Activated Sludge Process
A wastewater treatment process which speeds up the decomposition of wastes in the wastewater being treated. Activated sludge, a mixture of Protozoa (single-celled microorganisms) and Metazoa (multi-celled microorganisms), is added to the wastewater and the mixture is aerated and agitated. The microorganisms rapidly breakdown wastes as food until there is not enough food and microorganisms begin to die off. The microorganisms are removed from the water by settling in the secondary clarifier and a portion of them are returned the begin to process again.