COD (Chemical Oxygen Demand) refers to the chemical oxygen demand, which is usually a parameter in indicator chemistry that reflects the degree of organic pollution. The traditional COD detection method requires a long time and is complex to operate, while the COD online analyzer can achieve automatic continuous detection. The working principle of COD online analyzer is to convert COD in the sample into detectable compounds through chemical methods, and then use the principle of photoelectric colorimetry to determine COD concentration. 1. The structure of COD online analyzer: COD online analyzer mainly consists of sample storage, reagent storage, reactor, stirrer, colorimetric cell, optical system, spectrophotometer, computer and other parts. The sample storage is the place where the sample to be tested is kept, while the reagent storage is used to store reagents. The reactor is the place where the sample to be tested and the reagent are mixed and reacted. The reacted liquid will be stirred by a stirrer and reach the colorimetric cell, and then detected by a spectrophotometer. Finally, the data will be transmitted to the computer for real-time monitoring and information storage. 2. Working principle of COD online analyzer
The working principle of COD online analyzer is mainly to react COD in the sample into detectable colored compounds, and then use photoelectric colorimetric method for determination. The general COD analysis work mainly includes the following six steps:
(1) Control the flow rate of the sample solution and the sampling flow rate.
(2) The sample is introduced into the sample storage container through the injection port, and then the reagent is injected into the reactor from the reagent storage container. The internal stirrer in the reactor will stir the sample and reagent to fully react.
(3) After the reaction, the liquid is filtered and stirred evenly, and then reaches the colorimetric cell for measurement at certain intervals. The entire reaction process is automated.
(4) The colorimetric cell is used to determine the color depth of the liquid after the reaction, thereby reflecting the COD concentration.
(5) For the measured data, the COD online analyzer can compare the measurement results with the preset set values, thereby reminding users whether they need to find solutions for water quality impact.
(6) The COD online analyzer also has functions such as real-time data transmission, data storage, and recording, which can be widely used in the management, analysis, and prevention of water pollution.
3. Application of COD online analyzer
The application of COD online analyzer is very extensive, playing an extremely important role in industries such as sewage treatment, drinking water monitoring, waste gas treatment, and industrial chemical production. For example, in the process of drinking water treatment, COD online analyzer can monitor the content of toxic and harmful substances in the water, ensuring that the water quality meets national safety standards; In the field of wastewater treatment, COD online analyzers can be used for automatic detection, data storage, calculation, and control of COD, creating more efficient and energy-saving wastewater treatment solutions; In the production of chemical industrial products, COD online analyzers can also monitor any chemical substances that may cause harm to water quality during the production process.
COD online analyzer is very important for ensuring water quality safety and promoting the development of environmental protection industry. Nowadays, it has become a powerful tool for water quality detection and control. In the future, the application areas of COD online analyzers will become increasingly widespread, playing an increasingly important role in promoting environmental protection and improving people's quality of life.
