Economic feasibility in the build and implantation of biodigester and deep pit in pig production

Abstract

The aim of this study was evaluating the build and implantation costs of biodigester and deep pit recovered by PVC or PEAD geomembrane, to store the swine waste and use it to generate extra revenue for the system. Three swine production scale representatives to São Paulo state (small pig production size: 300 housed sows; medium pig production size: 650 housed sows; large pig production size) was simulated to estimate the waste pig production and biogas as well as electric power. To simulation development, were used scientific literature and cost identification of biodigester and deep pit build items from mesoregion of Campinas, SP. The base attractive rate used was 10% a year and the time frame were 20 years. By the cash flow were determinate the internal rate of return (IRR), net present value, payback and the profitability rate to each situation. The economic analysis of waste management systems demonstrated that deep pit implantation was most cost-effective to small pig production size when compared to biodigester implantation. However, to medium and large pig production size the simulation results showed that biodigester implantation was better due to higher waste production in higher pig production systems. This provided higher fertilizer and biogas production than can be turned in electric power; result in revenue for these production systems. However, if considered the pig manure valuation as equity to commercial fertilizer, until the easiest pig manure storage system become cost-effective due to add its greatness value by your fertilizing potencial.