HomeKnowledgeChemicals & substancesAn explanation of Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD)

An explanation of Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD)

BOD and COD: what are they all about?

Chemical Oxygen Demand, or COD, tells us the the size of the total organic pollution. The Biologic Oxygen Demand, or BOD, on the other hand, tells which part of it can actually be removed in the treatment plant.

In this video Strategical Leather Manager, Dirick von Behr, explains Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) and which is best for the environment.

Is a low BOD value better than a high one?

No, definitely not. A BOD value alone, whether it is high or low, tells us nothing. A BOD value only becomes relevant when we relate it to the total pollution of the COD. It is in this relation how we can see how efficiently the treatment plant can handle the incoming pollution. To find this relation we simply divide the BOD by the COD. We call this the BOD/COD ratio and it informs us how much of the food the bacteria in the biological treatment plant can actually digest. Watch the video for more information.

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