Biochemical oxygen demand
Biochemical Oxygen Demand (BOD) is a measure of the quantity of oxygen used by microorganisms (e.g., aerobic bacteria) in the oxidation of organic matter.
Introduction[edit | edit source]
Biochemical Oxygen Demand (BOD) is a critical parameter in water quality and waste water treatment, indicating the amount of organic matter present in water. It is defined as the amount of oxygen required by aerobic microorganisms to decompose the organic matter in a sample of water under specific conditions.
Measurement[edit | edit source]
The BOD value is most commonly expressed in milligrams of oxygen consumed per liter of sample during 5 days of incubation at 20 °C and is often used as a surrogate of the degree of organic pollution of water. This method is commonly known as BOD5.
Applications[edit | edit source]
BOD is used as a gauge of the effectiveness of wastewater treatment plants. It is listed as a conventional pollutant in the U.S. Clean Water Act. High BOD levels indicate an abundance of biodegradable material that consumes oxygen as it decays. If the BOD level in water is high, the amount of dissolved oxygen (DO) can decrease to levels that are harmful to aquatic life.
Factors Affecting BOD[edit | edit source]
Several factors can influence BOD levels. These include temperature, pH, the presence of certain kinds of microorganisms, and the type of organic and inorganic material in the water.
See Also[edit | edit source]
References[edit | edit source]
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