An external water quality on-line monitoring device applied to anaerobic fermentation

Abstract

The utility model relates to water quality monitoring technical field, concretely is a kind of external water quality on-line monitoring device applied to anaerobic fermentation.The device includes water quality extraction device, water quality detection box and BOD sensor, one end of back liquid pipe and liquid suction pipe respectively into biogas slurry tank, the other end of liquid suction pipe is connected with the liquid inlet of peristaltic pump, the liquid outlet of peristaltic pump is connected with the liquid inlet of water quality detection box, the liquid outlet of water quality detection box is connected with the liquid inlet of BOD sensor, the liquid outlet of BOD sensor is connected with the other end of back liquid pipe;The one end pipe orifice side of liquid suction pipe into biogas slurry tank is fixed with weight, the one end of fine wire into biogas slurry tank is connected with weight, the other end of fine wire is wound on the roller of water quality extraction device.The utility model can control the liquid of different depths to be measured to be extracted, can also detect multiple parameters simultaneously, and can also be continuously monitored for a long time.

Description

Technical Field

[0001] This utility model relates to the field of water quality monitoring technology, specifically an external online water quality monitoring device for anaerobic fermentation, suitable for real-time detection and analysis of biogas slurry parameters in biogas projects in practical fields such as animal husbandry. Background Technology

[0002] Most of my country's existing water quality monitoring systems use outdated water quality analysis methods, often combining manual chemical testing with instrumental analysis. These systems are only semi-automated, resulting in significant waste of human and material resources. In biogas projects, due to the adaptability of microorganisms and the interactions between factors affecting biogas production, problems arising during anaerobic fermentation are difficult to detect until gas production significantly declines. Designing and implementing a more intelligent, real-time, and integrated analysis and prediction water quality monitoring system would be crucial for improving the accuracy of water quality monitoring and reducing manual labor. In biogas projects, monitoring the biogas slurry during fermentation, understanding its chemical parameters, and taking appropriate measures when the slurry is not in an optimal fermentation state can optimize the biogas project.

[0003] The patent with publication number CN222774561U proposes an online water quality monitoring device, which is mainly used to detect water samples at different depths. However, when the device extracts water samples at different depths, it needs to drive the sleeve to rotate through a motor so that the water inlet hole coincides with the water pipe inlet hole. Its control method is relatively simple, relies on the cooperation of motor and mechanical structure, lacks flexibility, and has a low level of intelligence.

[0004] Patent CN117420082A discloses an online water quality monitoring system and method, primarily designed for monitoring wastewater in discharge pipes. It utilizes a special structural design to reduce wastewater flow velocity and improve monitoring accuracy. However, this system is designed for monitoring wastewater in discharge pipes and is not suitable for monitoring biogas slurry during anaerobic fermentation in biogas projects. The different application scenarios result in its limited applicability in the biogas engineering field. Utility Model Content

[0005] The purpose of this invention is to provide an external online water quality monitoring device for anaerobic fermentation, which can control the extraction of test liquid at different depths, detect multiple parameters simultaneously, and perform long-term continuous monitoring.

[0006] This utility model provides the following technical solution:

[0007] An external online water quality monitoring device for anaerobic fermentation includes a water extraction device, a water quality testing box, and a BOD sensor. The biogas slurry tank cover has three holes. One end of a suction pipe, a thin thread, and a return pipe passes through one of these holes and enters the biogas slurry tank. The other end of the suction pipe is connected to the inlet of a peristaltic pump. The outlet of the peristaltic pump is connected to the inlet of the water quality testing box. The outlet of the water quality testing box is connected to the inlet of the BOD sensor. The outlet of the BOD sensor is connected to the other end of the return pipe. A weight is fixed to the side of the end of the suction pipe that enters the biogas slurry tank. One end of the thin thread that enters the biogas slurry tank is connected to the weight, and the other end of the thin thread is wound around the roller of the water extraction device.

[0008] The aforementioned external online water quality monitoring device for anaerobic fermentation includes a water extraction device comprising a thin wire, a roller, a bracket, a stepper motor, a wire, and a relay. The input terminal of the relay is connected to a computer, and the output terminal of the relay is connected to the input terminal of the stepper motor via a wire. The stepper motor is mounted on one side of the bracket, and the output terminal of the stepper motor is mounted on a roller on the other side of the bracket. A section of thin wire is wound on the roller.

