Biological nutrient removal-trickling filter systems
The application of newer high-rate nitrifying trickling
filter (NTF) systems to slaughterhouse or
rendering-plant systems has not been reported. A
major consideration is that the process does not
achieve denitrification, but only ammonia removal
by conversion to nitrate. A number of denitrifying
filter systems have emerged in recent years to solve
this problem. Parker et al. (1990) reported high rates
of nitrification of domestic wastewater (about 3 gN/
m2.day at 20°C) using new, cross-flow packing
media. Volumetric nitrification rates (0.2-0-4 gN/
m3.day at 20°C) were similar to those of other
processes (activated sludge, submerged filter), but
costs were claimed to be lower