This study aimed to evaluate total N, N-NH4+ and N-NO3– concentrations and pH in columns of alkalinized anaerobic sewage sludge and in percolated liquid, in simulation of real storage conditions. The experiment was conducted in Curitiba – Paraná state, in Cfb climate and rainfall of 197 mm during the incubation period (48 days). The tested factors were: 3 sludge types (covered alkalinized sludge – LCC; uncovered alkalinized sludge – LCD; and uncovered raw sludge – LBD), 4 incubation periods (0; 15; 27; and 48 days) […]