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  1. The pollutants which can be decomposed and destroyed by micro- organisms and by natural process are known as Bio-degradable pollutants.
  2. These pollutants are unstable and are recycled.
  3. They provide nutrients and energy in normal conditions by decomposition.
  4. They produce problems like Eutrophication if the input is more than the decomposition and disposal capacity.
  5. Bio-degradable pollutants are mostly nutrients, organic substances of animal and plant origin.
  6. eg. Domestic and human sewage, municipal sewage, Nutrients, Faecal matters, urine, pathogens and organic matters are Bio-degradable pollutants.
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