COD vs BOD



COD (Chemical Oxygen Demand) and BOD (Biological Oxygen Demand) are both measures of the amount of oxygen required to degrade organic matter in water. However, they differ in the way that they measure this oxygen demand and the time frame over which they do so.

BOD measures the amount of oxygen consumed by microorganisms as they break down organic matter in water over a period of 5 days. It is a measure of the amount of biodegradable organic matter present in the water. The BOD test is often used as an indicator of the level of organic pollution in water.

COD, on the other hand, measures the amount of oxygen required to oxidize all the organic matter in water, both biodegradable and non-biodegradable, into carbon dioxide and water. It is a measure of the total organic content in the water, and can include both organic and inorganic compounds. COD testing is often used to monitor the efficiency of wastewater treatment processes, and can be used to determine the amount of chemical oxygen demand that needs to be removed to meet discharge standards.

In summary, BOD measures the amount of oxygen required by microorganisms to break down organic matter over a 5-day period, while COD measures the total amount of oxygen required to fully oxidize all the organic matter in water into carbon dioxide and water.

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