A heavy metal wastewater separation device

Abstract

The application provides a heavy metal wastewater separation device, which comprises a water inlet pipe, an ultrafiltration buffer tank, an ultrafiltration membrane body, a nanofiltration buffer tank, a nanofiltration membrane body, a reverse osmosis buffer tank and a reverse osmosis membrane body; the water inlet pipe is provided with a water inlet for heavy metal wastewater; the heavy metal wastewater output from the ultrafiltration buffer tank passes through the ultrafiltration membrane body and is subjected to ultrafiltration treatment in the ultrafiltration membrane body to output a first filtered liquid; the first filtered liquid output from the nanofiltration buffer tank passes through the nanofiltration membrane body and is subjected to nanofiltration treatment in the nanofiltration membrane body to output a second filtered liquid; the second filtered liquid output from the reverse osmosis buffer tank passes through the reverse osmosis membrane body and is subjected to reverse osmosis treatment in the reverse osmosis membrane body to output a third filtered liquid, so that the ultrafiltration membrane body, the nanofiltration membrane body and the reverse osmosis membrane body are integrated, multi-stage filtration and separation are realized, and the separation effect of the heavy metal wastewater separation device is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of heavy metal wastewater separation devices, and in particular to a heavy metal wastewater separation device. Background Technology

[0002] With the development of technology, the treatment of industrial wastewater includes removing harmful substances and recovering heavy metal ions. Heavy metal wastewater separation devices are used to filter heavy metal ions from industrial wastewater. In the existing technology, existing heavy metal wastewater separation devices include an inlet pipe, an ultrafiltration buffer tank, and an ultrafiltration membrane. The ultrafiltration buffer tank is connected to the inlet pipe, and the ultrafiltration membrane is connected to the ultrafiltration buffer tank. Heavy metal wastewater passes through the inlet pipe, ultrafiltration buffer tank, and ultrafiltration membrane in sequence. However, it can only perform ultrafiltration treatment, resulting in poor separation effect of existing heavy metal wastewater separation devices. Utility Model Content

[0003] The purpose of this utility model is to provide a heavy metal wastewater separation device. An inlet pipe is provided for the intake of heavy metal wastewater. An ultrafiltration buffer tank is connected to the inlet pipe and contains the heavy metal wastewater output from the inlet pipe. An ultrafiltration membrane is disposed outside the ultrafiltration buffer tank and connected to it. The heavy metal wastewater output from the ultrafiltration buffer tank passes through the ultrafiltration membrane and undergoes ultrafiltration treatment to output a first filtered liquid. A nanofiltration buffer tank is disposed on one side of the ultrafiltration membrane and connected to it. The nanofiltration buffer tank contains the first filtered liquid output from the ultrafiltration membrane. The nanofiltration membrane is disposed outside the nanofiltration buffer tank and connected to it. The first filtered liquid output from the nanofiltration buffer tank... The filtered liquid passes through a nanofiltration membrane and undergoes nanofiltration treatment to output a second filtered liquid. A reverse osmosis buffer tank is located on one side of the nanofiltration membrane and is connected to the nanofiltration membrane. The reverse osmosis buffer tank is used to contain the second filtered liquid output from the nanofiltration membrane. The reverse osmosis membrane is located outside the reverse osmosis buffer tank and is connected to the reverse osmosis buffer tank. The second filtered liquid output from the reverse osmosis buffer tank passes through a reverse osmosis membrane and undergoes reverse osmosis treatment to output a third filtered liquid. This integrates ultrafiltration, nanofiltration, and reverse osmosis membranes, thereby achieving multi-stage filtration and separation, avoiding the limitation of only performing ultrafiltration treatment, and improving the separation effect of the heavy metal wastewater separation device.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a heavy metal wastewater separation device, comprising: The inlet pipe is equipped with an inlet for supplying heavy metal wastewater. An ultrafiltration buffer tank is connected to the inlet pipe and contains the heavy metal wastewater discharged through the inlet pipe; An ultrafiltration membrane body is disposed outside the ultrafiltration buffer tank and connected to the ultrafiltration buffer tank; the heavy metal wastewater output from the ultrafiltration buffer tank passes through the ultrafiltration membrane body and undergoes ultrafiltration treatment in the ultrafiltration membrane body to output the first filtered liquid; A nanofiltration buffer tank is disposed on one side of the ultrafiltration membrane body and connected to the ultrafiltration membrane body; the nanofiltration buffer tank is used to contain the first filtered liquid output from the ultrafiltration membrane body; A nanofiltration membrane body is disposed outside the nanofiltration buffer tank and connected to the nanofiltration buffer tank; the first filtered liquid output from the nanofiltration buffer tank passes through the nanofiltration membrane body and undergoes nanofiltration treatment in the nanofiltration membrane body to output the second filtered liquid; A reverse osmosis buffer tank is disposed on one side of the nanofiltration membrane body and connected to the nanofiltration membrane body; the reverse osmosis buffer tank is used to contain the second filtered liquid output through the nanofiltration membrane body; A reverse osmosis membrane body is disposed outside the reverse osmosis buffer tank and connected to the reverse osmosis buffer tank; the second filtered liquid output from the reverse osmosis buffer tank passes through the reverse osmosis membrane body and undergoes reverse osmosis treatment in the reverse osmosis membrane body to output the third filtered liquid.

