Control system of electric flocculation air floatation sewage treatment equipment

Abstract

The invention provides a control system of electric flocculation air floatation sewage treatment equipment, which comprises a constant-voltage constant-current source, a pole-changing H-bridge circuit, an output current sampling circuit and a sewage treatment monitoring module, and is characterized in that the constant-voltage constant-current source is connected with a sewage treatment electrode through the pole-changing H-bridge circuit and supplies power to the sewage treatment electrode; the output current sampling circuit is connected with the constant-voltage and constant-current source and is used for detecting a current signal; the constant-voltage and constant-current source, the pole-changing H-bridge circuit and the output current sampling circuit are all connected with the sewage treatment monitoring module, and the sewage treatment monitoring module controls the output voltage and current value of the constant-voltage and constant-current source according to a power supply current signal detected by the output current sampling circuit and controls the on or off and pole changing of the pole-changing H-bridge circuit. Therefore, the power supply time and the power supply direction of the constant-voltage and constant-current source are controlled. The control system can adjust the sewage treatment voltage, current, power supply direction and power supply time, and the sewage treatment quality and efficiency are high.

Description

Technical Field

[0001] The invention relates to the technical field of electric flocculation and air flotation, and in particular to a control system of electric flocculation and air flotation sewage treatment equipment. Background Art

[0002] The electro-flocculation flotation technology is to use aluminum or iron to generate highly active polymorphic polyaluminum or poly-iron flocculants in situ at the anode under the action of external voltage. The polyaluminum or poly-iron flocculants can flocculate colloidal pollutants. At the same time, a large number of tiny hydrogen bubbles are precipitated at the cathode under the action of voltage. The hydrogen bubbles can float the flocs during the floating process. The electro-flocculation, electro-flotation and electro-oxidation processes occur simultaneously in the reactor. The soluble colloids and suspended pollutants in the water can be effectively transformed and removed under the action of coagulation, flotation and oxidation. The electro-flocculation flotation technology can effectively remove suspended matter, organic matter, heavy metals and other pollutants in the water, and is suitable for sewage treatment, wastewater treatment and other fields. The electro-flocculation flotation technology has the advantages of high treatment efficiency, no need to add chemical agents, simple equipment, and easy to realize automatic control.

[0003] The control of the existing electro-flocculation flotation sewage treatment equipment adopts a fixed voltage, a fixed current and a contactor to energize the electrode, and the pole is changed at a fixed time to realize the electrochemical reaction with the sewage to achieve the purpose of sewage treatment. The existing technology has the problems of insufficient electrode use, incomplete sewage treatment, large and bulky treatment control equipment, and no protection when working abnormally. Insufficient electrode use: Because the current and voltage of the electrode can only be fixed values ​​during the treatment of the existing technology, and the time of pole change is not completely consistent, the electrode is limited to participate in the electrochemical reaction during sewage treatment, and then the electrode is not used sufficiently, resulting in waste, shortened electrode use time, and increased electrode maintenance costs. Incomplete sewage treatment: Because the fixed process of the existing technology cannot be adjusted, the sewage is not completely treated, and there may be a problem of secondary treatment. The treatment control equipment is large and bulky: The actuators such as contactors used in the existing technology are large in size and complex in control, which causes difficulties in transportation and maintenance and increases maintenance costs. No protection when working abnormally: The existing technology cannot shut down the equipment in time when the equipment is abnormal during the sewage treatment process, which may cause safety hazards to personnel and equipment. These problems and shortcomings are to be solved by the technical solution of the present invention. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a control system for an electro-flocculation flotation sewage treatment device, which can adjust the sewage treatment voltage, current, power supply direction and power supply time, has high sewage treatment quality and efficiency, and can ensure full utilization of electrodes.

[0005] In order to solve the above technical problems, the technical solution of the present invention is:

[0006] A control system for an electro-flocculation flotation sewage treatment device, the electro-flocculation flotation sewage treatment device at least comprising a sewage treatment electrode, the control system comprising a constant voltage and constant current source, a pole-changing H-bridge circuit, an output current sampling circuit and a sewage treatment monitoring module, wherein the constant voltage and constant current source is connected to the sewage treatment electrode via the pole-changing H-bridge circuit, the constant voltage and constant current source supplies power to the sewage treatment electrode, the output current sampling circuit is connected to the constant voltage and constant current source, and detects the power supply current signal of the constant voltage and constant current source; the constant voltage and constant current source, the pole-changing H-bridge circuit, and the output current sampling circuit are all connected to the sewage treatment monitoring module, the sewage treatment monitoring module controls the output voltage and current value of the constant voltage and constant current source according to the power supply current signal detected by the output current sampling circuit, and controls the opening or closing and pole-changing of the pole-changing H-bridge circuit, thereby controlling the power supply time and power supply direction of the constant voltage and constant current source via the pole-changing H-bridge circuit.

