N2O emission from partial nitrificaiton/anammox process in Moving Bed Biofilm Reactors
2012 (English)Conference paper, Presentation (Refereed)
Autotrophic nitrogen removal by partial nitrification/anammox is considered to be environmental friendly due to less oxygen requirement and low amount of CO2 and nitrous oxide emissions. The aim of the study was to measure nitrous oxide concentrations in one stage partial nitrification/anammox reactors and to investigate the influence of aeration strategy, which was described with ratio between non-aerated and aerated phase (Ra) and the dissolved oxygen concentrations (DO), on nitrous oxide emission. The first part of experimental study focused on the measurement of N2O concentration in two pilot scale reactors, one reactor (R1) with intermittent aeration at 25°C and the other one (R2) with continuous aeration at 22-23 °C. The second part of experiments evaluated nitrogen loads and aeration strategies on N2O emission from R1. Unisense microelectrode and Teledyne analytical instruments (Model GFC-7002E) were used to measure the nitrous oxide concentration in the liquid and gas phase. The study showed that 0.4-2% of nitrogen load was converted into nitrous oxide. Large fractions of produced N2O were detected in gas and a minor part of nitrous oxide remaining in the liquid phase. It was found that nitrous oxide emission was similar under intermittent as in continuous aeration. During intermittent aeration under DO 1.5 mg/l, more N2O was produced during aerated phase than non-aerated phase. When DO was 2.5 mg/l, around 40% of N2O was produced in the aerated phase.
Place, publisher, year, edition, pages
N2O emission, Partial nitrification/anammox process, Gas phase, Liquid phase, Moving Bed Biofilm Reactor (MBBR)
IdentifiersURN: urn:nbn:se:kth:diva-113951OAI: oai:DiVA.org:kth-113951DiVA: diva2:588120
IWA Nutrient Removal and Recovery 2012,23-25th September, 2012. Harbin, China
QC 201306142013-01-152013-01-152013-06-14Bibliographically approved