Aerobic+and+Anaerobic+Decomposition+of+Organic+Material

= Aerobic and Anaerobic Decomposition of Organic Material =

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 * If there is lots of oxygen present in the water then organic matter will be decomposed aerobically (using oxygen).
 * The products of this are the oxides of the pollutant elements (such as carbon dioxide, water, nitrates, sulfates and phosphates).
 * If there is not much oxygen left in the water then the organic waste will be decomposed anaerobically (without oxygen).
 * These are very smelly and unpleasant gases and these smells characterize polluted stretches of water due to the level of oxygen being very low.