What Sihh Dissolved Oxygen That??
Ok The Explanation Please Refer To Below
The water contains dissolved oxygen which comes from the air and from the results of fotosintetis aquatic plants. The oxygen required by the living beings in the water, such as fish, shrimp, shellfish, including bacteria. Dissolved oxygen levels when there are less than 5 ppm (part persejuta) oxygen, then the fish will die, while bacteria that require oxygen levels lower than 5 ppm will thrive. Bacteria living from organic ingredients. Aerobic bacteria help mengoksidasikan of carbon and nitrogen in organic materials into carbon dioxide and water.
If the water contains a lot of organic material, then aerobic bacteria in it will thrive and dissolved oxygen levels will be reduced quickly so that it can result in the death of fish and shrimp. The decomposition of organic waste by anaerobic bacteria do next i.e. bacteria that do not require free oxygen. Anaerobic bacteria capable of the reduction of carbon, nitrogen, and sulfur from the organic matter into methane (CH4), ammonia (NH3), sulfur and acid (H2S). NH3 and H2S gas smell foul resulting in a got heavy polluted river or unpleasant smells (foul).
Biochemical Oxygen Requirement (Biochemical Oxygen Demand BOD/
Biochemical oxygen requirement (BOD) is a measure of the number of bacterial oxygen that is used to perform the oxidation reactions. The more organic material in the water, the greater will be the level of BOD and the lower levels DO. Water can be referred to as the clean water if the BOD levels less than 1 ppm.
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