[0009] The aforementioned external online water quality monitoring device for anaerobic fermentation has a thin thread and a weight tied to the opening of the suction pipe. The thin thread pulls the opening of the suction pipe through the weight. When the roller lifts and releases the thin thread, the position of the opening of the suction pipe moves up and down accordingly, thus controlling the lifting and lowering of the opening and its position.

[0010] The aforementioned external online water quality monitoring device for anaerobic fermentation has a filter screen at one end of the pumping pipe that enters the biogas slurry tank, and the other end of the pumping pipe is connected to a water quality testing box via a peristaltic pump and a flexible hose.

[0011] The aforementioned external online water quality monitoring device for anaerobic fermentation includes a water quality testing box comprising a testing box body, an inlet, a sensor, and an outlet. The top of the testing box body has an insertion hole through which one end of the sensor's detection head extends into the testing box body. The testing box body is provided with an inlet and an outlet, respectively. The inlet is connected to a peristaltic pump via a flexible tube, and the outlet is connected to a BOD sensor via a flexible tube.

[0012] The aforementioned external online water quality monitoring device for anaerobic fermentation uses temperature, pH, and ORP sensors, which are externally located and concentrated in the water quality detection box.

[0013] The aforementioned external online water quality monitoring device for anaerobic fermentation has a sensor pre-reserved port on the top of the detection box, allowing for the addition or removal of various types of sensors as needed.

[0014] The aforementioned external online water quality monitoring device for anaerobic fermentation has a waterproof gasket on the top of the detection box, which seals the inserted sensor.

[0015] The external online water quality monitoring device for anaerobic fermentation described above uses a dual-chamber microbial fuel cell as its BOD sensor.

[0016] The advantages and beneficial effects of this utility model are:

[0017] 1. This utility model uses a water quality extraction device, a water quality testing box, and a biochemical oxygen demand (BOD) sensor to realize intelligent online water quality monitoring. It optimizes the workflow of traditional water quality monitoring devices, realizes a water quality monitoring system that integrates real-time monitoring and analysis and prediction, and solves the problems of water quality monitoring lag and repetitive manual labor.

[0018] 2. This utility model uses an automated water extraction device that can be electronically controlled to extract biogas slurry from different depths; the external water quality detection box can detect different water quality parameters, which facilitates sensor replacement and maintenance; and the dual-chamber microbial fuel cell (MFC) is used as a BOD sensor, enabling rapid and continuous detection of BOD values.

[0019] 3. This utility model uses an external sensor, which makes it easier to replace and maintain. The special water extraction device can extract liquid from different depths for testing, reducing the use of sensors and saving costs. The use of relays and signal acquisition cards allows the entire device to be controlled by a computer and to acquire signals in real time, enabling long-term continuous monitoring.

[0020] 4. This utility model water quality testing box adopts a plug-in design, integrating multiple sensors such as a temperature sensor, pH sensor, and oxidation-reduction potential (ORP) sensor, enabling simultaneous monitoring of multiple key water quality parameters. The temperature sensor measures water temperature, the pH sensor detects the acidity or alkalinity of the water, and the ORP sensor monitors the oxidation-reduction potential of the water. This multi-parameter simultaneous detection method provides a more comprehensive reflection of water quality. The plug-in design allows each sensor to operate independently, avoiding mutual interference between sensors and improving the accuracy and reliability of monitoring data. Furthermore, the plug-in design, sealed with rubber gaskets, prevents water from entering the testing box, protecting the sensors and circuitry from damage, extending the lifespan of the equipment, and ensuring the stable operation of the monitoring system. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a schematic diagram of the water extraction device installation.

[0023] Figure 3 This is a schematic diagram of the water quality testing kit.

[0024] Figure 4 This is a schematic diagram of a water extraction device.

