摘要：In this research, a technical-economic analysis of two possible alternatives for the recovery of wastewater in the sand washing process is carried out, taking as a case study a plant in the province of Cienfuegos, Cuba. The Hand’s method was used to estimate the required investment, and the Net Present Value, the Discounted Cash Flow Rate of Return and the Payback Period were analyzed as profitability indicators. The uncertainty of the results was considered from a Monte Carlo analysis. It was found that for local conditions the introduction of centrifugal classification is economically attractive conditioned by an increase in productivity and savings in energy carriers. On the other hand, the recovery of water from sewage sludge by filtration is not economically feasible. In this way, it was demonstrated that with the introduction of cleaner production practices, the analyzed system can be improved, achieving a more rational use of natural resources without giving up potential economic benefits.
