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Activated sludge tank at Beckton sewage treatment plant, UK.The white bubbles are due to the diffused air aeration system. 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.
Candidatus Microthrix, identified in more than one EBPR activated sludge source, is a filamentous bacteria suspected to be responsible for phosphate removal during the bulking phase of EBPR, where other PAOs decrease in abundance. [28]
The tube on the left shows typical floc formations in an otherwise clear culture of a bacterium, Zoogloea resiniphila, isolated from an activated sludge wastewater treatment reactor. In the tube on the right, planktonic growth by a floc-impaired mutant results in a turbid appearance.
In comparison to conventional activated sludge process treatments which typically achieve 95 percent removal, removal can be increased to 96 to 99 percent in membrane bioreactors (see table, [21]). Chemical oxygen demand ( COD ) and biological oxygen demand ( BOD5 ) removal is found to increase with mixed liquor suspended solids concentration.
Proponents of aerobic granular sludge technology claim "it will play an important role as an innovative technology alternative to the present activated sludge process in industrial and municipal wastewater treatment in the near future" [1] and that it "can be readily established and profitably used in activated sludge plants". [2]
Enhanced biological phosphorus removal (EBPR) is a sewage treatment configuration applied to activated sludge systems for the removal of phosphate. [1]The common element in EBPR implementations is the presence of an anaerobic tank (nitrate and oxygen are absent) prior to the aeration tank.
Activated sludge systems are generally based on microorganisms like bacteria, protozoa, nematodes, rotifers, and fungi, which are capable of degrading biodegradable organic matter. There are many positive outcomes from the use of bioaugmentation, such as the improvement in efficiency and speed of the process of breaking down substances and the ...
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. It is one of several biological wastewater treatment alternatives in secondary treatment , which deals with the removal of biodegradable organic ...