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Activated Sludge Process(ASP)

Activated Sludge Process refers to a multi-chamber reactor unit that makes use of highly concentrated microorganisms todegrade organics andremove nutrients from wastewar to produce a high-quality effluent. To maintain aerobic conditions and to keep the activated sludge suspended, a continuous and well-timed supply of oxygen is required.

Activated sludge consists of flocs of bacteria, which are suspended and mixed with wastewater in an aerated tank. The bacteria use the organic pollutants to grow and transform it to energy, water, CO2 and new cell material. Activated sludge systems are suspended-growth type and are used in conventional high-tech wastewater treatment plants to treat almost every wastewater influent as long as it is biodegradable.


The Activated Sludge Process (ASP) is a sewage treatment process in which air or oxygen is blown into raw, unsettled sewage to smash the solids and develop a biological 'soup' which digests the organic content and pollutants in the sewage. These plants do not have a primary settlement chamber which is the chamber that needs emptying by tanker on a regular basis with most three stage sewage treatment plants.

In all activated sludge plants, once the sewage has been 'bubbled' long enough, excess sewage liquor is discharged into a clarification chamber where live bacteria settle to the bottom, dead bacteria rise to the top and form a crust with a clear liquid in the middle. This clean water is then discharged into either a watercouse.


  • High effluent quality
  • Very reliable & Simple process
  • High nutrient removal possible
  • Longer emptying intervals
  • Less 'bad' sludge to remove
  • High reduction of BOD and pathogens at after secondary treatment

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