Assessment of Nitrous Oxide and Carbon Dioxide Emissions and the Carbon Footprint in an Aerobic Granular Sludge Reactor Treating Domestic Wastewater

• DOI: 10.1089/ees.2021.0280
• Publication Date: 2021-12-14T19:36:06Z
• Authors: Gilberto Caye Daudt; Bruna Scandolara ...; Cássio Moraes Sch...; Nelson Libardi; Rejane Helena Rib...
• Keywords: Nitrous oxide; Carbon Footprint; Sequencing batch reactor; Carbon fibers

The assessment of nitrous oxide (N2O) and carbon dioxide (CO2) emissions from wastewater treatment processes using aerobic granular biomass is still scarce most them deal with synthetic in well-controlled conditions. Also, the greenhouse gases footprint process has been poorly described despite a strong impact on climate change. This work quantified analyzed N2O CO2 emissions, as well efficiency pilot-scale sequencing batch reactor sludge (AGS) fed real domestic wastewater. operational conditions applied to allowed development AGS (1.7 ± 0.40 gVSS/L), good settleability (SVI30 < 50 mL/g) removal efficiencies 84% for BOD5 65% NH4+-N. relative amount nitrogen denitrified was 22.9%, which corresponded an emission factor () 5.67% 1.68%. contribution emitted through gas phase 97.1%, flow-based 3.65 × 10−3 g N2O-N/L, while released liquid 2.9%, release 0.11 N2O-N/L. Although higher (0.297 CO2/L), terms footprint, global warming five times than ( 83.6% 16.4%).