Oil and gas removal integrated water treatment equipment

Abstract

The utility model discloses a kind of oil removal and air flotation integrated water treatment equipment, including water treatment processor, water inlet pipeline and water outlet pipeline are respectively arranged at the both ends of water treatment processor;Two baffle plates are arranged in water treatment processor, further include: oil removal device and air flotation device, are arranged in the area between water inlet pipeline and the baffle plate close to water inlet pipeline, oil removal device is used to remove part of oiliness in water inlet substance;Air flotation device is used to produce bubble to make impurity in water inlet float out;Scraping residue device is arranged in the area between two baffle plates, for removing the float dregs generated by air flotation.The integrated water treatment equipment significantly improves the removal efficiency of oiliness in high oil content wastewater, overcomes its interference to air flotation process, solves the fundamental problem of low treatment efficiency of traditional air flotation process;At the same time, by efficient built-in oil removal mechanism, reduce or eliminate the dependence on excessive chemical agent, thereby solve the problem of large amount of chemical agent consumption caused by low efficiency of traditional air flotation process.

Description

Technical Field

[0001] This utility model relates to an integrated water treatment equipment for oil removal and air flotation, belonging to the field of wastewater treatment technology. Background Technology

[0002] Industries such as petrochemicals, machinery manufacturing, and food processing generate large amounts of industrial wastewater containing high concentrations of oil and suspended solids (SS). Air flotation (AF) is a key technology for treating this type of wastewater due to its highly efficient solid-liquid separation capabilities. However, when the concentration of oil in the wastewater is too high, it significantly interferes with the core mechanism of the AF process: excessive oil droplets can encapsulate or competitively adsorb microbubbles, severely hindering the effective binding of bubbles and suspended pollutants, leading to a significant decrease in AF separation efficiency. The direct consequence of this low efficiency is that to achieve the necessary pollutant removal effect, the dosage of coagulants, flocculants, and other chemical agents must be significantly increased, significantly driving up operating costs. Even with increased agent dosage, the effluent quality still risks failing to meet standards, and system stability is reduced.

[0003] Currently used oil-water pretreatment methods (such as horizontal flow, inclined plate, and hydrocyclone separators) can remove some floating oil, but they generally suffer from poor removal of emulsified oil, insufficient separation efficiency for small oil droplets (<50μm), large footprint, and weak resistance to shock loads. The effluent often still contains high concentrations of dispersed and emulsified oil, failing to meet the requirements of subsequent air flotation processes for low oil content influent, and cannot effectively address the negative impact of high oil concentration on air flotation efficiency and reagent consumption.

[0004] Therefore, there is an urgent need to develop an integrated equipment for efficient oil removal and enhanced air flotation to significantly improve the treatment efficiency of oily wastewater and greatly reduce reagent consumption, providing an economical and reliable solution for highly polluted wastewater. Utility Model Content

[0005] The purpose of this invention is to provide an integrated oil removal and flotation water treatment device, which significantly improves the removal efficiency of oily substances in high-oil-content wastewater, overcomes their interference with the flotation process, and solves the fundamental problem of low treatment efficiency in traditional flotation processes. At the same time, through a highly efficient built-in oil removal mechanism, it reduces or eliminates the dependence on excessive chemical agents, thereby solving the problem of high agent consumption caused by low efficiency in traditional flotation processes.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] An integrated water treatment device for oil removal and flotation includes a water processor, with an inlet pipe and an outlet pipe at each end of the water processor.

[0008] The water processor is equipped with two partitions that block the upper or lower part of the cross-section of the water processor at the vertical height of the water processor, and the blocking heights of the two partitions are different.

[0009] The vertical height of the water inlet pipe is outside the obstruction height range of the partition near the water inlet pipe;

[0010] The vertical height of the water outlet pipe is within the obstruction height range of the partition near the water outlet pipe;

[0011] Also includes:

[0012] Both the oil removal device and the air flotation device are located in the area between the water inlet pipe and the partition near the water inlet pipe. The oil removal device is used to remove some oily substances from the water inlet; the air flotation device is used to generate air bubbles to make impurities in the water float to the surface.

[0013] The scum removal device, located in the area between two baffles, is used to remove the scum generated by air flotation.

[0014] Preferably, the oil removal device includes a motor installed on one side of the water processor, and rollers perpendicular to the water flow direction are installed on the motor's actuation shaft and inside the water processor, and the rollers inside the water processor are rotatably arranged relative to the water processor.

[0015] A belt is provided around the two rollers;

[0016] A waste oil tank is installed on the water processor located on one side of the upper roller, and a scraper structure is formed on the side of the waste oil tank that is close to the corresponding belt to scrape the oily substances adsorbed on the belt into the waste oil tank.

[0017] Preferably, the belt is made of an oleophilic and hydrophobic material.

[0018] Preferably, the air flotation device includes an air inlet pipe connected to an external air supply system and a dissolved air release device installed on the inner end of the air inlet pipe immersed in the water processor.

