A laboratory device for measuring biochemical oxygen demand in water.

Abstract

This utility model discloses a laboratory device for measuring the biochemical oxygen demand (BOD) of water, including a reaction container. The reaction container has a top cover and a drain outlet at its bottom. A stirring motor is located in the middle of the upper part of the top cover, and an inlet pipe is installed on the upper part of the top cover next to the stirring motor. A control box is located on one side of the reaction container. An oxygen sensor is located at the lower end of a temperature control module. Aerators are also embedded on both sides of the drain outlet at the bottom of the reaction container. The device offers rapid and timely measurement: Real-time monitoring of dissolved oxygen concentration changes using an oxygen sensor, combined with an efficient data acquisition and processing module, allows for rapid calculation of the BOD value, significantly shortening the measurement time. The device provides accurate and reliable results: A high-precision temperature control module, an accurate oxygen sensor, and a scientific data processing algorithm together ensure the accuracy and reliability of the measurement results.

Description

Technical Field

[0001] This utility model relates to the technical field of water quality testing equipment, specifically a laboratory device for measuring biochemical oxygen demand in water. Background Technology

[0002] Biochemical oxygen demand (BOD) is a key indicator for measuring the content of organic pollutants in water bodies and is of great significance in assessing the degree of water pollution. Traditional BOD determination often employs the dilution method, which has several drawbacks. The procedure is complex, requiring a high level of professional skill and operational proficiency from the laboratory personnel; the measurement time is lengthy, often taking several days from sample preparation to obtaining the final result; and the measurement process is highly susceptible to interference from external environmental factors, such as temperature fluctuations and airborne impurities, leading to unreliable results. These problems severely restrict the efficient implementation of water quality monitoring. Therefore, the development of a novel laboratory BOD measuring device is urgently needed. Thus, those skilled in the art provide a laboratory-grade biochemical oxygen demand measuring device for water quality to address the problems mentioned in the background section. Utility Model Content

[0003] The purpose of this invention is to provide a laboratory device for measuring biochemical oxygen demand in water, in order to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A laboratory water biochemical oxygen demand (BOD) measuring device includes a reaction vessel. The reaction vessel has a top cover at its upper end and a drain outlet at its bottom. A stirring motor is located in the middle of the upper part of the top cover, and an inlet pipe is installed on the upper part of the top cover near the stirring motor. A control box is located on one side of the reaction vessel, and a temperature control module is located below the control box on the same side. An oxygen sensor is located at the lower end of the temperature control module. An LCD screen is embedded in the front surface of the control box, and a data acquisition and analysis box is located at the lower end of the control box. Aerators are also embedded in both sides of the drain outlet at the bottom of the reaction vessel.

[0006] As a further improvement of this utility model: the upper end of the reaction container is fixedly connected to the upper cover by a fixing buckle, and the lower end of the reaction container is provided with a support leg.

[0007] As a further improvement of this utility model, a liquid pump is installed at the lower end of the liquid inlet pipe.

[0008] As a further embodiment of this utility model: a stirring rod is connected to the lower end of the stirring motor and located inside the reaction vessel, and short blades and long blades are installed on the stirring rod, with the short blades and long blades arranged alternately.

[0009] As a further improvement of this utility model: the acquisition and analysis box is equipped with a processing chip for calculating the BOD value, and the acquisition and analysis box is electrically connected to the stirring motor, temperature sensor, oxygen sensor, electric heater and aerator respectively.

[0010] As a further improvement of this utility model: the temperature control module includes a temperature sensor and an electric heater, and the electric heater is provided at the lower end of the temperature sensor.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] Simple and efficient operation: The design of the automatic sample introduction system and touch screen control panel greatly simplifies the experimental operation process, reduces manual operation steps, and effectively improves experimental efficiency.

[0013] Rapid and timely measurement: By using an oxygen sensor to monitor changes in dissolved oxygen concentration in real time, and with the help of an efficient data acquisition and processing module, the BOD value can be calculated quickly, significantly shortening the measurement time.

[0014] The results are accurate and reliable: a high-precision temperature control module, an accurate oxygen sensor, and a scientific data processing algorithm work together to ensure the accuracy and reliability of the measurement results.

