Lixiviação de nitrato em colunas de solo com diferentes densidades aparentes e fontes de efluente líquido de tratamento de esgoto doméstico

Abstract

The present work was carried out in order to evaluate the movement of the nitrate (N-NO3), originate from wastewater and treated wastewater, using an Oxisol Eutrophic medium texture, four soil densities (D1 = 1,00; D2 = 1,20; D3=1,40 c D4 = 1,60 g cm-3), in soil monolith of 600 mm and 150 mm in diameter set in PVC columns of 700 mm of length and 150 mm of diameter. T After saturation with distilled water, it was kept on top of each column, by means of a Mariotte bottle, a continuous flow of effluent. It was collected for each column, a total of 100 mL of effluent leachate, which were analyzed by UV spectrophotometer reading for detection of nitrate concentration. The results of leaching of treated effluent showed that the density of D1 presented the highest concentration (2.77 mg L-¹ NO3), with a sharp drop in concentrations of nitrate in the density D3 and D4. The results of effluent leaching showed that as it raises the density of the soil, the concentrations also increase, these values being higher for the columns with densities D3 and D4.