Generally, variations in slaughterhouse wastewater composition are significant, depending on the production procedures, byproducts’ recovery and cleaning procedures (Pozo et al., 2003). The high biochemical oxygen demand (BOD) to chemical oxygen demand (COD) ratio suggests an easily biodegradable wastewater, the relatively low BOD to total Kjeldhal nitrogen (TKN) ratio suggests a need for nitriﬁcation and possibly even nitrogen removal and finally the relatively high total suspended solids (TSS) characterize the slaughterhouses’ wastewater (Chen and Lo, 2003; Lovett et al., 1984). The TKN values are highly dependent on the blood handling process of the slaughterhouse. The concentration of contaminants in slaughterhouses wastewater vary, with COD, TKN and TSS concentration ranging from 1000-20000 mg L-1, 150-10000mg L-1 and 250-5000mg L-1 respectively (Li et al, 2008). For large scale slaughterhouses, on-site biological treatment is recommended by the European Commission to remove organic carbon and nutrients before the wastewater is discharged to surface water or local wastewater treatment plants (EC, 2005). This has forced many industries to treat their wastewater to a level obtainable by implementing the best available technology for wastewater ...
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