A high magnification membrane concentration limit testing device

Abstract

The utility model discloses a kind of high-multiple membrane concentration limit testing devices, the device includes raw water tank, filter, primary reverse osmosis membrane group, secondary reverse osmosis membrane group, and is connected by pipeline between each other, the raw water tank is connected with filter, filter is connected with primary reverse osmosis membrane group, primary water tank is provided in the rear of primary reverse osmosis membrane group, primary water tank is connected with secondary reverse osmosis membrane group, secondary reverse osmosis membrane group rear is connected with secondary water tank, raw water pump is provided between the raw water tank and filter, primary reverse osmosis high-pressure pump is provided between filter and primary reverse osmosis membrane group, secondary reverse osmosis high-pressure pump is provided between primary water tank and secondary reverse osmosis membrane group, water inlet pipe is provided on raw water tank, water outlet pipe is provided after secondary water tank, the utility model whole structure is simple and reasonable, efficient, compact, operating cost is low and pretreatment effect is stable.

Description

Technical Field

[0001] This utility model belongs to the field of zero-discharge treatment technology for industrial high-salt wastewater, and relates to a high-concentration membrane limit testing device. Background Technology

[0002] Reverse osmosis is a selective permeation separation technology that uses external pressure to overcome the osmotic pressure across a membrane. It utilizes the properties of a semi-permeable membrane to trap the desired solute on the outside, allowing the solvent to pass through. Currently, the most commonly used membrane technology in membrane concentration is ultra-high pressure membrane concentration, such as UHPRO and DTRO / STRO, using specialized ultra-high pressure membranes. At an operating pressure of 120 bar, these membranes can achieve a final concentrate concentration of 100,000-150,000 mg / L. However, the high pressure risks and energy consumption associated with ultra-high pressure result in high operating costs and energy consumption. Even with ultra-high pressure membrane concentration, it is difficult to achieve the same effect as thermal concentration processes such as MVR, and the concentrate volume after membrane concentration is still relatively large. This places high demands on subsequent thermal evaporation and condensation processes, leading to very high construction and operating costs. This places higher demands on the upgrading and improvement of reverse osmosis membrane products and operating processes. Furthermore, the high pressure also places higher requirements on testing equipment.

[0003] Therefore, in response to the above application scenarios and testing conditions, this patent design provides a high-concentration membrane limit testing device for the field of zero discharge technology for industrial high-salt wastewater. This device can also be applied to pilot or small-scale treatment scenarios in system engineering projects for formal production. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a high-concentration limit testing device with a simple and reasonable structure, high efficiency, compact size, low operating cost and stable pretreatment effect.

[0005] This utility model is achieved through the following technical solution: a high-concentration membrane limit testing device, which includes a raw water tank, a filter, a primary reverse osmosis membrane module, and a secondary reverse osmosis membrane module, all connected to each other via pipelines. The raw water tank is connected to the filter, and the filter is connected to the primary reverse osmosis membrane module. A primary product water tank is located downstream of the primary reverse osmosis membrane module and connected to the secondary reverse osmosis membrane module. A secondary product water tank is also located downstream of the secondary reverse osmosis membrane module. A raw water pump is installed between the raw water tank and the filter for... The raw water is pressurized, and a first-stage reverse osmosis high-pressure pump is installed between the filter and the first-stage reverse osmosis membrane module. A second-stage reverse osmosis high-pressure pump is installed between the first-stage product water tank and the second-stage reverse osmosis membrane module. An inlet pipe is installed on the raw water tank, and an outlet pipe is installed after the second-stage product water tank. A cleaning system and a flushing system are also installed between the first-stage reverse osmosis membrane module, the first-stage reverse osmosis high-pressure pump, and the second-stage reverse osmosis membrane module, respectively. A return pipeline is also added between the first-stage and second-stage reverse osmosis membrane modules and the raw water tank. A temperature control system is also installed on the raw water tank.

[0006] Preferably, the reflux pipeline is provided in a total of 4 lines: a first reflux pipeline for returning permeate water from the first-stage reverse osmosis membrane unit to the raw water tank; a second reflux pipeline for returning concentrate water from the first-stage reverse osmosis membrane unit to the raw water tank; a third reflux pipeline for returning permeate water from the second-stage reverse osmosis membrane unit to the permeate end of the first-stage reverse osmosis membrane unit and / or the raw water tank; and a fourth reflux pipeline for returning concentrate water from the second-stage reverse osmosis membrane unit to the inlet end of the first-stage reverse osmosis membrane unit and / or the raw water tank.

