Trickling filters offer well-known and widely
applied technical solutions to treat wastewaters of
different sources and compositions. Their main
purpose is to provide nitrification and removal of
Biochemical Oxygen Demand (BOD) [1]. Treatment
capacity is related to the total surface of the
filter medium, providing area for bacterial growth.
As each filter medium has a specific index of
area per volume, the treatment capacity can be indi-
*Corresponding author. cated as mass removal per volume per time.