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Author:

Wei, Ziqing (Wei, Ziqing.) | Li, Dong (Li, Dong.) | Li, Shuai (Li, Shuai.) | Zeng, Huiping (Zeng, Huiping.) | Zhang, Jie (Zhang, Jie.) (Scholars:张杰)

Indexed by:

Scopus SCIE

Abstract:

In this study, the filamentous bulking (FB) with moderate and excessive levels were demonstrated to induce anammox failure by inhibiting nitrogen (N) removal and biomass retention. The low external mass transfer resulted from high liquid-surface friction and low turbulence of filamentous surface was considered the "trigger" of anammox failure, which decreased flux of nitrogen flow toward granular surface and directly limited Nremoval loading, which meanwhile exposed granules with N-scarcity environment and indirectly inhibited Nremoval bio-activity. Low bio-activity performed poor extracellular polymeric substances secretion further destroyed bio-aggregation with low suface hydrophobicity, which acted as "accelerator" for granule disintegration and biomass washout, ultimatly leading to anammox failure. Fortunately, incresing hydraulic shear stress could eradicate FB's negative effects without inhibiting FB itself, which promoted re-granulation and N-remval restore by enhancing external mass transfer more than hydraulic detachment. Enhancing mechanical stirring with FB level was necessary to maintain stable operation of granular anammox system.

Keyword:

Rheological properties Surface thermodynamics Mass transfer Boundary layer thickness Hydraulic shear stress

Author Community:

  • [ 1 ] [Wei, Ziqing]Beijing Univ Technol, Key Lab Water Sci & Water Environm Recovery Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Li, Dong]Beijing Univ Technol, Key Lab Water Sci & Water Environm Recovery Engn, Beijing 100124, Peoples R China
  • [ 3 ] [Li, Shuai]Beijing Univ Technol, Key Lab Water Sci & Water Environm Recovery Engn, Beijing 100124, Peoples R China
  • [ 4 ] [Zeng, Huiping]Beijing Univ Technol, Key Lab Water Sci & Water Environm Recovery Engn, Beijing 100124, Peoples R China
  • [ 5 ] [Zhang, Jie]Harbin Inst Technol, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China

Reprint Author's Address:

  • [Li, Dong]Beijing Univ Technol, Key Lab Water Sci & Water Environm Recovery Engn, Beijing 100124, Peoples R China

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Source :

BIORESOURCE TECHNOLOGY

ISSN: 0960-8524

Year: 2024

Volume: 395

1 1 . 4 0 0

JCR@2022

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 2

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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