A removal device and removal method for removing organic matter in uranium purification conversion wastewater

Abstract

The application discloses a removal device and removal method for organic matters in uranium purification conversion wastewater, and belongs to the field of uranium wastewater recycling. The application solves the problem that a small amount of organic phase contained in residual liquid of raffinate wastewater generated in a uranium purification process reduces the adsorption effect of exchange resin, and leads to a substandard treatment result of the wastewater. The application comprises a pre-separation tank, a vacuum separator, a pre-filter, a polymer separator and an adsorption filter which are sequentially connected through pipelines. A sewage pipeline is connected to the inlet end of the pre-separation tank. The outlet end of the pre-separation tank is further connected to a waste oil collection tank. A discharge port is arranged on the adsorption filter. Through the removal device and removal method for organic matters in uranium purification conversion wastewater, the content of organic phase in the uranium-containing wastewater is reduced to below 1 mg / L, the adsorption effect of the exchange resin is avoided to be reduced by the organic phase in the uranium-containing wastewater, the adsorption effect of the exchange resin on uranium ions in the uranium-containing wastewater is improved, and the uranium content of the uranium-containing wastewater is discharged below a standard value.

Description

Technical Field

[0001] This invention relates to a device and method for removing organic matter from wastewater, belonging to the field of uranium wastewater recycling. Background Technology

[0002] The raffinate wastewater generated during the extraction and purification process in a uranium purification and conversion production line contains small amounts of organic phases such as TBP, DPB, MDP, and hydrogenated coal organic phases. This wastewater needs to be further treated in an ion exchange system to recover metallic uranium and meet emission standards. Experimental studies have shown that the organic phases in the wastewater adhere to the adsorption channels of the ion exchange resin, causing resin poisoning, reducing the resin's adsorption efficiency, and resulting in substandard wastewater treatment. Therefore, a device for removing organic matter from uranium purification and conversion wastewater is needed. Summary of the Invention

[0003] This invention addresses the problem that the raffinate wastewater generated during uranium purification contains a small amount of organic phase, which reduces the adsorption effect of the exchange resin, leading to substandard wastewater treatment results. Therefore, it discloses "an apparatus and method for removing organic matter from uranium purification and conversion wastewater." A brief overview of the invention is provided below to offer a basic understanding of certain aspects of it. It should be understood that this overview is not an exhaustive summary of the invention. It is not intended to identify key or essential parts of the invention, nor is it intended to limit the scope of the invention.

[0004] The technical solution of this invention:

[0005] An apparatus for removing organic matter from uranium purification and conversion wastewater includes a pre-separation tank, a vacuum separator, a pre-filter, a polymer separator, and an adsorption filter connected in sequence by pipelines. The inlet end of the pre-separation tank is connected to a sewage pipeline, and the outlet end of the pre-separation tank is also connected to a sludge collection tank. The adsorption filter is provided with a discharge port.

[0006] Furthermore, the outlet end of the vacuum separator is connected to an organic phase collection chamber, the outlet end of the organic phase collection chamber is connected to a sludge and oil collection tank, and an organic phase discharge pump is installed between the organic phase collection chamber and the sludge and oil collection tank.

[0007] Furthermore, a water pump is installed between the vacuum separator and the pre-filter.

[0008] Furthermore, the adsorption filter is provided with a backwash air inlet and a backwash water inlet. The backwash air inlet is connected in sequence to the adsorption filter, the polymer separator, the pre-filter, and the pre-separation box via a pipeline. The backwash water inlet is connected in sequence to the adsorption filter, the polymer separator, the pre-filter, and the pre-separation box via a pipeline.

[0009] Furthermore, the polymer separator is provided in two sets, which are connected in parallel, and the adsorption filter is provided in two sets, which are connected in parallel.

[0010] Furthermore, the pre-separation box includes a first chamber, a second chamber, and a third chamber. The bottom of the first chamber, the second chamber, and the third chamber are respectively provided with a drain valve, and the second chamber is connected to the first chamber and the third chamber respectively.

[0011] Furthermore, the first chamber is a natural settling chamber, the second chamber is a honeycomb inclined tube settling chamber, and honeycomb inclined tubes are arranged in the second chamber. The outlet end of the sewage pipe is located in the middle of the first chamber.