[0005] Optionally, the ultrafiltration membrane, the nanofiltration membrane, and the reverse osmosis membrane are arranged sequentially along the output direction of the heavy metal wastewater; Heavy metal wastewater undergoes ultrafiltration treatment within the ultrafiltration membrane and outputs the first filtered liquid. The first filtered liquid undergoes nanofiltration treatment within the nanofiltration membrane, and the second filtered liquid is output. The second filtered liquid undergoes reverse osmosis treatment within the reverse osmosis membrane and is then output as the third filtered liquid.

[0006] Optionally, it also includes a controller, the water inlet pipe is connected to a water inlet pump, the water inlet pump is electrically connected to the controller, and the water inlet pump pumps heavy metal wastewater into the water inlet pipe during operation; The ultrafiltration buffer tank temporarily stores the heavy metal wastewater output through the inlet pipe, and connects to the ultrafiltration membrane when the heavy metal wastewater is at a first preset liquid level.

[0007] Optionally, a first inlet valve and a first product water valve are provided between the ultrafiltration buffer tank and the ultrafiltration membrane. The first inlet valve and the first product water valve are electrically connected to the controller. The first inlet valve and the first product water valve are in the open state when the heavy metal wastewater is at a first preset liquid level. Heavy metal wastewater flows by gravity and passes through the ultrafiltration membrane for solid-liquid separation. At this time, suspended solids, colloids and macromolecular organic matter in the water are removed, and the first filtered liquid is formed.

[0008] Optionally, the first filtered liquid is output from the ultrafiltration membrane to the nanofiltration buffer tank; The first filtered liquid is at the second preset liquid level of the nanofiltration buffer tank, the second inlet valve and the second product water valve between the nanofiltration buffer tank and the nanofiltration membrane are in the open state, and the second cleaning valve between the nanofiltration buffer tank and the nanofiltration membrane is in the closed state.

[0009] Optionally, the nanofiltration buffer tank is connected to a nanofiltration pressurization pump, which is electrically connected to the controller. The nanofiltration pressurization pump applies pressure to the first filtered liquid, which enters the nanofiltration membrane body under the pressure. The nanofiltration membrane body is used to separate the first filtered liquid to form a second filtered liquid.

[0010] Optionally, the second filtered liquid is output from the nanofiltration membrane to the reverse osmosis buffer tank; The second filtered liquid is at the third preset liquid level of the reverse osmosis buffer tank, the third inlet valve and the third product water valve between the reverse osmosis buffer tank and the reverse osmosis membrane are in the open state, and the third cleaning valve between the reverse osmosis buffer tank and the reverse osmosis membrane is in the closed state.

[0011] Optionally, the reverse osmosis buffer tank is connected to a reverse osmosis pressurization pump, which is electrically connected to the controller. The reverse osmosis pressurization pump applies pressure to the second filtered liquid, which then enters the reverse osmosis membrane under the pressure.

[0012] Optionally, the ultrafiltration membrane is connected to a first cleaning valve, which is signal-connected to the controller and used to connect to an external clean water source. When the first cleaning valve is opened, clean water enters from the product water port of the ultrafiltration membrane to wash the membrane, and the rinsed wastewater is discharged from the concentrate outlet.

[0013] Optionally, the nanofiltration membrane is connected to a first air valve, and the reverse osmosis membrane is connected to a second air valve. Both the first and second air valves are signal-connected to an air compressor and the controller, and are used to control the gas to purge the corresponding membranes.

