Exergy and emergy: complementary tools for assessing the environmental sustainability use of biosolids generated in wastewater-treatment plant for energy-production
AUTOR(ES)
Cano, Natalia A; Céspedes-Zuluaga, Santiago; Guerrero-Martin, Camilo; Gallego, Darío
FONTE
Química Nova
DATA DE PUBLICAÇÃO
2022
RESUMO
Taking advantage of the energy contained in the biosolids generated in a wastewater treatment plant (WWTP) is one of the processes of greatest interest due to the opportunity to obtain an energy resources from a waste. The aim of this research was to analyze the environmental sustainability use of biosolids generated in a wastewater-treatment plant for energy-production by fluidized-bed gasification under exergy analysis. The energy-production system was based on previous studies of sustainable-emergy alternatives using biosolids. Sustainability of the process was evaluated by identifying stages in the energy-production system (from drying application to electricity generation) where it is possible to reduce useful energy losses as well as identifying the value of waste streams within the system through exergy analysis. It was illustrated the destroyed exergy and the efficiency by stage and by product in order to assess the effects of inefficiencies in the process sustainability. The mixture of biosolids with coal was identified as a highly sustainable stage of the process, as it presents the highest index of exergy sustainability (0.99), in contrast to the stages of energy-transformation (turbine) and gas-cleaning, which efficiencies are 0.17 and 0.4, respectively. Energy-transformation and gas-cleaning stages are of interest in terms of an improved energy recovery process, making it more efficient by applying new technologies and/or using the waste streams that have high energy potentials.
Documentos Relacionados
- Contabilidade ambiental emergética: uma análise comparativa entre sistemas de produção leiteira
- Sustainability assessment of sludge and biogas management in wastewater treatment plants using the LCA technique
- Energy generation in a Microbial Fuel Cell using anaerobic sludge from a wastewater treatment plant
- Molecular Evidence for Novel Planctomycete Diversity in a Municipal Wastewater Treatment Plant
- Use of Ultrasonic Energy in Assessing Microbial Contamination on Surfaces