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| biological wastewater treatment Types of wastewater treatment in which biochemical or bacterial action is intensified to oxidize and stabilize the unstable organic matter present. Examples of this type of treatment use intermittent sand filters, trickling filters, and activated sludge processes and sludge digestion (oczyszczanie ścieków oparte na procesach biochemicznych lub działaniu bakterii w celu utlenienie i ustabilizowania substancji organicznej) | |||