[0014] Compared with the prior art, the beneficial effects of this utility model are: This invention provides a heavy metal wastewater separation device. An inlet pipe is provided for the intake of heavy metal wastewater. An ultrafiltration buffer tank is connected to the inlet pipe and contains the heavy metal wastewater output from the inlet pipe. An ultrafiltration membrane is disposed outside the ultrafiltration buffer tank and connected to it. The heavy metal wastewater output from the ultrafiltration buffer tank passes through the ultrafiltration membrane and undergoes ultrafiltration treatment to output a first filtered liquid. A nanofiltration buffer tank is disposed on one side of the ultrafiltration membrane and connected to it. The nanofiltration buffer tank contains the first filtered liquid output from the ultrafiltration membrane. The nanofiltration membrane is disposed outside the nanofiltration buffer tank and connected to it. The first filtered liquid output from the nanofiltration buffer tank... The liquid passes through a nanofiltration membrane and undergoes nanofiltration treatment to output the second filtered liquid. A reverse osmosis buffer tank is located on one side of the nanofiltration membrane and is connected to it. The reverse osmosis buffer tank is used to contain the second filtered liquid output from the nanofiltration membrane. The reverse osmosis membrane is located outside the reverse osmosis buffer tank and is connected to it. The second filtered liquid output from the reverse osmosis buffer tank passes through the reverse osmosis membrane and undergoes reverse osmosis treatment to output the third filtered liquid. This integrates ultrafiltration, nanofiltration, and reverse osmosis membranes, thereby achieving multi-stage filtration and separation, avoiding the limitation of only performing ultrafiltration treatment, and improving the separation effect of the heavy metal wastewater separation device. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0017] Figure 1 A schematic diagram of a heavy metal wastewater separation device according to an embodiment of this application is shown.

[0018] Figure 2 A schematic diagram of the ultrafiltration buffer tank and ultrafiltration membrane body of a heavy metal wastewater separation device according to an embodiment of this application is shown.

[0019] Figure 3 A schematic diagram of the nanofiltration buffer tank and nanofiltration membrane body of a heavy metal wastewater separation device according to an embodiment of this application is shown.

[0020] Figure 4A schematic diagram of the reverse osmosis buffer tank and reverse osmosis membrane body of a heavy metal wastewater separation device according to a second embodiment of this application is shown.

[0021] Figure Labels 100. Heavy metal wastewater separation device; 10. Water inlet pipe; 10a. Water inlet; 11. Water pump; 20. Ultrafiltration buffer tank; 21. First inlet valve; 22. First product water valve; 23. First cleaning valve; 30. Ultrafiltration membrane body; 40. Nanofiltration buffer tank; 41. Second inlet valve; 42. Second product water valve; 43. Second cleaning valve; 44. Nanofiltration booster pump; 50. Nanofiltration membrane; 60. Reverse osmosis buffer tank; 61. Third inlet valve; 62. Third product water valve; 63. Third cleaning valve; 64. Reverse osmosis booster pump; 70. Reverse osmosis membrane. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] Please refer to the attached document. Figures 1-4 This application provides a heavy metal wastewater separation device 100, which is used for multi-stage filtration and separation of industrial wastewater.

[0024] Please refer to the attached document. Figures 1-4In this embodiment, the heavy metal wastewater separation device 100 includes an inlet pipe 10, an ultrafiltration buffer tank 20, an ultrafiltration membrane 30, a nanofiltration buffer tank 40, a nanofiltration membrane 50, a reverse osmosis buffer tank 60, and a reverse osmosis membrane 70. The inlet pipe 10 is provided with an inlet 10a for supplying heavy metal wastewater. The ultrafiltration buffer tank 20 is connected to the inlet pipe 10 and contains the heavy metal wastewater discharged through the inlet pipe 10. The ultrafiltration membrane 30 is provided with... A nanofiltration buffer tank 40 is placed outside and connected to the ultrafiltration buffer tank 20; the heavy metal wastewater output from the ultrafiltration buffer tank 20 passes through the ultrafiltration membrane 30 and undergoes ultrafiltration treatment to output the first filtered liquid; the nanofiltration buffer tank 40 is located on one side of the ultrafiltration membrane 30 and connected to the ultrafiltration membrane 30; the nanofiltration buffer tank 40 is used to contain the first filtered liquid output from the ultrafiltration membrane 30; the nanofiltration membrane 50 is placed on the nanofiltration buffer tank 20. The first filtered liquid output from the nanofiltration buffer tank 40 passes through the nanofiltration membrane 50 and undergoes nanofiltration treatment to output the second filtered liquid. A reverse osmosis buffer tank 60 is located on one side of the nanofiltration membrane 50 and connected to it. The reverse osmosis buffer tank 60 is used to contain the second filtered liquid output from the nanofiltration membrane 50. A reverse osmosis membrane 70 is located outside the reverse osmosis buffer tank 60 and connected to it. The second filtered liquid output from the reverse osmosis buffer tank 60 passes through the reverse osmosis membrane 70 and undergoes reverse osmosis treatment to output the third filtered liquid. This integrates the ultrafiltration membrane 30, nanofiltration membrane 50, and reverse osmosis membrane 70, thereby achieving multi-stage filtration and separation, avoiding the limitation of only ultrafiltration treatment, and improving the separation effect of the heavy metal wastewater separation device 100.

