half-pipe 32 are arranged adjacently and communicate with the inside of the tank 1; the other end of the first half-pipe 31 communicates with the bottom of the tank 1; the other end of the second half-pipe 32 is connected to an air pump 33 on the outside of the tank 1; an elastic spiral plate 4 is movably connected between the outer wall of the central column 3 and the inner wall of the tank 1; the spiral plate 4... Sealing strips 41 are fixedly connected to both the inner and outer edges of the tank; a first motor 5 is embedded in the upper end of the central column 3; a rotating block 51 is fixedly connected to the output end of the first motor 5; the arc-shaped outer wall of the rotating block 51 is rotatably connected to a rotating rod 52 fixedly connected to the spiral plate 4; a second motor 6 with a disc-shaped strip 61 is fixedly connected to the inner wall of the top of the tank 1; a collection groove 11 corresponding to the disc-shaped strip 61 is provided through the inner wall of the tank 1 facing outward; the collection groove 11 is covered by a collection box 12 with a ring and a collection connector 13; a liquid inlet connector 14 with a liquid pump 15 is provided connecting the inner and outer walls of the tank 1; the liquid inlet connector 14 is lower than the collection groove 11 in the vertical direction.

[0040] Connect the inlet connector 14 and the first half-pipe 31 in the oil extraction machine to the corresponding pipes. The thickener will draw the filtered clear liquid into the inlet connector 14 along the corresponding pipe. Under the action of the pump 15, the clear liquid will enter the inner side of the tank 1 along the inlet connector 14. The inner edge of the spiral plate 4 is in sealed contact with the outer wall of the central column 3 through the corresponding sealing strip 41, and the outer edge of the spiral plate 4 is in sealed contact with the inner wall of the tank 1 through the corresponding sealing strip 41. A seal will be formed between the spiral plate 4, the inner wall of the tank 1, and the outer wall of the central column 3. In the spiral flow channel, after the clear liquid enters the inner side of the tank 1, it flows downwards along the spiral flow channel. The clear liquid enters at one end of the first half-pipe 31 and flows out at the other end, thus forming a complete clear liquid flow channel. The liquid level in the tank 1 is adapted to the height of the collection tank 11. As the clear liquid flows inside the tank 1, the air pump 33 will work, and the air pump 33 will discharge gas along the second half-pipe 32. The gas will flow upwards along the spiral flow channel, and the gas flow direction is the same as the clear liquid flow. In the opposite direction, efficient contact between the liquid and gas is achieved. The density of fibers and oil droplets in the liquid is less than that of water, causing them to float under the influence of the gas. The second motor 6 drives the disc-shaped bar 61 to rotate. The disc-shaped bar 61 is shaped like a "mosquito coil". The reverse scraping action of the disc-shaped bar 61 causes the fibers and oil droplets to be scraped away from the center of the tank 1 outwards. The fibers and oil droplets flow from the collection tank 11 and fall into the collection box 12. The fibers and oil droplets in the collection box 12 are then collected. Oil droplets will flow along the collection connector 13 into the corresponding pipe and finally into the thickening tank; while the clear liquid flowing out from the first half-pipe 31 will enter the concentration tank; the liquid inlet connector 14 will continuously feed liquid, the first half-pipe 31 will continuously discharge liquid, the air pump 33 will control the second half-pipe 32 to continuously feed air, and the disc strip 61 will continuously scrape away the fibers and oil droplets in the tank 1. The disc strip 61 can be replaced by some scrapers that move back and forth horizontally along the radial direction of the tank 1, as long as they can complete the removal and collection of fibers and oil droplets.Sensors are installed inside the liquid inlet connector 14 or the tank 1 to monitor the fiber and oil droplet content in the clear liquid inside the tank 1. The first motor 5 operates according to the fiber and oil droplet content in the clear liquid. The first motor 5 drives the rotating block 51 to rotate. During the rotation of the rotating block 51, the spiral plate 4 connected to the rotating rod 52 rotates around the central column 3. The ends of the first half-pipe 31 and the second half-pipe 32 located inside the tank 1 are engaged in the spiral flow channel of the spiral plate 4. Thus, during the rotation of the spiral plate 4 around the central column 3, the spiral plate 4 moves with the first half-pipe 31 and the second half-pipe 32, thereby changing the number of turns of the spiral plate 4 between the rotating rod 52 and the first half-pipe 31. The more turns of the spiral plates 4 between the first half-tube 31, the longer the spiral flow path between the rotor 52 and the first half-tube 31 will be, and vice versa. A longer spiral flow path between the rotor 52 and the first half-tube 31 is not necessarily better, as it takes longer, but a shorter spiral flow path is also not necessarily better, as it results in poorer removal of fibers and oil droplets from the liquid by the gas. Therefore, the number of turns of the spiral plates 4 between the rotor 52 and the first half-tube 31 is balanced according to the fiber and oil droplet content in the liquid, so that the path length of the spiral flow path is adapted to the state of the liquid, improving processing efficiency while ensuring the removal of fibers and oil droplets from the liquid. In addition, this invention can also reduce the overall height of the oil extraction machine, facilitating transportation.

