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BOD Determination systems
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BOD (Biochemical Oxygen Demand) measures the amount of oxygen consumed by microorganisms in
decomposing organic matter in wastewater or stream water.
The microorganisms in or inoculated on purpose into a sample of water containing a biodegradable organic
substance consume oxygen owing to their metabolic activity and generate a corresponding volume of carbon dioxide.
When working in a closed system to make the carbon dioxide produced by a highly alkaline substance become absorbed, a progressive reduction of the gas’s pressure is obtain, which can be measured using appropriate manometers.
Today the conventional incubation time at 20°C is considered to be 5 days, and the BOD value obtained is called BOD5.
This corresponds with good reproducibility considering all of the technique’s aspects at 70% of what is called BODlast, which is the complete oxidation value that results in 21-28 days.
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