Activated sludge
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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.
Activated sludge tank at Beckton sewage treatment plant, UK. The white bubbles are due to the diffused air aeration system.
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
Secondary treatment
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Secondary treatment is the removal of biodegradable organic matter from sewage or similar kinds of wastewater. The aim is to achieve a certain degree of effluent quality in a sewage treatment plant su
Activated sludge
…wastewaters using aeration and a biological floc composed of bacteria and protozoa. It is one of several biological wastewater treatment alternatives in secondary treatment, which deals with the removal of biodegradable organic matter and suspended solids. It uses air (or oxygen) and microorganisms to biologically oxidize…
This small secondary clarifier at a rural sewage treatment plant is a typical phase separation mechanism to remove biological solids formed in a suspended growth or fixed-film bioreactor.
Constructed wetland in an ecological settlement in Flintenbreite near Lübeck, Germany
Nereda biomass left and activated sludge after only minutes of settling