What is Biological Oxygen Demand (BOD)?
The amount of oxygen needed by bacteria and other microorganisms to break down organic matter in an aerobic environment is known as the biochemical oxygen demand.
Oxygen is present in the typical lake or stream in trace amounts as dissolved oxygen (DO). The aquatic life and aesthetic value of streams and lakes are both maintained by dissolved oxygen, which is an essential component of natural water bodies.
Biochemical oxygen demand is a measurement of the decomposition of organic materials in water. However, there are a number of human-caused and environmental variables that might reduce the amount of dissolved oxygen in a body of water.
Source Of BOD
Leaf and woody debris, dead plants and animals, animal dung, effluents from pulp and paper mills, wastewater treatment facilities, feedlots, and food-processing factories, malfunctioning septic systems, and urban storm water runoff are all sources of biological oxygen demand.
How is BOD used in wastewater treatment plants?
In wastewater treatment facilities, biological oxygen demand is frequently employed as a gauge of the level of organic pollution in the water.
Strict limitations on BOD levels apply to industries that discharge wastewater into municipal sanitary sewers or rivers. Organic and/or inorganic elements and organisms can make up the solids in wastewater, which must be greatly decreased during treatment in order to prevent a rise in BOD after discharge.
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