[0041] Example 2: The upper end of the tank body 1 is open; the first half-pipe 31 and the second half-pipe 32 are combined to form a whole pipe; the outer sides of the first half-pipe 31 and the second half-pipe 32 are rotatably sealed to the sleeve 34; the outer wall of the sleeve 34 is provided with a jet nozzle 35 connected to the second half-pipe 32.

[0042] In this embodiment, the depth of the collection box 12 is set to decrease as it moves away from the collection connector 13.

[0043] Since the outer walls of the first half-tube 31 and the second half-tube 32 are rotatably sealed to the sleeve 34, during the movement of the spiral plate 4 with the first half-tube 31 and the second half-tube 32, the spiral plate 4 will move with the sleeve 34. During the frictional contact between the spiral plate 4 and the sleeve 34, the sleeve 34 will rotate on the outer walls of the first half-tube 31 and the second half-tube 32. The sleeve 34 reduces the friction between the first half-tube 31, the second half-tube 32 and the spiral plate 4, thus protecting the spiral plate 4, the first half-tube 31 and the second half-tube 32. The outer wall of the sleeve is provided with a jet nozzle 35, which disperses the airflow ejected from the jet nozzle 35 by the air pump 33 and forms microbubbles, increasing the contact area between the gas and the fibers and oil droplets in the clear liquid. After the disc strip 61 scrapes the fibers and oil droplets into the collection box 12, the fibers and oil droplets in the collection box 12 will converge along the inner bottom wall toward the collection connector 13 to ensure the collection effect of fibers and oil droplets.

[0044] Example 3: A baffle 42 is uniformly fixed to the lower surface of the spiral plate 4 along the spiral direction; one end of the baffle 42 is close to and in contact with the central column 3, and the other end is close to and in contact with the inner wall of the tank 1.

[0045] In this embodiment, the baffle 42 is made of elastic material and has an expansion cavity 43 inside; the spiral plate 4 has a first air hole 44 inside; all the expansion cavities 43 are connected through the first air hole 44.

[0046] When gas is discharged from the second half-pipe 32, the gas flows upward along the spiral channel. Since the lower surface of the spiral plate 4 is fixedly connected to the baffle 42 along the spiral direction, the gas needs to pass over the baffle 42 as it flows along the spiral channel. During this process, the gas moves from the upper part of the spiral channel to the lower part, thus dispersing the gas flowing upward in the spiral channel and preventing it from flowing too close to the upper part of the spiral channel. This ensures effective contact between the gas and the fibers and oil droplets in the clear liquid. The baffle 42 is made of an elastic material, such as rubber. Therefore, when the spiral plate 4 below the first half-pipe 31 is folded up, the baffle 42 below the first half-pipe 31 will be compressed and flattened, thus preventing the baffle 42 from... The mechanism influences the collapse of the spiral plate 4. During the compression process, the medium inside the expansion cavity 43 of the baffle 42 below the first half-tube 31, under pressure, enters the expansion cavity 43 above the first half-tube 31 along the first air hole 44, causing the expansion cavity 43 above the first half-tube 31 to expand. This causes the baffle 42 above the first half-tube 31 to expand as the spiral spacing of the spiral plate 4 increases, thus ensuring the baffle 42's shielding effect on the expanded spiral flow channel. Similarly, when the number of turns of the spiral plate 4 below the first half-tube 31 decreases, the expansion cavity 43 on the unfolded spiral plate 4 will return to its expanded state. In this embodiment, since the baffle 42 can deflate and recover, it can smoothly pass through the first half-tube 31 and the second half-tube 32.

