ery may increase wastewater concentrations of
nitrogen, sulphide, COD and fat considerably (Table
2).
Care is also required in interpreting concentration
data, since the processes described are not always
similar, the animal type and size varies widely and
concentrations are inevitably influenced by water
consumption. The best basis for expressing and comparing
pollution output and water use is the use of
an Equivalent Dressed Carcass Weight, since comparison
of data between mixed species facilities and
animals of different carcass weights is then possible.
Unfortunately, data are rarely published in this form
and the latest published figures remain those of
Witherow, 1973 (Table 3).
Table 2. Screened fellmongery effluent characteristics
(Cooper & Russell, 1988)
Parameter Slaughterhouse Fellmongery
(mg/1) wastewater wastewater
COD 1680 14 100
TKN 130 1370
O&G 145