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The activated sludge process is a type of biological wastewater treatment process for ... Two special steps are required for nitrogen removal: ... under construction ...
In most conventional activated sludge processes or aerobic granular reactor, the microorganisms grow in flocs. Flocs are defined as a mass of microorganisms that are held together by slime or fungal filaments, which help with aerobic decomposition and trapping particles (et al. Wilen). [3] Activated sludges are built with two physical separate ...
A generalized schematic of an activated sludge process. Activated sludge is a common suspended-growth method of secondary treatment. Activated sludge plants encompass a variety of mechanisms and processes using dissolved oxygen to promote growth of biological floc that substantially removes organic material.
In comparison, the activated sludge process has a high energy consumption because it includes an aeration step. Some sewage treatment plants produce biogas from their sewage sludge treatment process by using a process called anaerobic digestion. This process can produce enough energy to meet most of the energy needs of the sewage treatment ...
Membrane bioreactors can be used to reduce the footprint of an activated sludge sewage treatment system by removing some of the liquid components of the mixed liquor. This leaves a concentrated waste product that is then treated using the activated sludge process.
The quantity or “age” of sludge within the tank is closely monitored, as this can have a marked effect on the treatment process. The sludge is allowed to settle until clear water is on the top 20 to 30 percent of the tank contents. The decanting stage most commonly involves the slow lowering of a scoop or “trough” into the basin.
In the 1980s the capacity was increased again with the addition of another activated sludge treatment train, using course bubble diffusion. The last expansion occurred in the 1990s when an Modified Ludzack-Ettinger activated sludge train was constructed, bringing the permitted capacity up to 27.5 MGD.
Activated sludge model; Activated sludge systems; Adsorption/Bio-oxidation process; Advanced oxidation process; Aerated lagoon; Aerobic granular reactor