Microorganism feeding device for improving water quality

Abstract

The invention discloses a microorganism feeding device for water quality improvement, belongs to the field of water environment treatment equipment, and solves the problems of non-uniform mixing, insufficient dissolved oxygen and low diffusion efficiency when a microbial agent is fed. The device comprises a bacterial liquid storage tank, an electric stirrer, a supply pump, a Venturi tube, a microporous aeration head, a mixed liquid feeding pipe and a control unit, a sealing cover is arranged at the top of the bacteria liquid storage tank; the electric stirrer drives the stirring shaft and the paddle to stir; the supply pump conveys the bacterial liquid to the Venturi tube, and the throat tube section of the Venturi tube is provided with a tube wall opening and is connected into the microporous aeration head with the check valve to realize efficient oxygen dissolution; the mixed liquid is released by the feeding pipe through the diffusion section; the control unit coordinates stirring and supplying actions. The device is suitable for bioremediation and water purification of closed or slow-flow water bodies such as lakes and ponds.

Description

Technical Field

[0001] This invention relates to the field of water environment treatment equipment. More specifically, this invention relates to a microbial dispensing device for water quality improvement. Background Technology

[0002] In the process of water quality improvement using microbial agents in enclosed or slow-flowing water bodies, existing technologies typically employ direct spraying or simple pumping methods to deliver the bacterial solution. These methods easily lead to excessive concentration of microorganisms in localized areas, while other areas suffer from insufficient distribution, resulting in uneven diffusion of the agent throughout the water and affecting the overall treatment effect. This is because the bacterial solution relies primarily on natural diffusion after entering the water body, lacking a forced mixing and transport mechanism. Especially in large or deep water bodies, natural convection is limited, making it difficult for the agent to quickly distribute to the target area.

[0003] On the other hand, the survival and metabolic efficiency of microorganisms, especially aerobic bacteria, in water bodies are highly dependent on dissolved oxygen levels. Existing dosing devices often lack effective aeration and oxygenation functions, resulting in a significant decrease in the activity of microbial agents after they enter low-oxygen or anoxic water bodies, thus limiting their ability to degrade pollutants. Although some devices attempt to add aeration components, they mostly employ independent aeration and step-by-step dosing methods, failing to achieve sufficient pre-mixing of gas and bacterial solution, resulting in low oxygenation efficiency and making it difficult to ensure that microorganisms are in a high-dissolved-oxygen environment immediately upon dosing.

[0004] Furthermore, most existing devices lack dedicated stirring and conveying structures for the physical properties of the bacterial solution. Microbial agents often contain solid or viscous components, which are prone to sedimentation or flocculation after prolonged standing, resulting in unstable pumped concentrations or even pipe blockage. If stirring is insufficient, the agent will be unevenly distributed in the storage tank, causing the actual dosage concentration to deviate from the set value, affecting the dosage accuracy and treatment effect. On the other hand, improperly designed mechanical stirring devices may suffer from excessive shear force that damages bacterial activity, or excessive energy consumption that makes continuous operation difficult.

[0005] In practical applications, attempts have been made to improve the aforementioned problems by adding agitators, aerators, and delivery pumps. However, these were mostly simple stackings of equipment without achieving functional coupling. This not only resulted in a complex system structure and increased energy consumption but also made coordinated operation difficult due to the independent control of each unit. For example, mismatched agitation and pumping rhythms or poor timing of gas-liquid mixing led to unsatisfactory overall dosing efficiency. How to achieve uniform mixing of microbial agents, efficient dissolved oxygenation, and controllable dosing without significantly increasing energy consumption and complexity remains a challenging problem that has not yet been properly solved in current technology. Summary of the Invention

[0006] One object of the present invention is to solve at least the above-mentioned problems and to provide a microbial dispensing device for water quality improvement.

[0007] To achieve these objectives and other advantages according to the present invention, a microbial dispensing device for water quality improvement is provided, comprising: A bacterial liquid storage tank has an open top and a discharge port at the bottom, and the open part of the bacterial liquid storage tank is equipped with a sealing cover; An electric stirrer is vertically mounted on the sealing cover. The stirring shaft of the electric stirrer extends to the bottom of the bacterial liquid storage tank, and at least two layers of blades are fixed on the stirring shaft. The supply pump has its inlet connected to the discharge port of the bacterial liquid storage tank via a first pipeline; The Venturi tube has its inlet section connected to the outlet of the supply pump via a second pipe. The ratio of the diameter of the throat section of the Venturi tube to the diameter of its inlet section is 1:2 to 1:3. An opening is provided in the wall of the throat section of the Venturi tube. A microporous aeration head is connected to the opening in the pipe wall through a third pipe, and a check valve is provided on the third pipe; The mixing liquid delivery pipe is connected to the outlet of the venturi tube diffuser section; The control unit is electrically connected to the electric mixer and the supply pump and controls the start and stop of the electric mixer and the supply pump.

[0008] Preferably, it also includes a float, on which the bacterial liquid storage tank, electric stirrer, supply pump, venturi tube and control unit are all fixedly installed; The floating body is equipped with a solar panel, which is electrically connected to the control unit to power the microbial dispensing device for water quality improvement. The buoy is also equipped with a GPS positioning module, which is electrically connected to the control unit.

[0009] Preferably, it also includes a turbidity sensor, a flow sensor, and a proportional control valve; The turbidity sensor is located on the side of the inlet of the mixed liquid delivery pipe away from the Venturi tube, and is used to monitor the turbidity value of the water at the delivery point. The flow sensor is installed on the second pipe to monitor the real-time flow value of the microbial agent mixture; The proportional regulating valve is installed on the second pipeline and is located on the side of the flow sensor closer to the supply pump; The control unit is electrically connected to the turbidity sensor, the flow sensor, and the proportional control valve. The control unit stores a pre-defined relationship between water turbidity values ​​and the total set value of microbial agent dosage; the control unit executes the following control steps: Read the current turbidity value of the water body monitored by the turbidity sensor, and calculate the required total amount of microbial agent to be added based on the corresponding relationship; Based on the total amount of microbial agent added and the known fixed concentration of the mixture in the agent storage tank, the flow rate setting of the microbial agent mixture is calculated. Read the real-time flow value monitored by the flow sensor; The real-time flow rate is compared with the calculated flow rate setpoint, and a control signal is sent to the proportional control valve to dynamically adjust its opening so that the real-time flow rate approaches the flow rate setpoint.

