Dinitrogen oxide detection for nitrification failure early warning systems

Butler, Mark; Stephenson, Tom; Stokes, L.; Stuetz, Richard M.

doi:10.2166/wst.2005.0270

Cited by 7 publications

(4 citation statements)

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“…More recently, Burgess et al (2002a) demonstrated a strong relationship between ammonia shock loads and the concentration of N 2 O in the off-gas from the aeration tank. This suggests that the changes in N 2 O concentration in the exhaust gas from a nitrifying process may be a useful parameter for monitoring such processes (Burgess et al, 2002b;Butler et al, 2005a). As a result, a more efficient earlywarning system for the nitrification processes can be established based on N 2 O emissions as long as the off-gas N 2 O concentration can be monitored on line.…”

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confidence: 99%

Nitrous oxide emissions for early warning of biological nitrification failure in activated sludge

et al. 2009

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Experiments were carried out to establish whether nitrous oxide (N2O) could be used as a non-invasive early warning indicator for nitrification failure. Eight experiments were undertaken; duplicate shocks DO depletion, influent ammonia increases, allylthiourea (ATU) shocks and sodium azide (NaN3) shocks were conducted on a pilot-scale activated sludge plant which consisted of a 315 L completely mixed aeration tank and 100 L clarifier. The process performed well during pre-shock stable operation; ammonia removals were up to 97.8% and N2O emissions were of low variability (<0.5 ppm). However, toxic shock loads produced an N2O response of a rise in off-gas concentrations ranging from 16.5 to 186.3 ppm, followed by a lag-time ranging from 3 to 5 h ((0.43-0.71) x HRT) of increased NH3-N and/or NO2(-) in the effluent ranging from 3.4 to 41.2 mg L(-1). It is this lag-time that provides the early warning for process failure, thus mitigating action can be taken to avoid nitrogen contamination of receiving waters.

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confidence: 99%

Nitrous oxide emissions for early warning of biological nitrification failure in activated sludge

et al. 2009

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“…Nitrous oxide (N 2 O) emission monitoring was used by Burgess et al [22] and Butler et al [16,23] for nitrification failure early warning. The disruption of nitrification due to shocking load, toxic substance was reflected in the immediate increasing of N 2 O emission.…”

Section: Optimization Strategies For Partial Nitrificationmentioning

confidence: 99%

“…The N 2 O emission monitoring has been used for early warning and aeration control of complete nitrification process [16,17,22,23]. The integration of N 2 O emission data in partial nitrification optimization has not been investigated.…”

Section: Partial Nitrification Considering N 2 O Emissionmentioning

confidence: 99%

Model based optimization of partial nitrification by monitoring nitrous oxide (N2O) emission

Jiang

et al. 2015

Journal of Environmental Chemical Engineering

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“…Nevertheless, human activity may intensify these emissions, for example by the discharge of wastewater containing large organic matter concentrations that decreases the dissolved oxygen (DO) levels in water, and thus favors the N-oxides production [5]. N 2 O gas is an intermediate or a sub-product of biological processes such as denitrification and nitrification, respectively [6][7][8].…”

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N2O Production by Nitrifying Biomass Under Anoxic and Aerobic Conditions

Campos

Arrojo

Vázquez-Padín

et al. 2008

Appl Biochem Biotechnol

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The capacity of nitrifying biomass, grown in biofilms or in suspension, to reduce NO(2) (-) and NO(3) (-) under anoxic conditions was tested in batch experiments. The estimated reduction rates were 5 and 25 mg N per gram volatile suspended solids (VSS) per day for nitrate and nitrite, respectively, in the case of the nitrifying biofilms. Activity tests carried out with successive feedings indicated that no acclimation of the biomass to the tested conditions occurred, as the obtained reduction rates remained almost constant. Another series of activity assays was carried out with nitrifying suspended biomass, and the reduction rates for nitrate and nitrite were 30.4 and 48.9 mg N per gram VSS per day, respectively. N(2)O and N(2) were the final gaseous products, and their percentages depended on the source of nitrogen feed. The specific production of nitrous oxide during nitrification was investigated during continuous experiments in a biofilm airlift suspension reactor. Specific production rates up to 46 mg N(2)O-N per gram VSS per day were measured. The percentage of N(2)O produced represented up to 34.4% of the ammonia oxidized. Nitrite accumulation, low dissolved oxygen concentrations, and the presence of organic matter favored the production of nitrous oxide. N(2)O gas was not detected during the oxidation of nitrite even when organic matter was present. To prevent N(2)O gas production in nitrifying systems, the operation at low dissolved oxygen concentrations, nitrite presence, or organic matter content should be avoided.

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Dinitrogen oxide detection for nitrification failure early warning systems

Cited by 7 publications

References 0 publications

Nitrous oxide emissions for early warning of biological nitrification failure in activated sludge

Nitrous oxide emissions for early warning of biological nitrification failure in activated sludge

Model based optimization of partial nitrification by monitoring nitrous oxide (N2O) emission

N2O Production by Nitrifying Biomass Under Anoxic and Aerobic Conditions

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