Successful sulphide-driven partial denitrification : Efficiency, stability and resilience in SRT-controlled conditions
Polizzi, Cecilia (University of Florence. Department of Civil and Environmental Engineering)
Gabriel, David (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Munz, Giulio (University of Florence. Department of Civil and Environmental Engineering)

Data:	2022
Resum:	Partial denitrification is emerging as a valuable solution for NO supply in Anammox systems. When reduced sulphur compounds are used as electron donors, S-driven Partial Autotrophic Denitrification (PAD) can also be achieved, allowing for an integrated autotrophic nitrogen (N) and sulphur (S) removal from liquid and gaseous streams. The aim of the present work was to maximise NO reduction to NO coupled with complete HS oxidation, by the selective control of influent S/N ratio and sludge retention time (SRT). A 2. 5-L chemostat was operated for 115 days and three operational phases were tested at decreasing SRT of 40, 23 and 13 h, testing S/N ratios in the range of 0. 5-1 gS/gN. Successful sulphide-driven PAD was achieved and lead to average NO conversion efficiencies as high as77±17% at all the conditions tested, with the highest value of 99% at the lowest S/N of 0. 58 gS/gN and SRT of 23 h. Respirometric tests showed that NO uptake rate was stable at 90±10 mgN/gVSS/h, when NO was present as sole electron acceptor or at NO levels as high as 120 mgN/l; on the contrary, NO uptake rates were very sensitive to the applied conditions. Metabarcoding analyses revealed that the microbial community was highly enriched in Sulphur Oxidizing Bacteria (SOB>80%) and stable S-limiting conditions appeared to favour Thiobacillus over Sulfurimonas genus. A preliminary assessment of NO potential emission was also performed. To the best of our knowledge, this is the first work evaluating the synergic effect of SRT and influent S/N ratio on nitrite accumulation in highly SOB-enriched systems and the NO conversion efficiencies achieved are among the highest reported in literature.
Ajuts:	European Commission 872053
Nota:	Altres ajuts: acords transformatius de la UAB
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Sulphide-driven Partial Autotrophic Denitrification (PAD) ; Nitrite accumulation ; Sulphur oxidizing biomass (SOB) ; Influent S/N
Publicat a:	Chemosphere, Vol. 295 (May 2022) , art. 133936, ISSN 1879-1298

DOI: 10.1016/j.chemosphere.2022.133936
PMID: 35149015

9 p, 3.7 MB

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