11 Facts About Activated sludge

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.

Part of the waste Activated sludge is recycled to the aeration tank and the remaining waste Activated sludge is removed for further treatment and ultimate disposal.

Part of the settled material, the Activated sludge, is returned to the head of the aeration system to re-seed the new wastewater entering the tank.

Activated sludge is the name given to the active biological material produced by activated sludge plants.

Excess sludge is called "surplus activated sludge" or "waste activated sludge" and is removed from the treatment process to keep the ratio of biomass to food supplied in the wastewater in balance.

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Amount of sewage sludge produced from the activated sludge process is directly proportional to the amount of wastewater treated.

The rising oxygen and injected return Activated sludge provide the physical mechanism for mixing of the sewage and Activated sludge.

New development of the activated sludge process is the Nereda process which produces a granular sludge that settles very well .

Activated sludge process is an example for a more high-tech, energy intensive or "mechanized" process that is relatively expensive compared to some other wastewater treatment systems.

Activated sludge plants are wholly dependent on an electrical supply to power the aerators to transfer settled solids back to the aeration tank inlet, and in many cases to pump waste sludge and final effluent.

Activated sludge process was discovered in 1913 in the United Kingdom by two engineers, Edward Ardern and W T Lockett, who were conducting research for the Manchester Corporation Rivers Department at Davyhulme Sewage Works.