[0010] Preferably, the control unit is also electrically connected to a current sensor and a status indicator light; The current sensor is used to monitor the real-time operating current value of the supply pump motor; The control unit performs the following diagnostic steps: The system reads the real-time flow rate value monitored by the flow sensor and the real-time operating current value monitored by the current sensor in real time. When the real-time operating current value is lower than the preset current threshold range, and the real-time flow rate value remains 0 for a continuous period of time, the control unit determines that the bacterial solution is exhausted or the supply pump is running dry, and sends a signal to make the status indicator light emit the first alarm mode. When the real-time operating current value exceeds the preset current threshold range, and the real-time flow rate value remains 0 for an extended period of time, the control unit determines that the supply pump or pipeline is blocked, and sends a signal to cause the status indicator light to issue a second alarm mode.

[0011] Preferably, the solar panel is connected to a battery that supplies power to the control unit, the electric stirrer, and the supply pump. The control unit is also electrically connected to a voltage sensor, the detection terminal of which is connected to the positive and negative electrodes of the battery to monitor the real-time voltage value of the battery. The control unit performs the following energy management steps: When the voltage value detected by the voltage sensor is higher than the first voltage threshold, the electric stirrer and the supply pump are controlled to operate at rated power. When the voltage value detected by the voltage sensor is lower than the first voltage threshold and higher than the second voltage threshold, the electric stirrer is controlled to switch to intermittent operation mode, and the speed of the supply pump is maintained. When the voltage value detected by the voltage sensor is lower than the second voltage threshold, the electric stirrer and the supply pump are controlled to enter a low-power sleep mode, and only the basic standby functions of the control unit, the GPS positioning module and the communication module are maintained.

[0012] Preferably, the bottom of the bacterial liquid storage tank is conical, with the cone angle ranging from 60 degrees to 90 degrees. The discharge port of the bacterial liquid storage tank is located at the lowest point of the conical bottom; An electric heating belt is attached to the outer wall of the bacterial liquid storage tank; The first pipe is a flexible hose, a portion of which is coiled and directly attached to the outer surface of the electric heating band; the control unit is electrically connected to and controls the start and stop of the electric heating band.

[0013] Preferably, it also includes a clean water tank, a three-way valve, and a drain valve; The outlet of the clean water tank is connected to the first inlet of the three-way valve via a fourth pipe; The discharge port of the bacterial liquid storage tank is connected to the second inlet of the three-way valve through the first pipe; The outlet of the three-way valve is connected to the inlet of the supply pump via a fifth pipe; The inlet of the drain valve is connected to the second pipe via the sixth pipe; The control unit is electrically connected to the three-way valve and the drain valve and controls the switching between the three-way valve and the drain valve; The control unit executes the following cleaning procedure: it controls the three-way valve to switch its first inlet and outlet to be connected, opens the drain valve, and starts the supply pump, so that clean water flows through the supply pump and the drain valve in sequence to be discharged, thereby flushing the supply pump and the second pipeline.

[0014] Preferably, it also includes a dissolved oxygen sensor and an electric gas volume regulating valve; The dissolved oxygen sensor is located at the outlet of the venturi tube diffusion section and is used to monitor the real-time dissolved oxygen value of the mixture. The electric air volume regulating valve is installed on the third pipe and is used to regulate the air flow entering the venturi throat section; The control unit is electrically connected to the dissolved oxygen sensor and the electric gas flow regulating valve; the control unit has a pre-stored dissolved oxygen setpoint; the control unit performs the following operations: receiving the real-time dissolved oxygen value monitored by the dissolved oxygen sensor, comparing it with the dissolved oxygen setpoint, and sending a control signal to the electric gas flow regulating valve according to the comparison result, dynamically adjusting its opening degree, so that the real-time dissolved oxygen value of the mixture is stabilized at the setpoint.

[0015] The present invention has at least the following beneficial effects: First, by setting up a bacterial liquid storage tank equipped with an electric stirrer and multi-layer blades, the microbial agent can be continuously and thoroughly mechanically stirred before addition, effectively preventing the agent from settling or flocculating, and ensuring that the concentration of the mixed liquid in the storage tank is uniform, which provides a foundation for subsequent stable and accurate addition.

[0016] Secondly, a supply pump is used to deliver the bacterial solution to the inlet of the Venturi tube. Utilizing the negative pressure effect formed by the constricted section of the Venturi tube throat, air is automatically drawn in through the opening in the tube wall and formed into tiny bubbles through the microporous aeration head. This achieves the initial mixing and efficient oxygenation of the gas, liquid, and bacterial agent in the throat section, significantly increasing the dissolved oxygen content in the mixed solution, thereby ensuring that the aerobic microorganisms have high biological activity at the moment of release.

[0017] Furthermore, the Venturi tube structure itself has mixing and pressurization diffusion functions. After being mixed in the throat, the oxygen-enriched bacterial solution has a reduced flow rate and increased pressure in the diffusion section, which further promotes fluid homogenization and bubble refinement. Finally, it is released into the water through the mixed solution delivery pipe, which improves the uniformity of bacterial agent distribution and diffusion efficiency in the water.

[0018] In addition, the entire device centrally controls the start-up, shutdown, and operation coordination of the electric mixer and supply pump through the control unit, realizing the automated linkage of the mixing, conveying, oxygenation, and dosing processes. This not only reduces the intensity of manual operation but also improves the controllability and reliability of the dosing process, which is conducive to achieving stable and efficient water body remediation operations under different water quality conditions.

