Sewage treatment system
The wastewater treatment system, which utilizes PLC modules and electrochemical reactions, solves the problems of high energy consumption and secondary pollution associated with traditional wastewater treatment, achieving efficient and environmentally friendly wastewater treatment.
Patent Information
- Application Number
- CN202520571790.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-03-06
- Estimated Expiration
- 2035-03-28
AI Technical Summary
Traditional wastewater treatment methods are energy-intensive, costly, and cause secondary pollution, making them inefficient for treating large volumes of low-concentration chemical wastewater.
It employs PLC modules, frequency converter modules, programmable electrolysis modules, three-phase power supply modules, temperature and pressure sensor modules, human-machine interaction modules, concentration acquisition modules, water pumps, and electrolysis cells to remove harmful substances from wastewater through electrochemical reactions, and combines IoT technology for remote monitoring.
It improves wastewater treatment efficiency, reduces energy consumption and operating costs, reduces secondary pollution, and meets environmental protection requirements.
Smart Images
Figure CN223973921U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of organic wastewater treatment technology, and in particular to a wastewater treatment system. Background Technology
[0002] With rapid industrialization, wastewater discharge has become an increasingly serious problem, posing a significant threat to the environment and human health. Traditional wastewater treatment methods include physical adsorption and chemical oxidation. Physical adsorption mainly removes various pollutants from wastewater through the physical and chemical adsorption properties of adsorbents, but the adsorbents need to be replaced or regenerated regularly, increasing treatment costs. Chemical oxidation uses the oxidation effect of oxidants to convert recalcitrant organic matter into readily degradable organic matter or completely oxidize it into CO2 and H2O. However, this method is energy-intensive and costly, making it unsuitable for treating large volumes and relatively low concentrations of chemical wastewater.
[0003] Furthermore, wastewater treatment processes generate secondary pollution problems such as odorous gases, noise, and solid waste, which must be addressed in the environmental impact assessments of urban wastewater treatment plants. In terms of energy consumption, the average electricity consumption of urban wastewater treatment plants in my country is 0.29 kWh / m³. 3 The current level of wastewater treatment is far higher than that of developed countries, indicating enormous potential for energy conservation. Therefore, developing a highly efficient and environmentally friendly wastewater treatment system and its control system is of paramount importance. This will not only improve wastewater treatment efficiency and reduce energy consumption but also minimize secondary pollution, thus possessing significant practical value and application potential. Summary of the Invention
[0004] In order to overcome the shortcomings and deficiencies of the above-mentioned technologies, the purpose of this utility model is to provide a sewage treatment system.
[0005] The objective of this utility model is achieved through the following technical solution.
[0006] A wastewater treatment system includes: a PLC module, a frequency converter module, a programmable electrolysis module, a three-phase power supply module, a temperature and pressure sensor module, a human-machine interface module, a concentration acquisition module, a water pump, and an electrolysis cell, wherein...
[0007] The three-phase power supply module is used to provide power to the frequency converter module and the programmable electrolysis module;
[0008] Under the control of the PLC module, the frequency converter module delivers the frequency-converted electrical energy to the water pump and controls the speed of the water pump;
[0009] The PLC module is model EASY320. The A1 interface of the PLC module outputs a positive voltage signal from the 485 bus, and the A2 interface of the PLC module outputs a negative voltage signal from the 485 bus.
[0010] The programmable electrolysis module comprises at least one unit, each used to electrolyze wastewater in the electrolysis cell under the control of a PLC module. Each programmable electrolysis module includes an electrolysis electrode and a programmable power supply. The electrolysis electrode includes an anode and a cathode, and is disposed within the electrolysis cell. The programmable power supply is an ANS605D model. The F1 interface of the programmable power supply is connected to the A1 interface of the PLC module, the F2 interface of the programmable power supply is connected to the A2 interface of the PLC module, the F3 interface of the programmable power supply is connected to the three-phase power supply module, and the F4 interface of the programmable power supply is grounded. The programmable power supply is connected to the anode and cathode respectively via + / - interfaces.
[0011] The temperature and pressure sensor module is used to measure the temperature and pressure of the wastewater in the electrolysis cell and transmit the data to the PLC module; the water pump is used to pump the wastewater to be electrolyzed into the electrolysis cell; and the concentration acquisition module is used to acquire the concentration of the substances to be degraded in the wastewater in the electrolysis cell and transmit the data wirelessly to the human-machine interaction module.
