An automated wastewater reverse osmosis treatment system

Abstract

This utility model discloses an automated wastewater reverse osmosis treatment system, including a decarbonation tower, a decarbonation water tank, a security filter, a first-stage reverse osmosis membrane unit, a second-stage reverse osmosis membrane unit, a backflow water tank, a reverse osmosis permeate tank, and a concentrate tank. A first pressure sensor is installed at the inlet of both the first-stage and second-stage reverse osmosis membrane units, and a second pressure sensor is installed at the concentrate outlet of both units. The advantage is that this utility model determines the degree of fouling of the reverse osmosis membrane unit based on the pressure difference detected by the pressure sensors at the inlet and concentrate outlet of either the first-stage or second-stage reverse osmosis membrane unit, and based on the permeate flow rate information fed back by the flow sensors. The controller then controls whether to flush the reverse osmosis membrane unit, avoiding untimely flushing.

Description

Technical fields: This utility model relates to the field of wastewater treatment, specifically to an automated reverse osmosis wastewater treatment system. Background technology: In wastewater treatment processes, the application of membrane technology has greatly improved wastewater resource utilization and reduced wastewater treatment costs. Existing high-concentration brine reverse osmosis membranes require periodic flushing during operation. Due to fluctuations in the quality of the wastewater, flushing according to a fixed cycle inevitably leads to over-flushing or untimely flushing. During flushing, inconsistent standards for judging flushing effectiveness and a lack of standardized procedures make it impossible to guarantee flushing results. Over-flushing introduces excessive wastewater back into the system, resulting in frequent start-ups and shutdowns, high energy consumption, poor economic efficiency, excessive manual operation, and a higher risk of misoperation. It also affects the continuous and stable operation of the membrane system and reduces its lifespan. Untimely flushing leads to the accumulation of contaminants on the membrane surface, reducing membrane flux and desalination rate, thus impacting the overall treatment effect and efficiency of the wastewater treatment system. As membrane fouling worsens, the performance of the reverse osmosis membrane gradually deteriorates, requiring more frequent replacement of membrane elements and increasing operating costs. Furthermore, membrane fouling can also lead to microbial growth, further affecting water quality and system stability. Utility Model Content: In order to solve the above problems, the purpose of this utility model is to provide an automated wastewater reverse osmosis treatment system.

[0001] This utility model is implemented by the following technical solution: An automated wastewater reverse osmosis treatment system includes a decarbonation tower, a decarbonation water tank, a security filter, a first-stage reverse osmosis membrane unit, a second-stage reverse osmosis membrane unit, a back suction water tank, a reverse osmosis permeate tank, and a concentrate tank. The wastewater pipeline's outlet is sequentially connected to the decarbonation tower, the decarbonation water tank, the filter feed pump, the security filter, the first-stage reverse osmosis booster pump, and the inlet of the first-stage reverse osmosis membrane unit. The concentrate outlet of the first-stage reverse osmosis membrane unit is connected to the inlet of the second-stage reverse osmosis booster pump via a pipeline. The outlet of the second-stage reverse osmosis booster pump is connected to the inlet of the second-stage reverse osmosis membrane unit via a pipeline. The concentrate outlet of the second-stage reverse osmosis membrane unit is connected to the inlet of the concentrate tank. The permeate outlets of both the first-stage and second-stage reverse osmosis membrane units are connected to the inlet of the backflow tank via pipelines. The outlet of the backflow tank is connected to the inlet of the reverse osmosis permeate tank via a pipeline. The outlet of the reverse osmosis permeate tank is divided into two paths: one path connects to the inlet of the circulating water system, and the other path connects to the inlet of the flushing pipeline. The outlet of the flushing pipeline is divided into two paths, which are respectively connected to the inlets of the first-stage reverse osmosis membrane unit and the second-stage reverse osmosis membrane unit. The concentrate outlet of the first-stage reverse osmosis membrane unit is also connected to the inlet of the concentrate tank through the flushing outlet pipeline. A flushing water pump and a flushing water valve are provided on the flushing pipeline. A level sensor is installed in the decarbonation tank; an inlet valve is installed at the outlet of the wastewater pipeline; a permeate valve is installed at the permeate outlet of both the first-stage and second-stage reverse osmosis membrane units; a concentrate valve is installed at the concentrate outlet of the second-stage reverse osmosis membrane unit; and a flushing outlet valve is installed on the flushing outlet pipeline. The signal output terminal of the level sensor is connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the signal input terminals of the inlet valve, the permeate valve, the concentrate valve, and the flushing outlet valve, respectively.

