Nitrous oxide emissions from one-step partial nitritation/anammox processes

• Measurements of nitrous oxide were made at pilot and full scale plants to evaluate greenhouse gas emissions from one-step partial nitritation/anammox processes applied in moving bed biofilm reactors (MBBRs) treating reject water. It was found that 0.51-1.29% and 0.35-1.33 % of the total nitrogen loads in the pilot and full scale reactor, respectively, were emitted as nitrous oxide. Between 80-90% of nitrous oxide emissions were in gaseous form and the rest amount was found in the reactor effluent; over 90% of nitrous oxide emissions occurred in the aerated period and less than 8% in the non-aerated period in the full scale study. Nitrous oxide productions/consumptions were closely related to aeration and the nitrogen loads applied in the system.

Nyckelord

Gas phase

Liquid phase

Moving Bed Biofilm Reactor (MBBR)

Nitrous oxide emission

Partial nitritation/anammox process

Civil and Architectural Engineering

Byggvetenskap

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