[0019] Preferably, the slag scraping device includes a slag scraper installed on the top of the processor and a slag trough installed on the inner side of the baffle near the water outlet pipe, with a slag scraper plate provided on the side of the slag trough near the slag scraper.

[0020] Preferably, the end of the slag trough extends outside the water processor.

[0021] Preferably, a liquid level plate is provided on the side wall of the water processor near the outlet pipe.

[0022] The beneficial effects of this utility model are as follows:

[0023] 1. Integrating oil separation pretreatment and air flotation process into the same equipment simplifies the process flow, reduces the floor space required, and lowers infrastructure costs;

[0024] 2. The belt (made of oleophilic and hydrophobic material) is used to dynamically adsorb oily substances. Compared with traditional oil separators, it can efficiently remove emulsified oil and tiny oil droplets (<50μm), reducing the interference of oil on the subsequent air flotation process.

[0025] 3. First, remove most of the oil through an oil removal device to reduce the competitive adsorption of oil droplets on the flocculant, so that the coagulant / flocculator can act on the suspended solids more efficiently and reduce the dosage of the agent.

[0026] 4. The wastewater after oil removal is more likely to combine with microbubbles, improving the utilization rate of bubbles and enhancing the stability of scum, thus ensuring stable effluent. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of an integrated oil removal and flotation water treatment equipment.

[0028] Figure 2 This is a schematic diagram of the oil removal device.

[0029] The meanings of the main reference numerals in the figure are as follows:

[0030] 1. Water processor, 2. Inlet pipe, 3. Outlet pipe, 4. Baffle, 5. Liquid level plate, 6. Motor, 7. Roller, 8. Belt, 9. Waste oil tank, 10. Air inlet pipe, 11. Dissolved gas release device, 12. Sludge scraper, 13. Sludge trough, 14. Sludge scraper plate. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] This embodiment provides an integrated water treatment device for oil removal and air flotation, such as... Figure 1-2 As shown, the system includes a water processor 1, with an inlet pipe 2 at its left end and an outlet pipe 3 at its right end. Two partitions 4 are installed inside the water processor 1, each partition 4 blocking the upper or lower part of the cross-section of the water processor 1 at a different vertical height. The vertical height of the inlet pipe 2 is outside the blocking height range of the partition 4 closest to it; the vertical height of the outlet pipe 3 is within the blocking height range of the partition 4 closest to it. To facilitate subsequent oil removal and sludge scraping, a liquid level plate 5 is installed on the side wall of the water processor 1 near the outlet pipe 3. The liquid level plate 5 has an L-shaped structure, with both ends connected to or tightly abutting against the side wall of the water processor 1. The overall liquid level inside the water processor 1 is controlled by adjusting the height of the liquid level plate 5.

[0033] The water processor 1 is also equipped with an oil removal device, an air flotation device, and a sludge scraping device; the oil removal device and the air flotation device are both located in the area between the water inlet pipe 2 and the partition 4 near the water inlet pipe 2 (reaction zone).

[0034] The oil removal device is used to remove some oily substances from the incoming water. It includes a motor 6 (clockwise rotation is forward rotation) installed on one side of the water processor 1. Rollers 7 perpendicular to the water flow direction are installed on the actuator shaft of the motor 6 and inside the water processor 1. The rollers 7 inside the water processor 1 are rotatably arranged relative to the water processor 1 (this can be achieved by symmetrically installing bearing seats with bearings inside the water processor 1, with both ends of the rollers 7 inserted into the corresponding bearing seats; similarly, one end of the upper roller 7 is connected to the actuator shaft of the motor 6, and the other end is rotatably supported by the bearing seat with bearings). A belt 8 is provided around the two rollers 7 (the width of the belt 8 should be as close as possible to the longitudinal width of the water processor 1). In practical applications, in order to prevent relative slippage between the belt 8 and the rollers 7, a strip-shaped protrusion is formed on the inner side of the belt 8, and a strip-shaped toothed groove is formed on the roller 7 for the protrusion to be inserted. A waste oil tank 9 is mounted on the water processor 1 located to the right of the upper roller 7, and a scraper structure is formed on the side of the waste oil tank 9 near the corresponding side belt 8 to scrape the oily substances adsorbed on the belt 8 into the waste oil tank 9. In order to improve the oil removal effect, the belt 8 is made of oleophilic and hydrophobic material, including but not limited to polyurethane, polypropylene, polycarbonate and other materials.

[0035] The air flotation device is used to generate bubbles to float impurities in the incoming water. It includes an air inlet pipe 10 (made of metal pipe to maintain structural stability, and erected if necessary) connected to an external air supply system and a dissolved air release device 11 installed on the inner end of the air inlet pipe 10 immersed in the water processor 1.

