Release of nitric and nitrous oxides from denitrifying activated sludge

Schulthess, R. von; Kühni, Martin; Gujer, Willi

doi:10.1016/0043-1354(94)e0108-i

Cited by 152 publications

(74 citation statements)

References 21 publications

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“…Some studies showed that the inhibitory effect of denitrifiers was not directly due to NO2-N, but due to its role in the biological formation of NO, which was a highly toxic compound [38]. Hence, during denitrification with NO2-N as the electron acceptor, it was possible that a low C/N ratio meant a carbon shortage and led to NO accumulation, which inhibited the activity of denitrification and induced increased N2O emissions; in addition, NO2-N might inhibit the N2O reductase activity and cause N2O emissions [36,39]. The N2O emission factor during denitrification under different C/N ratios was in the range of 12.0%-26.6%.…”

Section: Effect Of C/n Ratios On N2o Emissions During Denitrificationmentioning

confidence: 99%

Nitritation and N2O Emission in a Denitrification and Nitrification Two-Sludge System Treating High Ammonium Containing Wastewater

Zheng

Xing

2014

Water

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Abstract:The effective management of high ammonium containing wastewater is important for the sustainable development of the wastewater industry. A pre-denitrification and post-nitrification two-sludge system was proposed to treat high ammonium containing wastewater with low carbon-to-nitrogen (C/N) ratios. In the system, pre-denitrification was adopted to use organic carbon in raw wastewater efficiently for nitrogen removal, while post-nitrification was adopted to achieve nitritation. System performance and the characteristics of nitrous oxide (N2O) emission were examined. As to the influent chemical oxygen demand (COD) and ammonium nitrogen (NH4-N) concentration, both 800 mg/L, nitrogen removal was mainly through pre-denitrification, and the nitrogen removal percentage was 43.4%. In post-nitrification, nitritation was achieved with a nitrite accumulation efficiency of 97.8% and a NH4-N removal loading rate of 0.45 g/(L·d). With nitrite as the electron acceptor during denitrification, its removal rate increased, while the N2O emission factor decreased with increasing C/N ratios. Nitrification was affected significantly by the aeration rate. When the aeration rate was below 0.6 L/min, the NH4-N removal rate increased, while the N2O emission rate decreased with increasing aeration rates. However, when the aeration rate was above 0.6 L/min, it had little influence on N2O OPEN ACCESSWater 2014, 6 2979 emission. During nitrification, N2O emission factors decreased exponentially with increasing ammonium oxidation rates.

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Section: Effect Of C/n Ratios On N2o Emissions During Denitrificationmentioning

confidence: 99%

Nitritation and N2O Emission in a Denitrification and Nitrification Two-Sludge System Treating High Ammonium Containing Wastewater

Zheng

Xing

2014

Water

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“…This accumulated nitrite could be highly toxic to human and aquatic animals when it was contaminated to environments (Chow and Hong, 2002;Jensen, 2003). Importantly, many researches reported that the presence of nitrite accumulated during the denitrification process can promote an accumulation of nitric and nitrous oxides, reflecting incomplete denitrification processes (Schulthess et al 1995;Béline et al 1999;Alinsafi et al 2008). The emission of nitrous oxide (N 2 O) also causes undesirable environmental problems, such as the green house effect and ozone depletion in the stratosphere (Park et al 2000).…”

Section: Discussionmentioning

confidence: 99%

Influence of metal ions and organic carbons on denitrification activity of the halotolerant bacterium, Paracoccus pantotrophus P16 a strain from shrimp pond

Pintathong¹,

Richardson²,

Spiro³

et al. 2009

Electron. J. Biotechnol.

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“…A possible explanation for the decreasing trend was a high DO level in the later period. Von Schulthess et al (1994) and Molodovskaya et al (2008) reported that low DO levels (<4 mg O 2 L -1 ) favored N 2 O formation. During the final few days of the current experiment, the DO level reached 6.3 mg O 2 L -1 .…”

Section: Ch 4 and Co 2 Emissions From Rlm And Bdementioning

confidence: 99%

Comparison of Air Emissions from Raw Liquid Pig Manure and Biogas Digester Effluent Storages

2014

Trans.ASABE

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Biogas digesters are commonly used in livestock farming in China. The digestion process converts large amounts of raw liquid manure (RLM) to biogas digester effluent (BDE). The BDE is then stored on the farm for some time before land application as crop or orchard nutrients. Storage of RLM or BDE is associated with gas emissions, although little information is available concerning comparison of air emissions between the two handling practices. This study was conducted to compare methane (CH 4 ), carbon dioxide (CO 2 ), nitrous oxide (N 2 O), and ammonia (NH 3 ) emissions from RLM and BDE storages using dynamic emission vessels (DEVs). Both media were stored in closed vessels (50 L) at a 40Â cm storage depth, a constant storage temperature of 30Â°C, and a headspace air exchange rate of 15 to 17 air changes per hour (ACH) for 22 days. The results showed that the average daily gas emission rates for RLM and BDE, in mg L -1 d -1 , were, respectively, 102.9 and 125.3 CO 2 (p < 0.05), 0.72 and 3.33 N 2 O (p < 0.05), 29.2 and 0.32 CH 4 (p < 0.05), and 1.21 and 0.66 NH 3 (p = 0.08). The total greenhouse gas (GHG = CH 4 + CO 2 + N 2 O) emissions were similar for RLM and BDE, 1.05 and 1.12 g CO 2 -eq L -1 d -1 , respectively (p = 0.26). Nitrous oxide (N 2 O) emissions accounted for 88.2% of the CO 2 -eq GHG emissions for BDE, whereas CH 4 emissions accounted for 69.7% of the CO 2 -eq GHG emissions for RLM. The high N 2 O emissions from BDE likely resulted from the lower COD/N ratio in BDE than RLM under the storage conditions. Differences in gaseous emission characteristics between RLM and BDE were attributed to the differences in methanogen species and the population of ammonia-oxidizing bacteria (AOB). were, respectively, 102.9 and 125.3 CO 2 (p < 0.05), 0.72 and 3.33 N 2 O (p < 0.05), 29.2 and 0.32 CH 4 (p < 0.05), and 1.21 and 0.66 NH 3 (p = 0.08

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Release of nitric and nitrous oxides from denitrifying activated sludge

Cited by 152 publications

References 21 publications

Nitritation and N2O Emission in a Denitrification and Nitrification Two-Sludge System Treating High Ammonium Containing Wastewater

Nitritation and N2O Emission in a Denitrification and Nitrification Two-Sludge System Treating High Ammonium Containing Wastewater

Influence of metal ions and organic carbons on denitrification activity of the halotolerant bacterium, Paracoccus pantotrophus P16 a strain from shrimp pond

Comparison of Air Emissions from Raw Liquid Pig Manure and Biogas Digester Effluent Storages

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