Abstract

Wastewater coming from slaughterhouses by-products contains high amounts of nitrogen, phosphorus, organic matter, salts, and so on. The effluent comes from the water used to wash the animals, scalding, washing the floor and the machines, cleaning of equipment, etc. Before discharging the effluent in the water body, the effluent needs to be treated. To remove the large amount of organic matter and nutrients this study proposed the use of a combined system composed by three biological reactors: anaerobic, aerobic and anoxic. The best removal efficiencies were 90% for COD and 50% for NH4+-N, what decreases large pollutant potential.

Keywords: Slaughterhouse; Biological treatment; Nutrients removal; Organic matter removal

Abbrevations: PVC: Polyvinyl Chloride; HRT: Hydraulic Retention Time; TP: Total Phosphorous; TKN: Total Kjeldahl Nitrogen; TS: Total Solids; TSS: Total Suspended Solids; VSS: Volatile Suspended Solids