Mathematical Modeling of Nitrous Oxide (N2O) Emissions from Full-Scale Wastewater Treatment Plants

2013 ◽  
Vol 47 (14) ◽  
pp. 7795-7803 ◽  
Author(s):  
Bing-Jie Ni ◽  
Liu Ye ◽  
Yingyu Law ◽  
Craig Byers ◽  
Zhiguo Yuan
Keyword(s):  
Mathematical Modeling ◽  
Nitrous Oxide ◽  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Full Scale ◽  
N2o Emissions

scholarly journals Evaluation of the Nitrous Oxide Emission Reduction Potential of an Aerobic Bioreactor Packed with Carbon Fibres for Swine Wastewater Treatment

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1013 ◽  
Author(s):  
Takahiro Yamashita ◽  
Makoto Shiraishi ◽  
Hiroshi Yokoyama ◽  
Akifumi Ogino ◽  
Ryoko Yamamoto-Ikemoto ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Treatment Method ◽  
N2o Emission ◽  
Swine Wastewater ◽  
N2o Emissions ◽  
Carbon Fibres

Nitrous oxide (N2O) is a potent greenhouse gas that is emitted from wastewater treatment plants. To reduce emissions of N2O from swine wastewater treatment plants, we constructed an experimental aerobic bioreactor packed with carbon fibres (ca. 1 m3 bioreactor) as an alternative to conventional activated sludge treatment. The N2O emission factor for the aerobic bioreactor packed with carbon fibres (CF) was 0.002 g N2O-N/g TN-load and the value for the typical activated sludge (AS) reactor was 0.013 g N2O-N/g TN-load. The CF treatment method achieved more than 80% reduction of N2O emissions, compared with the AS treatment method. The experimental introduction of a CF carrier into an actual wastewater treatment plant also resulted in a large reduction in N2O generation. Specifically, the N2O emission factors decreased from 0.040 to 0.005 g N2O-N/g TN-load following application of the carrier. This shows that it is possible to reduce N2O generation by more than 80% by using a CF carrier during the operation of an actual wastewater treatment plant. Some bacteria from the phylum Chloroflexi, which are capable of reducing N2O emissions, were detected at a higher frequency in the biofilm on the CF carrier than in the biofilm formed on the AS reactor.

Oxygen-induced dynamics of nitrous oxide in water and off-gas during the treatment of digester supernatant

2013 ◽  
Vol 69 (1) ◽  
pp. 84-91 ◽  
Author(s):  
F. Stenström ◽  
K. Tjus ◽  
J. la Cour Jansen
Keyword(s):  
Nitrous Oxide ◽  
Wastewater Treatment ◽  
Oxygen Concentration ◽  
Total Nitrogen ◽  
Batch Reactor ◽  
Full Scale ◽  
Bulk Liquid ◽  
N2o Emissions ◽  
Low Oxygen ◽  
Low Oxygen Concentration

Nitrous oxide (N2O) is a potent greenhouse gas and of special concern in wastewater treatment. It is formed in biological wastewater treatment under both aerobic and anaerobic conditions. A major reason for high N2O emissions is low oxygen concentration during nitrification. In this full-scale study of N2O emissions from a sequencing batch reactor for treating digester supernatant, the oxygen concentration was reduced stepwise to investigate how N2O emissions were influenced. N2O concentrations were measured online in water and off-gas. A distinct relationship was found between low oxygen concentration and high N2O emissions. N2O was formed in water during both nitrification and denitrification. Decreased oxygen concentration during nitrification led to increased nitrite concentration, which in turn led to increased N2O concentration in the subsequent denitrification phase. When the nitrification resumed, accumulated N2O was stripped off to the atmosphere. Very high concentrations of N2O, over 56,000 ppmv, were measured in the off-gas. Furthermore, the maximum amount of N2O emitted during one cycle corresponded to 107.6% of the total nitrogen load (21.9% of total nitrogen present in the bulk liquid at the beginning of the cycle). This is among the highest emission levels ever measured from a full-scale municipal plant for digester supernatant.

Dynamics of nitrogen oxides emission from a full-scale sludge liquor treatment plant with nitritation

2011 ◽  
Vol 63 (12) ◽  
pp. 2838-2845 ◽  
Author(s):  
D. J. I. Gustavsson ◽  
J. la Cour Jansen
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Oxides ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Ammonium Nitrogen ◽  
Full Scale ◽  
Normal Operation ◽  
N2o Emissions ◽  
Ammonium Oxidation ◽  
Intergovernmental Panel

Biological treatment in wastewater treatment plants (WWTPs) is a source of nitrogen oxides (N2O, NO and NO2) emitted to the atmosphere. Aerobic ammonia-oxidising bacteria (AOB) have been suggested to be the main source of these emissions. In a full-scale sludge liquor treatment plant at Sjölunda WWTP, it was shown that significant emissions of N2O, NO and NO2 do occur. The plant is operated with nitritation alone, which gives an environment enriched in aerobic AOB. During normal operation, emissions of N2O, NO and NO2 were found to be 3.8%, 0.06% and 0.01% of the ammonium nitrogen load. The N2O emissions were larger than the recommended estimated figure of the Intergovernmental Panel on Climate Change (IPCC) for a complete wastewater treatment plant. The N2O emissions correlated positively with the length of the previous anoxic period, i.e., settling and decantation, and with the ammonium oxidation rate. The NO and NO2 emission profiles were similar and dependent on ammonium oxidation and DO level, but the NO2 concentrations were always lower.