[0025] Please refer to the attached document. Figures 1-4 In this embodiment of the application, the water inlet pipe 10 is provided with an inlet 10a, which is used to allow heavy metal wastewater to enter; so that the heavy metal wastewater can flow into the water inlet pipe 10 through the inlet 10a.

[0026] The ultrafiltration buffer tank 20 is connected to the inlet pipe 10 and contains the heavy metal wastewater output through the inlet pipe 10; so that the heavy metal wastewater can flow through the inlet pipe 10 into the ultrafiltration buffer tank 20, thereby facilitating the storage of heavy metal wastewater in the ultrafiltration buffer tank 20.

[0027] The ultrafiltration membrane 30 is disposed outside the ultrafiltration buffer tank 20 and connected to the ultrafiltration buffer tank 20; the heavy metal wastewater output from the ultrafiltration buffer tank 20 passes through the ultrafiltration membrane 30 and undergoes ultrafiltration treatment in the ultrafiltration membrane 30 to output the first filtered liquid; thereby achieving the first filtration of heavy metal wastewater.

[0028] The nanofiltration buffer tank 40 is disposed on one side of the ultrafiltration membrane 30 and is connected to the ultrafiltration membrane 30; the nanofiltration buffer tank 40 is used to contain the first filtered liquid output from the ultrafiltration membrane 30; so that the first filtered liquid can flow through the ultrafiltration membrane 30 into the nanofiltration buffer tank 40, thereby facilitating the storage of the first filtered liquid in the nanofiltration buffer tank 40.

[0029] The nanofiltration membrane body 50 is disposed outside the nanofiltration buffer tank 40 and connected to the nanofiltration buffer tank 40; the first filtered liquid output from the nanofiltration buffer tank 40 passes through the nanofiltration membrane body 50 and undergoes nanofiltration treatment in the nanofiltration membrane body 50 to output the second filtered liquid; thereby realizing the second filtration of heavy metal wastewater.

[0030] The reverse osmosis buffer tank 60 is disposed on one side of the nanofiltration membrane body 50 and is connected to the membrane body 50; the reverse osmosis buffer tank 60 is used to contain the second filtered liquid output from the nanofiltration membrane body 50; so that the second filtered liquid can flow through the nanofiltration membrane body 50 into the reverse osmosis buffer tank 60, thereby facilitating the storage of the second filtered liquid in the reverse osmosis buffer tank 60.

[0031] The reverse osmosis membrane 70 is located outside the reverse osmosis buffer tank 60 and is connected to the reverse osmosis buffer tank 60. The second filtered liquid output from the reverse osmosis buffer tank 60 passes through the reverse osmosis membrane 70 and undergoes reverse osmosis treatment to output the third filtered liquid, thereby achieving the third filtration of heavy metal wastewater. This integrates the ultrafiltration membrane 30, nanofiltration membrane 50, and reverse osmosis membrane 70, thereby achieving multi-stage filtration and separation, avoiding the limitation of only ultrafiltration treatment, and improving the separation effect of the heavy metal wastewater separation device 100.

[0032] In this embodiment, the ultrafiltration membrane 30, the nanofiltration membrane 50, and the reverse osmosis membrane 70 are arranged sequentially along the output direction of the heavy metal wastewater, so that the heavy metal wastewater can pass through the ultrafiltration membrane 30, the nanofiltration membrane 50, and the reverse osmosis membrane 70 in sequence.