[0012] Furthermore, an oil level electrode is installed inside the pre-separation tank, and an ultrasonic level gauge is installed on the pre-separation tank.

[0013] A method for removing organic matter from uranium purification and conversion wastewater includes the following steps:

[0014] Step 1: Wastewater flows into the pre-separation tank through the wastewater pipe. After pre-treatment in the pre-separation tank, the separated organic phase is discharged into the sludge and oil collection tank through the pipe for storage. The wastewater separated in the pre-separation tank flows into the vacuum separator.

[0015] Step 2: The wastewater after pre-separation tank treatment enters the vacuum separator for vacuum separation. The vacuum separator separates the organic phase in the wastewater into the organic phase collection chamber. The wastewater after vacuum separation flows into the pre-filter through the pipeline.

[0016] Step 3: The organic phase in the organic phase collection chamber is pumped to the sludge and oil collection tank for storage by the organic phase discharge pump. The wastewater after being filtered by the pre-filter flows through the polymer separator and the adsorption filter through the pipeline for adsorption filtration.

[0017] Step 4: The wastewater, after being filtered by the polymer separator and adsorption filter, has an organic matter content of less than 1 mg / L and is discharged through the discharge outlet.

[0018] Step 5: Introduce clean water into the backwash water inlet. The clean water will flush the pre-separation tank, pre-filter, and polymer separator through the pipeline. Introduce gas into the backwash gas inlet. The gas will flush the pre-separation tank, pre-filter, and polymer separator through the pipeline.

[0019] Furthermore, the specific steps of step one include: wastewater enters the first chamber of the pre-separation tank for natural sedimentation, solid particles in the wastewater are deposited at the bottom of the first chamber and discharged through the drain valve, organic phase in the wastewater is suspended in the upper part of the first chamber, and the wastewater that has undergone natural sedimentation flows out through the upper part of the first chamber and then flows into the bottom of the second chamber. The impurities are filtered through the honeycomb inclined tubes in the second chamber. The honeycomb inclined tubes quickly separate the free organic phase and suspended organic phase in the wastewater. The filtered impurities are discharged through the drain valve at the bottom of the second chamber, and the wastewater flows from the top of the second chamber into the third chamber. The wastewater in the third chamber is discharged into the vacuum separator through a pipe, and the impurities are discharged through the drain valve at the bottom of the third chamber.

[0020] The beneficial effects of this invention are:

[0021] 1. The device and method for removing organic matter from uranium purification and conversion wastewater of the present invention are applicable to uranium-containing wastewater with a high content of organic matter. They can remove the organic phase from the uranium-containing wastewater, reduce the organic matter content in the uranium-containing wastewater to 1 mg / L, reduce the poisoning of ion exchange resin in subsequent processes, and improve the adsorption efficiency of ion exchange resin for uranium in uranium-containing wastewater, so that the uranium-containing wastewater can meet the discharge standards.

[0022] 2. The pre-separation box of the present invention sequentially passes the collected wastewater through a natural settling chamber and a honeycomb inclined tube settling chamber. In the natural settling chamber, the solid particles and organic phase in the wastewater are separated in the chamber. Then, the free organic phase and suspended organic phase in the wastewater are rapidly separated through the honeycomb inclined tube settling chamber, so as to achieve graded pre-separation of organic phase and impurities in uranium-containing wastewater.

[0023] 3. The vacuum separator of the present invention, with appropriate temperature and vacuum, can break the surface tension to achieve demulsification and realize the separation of water-encapsulated organic phase and water-encapsulated organic phase;

[0024] 4. Inside the polymer separator, tiny oil molecules are adsorbed onto the crisscrossing ultrafine fibers. As the number of tiny organic phase molecules on the fibers increases, these molecules attract each other and aggregate into larger oil droplets. When the droplets reach a certain diameter, the difference in gravity between the oil and water causes them to break free from the fibers and float to the surface, thus separating the oil and water. The crisscrossing fibers of the polymer adsorption filter element form a deep filter screen that can simultaneously filter and separate suspended impurities in the water. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a device for removing organic matter from wastewater used in uranium purification and conversion.

[0026] Figure 2 This is a schematic diagram of the internal structure of the pre-separation box.

