Abstract
ABSTRACT The disposal of treated effluents on soil is the main final use of wastewater in Brazil. Although this practice can promote improvements of some soil attributes, there is a need for monitoring in order to ensure that potential environmental impacts are not harmful. Thus, the purpose of this study was to evaluate the effects of treated effluent from a poultry slaughterhouse on the chemical attributes of an Oxisols, in Matelândia-PR, Brazil under drip irrigation. The soil attributes P, K, Fe, Cu, Zn, Mn, pH in CaCl2, H + Al, Al, Ca, Mg, cation exchange capacity (CEC), and percent base saturation (V) were evaluated under four effluent application rates, 0, 100, 200 and 300 m³ ha-1 d-1 with treated effluents on three successive sampling dates. As main results it was observed that high irrigation rates increased soil phosphorus and potassium concentrations. In addition, an association between the increase of soil potential acidity and exchangeable acidity was detected, although pH did not vary significantly either between treatments or between sampling dates.
Highlights
With a production exceeding 13 million tons in 2017, Brazil has been becoming the second main producer of poultry in the world, standing only behind the United States of America, with a production of approximately 19 million tons (USDA, 2018).This prominent position in the world market implies concerns about the sustainability of the business, especially regarding water consumption and wastewater disposal
The main post-treatment disposal alternative of this effluent in Brazil is the application into the soil
The treated effluent is disposed in the reforestation areas of industrial poultry slaughtering unit (IPSU)
Summary
With a production exceeding 13 million tons in 2017, Brazil has been becoming the second main producer of poultry in the world, standing only behind the United States of America, with a production of approximately 19 million tons (USDA, 2018). This prominent position in the world market implies concerns about the sustainability of the business, especially regarding water consumption and wastewater disposal. The main post-treatment disposal alternative of this effluent in Brazil is the application into the soil This practice may be contemplated as a secondary treatment (Bustillo-Lecompte & Mehrvar, 2015). Further research is needed to assess the most appropriate rates of effluent application and the effects of commonly employed rates on soil attributes
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