What does $B O D_{5}$ represent?

Biological oxygen demand in five days

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Dissolved oxygem left after five days

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Dissolved oxygen consumed in five days

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Microorganisms killed by ozone in sewage treatment plants in five hours

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Solution

The correct option is A Biological oxygen demand in five days
$B O D_{5}$ stands for 5-day Biochemical Oxygen Demand. The BOD test measures, oxygen is used as microbes breathe as they eat the contaminants in wastewater.

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