Evaluation of nitrous oxide gaseous emissions from a partial nitritation reactor operating under different conditions

Milia, Stefano; Tocco, Giaime; Erby, Giovannimatteo; Carucci, Alessandra

doi:10.5004/dwt.2018.22934

Cited by 1 publication

(1 citation statement)

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“…As for the anaerobic digestion of food waste in a two-stage system (2sAD-FW), so far only preliminary studies have been reported concerning the application of PN/anammox to the treatment of simulated (synthetic) 2sAD-FW wastewater [15,16]. In particular, anammox biomass was able to withstand the high nitrogen loading rates applied to the PN reactor (up to 1.5 gN/L·d),…”

Section: Introductionmentioning

confidence: 99%

Application of anammox within an integrated approach to sustainable food waste management and valorization

et al. 2020

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In this study, the anammox process was applied for the first time to the treatment of ammonium-rich liquid residues produced by the two-stage anaerobic digestion of food waste (2sAD-FW); such residues may represent a significant environmental issue if not properly managed. A granular anammox reactor was fed with a progressively increasing share of partially nitritated 2sAD-FW wastewater. An alternative operating strategy based on partial by-pass of the partial nitritation unit was tested, in order to regulate the influent NO2/NH4 molar ratio without chemical addition. High nitrogen removal efficiency (89±1%) and negligible nitrite discharge rates were achieved, together with high nitrogen removal rate / nitrogen loading rate (NRR/NLR, 97±1%) and stable specific anammox activity (0.42±0.03 gN2-N/gVSS•d). The observed NH4removed/NO2-removed/NO3-produced molar ratio was in agreement with anammox stoichiometry, as confirmed by the low contribution (< 5%) of denitrification to nitrogen removal. Moreover, the possibility of using digital color characterization of granular biomass as a novel, simple tool for the monitoring of anammox biomass enrichment and process performance was investigated under dynamic conditions, using real wastewater: changes in granule color correlated well with the increasing share of 2sAD-FW wastewater in the influent (R 2 =83%), as well as with the decrease of anammox biomass abundance in the reactor (R 2 =68%). The results suggest that anammox may be successfully integrated into a 2sAD-FW system, thus enhancing its environmental sustainability.

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Section: Introductionmentioning

confidence: 99%