ANÁLISE DA VIABILIDADE ECONÔMICO-FINANCEIRA DE SISTEMAS DE DISPOSIÇÃO FINAL DE LODO DE ESGOTO

Abstract

Financial scenario systems on the final disposal of domestic sewage sludge are analyzed. Scenarios comprised Treatment Station, which disposes of solid residues produced for sanitary landfill, and Treatment Station that treats sewage sludge through a composting process for the production of fertilizers and the disposal of other solid wastes in the sanitary landfill. Data on inventory, infrastructure, labor, maintenance costs and warrants for functioning were obtained for the Treatment Station, with mean capacity of 3,356 m3 sludge/day. Economic indicators, net rate and internal return rate were used to analyze financial viability. Sensitiveness and risk analyses were performed to identify the items with the highest negative impact rates, coupled to financial risk, in the wake of market´s simulated prices, by the Monte Carlo method. The station for the improvement of sewage sludge for the production of organic fertilizers had the best chance of receiving investments, with a 61.6% profit/year.