Efficient oil removal system

Abstract

The utility model relates to the technical field of sewage treatment equipment, in particular to a high-efficiency oil removal system which comprises a raw material extraction phase-splitting tank, a first material recovery phase-splitting tank, a second material recovery phase-splitting tank, an air flotation machine and an oxidation oil removal tank, the first material recovery phase-splitting tank is connected with the raw material extraction phase-splitting tank, and the second material recovery phase-splitting tank is connected with the air flotation machine; the air flotation machine adopts an efficient air dissolving device and a microbubble technology to carry out air flotation oil removal on the heavy-phase material. In the high-efficiency oil removal system, by integrating multiple technologies such as raw material extraction and phase separation, air flotation oil removal, material recovery and oxidation deep oil removal, the removal efficiency of grease in the oil-containing material and the recovery rate of the material are remarkably improved. According to the system, primary phase splitting is carried out by utilizing density difference and incompatibility of materials and grease, and then an efficient dissolved air flotation technology and a microbubble technology are combined, so that the limitation of a traditional air flotation oil removal technology during treatment of a non-aqueous system is effectively solved, and efficient removal of emulsified oil and dissolved oil is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment equipment, in particular to a high-efficiency oil removal system. Background Art

[0002] In industrial production and wastewater treatment processes, removing oil from materials to obtain pure oil-free (or low-oil) raw materials or products is a crucial step. Traditional oil removal technologies, such as static stratification and centrifugal separation, can effectively treat floating oil and dispersed oil, but their effectiveness is greatly reduced for emulsified oil and dissolved oil. Dissolved air flotation oil removal technology has been widely used in oily wastewater treatment due to its advantages such as simple process flow, low energy consumption and low chemical consumption. However, when this technology is used to treat other aqueous systems (such as acids, alkalis, salts, etc.), its application is limited due to the differences in physical and chemical properties between these materials and water.

[0003] Existing flotation oil removal devices and systems, such as those disclosed in patents CN103613157A, CN108996770A, and CN107417018A, primarily achieve efficient separation of different types of oil from oily wastewater by coupling flotation, coagulation, filtration, and chemical conversion. While these technologies perform well in treating oily wastewater, they remain inadequate when treating other oily materials, particularly in controlling the fate of the oil phase and recovering the oil.

[0004] Furthermore, traditional oil-water separation technologies often fail to clearly define the fate of the oil phase after separation. Using it solely as a raw material for low-value-added products or disposing it directly as waste liquid not only wastes resources but also poses a risk to the environment. Furthermore, existing flotation systems for collecting floating oil present issues such as scrapers retaining oil and material being scraped into the floating oil, impacting the recovery rate of both oil and material products. Utility Model Content

[0005] The purpose of this utility model is to provide a highly efficient oil removal system to address the problems of existing flotation oil removal devices and systems, as described in the background art, which primarily rely on a combination of flotation, coagulation, filtration, and chemical conversion technologies to achieve efficient separation of different types of oil from oily wastewater. While these technologies have demonstrated excellent performance in treating oily wastewater, they remain insufficient when treating other oily materials, particularly in terms of oil phase fate and material recovery.

[0006] To achieve the above object, the utility model provides an efficient oil removal system, which includes a raw material extraction and phase separation tank, a first material recovery and phase separation tank, a second material recovery and phase separation tank, a dissolved air flotation machine, an oxidation oil removal tank, and corresponding pumps and pipelines connected thereto. The raw material extraction and phase separation tank is used to receive the oil-containing raw material and perform preliminary phase separation through the principle of density difference and immiscibility between the material and the grease. The first material recovery and phase separation tank is connected to the raw material extraction and phase separation tank and is used to recover the residual material in the light-phase oil. The second material recovery and phase separation tank is connected to the dissolved air flotation machine and is used to recover the residual material in the floating oil removed by the dissolved air flotation. The dissolved air flotation machine adopts an efficient dissolved air device and microbubble technology to perform dissolved air flotation oil removal on the heavy-phase material. The tail end of the dissolved air flotation machine is connected to the oxidation oil removal tank, and the oxidation oil removal tank receives the material treated by the dissolved air flotation machine and further removes the trace grease in the material by adding an oxidant under high-temperature conditions.

[0007] Preferably, one side of the raw material extraction and phase separation tank is connected with a raw material pump through a pipeline, and a flow regulating valve is installed on the output pipeline of the raw material pump.

[0008] Preferably, a mixing tank is arranged inside the dissolved air flotation machine near one side close to the raw material extraction and phase separation tank, a dissolved air flotation chamber is arranged in the middle of the inside of the dissolved air flotation machine, and a clear liquid tank is arranged on the other side inside the dissolved air flotation machine. The bottom of the raw material extraction and phase separation tank is connected to one side of the mixing tank through a dissolved air flotation machine feed pump, and a flow regulating valve is installed on the output pipeline of the dissolved air flotation machine feed pump. The mixing tank is also connected with a dissolved air water access pipe, and a stirrer is installed inside the mixing tank.