[0027] In the diagram, 1-sewage pipe, 2-pre-separation tank, 3-vacuum separator, 4-water pump, 5-pre-filter, 6-polymer separator, 7-adsorption filter, 8-collecting organic phase chamber, 9-discharging organic phase pump, 10-sludge and oil collection tank, 11-discharge port, 12-backwash air inlet, 13-backwash water inlet, 14-first chamber, 15-second chamber, 16-third chamber, 17-oil level electrode, 18-ultrasonic level gauge, 19-drain valve. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0029] Specific implementation method one: Combining Figure 1 This embodiment describes an apparatus for removing organic matter from uranium purification and conversion wastewater. It includes a pre-separation tank 2, a vacuum separator 3, a pre-filter 5, a polymer separator 6, and an adsorption filter 7, connected sequentially by pipelines. The inlet of the pre-separation tank 2 is connected to a wastewater pipe 1, and the outlet of the pre-separation tank 2 is connected to a sludge collection tank 10. The adsorption filter 7 has a discharge port 11. Uranium-containing wastewater, containing organic phases, first undergoes pre-separation in the pre-separation tank 2 to separate and filter the organic phases and large particulate impurities. The wastewater after pre-separation in the pre-separation tank 2 flows through a pipeline into the vacuum separator 3 for further vacuum separation. Inside the vacuum separator 3, the vacuum separator 3 consists of a vacuum gravity separation chamber and a corrugated tube plate separation chamber. The separated organic phase enters the organic phase collection chamber 8 and is temporarily stored in the sludge and oil collection tank 10 by the organic phase discharge pump 9. The uranium-containing wastewater after being filtered by the vacuum separator 3 flows into the pre-filter 5 through the water pump 4 for pre-filtration. The filtered uranium-containing wastewater is then adsorbed and filtered by two sets of parallel polymer separators 6 and two sets of parallel adsorption filters 7 and discharged through the discharge port 11. The organic phase content in the wastewater is detected. If the organic phase content in the wastewater is less than 1 mg / L, the uranium in the uranium-containing wastewater can be adsorbed and treated by uranium exchange resin.

[0030] Specific Implementation Method Two: Combining Figure 1This embodiment describes a device for removing organic matter from uranium purification and conversion wastewater. The adsorption filter 7 is equipped with a backwash gas inlet 12 and a backwash water inlet 13. The backwash gas inlet 12 is connected sequentially to the adsorption filter 7, polymer separator 6, pre-filter 5, and pre-separation tank 2 via pipelines. The backwash water inlet 13 is also connected sequentially to these components via pipelines. After the device has filtered uranium-containing wastewater multiple times, the pre-separation tank 2, pre-filter 5, polymer separator 6, and adsorption filter 7 contain a significant amount of uranium-containing impurities, requiring flushing with clean water and gas. A suitable amount of clean water is added to the backwash inlet 13, flowing sequentially through pipelines into the adsorption filter 7, polymer separator 6, pre-filter 5, and pre-separation tank 2 to flush and remove organic phases and impurities. Then, gas is introduced into the backwash gas inlet 12, and the gas flows through pipelines to clean and dry the adsorption filter 7, polymer separator 6, pre-filter 5, and pre-separation tank 2.

[0031] Specific implementation method three: Combining Figure 2 This embodiment describes a device for removing organic matter from uranium purification and conversion wastewater. The pre-separation tank 2 includes a first chamber 14, a second chamber 15, and a third chamber 16. Each of the three chambers has a drain valve 19 at its bottom. The second chamber 15 is connected to both the first and third chambers. The first chamber 14 is a natural sedimentation chamber. Uranium-containing wastewater enters from the middle of the first chamber 14 for primary pre-separation, where sedimentation and separation occur. The separated organic phase rises and remains suspended in the upper part of the first chamber 14, while large particulate impurities in the wastewater settle to the bottom. The first chamber 14 is then drained by opening the drain valve 19 at its bottom. Wastewater separated by sedimentation in the first chamber 14 flows into the bottom of the second chamber 15, which is a honeycomb inclined tube sedimentation chamber. In the second chamber 15, the wastewater is agglomerated and enlarged by wetting and coalescing coarse organic phase particles, which enables the free organic phase and suspended organic phase in the wastewater to be separated rapidly, achieving secondary pre-separation. The uranium-containing wastewater after secondary pre-separation flows into the third chamber 16 through the top and into the vacuum separator 3 through the pipeline. The organic phase floating in the upper part of the pre-separator 2 flows into the sludge oil collection tank 10 through the pipeline for temporary storage. The oil level electrode 17 in the pre-separator 2 is used to measure the position of the organic phase in the pre-separation tank 2. The liquid level in the pre-separation tank 2 is measured by the ultrasonic level gauge 18 arranged above the pre-separator 2 to prevent the liquid level in the pre-separation tank 2 from being too high and flowing out of the pre-separation tank 2.

