Avaliação da eficiência de remoção de nitrogênio amoniacal do efluente de frigorífico de suínos

Abstract

The expansion of swine farming in Brazil has generated some environmental prob lems related mainly to the generation of liquid effluent, from the slaughter of the ani mal to the processing of its meat. More and more studies are needed to improve the form of treatment and to improve treatments already in place. Therefore, it was nec essary to carry out this study, in order to evaluate the effects of airflow and cycle time on the efficiency of the ammonia nitrogen re-motive process of the liquid effluent from the swine slaughterhouse. Effluent samples from a swine slaughterhouse located in the western region of Paraná were used in the study. Effluent was collected at the exit of the anaerobic lagoon 2, installed in the industrial unit, which was frozen at -2,2 ° C until the moment of use. The effluent was previously characterized by the analy sis of the parameters COD, ammoniacal nitrogen, total alkalinity, pH. The effects o airflow and cycle time on the efficiency of ammonia nitrogen removal were evaluated using a Central Compound Design (CCD), composed of 7 experimental tests. Was generated a mathematical model usable for the simulation of future scenarios. Based on the results obtained, it was observed that a large air flow and cycle time were not required for the removal of ammoniacal nitrogen from the effluent from a slaughter house. With the study it was possible to understand that there is a high efficiency o removal of ammoniacal nitrogen using more restricted and less restricted conditions of cycle time and airflow.