[0009] Preferably, a heating coil is installed inside the clear liquid tank. One end of the heating coil is connected with a medium inlet pipe, and the other end is connected with a medium outlet pipe. A liquid level controller and a temperature controller are installed on the outer wall of the clear liquid tank.

[0010] Preferably, an oil collecting tank is arranged inside the dissolved air flotation machine, and an overflow port is arranged at the position of the dissolved air flotation chamber close to the oil collecting tank.

[0011] Preferably, the bottom of the oil collecting tank is connected to the top of the second material recovery and phase separation tank through a pipeline, and one side of the upper part of the raw material extraction and phase separation tank is connected to the first material recovery and phase separation tank through a pipeline.

[0012] Preferably, the bottom of the second material recovery and phase separation tank is connected to one side of the upper part of the first material recovery and phase separation tank through a second material recovery pump, and the bottom of the first material recovery and phase separation tank is connected to one side of the upper part of the raw material extraction and phase separation tank through a first material recovery pump.

[0013] Preferably, the bottom of the oxidation oil removal tank is connected back to the top of the oxidation oil removal tank through an oil removal material transfer pump.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] In this high-efficiency oil removal system, by integrating multiple technologies such as raw material extraction and phase separation, air flotation oil removal, material recovery, and oxidative deep oil removal, the removal efficiency of oil in oil-containing materials and the recovery rate of materials are significantly improved. The system uses the density difference and the immiscibility of materials and oil to conduct preliminary phase separation, and then combines the high-efficiency dissolved air flotation technology and microbubble technology to effectively solve the limitations of traditional air flotation oil removal technology in treating non-aqueous systems, achieving efficient removal of emulsified oil and dissolved oil.

[0016] By setting up the first material recovery and phase separation tank and the second material recovery and phase separation tank, the residual materials in the floating oil removed during the air flotation process are recovered, improving the material recovery rate and avoiding resource waste and environmental pollution. In addition, the introduction of the oxidative oil removal tank further removes trace amounts of oil in the material by adding an oxidant and under high-temperature conditions, ensuring the purity and low oil content of the final product and meeting the requirements of industrial production for high-quality raw materials. In summary, the high-efficiency oil removal system of the present utility model not only improves the oil removal efficiency but also optimizes the material recovery process, having significant technical effects and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0018] Figure 2 is a schematic diagram of the internal structure of the air flotation machine of the present utility model;

[0019] The meanings of each reference numeral in the figure are as follows:

[0020] 1, raw material pump; 2, raw material extraction and phase separation tank; 3, air flotation machine feed pump; 4, air flotation machine; 41, air flotation chamber; 42, mixing tank; 43, floating oil collection tank; 44, clear liquid tank; 441, medium inlet pipe; 442, medium outlet pipe; 5, second material recovery and phase separation tank; 6, second material recovery pump; 7, first material recovery and phase separation tank; 8, first material recovery pump; 9, oxidative oil removal tank; 10, oil removal material transfer pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0022] The present utility model provides a high-efficiency oil removal system, as Figure 1 - Figure 2As shown in the figure, it includes a raw material extraction and phase separation tank 2, a first material recovery and phase separation tank 7, a second material recovery and phase separation tank 5, a dissolved air flotation machine 4, an oxidation and oil removal tank 9, as well as corresponding pumps and pipeline connections. The raw material extraction and phase separation tank 2 is used to receive the oil-containing raw materials and conduct preliminary phase separation based on the density difference and the principle of immiscibility between the materials and the grease. The first material recovery and phase separation tank 7 is connected to the raw material extraction and phase separation tank 2 and is used to recover the residual materials in the light-phase oil. The second material recovery and phase separation tank 5 is connected to the dissolved air flotation machine 4 and is used to recover the residual materials in the floating oil removed by the dissolved air flotation. The dissolved air flotation machine 4 adopts a high-efficiency dissolved air device and microbubble technology to conduct dissolved air flotation and oil removal on the heavy-phase materials. The dissolved air flotation and oil removal of the dissolved air flotation machine 4 by using the high-efficiency dissolved air device and microbubble technology is the content of the prior art. The working principle of the dissolved air flotation machine 4 is mainly based on the physical interaction between the gas and the liquid. By introducing a large number of microbubbles and using the adsorption effect between the bubbles and the suspended substances, the purpose of separating the suspended substances and organic matters from the water is achieved, and no detailed description will be made here; the tail end of the dissolved air flotation machine 4 is connected to the oxidation and oil removal tank 9. The oxidation and oil removal tank 9 receives the materials processed by the dissolved air flotation machine 4 and further removes the trace grease in the materials by adding an oxidant under high-temperature conditions. The raw material extraction and phase separation tank uses the density difference and the principle of immiscibility between the materials and the grease to conduct preliminary phase separation on the oil-containing raw materials, effectively separating most of the grease and materials, laying a good foundation for subsequent processing. By setting the first material recovery and phase separation tank and the second material recovery and phase separation tank to respectively recover the residual materials in the light-phase oil and the residual materials in the floating oil removed by the dissolved air flotation, the recovery rate of the materials is significantly improved, and resource waste is reduced. The dissolved air flotation machine adopts a high-efficiency dissolved air device and microbubble technology to conduct dissolved air flotation and oil removal on the heavy-phase materials, effectively removing the emulsified oil and dissolved oil in the materials and improving the oil removal efficiency. The oxidation and oil removal tank receives the materials processed by the dissolved air flotation machine, further removes the trace grease in the materials by adding an oxidant and under high-temperature conditions, ensuring the purity and low oil content of the final product and meeting the strict requirements of industrial production for high-quality raw materials