[0033] Heavy metal wastewater undergoes ultrafiltration treatment in ultrafiltration membrane 30 and outputs the first filtered liquid; the first filtered liquid undergoes nanofiltration treatment in nanofiltration membrane 50 and outputs the second filtered liquid; the second filtered liquid undergoes reverse osmosis treatment in reverse osmosis membrane 70 and outputs the third filtered liquid. This allows heavy metal wastewater to achieve three-stage filtration and separation through ultrafiltration membrane 30, nanofiltration membrane 50, and reverse osmosis membrane 70, avoiding the need for only ultrafiltration treatment and improving the separation effect of heavy metal wastewater separation device 100.

[0034] In this embodiment, the inlet pipe 10 is connected to an inlet pump 11, which pumps heavy metal wastewater into the inlet pipe 10 during operation, so that the inlet pipe 10 can transfer the heavy metal wastewater to the ultrafiltration buffer tank 20 under the action of the inlet pump 11.

[0035] The ultrafiltration buffer tank 20 temporarily stores the heavy metal wastewater output through the inlet pipe 10, and connects to the ultrafiltration membrane 30 when the heavy metal wastewater is at the first preset liquid level, so that the heavy metal wastewater at the first preset liquid level can flow to the ultrafiltration membrane 30, thereby facilitating the ultrafiltration treatment of the heavy metal wastewater in the ultrafiltration membrane 30.

[0036] In this embodiment, a first inlet valve 21 and a first product water valve 22 are provided between the ultrafiltration buffer tank 20 and the ultrafiltration membrane 30, so that the first inlet valve 21 and the first product water valve 22 can control the flow of heavy metal wastewater in the ultrafiltration buffer tank 20 and the ultrafiltration membrane 30. The first inlet valve 21 and the first product water valve 22 are in the open state when the heavy metal wastewater is at a first preset liquid level. The heavy metal wastewater flows by gravity and can pass through the ultrafiltration membrane 30, so that the heavy metal wastewater is transferred from the ultrafiltration buffer tank 20 to the ultrafiltration membrane 30 for solid-liquid separation. At this time, the heavy metal wastewater removes suspended solids, colloids and macromolecular organic matter from the water and forms the first filtered liquid, thereby realizing the first filtration of heavy metal wastewater.

[0037] The ultrafiltration membrane body 30 is connected to a first cleaning valve 23. The first cleaning valve 23 is connected to the controller signal and is used to connect to an external clean water source. When the first cleaning valve 23 is opened, clean water enters from the product water port of the ultrafiltration membrane body 30 to wash the membrane body. The wastewater after rinsing is discharged from the concentrate outlet.

[0038] In this embodiment, the first filtered liquid is output from the ultrafiltration membrane 30 to the nanofiltration buffer tank 40. The first filtered liquid is at the second preset liquid level in the nanofiltration buffer tank 40. The second inlet valve 41 and the second product water valve 42, located between the nanofiltration buffer tank 40 and the nanofiltration membrane 50, are open. The second cleaning valve 43, located between the nanofiltration buffer tank 40 and the nanofiltration membrane 50, is closed, so that the first filtered liquid in the nanofiltration buffer tank 40 can flow to the nanofiltration membrane 50. The nanofiltration membrane 50 is also connected to a chemical cleaning system, which includes a chemical cleaning tank and connecting pipelines. When chemical cleaning of the nanofiltration membrane is required, the second cleaning valve 43 is opened. The chemical solution in the chemical cleaning tank, driven by the cleaning pump (or using the existing pump in the system), enters from the product water port of the nanofiltration membrane 50 to soak or circulate and clean the membrane fibers. The reacted chemical solution is discharged from the concentrate outlet and enters the nanofiltration concentrate tank.

[0039] In this embodiment, the nanofiltration buffer tank 40 is connected to a nanofiltration pressurization pump 44. The nanofiltration pressurization pump 44 applies pressure to the first filtered liquid, which then enters the nanofiltration membrane 50 under this pressure. The nanofiltration membrane 50 separates the first filtered liquid to form a second filtered liquid, thereby achieving a second filtration of heavy metal wastewater. The nanofiltration membrane 50 can separate divalent ions and some monovalent ions.

[0040] In this embodiment, the second filtered liquid is output from the nanofiltration membrane 50 to the reverse osmosis buffer tank 60. The second filtered liquid is at a third preset level in the reverse osmosis buffer tank 60. The third inlet valve 61 and the third product water valve 62, located between the reverse osmosis buffer tank 60 and the reverse osmosis membrane 70, are open, while the third cleaning valve 63, located between the reverse osmosis buffer tank 60 and the reverse osmosis membrane 70, is closed, so that the second filtered liquid in the reverse osmosis buffer tank 60 can flow to the reverse osmosis membrane 70. The reverse osmosis membrane 70 is connected to an air rinsing system, which includes an air compressor and a second air valve connected to a controller signal. When air rinsing of the reverse osmosis membrane is required, the second air valve is opened, and the gas generated by the air compressor enters from the product water port of the reverse osmosis membrane 70 to purge the membrane fibers. The contaminants carried by the airflow are discharged from the concentrate outlet and enter the reverse osmosis concentrate tank.