[0007] Preferably, the cleaning system includes a cleaning water tank and a cleaning water pump. The cleaning water tank is connected to the first-stage reverse osmosis membrane module, the first-stage reverse osmosis high-pressure pump, and the second-stage reverse osmosis membrane module, and a chemical dosing port is provided on the cleaning water tank.

[0008] Preferably, the flushing system includes a flushing water tank and a flushing water pump, wherein the flushing water tank is connected to the first-stage reverse osmosis membrane module, the first-stage reverse osmosis high-pressure pump, and the second-stage reverse osmosis membrane module, respectively.

[0009] Preferably, the temperature control system includes a heating pump, a heat exchanger, and a thermometer. The temperature in the raw water tank is measured by the thermometer, and the heating pump and heat exchanger are controlled to turn on and off. The cold source for the heat exchanger is an external tap or refrigerant.

[0010] Preferably, the raw water tank, filter, primary reverse osmosis membrane module, secondary reverse osmosis membrane, primary product water tank, secondary product water tank, cleaning system, flushing system, and temperature control system are all skid-mounted inside the container, and electric valves are also arranged on the pipelines. The electric valves and temperature control system are all controlled by an electrical control cabinet arranged inside the container.

[0011] The beneficial effects of this utility model are as follows: 1) The process equipment design of this utility model achieves high-concentration of concentrate and desalination water through the circulation of concentrated and desalinated water in the first-stage and second-stage reverse osmosis processes. This allows for the testing of the stable limit permeate production rate of the membrane concentration. The equipment also enables membrane start-up flushing and chemical cleaning, ensuring long-term and efficient membrane utilization. Furthermore, it features high integration, with all equipment integrated into a single skid-mounted unit, maximizing space utilization. It can be installed within a standard 20-foot shipping container, facilitating overall transportation and site layout.

[0012] 2) This utility model reverse osmosis system can be operated in stages and individually in cycles, testing the maximum desalination rate during staged operation and overall operation, as well as testing the different energy consumption under different operating conditions of first-stage and second-stage reverse osmosis. In addition, the equipment is tested to extreme degrees, which can reduce the waste of resources.

[0013] 3) This utility model adopts an integrated design, which saves space and is easy to move. It can be installed, moved and used in a container.

[0014] 4) This utility model is versatile; it can be used for membrane testing and can also be put into formal production.

[0015] 5) This utility model is equipped with a heat exchanger in the designed equipment, which makes the water temperature controllable during the operation of the device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall process of this utility model.

[0017] Figure 2 This is a three-dimensional structural diagram of the present invention. Detailed Implementation

[0018] To enable those skilled in the art to more clearly understand the purpose, technical solution and advantages of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "horizontal", and "vertical" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] The present invention will now be described in detail with reference to the accompanying drawings: Figure 1As shown, a high-concentration membrane limit testing device includes a raw water tank 1, a filter 2, a primary reverse osmosis membrane module 3, and a secondary reverse osmosis membrane module 4, all connected by pipelines. The raw water tank 1 is connected to the filter 2, and the filter 2 is connected to the primary reverse osmosis membrane module 3. A primary product water tank 5 is located downstream of the primary reverse osmosis membrane module 3 and is connected to the secondary reverse osmosis membrane module 4. A secondary product water tank 6 is connected downstream of the secondary reverse osmosis membrane module 4. A raw water pump 7 is installed between the raw water tank 1 and the filter 2 to pressurize the raw water. A primary reverse osmosis high-pressure pump 8 is installed between the primary reverse osmosis membrane module 2 and the primary reverse osmosis membrane module 3. A secondary reverse osmosis high-pressure pump 9 is installed between the primary product water tank 5 and the secondary reverse osmosis membrane module 4. An inlet pipe 10 is installed on the raw water tank 1. An outlet pipe 11 is installed after the secondary product water tank 6. A cleaning system and a flushing system are also installed between the primary reverse osmosis membrane module 3, the primary reverse osmosis high-pressure pump 8, and the secondary reverse osmosis membrane module 4, respectively. A return pipeline 12 is also added between the primary reverse osmosis membrane module 3 and the secondary reverse osmosis membrane module 4 and the raw water tank 1. A temperature control system is also installed on the raw water tank 1.