[0012] The human-machine interface module is electrically connected to the PLC module.
[0013] The above technical solution also includes: a 24V power supply module, a three-phase power supply module for providing power to the 24V power supply module, and the 24V power supply module converting the power into 24V DC power to power the PLC module, the human-machine interaction module and the temperature and pressure sensor module.
[0014] In the above technical solution, the temperature and pressure sensor module includes: a temperature sensor DH25-G1 / 4 and a pressure sensor M20*1.59. The E2 interface of the temperature sensor is connected to the A1 interface of the PLC module, the E1 interface of the temperature sensor is connected to the A2 interface of the PLC module, the E3 interface of the temperature sensor is grounded, and the E4 interface of the temperature sensor is connected to the positive terminal of the 24V power supply module.
[0015] The pressure sensor's D2 interface is connected to the PLC module's A1 interface, the pressure sensor's D1 interface is connected to the PLC module's A2 interface, the pressure sensor's D3 interface is grounded, and the pressure sensor's D4 interface is connected to the positive terminal of the 24V power supply module.
[0016] In the above technical solution, the three-phase power module includes: L1 line, L2 line, L3 line, N line and PE line. Among them, L1 line, L2 line and L3 line are all connected to 380V AC power. L1 line is the main power line, L2 line is the auxiliary power line, L3 line is the third phase line in the three-phase power supply, N line is the neutral line and PE line is the ground line.
[0017] In the above technical solution, the F3 interface of the programmable power supply is connected to the L3 line via the air switch U10.
[0018] In the above technical solution, the human-machine interaction module includes: a touch screen FE7070E-4G and an antenna T2. The touch screen's C1 interface is connected to the PLC module's A5 interface, its C2 interface is connected to the PLC module's A4 interface, its C3 interface is grounded, its C4 interface is connected to the positive terminal of the 24V power supply module, and its C5 interface is connected to the PLC module's A3 interface. The touch screen's C6 and C7 interfaces are connected to the antenna T2. The antenna T2 is used to wirelessly receive data acquired by the concentration acquisition module.
[0019] In the above technical solution, the inverter module is model MD290 1.5. The B10 interface of the inverter module is connected to the A14 interface of the PLC module; the B1 interface of the inverter module is connected to the A1 interface of the PLC module; the B2 interface of the inverter module is connected to the A2 interface of the PLC module; and the B3 interface of the inverter module is grounded. The B4, B5, and B6 interfaces of the inverter module are connected to the L3, L2, and L1 lines of the three-phase power supply module in sequence, respectively. The B7, B8, and B9 interfaces of the inverter module are connected to the W, V, and U interfaces of the three-phase asynchronous motor of the water pump in sequence, respectively.
[0020] In the above technical solution, the model of the 24V power module is EDR-120-24. The H1 interface of the 24V power module is connected to the air switch U12 and then connected to the L3 line for power supply. The H2 interface of the 24V power module is grounded. The H3 interface of the 24V power module outputs 24V negative, and the H4 interface of the 24V power module outputs 24V positive.
[0021] In the above technical solution, the A0, A6, and A9 interfaces of the PLC module are grounded; the A8 and A10 interfaces of the PLC module are both connected to the positive terminal of the 24V power supply module; the A11 interface of the PLC module is first connected to button U7 and then grounded to control the PLC module to turn on; the A12 interface of the PLC module is first connected to button U8 and then grounded to turn off the PLC module; and the A13 interface of the PLC module is first connected to button U9 and then grounded.
[0022] In the above technical solution, the three-phase power supply module also includes a buzzer T1. The negative terminal of the buzzer T1 is connected to the N line, and the positive terminal of the buzzer T1 is connected to the path between the push button switch SW3 and the air switch U2 through the push button switch SW4. The L1 line and the N line are also connected to the contactor coil L4 through the key switch U4.
[0023] Compared with the prior art, the present invention has the following beneficial effects:
[0024] 1. This invention utilizes a highly efficient electrochemical reaction principle, which, compared to traditional wastewater treatment methods, can remove harmful substances from wastewater more quickly, significantly improving treatment efficiency. Simultaneously, by reducing the use of chemical agents and avoiding secondary pollution, it better meets environmental protection requirements and is beneficial to protecting the ecological environment.
