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To oxygenate or allow air to penetrate something. This process is used to promote biological degradation of organic matter in water, by exposing it to air. The process may be passive (when waste is simply exposed to air), or active (when a mixing or bubbling device introduces the air into the liquid, generating bubbles and aerosols that lead to the release of the dissolved gases). See also diffused air.

Subjects: Environmental Science.

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