Comparação da eficiência de lagoas de estabilização e biodigestores no manejo e tratamento de dejetos em empreendimentos da suinocultura no município de Toledo – PR

Abstract

As the expansion of the swine sector occurs, the amount of residues generated increases, in the same way or even more, mainly in the animal production area. In this way, appears the challenge for society, which consists in increasing the swine production without losing the environmental quality. This work aims to make a comparative analysis of data obtained through the management and treatment of manure in swine enterprises that use stabilization ponds and biodigesters located in the city of Toledo – PR. The enterprises to be studied have a production system determined as Growth and Termination Unit with animal stock ranging from 800 to 1200 swines. Twelve enterprises of the swine industry will be analyzed, six of which use stabilization ponds and six that have biodigestors in operation. The removal efficiencies of TS, FS and VS were analyzed, the estimation of the state of the biodigestion process, the mass variability, the biogas gas content of biodigesters and estimated biogas production by VS removed from biodigesters and stabilization ponds. Greater efficiencies of solids removal were observed in biodigesters. The state of the anaerobic biodigestion process presented satisfactory values mainly in the biodigesters, but both treatments indicated disturbances in the processes. There was greater mass variability in the inlet and outlet of biodigesters. The highest levels of CH4 and CO2 found were 63.10 and 38.60%, respectively. The estimated biogas production by VS removed had a mean yield of 63.23 m³ day-1 for the biodigesters and 26.44 m³ day-1 for the stabilization ponds. With the study, it was verified that greater efficiencies occurred in the handling and treatment of swine manure through the biodigesters.