Resin tower reclaimed water recycling device

Abstract

The utility model provides a resin tower recycled water recycling device, which relates to the technical field of recycled water treatment and comprises a first recycled water tank and a second recycled water tank, the first recycled water tank is connected with a pipeline I used for receiving neutral recycled water and alkaline recycled water, and the first recycled water tank is further connected with an air pipeline and an alkali adding pipeline. The second recycling water tank is connected with a pipeline II for receiving acidic recycled water; backflow pipelines are arranged on the first recycling water tank and the second recycling water tank; a water pump is connected between the first recycling water tank and the second recycling water tank and is used for conveying recycled water from the second recycling water tank to the first recycling water tank; an output port of the first recycling water tank is connected to the mixing pipeline, an output port of the second recycling water tank is connected to the mixing pipeline, a valve is arranged on the output pipeline, and a pH meter is arranged at an output port of the mixing pipeline. According to the utility model, the resin tower reclaimed water can be fully utilized, the reclaimed water can be fully utilized, and the waste of water resources is avoided.

Description

Technical Field

[0001] This utility model relates to the field of reclaimed water treatment technology, specifically to a resin tower reclaimed water recycling device. Background Technology

[0002] In the secondary purification of brine during the ion-exchange membrane caustic soda production process, the resin tower needs to be regenerated offline periodically to ensure the activity of the chelating resin. The chelating resin regeneration involves seven steps: water washing I → backwashing → acid regeneration → water washing II → alkali regeneration → water washing III → brine replacement. Water washing I and backwashing generate a large amount of neutral regenerated water, acid regeneration and water washing II generate a large amount of acidic regenerated water, and alkali regeneration and water washing III generate a large amount of alkaline regenerated water. A large amount of resin tower regeneration wastewater is generated during the regeneration process. If it is discharged directly, it will not only cause environmental pollution but also waste water resources.

[0003] Utility model patent application CN213202484U discloses a resin tower regeneration wastewater treatment device, including an acidic wastewater tank for receiving acidic wastewater from the resin tower, an alkaline wastewater tank for receiving alkaline wastewater from the resin tower, and a water inlet tank and a circulation pump connected to the alkaline wastewater tank. The circulation pump leads to a salting tank. The acidic and alkaline wastewater tanks are separated by a partition that divides a large reaction tank into two parts. The partition has an overflow port at the top, which allows alkaline wastewater to overflow into the acidic wastewater tank for acid-base neutralization. This device allows alkaline wastewater to be recycled in the salting tank via the water inlet tank and circulation pump, while also overflowing into the acidic wastewater tank for acid-base neutralization. The acidic wastewater is discharged after neutralization with the alkaline wastewater, reducing environmental pollution.

[0004] This device can improve the utilization rate of resin tower regeneration wastewater, but it still has some shortcomings. The water from washing, backwashing, and the neutralization of acidic and alkaline wastewater is directly discharged. Only a portion of the regeneration wastewater is alkaline, and the utilization rate of resin tower regeneration water is not high enough. Utility Model Content

[0005] This invention addresses the aforementioned problems in the prior art by providing a resin tower regenerated water recycling device. It includes a first recycling tank for receiving neutral and alkaline regenerated water, and a second recycling tank for receiving acidic regenerated water. The neutral regenerated water can be directly piped into a storage tank in the next brine process. The alkaline and acidic regenerated water are neutralized in a mixing pipe before being fed into the storage tank. This device enables full utilization of the resin tower regenerated water, preventing water waste.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a resin tower regenerated water recycling device, comprising a first recycling tank and a second recycling tank, wherein the first recycling tank is connected to a pipe for receiving neutral regenerated water and alkaline regenerated water, and the first recycling tank is also connected to an air pipe and an alkali addition pipe, and the second recycling tank is connected to a pipe for receiving acidic regenerated water, and both the first recycling tank and the second recycling tank are provided with return pipes;

[0007] A water pump is connected between the first and second recycling tanks for conveying reclaimed water from the second recycling tank to the first recycling tank.

[0008] The output port of the first recycling tank is connected to the mixing pipe, the output port of the second recycling tank is connected to the mixing pipe and a valve is installed on the output pipe, and a pH meter is installed at the output port of the mixing pipe.

[0009] Preferably, a flow meter is installed on the alkali addition pipeline.

[0010] Preferably, the valve and flow meter are communicatively connected to the DCS system.

[0011] Preferably, the mixing pipe is equipped with a pipe mixer.

[0012] Preferably, the outlet of the mixing pipe is connected to a water storage tank for use as water in the brine process.

[0013] The beneficial effects of this invention are as follows: By setting up a first recovery tank for receiving neutral and alkaline regenerated water, and a second recovery tank for receiving acidic regenerated water, the neutral regenerated water is directly input into the storage tank of the next brine process through a pipeline. The alkaline and acidic regenerated water are neutralized in a mixing pipeline, and the neutralized regenerated water can then be input into the storage tank of the brine process. This device can realize the full utilization of the regenerated water of the resin tower and avoid waste of water resources. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] In the diagram: 1. First recycling tank, 2. Second recycling tank, 3. Return pipe, 4. Valve, 5. Air pipe, 6. Mixing pipe, 7. Pipe mixer, 8. pH meter, 9. Alkali addition pipe, 10. Water pump, 11. Flow meter, 12. Water storage tank, 13. Pipe 1, 14. Pipe 2. Detailed Implementation

[0016] The principles and features of this utility model are described below. The embodiments given are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0017] As shown in the attached drawings, this embodiment provides a resin tower reclaimed water recycling device, including a first recycling tank 1 and a second recycling tank 2. The first recycling tank 1 is connected to a pipe 13 for receiving neutral reclaimed water and alkaline reclaimed water. The first recycling tank 1 is also connected to an air pipe 5 and an alkali addition pipe 9. The second recycling tank 2 is connected to a pipe 14 for receiving acidic reclaimed water. Both the first recycling tank 1 and the second recycling tank 2 are provided with return pipes 3.