[0019] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the microbial dispensing device for water quality improvement according to one of the technical solutions of the present invention.

[0021] Figure reference numerals: 1-Bacterial liquid storage tank; 2-Sealed cover; 3-Electric stirrer; 4-Supply pump; 5-First pipe; 6-Second pipe; 7-Venturi tube; 8-Microporous aerator head; 9-Mixed liquid delivery pipe; 10-Check valve; 11-Float body; 12-Solar panel; 13-Probe part; 14-Flow sensor; 15-Proportional regulating valve; 16-Battery; 17-Third pipe; 18-Fourth pipe; 19-Clear water tank; 20-Three-way valve; 22-Fifth pipe; 23-Sixth pipe; 24-Drain valve; 25-Water body. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0023] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0024] like Figure 1 As shown, the present invention provides a microbial dispensing device for water quality improvement, comprising: The bacterial liquid storage tank 1 has an open top and a discharge port at the bottom, and the open part of the bacterial liquid storage tank 1 is provided with a sealing cover 2; An electric stirrer 3 is vertically mounted on the sealing cover 2. The stirring shaft of the electric stirrer 3 extends to the bottom of the bacterial liquid storage tank 1, and at least two layers of blades are fixed on the stirring shaft. The supply pump 4 has its inlet connected to the discharge port of the bacterial liquid storage tank 1 via the first pipe 5; The Venturi tube 7 has its inlet section connected to the outlet of the supply pump 4 via a second pipe 6. The ratio of the diameter of the throat section of the Venturi tube 7 to the diameter of its inlet section is 1:2 to 1:3. An opening is provided in the wall of the throat section of the Venturi tube 7. The microporous aeration head 8 is connected to the opening of the pipe wall through the third pipe 17, and the third pipe 17 is equipped with a check valve 10; Mixture delivery pipe 9 is connected to the outlet of the diffusion section of venturi tube 7; The control unit is electrically connected to the electric mixer 3 and the supply pump 4 and controls the start and stop of the electric mixer 3 and the supply pump 4.

[0025] In the above technical solution, the capacity of the bacterial liquid storage tank 1 can be selected from 100L to 500L. The top is open for adding bacterial agents and water, and the bottom can be a conical or flat-bottomed structure with a discharge port. The diameter of the discharge port can be selected from 25mm to 40mm. The sealing cover 2 can be made of polypropylene or stainless steel and connected to the open end of the storage tank via a flange or clamp to ensure sealing. The electric agitator 3 can be driven by a low-speed motor with a power between 50W and 200W. The agitator shaft extends into the bottom of the tank, and two or four layers of inclined or propeller blades can be installed on the shaft. The blade inclination angle can be selected from 30° to 45°, and the rotation speed can be controlled between 60r / min and 120r / min to maintain the uniform suspension of the bacterial liquid and prevent sedimentation.

[0026] The supply pump 4 can be a peristaltic pump or a corrosion-resistant centrifugal pump. Its inlet is connected to the discharge port at the bottom of the bacterial liquid storage tank 1 via the first pipe 5. This pipe can be a food-grade flexible hose or a rigid polyethylene pipe with an inner diameter of 10mm to 20mm. The inlet section of the Venturi tube 7 is connected to the outlet of the supply pump 4 via the second pipe 6. The pipe material can be UPVC or stainless steel, and its inner diameter is consistent with that of the inlet section of the Venturi tube 7. The ratio of the diameter of the throat section to the diameter of the inlet section of the Venturi tube 7 can be set to 1:2 to 1:3. For example, when the diameter of the inlet section is 20mm, the diameter of the throat section can be 8mm. It should be noted that the diameters of the throat section and the inlet section of the Venturi tube 7 refer to the inner diameters. The diameter of the inlet section of the Venturi tube 7 specifically refers to the inner diameter of the pipe at the inlet port. An opening is made in the wall of the throat section, with a diameter of 5mm to 8mm, for connecting to the aeration pipe (third pipe 17).

[0027] The microporous aerator head 8 can be a disc-type or tubular ceramic or rubber aerator element, connected to the opening in the throat of the Venturi tube 7 via a pipe. A check valve 10 is installed on this pipe to prevent backflow. The mixed liquid delivery pipe 9 connects to the outlet of the diffuser section of the Venturi tube 7 and can be a flexible hose or rigid PVC pipe, with a length that can be configured according to actual needs, generally 5m to 10m. The control unit can be a programmable logic controller (PLC) or a microcontroller system, installed in a waterproof control box, and electrically connected to the electric mixer 3 and the supply pump 4, used to set and control the start-up and shutdown sequence and operating time of the equipment.

[0028] When the device is in operation, the electric stirrer 3 is first started to continuously stir the bacterial solution, and then the supply pump 4 is started to transport the bacterial solution from the storage tank to the Venturi tube 7. At the throat of the Venturi tube 7, the increased water flow velocity creates negative pressure, and air is drawn in and forms fine bubbles through the microporous aeration head 8, achieving gas-liquid mixing and dissolved oxygen. After the bacterial solution and oxygen-enriched air are further mixed in the diffusion section of the Venturi tube 7, they are released into the target water area through the mixed solution delivery pipe 9.

[0029] This implementation method enables integrated operation of mechanical stirring, Venturi negative pressure aeration, and controlled delivery of microbial agents, which helps improve the dispersibility and dissolved oxygen level of the agents in water bodies 25 and is suitable for bioremediation projects in still or slow-flowing water bodies 25 such as lakes and ponds.

