Caracterização de águas residuárias de suinocultura provenientes de dois sistemas de tratamento

Abstract

The swine wastewater have physicochemical characteristics that vary according to the system of cleaning the stalls, stage of development of animals, food, weather, genetics, among other factors. In Brazil, the treatment of wastewater with high pollution load usually occurs in digesters and manure lagoon. In the vast majority of farms, the final destination of treated effluent is the soil. Therefore, the reuse of water in agriculture is carried out, what can interfere in the dynamics of various pollutants in the soil, such as pesticides. Wastewaters are presented as total and dissolved, and this fraction is more investigated in the current dynamic of these pollutants. Thus, it was used the technique of spectroscopy in the infrared Fourier transform spectroscopy to characterize the total and dissolved organic matter from swine wastewater treated in biodigester and manure lagoon. In the results, it was not possible to observe differences in the composition of the wastewater by infrared spectroscopy with Fourier transform. However, one can identify the presence of poorly degraded materials and the occurrence of nitrogen functional groups, which point to the release of nitrogen in the soil when degraded, indicating the potential for reuse of this wastewater in agriculture as a means of fertigation.