[0002] Furthermore, flow sensors are installed at the product water outlets of both the first-stage reverse osmosis membrane unit and the second-stage reverse osmosis membrane unit, and the signal output terminal of the flow sensor is connected to the signal input terminal of the controller.

[0003] Furthermore, the outlet of the reverse osmosis booster pump is connected to the inlet of the decarbonation tank via a return pipeline. A return water pump and a return water valve are installed on the return pipeline. A pH sensor is installed inside the decarbonation tank. The signal output terminal of the pH sensor is connected to the signal input terminal of the controller. The signal output terminal of the controller is connected to the signal input terminals of the return water pump and the return water valve.

[0004] Furthermore, an inlet valve is provided at the outlet of the wastewater pipeline, a product water valve is provided at the product water outlet of both the first-stage reverse osmosis membrane unit and the second-stage reverse osmosis membrane unit, a concentrate valve is provided at the concentrate outlet of both the second-stage reverse osmosis membrane unit, and a flushing outlet valve is provided on the flushing outlet pipeline; the signal output terminal of the controller is connected to the signal input terminals of the inlet valve, the product water valve, the concentrate valve, and the flushing outlet valve, respectively.

[0005] Furthermore, the outlet of the degassing fan is connected to the inlet of the decarbonization tower via a pipeline, and the vent at the top of the decarbonization tower is open to the atmosphere.

[0006] Advantages of this utility model: This invention determines the degree of fouling of the reverse osmosis membrane device by detecting the pressure difference between the inlet and concentrate outlet of a single-stage or two-stage reverse osmosis membrane device using a pressure sensor and by using the product water flow information fed back by a flow sensor. The controller then controls whether to flush the reverse osmosis membrane device, thus avoiding the situation of untimely flushing.

[0007] The pH sensor monitors the acidity or alkalinity of the wastewater in the decarbonation tank in real time. When the pH value exceeds the set range, the controller will activate the return water pump and return water valve to regulate the amount of return water entering the decarbonation tank, ensuring the stability of the water quality within the system. The level sensor monitors the liquid level in the decarbonation tank. When the liquid level is too high or too low, the controller will adjust the on / off states of the inlet valve, product water valve, concentrate valve, etc., accordingly to ensure the safe and stable operation of the system.

[0008] This automated control method allows the wastewater reverse osmosis treatment system to dynamically adjust according to actual operating conditions, avoiding over-rinsing problems caused by fixed-cycle flushing. This reduces the number of system start-ups and shutdowns, lowers energy consumption, and improves economic efficiency. At the same time, standardized operating procedures reduce the possibility of human error, ensuring continuous and stable operation of the membrane system, extending its lifespan, and improving the effectiveness and efficiency of wastewater treatment. Attached image description: Figure 1 This is a schematic diagram of the system connection in this embodiment; Figure 2 This is the control principle diagram of this embodiment.

