For the lab-scale studies an AF reactor with a total
liquidvolume of 2 l andan internal diameter of 11.5 cm
was used. The packing media were corrugated plastic
rings of 2.1 cm in length and1.9 cm in height, with a
specific weight of 65 kg/m3
. Two peristaltic pumps were
usedto feedthe wastewaters into the reactor andto
maintain the desired recirculation flow, respectively. The
reactor operatedat 37
C andwas started-up with
biomass collectedfrom an anaerobic pilot plant treating
eucalyptus fibreboardmanufacturing wastewater