[0025] 2. The frequency converter module can adjust the power output according to actual needs, and the programmable electrolysis module can also be increased or decreased according to actual conditions. Different programmable electrolysis modules can execute different electrolysis voltages, which reduces energy consumption and operating costs. Attached Figure Description
[0026] Figure 1 This is a connection diagram of the wastewater treatment system of this utility model;
[0027] Figure 2 This is a schematic diagram of the wiring connection of the wastewater treatment system of this utility model;
[0028] Figure 3 This is a schematic diagram of the wiring connection for a three-phase power module;
[0029] Figure 4 This is a schematic diagram of the circuit connection for the temperature and pressure sensor module.
[0030] Figure 5 This is a schematic diagram of the circuit connections for a programmable electrolysis module;
[0031] Figure 6 A schematic diagram of the wiring connections for the human-computer interaction module;
[0032] Figure 7 This is a schematic diagram of the wiring connections for the frequency converter module and the terminal blocks;
[0033] Figure 8 This is a schematic diagram of the wiring connection for a 24V power supply module.
[0034] Figure 9 This is a schematic diagram of the PLC module wiring.
[0035] In the diagram: 101: PLC module, 102: Frequency converter module, 103: 24V power supply module, 104: Programmable electrolysis module, 106: Three-phase power supply module, 107: Temperature and pressure sensor module, 108: Human-machine interface module, 109: Concentration acquisition module, 110: Water pump. Detailed Implementation
[0036] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments.
[0037] Example 1
[0038] like Figure 1As shown, a wastewater treatment system includes: a PLC module 101, a frequency converter module 102, a 24V power supply module 103, a programmable electrolysis module 104, a three-phase power supply module 106, a temperature and pressure sensor module 107, a human-machine interface module 108, a concentration acquisition module 109, a water pump 110, and an electrolysis cell, wherein...
[0039] The three-phase power module 106 is used to provide power to the frequency converter module 102, the 24V power module 103 and the programmable electrolysis module;
[0040] Under the control of PLC module 101, frequency converter module 102 transmits the frequency-converted electrical energy to water pump 110 and controls the speed of water pump 110;
[0041] The 24V power module 103 converts electrical energy into 24V DC power to power the PLC module 101, the human-machine interaction module 108 and the temperature and pressure sensor module 107.
[0042] PLC module 101, as shown Figure 9 As shown, the model of PLC module 101 is EASY320. The A1 interface of PLC module 101 outputs a positive voltage signal in the 485 bus, and the A2 interface of PLC module 101 outputs a negative voltage signal in the 485 bus.
[0043] Depending on the volume of the electrolytic cell, the number of programmable electrolysis modules must be at least one, such as... Figure 1 The image shows one programmable electrolysis module. Each programmable electrolysis module is used to electrolyze wastewater in the electrolysis cell under the control of PLC module 101; for example... Figure 2 As shown, each programmable electrolysis module includes: an electrolytic electrode and a programmable power supply. The electrolytic electrode includes an anode and a cathode, and is disposed in the electrolytic cell to release electrical energy for electrolysis. The programmable power supply is an ANS605D. The F1 interface of the programmable power supply is connected to the A1 interface of the PLC module 101, the F2 interface of the programmable power supply is connected to the A2 interface of the PLC module 101, the F3 interface of the programmable power supply is connected to the three-phase power supply module 106, and the F4 interface of the programmable power supply is grounded. The programmable power supply is connected to the anode and cathode respectively through the + / - interfaces.
[0044] Temperature and pressure sensor module 107 is used to measure the temperature and pressure of wastewater in the electrolysis cell and transmit the data to the PLC module 101; water pump 110 is used to pump the wastewater to be electrolyzed into the electrolysis cell; concentration acquisition module 109 is used to acquire the concentration of the substance to be degraded in the electrolysis cell and transmit the data wirelessly to the human-machine interaction module 108.
[0045] The human-machine interaction module 108 is electrically connected to the PLC module 101.
[0046] The working process of the above-mentioned wastewater treatment system is as follows: PLC module 101 first obtains preset parameters input by the user from the human-machine interface module 108, and then obtains the pressure and temperature of the wastewater in the electrolysis tank through the temperature and pressure sensor module 107. PLC module 101 sends a start signal to inverter module 102, which then starts water pump 110 and controls its speed. Water pump 110 begins pumping the wastewater to be electrolyzed from the wastewater storage area into the electrolysis tank. PLC module 101 controls the programmable electrolysis module in the electrolysis tank to begin electrolysis, converting harmful substances into harmless substances. During the electrolysis process, concentration acquisition module 109 continuously acquires the concentration of the substances to be degraded in the electrolysis tank until degradation is complete.