Full-scale comparison of N2O emissions from SBR N/DN operation versus one-stage deammonification MBBR treating reject water – and optimization with pH set-point

2019 ◽  
Vol 79 (8) ◽  
pp. 1616-1625 ◽  
Author(s):  
L. Kanders ◽  
J-J. Yang ◽  
C. Baresel ◽  
J. Zambrano
Keyword(s):  
Nitrous Oxide ◽  
Wastewater Treatment Plants ◽  
Feeding Strategy ◽  
Batch Reactor ◽  
Full Scale ◽  
Biofilm Reactor ◽  
N2o Emissions ◽  
Set Point ◽  
Reject Water ◽  
Aeration Time

Abstract To be able to fulfill the Paris agreement regarding anthropogenic greenhouse gases, all potential emissions must be mitigated. Wastewater treatment plants should aim to eliminate emissions of the most potent greenhouse gas, nitrous oxide (N2O). In this study, these emissions were measured at a full-scale reject water treatment tank during two different operation modes: nitrification/denitrification (N/DN) operating as a sequencing batch reactor (SBR), and deammonification (nitritation/anammox) as a moving bed biofilm reactor (MBBR). The treatment process emitted significantly less nitrous oxide in deammonification mode 0.14–0.7%, compared to 10% of total nitrogen in N/DN mode. The decrease can be linked to the changed feeding strategy, the lower concentrations of nitrite, a lower load of ammonia oxidized, a shorter aeration time, the absence of non-optimized ethanol dosage or periodic lack of oxygen as well as the introduction of biofilm. Further, evaluation was done how the operational pH set point influenced the emissions in deammonification mode. Lower concentrations of nitrous oxide were measured in water phase at higher pH (7.5–7.6) than at lower pH (6.6–7.1). This is believed to be mainly because of the lower aeration ratio and increased complete denitrification at the higher pH set point.

Emission of nitrous oxide and nitric oxide from a full-scale single-stage nitritation-anammox reactor

2009 ◽  
Vol 60 (12) ◽  
pp. 3211-3217 ◽  
Author(s):  
M. J. Kampschreur ◽  
R. Poldermans ◽  
R. Kleerebezem ◽  
W. R. L. van der Star ◽  
R. Haarhuis ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Nitrous Oxide ◽  
Wastewater Treatment Plants ◽  
N2o Emission ◽  
Oxygen Limitation ◽  
Full Scale ◽  
Single Stage ◽  
Normal Operation ◽  
Nitrite Accumulation ◽  
N2o Emissions

At a full-scale single-stage nitritation-anammox reactor, off-gas measurement for nitric oxide (NO) and nitrous oxide (N2O) was performed. NO and N2O are environmental hazards, imposing the risk of improving water quality at the cost of deteriorating air quality. The emission of NO during normal operation of a single-stage nitritation-anammox process was 0.005% of the nitrogen load while the N2O emission was 1.2% of the nitrogen load to the reactor, which is in the same range as reported emission from other full-scale wastewater treatment plants. The emission of both compounds was strongly coupled. The concentration of NO and N2O in the off-gas of the single-stage nitritation-anammox reactor was rather dynamic and clearly responded to operational variations. This exemplifies the need for time-dependent measurement of NO and N2O emission from bioreactors for reliable emission estimates. Nitrite accumulation clearly resulted in increased NO and N2O concentrations in the off-gas, yielding higher emission levels. Oxygen limitation resulted in a decrease in NO and N2O emission, which was unexpected as oxygen limitation is generally assumed to cause increased emissions in nitrogen converting systems. Higher aeration flow dramatically increased the NO emission load and also seemed to increase the N2O emission, which stresses the importance of efficient aeration control to limit NO and N2O emissions.

Automatic buffer capacity based sensor for effluent quality monitoring

1996 ◽  
Vol 33 (1) ◽  
pp. 81-87
Author(s):  
L. Van Vooren ◽  
P. Willems ◽  
J. P. Ottoy ◽  
G. C. Vansteenkiste ◽  
W. Verstraete
Keyword(s):  
Wastewater Treatment ◽  
Buffer Capacity ◽  
Wastewater Treatment Plants ◽  
Data Interpretation ◽  
Full Scale ◽  
Quality Monitoring ◽  
Effluent Quality ◽  
Capacity Curves ◽  
On Line

The use of an automatic on-line titration unit for monitoring the effluent quality of wastewater plants is presented. Buffer capacity curves of different effluent types were studied and validation results are presented for both domestic and industrial full-scale wastewater treatment plants. Ammonium and ortho-phosphate monitoring of the effluent were established by using a simple titration device, connected to a data-interpretation unit. The use of this sensor as the activator of an effluent quality proportional sampler is discussed.

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