[0021] The return pipeline 12 is provided with a total of 4 pipelines, namely the first return pipeline 13 which returns the permeate water of the first-stage reverse osmosis membrane module 3 to the raw water tank 1, the second return pipeline 14 which returns the concentrate water of the first-stage reverse osmosis membrane module 3 to the raw water tank 1, the third return pipeline 15 which returns the permeate water of the second-stage reverse osmosis membrane module 4 to the permeate water end of the first-stage reverse osmosis membrane module 3 and / or the raw water tank 1, and the fourth return pipeline 16 which returns the concentrate water of the second-stage reverse osmosis membrane module 4 to the inlet end of the first-stage reverse osmosis membrane module 3 and / or the raw water tank 1.

[0022] The cleaning system includes a cleaning water tank 17 and a cleaning water pump 18. The cleaning water tank 17 is connected to the first-stage reverse osmosis membrane module 3, the first-stage reverse osmosis high-pressure pump 8, and the second-stage reverse osmosis membrane module 4, and a chemical dosing port 19 is provided on the cleaning water tank 17.

[0023] The flushing system includes a flushing water tank 20 and a flushing water pump 21. The flushing water tank 20 is connected to the first-stage reverse osmosis membrane module 3, the first-stage reverse osmosis high-pressure pump 8, and the second-stage reverse osmosis membrane module 4, respectively.

[0024] The reverse osmosis membrane in this invention can effectively reduce organic and inorganic fouling in the evaporation and crystallization system, ensuring stable system operation. The inlet has branches for flushing pipes and rinsing pipes. The discharge and return ports for concentrated water, as well as the inlet and flushing ports, are all equipped with electric valves for automatic control.

[0025] The temperature control system includes a heating pump 22, a heat exchanger 23, and a thermometer 24. The temperature in the raw water tank 1 is measured by the thermometer 24, and the heating pump 22 and the heat exchanger 23 are controlled to turn on and off. The cold source of the heat exchanger 23 is an external tap or refrigerant.

[0026] The raw water tank 1, filter 2, primary reverse osmosis membrane module 3, secondary reverse osmosis membrane 4, primary product water tank 5, secondary product water tank 6, cleaning system, flushing system, and temperature control system are all skid-mounted inside container 25. Electric valves are also arranged on the pipelines. The electric valves and temperature control system are all controlled by the electrical control cabinet 26 arranged inside container 25.

[0027] The design features of this utility model are as follows: Raw water tank, used to store and control the sodium chloride concentration in raw water; The raw water pump is connected to the outlet of the raw water tank and is used to pressurize the raw water. A filter, connected to the raw water pump outlet, is used to protect the subsequent reverse osmosis membrane; A first-stage reverse osmosis high-pressure pump 8 and a first-stage reverse osmosis membrane module, wherein the first-stage reverse osmosis high-pressure pump is connected after the filter to provide inlet water pressure for the first-stage reverse osmosis membrane module; The system includes a secondary reverse osmosis high-pressure pump and a secondary reverse osmosis membrane module. The inlet of the secondary reverse osmosis membrane module is connected to the concentrate outlet of the primary reverse osmosis membrane module via a pipeline. The secondary reverse osmosis high-pressure pump is installed on this pipeline to provide ultra-high pressure to the secondary reverse osmosis membrane module to achieve high concentration. The cleaning system, including a cleaning water tank and a cleaning water pump, is used to remove scale from the membrane module; The flushing system includes a flushing water tank and a flushing water pump for starting the flushing process; The temperature control system, including a heating pump and a heat exchanger, is used to reduce the temperature of the water that is heated in the system circulation.

[0028] The processing device of this invention can realize the cyclic operation of the system, thus increasing the application scenarios of this device. It can be used for testing while also being put into normal industrial use.