[0030] In another technical solution, a float 11 is also included, on which the bacterial liquid storage tank 1, electric stirrer 3, supply pump 4, venturi tube 7 and control unit are all fixedly installed; The floating body 11 is equipped with a solar panel 12, which is electrically connected to the control unit to provide power to the microbial dispensing device for water quality improvement. The float 11 is also equipped with a GPS positioning module, which is electrically connected to the control unit. In the above technical solution, the float 11 can be a boat-shaped float 11 or a platform-type float 11 made of high-density polyethylene, with a length of 2m to 3m and a width of 1m to 1.5m, providing sufficient buoyancy to support the entire equipment. The bacterial solution storage tank 1, electric agitator 3, supply pump 4, venturi tube 7, and control unit are all fixed to the deck of the float 11 by bolts or clamps. The bacterial solution storage tank 1 is located in the middle of the float 11, the control unit is installed in a waterproof electrical control box inside the front of the float 11, and the supply pump 4 and venturi tube 7 are arranged near the tank outlet. The length of the pipeline connections between the various devices is controlled within 1m to reduce fluid resistance.

[0031] The solar panel 12 can be a monocrystalline silicon or polycrystalline silicon module with a power of 100W to 300W, and is fixedly installed on the upper frame of the float 11 at a tilt angle of 15° to 30°. The solar panel 12 is connected to the control unit via a waterproof cable, and the battery 16 is charged via the MPPT controller. The battery 16 can be a gel lead-acid battery or a lithium-ion battery with a capacity of 50Ah to 200Ah, and is installed in a waterproof battery box to provide power to the entire system. The GPS positioning module can be a Beidou / GPS dual-mode positioning device, installed on the upper part of the float 11, and connected to the control unit via RS485 or 4G communication to upload location information in real time.

[0032] In this embodiment, the float 11 provides a floating platform for the entire device. The solar panel 12 converts solar energy into electrical energy, which is stored in the battery 16 to power the electric stirrer 3, the supply pump 4, and the control unit. The GPS positioning module monitors the position of the float 11 in real time, allowing maintenance personnel to understand the distribution and working status of the equipment. The arrangement of each device on the float 11 takes into full consideration the balance of the center of gravity and the convenience of maintenance. The bacterial liquid storage tank 1 is located in the middle of the float 11 to maintain stability, and the electrical control equipment is placed at the front to avoid water splashing in.

[0033] This implementation method enables the microbial delivery device to operate autonomously on water, the solar power system can meet the needs of long-term continuous operation, and the GPS positioning function facilitates the network management and location monitoring of multiple devices, making it suitable for distributed water quality improvement operations in large water areas.

[0034] In another technical solution, a turbidity sensor, a flow sensor 14, and a proportional control valve 15 are also included. The turbidity sensor is located on the side of the inlet of the mixed liquid delivery pipe 9 away from the Venturi tube 7, and is used to monitor the turbidity value of the water at the delivery point. The flow sensor 14 is installed on the second pipe 6 and is used to monitor the real-time flow value of the microbial agent mixture. The proportional regulating valve 15 is disposed on the second pipeline 6 and is located on the side of the flow sensor 14 near the supply pump 4; The control unit is electrically connected to the turbidity sensor, the flow sensor 14, and the proportional control valve 15. The control unit has a pre-stored correspondence between the turbidity value of the water body at 25°C and the set value of the total amount of microbial agent to be added; the control unit executes the following control steps: Read the current turbidity value of the water body monitored by the turbidity sensor, and calculate the required total amount of microbial agent to be added based on the corresponding relationship; Based on the total amount of microbial agent added and the known fixed concentration of the mixture in the agent storage tank, the flow rate setting of the microbial agent mixture is calculated. Read the real-time flow value monitored by the flow sensor 14; The real-time flow value is compared with the calculated flow set value, and a control signal is sent to the proportional regulating valve 15 to dynamically adjust its opening so that the real-time flow value approaches the flow set value. In the above technical solution, the turbidity sensor can be an online monitoring instrument based on the optical scattering principle, with a range of 0-1000 NTU and an accuracy of ±5%. It is installed 50 cm downstream of the outlet of the mixed liquid delivery pipe 9 and can be fixed to the float 11 or the mixed liquid delivery pipe 9 using a stainless steel clamp. Its probe part 13 is submerged in water and is used to monitor the turbidity changes of the water body 25 at the delivery point in real time. The flow sensor 14 can be an electromagnetic flow meter or an ultrasonic flow meter, with a range of 0.5-10 L / min and an accuracy of ±2%. It is installed in the middle of the second pipe 6, about 30 cm from the inlet of the venturi tube 7. The sensor is connected to the pipe through a flange to ensure sealing. The proportional regulating valve 15 can be an electric regulating valve or a pneumatic regulating valve, with a diameter of 15 mm to 25 mm. It is installed on the second pipe 6, located 20 cm upstream of the flow sensor 14. The valve body material can be stainless steel or UPVC, which has good corrosion resistance.

[0035] The control unit can be an industrial PLC or an embedded controller, with a pre-stored table showing the correspondence between 25 NTU turbidity values ​​in the water and the total dosage of microbial agents. The correspondence can be set such that the total dosage is 0.5 g / m³ when the turbidity value is 0-50 NTU. 3 At 50-200 NTU, it is 1.0 g / m³. 3 At 200-500 NTU, it is 2.0 g / m³. 3 When the concentration is above 500 NTU, it is 3.0 g / m³. 3The control unit connects to each sensor and actuator via a 4-20mA analog signal or Modbus communication protocol. Every 5 minutes, the control unit reads the current turbidity value of the water body monitored by the turbidity sensor, calculates the required total dosage setpoint for the microbial agent based on pre-stored correlations, and then calculates the flow rate setpoint for the microbial agent mixture based on the known fixed concentration of the mixture in the agent storage tank, such as 10 g / L (this fixed concentration is set according to actual conditions). The calculation formula is: Flow rate setpoint (L / min) = Total dosage setpoint (g / m³) 3 )×water body 25 flow rate (m 3 / min) / mixture concentration (g / L).