[0036] A scum removal device, located in the area (contact zone) between the two baffles 4, is used to remove scum generated by air flotation. It includes a scum scraper 12 mounted on top of the processor and a scum collection trough 13 mounted inside the baffle 4 near the outlet pipe 3. A scraper plate 14 is provided on the side of the scum collection trough 13 near the scraper 12. The end of the scum collection trough 13 extends outside the water processor 1. In practical applications, a collector can be installed at the bottom of the water processor 1 to recover the scraped scum.

[0037] Wastewater containing oil enters the reaction zone through the inlet pipe 2. Upon contact with the rotating belt 8, oily substances are selectively adsorbed. The belt 8 rotates clockwise driven by the motor 6, and under the action of the scraper, the oil film on the surface of the belt 8 is peeled off and collected in the waste oil tank 9 for centralized recovery. The pre-treated wastewater enters the contact zone, where the added coagulant / flocculator efficiently binds the remaining suspended solids. Simultaneously, microbubbles generated by the dissolved air release device 11 in the reaction zone intensify the buoyancy of the suspended solids (forming scum). The scum is then scraped into the scum collection tank 13 by the scraper 12 and recovered (the scraper 12 is existing technology and will not be described further here; during operation, the scraper plate 14 moves in the direction of the scraper plate 14). The de-oiled and de-sludge-removed water overflows into the area formed by the level plate 5 and the side wall of the water processor 1 and is finally discharged through the outlet pipe 3.

[0038] A company uses a combination of oil separator and air flotation processes to treat 100m³ of water per day. 3 The incoming water contains approximately 1500 mg / L of oil and 800 mg / L of suspended solids. After treatment, the oil concentration can reach 50-300 mg / L (standard ≤100 mg / L) and the suspended solids concentration can reach 50-200 mg / L (standard ≤400 mg / L). The effluent is unstable and may exceed the standards.

[0039] The integrated oil removal and flotation water treatment equipment provided in the embodiment uses polyurethane material for the belt and the belt motor speed is 0.5-1.2m / min.

[0040] Comparison of effluent quality before and after use: The introduction of the oil removal device significantly improves the removal efficiency of oily substances in high-oil-content wastewater, overcomes their interference with the air flotation process, and thus solves the fundamental problem of low treatment efficiency of traditional air flotation process, effectively improving the quality of effluent.

[0041]

[0042] Comparison of chemical consumption before and after use: This integrated equipment reduces or eliminates dependence on excessive chemical agents through a highly efficient built-in oil removal mechanism, thereby solving the problem of high chemical consumption caused by low efficiency in traditional air flotation processes.

[0043]

[0044] The above description is only a preferred embodiment of this utility model patent. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model patent, and these improvements and modifications should also be considered within the scope of protection of this utility model patent.

Claims

1. An integrated water treatment device for oil removal and air flotation, characterized in that, Includes a water processor, with an inlet pipe and an outlet pipe at each end; The water processor is equipped with two partitions that block the upper or lower part of the cross-section of the water processor at the vertical height of the water processor, and the blocking heights of the two partitions are different. The vertical height of the water inlet pipe is outside the obstruction height range of the partition near the water inlet pipe; The vertical height of the water outlet pipe is within the obstruction height range of the partition near the water outlet pipe; Also includes: Both the oil removal device and the air flotation device are located in the area between the water inlet pipe and the partition near the water inlet pipe. The oil removal device is used to remove some oily substances from the water inlet; the air flotation device is used to generate air bubbles to make impurities in the water float to the surface. The scum removal device, located in the area between two baffles, is used to remove the scum generated by air flotation.

2. The integrated oil removal and flotation water treatment equipment according to claim 1, characterized in that, The oil removal device includes a motor installed on one side of the water processor, and rollers perpendicular to the water flow direction are installed on the motor's actuation shaft and inside the water processor, with the rollers inside the water processor rotating relative to the water processor. A belt is provided around the two rollers; A waste oil tank is installed on the water processor located on one side of the upper roller, and a scraper structure is formed on the side of the waste oil tank that is close to the corresponding belt to scrape the oily substances adsorbed on the belt into the waste oil tank.

3. The integrated oil removal and flotation water treatment equipment according to claim 2, characterized in that, The belt is made of oleophilic and hydrophobic materials.

4. The integrated oil removal and flotation water treatment equipment according to claim 1, characterized in that, The air flotation device includes an air inlet pipe connected to an external air supply system and a dissolved air release device installed on the inner end of the air inlet pipe immersed in the water processor.

5. The integrated oil removal and flotation water treatment equipment according to claim 1, characterized in that, The slag scraping device includes a slag scraper installed on the top of the processor and a slag trough installed inside the baffle near the outlet pipe, with a slag scraper plate provided on the side of the slag trough near the slag scraper.

6. The integrated oil removal and flotation water treatment equipment according to claim 5, characterized in that, The end of the slag chute extends outside the water treatment unit.

7. The integrated oil removal and flotation water treatment equipment according to claim 1, characterized in that, A liquid level plate is installed on the side wall of the water processor near the outlet pipe.

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