In-Situ Enrichment of Copiotrophic Ammonia-Oxidizing Archaea in Aerated Biofilters with Different Diffusion Paths by Means of Substrate Limitation

Опубликована: Янв. 1, 2024

Ammonia-oxidizing archaea (AOA) are widely dispersed in wastewater treatment systems and have a significant role the oxidation of ammonia-nitrogen. Compared to ammonia oxidizing bacteria (AOB), AOA wide range affinity for ammonia, higher oxygen more resistant low temperatures, thus they great potential replace AOB mainstream treatment. However, limited efforts been made in-situ enrich this process. To end, activity was restricted by limiting availability ammonia-nitrogen through stepwise decrease gas-water ratio while increasing hydraulic loading maintaining high influent concentration (40.91 ± 7.61 mg/L) two different aerated biofilters (BAFs: substrate co-diffusion upflow-BAF (R1), counter-diffusion downflow-BAF (R2)). This resulted polysaccharide production dense biofilm structure, predominance copiotrophic Nitrosocosmicus Nitrososphaera (R1: 99.18%; R2: 99.83%) with nitrification efficiency 99.19±0.15%; 96.49±0.47%). The dominance species may be related residual at BAF heights, promoting expression glutamine synthetase-glutamate synthase pathway genes. amoA-AOA/AOB gene abundance R2 than R1. rate richness lower oligotrophic Candidatus Nitrosotenuis aquarius viennensis were enriched only R1, which explain removal. In addition, shown key contributor removal inhibition experiments both reactors. efficient situ enrichment offers promise opportunity promote its application wastewater.

Язык: Английский

Enhanced anammox cultivation using mixed sludge and optimized nitrite- ammonium ratio

Journal of Water Process Engineering, Год журнала: 2024, Номер 69, С. 106694 - 106694

Опубликована: Дек. 9, 2024

Язык: Английский