[0036] The control unit reads the real-time flow value monitored by the flow sensor 14, and uses a PID control algorithm to compare the real-time flow value with the calculated flow setpoint. It then outputs a 4-20mA control signal to the proportional regulating valve 15, dynamically adjusting its opening to stabilize the real-time flow value near the flow setpoint, achieving a control accuracy of ±5%. When turbidity values ​​change abruptly, the control system's response time is less than 30 seconds, enabling rapid adjustment of the dosage to adapt to water quality changes.

[0037] This implementation method automatically adjusts the dosage of microbial agents by monitoring the 25°C turbidity of the water in real time, achieving precise dosing as needed. When the 25°C turbidity is high, the dosage of agents is increased; when the turbidity is low, the dosage is reduced, ensuring both water treatment effectiveness and avoiding agent waste. This system is suitable for aquatic environments with significant water quality fluctuations, automatically adjusting the treatment intensity according to changes in water quality, thus improving treatment efficiency and economy.

[0038] In another technical solution, the control unit is also electrically connected to a current sensor and a status indicator light; The current sensor is used to monitor the real-time operating current value of the motor of the supply pump 4. The control unit performs the following diagnostic steps: The real-time flow rate value monitored by the flow sensor 14 and the real-time operating current value monitored by the current sensor are read in real time. When the real-time operating current value is lower than the preset current threshold range, and the real-time flow rate value remains 0 for a continuous period of time, the control unit determines that the bacterial solution is exhausted or the supply pump 4 is running dry, and sends a signal to make the status indicator light emit the first alarm mode. When the real-time operating current value exceeds the preset current threshold range, and the real-time flow value remains 0 for an extended period of time, the control unit determines that the supply pump 4 is blocked or the pipeline is blocked, and sends a signal to make the status indicator light emit a second alarm mode. In the above technical solution, a Hall effect current sensor with a range of 0-5A and an accuracy of ±1% can be selected. It is installed in the power supply line to the motor of pump 4 to monitor the motor's operating current in real time. A tri-color LED indicator can be used as the status indicator, installed on the control unit panel, using different colors and flashing patterns to indicate the equipment status. The control unit can be an industrial PLC with analog input and digital output functions, a sampling frequency of 10Hz, and the ability to acquire and process current and flow data in real time.

[0039] The preset current threshold range in the control unit can be set from 0.5A to 2.0A, with a lower current limit of 0.5A and an upper current limit of 2.0A. The first set time can be set to 30 seconds, and the second set time can be set to 10 seconds. When the real-time operating current value is below 0.5A and the real-time flow rate remains 0 for more than 30 seconds, the control unit determines that the bacterial solution is depleted or the supply pump 4 is running dry, and the control status indicator flashes a red signal at a frequency of 60 times per minute. When the real-time operating current value exceeds 2.0A and the real-time flow rate remains 0 for more than 10 seconds, the control unit determines that the supply pump 4 is blocked or the pipeline is blocked, and the control status indicator flashes a red signal rapidly at a frequency of 120 times per minute.

[0040] The operation of this implementation is as follows: During system operation, the control unit continuously collects monitoring data from the flow sensor 14 and the current sensor. When an abnormal operating condition is detected, the control unit performs fault diagnosis based on preset current and time thresholds. For cases of bacterial solution depletion or idling, the operating current decreases significantly due to reduced pump load; for cases of blockage, the operating current increases significantly due to increased resistance. By combining abnormal current and the duration of zero flow, the control system can accurately distinguish between different types of faults and provide clear visual alarm prompts through status indicator lights.

[0041] This implementation method can monitor the working status of the supply pump 4 in real time, detect common operational faults in a timely manner, and remind operators to handle them through indicator light alarms. This helps to improve the reliability and maintenance efficiency of equipment operation, reduce downtime caused by faults, and ensure the continuity and stability of water quality improvement operations.

[0042] In another technical solution, the solar panel 12 is connected to a storage battery 16, which supplies power to the control unit, the electric stirrer 3, and the supply pump 4; The control unit is also electrically connected to a voltage sensor, the detection end of which is connected to the positive and negative electrodes of the battery 16 to monitor the real-time voltage value of the battery 16. The control unit performs the following energy management steps: When the voltage value detected by the voltage sensor is higher than the first voltage threshold, the electric stirrer 3 and the supply pump 4 are controlled to operate at rated power. When the voltage value detected by the voltage sensor is lower than the first voltage threshold and higher than the second voltage threshold, the electric stirrer 3 is controlled to switch to intermittent operation mode and the speed of the supply pump 4 is maintained. When the voltage value detected by the voltage sensor is lower than the second voltage threshold, the electric stirrer 3 and the supply pump 4 are controlled to enter a low-power sleep mode, and only the basic standby functions of the control unit, the GPS positioning module and the communication module are maintained. In the above technical solution, the solar panel 12 can be a monocrystalline silicon photovoltaic module with a conversion efficiency ≥20% and a rated power of 200W. It is fixedly installed on the upper frame of the float 11 at a 25° tilt angle using an aluminum bracket. The battery 16 can be a 12V / 100Ah gel lead-acid battery, installed in a waterproof battery box and positioned in the middle of the float 11. The voltage sensor can be a resistance voltage divider type voltage detection module with a range of 0-15V and an accuracy of ±0.1V. The detection end is directly connected to the positive and negative electrodes of the battery 16 through a wiring terminal to monitor the voltage of the battery 16 in real time.

[0043] The first voltage threshold in the control unit can be set to 12.2V, and the second voltage threshold can be set to 11.8V, depending on the actual situation. When the voltage sensor detects that the battery voltage 16 is higher than 12.2V, the control unit controls the electric mixer 3 to run continuously at rated power, and the supply pump 4 to operate at rated speed. When the voltage value is lower than 12.2V but higher than 11.8V, the control unit controls the electric mixer 3 to switch to intermittent operation mode, working for 2 minutes and stopping for 5 minutes, while maintaining the rated speed of the supply pump 4 unchanged. When the voltage value is lower than 11.8V, the control unit controls all power equipment to enter a low-power sleep mode. The electric mixer 3 and the supply pump 4 stop working, and only the basic standby functions of the control unit, GPS positioning module, and 4G communication module are maintained, with standby power consumption not exceeding 5W.

