Sludge clumps produced in an aeration tank by the growth of organisms in the presence of dissolved oxygen.
activated sludge loading The unit mass of biological oxygen demand in the applied liquid per unit volume of aeration capacity or per unit mass of activated sludge per day.
activated-sludge process Biological wastewater treatment process that converts nonsettleable (suspended, dissolved, and colloidal solids) organic materials to a settleable product using aerobic and facultative microorganisms.
