Microbial structure and nitrogen compound conversions in aerobic granular sludge reactors with non-aeration phases and acetate pulse feeding.
A technological system was developed for efficient nitrogen removal from real digester supernatant in a single reactor with shortened aeration to increase the economical aspects of wastewater treatment. The supernatant (600 mg TKN/L, low COD/N ratio of 2.2) was treated in batch reactors with aerobic granules (GSBRs) to test how one, two, or three non-aeration phases and acetate pulse feeding in the cycle affect the morphological and microbial properties of biomass. Introduction of one non-aeration phase in the cycle increased nitrogen removal efficiency by 11 % in comparison with constantly aerated GSBR. The additional non-aeration phases did not diminish the efficiency of ammonia oxidation but did favor nitrification to nitrate. Acetate pulse feeding in the reactor with three non-aeration phases raised the efficiency of nitrogen removal to 77 %; in parallel, the number of denitrifiers possessing nosZ genes and performing denitrification to N2increased. Ammonia was oxidized by aerobic and anaerobic ammonia-oxidizing bacteria and heterotrophic nitrifiers (Pseudomonas sp. and Alcaligenes faecalis) that coexisted in granules. Azoarcus sp., Rhizobium sp., and Thauera sp. were core genera of denitrifiers in granules. An increase in the number of non-aeration phases diminished EPS content in the biomass and granule diameters and increased granule density.
University of Warmia and Mazury in Olsztyn, Słoneczna 45G, 10-709, Olsztyn, Poland. agnieszka.cydzik@uwm.edu.pl.
Agnieszka
A
Cydzik-Kwiatkowska
University of Warmia and Mazury in Olsztyn, Słoneczna 45G, 10-709, Olsztyn, Poland.
Paulina
P
Rusanowska
University of Warmia and Mazury in Olsztyn, Słoneczna 45G, 10-709, Olsztyn, Poland.
Magdalena
M
Zielińska
University of Warmia and Mazury in Olsztyn, Słoneczna 45G, 10-709, Olsztyn, Poland.
Katarzyna
K
Bernat
University of Warmia and Mazury in Olsztyn, Słoneczna 45G, 10-709, Olsztyn, Poland.
Irena
I
Wojnowska-Baryła
D000085:Acetates / Q000378:metabolism; D000332:Aerobiosis; D019149:Bioreactors; D017672:Nitrogen Compounds / Q000032:analysis / Q000737:chemistry; D012722:Sewage / Q000032:analysis / Q000737:chemistry; D014865:Waste Disposal, Fluid
D000085:Acetates; D017672:Nitrogen Compounds; D012722:Sewage
Aerobic granules; Anammox bacteria; Anoxic phases; Low COD/N; amoA; nirK; nirS; nosZ
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