The waste and wastewater treatment system and biofilter
design has been previously described by Tsukuda et al. (2015)
(Fig. 2). In short, waste sludge from the production of rainbow
trout (Oncorhynchus mykiss) and Atlantic salmon (Salmo salar), was
concentrated via microscreen drum filters and radial flow settlers
and was pumped to a series of gravity thickening settling cones. A
holding tank for the supernatant overflow from the settling cones
fed the three fluidized denitrification biofilters. Overflow from each
biofilter was treated using a radial flow settler