Low Temperature
Partial Nitritation/Anammox in a Moving
Bed Biofilm Reactor Treating Low Strength Wastewater
Eva M. Gilbert
Shelesh Agrawal
Søren
M. Karst
Harald Horn
Per H. Nielsen
Susanne Lackner
10.1021/es501649m.s001
https://acs.figshare.com/articles/journal_contribution/Low_Temperature_Partial_Nitritation_Anammox_in_a_Moving_Bed_Biofilm_Reactor_Treating_Low_Strength_Wastewater/2268421
Municipal wastewater collected in
areas with moderate climate is
subjected to a gradual temperature decrease from around 20 °C
in summer to about 10 °C in winter. A lab-scale moving bed biofilm
reactor (MBBR) with carrier material (K3 from AnoxKaldnes) was used
to test the tolerance of the overall partial nitritation/anammox process
to this temperature gradient. A synthetic influent, containing only
ammonium and no organic carbon was used to minimize denitrification
effects. After stable reactor operation at 20 °C, the temperature
was slowly reduced by 2 °C per month and afterward held constant
at 10 °C. Along the temperature decrease, the ammonium conversion
dropped from an average of 40 g<sub>N</sub> m<sup>–3</sup> d<sup>–1</sup> (0.2 g<sub>N</sub> kg<sub>TSS</sub> h<sup>–1</sup>) at 20 °C to about 15 g<sub>N</sub> m<sup>–3</sup> d<sup>–1</sup> (0.07 g<sub>N</sub> kg<sub>TSS</sub> h<sup>–1</sup>) at 10 °C, while the effluent concentration was kept <8
mg<sub>NH4‑N</sub> l<sup>–1</sup> during the whole operation.
This also resulted in doubling of the hydraulic retention time over
the temperature ramp. The MBBR with its biofilm on 10 mm thick carriers
proved to sufficiently sustain enough biomass to allow anammox activity
even at 10 °C. Even though there was a minor nitrite-build up
when the temperature dropped below 12.5 °C, reactor performance
recovered as the temperature decrease continued. Microbial community
analysis by 16S rRNA amplicon analysis revealed a relatively stable
community composition over the entire experimental period.
2014-08-05 00:00:00
MBBR
gN
Bed Biofilm Reactor
16 S rRNA amplicon analysis
temperature decrease
Low Strength WastewaterMunicipal wastewater
Microbial community analysis
bed biofilm reactor