In this study, autotrophic denitrification process was successfully coupled with anammox to remove the by-product nitrate by electrochemical technology. When the voltage applied in combined electrode reactor was 1.5 V, the electrode reaction could remove the nitrate by autotrophic denitrification biomass but not affect the anammox biomass. The nitrogen removal efficiency of combined electrode reactor reached 99.1% without detectable nitrate at the influent NO2--N/NH4+-N ratio of 1.5. On day 223 by the model calculation based on stoichiometric equations, 19.7% of total nitrogen was removed through autotrophic denitrification process, while the majority of nitrogen removal about 79.4% was attributed to the anammox reaction. The small variations of the population numbers and community structure of artificial bacterioflora by electron microscope observation predicted that the anammox and autotrophic denitrifying biomass could be coexisted in the electrode reactor. 16S rRNA analysis determined that anammox biomass group has always been dominant in the mixed flora during continuous cultivating.

Integrating anammox with autotrophic denitrification process by electrochemistry technology

255th National Meeting (2018)

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