What is BOD?

BOD is the biochemical oxygen demand (Biochemical Oxygen Demand), also known as biochemical oxygen consumption, which is a comprehensive indicator of the content of oxygen-demanding pollutants in water and is widely used in environmental engineering and other fields. The following is a detailed introduction for you:


Definition

Biochemical oxygen demand refers to the amount of dissolved oxygen consumed in the biochemical reaction of microorganisms decomposing biodegradable organic matter in water under certain conditions, expressed in mg/L or percentage, ppm.

Significance

It is a comprehensive indicator reflecting the content of organic pollutants in water. The higher the BOD value, the more organic pollutants there are in the water body and the worse the water quality. It also reflects the degradation rate of organic matter in the water body and the self-purification capacity of the water body.


Differences from other indicators

Different from COD (Chemical Oxygen Demand), COD uses chemical methods to measure the amount of reducing substances in water samples that need to be oxidized. Under certain conditions, the amount of oxidant consumed to oxidize the reducing substances in one liter of water sample is used as an indicator, converted into milligrams of oxygen required for each liter of water sample to be completely oxidized, expressed in mg/L. It reflects the degree of pollution by reducing substances in water. This indicator is also used as one of the comprehensive indicators of the relative content of organic matter.

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