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== Dissolved Oxygen (DO) == ...nciation: dih-zolved ox-i-gen'') refers to the level of free, non-compound oxygen present in water or other liquids. It is an important parameter in assessin

...condary Treatment''': This involves the removal of dissolved and suspended biological matter. ...emical Oxygen Demand (BOD)]]: Amount of dissolved oxygen needed by aerobic biological organisms to break down organic material present in a given water sample at

...xygen Demand (BOD)]]''' - The amount of dissolved oxygen needed by aerobic biological organisms to break down organic material present in a given water sample at * '''[[Chemical Oxygen Demand (COD)]]''' - The measure of pollutants in wastewater and water samples.

* [[Acute respiratory disease]] - an urgent condition in which oxygen levels in the blood are lower than normal and breathing is difficult ...h the heart and lungs must work harder to meet the body's increased oxygen demand