[0009] In the diagram: 1. Wastewater pipeline; 2. Decarbonization tower; 3. Decarbonization water tank; 4. Filter feed pump; 5. Security filter; 6. First-stage reverse osmosis booster pump; 7. First-stage reverse osmosis membrane unit; 8. Second-stage reverse osmosis booster pump; 9. Second-stage reverse osmosis membrane unit; 10. Concentrate tank; 11. Backflow tank; 12. Reverse osmosis product water tank; 13. Circulating water system; 14. Flushing pipeline; 15. Flushing outlet pipeline; 16. Flushing water pump; 17. Flushing water valve; 18. First pressure sensor; 19. Second pressure sensor; 20. Controller; 21. Flow sensor; 22. Return pipeline; 23. Return water pump; 24. Return water valve; 25. pH sensor; 26. Liquid level sensor; 27. Inlet valve; 28. Product water valve; 29. ​​Concentrate valve; 30. Flushing outlet valve; 31. Deaeration fan. Detailed implementation method: The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0010] Example 1: like Figure 1 , Figure 2 The wastewater reverse osmosis automated treatment system shown includes a decarbonation tower 2, a decarbonation water tank 3, a security filter 5, a first-stage reverse osmosis membrane device 7, a second-stage reverse osmosis membrane device 9, a back suction water tank 11, a reverse osmosis product water tank 12, and a concentrate tank 10. The outlet of wastewater pipeline 1 is sequentially connected to the inlet of decarbonization tower 2, decarbonization water tank 3, filter feed pump 4, security filter 5, first-stage reverse osmosis booster pump 6, and first-stage reverse osmosis membrane unit 7. The concentrate outlet of first-stage reverse osmosis membrane unit 7 is connected to the inlet of second-stage reverse osmosis booster pump 8 via pipeline. The outlet of second-stage reverse osmosis booster pump 8 is connected to the inlet of second-stage reverse osmosis membrane unit 9 via pipeline. The concentrate outlet of second-stage reverse osmosis membrane unit 9 is connected to the inlet of concentrate tank 10. The product water outlets of first-stage reverse osmosis membrane unit 7 and second-stage reverse osmosis membrane unit 9 are both connected to the inlet of back suction water tank 11 via pipeline. The outlet of back suction water tank 11 is connected to the inlet of reverse osmosis product water tank 12 via pipeline. The outlet of degassing fan 31 is connected to the air inlet of decarbonization tower 2 via pipeline. The vent at the top of decarbonization tower 2 is open to the atmosphere.

[0011] The outlet of the reverse osmosis permeate tank 12 is divided into two paths. One path is connected to the inlet of the circulating water system 13, and the other path is connected to the inlet of the flushing pipeline 14. The outlet of the flushing pipeline 14 is divided into two paths, which are connected to the inlets of the first-stage reverse osmosis membrane unit 7 and the second-stage reverse osmosis membrane unit 9, respectively. The concentrate outlet of the first-stage reverse osmosis membrane unit 7 is also connected to the inlet of the concentrate tank 10 through the flushing outlet pipeline 15. A flushing water pump 16 and a flushing water valve 17 are provided on the flushing pipeline 14. An inlet valve 27 is provided at the outlet of wastewater pipeline 1. A product water valve 28 is provided at the product water outlet of both the first-stage reverse osmosis membrane unit 7 and the second-stage reverse osmosis membrane unit 9. A concentrate valve 29 is provided at the concentrate outlet of both the second-stage reverse osmosis membrane unit 9. A flushing outlet valve 30 is provided on the flushing outlet pipeline 15. A first pressure sensor 18 is provided at the inlet of both the first-stage reverse osmosis membrane unit 7 and the second-stage reverse osmosis membrane unit 9. A second pressure sensor 19 is provided at the concentrate outlet of both the first-stage reverse osmosis membrane unit 7 and the second-stage reverse osmosis membrane unit 9. A flow sensor 21 is provided at the product water outlet of both the first-stage reverse osmosis membrane unit 7 and the second-stage reverse osmosis membrane unit 9. The outlet of the first-stage reverse osmosis booster pump 6 is also connected to the inlet of the decarbonation tank 3 through a return pipeline 22. A return water pump 23 and a return water valve 24 are provided on the return pipeline 22. A pH sensor 25 is provided in the decarbonation tank 3. A level sensor 26 is also provided in the decarbonation tank 3.

[0012] The signal output terminals of the first pressure sensor 18, the second pressure sensor 19, the flow sensor 21, the pH sensor 25, and the liquid level sensor 26 are all connected to the signal input terminal of the controller 20. The signal output terminal of the controller 20 is connected to the signal input terminal of the flushing water pump 16, the flushing water valve 17, the return water pump 23, the return water valve 24, the inlet valve 27, the product water valve 28, the concentrate valve 29, and the flushing outlet valve 30, respectively.

[0013] Job Description: After pretreatment to remove turbidity, hardness, and silicon, the concentrated brine wastewater enters the decarbonization tank 3 through wastewater pipeline 1. When the level sensor 26 detects that the liquid level in the decarbonization tank 3 reaches the preset level value (30% of the total liquid level in the decarbonization tank 3), the controller 20 starts the reverse osmosis treatment. The specific process is as follows: First, open the inlet valve 27, the concentrate valve 29, and the product water valve 28 to open the inlet, product water, and concentrate water flow; second, start the flushing water pump 16 and the flushing water valve 17 to flush the first-stage reverse osmosis membrane unit 7 and the second-stage reverse osmosis membrane unit 9 for 5 minutes; when the liquid level in the reverse osmosis product water tank 12 is insufficient in the initial stage of system operation, demineralized water can be used for low-pressure raw water flushing.

