Influence of dissolved oxygen concentration on the start-up of the anammox-based process: ELAN

The anammox-based process ELAN® was started-up in two different sequencing batch reactor (SBR) pilot plant reactors treating municipal anaerobic digester supernatant. The main difference in the operation of both reactors was the dissolved oxygen (DO) concentration in the bulk liquid. SBR-1 was start...

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Bibliographic Details
Published in:Water science and technology 2015-01, Vol.72 (4), p.520-527
Main Authors: Morales, N, Val del Río, A, Vázquez-Padín, J R, Gutiérrez, R, Fernández-González, R, Icaran, P, Rogalla, F, Campos, J L, Méndez, R, Mosquera-Corral, A
Format: Article
Language:English
Subjects:
Ammonia
Ammonia - metabolism
Ammonia-oxidizing bacteria
Anaerobic treatment
Anaerobiosis
Bacteria
Bacteria - metabolism
Batch reactors
Biomass
Bioreactors
Bioreactors - microbiology
Chemical oxygen demand
Dissolved oxygen
Fixed bed reactors
Granular materials
Microorganisms
Nitrogen - metabolism
Nitrogen removal
Oxidation
Oxidation-Reduction
Oxygen
Oxygen - metabolism
Reactors
Removal
Science
Sequencing batch reactor
Sewage - analysis
Sludge
Waste Disposal, Fluid
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Summary:The anammox-based process ELAN® was started-up in two different sequencing batch reactor (SBR) pilot plant reactors treating municipal anaerobic digester supernatant. The main difference in the operation of both reactors was the dissolved oxygen (DO) concentration in the bulk liquid. SBR-1 was started at a DO value of 0.4 mg O2/L whereas SBR-2 was started at DO values of 3.0 mg O2/L. Despite both reactors working at a nitrogen removal rate of around 0.6 g N/(L d), in SBR-1, granules represented only a small fraction of the total biomass and reached a diameter of 1.1 mm after 7 months of operation, while in SBR-2 the biomass was mainly composed of granules with an average diameter of 3.2 mm after the same operational period. Oxygen microelectrode profiling revealed that granules from SBR-2 where only fully penetrated by oxygen with DO concentrations of 8 mg O2/L while granules from SBR-1 were already oxygen penetrated at DO concentrations of 1 mg O2/L. In this way granules from SBR-2 performed better due to the thick layer of ammonia oxidizing bacteria, which accounted for up to 20% of all the microbial populations, which protected the anammox bacteria from non-suitable liquid media conditions.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2015.233