[0044] In this embodiment, the solar panel 12 converts solar energy into electrical energy and stores it in the battery 16. A voltage sensor monitors the voltage status of the battery 16 in real time. The control unit automatically adjusts the device's operating mode based on the voltage value, ensuring full-power operation when the power is sufficient and prioritizing core functions when the power is insufficient, thus extending the system's operating time. The GPS positioning module can upload the device's location information in real time, and the communication module can periodically send system status data to the monitoring center.

[0045] This implementation method uses intelligent energy management to automatically adjust the equipment operation strategy according to the battery 16 power status, which not only ensures the water quality improvement operation effect, but also effectively extends the continuous working time of the system. It is particularly suitable for rainy weather or multi-day continuous operation scenarios, and improves the environmental adaptability and operational reliability of the equipment.

[0046] In another technical solution, the bottom of the bacterial liquid storage tank 1 is conical, and the cone angle is in the range of 60 degrees to 90 degrees. The discharge port of the bacterial liquid storage tank 1 is located at the lowest point of the conical bottom; An electric heating belt is attached to the outer wall of the bacterial liquid storage tank 1; The first pipe 5 is a flexible hose, a portion of which is coiled and directly attached to the outer surface of the electric heating band; the control unit is electrically connected to and controls the start and stop of the electric heating band; In the above technical solution, the bottom of the bacterial liquid storage tank 1 can be designed as a conical structure, with a cone angle of 70° or 80°, and the cone height accounting for 20% to 30% of the total tank height. The discharge port is located at the lowest point of the conical bottom, with a diameter of 25mm, and is connected by a flange. The main body of the storage tank can be made of polyethylene or stainless steel, with a wall thickness of 3mm to 5mm and a volume of 200L. The electric heating belt can be a silicone rubber heating belt, which is attached to the lower area of ​​the outer wall of the storage tank using aluminum foil tape or stainless steel cable ties, covering more than 70% of the surface area of ​​the conical bottom.

[0047] The first pipe 5 can be a silicone hose or EPDM hose with an inner diameter of 12mm. One end of the hose is spirally wound around the outer surface of the electric heating belt, ensuring full contact with the heating belt surface. The control unit can be a PLC with temperature control function, equipped with a PT100 temperature sensor to detect the ambient temperature. The temperature sensor probe is installed on the outer wall of the storage tank. The control unit sets the heating start and stop temperatures to 10℃ and 15℃. When the ambient temperature is below 10℃, the electric heating belt is activated; when it is above 15℃, heating is stopped.

[0048] In this embodiment, the conical bottom structure facilitates the accumulation and complete drainage of the bacterial solution, preventing residue. The electric heating belt heats the tank wall through heat conduction, indirectly keeping the bacterial solution inside the tank warm. The flexible hose coiled around the heating belt is simultaneously directly heated, preventing the bacterial solution from solidifying or crystallizing inside the pipes at low temperatures. A temperature sensor monitors the ambient temperature in real time, and the control unit automatically controls the start and stop of the electric heating belt according to the set temperature, maintaining the bacterial solution temperature within a suitable range for microbial activity.

[0049] This implementation method can effectively maintain the fluidity of the bacterial solution in a low-temperature environment, prevent the microbial agent from becoming inactive or precipitating due to low temperature, ensure the normal delivery function of the supply pump 4, extend the service life of the equipment in the low-temperature season, and improve the environmental adaptability and operational stability of the water quality improvement device.

[0050] In another technical solution, a clean water tank 19, a three-way valve 20, and a drain valve 24 are also included; The outlet of the clean water tank 19 is connected to the first inlet of the three-way valve 20 via the fourth pipe 18; The discharge port of the bacterial liquid storage tank 1 is connected to the second inlet of the three-way valve 20 through the first pipe 5; The outlet of the three-way valve 20 is connected to the inlet of the supply pump 4 via the fifth pipe 22; The inlet of the drain valve 24 is connected to the second pipe 6 via the sixth pipe 23; The control unit is electrically connected to the three-way valve 20 and the drain valve 24 and controls the switching of the three-way valve 20 and the drain valve 24; The control unit executes the following cleaning procedure: controls the three-way valve 20 to switch its first inlet and outlet to connect, opens the drain valve 24, and starts the supply pump 4, so that clean water flows through the supply pump 4 and the drain valve 24 in sequence to be discharged, thereby flushing the supply pump 4 and the second pipe 6. In the above technical solution, the clean water tank 19 can be a 100L square water tank made of polyethylene, installed next to the bacterial liquid storage tank 1, with the bottom outlet height higher than the inlet of the supply pump 4. The three-way valve 20 can be an electric three-way ball valve made of UPVC material, with a diameter of 20mm, installed on the pipe at the front end of the inlet of the supply pump 4 and fixed by a bracket. The drain valve 24 can be a UPVC ball valve with a diameter of 20mm, installed on the branch pipe of the second pipe 6 near the inlet of the venturi tube 7. The fourth pipe 18, the fifth pipe 22, and the sixth pipe 23 can all be made of UPVC rigid pipe or food-grade flexible hose, with an inner diameter of 15mm to 20mm, and the pipe connections are made using quick-connect clamps or flanges.