[0023] In this embodiment, one side of the raw material extraction and phase separation tank 2 is connected with a raw material pump 1 through a pipeline, and a flow regulating valve is installed on the output pipeline of the raw material pump 1 to facilitate the control of the feed rate.

[0024] Specifically, a mixing tank 42 is arranged inside the dissolved air flotation machine 4 near one side close to the raw material extraction and phase separation tank 2, a dissolved air flotation chamber 41 is arranged in the middle inside the dissolved air flotation machine 4, and a clear liquid tank 44 is arranged on the other side inside the dissolved air flotation machine 4. The bottom of the raw material extraction and phase separation tank 2 is connected to one side of the mixing tank 42 through a dissolved air flotation feed pump 3. A flow regulating valve is installed on the output pipeline of the dissolved air flotation feed pump 3. The mixing tank 42 is also connected with a dissolved air water access pipe, and a stirrer is installed inside the mixing tank 42 to facilitate the mixing of the raw materials.

[0025] Further, a heating coil is installed in the clear liquid tank 44. One end of the heating coil is connected to a medium inlet pipe 441, and the other end is connected to a medium outlet pipe 442. A liquid level controller and a temperature controller are installed on the outer wall of the clear liquid tank 44 to control the liquid level and temperature.

[0026] Further, an oil floating collection tank 43 is arranged inside the air flotation machine 4. An overflow port is arranged near the oil floating collection tank 43 in the air flotation chamber 41 for overflow collection of the oil floating collection tank 43.

[0027] Further, the bottom of the oil floating collection tank 43 is connected to the top of the second material recovery and phase separation tank 5 through a pipeline, and one side of the upper part of the raw material extraction and phase separation tank 2 is connected to the first material recovery and phase separation tank 7 to facilitate the recovery of the oil floating in the material.

[0028] Further, the bottom of the second material recovery and phase separation tank 5 is connected to one side of the upper part of the first material recovery and phase separation tank 7 through a second material recovery pump 6, and the bottom of the first material recovery and phase separation tank 7 is connected to one side of the upper part of the raw material extraction and phase separation tank 2 through a first material recovery pump 8 to facilitate the recovery operation of the material.

[0029] Further, the bottom of the oxidation and oil removal tank 9 is connected back to the top of the oxidation and oil removal tank 9 through an oil removal material transfer pump 10 to facilitate the circulating transportation of the material, enabling it to fully perform the oxidation and oil removal operation. One side of the circulating pipeline is externally connected to a purified product discharge pipe, and a valve is installed on the purified product discharge pipe to discharge the purified material through the purified product discharge pipe.

[0030] When the high-efficiency oil removal system of the present utility model is in use, first, the oil-containing material is sent into the raw material extraction and phase separation tank 2 through the raw material pump 1. The preliminary oil removal process is completed in the raw material extraction and phase separation tank 2. By controlling the opening degree of the outlet regulating valve of the air flotation machine feed pump 3, the phase separation interface between the oil and the material in the raw material extraction and phase separation tank 2 is controlled in the middle of the sight glass. The upper light-phase oil flows into the first material recovery and phase separation tank 7 by gravity to recover the residual material in the oil, and the heavy-phase material enters the air flotation machine 4 through the air flotation machine feed pump 3.

[0031] After the material after preliminary oil removal is sent into the air flotation machine 4 through the air flotation machine feed pump 3, when the liquid level in the air flotation chamber 41 reaches a predetermined height, a flotation agent is added, and the air flotation machine 4 is started to operate for air flotation oil removal.

