Biotechnology and Bioinformatics (1+1)

6.2.4. Characteristics of real biofilters

6.2.4. 1. Activated sludge systems

· Activated sludge is defined as a suspension of microorganisms, both living and dead, in a wastewater.

· Activated sludge systems are not common in aquaculture systems.

· Air is pumped into the basin to supply oxygen and mixing.

· Pure oxygen may be supplied as an alternative to air but supplemental mixing is required.

· Activated sludge systems are good at removing carbonaceous BOD in systems with high nutrient loadings.

· They are commonly used in domestic waste water treatment systems.

· Activated sludge systems are typically expensive to operate and do not provide the effluent water quality necessary for aquaculture.