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Enrichment of Anammox Biomass During Mainstream Wastewater Treatment Driven by Achievement of Partial Denitrification Through the Addition of Bio-carriers by Yuqing Ma; Bo Wang; Xiaodi Li; Shuo Wang; Wen Wang; Yongzhen Peng is a Environmental Science article available to read on EtoBox.

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Anammox is widely considered as the most cost-effective and sustainable process for nitrogen removal. However, how to achieve the enrichment of anammox biomass remains a challenge for its large-scale application, especially in mainstream wastewater treatment.In this study, the feasibility of enrichment of anammox biomass was explored through the realization of partial denitrification and the addition of bio-carriers. By using ordinary activated sludge, a sequencing batch reactor (SBR) followed by an up-flow anaerobic sludge bed (UASB) was operated at 25 ± 2 °C for 214 days. The long-term operation was divided into five phases, in which SBR and UASB were started-up in Phases I and II, respectively. By eliminating oxygen and adjusting the inflow ratios in Phases III-V, advanced nitrogen removal was achieved with the effluent total nitrogen being 4.7 mg/L and the nitrogen removal efficiency being 90.5% in Phase V. Both in-situ and ex-situ activity tests demonstrated the occurrence of partial denitrification and anammox. Moreover, 16S rRNA high-throughput sequencing analysis revealed that Candidatus Brocadia was enriched from below the detection limit to in biofilms (0.4% in SBR, 2.2%

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Author

Yuqing Ma; Bo Wang; Xiaodi Li; Shuo Wang; Wen Wang; Yongzhen Peng

Publisher

Elsevier BV

Published

2024

Language

EN

Field

Environmental Science (Physical Sciences)