[0047] Example 4: An anti-blocking shell 45 is uniformly fixed to the upper surface of the spiral plate 4 along the spiral plate 4; the anti-blocking shell 45 is inverted U-shaped and the opening faces the spiral direction of the spiral plate 4; the position of the anti-blocking shell 45 corresponds one-to-one with the position of the baffle 42.

[0048] An anti-clogging shell 45 is provided on the upper surface of the spiral plate 4, which corresponds one-to-one with the baffle 42. This ensures that the baffle 42 will not be tightly attached to the lower part of the spiral flow channel after expansion, thus ensuring that there is a flow gap between the expanded baffle 42 and the lower part of the spiral flow channel. The gas will flow through the anti-clogging shell 45. The anti-clogging shell 45 is flat and will not affect the collapse of the spiral plate 4.

[0049] Example 5: The expansion cavity 43 is provided with a plurality of elastic ropes 46; the plurality of elastic ropes 46 are distributed at intervals along the length direction of the baffle 42; one end of the elastic rope 46 is connected to the spiral plate 4, and the other end is connected to the inner wall of the expansion cavity 43.

[0050] Since the inner wall of the expansion chamber 43 is connected to the spiral plate 4 by elastic ropes 46, during the expansion process of the medium entering the expansion chamber 43, the baffle 42 will expand. As the internal space of the expansion chamber 43 increases, it will pull the elastic ropes 46. The elastic ropes 46 will exert a reaction force on the inner wall of the expansion chamber 43. Thus, the expansion chamber 43 needs to overcome the tension of the elastic ropes 46 during the expansion process. The multiple elastic ropes 46 in the expansion chamber 43 are distributed at intervals along the length of the baffle 42. Therefore, the expansion degree is less at the positions on the inner wall of the expansion chamber 43 where the elastic ropes 46 are pulling than at other positions. This makes the baffle 42 expand more effectively. The expansion of the outer wall of the baffle 42 at the position corresponding to the tension of the elastic rope 46 is less than that at other positions. This makes the shape of the lower part of the baffle 42 corrugated in the length direction. The corrugated baffle 42 has crests and troughs. The troughs are the positions close to the elastic rope 46. When the gas flowing from bottom to top along the spiral channel passes over the baffle 42, the baffle 42 has multiple troughs, which can divert the gas flowing from bottom to top along the spiral channel. In this way, the gas can be evenly dispersed in the radial direction of the tank 1, further improving the contact effect with the clear liquid in the spiral channel.

[0051] Example 6: The medium filled in the expansion chamber 43 is a liquid medium; the density of the liquid medium is greater than the density of the clear liquid.

[0052] Since the expansion chamber 43 is filled with a liquid medium, and the density of the liquid medium is greater than that of the clear liquid, the baffle 42 will droop when the liquid medium enters the expansion chamber 43. Compared with the expansion chamber 43 being filled with a gas medium, this greatly improves the interception effect of the baffle 42 on the gas in the spiral flow channel, so that the gas needs to pass over the lower baffle 42 to move upward, which further improves the contact effect between the gas and the clear liquid in the spiral flow channel.

[0053] Example 7: The central column 3 is composed of an upper column 36 and a lower column 37; the upper column 36 and the lower column 37 are connected by an electric push rod 38; the upper column 36 is connected to the first motor 5; the lower column 37 is fixedly connected to the center of the inner bottom wall of the tank 1.

[0054] As the clear liquid flows from top to bottom along the spiral channel, the gas flows from bottom to top along the spiral channel, carrying away the fibers and oil droplets in the clear liquid. During this process, the electric push rod 38 will extend and retract cyclically, causing the upper column 36 to move slightly up and down relative to the lower column 37 frequently. This causes the first motor 5 to drive the rotating block 51 to move frequently up and down. The rotating block 51 will drive the rotating rod 52, that is, the upper end of the spiral plate 4, to move slightly up and down. This causes the spiral plate 4 to vibrate in the vertical direction. During the vertical vibration of the spiral plate 4, it will be transmitted to the baffle 42, causing the baffle 42 to vibrate back and forth. During the back and forth vibration of the baffle 42, it will deform. Thus, the gas, fibers and oil droplets remaining at the angle between the baffle 42 and the lower surface of the spiral plate 4 are easily pushed away by the deformed baffle 42. The fibers and oil droplets on the lower surface of the spiral plate 4 are also less likely to remain under the action of vibration.