[0047] Example 2
[0048] A wastewater treatment system, based on Embodiment 1, includes a three-phase power supply module 106 as follows: Figure 3 As shown, the three-phase power module 106 includes: L1 line, L2 line, L3 line, N line and PE line. Among them, L1 line, L2 line and L3 line are all connected to 380V AC power. L1 line is connected to terminal block (26 interface) through air switch U2 and push button switch SW3. L2 line is connected to terminal block (28 interface) through air switch U3 and push button switch SW1. L3 line is connected to terminal block (30 interface) through air switch U1 and push button switch SW2. PE line is connected to terminal block 22 and N line is connected to terminal block 24.
[0049] The L1 line is the main power supply line, used to provide the necessary electrical energy.
[0050] The L2 line is an auxiliary power line to ensure continuous power supply in the event of a main power failure.
[0051] The L3 line is the third phase line in a three-phase power supply.
[0052] The N-line (neutral line) is used to balance current and provide a loop, and is a standard design feature.
[0053] The PE (protective earth) conductor is used to provide a safe ground for the system and prevent electric shock.
[0054] Programmable electrolysis module such as Figure 5 As shown, the F3 interface of the programmable power supply is connected to the L3 line via the air switch U10.
[0055] Programmable power supply
[0056] Example 3
[0057] A wastewater treatment system, based on Embodiment 2, includes a human-computer interaction module 108 as follows: Figure 6As shown, the human-machine interaction module 108 includes a touch screen FE7070E-4G and an antenna T2. The touch screen's C1 interface is connected to the A5 interface of the PLC module 101, the touch screen's C2 interface is connected to the A4 interface of the PLC module 101, the touch screen's C3 interface is grounded, the touch screen's C4 interface is connected to the positive terminal (H4 interface) of the 24V power supply module 103, and the touch screen's C5 interface is connected to the A3 interface of the PLC module 101. The touch screen's C6 and C7 interfaces are connected to the antenna T2. The antenna T2 is used to wirelessly receive data acquired by the concentration acquisition module 109, and the antenna T2 can also transmit data to the host computer.
[0058] The concentration acquisition module 109 only needs to obtain the concentration of the substance to be degraded in the wastewater of the electrolytic cell. In this embodiment, the concentration acquisition module 109 obtains the DPV curve of the wastewater in the electrolytic cell based on the CH340 electrochemical workstation, and then calculates the concentration of the substance to be degraded in the wastewater of the electrolytic cell based on the DPV curve using the corresponding algorithm (Algorithm: Bao, Jinzhe, Li, Hongji, Wang, Xiaoyan, Xu, Sheng, Li, Lan, and Li, Mingji. "Electrochemical Activity of Self-Supporting Nitrogen-Doped Graphene for the Degradation and In-Situ Determination of MethyleneBlue." Process Safety and Environmental Protection 189(2024):920-929. Part 3.3). In this embodiment, the algorithm is built into the electrochemical workstation, and the electrochemical workstation transmits the concentration of the substance to be degraded to the human-computer interaction module 108 via Bluetooth.
[0059] Inverter module 102, for example Figure 7As shown, the inverter module 102 is model MD290 1.5. The B10 interface of inverter module 102 is connected to the A14 interface of PLC module 101; the B1 interface of inverter module 102 is connected to the A1 interface of PLC module 101, and the B2 interface of inverter module 102 is connected to the A2 interface of PLC module 101, used to enable the PLC module to control the inverter module 102. The B3 interface of inverter module 102 is grounded; the B4, B5, and B6 interfaces of inverter module 102 are respectively electrically connected to the L3, L2, and L1 lines of the three-phase power supply module 106 via terminal blocks (29, 27, and 25); the B7, B8, and B9 interfaces of inverter module 102 are respectively electrically connected to the W, V, and U interfaces of the three-phase asynchronous motor of water pump 110 via terminal blocks (5, 7, and 9), controlling the speed (or torque) of water pump 110.
[0060] like Figure 2 As shown, the W, V and U interfaces of the three-phase asynchronous motor of water pump 110 are connected to the 6, 8 and 10 interfaces of the terminal block, respectively. In the terminal block, the 29 interface is electrically connected to the 30 interface, the 27 interface is electrically connected to the 28 interface, the 25 interface is electrically connected to the 26 interface, the 5 interface is electrically connected to the 6 interface, the 7 interface is electrically connected to the 8 interface, and the 9 interface is electrically connected to the 10 interface.