[0015] High degree of automation: From sample injection to data acquisition, processing and display, the entire process is automated, which effectively reduces the interference of human factors on experimental results and improves the repeatability and comparability of experiments.

[0016] Aeration performance optimization: The addition of the aeration device module makes the dissolved oxygen distribution in the water sample more uniform, significantly improves the activity of microorganisms, further optimizes the BOD measurement results, and enhances the performance of the device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a laboratory device for measuring biochemical oxygen demand in water.

[0018] Figure 2 This is a schematic diagram of the installation structure of an aerator in a laboratory water quality biochemical oxygen demand (BOD) measuring device.

[0019] In the diagram: 1. Reaction vessel; 2. Fixing buckle; 3. Top cover; 4. Liquid pump; 5. Liquid inlet pipe; 6. Stirring motor; 7. Control box; 8. LCD screen; 9. Data acquisition and analysis box; 10. Temperature sensor; 11. Oxygen sensor; 12. Electric heater; 13. Drain port; 14. Support leg; 15. Stirring rod; 16. Short blade; 17. Long blade; 18. Aerator. Detailed Implementation

[0020] Please see Figures 1-2 In this embodiment of the invention, a laboratory water biochemical oxygen demand (BOD) measuring device is provided. The reaction container 1 is a core component, made of transparent material to facilitate observation of the water sample status by laboratory personnel. Its upper end is connected to a cover 3 via a fixing buckle 2, a connection method that facilitates disassembly and cleaning. A drain port 13 is provided at the bottom for discharging the measured water sample. Support legs 14 at the lower end provide stable support for the device.

[0021] The upper cover 3 has an inlet pipe 5 installed on one side of the upper end. The lower end of the inlet pipe 5 is equipped with a pump 4, which can quickly and conveniently draw the water sample to be tested into the reaction container 1. It can accurately control the amount of water sample and microbial agent injected, effectively reduce the error caused by manual operation, and improve the accuracy and repeatability of the experiment.

[0022] A stirring motor 6 is installed in the middle of the upper part of the cover 3, and its lower end is connected to a stirring rod 15 inside the reaction vessel 1. Short blades 16 and long blades 17 are alternately arranged on the stirring rod 15. When the stirring motor 6 is running, the long and short blades work together to create a complex stirring flow field in the reaction vessel, ensuring uniform mixing. The stirring speed can be flexibly adjusted according to experimental needs, thereby ensuring full contact between the water sample and the microbial agent and promoting efficient biochemical reaction.

[0023] The temperature control module consists of an electric heater 12 and a temperature sensor 10. The temperature sensor 10 is a PT100, which has a high-precision temperature control capability of ±0.5℃, creating a stable constant temperature environment for the reaction vessel 1 and maintaining the activity and stability of microorganisms.

[0024] The oxygen sensor 11 uses a Clark-type dissolved oxygen sensor, an electrochemical sensor. Its measurement range is 0-20 mg / L, response time ≤30 seconds, measurement accuracy up to ±0.1 mg / L, and it exhibits good stability. An integrated temperature sensor enables automatic temperature compensation, and its service life is typically 1-2 years. The sensor mainly consists of a platinum or gold cathode, a silver or silver / silver chloride anode, a potassium chloride electrolyte solution, a polytetrafluoroethylene or polyethylene breathable membrane, and a corrosion-resistant housing. During operation, dissolved oxygen in the water sample permeates through the breathable membrane, undergoing a reduction reaction at the cathode and an oxidation reaction at the anode, generating a current signal proportional to the dissolved oxygen concentration. The dissolved oxygen concentration is calculated by measuring this current signal.

[0025] A control box 7 is installed on one side of the reaction vessel 1, with an embedded LCD screen 8 on its front surface, clearly displaying key data such as dissolved oxygen concentration, BOD value, and temperature, facilitating researchers' observation and recording of experimental information at any time. A data acquisition and analysis box 9 is located at the lower end of the control box 7, containing a processing chip connected to an oxygen sensor. It can calculate the BOD value based on the acquired data, performing in-depth analysis of dissolved oxygen data in real time, quickly and accurately calculating the BOD value, and displaying it in real time. A temperature control module is located on one side of the reaction vessel 1, below the control box 7, consisting of a temperature sensor 10 and an electric heater 12. The temperature sensor 10 monitors the water sample temperature in real time, and the electric heater 12 heats as needed. An oxygen sensor 11 is located at the lower end of the temperature control module to monitor the dissolved oxygen content in the water sample. The data acquisition and analysis box 9 is electrically connected to the stirring motor 6, temperature sensor 10, oxygen sensor 11, electric heater 12, and aerator 18, enabling intelligent control and data acquisition of each component.