[0055] Example 8: A treatment process for high-concentration organic wastewater containing oil and slag. This process is applicable to the above-mentioned treatment device for high-concentration organic wastewater containing oil and slag. The steps of this process are as follows:

[0056] S1: The oily and slag-containing high-concentration organic wastewater from the upstream pump first passes through a thickener to extract slag and thick slurry. The slag is outsourced for processing as biomass fuel or fertilizer raw material. The thick slurry enters the thickener tank. The clear liquid filtered out by the thickener enters the oil extractor. In the oil extractor, fibers and oil droplets float to the surface under the action of microbubbles. The floating fibers, oil droplets and particulate matter are further concentrated and collected and enter the thickener tank.

[0057] S2: The clear liquid flowing out of the oil extractor is sent to the concentration tank, and then pumped into the thickener for further filtration. The clear liquid that passes through the filter membrane is sent to the sewage treatment system for further treatment as system effluent. Oil, fiber and particulate matter are further concentrated. Part of it enters the slurry tank and part of it flows back to the thickener for further concentration and oil extraction.

[0058] S3: The concentrated slurry in the slurry tank is pumped into the oil separator for the separation of oil, water and sludge. The oil is sold as a product, the separated wet sludge is processed outsourced as feed raw material or bio-fertilizer raw material, and the aqueous phase is returned to the front end of the oil extraction machine.

[0059] The treatment device for this high-concentration, oily, and sludge-containing organic wastewater includes an oil extraction machine, as well as a thickener, a separator, a pump, and a storage tank. The system effluent from this high-concentration, oily, and sludge-containing organic wastewater exhibits significantly reduced suspended solids (SS) and oil content, as well as significantly reduced COD, ammonia nitrogen, total nitrogen, and total phosphorus content. This wastewater can be further treated by anaerobic / aerobic processes (or oxidation ponds) to meet discharge standards and can even undergo zero-discharge treatment. This invention improves the process for the resource utilization of high-concentration, oily wastewater, thereby maximizing the extraction of oil from palm oil wastewater and oily wastewater from centrifuged kitchen waste (including but not limited to the two types of oily wastewater mentioned above). Resource utilization of wet residue after oil extraction (as feed or fertilizer); the new process, adhering to the principles of thorough harmlessness, significant volume reduction, and full resource utilization, extracts oil, fiber-rich, protein-rich, and other particulate organic components from the incoming water before it enters the wastewater treatment system. This reduces the SS and oil content in the wastewater entering the system by more than 90%, and significantly reduces COD, ammonia nitrogen, total nitrogen, and total phosphorus. The biodegradability of the wastewater is greatly optimized, further reducing the difficulty of wastewater treatment. The biogas produced by the wastewater treatment can be burned to produce steam or used to generate electricity for reuse in production equipment, achieving thorough harmlessness, significant volume reduction, and full resource utilization.

[0060] Example 9:

[0061] A slurry thickener is a mechanical filtration device, mainly composed of a transmission device, an overflow weir distributor, and a flushing water system. Its working principle involves the treated water entering the overflow weir distributor through a water pipe inlet. After a brief period of flow stabilization, the water overflows evenly from the outlet, distributing onto a counter-rotating drum. Solids are intercepted and separated, and discharged from the other end of the drum. Wastewater filtered from the drum flows away through a trough directly below. The machine is equipped with an external washing water pipe, using system water spray for rinsing and regeneration, ensuring the equipment maintains optimal performance without consuming tap water. Features include: simple structure, stable operation, convenient maintenance, long service life, and high processing capacity. With high capacity and efficiency, the fiber recovery rate of general wastewater is greater than 80%. It has a small footprint, low cost, low-speed operation, automatic protection, convenient installation, water and electricity saving, and fully automatic continuous operation without the need for special personnel. The fiber recovery concentration can reach more than 12%. It can separate wastewater into three states: large residue, thick slurry, and clear liquid. It can replace thickeners. The thickener is an existing technology. The specific structure will not be described in detail. The replacement structure includes external filter drum filter, low-pressure belt filter press, screw extrusion filter; even three different mesh sizes of filter screens can achieve the separation of large residue, thick slurry, and clear liquid.