[0018] A water pump 10 is connected between the first recycling tank 1 and the second recycling tank 2 for conveying reclaimed water from the second recycling tank 2 to the first recycling tank 1;

[0019] The output port of the first recycling tank 1 is connected to the mixing pipe 6, the output port of the second recycling tank 2 is connected to the mixing pipe 6 and a valve 4 is installed on the output pipe, a pH meter 8 is installed at the outlet of the mixing pipe 6, and the output port of the mixing pipe 6 is connected to the water storage tank 12.

[0020] A flow meter 11 is installed at the alkali addition pipe 9 connected to the first recycling tank 1, and a pipe mixer 7 is installed in the mixing pipe 6.

[0021] The first recovery tank 1 first receives neutral regenerated water from washing I and backwashing. The received neutral regenerated water does not need pH adjustment and can be directly fed into the storage tank 12 of the next brine process through the pipeline. The alkaline regenerated water produced by alkali regeneration and washing III will first enter the first recovery tank 1. Because the pH of the alkaline regenerated water produced by the alkali regeneration step is different from that produced by the washing III step, the alkaline regenerated water needs to be mixed and stirred through the return pipeline 3 to stabilize the pH value of the alkaline regenerated water. The first recovery tank 1 is also connected to an air pipeline, which blows air into the first recovery tank 1 to make the alkaline regenerated water easier to mix evenly.

[0022] The second recycling tank 2 receives acidic regenerated water from acid regeneration and water washing II. The acidic regenerated water is also mixed and stirred through the return pipe 3 to stabilize its pH value.

[0023] The outlets of both the first and second recovery tanks 1 and 2 are connected to the mixing pipe 6. The alkaline regenerated water in the first recovery tank 1 and the acidic regenerated water in the second recovery tank 2 are output from the outlet ports and mixed in the mixing pipe 6. A pipe mixer 7 is installed in the mixing pipe 6 to ensure thorough mixing of the acidic and alkaline regenerated water. The neutralized and adjusted regenerated water, now slightly alkaline, is then transported through the mixing pipe 6 to the brine storage tank 12. A pH meter 8 is installed at the outlet of the mixing pipe 6 to monitor the pH value of the mixed regenerated water in real time and adjust the pH accordingly.

[0024] Alkaline reclaimed water is continuously added, while the amount of acidic reclaimed water is adjusted via control valve 4. If the pH of the mixed reclaimed water is too low, it indicates that too much acidic reclaimed water has been added, and the addition of acidic reclaimed water should be reduced or stopped. If the pH of the mixed reclaimed water is too high, it indicates that too much alkaline reclaimed water has been added, and the addition of acidic reclaimed water should be increased. If the pH of the reclaimed water flowing out of mixing pipe 6 is still low even after stopping the addition of acidic reclaimed water, an appropriate amount of alkali needs to be added to the first recovery water tank 1 through alkali addition pipe 9, and the amount of alkali added is adjusted by controlling flow meter 11 to adjust the reclaimed water to a slightly alkaline pH. If the pH of the reclaimed water flowing out of mixing pipe 6 is still high even after increasing the amount of acidic reclaimed water added, the water pump 10 needs to be turned on to pump some of the acidic reclaimed water from the second recovery water tank 2 directly to the first recovery water tank 1 to neutralize it with the alkaline reclaimed water, thus adjusting the reclaimed water to a slightly alkaline pH.

[0025] In another embodiment of this invention, valve 4 and flow meter 11 are communicatively connected to a DCS system. Based on the pH value displayed by the pH meter, valve 4 and flow meter 11 are remotely controlled via the DCS system.

[0026] This invention features a first recycling tank 1 that receives neutral and alkaline regenerated water, and a second recycling tank 2 that receives acidic regenerated water. The neutral regenerated water is directly piped into the storage tank 12 in the next brine process. The alkaline and acidic regenerated water are neutralized in a mixing pipe 6, and the neutralized regenerated water is then fed into the storage tank 12 in the brine process. This invention enables the full utilization of regenerated water from the resin tower without wasting water resources.

[0027] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A resin tower reclaimed water recycling device, characterized in that, It includes a first recycling tank (1) and a second recycling tank (2). The first recycling tank (1) is connected to a first pipe (13) for receiving neutral reclaimed water and alkaline reclaimed water. The first recycling tank (1) is also connected to an air pipe (5) and an alkali addition pipe (9). The second recycling tank (2) is connected to a second pipe (14) for receiving acidic reclaimed water. Both the first recycling tank (1) and the second recycling tank (2) are equipped with return pipes (3). A water pump (10) is connected between the first recycling tank (1) and the second recycling tank (2) for conveying reclaimed water from the second recycling tank (2) to the first recycling tank (1); The output port of the first recycling tank (1) is connected to the mixing pipe (6), the output port of the second recycling tank (2) is connected to the mixing pipe (6) and a valve (4) is provided on the output pipe, and a pH meter (8) is provided at the output port of the mixing pipe.

2. The resin tower reclaimed water recycling device according to claim 1, characterized in that, A flow meter (11) is installed on the alkali addition pipeline (9).

3. The resin tower reclaimed water recycling device according to claim 2, characterized in that, The valve (4) and flow meter (11) are connected to the DCS system for communication.

4. The resin tower reclaimed water recycling device according to claim 1, characterized in that, A pipe mixer (7) is provided in the mixing pipe (6).

5. The resin tower reclaimed water recycling device according to claim 1, characterized in that, The outlet of the mixing pipe (6) is connected to the water storage tank (12) for use as water in the brine process.

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