Analysing the Sustainability of the Production of Solid Recovered Fuel from ScreeningWaste
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AuthorDe la Torre Bayo, Juan Jesús; Zamorano Toro, Montserrat; Marina Ruiz, Luz; Torres Rojo, Juan Carlos; Martín Pascual, Jaime
Screening wasteSolid recovered fuelPelletisationNPVEconomic AnalysisMonte Carlo simulationCO2 emissionWastewater
De la Torre Bayo, J.J.; Zamorano Toro, M.; Ruiz, L.M.; Torres Rojo, J.C.; Martín Pascual, J. Analysing the Sustainability of the Production of Solid Recovered Fuel from ScreeningWaste. Sustainability 2023, 15, 13841. [https://doi.org/10.3390/su151813841]
SponsorshipEMASAGRA S.A. (research project No. 4325 Valorización energética de residuos de desbaste como combustible sólido recuperado para lograr el residuo cero en EDAR)
The development in wastewater management has caused a shift towards a circular model that prioritises energy generation and waste reduction. Traditional unitary processes in wastewater treatment, such as screening, only allow for landfill disposal without energy recovery. However, producing solid recovered fuel (SRF) from waste screening may be a possibility. The economic and environmental viability of this alternative, as a fundamental requirement for its implementation at industrial level, was assessed through a multi-scenario analysis using Monte Carlo simulation. The cost and benefit streams were determined based on the financial net present value (NPVf) and the social net present value (NPVs), including monetised CO2 emissions generated. The results showed that waste drying costs were found to be the most significant ones, with thermal drying being more financially advantageous than solar drying. The densification of SRF raises the costs by 7.88 to 8.48%, but its use as fuel would likely be profitable due to the economic benefits it provides. Current landfill disposal practices, which have an NPVs of −1052.60 EUR/t, are not a feasible, particularly when compared to the other SRF production scenarios, with maximum NPVs of −53.91 EUR/t. SRF production without densification using solar drying is the most acceptable scenario with the lowest NPVs (38.39 EUR/t).