[0051] The control unit can be a PLC controller with digital output function, connected to the electric actuators of the three-way valve 20 and the drain valve 24 via cables. The control unit has a preset cleaning program. When the cleaning mode is activated, the control unit first controls the three-way valve 20 to switch to the first inlet and outlet connection state, creating a passage between the clean water tank 19 and the supply pump 4. Simultaneously, the drain valve 24 is opened, closing the passage to the venturi tube 7. Then, the supply pump 4 is started and runs at the rated flow rate for 5 to 10 minutes. Clean water flows sequentially through the fourth pipe 18, the three-way valve 20, the fifth pipe 22, the supply pump 4, the second pipe 6, and the drain valve 24 before being discharged, thus flushing the internal cavity of the supply pump 4 and the second pipe 6.

[0052] In this embodiment, the clean water tank 19 normally stores cleaning water, and the three-way valve 20 is used to switch between two working modes: bacterial solution delivery and clean water rinsing. During equipment maintenance, the automatic cleaning program is activated by the control unit, using clean water to backwash the supply pump 4 and the piping system, effectively removing residual bacterial solution and impurities. The drain valve 24 directly discharges the rinsing wastewater, avoiding contamination of the clean water tank 19 and the bacterial solution storage tank 1. The arrangement of valves and pipes ensures that the cleaning solution flows through all components that need cleaning, and the cleaning process does not require disassembly of the equipment, making operation simple.

[0053] This implementation method can automatically clean the delivery system periodically, preventing the microbial agent from accumulating and solidifying in the pump body and pipelines, reducing equipment maintenance workload, extending the service life of pumps and pipelines, and ensuring the long-term reliability and stability of the microbial dispensing device.

[0054] Another technical solution also includes a dissolved oxygen sensor and an electric gas volume regulating valve; The dissolved oxygen sensor is located at the outlet of the diffusion section of the Venturi tube 7 and is used to monitor the real-time dissolved oxygen value of the mixture. The electric air volume regulating valve is installed on the third pipe 17 and is used to regulate the air flow entering the throat section of the Venturi tube 7; The control unit is electrically connected to the dissolved oxygen sensor and the electric gas flow regulating valve; the control unit has a pre-stored dissolved oxygen setpoint; the control unit performs the following operations: receiving the real-time dissolved oxygen value monitored by the dissolved oxygen sensor, comparing it with the dissolved oxygen setpoint, and sending a control signal to the electric gas flow regulating valve according to the comparison result, dynamically adjusting its opening degree, so that the real-time dissolved oxygen value of the mixture is stabilized at the setpoint. In the above technical solution, the dissolved oxygen sensor can be an online monitoring probe based on fluorescence or electrochemical principles, installed at the outlet of the diffusion section of the Venturi tube 7. The dissolved oxygen sensor can be fixed to the float 11 or the Venturi tube 7 using a stainless steel clamp. The probe part 13 is immersed in the liquid flow out of the diffusion section of the Venturi tube 7 to monitor the dissolved oxygen content of the mixture in real time. The electric gas volume regulating valve can be a proportional regulating valve 15 driven by a stepper motor, with a diameter of 8mm to 12mm, installed in the middle of the third pipe 17, about 20cm away from the throat opening of the Venturi tube 7. The valve body material can be stainless steel or brass, which has good corrosion resistance.

[0055] The control unit can be an industrial controller with PID control, featuring a built-in dissolved oxygen setpoint range of 5 mg / L to 8 mg / L, which can be adjusted according to the aerobic characteristics of different microbial agents. The control unit acquires real-time monitoring data from the dissolved oxygen sensor via a 4-20mA analog signal, with a sampling interval of 2 seconds. When the real-time dissolved oxygen value deviates from the setpoint, the control unit uses a proportional-integral control algorithm to output a PWM signal to drive the opening of the electric gas volume regulating valve. The opening adjustment range is 0-100%, with a response time of less than 5 seconds. When the dissolved oxygen value is lower than the setpoint, the opening is increased; when it is higher, the opening is decreased, stabilizing the dissolved oxygen value of the mixture within the setpoint ± 0.5 mg / L range.

[0056] In this embodiment, a dissolved oxygen sensor monitors the dissolved oxygen level of the mixture at the outlet of the Venturi tube 7 in real time, and an electric air volume regulating valve precisely controls the airflow entering the throat of the Venturi tube 7. The control unit, through a closed-loop control algorithm, automatically adjusts the opening of the air volume valve based on the deviation between the monitored dissolved oxygen value and the set value, achieving precise control of the aeration rate. This control method can adapt to changes in operating conditions such as different water depths and temperatures, maintaining the microbial agent under optimal dissolved oxygen conditions.

[0057] This implementation method ensures that the dissolved oxygen level is maintained at an appropriate level when the microbial agent is added through real-time monitoring and automatic adjustment, thereby improving the activity of aerobic microorganisms and enhancing the water quality improvement effect. The system can automatically optimize the aeration rate according to the actual working conditions, ensuring the treatment effect while avoiding energy waste caused by over-aeration, making it suitable for bioremediation environments with high dissolved oxygen requirements.

[0058] The number of devices and processing scale described herein are for the purpose of simplifying the description of the invention. Applications, modifications, and variations of the microbial dispensing device for water quality improvement of the present invention will be readily apparent to those skilled in the art.

[0059] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A microbial dispensing device for water quality improvement, characterized in that, include: A bacterial liquid storage tank has an open top and a discharge port at the bottom, and the open part of the bacterial liquid storage tank is equipped with a sealing cover; An electric stirrer is vertically mounted on the sealing cover. The stirring shaft of the electric stirrer extends to the bottom of the bacterial liquid storage tank, and at least two layers of blades are fixed on the stirring shaft. The supply pump has its inlet connected to the discharge port of the bacterial liquid storage tank via a first pipeline; The Venturi tube has its inlet section connected to the outlet of the supply pump via a second pipe. The ratio of the diameter of the throat section of the Venturi tube to the diameter of its inlet section is 1:2 to 1:

3. An opening is provided in the wall of the throat section of the Venturi tube. A microporous aeration head is connected to the opening in the pipe wall through a third pipe, and a check valve is provided on the third pipe; The mixing liquid delivery pipe is connected to the outlet of the venturi tube diffuser section; The control unit is electrically connected to the electric mixer and the supply pump and controls the start and stop of the electric mixer and the supply pump.