[0007] The signal output end of the sewage treatment monitoring module is connected to a constant voltage and constant current regulating circuit, which is connected to a constant voltage and constant current source, and the output voltage and current value of the constant voltage and constant current source are controlled by the constant voltage and constant current regulating circuit;

[0008] The constant voltage and constant current regulation circuit includes a digital isolator D12, a digital isolator D14, an A / D converter D13 and an A / D converter D15. The digital isolator D12 and the digital isolator D14 are connected to the signal output end of the sewage treatment monitoring module and are respectively connected to the A / D converter D13 and the A / D converter D15. The sewage treatment monitoring module controls the A / D converter D13 and the A / D converter D15 through the optical coupling isolation of the digital isolator D12 and the digital isolator D14 to generate voltage and current regulation signals, thereby controlling the output voltage and current value of the constant voltage and constant current source.

[0009] The pole-changing H-bridge circuit includes four groups of drive circuits and four groups of switch circuits, the four groups of drive circuits are respectively connected to the four groups of switch circuits, and the four groups of drive circuits are all connected to the output end of the sewage treatment monitoring module;

[0010] The four groups of switch circuits are switch circuit one, switch circuit two, switch circuit three and switch circuit four. The input ends of switch circuit one and switch circuit three are connected to the first output end of the constant voltage and constant current source, the output ends of switch circuit one and switch circuit three are connected to the input ends of switch circuit two and switch circuit four respectively, and the output ends of switch circuit one and switch circuit three are connected to the cathode and anode of the sewage treatment electrode respectively, and the output ends of switch circuit two and switch circuit four are connected to the second output end of the constant voltage and constant current source; the sewage treatment monitoring module controls the opening or closing and pole changing of the four groups of switch circuits through four groups of drive circuits.

[0011] The driving circuits all include a first MOS tube and a switching power supply, the gate of the first MOS tube is connected to the output end of the sewage treatment monitoring module, the source of the first MOS tube is grounded, and the drain of the first MOS tube is connected to the positive and negative electrodes of the switching power supply input end;

[0012] The switch circuits all include a first resistor, a second resistor and a second MOS tube. The positive and negative electrodes of the four groups of switch power supply output ends are respectively connected to the gate and source electrodes of the four groups of second MOS tubes, and the first resistor is connected in series between the positive electrode of the switch power supply output end and the gate electrode of the second MOS tube, and the two ends of the second resistor are respectively connected to the gate electrode and the source electrode of the second MOS tube; the drain electrodes of the second MOS tubes of the switch circuit one and the switch circuit three are connected to the first output end of the constant voltage and constant current source, the source electrodes of the second MOS tubes of the switch circuit one and the switch circuit three are respectively connected to the drain electrodes of the second MOS tubes of the switch circuit two and the switch circuit four, and the source electrodes of the second MOS tubes of the switch circuit one and the switch circuit three are respectively connected to the cathode and the anode of the sewage treatment electrode, and the source electrodes of the second MOS tubes of the switch circuit two and the switch circuit four are both connected to the second output end of the constant voltage and constant current source.

[0013] The output current sampling circuit includes a Hall current sensor and a third resistor, pins 4 and 5 of the Hall current sensor are connected to the output end of the constant voltage and constant current source, pin 3 of the Hall current sensor is connected to the first end of the third resistor, and the second end of the third resistor is connected to the signal input end of the sewage treatment monitoring module, and the current signal detected by the Hall current sensor is transmitted to the sewage treatment monitoring module through the third resistor.

