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Stoichiometric evaluation of partial nitritation, anammox and denitrification processes in a sequencing batch reactor and interpretation of online monitoring parameters

TitleStoichiometric evaluation of partial nitritation, anammox and denitrification processes in a sequencing batch reactor and interpretation of online monitoring parameters
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2016
AuthorsLangone, Michela, Ferrentino R., Cadonna M., and Andreottola G.
JournalChemosphere
Volume164
Pagination488-498
ISSN00456535
Keywordsaeration, Ammonia, Ammonium compounds, ammonium derivative, anaerobic ammonia oxidizing, Anaerobic digester effluents, Anaerobic digestion, analysis, Anoxic water, article, bacterium, Batch reactors, Biodegradable organic carbon, biological phenomena and functions concerning the entire organism, Biomass, Bioreactor, Bioreactors, biotransformation, carbon, Carbon-to-nitrogen ratio, Chemical, conductance, conductivity, correlation, Correlation methods, Cyclic bio-reactor, denitrification, Denitrification process, Efficiency, Effluents, Electric conductivity, Environmental monitoring, evaluation study, isolation and purification, laboratory method, monitoring system, nitrite, Nitrites, Nitrogen, nitrogen derivative, Nitrogen removal, nutrient dynamics, Nutrient removal, online monitoring, online system, Online systems, Organic carbon, oxidation reduction potential, pH, pollutant removal, procedures, redox potential, Redox reactions, Sequencing batch reactor, Sequencing batch reactors, Stoichiometry, Temperature, waste water, Wastewater, Wastewater treatment, water management, water pollutant, Water Pollutants, Water Purification
Abstract

A laboratory-scale sequencing batch reactor (SBR) performing partial nitritation – anammox and denitrification was used to treat anaerobic digester effluents. The SBR cycle consisted of a short mixing filling phase followed by oxic and anoxic reaction phases. Working at 25 °C, an ammonium conversion efficiency of 96.5%, a total nitrogen removal efficiency of 88.6%, and an organic carbon removal efficiency of 63.5% were obtained at a nitrogen loading rate of 0.15 kg N m−3 d−1, and a biodegradable organic carbon to nitrogen ratio of 0.37. The potential contribution of each biological process was evaluated by using a stoichiometric model. The nitritation contribution decreased as the temperature decreased, while the contribution from anammox depended on the wastewater type and soluble carbon to nitrogen ratio. Denitrification improved the total nitrogen removal efficiency, and it was influenced by the biodegradable organic carbon to nitrogen ratio. The characteristic patterns of conductivity, oxidation-reduction potential (ORP) and pH in the SBR cycle were well related to biological processes. Conductivity profiles were found to be directly related to the decreasing profiles of ammonium. Positive ORP values at the end of the anoxic phases were detected for total nitrogen removal efficiency of lower than 85%, and the occurrence of bending points on the ORP curves during the anoxic phases was associated with nitrite depletion by the anammox process. © 2016 Elsevier Ltd

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84985991744&doi=10.1016%2fj.chemosphere.2016.08.094&partnerID=40&md5=0af013ce2733eb2e3a764a41f80fcc7d
DOI10.1016/j.chemosphere.2016.08.094
Citation KeyLangone2016488