It is not plain which process variant best suits
slaughterhouse operation. For example, the
Dutch have used both sequencing-batch and
continuous plants for nutrient removal in animal
manure slurries (Willers et al., 1993).
(ii) It would appear that relatively little is known
about denitrification of slaughterhouse wastewater
(Frose & Kayser, 1985). Biological
denitrification requires the availability of
readily degradable carbon. Therefore, prior
anaerobic removal of COD from slaughterhouse
wastewater (in anaerobic ponds or
high-rate systems), which is common in the
meat industry, must be carefully balanced
against this requirement if successful denitrification
is to be obtained without the highly
expensive use of external carbon sources.
These are probably unnecessary for slaughterhouse
wastewater. Metzner and Temper
(1990) describe the use of an anaerobic filter
which preceded a BNR plant which achieved
nitrogen removal. Carbon for denitrification
was provided by a 14% volume raw effluent
bypass of the anaerobic reactor