[0014] The sewage treatment monitoring module adopts a 32-bit MCU microcontroller, model STM32F105RCT6.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) The control system of the electro-flocculation flotation sewage treatment equipment provided by the present invention includes a constant voltage and constant current source, a pole-changing H-bridge circuit, an output current sampling circuit and a sewage treatment monitoring module. The sewage treatment electrode is powered by the constant voltage and constant current source. The output current sampling circuit detects the power supply current signal of the constant voltage and constant current source in real time. The sewage treatment monitoring module controls the output voltage and current value of the constant voltage and constant current source according to the power supply current signal, and controls the power supply time and power supply direction of the constant voltage and constant current source through the pole-changing H-bridge circuit, thereby realizing automatic control of the electro-flocculation flotation sewage treatment equipment and optimizing the sewage treatment process, ensuring the improvement of sewage treatment quality and efficiency.

[0016] (2) The control system of the electric flocculation flotation sewage treatment equipment provided by the present invention can adjust the sewage treatment voltage, current, power supply direction and power supply time according to the sewage treatment effect, so as to ensure the quality and efficiency of sewage treatment, make full use of the electrodes, save the cost of sewage treatment electrodes, and solve the problems of insufficient electrode use and incomplete sewage treatment caused by fixed voltage and fixed current in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A connection block diagram of a control system of the electric flocculation flotation sewage treatment equipment provided by the present invention;

[0018] Figure 2 This is a circuit schematic diagram of the sewage treatment monitoring module in the present invention;

[0019] Figure 3 It is a circuit principle diagram of the constant voltage and constant current regulation circuit in the present invention;

[0020] Figure 4 It is a circuit schematic diagram of the pole-changing H-bridge circuit and the output current sampling circuit in the present invention;

[0021] Figure 5 It is a circuit principle diagram of the driving circuit of the pole-changing H-bridge circuit in the present invention. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] The present invention provides a control system for an electro-flocculation flotation sewage treatment device, wherein the electro-flocculation flotation sewage treatment device at least comprises a sewage treatment electrode, and the control system comprises a constant voltage and constant current source, a pole-changing H-bridge circuit, an output current sampling circuit, and a sewage treatment monitoring module, wherein the constant voltage and constant current source is connected to the sewage treatment electrode through the pole-changing H-bridge circuit, the constant voltage and constant current source supplies power to the sewage treatment electrode, the output current sampling circuit is connected to the constant voltage and constant current source, and detects a power supply current signal of the constant voltage and constant current source; the constant voltage and constant current source, the pole-changing H-bridge circuit, and the output current sampling circuit are all connected to the sewage treatment monitoring module, the output current sampling circuit outputs the detected power supply current signal to the sewage treatment monitoring module, and the sewage treatment monitoring module controls the output voltage and current value of the constant voltage and constant current source according to the power supply current signal, and controls the opening or closing and pole-changing of the pole-changing H-bridge circuit, thereby controlling the power supply time and power supply direction of the constant voltage and constant current source through the pole-changing H-bridge circuit, such as Figure 1 shown.

[0024] See also Figure 2The sewage treatment monitoring module U1 adopts a 32-bit MCU microcontroller, model STM32F105RCT6. The output current sampling circuit is connected to the signal input terminal (pins 19 and 20) on the sewage treatment monitoring module U1, and the constant voltage and constant current source and the pole-changing H-bridge circuit are connected to the signal output terminal (pins 47-50 and pins 21-24) on the sewage treatment monitoring module U1.

[0025] See also Figure 3 The signal output end of the sewage treatment monitoring module U1 is connected to the constant voltage and constant current regulation circuit, and the constant voltage and constant current regulation circuit is connected to the constant voltage and constant current source, and the output voltage and current value of the constant voltage and constant current source are controlled by the constant voltage and constant current regulation circuit. The constant voltage and constant current regulation circuit includes a digital isolator D12, a digital isolator D14, an A / D converter D13 and an A / D converter D15, and the digital isolator D12 and the digital isolator D14 are connected to the signal output end (pins 47, 48, 49, and 50) of the sewage treatment monitoring module U1 and are respectively connected to the A / D converter D13 and the A / D converter D15. The sewage treatment monitoring module U1 controls the A / D converter D13 and the A / D converter D15 through the optical coupling isolation of the digital isolator D12 and the digital isolator D14 to generate voltage and current regulation signals, namely, signals XL1 and XL2, thereby controlling the output voltage and current value of the constant voltage and constant current source. Specifically, the model of the digital isolator D12 and the digital isolator D14 is π131U31.