[0062] Example 10:

[0063] A thickener is a device with special selective separation capabilities. It utilizes its unique materials and the sieving effect of its gaps to separate substances and highly concentrate the desired materials. Under pressure, the material flows at high speed within the tank chamber under pressure. As the material flows past the separation surface, small molecules pass through vertically, while large molecules are trapped and washed away, thus achieving separation and concentration. This thickener is highly efficient, energy-saving, environmentally friendly, and has filtration capabilities. No chemical reaction occurs during the separation process. Advantages include clear and transparent filtrate, high product quality, and high product recovery rate; a wide temperature range for concentration, usable from low to high temperatures; no phase change during separation, enabling water / oil separation, purification, desalination, decolorization, dealcoholization, and concentration; stable process with high batch-to-batch repeatability. The equipment boasts a high degree of automation, low energy consumption and operating costs, and is easy to control and maintain, thereby improving production efficiency and reducing labor intensity. It also reduces environmental pollution and lightens the load on subsequent processes. It is widely used in petrochemical, pharmaceutical, food, biological products, health products, blood products, enzyme preparations, and cosmetics industries. The thickener operates in batch processing mode, continuously filtering and concentrating the feed liquid while constantly replenishing it with new liquid to maintain the feed tank level. After each batch of feed liquid is filtered, the membrane itself becomes contaminated. To restore membrane flux, it is cleaned with an alkaline or acidic (or other suitable) cleaning agent for reuse. The thickener is a microfiltration / ultrafiltration membrane thickener, which can be replaced by equipment such as disc centrifuge thickeners. Other thickening equipment is also feasible. The thickener is existing technology, and its specific structure will not be described in detail.

[0064] Example 11:

[0065] Before entering the oil extraction machine, the feed liquid needs to be pretreated to remove rigid particles to prevent scratches or blockages to the equipment. The feed liquid flows at high speed in the equipment through a circulating pump. Large particles are trapped by the pores, and the clarified feed liquid is collected through the pores. At the same time, part of the concentrated feed liquid is returned to the material tank for material balance. When the product content in the concentrated liquid in the system is lower than the process requirements or the concentration of the concentrated liquid meets the process requirements, the concentrated liquid is discharged or collected for the next process. After the system finishes production, the internal residue should be discharged immediately, and then the system should be rinsed with pure water until the material in the system is clean. After rinsing, the system should be chemically cleaned with acid / alkali / cleaning agent, and then rinsed with clean water until neutral. After draining the cleaning water from the system, the machine should be shut down for standby.

[0066] Example 12:

[0067] An oil separator is a device that uses centrifugal principle to separate materials of different properties. It is mainly used to achieve three-phase separation of light liquid phase, heavy liquid phase and solid phase; including but not limited to three-phase horizontal screw centrifuge, disc centrifuge and other structural forms. Through the centrifugal force field generated by high-speed rotation, materials of different densities are separated to achieve the purpose of separating oil, water and sludge in the material.

[0068] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be construed as indicating or implying relative importance.