[0025] Part numbering in the diagram: 1-Slurry tank; 2-Water extraction device; 3-Peristaltic pump; 4-Water quality testing box; 5-BOD sensor; 6-Weight; 7-Return pipe; 8-Suction pipe; 9-Fine thread; 10-Roller; 11-Bracket; 12-Slurry tank cover; 13-Test box body; 14-Inlet; 15-Sensor; 16-Sensor reserved opening; 17-Waterproof gasket; 18-Outlet; 19-Stepper motor; 20-Wire; 21-Relay. Detailed Implementation

[0026] like Figures 1-4 As shown, this utility model proposes an external online water quality monitoring device for anaerobic fermentation. The device includes a water extraction device 2, a water quality testing box 4, and a BOD sensor 5. The biogas slurry tank 1 has a tank cover 12 with three holes. One end of the extraction pipe 8, the thin wire 9, and the return pipe 7 passes through one of these holes and enters the biogas slurry tank 1, without direct contact with air. The other end of the extraction pipe 8 is connected to the inlet of the peristaltic pump 3, the outlet of the peristaltic pump 3 is connected to the inlet 14 of the water quality testing box 4, the outlet 18 of the water quality testing box 4 is connected to the inlet of the BOD sensor 5, and the outlet of the BOD sensor 5 is connected to the other end of the return pipe 7. A weight 6 is fixed to the side of the end of the extraction pipe 8 that enters the biogas slurry tank 1. One end of the thin wire 9 that enters the biogas slurry tank 1 is connected to the weight 6, and the other end of the thin wire 9 is wound around the roller 10 of the water extraction device 2.

[0027] like Figure 2 , Figure 4 As shown, the water extraction device 2 includes a thin wire 9, a roller 10, a support 11, a stepper motor 19, a wire 20, and a relay 21. The input terminal of the relay 21 is connected to a computer, and the output terminal of the relay 21 is connected to the input terminal of the stepper motor 19 via the wire 20. The stepper motor 19 is mounted on one side of the support 11, and the output terminal of the stepper motor 19 is mounted on the roller 10 on the other side of the support 11. A section of thin wire 9 is wound around the roller 10. In the water extraction device 2, the stepper motor 19 is connected to the roller 10 and controlled by the relay 21. The computer controls the number of rotations of the roller 10 through the relay 21, thereby controlling the position of the inlet of the extraction tube 8.

[0028] A thin thread 9 and a weight 6 are tied to the opening of the extraction pipe 8. The thread 9, through the weight 6, pulls the opening of the extraction pipe 8. When the roller 10 lifts or lowers the thread 9, the position of the opening of the extraction pipe 8 can move up and down accordingly, controlling the lifting and lowering of the opening and its position. The water extraction device 2 controls the position of the opening of the extraction pipe 8 by lifting and lowering the thread 9, and can be controlled by a computer. In addition, a filter screen is installed at the end of the extraction pipe 8 that enters the biogas slurry tank 1 to filter biogas residue; the other end of the extraction pipe 8 is connected to the water quality testing box 4 via a peristaltic pump 3 and a flexible hose.

[0029] like Figure 3 As shown, the water quality testing box 4 includes a testing box body 13, an inlet 14, a sensor 15, a sensor pre-reservation port 16, a waterproof gasket 17, and an outlet 18. The top of the testing box body 13 has three insertion holes. One end of the sensor head of the sensor 15 extends into the testing box body 13 through these insertion holes. The sensor 15 can be a temperature sensor, a pH sensor, or an ORP sensor. The sensors are externally mounted and centrally located within the water quality testing box 4. The sensor pre-reservation port 16 on the top of the testing box body 13 allows for the addition or removal of various types of sensors as needed. Additionally, a waterproof gasket 17 can be provided on the top of the testing box body 13 to seal against leakage, ensuring the inserted sensors are sealed.

[0030] The detection box 13 is equipped with an inlet 14 and an outlet 18. The inlet 14 is connected to the peristaltic pump 3 via a hose, and the outlet 18 is connected to the BOD sensor 5 via a hose. The BOD sensor 5 is a dual-chamber microbial fuel cell (MFC), which consists of two main parts: an anode chamber and a cathode chamber. The anode and cathode chambers are separated by a proton exchange membrane (PEM). Electrical energy is generated through the metabolic activity of microorganisms, thereby indirectly measuring the organic matter content in the water sample. The peristaltic pump 3 slowly draws out the biogas slurry, filling the water quality detection box 4 and the anode chamber of the dual-chamber microbial fuel cell, immersing the detection heads of each sensor. The dual-chamber microbial fuel cell generates electricity, and the BOD value is calculated using a linear relationship curve. After the detection is completed, the measured liquid flows back to the biogas slurry tank 1 through the return pipe 7.

