self-purification

[self-pyoor-uh-fi-key-shuhn]
noun
1.
a natural process of purifying, as the ability of a body of water to rid itself of pollutants.
2.
purification of oneself.

self-purifying, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Occurs in self-purification of water bodies and in activated sludge wastewater
  treatment.
For example, those bacteria which play an active role in stream
  self-purification do perform a useful function.
Besides, high sediment load and turbidity may essentially influence the aquatic
  ecosystem and hence self-purification processes.
The natural process of self-purification may be delayed significantly because
  of the lack of adequate oxygen resources.
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