[0014] After rinsing, the reverse osmosis system automatically switches to normal operation mode. Concentrated brine wastewater enters the decarbonation tower 2, and simultaneously, the degassing fan 31 starts. The gas generated by the degassing fan 31 is injected into the bottom of the decarbonation tower 2 through pipelines, forming a counter-current contact with the wastewater to remove dissolved carbon dioxide and reduce the risk of scaling in the subsequent reverse osmosis membrane unit. The exhaust gas generated during the decarbonation process is directly discharged into the atmosphere through the vent at the top of the decarbonation tower 2. Meanwhile, an acid-base adjustment device is installed on the inlet pipeline of the decarbonation tower 2. This device monitors the pH value of the decarbonated water in real time using the pH sensor 25 in the decarbonated water tank 3 and activates the acid-base adjustment device to maintain the pH value of the decarbonated water between 7 and 9, meeting the operating requirements of the reverse osmosis membrane unit and ensuring stable water quality for subsequent equipment. When the decarbonization wastewater in the decarbonization tank 3 is pumped to the security filter 5 by the filter feed pump 4, the residual suspended solids and colloidal particles (particle size ≥ 5μm) in the water are removed to avoid damage to the subsequent reverse osmosis membrane device; the filtered water enters the first-stage reverse osmosis booster pump 6, the pump body increases the water pressure to the working pressure of the first-stage reverse osmosis membrane (1.5-2.5MPa), and then it is sent to the first-stage reverse osmosis membrane device 7.

[0015] Within the first-stage reverse osmosis membrane unit 7, water permeates through the membrane element under pressure to form first-stage permeate. The concentrate that does not permeate (containing high concentrations of salts and contaminants) forms first-stage concentrate. This first-stage concentrate (still containing recyclable water resources) flows into the second-stage reverse osmosis booster pump 8, which increases the water pressure to the operating pressure (2.0-3.0 MPa) of the second-stage reverse osmosis membrane unit 9. It is then transported to the second-stage reverse osmosis membrane unit 9 for further pressure-driven membrane separation to remove residual salts and contaminants, improving the purity of the permeate and yielding second-stage permeate and second-stage concentrate. The second-stage concentrate flows through pipelines into the concentrate tank 10 for storage, awaiting subsequent treatment or resource utilization (such as evaporation and crystallization). The first-stage and second-stage permeate flows together into the return water tank 11. The qualified permeate in the return water tank 11 flows into the reverse osmosis permeate tank 12 through pipelines. The outlet of the reverse osmosis permeate tank 12 is divided into two paths: one path is delivered to the enterprise's circulating water system 13 (such as cooling water) to realize the recycling of water resources and reduce the consumption of fresh water; the other path is connected to the flushing pipeline 14 as the cleaning water source for the reverse osmosis membrane and is stored for later use. During the above process, the first pressure sensor 18 and the second pressure sensor 19, corresponding to the first-stage reverse osmosis membrane unit 7 and the second-stage reverse osmosis membrane unit 9, are used to monitor the membrane pressure difference of the first-stage reverse osmosis membrane unit 7 and the second-stage reverse osmosis membrane unit 9, respectively. The flow sensor 21 installed at the permeate outlet of the first-stage reverse osmosis membrane unit 7 and the second-stage reverse osmosis membrane unit 9 is used to monitor the permeate flow rate of the first-stage reverse osmosis membrane unit 7 and the second-stage reverse osmosis membrane unit 9, respectively. When the membrane pressure difference of any reverse osmosis membrane unit increases by 15% compared with the initial stage of system operation, or the permeate flow rate of any reverse osmosis membrane unit decreases by 10% compared with the initial stage of system operation, it is determined that the reverse osmosis membrane unit has concentration polarization and needs to be flushed.

