& Russell, 1988), since the condensed rendering
vapours are the major pollution load. These are high
in BOD and nitrogen concentrations, largely as
ammonia, but poor in phosphorus, in contrast to
slaughterhouse wastewater (Frose & Kayser, 1985).
The ammonia nitrogen concentration may vary significantly
between winter and summer, due to the
more extensive degradation of raw material in summer,
which boosts levels of ammonia nitrogen
& Russell, 1988), since the condensed renderingvapours are the major pollution load. These are highin BOD and nitrogen concentrations, largely asammonia, but poor in phosphorus, in contrast toslaughterhouse wastewater (Frose & Kayser, 1985).The ammonia nitrogen concentration may vary significantlybetween winter and summer, due to themore extensive degradation of raw material in summer,which boosts levels of ammonia nitrogen
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