Journal ArticleDOI
Evaluation of the spatial and temporal variability of nitrous oxide (N2O) emissions at two different full-scale aerobic treatment systems used in the post-treatment of UASB effluents in Brazil
Renato Pereira Ribeiro,Heitor Breno P. Ferreira,Armando E. Uberti,Renato Rocha Valério,Renato Rocha Valério,Julio Cezar Rietow,Karina G.C. Amaral,Miguel Mansur Aisse +7 more
TLDR
In this paper, the variability of N2O emissions from two aerobic treatment systems, activated sludge (AS) and low-rate trickling filter (TF), operated as post-treatments in upflow anaerobic sludge blanket reactors (UASB), under different operational conditions: (1) employed aeration system, (2) biomass growth and (3) environmental conditions.Abstract:
Monitoring of nitrous oxide (N2O) emissions from wastewater treatment plants (WWTP) correlated to different operational conditions plays an important role in proposing mitigation strategies. However, few full-scale studies are available so far correlating N2O emission factors (EF) from wastewater treatment systems to different structural, operational and environmental configurations. In this context, the aim of this study was to evaluate the variability of N2O emissions from two aerobic treatment systems, activated sludge (AS) and low-rate trickling filter (TF), operated as post-treatments in upflow anaerobic sludge blanket reactors (UASB), under different operational conditions: (1) employed aeration system, (2) biomass growth and (3) environmental conditions, with a main focus on the generation of N2O EFs for these types of systems. Both studied systems displayed high temporal variability in N2O emissions associated with different operational and environmental conditions, such as: (1) aeration intermittency and high amplitudes of influent N loads for the AS system, (2) recirculation of treated wastewater and different wastewater temperatures for the TF system. In addition, the temporal variability of methane (CH4) emissions was also significant, with greater amplitudes for the AS system, due to the greater air-stripping effect intensified by the combination of intermittency and excess aeration. Finally, regardless of the employed operational condition, the average EFs (N2O and CH4) determined for the WWTP-1 aeration tank (AT) (0.04 % and 0.054 %) and WWTP-2 TF (0.005 % and 0.015 %) were substantially lower than the N2O and CH4 EFs (1.6 % and 0.75 %) suggested by the IPCC, for centralized WWTPs with aerobic systems.read more
Citations
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Greenhouse gas production in wastewater treatment - Process selection is the major factor
Jurg Keller,Ken Hartley +1 more
TL;DR: In this article, the authors compared the GHG production of a number of case studies with aerobic or anaerobic main and sludge treatment of domestic wastewater and also looked at the energy balances and economics.
Journal ArticleDOI
Applications of Up-flow Anaerobic Sludge Blanket (UASB) and characteristics of its microbial community: a review of bibliometric trend and recent findings
Maria Cristina Collivignarelli,Alessandro Abbà,Francesca Maria Caccamo,Silvia Calatroni,Vincenzo Torretta,Ioannis A. Katsoyiannis,Marco Carnevale Miino,Elena Cristina Rada +7 more
TL;DR: A meta-analysis of bibliometric data highlighted the growing interest in four diverse topics: (i) energy recovery production; (ii) combination with other treatments; (iii) the study of processes for the removal of specific pollutants and, (iv) characterization of microbial community and granular sludge composition as mentioned in this paper.
Journal ArticleDOI
Assessment of Nitrous Oxide and Carbon Dioxide Emissions and the Carbon Footprint in an Aerobic Granular Sludge Reactor Treating Domestic Wastewater
TL;DR: In this article , the authors quantified and analyzed the N2O and CO2 emissions, as well as the treatment efficiency of a pilot-scale sequencing batch reactor with aerobic granular sludge (AGS) fed with real domestic wastewater.
Journal ArticleDOI
Enhanced biological nitrogen and phosphorus removal from sewage driven by fermented glycerol: comparative assessment between sequencing batch- and continuously fed-structured fixed bed reactor
J. Lopes,Bruno Garcia Silva,M.E. Dias,Rodrigo B. Carneiro,Márcia Helena Rissato Zamariolli Damianovic,Eugenio Foresti +5 more
TL;DR: It was concluded that the batch feeding method was determinant for phosphorus removal and the structured fixed bed reactor with polyurethane foam proved to be feasible in the removal of organic matter and nutrients remaining in the UASB reactor effluent.
References
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Journal ArticleDOI
Nitrous Oxide (N2O): The Dominant Ozone-Depleting Substance Emitted in the 21st Century
TL;DR: In this paper, the ozone depletion potential-weighted anthropogenic emissions of N2O with those of other ozone-depleting substances were compared, and it was shown that N 2O emission currently is the single most important ozone-destroying emission and is expected to remain the largest throughout the 21st century.
Journal Article
Nitrous oxide (N_2O) : the dominanat ozone-depleting substance emitted in the 21st century
TL;DR: Nitrous oxide emission currently is the single most important ozone-depleting emission and is expected to remain the largest throughout the 21st century, and N2O is unregulated by the Montreal Protocol, which would enhance the recovery of the ozone layer from its depleted state and reduce the anthropogenic forcing of the climate system.
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Role of nitrifier denitrification in the production of nitrous oxide
TL;DR: In this article, the authors present knowledge about Nitrifier denitrification is summarized in order to give an exact definition, to spread awareness of its pathway and controlling factors and to identify areas of research needed to improve global N 2 O budgets.