Composition of fish filleting wastewater

The first step in pollution control is the characterization of the effluent. This work intends to be a contribution to the knowledge of fishery effluents and to give information necessary for wastewater treatment. Analyses for temperature, pH, settleable matter, total residue, grease and oil, phosphate, total Kjeldahl nitrogen, ammonia, nitrate, nitrite, BOD} and COD were performed. Data were statistically analysed. It was concluded that the operational policy had a decisive influence on the composition of the wastewater. Moreover, seasonal variation, which could be correlated to raw material seasonal changes, was detected for grease and oil.