[0041] In this embodiment, the reverse osmosis buffer tank 60 is connected to a reverse osmosis pressurization pump 64. The reverse osmosis pressurization pump 64 applies pressure to the second filtered liquid, and the second filtered liquid enters the reverse osmosis membrane body 70 under the action of the pressure, so that the reverse osmosis membrane body 70 can perform reverse osmosis treatment on the second filtered liquid.

[0042] In this embodiment, the reverse osmosis membrane 70 is used to separate the second filtered liquid to form a third filtered liquid, thereby achieving three-stage filtration and separation of heavy metal wastewater. The reverse osmosis membrane 70 performs the finest separation, removing almost all dissolved salts, resulting in the final product water.

[0043] In this embodiment, the separation degree of the reverse osmosis membrane 70 is greater than that of the nanofiltration membrane 50, so that the separation degree of heavy metal wastewater is better and better, thus ensuring the separation effect of heavy metal wastewater.

[0044] The heavy metal wastewater separation device 100 also includes a controller, which in this embodiment is a PLC. The controller is connected to the frequency converters of the inlet pump 11, the nanofiltration booster pump 44, and the reverse osmosis booster pump 64. These frequency converters are electrically connected to the corresponding pumps to control their operation. The concentrate outlets of the nanofiltration membrane 50 and the reverse osmosis membrane 70 are respectively equipped with electric concentrate proportional valves connected to the controller. The ultrafiltration buffer tank 20, the nanofiltration buffer tank 40, and the reverse osmosis buffer tank 60 are all equipped with level sensors connected to the controller. A pH meter is installed between the ultrafiltration buffer tank 20 and the ultrafiltration membrane 30, between the nanofiltration buffer tank 40 and the nanofiltration membrane 50, between the reverse osmosis buffer tank 60 and the reverse osmosis membrane 70, and on the permeate pipeline of the reverse osmosis membrane 70. A flow meter is installed on the concentrate line of nanofiltration membrane 50 and a flow meter is installed on the concentrate line of reverse osmosis membrane 70. These level sensors, pH meters and flow meters are all connected to the controller signal to monitor system parameters in real time. The controller stabilizes the system pressure and protects the membrane components by coordinating the adjustment of the frequency converter and the electric concentrate proportional valve, thus forming a PLC control system. That is, each membrane is connected to a pump, and each pump is controlled by a separate frequency converter. The frequency converter can be adjusted in the PLC control system.

[0045] The main components of the heavy metal wastewater separation device 100 that come into contact with the wastewater, including the ultrafiltration buffer tank 20, nanofiltration buffer tank 40, reverse osmosis buffer tank 60, connecting pipelines, and membrane housings, are all made of high-pressure resistant and acid- and alkali-resistant materials. This characteristic allows the system to eliminate the need for pretreatment when treating electroplating wastewater, thereby reducing the consumption of chemicals and the production of sludge. Under the intelligent control of the controller, the system produces stable water quality with a high removal rate of heavy metal ions. The produced water can be reused for workshop cleaning, realizing the recycling of water resources.

[0046] First, the inlet pump is turned on (the pump is connected to an intelligent frequency converter, and its operating frequency can be adjusted within the PLC system). The first inlet valve 21 is opened, and wastewater enters the system, passing through the first flow meter into the ultrafiltration buffer tank, where the flow rate reading is displayed. When the liquid level reaches the set value, the ultrafiltration liquid level sensor alarm is triggered, and the signal is transmitted to the PLC system. The second inlet valve 41 is opened, the first product water valve 22 is opened, and the first cleaning valve is closed. The wastewater flows by gravity through the pH meter 1 into the ultrafiltration membrane 30. After separation by the ultrafiltration membrane, the product water enters the nanofiltration buffer tank 40.

