An increase in the population of bacteria, especially heterotrophic bacteria that feed on organic waste, leads to higher rates of decomposition. This process requires oxygen, thus increasing the demand for dissolved oxygen in the water. A higher BOD value indicates a larger amount of organic pollution and greater bacterial activity, which can deplete oxygen levels and harm aquatic life.
In a pond ecosystem, the BOD increases due to :
Asked in OPSC CS Prelims 2017 · Topic: Pollution (Water Pollution: Sources, common pollutants, water quality indicators (BOD, COD, DO), effects, control measures.)
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