[0061] 24V power module 103 Figure 8 As shown, the model of the 24V power module 103 is EDR-120-24. The H1 interface of the 24V power module 103 is connected to the air switch U12 and then to the L3 line for power supply; the H2 interface of the 24V power module 103 is grounded; the H3 interface of the 24V power module 103 outputs a 24V negative terminal, and the H4 interface of the 24V power module 103 outputs a 24V positive terminal.
[0062] The A0, A6, and A9 interfaces of PLC module 101 are grounded; the A8 and A10 interfaces of PLC module 101 are both connected to the positive terminal of the 24V power supply module 103 for power supply; the A11 interface of PLC module 101 is first connected to button U7 and then grounded to control the power-on of PLC module 101; the A12 interface of PLC module 101 is first connected to button U8 and then grounded to power off PLC module 101; the A13 interface of PLC module 101 is first connected to button U9 and then grounded to control its emergency stop. The function of the A13 interface is to ensure that the entire system can still be stopped in an emergency if PLC module 101 fails.
[0063] The three-phase power module 106 also includes a buzzer T1, which is used to alarm in case of circuit failure. The negative terminal of the buzzer T1 is connected to the N line, and the positive terminal of the buzzer T1 is connected to the path between the push-button switch SW3 and the air switch U2 through the push-button switch SW4. The L1 line and the N line are also connected to the contactor coil L4 through the key switch U4, which is used to control the switching of the entire three-phase power module 106. This is a conventional design. When a circuit failure occurs, the buzzer T1 is triggered to alarm.
[0064] Temperature and pressure sensor module 107 Figure 4 As shown, the temperature and pressure sensor module 107 includes: a temperature sensor DH25-G1 / 4 and a pressure sensor M20*1.59. The E2 interface of the temperature sensor is connected to the A1 interface of the PLC module 101, the E1 interface of the temperature sensor is connected to the A2 interface of the PLC module 101, the E3 interface of the temperature sensor is grounded, and the E4 interface of the temperature sensor is connected to the positive terminal of the 24V power supply module 103.
[0065] The pressure sensor's D2 interface is connected to the PLC module 101's A1 interface, the pressure sensor's D1 interface is connected to the PLC module 101's A2 interface, the pressure sensor's D3 interface is grounded, and the pressure sensor's D4 interface is connected to the positive terminal of the 24V power supply module 103.
[0066] The wastewater treatment system of this invention can also be remotely monitored and controlled by a host computer using Internet of Things (IoT) technology, allowing for real-time understanding of the equipment's operating status and improving management efficiency and convenience.
[0067] The present invention has been described above by way of example. It should be noted that, without departing from the core of the present invention, any simple modifications, alterations or other equivalent substitutions that can be made by those skilled in the art without creative effort fall within the protection scope of the present invention.
Claims
1. A sewage treatment system characterised in that, The application relates to a sewage electrolysis system, which comprises the following modules: a PLC module, a frequency converter module, a program-controlled electrolysis module, a three-phase power supply module, a temperature and pressure sensor module, a man-machine interaction module, a concentration acquisition module, a water pump and an electrolytic cell, wherein the three-phase power supply module is used for providing power for the frequency converter module and the program-controlled electrolysis module; the frequency converter module delivers frequency-converted power to the water pump and controls the rotating speed of the water pump under the control of the PLC module; the A1 interface of the PLC module outputs a positive voltage signal in a 485 bus, and the A2 interface of the PLC module outputs a negative voltage signal in the 485 bus; the number of the program-controlled electrolysis modules is at least one, each program-controlled electrolysis module is used for electrolyzing sewage in an electrolytic cell under the control of the PLC module, each program-controlled electrolysis module comprises an electrolytic electrode and a program-controlled power supply, the electrolytic electrode comprises an anode and a cathode, and the electrolytic electrode is arranged in the electrolytic cell; the F1 interface of the program-controlled power supply is connected with the A1 interface of the PLC module, the F2 interface of the program-controlled power supply is connected with the A2 interface of the PLC module, the F3 interface of the program-controlled power supply is connected with the three-phase power supply module, the F4 interface of the program-controlled power supply is grounded, and the program-controlled power supply is connected with the anode and the cathode through + / - interfaces respectively; the temperature and pressure sensor module is used for measuring the temperature and pressure of sewage in the electrolytic cell and transmitting the temperature and pressure to the PLC module; the water pump is used for pumping sewage to be electrolyzed into the electrolytic cell, and the concentration acquisition module is used for acquiring the concentration of a substance to be degraded in the sewage in the electrolytic cell and wirelessly transmitting the concentration to the man-machine interaction module; the man-machine interaction module is electrically connected with the PLC module.
