Applications of Anammox based processes to treat anaerobic digester supernatant at room temperature.
The supernatant of an anaerobic digester was treated at 20 degrees C in two systems. The first one is a two units configuration, conformed by two sequencing batch reactors (SBR), carrying out partial nitrification and Anammox processes, respectively. Partial nitrification was achieved by granular biomass with a mean diameter of 3 mm, operating at a dissolved oxygen concentration of 2.7 mg/L. The combined system allowed the removal of nitrogen loading rates around 0.08 g N/(Ld). Afterwards, Anammox biomass was spontaneously developed in the inner core of the nitrifying granules of the SBR and therefore, partial nitrification and Anammox process were carried out in a single unit. Once the stable CANON process was established, a mean nitrogen removal rate of 0.8 g N/(Ld) was registered. The settling velocities of the granules ranged from 70 to 150 m/h with sludge volumetric index values lower than 50 mL/g VSS during the whole operation.
Vázquez-Padín
Jose
J
Department of Chemical Engineering, University of Santiago de Compostela, Lope Gómez de Marzoa, s/n, E-15782, Santiago de Compostela, A Coruna, Spain. jose.vazquez.padin@usc.es
Fernádez
Isaac
I
Figueroa
Mónica
M
Mosquera-Corral
Anuska
A
Campos
Jose-Luis
JL
Méndez
Ramón
R
D001421:Bacteria, Anaerobic / Q000378:metabolism*; D019149:Bioreactors / Q000382:microbiology*; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008954:Models, Biological; D009584:Nitrogen / Q000302:isolation & purification / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013696:Temperature
D009584:Nitrogen; D010100:Oxygen