Mainstream anammox reactor performance treating municipal wastewater and batch study of temperature, pH and organic matter concentration cross-effects

[Display omitted] The anammox process is an energy efficient promising alternative to biologically remove the nitrogen. Thus, a 5-L anammox granular reactor was inoculated with sludge coming from a sidestream partial nitritation and anammox reactor (>200 mg TN/L and 30 °C) and it was directly sub...

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Bibliographic Details
Published in:Process safety and environmental protection 2021-01, Vol.145, p.195-202
Main Authors: Pedrouso, Alba, Val del Rio, Angeles, Morales, Nicolas, Vazquez-Padin, Jose R., Campos, Jose Luis, Mosquera-Corral, Anuska
Format: Article
Language:English
Subjects:
Acclimation
Acclimatization
Alkalinity
Alternative energy sources
Autotrophic nitrogen removal
Energy efficiency
Inorganic carbon
Low temperature
Mainstream
Municipal wastewater
Nitrogen removal
Organic matter
pH effects
Reactors
Sludge
Specific anammox activity
Stability
Stability augmentation
Temperature
Wastewater treatment
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Summary:[Display omitted] The anammox process is an energy efficient promising alternative to biologically remove the nitrogen. Thus, a 5-L anammox granular reactor was inoculated with sludge coming from a sidestream partial nitritation and anammox reactor (>200 mg TN/L and 30 °C) and it was directly subjected to 15 ± 1 °C treating mimicked municipal wastewater (50 mg TN/L). Results indicated that an acclimation period (commonly used) to progressive reach the mainstream conditions is not needed, shortening the start-up periods. The long-term anammox process stability was proved to treat synthetic wastewater with decreasing alkalinities and nitritified primary settled municipal wastewater. The low pH values (6.2 ± 0.1) of the municipal wastewater fed did not affect the process stability. Residual organic matter concentrations augmented the nitrogen removal efficiency from 80 % (with the synthetic medium) to 92 % achieving effluent concentrations below 10 mg TN/L. Finally, the effect of pH (6–8), temperature (15–30 °C) and organic matter concentration (0–75 mg TOC/L) over the specific anammox activity (SAAMX) was evaluated at short-term. pH and temperature and their interactions exerted significant influence on the SAAMX value while the TOC concentrations itself did not significantly change the SAAMX.
ISSN:0957-5820
1744-3598
DOI:10.1016/j.psep.2020.07.052