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What is the relationship between COD and BOD?
In the sewage treatment process, there are hundreds of organic substances, and analyzing these organic substances one by one takes time and medicine. After research, it is found that all organic substances have two things in common. One is that they are all composed of hydrocarbons. The other is that most organic substances can be chemically oxidized or oxidized by microorganisms. Their carbon and hydrogen form non-toxic with oxygen. Harmless carbon dioxide and water. The organic matter in sewage consumes oxygen both in the chemical oxidation process or in the biological oxidation process. The more organic matter in the wastewater, the more oxygen is consumed. There is a direct proportional relationship between the two. Therefore, the amount of oxygen consumed by chemical oxidation of sewage is called COD (Chemical Oxygen Demand), and the amount of oxygen consumed by the oxidation of microorganisms in sewage is called BOD (Oxygen Demand for Gas).
Since COD (Chemical Oxygen Demand) and BOD (Oxygen Demand for Gas) can comprehensively reflect the quantity of all organic substances in the water, there are also many such detection instruments, the detection method is simple, and the detection results can be obtained in a short time. Therefore, it is widely used in water quality detection and analysis, and it has become an important indicator of water quality monitoring and an important basis for environmental monitoring of water bodies. We have heard comparisons in sewage treatment.
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