[0026] See also Figure 4 and Figure 5 The pole-changing H-bridge circuit includes four sets of drive circuits and four sets of switch circuits. The four sets of drive circuits are all connected to the output end (pins 21-24) of the sewage treatment monitoring module U1. Specifically, the four sets of drive circuits each include a first MOS tube (V26, V27, V28, V29) and a switch power supply (M7, M8, M9, M10), see Figure 5 The gate of the first MOS tube (V26, V27, V28, V29) is connected to the output end of the sewage treatment monitoring module U1 (pins 21-24), the source of the first MOS tube (V26, V27, V28, V29) is grounded, and the drain of the first MOS tube (V26, V27, V28, V29) is connected to the positive and negative electrodes of the input end of the switching power supply (M7, M8, M9, M10); the positive and negative electrodes of the output ends of the switching power supplies (M7, M8, M9, M10) of the four groups of driving circuits are respectively connected to the four groups of switching circuits, and are respectively used to drive the four groups of switching circuits. Further, the model of the first MOS tube is NCE2308X, and the model of the switching power supply is B1212S-1WR3.

[0027] See also Figure 4The four groups of switch circuits are switch circuit one, switch circuit two, switch circuit three and switch circuit four. The input ends of switch circuit one and switch circuit three are connected to the first output end of the constant voltage and constant current source, the output ends of switch circuit one and switch circuit three are connected to the input ends of switch circuit two and switch circuit four respectively, and the output ends of switch circuit one and switch circuit three are connected to the cathode and anode of the sewage treatment electrode respectively, and the output ends of switch circuit two and switch circuit four are connected to the second output end of the constant voltage and constant current source; the sewage treatment monitoring module controls the opening or closing and pole changing of the four groups of switch circuits through four groups of drive circuits. Specifically, the switch circuits include a first resistor (R91, R92, R103, R104), a second resistor (R93, R94, R109, R110) and a second MOS tube (V1, V2, V3, V4), the positive and negative electrodes of the output ends of the four groups of switch power supplies (M7, M8, M9, M10) are respectively connected to the gate and source of the four groups of second MOS tubes (V1, V2, V3, V4), and the first resistor (R91, R92, R103, R104) is connected in series between the positive electrode of the output end of the switch power supply (M7, M8, M9, M10) and the gate of the second MOS tube (V1, V2, V3, V4), and the second resistor (R93, R94, R109 , R110) are respectively connected to the gate and source of the second MOS tube (V1, V2, V3, V4); the drain of the second MOS tube (V1, V3) of the switch circuit one and the switch circuit three is connected to the first output end of the constant voltage and constant current source, the source of the second MOS tube (V1, V3) of the switch circuit one and the switch circuit three is respectively connected to the drain of the second MOS tube (V2, V4) of the switch circuit two and the switch circuit four, and the source of the second MOS tube (V1, V3) of the switch circuit one and the switch circuit three is respectively connected to the cathode and anode of the sewage treatment electrode, and the source of the second MOS tube (V2, V4) of the switch circuit two and the switch circuit four is connected to the second output end of the constant voltage and constant current source. Specifically, the model of the second MOS tube is IPT015N10N5. The sewage treatment monitoring module U1 controls the opening or closing and pole change of the four groups of switch circuits through four groups of drive circuits.

[0028] See also Figure 4The output current sampling circuit includes a Hall current sensor M12 and a third resistor R32. Pins 4 and 5 of the Hall current sensor M12 are connected to the output end of the constant voltage and constant current source. Pin 3 of the Hall current sensor M12 is connected to the first end of the third resistor R32. The second end of the third resistor R32 is connected to the signal input end (pins 19 and 20) of the sewage treatment monitoring module U1. The current signal detected by the Hall current sensor M12 is transmitted to the sewage treatment monitoring module U1 through the third resistor R32. The sewage treatment monitoring module U1 adjusts and controls the output voltage and current value of the constant voltage and constant current source, the opening or closing of the pole-changing H-bridge circuit, and the pole-changing according to the current signal, thereby adjusting and controlling the entire sewage treatment process. Specifically, the model of the Hall current sensor is ACS758KCB-150B-PFF-T.