[0029] like Figure 2 As shown, starting from the left side of the entrance, there are: electrical control cabinet 26, heat exchanger 23, heating pump 22, raw water tank 1, raw water pump 7, filter 2, cleaning water tank 17, and the final secondary product water tank 6. Starting from the right side of the entrance, there are: primary reverse osmosis high-pressure pump 8, secondary reverse osmosis high-pressure pump 9, cleaning water pump 18, flushing water pump 21, and the primary product water tank 5 at the end of the primary stage. Space is reserved below to place a maintenance toolbox. A long corridor is provided in the middle of the skid-mounted container 25 to facilitate equipment operation and maintenance. Various functional pipe interfaces are provided on the outside.

[0030] This utility model adopts a shared design, integrating the flushing water tank and the secondary reverse osmosis product water tank into a single enclosure, which not only optimizes the pipeline but also saves space. Each pipeline and tank is equipped with a drain pipe, and a main drain pipe is located within the skid, converging all branch drain pipes into the main drain pipe for unified drainage. The structural design of this utility model achieves an integrated design, encompassing all equipment and pipelines within a single skid, which can also be housed in a shipping container. Detailed implementation method: 1) Solution preparation: Prepare a sodium chloride solution with a TDS concentration of 50 g / L in the raw water tank. At the same time, turn on the circulation pump and continuously circulate the solution through the plate heat exchanger to ensure that the sodium chloride solution in the raw water tank is fully dissolved and the temperature rises to 25°C. The temperature, water volume, conductivity and other indicators of the raw solution in the raw water tank are measured by the temperature sensor, conductivity sensor and liquid level sensor in the water tank to meet the experimental requirements.

[0032] 2) First operating mode: Verify the final concentration limit of the first-stage high-pressure RO and the TDS of the final permeate from the pure water RO system: After the solution is prepared in the raw water tank, it is pumped into a security filter at a flow rate of 6 m³ / h via a first-stage RO booster pump. The security filter removes impurities from the water, which then enters a high-pressure plunger pump. The high-pressure plunger pump further pressurizes the solution, maintaining a flow rate of 6 m³ / h. The pressure entering the first-stage high-pressure RO system is adjusted via a regulating valve after the high-pressure plunger pump. This pressure is interlocked with the high-pressure RO system's recovery rate and permeate flow rate. The concentrate regulating valve of the first-stage high-pressure RO system is adjusted to achieve a designed system recovery rate of 5-8% and a designed flux of 8-10 LMH. The concentrate from the first-stage high-pressure RO system is returned to the raw water tank for further concentration. This process verifies the TDS content of the final concentrate after membrane concentration under extreme membrane concentration conditions. The high-pressure plunger pump outlet regulating valve adjusts according to the concentration of the feed solution to the first-stage high-pressure RO system. The outlet pressure is continuously adjusted to maintain the system recovery rate and permeate flux within the design range until the TDS concentration of the membrane concentrate reaches >240,000 mg / L. All permeate enters the permeate tank of the first-stage high-pressure RO system and is pumped into the pure water RO system through a pure water RO high-pressure pump at a flow rate of 6.3 m³ / h. The pure water RO system has a recovery rate of 8-12% and a water flux of 12-15 LMH to verify whether the TDS of the pure water RO permeate meets the requirements. Both the concentrate and permeate from the pure water RO system are returned to the permeate tank of the first-stage high-pressure RO system. The linkage between the first-stage high-pressure RO system and the pure water RO system constitutes a high-pressure membrane concentration limit test device. This device can verify the concentration endpoint of the concentrate under the limit membrane concentration state of the high-pressure membrane, and at the same time, it can further desalinate the permeate of the high-pressure RO system through pure water RO, thereby verifying that the permeate quality of the entire device meets the design requirements.

