Organic pollutants

BOD measurementsOrganic pollutants (leaves, dead, carbohydrate, protein) can be decomposed by bacteria water. Bacteria need oxygen to oxidize the organic substances, resulting in levels of dissolved oxygen in the water decreases. A growing number of organic pollutants in waters, the more oxygen is used, the smaller the resulting dissolved oxygen levels.The amount of dissolved oxygen necessary for bacteria to oxidize organic material known as Biological Oxygen Consumption (KOB / COD) or Biological Oxygen Demand, commonly abbreviated as BOD.BOD rate determined by calculating the difference between the initial dissolved oxygen and dissolved oxygen as the water samples stored for 5 days at a temperature of 200C. Therefore completely written BOD205 BOD or BOD5 only.

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3. Biological ParametersIn nature there are animals, plants, and microorganisms that are sensitive and some are resistant to certain environmental conditions. Resistant organisms will remain alive. Water snails and planaria are examples of pollution-sensitive animals. Streams containing water snails and planaria show yet mangalami river pollution. Instead Tubifex worms (red worms) are worms that survive and even thrive in environments rich in organic matter, although other species of animals that have died. This means that the presence of these worms can be used as an indicator of contamination of organic substances. Organisms that can be used as guidance known as biological indicators of pollution.