[0026] Aerators 18 are embedded on both sides of the bottom drain port 13 of the reaction vessel 1, which can continuously introduce air into the water sample to provide sufficient oxygen for microorganisms to decompose organic matter, ensuring the accuracy of the measurement process. The uniform introduction of air or oxygen into the reaction vessel ensures the uniform distribution of dissolved oxygen in the water sample, enhances microbial activity, and optimizes the measurement results.

[0027] When in use, place the device stably, install the top cover 3 through the fixing buckle 2, and connect the liquid inlet pipe 5, liquid pump 4 and other components to ensure that the connection of each component is firm and the circuit is normal.

[0028] Water sample addition: Place the water sample to be tested in a suitable position, and start the pump 4 on the control box 7. The water sample is drawn into the reaction vessel 1 through the inlet pipe 5.

[0029] Parameter settings: Set operating parameters such as temperature and stirring speed on the LCD screen 8, and the data acquisition and analysis box 9 controls the operation of each component according to the set parameters.

[0030] Measurement process: The stirring motor 6 drives the stirring rod 15 to rotate, and the long and short blades stir the water sample; the temperature sensor 10 monitors the temperature in real time. If the temperature is lower than the set value, the electric heater 12 automatically starts heating; the aerator 18 continuously aerates the water, and the oxygen sensor 11 monitors the dissolved oxygen content in real time and transmits the data to the data acquisition and analysis box 9.

[0031] Data processing and result output: The processing chip in the data acquisition and analysis box 9 calculates the BOD value based on the data collected by the temperature sensor 10 and the oxygen sensor 11, and displays the result on the LCD screen 8.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A laboratory apparatus for measuring biochemical oxygen demand (BOD) in water, comprising a reaction vessel (1), characterized in that, The upper end of the reaction container (1) is provided with a top cover (3), and the bottom of the reaction container (1) is provided with a drain port (13). The upper middle part of the top cover (3) is provided with a stirring motor (6), and the upper end of the top cover (3) is located on one side of the stirring motor (6) with a liquid inlet pipe (5). The side of the reaction container (1) is provided with a control box (7), and the side of the reaction container (1) located below the control box (7) is provided with a temperature control module. The lower end of the temperature control module is provided with an oxygen sensor (11). The front surface of the control box (7) is embedded with an LCD screen (8), and the lower end of the control box (7) is provided with a data acquisition and analysis box (9). The bottom of the reaction container (1) is also embedded with aerators (18) on both sides of the drain port (13).

2. The laboratory water biochemical oxygen demand (BOD) measuring device according to claim 1, characterized in that, The upper end of the reaction container (1) is fixedly connected to the upper cover (3) by a fixing buckle (2), and the lower end of the reaction container (1) is provided with a support leg (14).

3. The laboratory water biochemical oxygen demand (BOD) measuring device according to claim 1, characterized in that, A liquid pump (4) is installed at the lower end of the liquid inlet pipe (5).

4. The laboratory water biochemical oxygen demand (BOD) measuring device according to claim 1, characterized in that, A stirring rod (15) is connected to the lower end of the stirring motor (6) and inside the reaction vessel (1). The stirring rod (15) is equipped with short blades (16) and long blades (17), which are arranged alternately.

5. A laboratory water biochemical oxygen demand (BOD) measuring device according to claim 1, characterized in that, The acquisition and analysis box (9) is equipped with a processing chip for calculating BOD value. The acquisition and analysis box (9) is electrically connected to the stirring motor (6), temperature sensor (10), oxygen sensor (11), electric heater (12) and aerator (18).

6. The laboratory water biochemical oxygen demand (BOD) measuring device according to claim 1, characterized in that, The temperature control module includes a temperature sensor (10) and an electric heater (12), with the electric heater (12) provided at the lower end of the temperature sensor (10).

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