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  • Spatial difference in nitro...
    Wang, Ying; Zhang, Zikun; Jiang, Yushi; Cao, Wenzhi; Lin, Jih-Gaw; Zhang, Yanlong

    The Science of the total environment, 01/2024, Letnik: 907
    Journal Article

    The start-up of a relatively high nitrogen load PD/Anammox in an EGSB reactor was achieved through strategies of bioaugmentation, mass transfer enhancement, and COD/NO3−-N control, with NRR of 5.2 g N/L/d. Longitudinal heterogeneity in EGSB reactor induced divergent nitrogen conversion pathways and enriched different functional microorganisms between stratified sludge. Along the elevation of the reactor, the proportion of removed nitrogen through anammox increased continuously from bottom, middle and up, which were 65.0 %, 79.8 %, and 84.1 %, respectively, consistent with the trend of ex-situ activities calculated with Gompertz model. The bottom zone played a role in mixed nitrogen conversion to provide NO2−-N accumulation and nitrogen removal, with higher abundance of Thauera, Denitratisoma and Ignavibacterium. The middle part was enriched Candidatus_Kuenenia (12.51 %), and up inhibited completed denitrification, together forming the anammox dominant zone. The proposed functional zones in the EGSB reactor provided approaches for the optimisation of high-load PD/Anammox systems. Display omitted •Functional zones of PD/Anammox in EGSB reactor was explored for the first time.•Bottom zone contributed the highest removal as mixed nitrogen conversion zone.•Candidatus Kuenenia was enriched in the middle zone (12.51 %).•The lack of COD inhibited completed denitrification in the up zone.•Proportion of removed nitrogen through anammox increased along the elevation.