Nitrous Oxide Emissions from Municipal Wastewater Treatment

1995 ◽  
Vol 29 (9) ◽  
pp. 2352-2356 ◽  
Author(s):  
Peter. Czepiel ◽  
Patrick. Crill ◽  
Robert. Harriss
Keyword(s):  
Nitrous Oxide ◽  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Nitrous Oxide Emissions ◽  
Municipal Wastewater Treatment

scholarly journals Unwanted mainstream nitritation-denitritation causing massive N2O emissions in a continuous activated sludge process

2021 ◽  
Author(s):  
A. Kuokkanen ◽  
K. Blomberg ◽  
A. Mikola ◽  
M. Heinonen
Keyword(s):  
Nitrous Oxide ◽  
Wastewater Treatment ◽  
Activated Sludge ◽  
Nitrogen Removal ◽  
Municipal Wastewater ◽  
Nitrous Oxide Emissions ◽  
N2o Emissions ◽  
Activated Sludge Process ◽  
Municipal Wastewater Treatment ◽  
Activated Sludge Processes

Abstract Nitrous oxide emissions can contribute significantly to the carbon footprint of municipal wastewater treatment plants even though emissions from conventional nitrogen removal processes are assumed to be moderate. An increased risk for high emissions can occur in connection with process disturbances and nitrite (NO2−) accumulation. This work describes the findings at a large municipal wastewater treatment plant where the levels of NO2− in the activated sludge process effluent were spontaneously and strongly increased on several activated sludge lines which was suspected to be due to shortcut nitrogen removal that stabilized for several months. The high NO2− levels were linked to a dramatic increase in nitrous oxide (N2O) emissions. As much as over 20% of the daily influent nitrogen load was emitted as N2O. These observations indicate that highly increased NO2− levels can occur in conventional activated sludge processes and result in high nitrous oxide emissions. They also raise questions concerning the risk of increased greenhouse gas (GHG) emissions of the nitritation-denitritation processes – although the uncontrolled nature of the event described here must be taken into consideration – and underline the importance of continuous monitoring and control of N2O emissions.

Methane and nitrous oxide emissions from municipal wastewater treatment – results from a long-term study

2013 ◽  
Vol 67 (10) ◽  
pp. 2350-2355 ◽  
Author(s):  
M. R. J. Daelman ◽  
E. M. van Voorthuizen ◽  
L. G. J. M. van Dongen ◽  
E. I. P. Volcke ◽  
M. C. M. van Loosdrecht
Keyword(s):  
Carbon Dioxide ◽  
Nitrous Oxide ◽  
Wastewater Treatment ◽  
Carbon Footprint ◽  
Municipal Wastewater ◽  
Carbon Dioxide Emission ◽  
Treatment Plant ◽  
Nitrous Oxide Emissions ◽  
Municipal Wastewater Treatment ◽  
Long Term Study

Methane and nitrous oxide emissions from a fully covered municipal wastewater treatment plant were measured on-line during 16 months. At the plant under study, nitrous oxide contributed three-quarters to the plant's carbon footprint, while the methane emission was slightly larger than the indirect carbon dioxide emission related to the plant's electricity and natural gas consumption. This contrasted with two other wastewater treatment plants, where more than 80% of the carbon footprint came from the indirect carbon dioxide emission. The nitrous oxide emission exhibited a seasonal dynamic, of which the cause remains unclear. Three types of air filter were investigated with regard to their effectiveness to remove methane from the off-gas.

scholarly journals Managing Municipal Wastewater Treatment to Control Nitrous Oxide Emissions from Tidal Rivers

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1255
Author(s):  
Chandra Sekhar Akella ◽  
S. Murty Bhallamudi
Keyword(s):  
Nitrous Oxide ◽  
Municipal Wastewater ◽  
High Tide ◽  
Tidal River ◽  
Nitrous Oxide Emissions ◽  
N2o Emissions ◽  
Municipal Wastewater Treatment ◽  
Water Release ◽  
Decision Variables ◽  
Waste Load

Waste load allocation management models were developed for controlling nitrous oxide emissions from a tidal river. The decision variables were treatment levels at wastewater discharging stations and the rate of upstream water release. The simulation model for N2O emissions from the river was embedded in the optimization model and the problem was solved using the simulated annealing technique. In two of the models, the total cost was minimized, while in the third model, emissions from the river were minimized for a specified constraint on the available money. Proof-of-concept studies, with hypothetical scenarios for contaminant loading but realistic flow conditions corresponding to the Tyne River, UK, were carried out. It was found that the treatment cost could be reduced by 36% by treating wastewater discharges in the upper reaches more during the high tide as compared to during low tide. For the same level of N2O emissions, approximately 16.7% lesser costs could be achieved by not only treating the wastewater but also inducing dilution by releasing more water from the upstream side. It was also found that beyond a limit, N2O emissions cannot be reduced significantly by spending more money on treatment and water release.

STUDIES REGARDING THE PERFORMANCES OF MUNICIPAL WASTEWATER TREATMENT PROCESSES

2006 ◽  
Vol 5 (4) ◽  
pp. 685-692
Author(s):  
Elisabeta Chirila ◽  
Ionela Carazeanu Popovici ◽  
Techin Ibadula ◽  
Alice Iordache
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Municipal Wastewater Treatment ◽  
Treatment Processes
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