[0032] Specific implementation method four: Combination Figures 1-2This embodiment describes a method for removing organic matter from uranium purification and conversion wastewater, comprising the following steps:

[0033] Step 1: Wastewater flows into pre-separation tank 2 through wastewater pipe 1. After pre-treatment in pre-separation tank 2, the separated organic phase is discharged into waste oil collection tank 10 through pipe for storage. The wastewater separated in pre-separation tank 2 flows into vacuum separator 3.

[0034] Step 2: The wastewater treated by the pre-separation tank 2 enters the vacuum separator 3 for vacuum separation. The vacuum separator 3 separates the organic phase in the wastewater into the organic phase collection chamber 8. The wastewater after vacuum separation flows into the pre-filter 5 through the pipeline. The vacuum separator 3 is matched with a suitable temperature and vacuum degree, which can break the surface tension to achieve demulsification and realize the separation of water-encapsulated organic phase and organic phase-encapsulated water-organic phase.

[0035] Step 3: The organic phase in the organic phase chamber 8 is transported to the sludge and oil collection tank 10 for storage by the organic phase discharge pump 9. The wastewater after being filtered by the pre-filter 5 flows through the polymer separator 6 and the adsorption filter 7 in sequence for adsorption and filtration.

[0036] Step 4: After adsorption and filtration by the polymer separator 6 and adsorption filter 7, the wastewater with an organic matter content of less than 1 mg / L is discharged through the discharge port 11. Inside the polymer separator 6, tiny oil droplets are adsorbed onto the crisscrossing ultrafine fibers. As the number of tiny organic phase molecules on the fibers increases, these molecules attract each other and aggregate into larger oil droplets. When the droplets reach a certain diameter, under the influence of gravity, they break free from the fibers and float to the surface, achieving oil-water separation. The crisscrossing fibers of the polymer adsorption filter element form a deep filter screen, simultaneously filtering and separating suspended impurities in the water.

[0037] Step 5: Introduce clean water into the backwash water inlet 13. The clean water will flush the pre-separation tank 2, pre-filter 5 and polymer separator 6 through the pipeline. Introduce gas into the backwash air inlet 12. The gas will flush the pre-separation tank 2, pre-filter 5 and polymer separator 6 through the pipeline.

[0038] The specific steps of wastewater in the pre-separation tank 2 in step one are as follows: Wastewater enters the first chamber 14 of the pre-separation tank 2 for natural sedimentation. Solid particles in the wastewater are deposited at the bottom of the first chamber 14 and discharged through the drain valve 19. The organic phase in the wastewater is suspended in the upper part of the first chamber 14. After natural sedimentation, the wastewater flows out through the upper part of the first chamber 14 and then flows into the bottom of the second chamber 15. The impurities are filtered through the honeycomb inclined tubes of the second chamber 15. The honeycomb inclined tubes quickly separate the free organic phase and the suspended organic phase in the wastewater. The filtered impurities are discharged through the drain valve 19 at the bottom of the second chamber 15. The wastewater flows from the top of the second chamber 15 into the third chamber 16. The wastewater in the third chamber 16 is discharged into the vacuum separator 3 through a pipe. The impurities are discharged through the drain valve 19 at the bottom of the third chamber 16.

[0039] This embodiment is merely an exemplary description of this patent and does not limit its scope of protection. Those skilled in the art can make partial changes to it, and as long as they do not exceed the spirit and essence of this patent, they are all within the scope of protection of this patent.