[0069] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A treatment device for high-concentration organic wastewater containing oil and slag, comprising an oil extraction machine; characterized in that: The oil extraction machine includes a tank and a support at the bottom of the tank; a central column is fixedly connected to the center of the tank; a first half-pipe and a second half-pipe are fixedly connected to the lower part of the arc-shaped outer wall of the central column; one end of the first half-pipe and the second half-pipe are adjacent and communicate with the inside of the tank; the other end of the first half-pipe is connected to the bottom of the tank; the other end of the second half-pipe is connected to an air pump on the outside of the tank; an elastic spiral plate is movably connected between the outer wall of the central column and the inner wall of the tank; sealing strips are fixedly connected to the inner and outer edges of the spiral plate; a first motor is embedded in the upper part of the central column; a rotating block is fixedly connected to the output end of the first motor; a rotating rod fixedly connected to the spiral plate is rotatably connected to the arc-shaped outer wall of the rotating block; A second motor with a disc-shaped strip is fixed to the inner wall of the top of the tank; a collection groove corresponding to the disc-shaped strip is provided through the outer wall of the tank; the collection groove is covered by a collection box with a collection connector; an inlet connector with a liquid pump is provided between the inner and outer walls of the tank; the inlet connector is lower than the collection groove in the vertical direction; the first motor drives the rotating block to rotate, and during the rotation of the rotating block, it drives the spiral plate connected to the rotating rod to rotate around the central column. The first half-pipe and the second half-pipe are located at the inner side of the tank and are inserted into the spiral flow channel of the spiral plate. During the rotation of the spiral plate around the central column, the spiral plate will move with the first half-pipe and the second half-pipe, changing the number of spiral plate turns between the rotating rod and the first half-pipe; The lower surface of the spiral plate is uniformly fixed with baffles along the spiral direction; one end of the baffle is close to and in contact with the central column, and the other end is close to and in contact with the inner wall of the tank. The baffle is made of elastic material and has an expansion cavity inside; the spiral plate has a first air hole inside; all the expansion cavities are connected through the first air hole. The expansion chamber is equipped with multiple elastic ropes; the multiple elastic ropes are distributed at intervals along the length of the baffle; one end of each elastic rope is connected to a spiral plate, and the other end is connected to the inner wall of the expansion chamber; the shape of the lower part of the entire baffle is corrugated in the length direction. The expansion chamber is filled with a liquid medium; the density of the liquid medium is greater than that of the clear liquid.

2. The device for treating high-concentration organic wastewater containing oil and residue according to claim 1, characterized in that: The upper end of the tank is open; the first half-pipe and the second half-pipe are combined to form a complete pipe; the outer sides of the first half-pipe and the second half-pipe are rotatably sealed to a sleeve; the outer wall of the sleeve is provided with an air nozzle connected to the second half-pipe.

3. The device for treating high-concentration organic wastewater containing oil and residue according to claim 1, characterized in that: The depth of the collection box is set to decrease as it moves away from the collection connector.

4. The device for treating high-concentration organic wastewater containing oil and residue according to claim 1, characterized in that: The upper surface of the spiral plate is uniformly fixed with an anti-clogging shell along the spiral plate; the anti-clogging shell is inverted U-shaped and its opening faces the spiral direction of the spiral plate; the position of the anti-clogging shell corresponds one-to-one with the position of the baffle.

5. The device for treating high-concentration organic wastewater containing oil and residue according to claim 1, characterized in that: The central column is composed of an upper column and a lower column; the upper column and the lower column are connected by an electric push rod; the upper column is connected to a first motor; and the lower column is fixedly connected to the center of the bottom wall of the tank.

6. A treatment process for high-concentration organic wastewater containing oil and slag, the process being applicable to the treatment apparatus for high-concentration organic wastewater containing oil and slag as described in any one of claims 1-5, characterized in that: The steps of this process are as follows: S1: The oily and slag-containing high-concentration organic wastewater from the upstream pump first passes through a thickener to extract slag and thick slurry. The slag is outsourced for processing as biomass fuel or fertilizer raw material. The thick slurry enters the thickener tank. The clear liquid filtered out by the thickener enters the oil extractor. In the oil extractor, fibers and oil droplets float to the surface under the action of microbubbles. The floating fibers, oil droplets and particulate matter are further concentrated and collected and enter the thickener tank. S2: The clear liquid flowing out of the oil extractor is sent to the concentration tank, and then pumped into the concentration machine for further filtration. The clear liquid that passes through the filter membrane is sent to the sewage treatment system for further treatment as system effluent. Oil, fiber and particulate matter are further concentrated. Part of it enters the slurry tank and part of it flows back to the concentration tank for further concentration and oil extraction. S3: The concentrated slurry in the slurry tank is pumped into the oil separator for the separation of oil, water and sludge. The oil is sold as a product, the separated wet sludge is processed outsourced as feed raw material or bio-fertilizer raw material, and the aqueous phase is returned to the front end of the oil extraction machine.

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