[0016] The flushing process is as follows: Close the inlet valve 27, product water valve 28, and concentrate valve 29; stop the filter feed pump 4, the first-stage reverse osmosis booster pump 6, and the second-stage reverse osmosis booster pump 8; open the flushing water valve 17, start the flushing water pump 16, and deliver the qualified product water in the reverse osmosis product water tank 12 to the inlet of the first-stage reverse osmosis membrane unit 7 and the second-stage reverse osmosis membrane unit 9 to perform forward flushing of the membrane elements to remove contaminants (such as colloids and scale) attached to the membrane surface; the flushing wastewater containing contaminants enters the concentrate tank 10 to avoid secondary pollution; during the flushing process, when the membrane pressure difference between the two reverse osmosis membrane units decreases from the initial rise rate of the system operation to 5%, the flushing is completed, and the controller 20 closes the flushing water pump 16, the flushing water valve 17, and the flushing outlet valve 30, and the system returns to normal operation mode.

[0017] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automated reverse osmosis wastewater treatment system, characterized in that, It includes a decarbonation tower, a decarbonation water tank, a security filter, a first-stage reverse osmosis membrane unit, a second-stage reverse osmosis membrane unit, a back suction water tank, a reverse osmosis permeate tank, and a concentrate tank; The wastewater pipeline's outlet is sequentially connected to the decarbonation tower, the decarbonation water tank, the filter feed pump, the security filter, the first-stage reverse osmosis booster pump, and the inlet of the first-stage reverse osmosis membrane unit. The concentrate outlet of the first-stage reverse osmosis membrane unit is connected to the inlet of the second-stage reverse osmosis booster pump via a pipeline. The outlet of the second-stage reverse osmosis booster pump is connected to the inlet of the second-stage reverse osmosis membrane unit via a pipeline. The concentrate outlet of the second-stage reverse osmosis membrane unit is connected to the inlet of the concentrate tank. The permeate outlets of both the first-stage and second-stage reverse osmosis membrane units are connected to the inlet of the backflow tank via pipelines. The outlet of the backflow tank is connected to the inlet of the reverse osmosis permeate tank via a pipeline. The outlet of the reverse osmosis permeate tank is divided into two paths: one path connects to the inlet of the circulating water system, and the other path connects to the inlet of the flushing pipeline. The outlet of the flushing pipeline is divided into two paths, which are respectively connected to the inlets of the first-stage reverse osmosis membrane unit and the second-stage reverse osmosis membrane unit. The concentrate outlet of the first-stage reverse osmosis membrane unit is also connected to the inlet of the concentrate tank through the flushing outlet pipeline. A flushing water pump and a flushing water valve are provided on the flushing pipeline. A first pressure sensor is provided at the inlet of both the first-stage and second-stage reverse osmosis membrane devices, and a second pressure sensor is provided at the concentrate outlet of both devices. The signal output terminals of the first and second pressure sensors are connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the signal input terminal of the flushing water pump and the flushing water valve, respectively.

2. The automated reverse osmosis wastewater treatment system according to claim 1, characterized in that, A flow sensor is installed at the product water outlet of both the first-stage reverse osmosis membrane unit and the second-stage reverse osmosis membrane unit, and the signal output terminal of the flow sensor is connected to the signal input terminal of the controller.

3. The automated reverse osmosis wastewater treatment system according to claim 1, characterized in that, The outlet of the reverse osmosis booster pump is also connected to the inlet of the decarbonation tank via a return pipeline. A return water pump and a return water valve are installed on the return pipeline. A pH sensor is installed in the decarbonation tank. The signal output terminal of the pH sensor is connected to the signal input terminal of the controller. The signal output terminal of the controller is connected to the signal input terminals of the return water pump and the return water valve.

4. The automated reverse osmosis wastewater treatment system according to claim 1, characterized in that, A level sensor is installed in the decarbonation tank; an inlet valve is installed at the outlet of the wastewater pipeline; a permeate valve is installed at the permeate outlet of both the first-stage and second-stage reverse osmosis membrane units; a concentrate valve is installed at the concentrate outlet of the second-stage reverse osmosis membrane unit; and a flushing outlet valve is installed on the flushing outlet pipeline. The signal output terminal of the level sensor is connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the signal input terminals of the inlet valve, the permeate valve, the concentrate valve, and the flushing outlet valve, respectively.

5. The automated reverse osmosis wastewater treatment system according to claim 1, characterized in that, The outlet of the degassing fan is connected to the inlet of the decarbonization tower via a pipeline, and the vent at the top of the decarbonization tower is open to the atmosphere.

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