[0047] Secondly, when the liquid level in the nanofiltration buffer tank 40 reaches the set value, the nanofiltration liquid level sensor alarm is triggered, and the signal is transmitted to the PLC system. The third inlet valve 61 opens, the second product water valve opens, the second cleaning valve closes, and the nanofiltration pressurization pump starts to operate (the pump is connected to an intelligent frequency converter, and the operating frequency can be adjusted within the PLC system). The ultrafiltration permeate enters the nanofiltration membrane 50 through the second pH meter. After separation by the nanofiltration membrane 50, the nanofiltration concentrate enters the nanofiltration concentrate tank through the concentrate proportioning valve 1 (the concentrate proportioning valve is an electric angle valve, and the angle can be adjusted within the PLC system) and the second flow meter. The opening ratio of the proportioning valve can be set by the PLC system to regulate the flow rate and the operating pressure of the nanofiltration system. The nanofiltration permeate enters the reverse osmosis buffer tank.

[0048] Finally, when the reverse osmosis buffer tank level reaches the set value, the reverse osmosis level sensor alarm is triggered, and the signal is transmitted to the PLC system. The third inlet valve 61 opens, the third product water valve 62 opens, the third cleaning valve 63 closes, and the reverse osmosis booster pump starts operating (the pump is connected to an intelligent frequency converter, and the operating frequency can be adjusted within the PLC system). The nanofiltration permeate enters the reverse osmosis membrane body through the third pH meter. After separation by the reverse osmosis membrane, the reverse osmosis concentrate enters the reverse osmosis concentrate tank through the concentrate proportioning valve and flow meter. The opening ratio of the proportioning valve can be set by the PLC system to regulate the flow rate and the operating pressure of the reverse osmosis system. The reverse osmosis permeate enters the product water tank through the fourth pH meter.

[0049] Compared with the prior art, the beneficial effects of this utility model are: This utility model provides a heavy metal wastewater separation device 100. An inlet pipe 10 has an inlet 10a for supplying heavy metal wastewater. An ultrafiltration buffer tank 20 is connected to the inlet pipe 10 and contains the heavy metal wastewater discharged through the inlet pipe 10. An ultrafiltration membrane 30 is disposed outside the ultrafiltration buffer tank 20 and connected to it. The heavy metal wastewater discharged from the ultrafiltration buffer tank 20 passes through the ultrafiltration membrane 30 and undergoes ultrafiltration treatment to output a first filtered liquid. A nanofiltration buffer tank 40 is disposed on one side of the ultrafiltration membrane 30 and connected to it. The nanofiltration buffer tank 40 contains the first filtered liquid discharged through the ultrafiltration membrane 30. A nanofiltration membrane 50 is disposed outside the nanofiltration buffer tank 40 and connected to it. The first filtered liquid discharged through the nanofiltration buffer tank 40... The first filtered liquid passes through the nanofiltration membrane 50 and undergoes nanofiltration treatment to output the second filtered liquid. A reverse osmosis buffer tank 60 is located on one side of the nanofiltration membrane 50 and connected to it. The reverse osmosis buffer tank 60 is used to contain the second filtered liquid output from the nanofiltration membrane 50. A reverse osmosis membrane 70 is located outside the reverse osmosis buffer tank 60 and connected to it. The second filtered liquid output from the reverse osmosis buffer tank 60 passes through the reverse osmosis membrane 70 and undergoes reverse osmosis treatment to output the third filtered liquid. This integrates the ultrafiltration membrane 30, nanofiltration membrane 50, and reverse osmosis membrane 70, thereby achieving multi-stage filtration and separation, avoiding the limitation of only ultrafiltration treatment, and improving the separation effect of the heavy metal wastewater separation device 100.

[0050] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0051] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0052] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A heavy metal wastewater separation device, characterized in that, include: The inlet pipe is equipped with an inlet for supplying heavy metal wastewater. An ultrafiltration buffer tank is connected to the inlet pipe and contains the heavy metal wastewater discharged through the inlet pipe; An ultrafiltration membrane body is disposed outside the ultrafiltration buffer tank and connected to the ultrafiltration buffer tank; The heavy metal wastewater output from the ultrafiltration buffer tank passes through the ultrafiltration membrane and undergoes ultrafiltration treatment to output the first filtered liquid. A nanofiltration buffer tank is disposed on one side of the ultrafiltration membrane body and connected to the ultrafiltration membrane body; the nanofiltration buffer tank is used to contain the first filtered liquid output from the ultrafiltration membrane body; A nanofiltration membrane body is disposed outside the nanofiltration buffer tank and connected to the filter buffer tank; The first filtered liquid output from the nanofiltration buffer tank passes through the nanofiltration membrane and undergoes nanofiltration treatment in the nanofiltration membrane to output the second filtered liquid; A reverse osmosis buffer tank is disposed on one side of the nanofiltration membrane body and connected to the nanofiltration membrane body; the reverse osmosis buffer tank is used to contain the second filtered liquid output through the nanofiltration membrane body; A reverse osmosis membrane body is disposed on the outside of the reverse osmosis buffer tank and connected to the reverse osmosis buffer tank; The second filtered liquid output from the reverse osmosis buffer tank passes through the reverse osmosis membrane and undergoes reverse osmosis treatment to output the third filtered liquid.