2. The sewage treatment system of claim 1, wherein, The application further comprises a 24V power supply module, the three-phase power supply module is used for providing power for the 24V power supply module, and the 24V power supply module converts power into 24V direct current to supply power to the PLC module, the man-machine interaction module and the temperature and pressure sensor module.
3. The sewage treatment system of claim 2, wherein, The temperature and pressure sensor module comprises a temperature sensor DH25-G1 / 4 and a pressure sensor M20*1.59, the E2 interface of the temperature sensor is connected with the A1 interface of the PLC module, the E1 interface of the temperature sensor is connected with the A2 interface of the PLC module, the E3 interface of the temperature sensor is grounded, and the E4 interface of the temperature sensor is connected with the positive electrode of the 24V power supply module; the D2 interface of the pressure sensor is connected with the A1 interface of the PLC module, the D1 interface of the pressure sensor is connected with the A2 interface of the PLC module, the D3 interface of the pressure sensor is grounded, and the D4 interface of the pressure sensor is connected with the positive electrode of the 24V power supply module.
4. The sewage treatment system of claim 3, wherein, The three-phase power supply module comprises an L1 line, an L2 line, an L3 line, an N line and a PE line, the L1 line, the L2 line and the L3 line are all externally connected with 380V alternating current; the L1 line is a main power supply line, the L2 line is an auxiliary power supply line, the L3 line is a third phase line in the three-phase power supply, the N line is a neutral line, and the PE line is a ground line.
5. The sewage treatment system of claim 4, wherein, The F3 interface of the program-controlled power supply is connected with the L3 line through an air switch U10.
6. The sewage treatment system of claim 5, wherein, The human-computer interaction module comprises a touch screen FE7070E-4G and an antenna T2, wherein the C1 interface of the touch screen is connected with the A5 interface of the PLC module, the C2 interface of the touch screen is connected with the A4 interface of the PLC module, the C3 interface of the touch screen is grounded, the C4 interface of the touch screen is connected with the positive pole of the 24V power module, the C5 interface of the touch screen is connected with the A3 interface of the PLC module, and the C6 and C7 interfaces of the touch screen are connected with the antenna T2; the antenna T2 is used for wirelessly receiving data acquired by the concentration acquisition module.
7. The sewage treatment system of claim 5, wherein, The frequency converter module is of the model MD290 1.5, the B10 interface of the frequency converter module is connected with the A14 interface of the PLC module, the B1 interface of the frequency converter module is connected with the A1 interface of the PLC module, the B2 interface of the frequency converter module is connected with the A2 interface of the PLC module, and the B3 interface of the frequency converter module is grounded; the B4, B5 and B6 interfaces of the frequency converter module are sequentially connected with the L3, L2 and L1 lines of the three-phase power module, respectively, the B7, B8 and B9 interfaces of the frequency converter module are sequentially connected with the W, V and U interfaces of the water pump three-phase asynchronous motor, respectively.
8. The sewage treatment system of claim 7, wherein, The 24V power module is of the model EDR-120-24, the H1 interface of the 24V power module is connected with the L3 line after the air switch U12, and is used for power supply; the H2 interface of the 24V power module is grounded; the H3 interface of the 24V power module outputs the negative pole of 24V, and the H4 interface of the 24V power module outputs the positive pole of 24V.
9. The sewage treatment system of claim 8, wherein, The A0, A6 and A9 interfaces of the PLC module are grounded; the A8 and A10 interfaces of the PLC module are both connected with the positive pole of the 24V power module, the A11 interface of the PLC module is connected with the button U7 and then grounded, and is used for controlling the start of the PLC module, the A12 interface of the PLC module is connected with the button U8 and then grounded, and is used for realizing the shutdown of the PLC module, and the A13 interface of the PLC module is connected with the button U9 and then grounded.
10. The sewage treatment system of claim 9, wherein, The three-phase power module further comprises a buzzer T1, the negative pole of the buzzer T1 is connected with the N line, the positive pole of the buzzer T1 is connected with the passage between the button switch SW3 and the air switch U2 through the button switch SW4, and the L1 line and the N line are further connected with the contactor coil L4 through the key switch U4.