Settling tank (usually referred to as 'final clarifier' or 'secondary settling tank') to allow the biological flocs (the sludge blanket) to settle, thus separating the biological sludge from the clear treated water.Aeration tank where air (or oxygen) is injected in the mixed liquor.The general arrangement of an activated sludge process for removing carbonaceous pollution includes the following items: It thereby produces a liquid that is relatively free from suspended solids and organic material, and flocculated particles that will readily settle out and can be removed. The process takes advantage of aerobic micro-organisms that can digest organic matter in sewage, and clump together by flocculation entrapping fine particulate matter as they do so.

The activated sludge process is a biological process used to oxidise carbonaceous biological matter, oxidising nitrogenous matter (mainly ammonium and nitrogen) in biological matter, and removing nutrients (nitrogen and phosphorus). Activated sludge addition (seeding) to a pilot scale membrane bioreactor in Germany Activated sludge under the microscope Aerial photo of Kuryanovo wastewater treatment plant in Moscow, Russia Purpose A generalized, schematic diagram of an activated sludge process. A new development of the activated sludge process is the Nereda process which produces a granular sludge that settles very well. Treating sludge bulking and managing the plant to avoid a recurrence requires skilled management and may require full-time staffing of a works to allow immediate intervention. Sludge bulking can occur which makes activated sludge difficult to settle and frequently has an adverse impact on final effluent quality. Aeration methods include diffused aeration, surface aerators (cones) or, rarely, pure oxygen aeration. Plant types include package plants, oxidation ditch, deep shaft/vertical treatment, surface-aerated basins, and sequencing batch reactors (SBRs). Part of the waste sludge is recycled to the aeration tank and the remaining waste sludge is removed for further treatment and ultimate disposal. This is followed by a settling tank to allow the biological flocs (the sludge blanket) to settle, thus separating the biological sludge from the clear treated water.

The activated sludge process for removing carbonaceous pollution begins with an aeration tank where air (or oxygen) is injected into the waste water. It uses air (or oxygen) and microorganisms to biologically oxidize organic pollutants, producing a waste sludge (or floc) containing the oxidized material. The activated sludge process is a type of biological wastewater treatment process for treating sewage or industrial wastewaters using aeration and a biological floc composed of bacteria and protozoa. The white bubbles are due to the diffused air aeration system. Wastewater treatment process using aeration and a biological floc Activated sludge tank at Beckton sewage treatment plant, UK.

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