2. The microbial dispensing device for water quality improvement as described in claim 1, characterized in that, It also includes a float, on which the bacterial liquid storage tank, electric stirrer, supply pump, venturi tube and control unit are all fixedly installed; The floating body is equipped with a solar panel, which is electrically connected to the control unit to power the microbial dispensing device for water quality improvement. The buoy is also equipped with a GPS positioning module, which is electrically connected to the control unit.

3. The microbial dispensing device for water quality improvement as described in claim 1, characterized in that, It also includes turbidity sensors, flow sensors, and proportional control valves; The turbidity sensor is located on the side of the inlet of the mixed liquid delivery pipe away from the Venturi tube, and is used to monitor the turbidity value of the water at the delivery point. The flow sensor is installed on the second pipe to monitor the real-time flow value of the microbial agent mixture; The proportional regulating valve is installed on the second pipeline and is located on the side of the flow sensor closer to the supply pump; The control unit is electrically connected to the turbidity sensor, the flow sensor, and the proportional control valve. The control unit stores a pre-defined relationship between water turbidity values ​​and the total set value of microbial agent dosage; the control unit executes the following control steps: Read the current turbidity value of the water body monitored by the turbidity sensor, and calculate the required total amount of microbial agent to be added based on the corresponding relationship; Based on the total amount of microbial agent added and the known fixed concentration of the mixture in the agent storage tank, the flow rate setting of the microbial agent mixture is calculated. Read the real-time flow value monitored by the flow sensor; The real-time flow rate is compared with the calculated flow rate setpoint, and a control signal is sent to the proportional control valve to dynamically adjust its opening so that the real-time flow rate approaches the flow rate setpoint.

4. The microbial dispensing device for water quality improvement as described in claim 3, characterized in that, The control unit is also electrically connected to a current sensor and a status indicator light; The current sensor is used to monitor the real-time operating current value of the supply pump motor; The control unit performs the following diagnostic steps: The real-time flow rate value monitored by the flow sensor and the real-time operating current value monitored by the current sensor are read in real time. When the real-time operating current value is lower than the preset current threshold range, and the real-time flow rate value remains 0 for a continuous period of time, the control unit determines that the bacterial solution is exhausted or the supply pump is running dry, and sends a signal to make the status indicator light emit the first alarm mode. When the real-time operating current value exceeds the preset current threshold range, and the real-time flow rate value remains 0 for an extended period of time, the control unit determines that the supply pump or pipeline is blocked, and sends a signal to cause the status indicator light to issue a second alarm mode.

5. The microbial dispensing device for water quality improvement as described in claim 2, characterized in that, The solar panel is connected to a battery, which powers the control unit, the electric stirrer, and the supply pump. The control unit is also electrically connected to a voltage sensor, the detection terminal of which is connected to the positive and negative electrodes of the battery to monitor the real-time voltage value of the battery. The control unit performs the following energy management steps: When the voltage value detected by the voltage sensor is higher than the first voltage threshold, the electric stirrer and the supply pump are controlled to operate at rated power. When the voltage value detected by the voltage sensor is lower than the first voltage threshold and higher than the second voltage threshold, the electric stirrer is controlled to switch to intermittent operation mode, and the speed of the supply pump is maintained. When the voltage value detected by the voltage sensor is lower than the second voltage threshold, the electric stirrer and the supply pump are controlled to enter a low-power sleep mode, and only the basic standby functions of the control unit, the GPS positioning module and the communication module are maintained.

6. The microbial dispensing device for water quality improvement as described in claim 4, characterized in that, The bottom of the bacterial liquid storage tank is conical, with a cone angle ranging from 60 to 90 degrees. The discharge port of the bacterial liquid storage tank is located at the lowest point of the conical bottom; An electric heating belt is attached to the outer wall of the bacterial liquid storage tank; The first conduit is a flexible hose, a portion of which is coiled and directly attached to the outer surface of the electric heating band; the control unit is electrically connected to and controls the start and stop of the electric heating band.

7. The microbial dispensing device for water quality improvement as described in claim 1, characterized in that, It also includes a clean water tank, a three-way valve, and a drain valve; The outlet of the clean water tank is connected to the first inlet of the three-way valve via a fourth pipe; The discharge port of the bacterial liquid storage tank is connected to the second inlet of the three-way valve through the first pipe; The outlet of the three-way valve is connected to the inlet of the supply pump via a fifth pipe; The inlet of the drain valve is connected to the second pipe via the sixth pipe; The control unit is electrically connected to the three-way valve and the drain valve and controls the switching between the three-way valve and the drain valve; The control unit executes the following cleaning procedure: it controls the three-way valve to switch its first inlet and outlet to be connected, opens the drain valve, and starts the supply pump, so that clean water flows through the supply pump and the drain valve in sequence to be discharged, thereby flushing the supply pump and the second pipeline.

8. The microbial dispensing device for water quality improvement as described in claim 7, characterized in that, It also includes a dissolved oxygen sensor and an electric gas volume regulating valve; The dissolved oxygen sensor is located at the outlet of the venturi tube diffusion section and is used to monitor the real-time dissolved oxygen value of the mixture. The electric air volume regulating valve is installed on the third pipe and is used to regulate the air flow entering the venturi throat section; The control unit is electrically connected to the dissolved oxygen sensor and the electric gas flow regulating valve; the control unit has a pre-stored dissolved oxygen setpoint; the control unit performs the following operations: receiving the real-time dissolved oxygen value monitored by the dissolved oxygen sensor, comparing it with the dissolved oxygen setpoint, and sending a control signal to the electric gas flow regulating valve according to the comparison result, dynamically adjusting its opening degree, so that the real-time dissolved oxygen value of the mixture is stabilized at the setpoint.

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