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Determination of the Nitrous Oxide Emission Potential of Deammonification under Anoxic Conditions

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Abstract:

Various studies have been performed to determine the nitrous oxide (N2O) emissions from conventional biological nitrogen removal processes in wastewater treatment like nitrification and denitrification in the main stream. But, with respect to the overall emissions of WWTP, partstream treatment for high-strength wastewater (e.g. sludge liquor) is also expected to hold a significant emission potential due to high concentrations and extreme boundary conditions. This paper presents the results from a lab-scale study on nitrous oxide production by biomass from a deammonification process (nitritation + anammox) under anoxic conditions. It was discovered that N2O formation results from incomplete endogenous denitrification rather than anammox and is dependent from substrate availability. Based on direct measurements of the dissolved N2O concentrations in a SBR reactor, the dynamic behavior of N2O production is characterized in more detail. The results show that – during anoxic conditions – the N2O emission potential of deammonification is significantly lower than from conventional denitrification.

Keywords: Anammox; Denitrification; greenhouse gas; nitrous oxide emission

Document Type: Research Article

DOI: https://doi.org/10.2175/193864711802867757

Publication date: 2011-01-01

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