[0033] 3) Second operating mode: Verify the durability of the first-stage high-pressure RO membrane desalination, and also serve as a simulation demonstration of the entire operating process: After the solution is prepared in the raw water tank, it is pumped into the security filter at a flow rate of 6 m³ / h by the first-stage RO booster pump. The security filter removes impurities from the water, which then enters the high-pressure plunger pump. The high-pressure plunger pump further pressurizes the raw solution, maintaining a flow rate of 6 m³ / h. The pressure entering the first-stage high-pressure RO system is adjusted by the regulating valve after the high-pressure plunger pump. The pressure is interlocked with the recovery rate and permeate flow of the high-pressure RO system. By adjusting the concentrate regulating valve of the first-stage high-pressure RO system, the designed system recovery rate is 5-8%, and the designed flux is 8-10 LMH. Both the concentrate and permeate from the first-stage high-pressure RO system are returned to the raw water tank for further circulation into the first-stage high-pressure RO system, verifying the durability of the RO membrane in desalination during operation with high-salt, high-concentration wastewater. After a portion of the raw water in the pure water RO system is used as permeate from the first-stage high-pressure RO system, it is operated according to the flux and recovery rate in Mode 1. Both the permeate and concentrate are returned to the first-stage high-pressure RO permeate tank to verify the durability of the pure water RO membrane desalination and the system stability under the permeate water quality conditions after the pure water RO membrane system is in operation.

[0034] The specific embodiments described herein are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A high-concentration membrane limit testing device, comprising a raw water tank, a filter, a primary reverse osmosis membrane module, and a secondary reverse osmosis membrane module, interconnected by pipelines, characterized in that: The raw water tank is connected to the filter, which is connected to the first-stage reverse osmosis membrane module. A first-stage product water tank is located downstream of the first-stage reverse osmosis membrane module. The first-stage product water tank is connected to the second-stage reverse osmosis membrane module, and a second-stage product water tank is located downstream of the second-stage reverse osmosis membrane module. A raw water pump is installed between the raw water tank and the filter to pressurize the raw water. A first-stage reverse osmosis high-pressure pump is installed between the filter and the first-stage reverse osmosis membrane module, and a second-stage reverse osmosis high-pressure pump is installed between the first-stage product water tank and the second-stage reverse osmosis membrane module. An inlet pipe is installed on the raw water tank, and an outlet pipe is installed downstream of the second-stage product water tank. A cleaning system and a flushing system are also installed between the first-stage reverse osmosis membrane module, the first-stage reverse osmosis high-pressure pump, and the second-stage reverse osmosis membrane module, respectively. A return flow pipeline is also added between the first-stage and second-stage reverse osmosis membrane modules and the raw water tank. A temperature control system is also installed on the raw water tank.

2. The high-concentration membrane limit testing device according to claim 1, characterized in that: The reflux pipeline is provided in total with four lines: a first reflux pipeline that refluxes the permeate from the first-stage reverse osmosis membrane unit to the raw water tank; a second reflux pipeline that refluxes the concentrate from the first-stage reverse osmosis membrane unit to the raw water tank; a third reflux pipeline that refluxes the permeate from the second-stage reverse osmosis membrane unit to the permeate end of the first-stage reverse osmosis membrane unit and / or the raw water tank; and a fourth reflux pipeline that refluxes the concentrate from the second-stage reverse osmosis membrane unit to the inlet end of the first-stage reverse osmosis membrane unit and / or the raw water tank.

3. The high-concentration membrane limit testing device according to claim 1, characterized in that: The cleaning system includes a cleaning water tank and a cleaning water pump. The cleaning water tank is connected to the first-stage reverse osmosis membrane module, the first-stage reverse osmosis high-pressure pump, and the second-stage reverse osmosis membrane module, and a chemical dosing port is provided on the cleaning water tank.

4. The high-concentration membrane limit testing device according to claim 1, characterized in that: The flushing system includes a flushing water tank and a flushing water pump. The flushing water tank is connected to the first-stage reverse osmosis membrane module, the first-stage reverse osmosis high-pressure pump, and the second-stage reverse osmosis membrane module, respectively.

5. The high-concentration membrane limit testing device according to claim 1, characterized in that: The temperature control system includes a heating pump, a heat exchanger, and a thermometer. The temperature in the raw water tank is measured by the thermometer, and the heating pump and heat exchanger are controlled to turn on and off. The cold source for the heat exchanger is an external tap or refrigerant.

6. The high-concentration membrane limit testing device according to claim 1, characterized in that: The raw water tank, filter, primary reverse osmosis membrane module, secondary reverse osmosis membrane, primary product water tank, secondary product water tank, cleaning system, flushing system, and temperature control system are all skid-mounted inside the container, and electric valves are also installed on the pipelines. The electric valves and temperature control system are all controlled by an electrical control cabinet located inside the container.

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