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Articles

Metabolic Traits of Candidatus Accumulibacter clade IIF Strain SCELSE-1 Using Amino Acids As Carbon Sources for Enhanced Biological Phosphorus Removal

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By Xianghui Liu, Yingyu Law, Guanglei Qiu, Rogelio Zuniga-Montanez
| American Chemical Society
Despite recent evidence from full-scale plants suggesting that Candidatus Accumulibacter may be capable of using amino acids, this metabolic trait has never been confirmed in a bioreactor experiment. Here we show that an enriched culture of Ca. Accumulibacter clade IIF strain SCELSE-1 could metabolize 11 of 20 α-amino acids, with aspartate, glutamate, asparagine, and glutamine resulting in the highest phosphorus removal.
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High Dissolved Oxygen Selection against Nitrospira Sublineage I in Full-Scale Activated Sludge

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By Yingyu Law, Artur Matysik, Xueming Chen, Sara Swa Thi
| American Chemical Society
A single Nitrospira sublineage I OTU was found to perform nitrite oxidation in full-scale domestic wastewater treatment plants (WWTPs) in the tropics. This taxon had an apparent oxygen affinity constant lower than that of the full-scale domestic activated sludge cohabitating ammonium oxidizing bacteria (AOB) (0.09 ± 0.02 g O2 m–3 versus 0.3 ± 0.03 g O2 m–3). Thus, nitrite oxidizing bacteria (NOB) may in fact thrive under conditions of low oxygen supply.
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