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Author:

Liu, Wenlong (Liu, Wenlong.) | Li, Jun (Li, Jun.) | Lu, Huijie (Lu, Huijie.) | Peng, Yongzhen (Peng, Yongzhen.)

Indexed by:

EI Scopus SCIE

Abstract:

Strengthening the activity competitiveness of anaerobic ammonium oxidation (anammox) bacteria (AnAOB) under low nitrogen conditions is indispensable for mainstream anammox application. This study demonstrates that sponge iron addition (42.8 g/L) effectively increased apparent AnAOB activity and extracellular polymeric substance (EPS) production of low load anammox biofilms cultivated under low (influent of 60 mg N/L) and even ultra -low (influent of 10 mg N/L) nitrogen conditions. In -situ batch tests showed that after sponge iron addition the specific AnAOB activity in the low and ultra -low nitrogen systems further increased to 1.18 and 0.47 mmol/g VSS/h, respectively, with an apparent growth rate for AnAOB of 0.011 +/- 0.001 d-1 and 0.004 +/- 0.001 d-1, respectively. The averaged EPS concentration of anammox biofilm in both low (from 35.84 to 71.05 mg/g VSS) and ultra -low (from 44.14 to 57.59 mg/g VSS) nitrogen systems increased significantly, while a higher EPS protein/polysaccharide ratio, which was positively correlated with AnAOB activity, was observed in the low nitrogen system (3.54 +/- 0.34) than that in the ultra -low nitrogen system (1.82 +/- 0.10). In addition, Candidatus Brocadia was detected as dominant AnAOB in the anammox biofilm under the low (12.2 %) and ultra -low (24.7 %) nitrogen condition. Notably, the genus Streptomyces (26.3 %), capable for funge-like codenitrification, increased unexpectedly in the low nitrogen system, but not affecting the nitrogen removal performance. Therefore, using sponge iron to strengthen AnAOB activity under low nitrogen conditions is feasible, providing support for mainstream anammox applications.

Keyword:

Anammox Biofilm Microbial community Sponge iron Substrate concentrations

Author Community:

  • [ 1 ] [Liu, Wenlong]Zhejiang Univ Technol, Coll Environm, Hangzhou 310014, Peoples R China
  • [ 2 ] [Li, Jun]Zhejiang Univ Technol, Coll Environm, Hangzhou 310014, Peoples R China
  • [ 3 ] [Lu, Huijie]Zhejiang Univ, Coll Environm Resource Sci, Key Lab Environm Remediat & Ecol Hlth, Minist Educ, Hangzhou 310058, Peoples R China
  • [ 4 ] [Peng, Yongzhen]Beijing Univ Technol, Natl Engn Lab Adv Municipal Wastewater Treatment &, Beijing 100124, Peoples R China
  • [ 5 ] [Li, Jun]Zhejiang Univ Technol, Hangzhou 310014, Peoples R China

Reprint Author's Address:

  • [Li, Jun]Zhejiang Univ Technol, Hangzhou 310014, Peoples R China

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Source :

JOURNAL OF ENVIRONMENTAL MANAGEMENT

ISSN: 0301-4797

Year: 2024

Volume: 355

8 . 7 0 0

JCR@2022

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 3

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 0

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