EVOLUÇÃO E MAGNITUDE DAS CONCENTRAÇÕES DE CÁTIONS, ÂNIONS E CARBONO NO DEJETO LÍQUIDO DE SUÍNOS EM FASE DE TERMINAÇÃO

Swine liquid wastes are an important nutrient source for physical, chemical and biological soil improvement. Characteristics change through time according to the management of animals and to farm treatment system. Anion, cation and carbon species have the greatest concentration changes in time. Current study evaluates concentration size and anion, cation and carbon evolution in finishing swine liquid wastes through anaerobic treatment system. Swine liquid wastes were collected from three farms characterized by integrated breeding system during the animals´ finishing phase. Collection occurred in the waste gut entrance and exit of the treatment system during 120 days in which the animals were installed. Retrieval occurred monthly within the bays. Anion, cation and carbon concentrations were analyzed by Ion Exchange Chromatograph, whilst total carbon was determined by Total Carbon Analyzer. Results revealed that Cl-, NH4+ and CI did not show any chemical difference between the farms. However, other chemical species had significant differences. The manure heap was highly efficient in the removal of NO2- and NO3- ions and had low efficiency for NH4+ ions. Concentration of ions Cl-, NH4+ and Ca+2 increased during the animals´ finishing period, whereas the other chemical species decreased or maintained concentrations.