An independent rendering plant will produce quite different wastewater to that of an integrated slaughterhouse (Metzner & Temper, 1990; Cooper & Russell, 1988), since the condensed rendering vapours are the major pollution load. these are high in BOD and nitrogen concentrations, largely as ammomia, 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 extentive degradation of raw material in summer, which boosts of ammonia nitrogen.
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