[0032] During the above operation process, when the liquid levels in the first material recovery and phase separation tank 7 and the second material recovery and phase separation tank 5 reach a certain level, the first material recovery pump 8 and the second material recovery pump 6 are started to control the phase separation interface within the visible range of the sight glass in the phase separation tank, and the oil storage work is carried out well.

[0033] By controlling the liquid level of the air flotation machine 4, the upper layer of the material containing impurities such as oil flotation out by the air flotation chamber 41 enters the floating oil collection tank 43 in an overflow manner, and then flows into the second material recovery and phase separation tank 5 by gravity.

[0034] When the clear liquid tank 44 reaches a certain liquid level, the heating coil is started to raise the temperature of the material to a certain temperature, and then the material flows into the oxidation and oil removal tank 9 by gravity.

[0035] When the oxidation and oil removal tank 9 reaches a certain liquid level, an oxidant (hydrogen peroxide) is added to the tank. Under the oxidation of the oxidant, the oil in the material is further removed. After analyzing the oil content (TOC) of the oxidized and oil-removed material, when the oil removal of the material is qualified, the oil-removed product is discharged through the pipeline.

[0036] The applicable range of the material of this oil removal technology is wide. It is suitable for the removal of oil in a large amount of oil-containing materials, and can also be used for the further removal of oil in trace oil-containing materials. Moreover, this oil removal technology has a good oil removal effect. Through preliminary oil removal in the phase separation tank, most of the oil in the material can be removed. Through air flotation oil removal, the oil content in the material can be reduced to about 300 ppm (total organic carbon TOC). After further oxidation and oil removal, without adding a coagulant aid, the oil content in the material can be reduced to about 10 ppm (total organic carbon TOC).

[0037] The above shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions in the specification are only preferred examples of the present invention, and do not limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An efficient oil removal system, characterized in that: It includes a raw material extraction and phase separation tank (2), a first material recovery and phase separation tank (7), a second material recovery and phase separation tank (5), a flotation machine (4), and an oxidation and degreasing tank (9). The first material recovery and phase separation tank (7) is connected to the raw material extraction and phase separation tank (2), and the second material recovery and phase separation tank (5) is connected to the flotation machine (4). The tail end of the flotation machine (4) is connected to the oxidation and degreasing tank (9), and the oxidation and degreasing tank (9) receives the material processed by the flotation machine (4) and further removes trace oil in the material.

2. The high-efficiency oil removal system according to claim 1, wherein: One side of the raw material extraction and phase separation tank (2) is connected with a raw material pump (1) through a pipeline, and a flow regulating valve is installed on the pipeline at the output end of the raw material pump (1).

3. The high-efficiency oil removal system according to claim 1, wherein: Inside the flotation machine (4), a mixing tank (42) is arranged on the inner side close to the raw material extraction and phase separation tank (2), a flotation chamber (41) is arranged in the middle inside the flotation machine (4), and a clear liquid tank (44) is arranged on the other side inside the flotation machine (4). The bottom of the raw material extraction and phase separation tank (2) is connected to one side of the mixing tank (42) through a flotation machine feed pump (3), and a flow regulating valve is installed on the pipeline at the output end of the flotation machine feed pump (3). The mixing tank (42) is also connected with a dissolved air water access pipe, and a stirrer is installed inside the mixing tank (42).

4. The high-efficiency oil removal system according to claim 3, characterized in that: Heating coils are installed inside the clear liquid tank (44). One end of the heating coils is connected with a medium inlet pipe (441), and the other end is connected with a medium outlet pipe (442). A liquid level controller and a temperature controller are installed on the outer wall of the clear liquid tank (44).

5. The high-efficiency oil removal system according to claim 3, characterized in that: An oil collecting tank (43) is arranged inside the flotation machine (4), and an overflow port is arranged at the flotation chamber (41) close to the oil collecting tank (43).

6. The high-efficiency oil removal system according to claim 5, characterized in that: The bottom of the oil collecting tank (43) is connected to the top of the second material recovery and phase separation tank (5) through a pipeline, and one side of the upper part of the raw material extraction and phase separation tank (2) is connected to the first material recovery and phase separation tank (7) through a pipeline.

7. The high-efficiency oil removal system according to claim 1, wherein: The bottom of the second material recovery and phase separation tank (5) is connected to one side of the upper part of the first material recovery and phase separation tank (7) through a second material recovery pump (6), and the bottom of the first material recovery and phase separation tank (7) is connected to one side of the upper part of the raw material extraction and phase separation tank (2) through a first material recovery pump (8).

8. The high-efficiency oil removal system according to claim 1, wherein: The bottom of the oxidation and degreasing tank (9) is connected back to the top of the oxidation and degreasing tank (9) through an oil removal material transfer pump (10).

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