Activated sludge is a solid/soft matter utilized for eradicating contaminants from wastewater by a biological response that includes oxygen. The activated sludge is simultaneously parted from the treated effluent and discharged from or brought back to the processes when needed.

Activated sludge is an oxygen-dependent biological process that serves to convert soluble organic matter to solid biomass, that is removable by gravity or filtration. It arises from the activation of sludge or the accumulation of bacteria in basins or tanks, which combines with incoming wastewater and the combination becomes exposed to oxygen for hours. It is understood that the concentrated biological substances, along with the reduced liquid holding duration as compared to the solids holding duration.

What is the purpose of activated sludge?

The purpose of activated sludge is in the following:

  • Generating biological matter that settle easily
  • Producing fluids that contain minimal suspended or dissolved solids
  • Eradicating phosphate
  • Oxidizing biological substances
  • Oxidizing biological materials such as nitrogen and ammonium
  • Removing unwanted gases such as ammonia, nitrogen, and CO2