[0029] The present invention provides a control system for an electro-flocculation flotation sewage treatment device. The working principle is as follows: (1) Start the main circuit working process: Figure 4 According to the set program, the sewage treatment monitoring module first gives a certain voltage and current value to the constant voltage and constant current source, and turns on the two opposite second MOS tubes in the pole-changing H-bridge circuit through the driving circuit (for example, turn on V1 and V4). At this time, the current direction is the positive flow of the constant voltage and constant current source through the output current sampling circuit, then to V1, then into the sewage treatment electrode, then into V4, and finally back to the negative pole of the constant voltage and constant current source. At this time, the sewage treatment electrode is powered, and one side of the electrode and the sewage produce an electrochemical reaction to treat the sewage. This process is first assumed by default that the sewage treatment electrode is powered positive and one side of the sewage treatment electrode is working.

[0030] After the set working time of the two relative second MOS tubes (V1 and V4) is completed, they automatically switch to another set of relative second MOS tubes to work (for example, switch to V2 and V3). At this time, the current direction is the positive flow of the constant voltage and constant current source through the output current sampling circuit, then to V3, then into the sewage treatment electrode, then into V2, and finally back to the negative pole of the constant voltage and constant current source. At this time, the sewage treatment electrode is powered, and the other side of the electrode and the sewage produce an electrochemical reaction to treat the sewage. This process defaults to the sewage treatment electrode working with negative power supply (that is, the positive and negative power supply of the sewage treatment electrode is switched), and the other side of the sewage treatment electrode is working. It keeps working in a cycle. The above is the working process of the main circuit.

[0031] (2) Start the control loop working process: First, after the equipment is turned on, the sewage treatment monitoring module sets an initial voltage and current value for the constant voltage and constant current source according to the setting program, so that the constant voltage and constant current source can normally supply power to the subsequent circuits such as the pole-changing H-bridge circuit. Specifically, there are pins 47, 48, 49, and 50 of U1 (see Figure 2) D13 and D15 of the constant voltage and constant current source regulation circuit are controlled by D12 and D14 optical coupler isolation (see Figure 4 ) generates voltage and current regulation signals to control the output voltage and current of the constant voltage and current source (i.e., signals XL1 and XL2). Figure 3 , Figure 4 Then, according to the sewage treatment monitoring program, the pole-changing H-bridge circuit is turned on (the main circuit starts to work at this time, see the first main circuit working process for details). The specific working process of this control circuit is: U1's 21-24 pins (see Figure 2 ) sends a drive signal, which in turn controls V26, V27, V28, and V29 of the drive circuit in the pole-changing H-bridge circuit to control M7, M8, M9, and M10 (see Figure 5 ), and finally control the opening and closing of V1, V2, V3, and V4 (see Figure 4 ). When V1, V2, V3, and V4 are working, V1 and V4 work as a group at the same time, and V2 and V3 work as a group at the same time. The sewage treatment monitoring controls the on-off switching of the two groups of MOS tubes to control the work of both sides of the sewage treatment electrode. For details, see the first main circuit working process.

[0032] (3) Process adjustment and protection of sewage treatment: During the operation of the electro-flocculation flotation sewage treatment equipment, the sewage treatment monitoring module will automatically adjust the working time of both sides of the sewage treatment electrodes according to the size of the current sampling signal and the cumulative working time of the sewage treatment electrodes to ensure full utilization of the electrodes. At the same time, it will determine whether the equipment is abnormal based on the size of the current sampling signal, and provide timely protection to ensure the safety of equipment and personnel. The degree of sewage treatment can also be determined based on the current signal to ensure the quality of sewage treatment (when sewage is treated to a certain standard or degree, its impedance will be larger, and thus the current will be smaller). The specific process is as follows: the output current sampling circuit M12 sends the detected current signal to the 19 and 20 pins of the sewage treatment monitoring module through the resistor R32 (see Figure 2 , Figure 4 ) for treatment, and then adjust and control the entire sewage treatment process.

Claims

1. A control system for an electro-flocculation flotation sewage treatment device, the electro-flocculation flotation sewage treatment device comprising at least sewage treatment electrodes, Features: The control system includes a constant voltage and constant current source, a pole-changing H-bridge circuit, an output current sampling circuit and a sewage treatment monitoring module, wherein the constant voltage and constant current source is connected to the sewage treatment electrode through the pole-changing H-bridge circuit, the constant voltage and constant current source supplies power to the sewage treatment electrode, the output current sampling circuit is connected to the constant voltage and constant current source, and detects the power supply current signal of the constant voltage and constant current source; the constant voltage and constant current source, the pole-changing H-bridge circuit, and the output current sampling circuit are all connected to the sewage treatment monitoring module, and the sewage treatment monitoring module controls the output voltage and current value of the constant voltage and constant current source according to the power supply current signal detected by the output current sampling circuit, and controls the opening or closing and pole changing of the pole-changing H-bridge circuit, thereby controlling the power supply time and power supply direction of the constant voltage and constant current source through the pole-changing H-bridge circuit.