Claims

1. A method for removing organic matter from uranium purification and conversion wastewater, characterized in that, The removal is carried out by a removal device, which includes a pre-separation box (2), a vacuum separator (3), a pre-filter (5), a polymer separator (6) and an adsorption filter (7) connected in sequence by pipes. The inlet end of the pre-separation box (2) is connected to a sewage pipe (1), and the outlet end of the pre-separation box (2) is also connected to a sludge collection box (10). The adsorption filter (7) is provided with a discharge port (11). The outlet end of the vacuum separator (3) is connected to an organic phase chamber (8), the outlet end of the organic phase chamber (8) is connected to a sludge oil collection tank (10), and an organic phase pump (9) is installed between the organic phase chamber (8) and the sludge oil collection tank (10). The adsorption filter (7) is provided with a backwash air inlet (12) and a backwash water inlet (13). The backwash air inlet (12) is connected in sequence to the adsorption filter (7), the polymer separator (6), the pre-filter (5) and the pre-separation box (2) through a pipe. The backwash water inlet (13) is connected in sequence to the adsorption filter (7), the polymer separator (6), the pre-filter (5) and the pre-separation box (2) through a pipe. The pre-separation box (2) includes a first chamber (14), a second chamber (15) and a third chamber (16). The bottom of the first chamber (14), the second chamber (15) and the third chamber (16) are respectively provided with a drain valve (19). The second chamber (15) is connected to the first chamber (14) and the third chamber (16) respectively. The first chamber (14) is a natural settling chamber, the second chamber (15) is a honeycomb inclined tube settling chamber, and honeycomb inclined tubes are arranged in the second chamber (15). The outlet end of the sewage pipe (1) is located in the middle of the first chamber (14). A water pump (4) is installed between the vacuum separator (3) and the pre-filter (5); The polymer separator (6) is provided in two sets, and the two sets of polymer separators (6) are arranged in parallel. The adsorption filter (7) is provided in two sets, and the two sets of adsorption filters (7) are arranged in parallel. The removal method includes the following steps: Step 1: Wastewater flows into the pre-separation tank (2) through the wastewater pipe (1). After pre-treatment in the pre-separation tank (2), the separated organic phase is discharged into the sludge and oil collection tank (10) through the pipe for storage. The wastewater separated by the pre-separation tank (2) flows into the vacuum separator (3). Step 2: The wastewater treated by the pre-separation box (2) enters the vacuum separator (3) for vacuum separation. The vacuum separator (3) separates the organic phase in the wastewater into the organic phase collection chamber (8). The wastewater after vacuum separation flows into the pre-filter (5) through the pipeline. Step 3: The organic phase in the organic phase chamber (8) is transported to the sludge and oil collection tank (10) for storage by the organic phase pump (9). The wastewater after being filtered by the pre-filter (5) flows through the polymer separator (6) and the adsorption filter (7) in sequence for adsorption filtration. Step 4: The wastewater with an organic matter content of less than 1 mg / L after adsorption and filtration by the polymer separator (6) and adsorption filter (7) is discharged through the discharge port (11); Step 5: Introduce clean water into the backwash water inlet (13). The clean water will flush the pre-separation tank (2), pre-filter (5) and polymer separator (6) through the pipeline. Introduce gas into the backwash gas inlet (12). The gas will flush the pre-separation tank (2), pre-filter (5) and polymer separator (6) through the pipeline.

2. The method for removing organic matter from uranium purification and conversion wastewater according to claim 1, characterized in that, The specific steps of step one include: wastewater enters the first chamber (14) of the pre-separation tank (2) for natural sedimentation. Solid particles in the wastewater are deposited at the bottom of the first chamber (14) and discharged through the drain valve (19). The organic phase in the wastewater is suspended in the upper part of the first chamber (14). After natural sedimentation, the wastewater flows out through the upper part of the first chamber (14) and then flows into the bottom of the second chamber (15). The impurities are filtered through the honeycomb inclined tube of the second chamber (15). The honeycomb inclined tube quickly separates the free organic phase and the suspended organic phase in the wastewater. The filtered impurities are discharged through the drain valve (19) at the bottom of the second chamber (15). The wastewater flows from the top of the second chamber (15) into the third chamber (16). The wastewater in the third chamber (16) is discharged into the vacuum separator (3) through the pipe. The impurities are discharged through the drain valve (19) at the bottom of the third chamber (16).

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