[0031] Example

[0032] In this embodiment, the computer uses relay 21 to rotate roller 10 to lower thin line 9, causing the opening of suction pipe 8 to sink to a designated position. Peristaltic pump 3 then starts working, drawing biogas slurry from biogas slurry tank 1 into the anode chamber of water quality detection box 4 and BOD sensor 5, and finally back into biogas slurry tank 1 through return pipe 7. Once the biogas slurry fills the anode chamber of water quality detection box 4 and BOD sensor 5, the sensor starts working and transmits an electrical signal. This signal is converted by signal acquisition card and transmitted to the computer.

[0033] The results show that this invention organically combines a water extraction device, a water quality testing box, and a BOD sensor to form an external online water quality monitoring device specifically designed for anaerobic fermentation. This device can control the extraction of test liquids at different depths, simultaneously detect multiple parameters, and perform long-term continuous monitoring. It solves the problems of water quality monitoring lag and repetitive manual labor, meeting the water quality monitoring needs of anaerobic fermentation processes in biogas projects. The external water quality testing box facilitates sensor replacement and maintenance, providing strong technical support for the optimization of biogas projects.

Claims

1. An external online water quality monitoring device for anaerobic fermentation, characterized in that, The device includes a water extraction unit, a water quality testing box, and a BOD sensor. The biogas slurry tank cover has three holes. One end of the extraction tube, the thin thread, and the return tube respectively passes through one of the holes and enters the biogas slurry tank. The other end of the extraction tube is connected to the inlet of the peristaltic pump. The outlet of the peristaltic pump is connected to the inlet of the water quality testing box. The outlet of the water quality testing box is connected to the inlet of the BOD sensor. The outlet of the BOD sensor is connected to the other end of the return tube. A weight is fixed to the side of the end of the extraction tube that enters the biogas slurry tank. One end of the thin thread that enters the biogas slurry tank is connected to the weight, and the other end of the thin thread is wound around the roller of the water extraction unit.

2. The external online water quality monitoring device for anaerobic fermentation as described in claim 1, characterized in that, The water extraction device includes a thin wire, a roller, a bracket, a stepper motor, wires, and a relay. The input terminal of the relay is connected to a computer, and the output terminal of the relay is connected to the input terminal of the stepper motor via wires. The stepper motor is mounted on one side of the bracket, and the output terminal of the stepper motor is mounted on the roller on the other side of the bracket. A section of thin wire is wound on the roller.

3. The external online water quality monitoring device for anaerobic fermentation as described in claim 1, characterized in that, A thin thread and a weight are tied to the opening of the suction tube. The thread pulls the opening of the suction tube through the weight. When the roller lifts and releases the thread, the position of the opening of the suction tube moves up and down accordingly, thus controlling the raising, lowering and lowering of the opening of the suction tube and its position.

4. The external online water quality monitoring device for anaerobic fermentation as described in claim 1, characterized in that, A filter screen is installed at one end of the suction pipe that enters the biogas slurry tank, and the other end of the suction pipe is connected to a water quality testing box via a peristaltic pump and a flexible hose.

5. The external online water quality monitoring device for anaerobic fermentation as described in claim 1, characterized in that, The water quality testing kit includes a testing kit body, an inlet, a sensor, and an outlet. The top of the testing kit body has an insertion hole, through which one end of the sensor's detection head extends into the testing kit body. The testing kit body has an inlet and an outlet, with the inlet connected to a peristaltic pump via a flexible tube and the outlet connected to a BOD sensor via a flexible tube.

6. The external online water quality monitoring device for anaerobic fermentation as described in claim 5, characterized in that, The sensors are a temperature sensor, a pH sensor, and an ORP sensor, which are externally mounted and integrated into the water quality testing box.

7. The external online water quality monitoring device for anaerobic fermentation as described in claim 5, characterized in that, A sensor access port is provided at the top of the detection box to add or remove various types of sensors as needed.

8. The external online water quality monitoring device for anaerobic fermentation as described in claim 5, characterized in that, A waterproof gasket is provided on the top of the detection box to seal the inserted sensor.

9. The external online water quality monitoring device for anaerobic fermentation as described in claim 1, characterized in that, The BOD sensor uses a dual-chamber microbial fuel cell.

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