2. The heavy metal wastewater separation device according to claim 1, characterized in that, The ultrafiltration membrane, the nanofiltration membrane, and the reverse osmosis membrane are arranged sequentially along the output direction of the heavy metal wastewater; Heavy metal wastewater undergoes ultrafiltration treatment within the ultrafiltration membrane and outputs the first filtered liquid. The first filtered liquid undergoes nanofiltration treatment within the nanofiltration membrane, and the second filtered liquid is output. The second filtered liquid undergoes reverse osmosis treatment within the reverse osmosis membrane and is then output as the third filtered liquid.

3. The heavy metal wastewater separation device according to claim 2, characterized in that, It also includes a controller, and the water inlet pipe is connected to a water inlet pump. The water inlet pump is electrically connected to the controller. During operation, the water inlet pump pumps heavy metal wastewater into the water inlet pipe. The ultrafiltration buffer tank temporarily stores the heavy metal wastewater output through the inlet pipe, and connects to the ultrafiltration membrane when the heavy metal wastewater is at a first preset liquid level.

4. The heavy metal wastewater separation device according to claim 3, characterized in that, A first inlet valve and a first product water valve are provided between the ultrafiltration buffer tank and the ultrafiltration membrane. The first inlet valve and the first product water valve are electrically connected to the controller. The first inlet valve and the first product water valve are in the open state when the heavy metal wastewater is at a first preset liquid level. Heavy metal wastewater flows by gravity and passes through the ultrafiltration membrane for solid-liquid separation. At this time, suspended solids, colloids and macromolecular organic matter in the water are removed, and the first filtered liquid is formed.

5. The heavy metal wastewater separation device according to claim 3, characterized in that, The first filtered liquid is output from the ultrafiltration membrane to the nanofiltration buffer tank; The first filtered liquid is at the second preset liquid level of the nanofiltration buffer tank, the second inlet valve and the second product water valve between the nanofiltration buffer tank and the nanofiltration membrane are in the open state, and the second cleaning valve between the nanofiltration buffer tank and the nanofiltration membrane is in the closed state.

6. The heavy metal wastewater separation device according to claim 5, characterized in that, The nanofiltration buffer tank is connected to a nanofiltration pressurizing pump, which is electrically connected to the controller. The nanofiltration pressurizing pump applies pressure to the first filtered liquid, and the first filtered liquid enters the nanofiltration membrane body under the action of the pressure. The nanofiltration membrane is used to separate the first filtered liquid to form a second filtered liquid.

7. The heavy metal wastewater separation device according to claim 3, characterized in that, The second filtered liquid is output from the nanofiltration membrane to the reverse osmosis buffer tank; The second filtered liquid is at the third preset liquid level of the reverse osmosis buffer tank, the third inlet valve and the third product water valve between the reverse osmosis buffer tank and the reverse osmosis membrane are in the open state, and the third cleaning valve between the reverse osmosis buffer tank and the reverse osmosis membrane is in the closed state.

8. The heavy metal wastewater separation device according to claim 7, characterized in that, The reverse osmosis buffer tank is connected to a reverse osmosis pressurization pump, which is electrically connected to the controller. The reverse osmosis pressurization pump applies pressure to the second filtered liquid, which then enters the reverse osmosis membrane under this pressure.

9. The heavy metal wastewater separation device according to claim 3, characterized in that, The ultrafiltration membrane is connected to a first cleaning valve, which is signal-connected to the controller and used to connect to an external clean water source. When the first cleaning valve is opened, clean water enters from the product water port of the ultrafiltration membrane to wash the membrane. The wastewater after rinsing is discharged from the concentrate outlet.

10. The heavy metal wastewater separation device according to claim 3, characterized in that, The nanofiltration membrane is connected to a first air valve, and the reverse osmosis membrane is connected to a second air valve. Both the first and second air valves are connected to the air compressor and the controller for signal control of the gas to purge the corresponding membranes.

Images