2. The control system of the electro-flocculation flotation sewage treatment equipment according to claim 1, Features: The signal output end of the sewage treatment monitoring module is connected to a constant voltage and constant current regulating circuit, which is connected to a constant voltage and constant current source, and the output voltage and current value of the constant voltage and constant current source are controlled by the constant voltage and constant current regulating circuit; The constant voltage and constant current regulation circuit includes a digital isolator D12, a digital isolator D14, an A / D converter D13 and an A / D converter D15. The digital isolator D12 and the digital isolator D14 are connected to the signal output end of the sewage treatment monitoring module and are respectively connected to the A / D converter D13 and the A / D converter D15. The sewage treatment monitoring module controls the A / D converter D13 and the A / D converter D15 through the optical coupling isolation of the digital isolator D12 and the digital isolator D14 to generate voltage and current regulation signals, thereby controlling the output voltage and current value of the constant voltage and constant current source.

3. The control system of the electro-flocculation flotation sewage treatment equipment according to claim 1, Features: The pole-changing H-bridge circuit includes four groups of drive circuits and four groups of switch circuits, the four groups of drive circuits are respectively connected to the four groups of switch circuits, and the four groups of drive circuits are all connected to the output end of the sewage treatment monitoring module; The four groups of switch circuits are switch circuit one, switch circuit two, switch circuit three and switch circuit four. The input ends of switch circuit one and switch circuit three are connected to the first output end of the constant voltage and constant current source, the output ends of switch circuit one and switch circuit three are connected to the input ends of switch circuit two and switch circuit four respectively, and the output ends of switch circuit one and switch circuit three are connected to the cathode and anode of the sewage treatment electrode respectively, and the output ends of switch circuit two and switch circuit four are connected to the second output end of the constant voltage and constant current source; the sewage treatment monitoring module controls the opening or closing and pole changing of the four groups of switch circuits through four groups of drive circuits.

4. The control system of the electro-flocculation flotation sewage treatment equipment according to claim 3, Features: The driving circuits all include a first MOS tube and a switching power supply, the gate of the first MOS tube is connected to the output end of the sewage treatment monitoring module, the source of the first MOS tube is grounded, and the drain of the first MOS tube is connected to the positive and negative electrodes of the switching power supply input end; The switch circuits all include a first resistor, a second resistor and a second MOS tube. The positive and negative electrodes of the four groups of switch power supply output ends are respectively connected to the gate and source electrodes of the four groups of second MOS tubes, and the first resistor is connected in series between the positive electrode of the switch power supply output end and the gate electrode of the second MOS tube, and the two ends of the second resistor are respectively connected to the gate electrode and the source electrode of the second MOS tube; the drain electrodes of the second MOS tubes of the switch circuit one and the switch circuit three are connected to the first output end of the constant voltage and constant current source, the source electrodes of the second MOS tubes of the switch circuit one and the switch circuit three are respectively connected to the drain electrodes of the second MOS tubes of the switch circuit two and the switch circuit four, and the source electrodes of the second MOS tubes of the switch circuit one and the switch circuit three are respectively connected to the cathode and the anode of the sewage treatment electrode, and the source electrodes of the second MOS tubes of the switch circuit two and the switch circuit four are both connected to the second output end of the constant voltage and constant current source.

5. The control system of the electro-flocculation flotation sewage treatment equipment according to claim 1, Features: The output current sampling circuit includes a Hall current sensor and a third resistor, pins 4 and 5 of the Hall current sensor are connected to the output end of the constant voltage and constant current source, pin 3 of the Hall current sensor is connected to the first end of the third resistor, and the second end of the third resistor is connected to the signal input end of the sewage treatment monitoring module, and the current signal detected by the Hall current sensor is transmitted to the sewage treatment monitoring module through the third resistor.

6. The control system of the electro-flocculation flotation sewage treatment equipment according to claim 1, Features: The sewage treatment monitoring module adopts a 32-bit MCU microcontroller, model STM32F105RCT6.

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