Feast/famine ratio regulates the succession of heterotrophic nitrification-aerobic denitrification and autotrophic ammonia oxidizing bacteria in halophilic aerobic granular sludge treating saline wastewater

[Display omitted] •The HAGS system achieved 100 % aerobic TIN removal with F/F ratio = 1/9.•High TIN removal was achieved via HN-AD.•The F/F ratio regulated the succession of HN-AD bacteria and autotrophic AOB.•The integration of AGS was dependent on abundance of HN-AD bacteria.•Paracoccus sp. is th...

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Published in:Bioresource technology 2024-02, Vol.393, p.129995-129995, Article 129995
Main Authors: Sui, Yuan, Cui, You-Wei, Huang, Ji-Lin, Xu, Meng-Jiao
Format: Article
Language:English
Subjects:
Aerobiosis
Ammonia
Autotrophic ammonia oxidizing bacteria
Bacteria - genetics
Betaproteobacteria
Bioreactors
Denitrification
Feast/famine ratio
Halophilic aerobic granular sludge
Heterotrophic nitrification-aerobic denitrification
Heterotrophic Processes
Microbial competition
Nitrification
Nitrogen
Oxidation-Reduction
Sewage - microbiology
Wastewater
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Summary:[Display omitted] •The HAGS system achieved 100 % aerobic TIN removal with F/F ratio = 1/9.•High TIN removal was achieved via HN-AD.•The F/F ratio regulated the succession of HN-AD bacteria and autotrophic AOB.•The integration of AGS was dependent on abundance of HN-AD bacteria.•Paracoccus sp. is the functional HN-AD bacteria. Heterotrophic nitrification-aerobic denitrification (HN-AD) shows innovation potential of wastewater treatment process in a single tank. However, how to enrich HN-AD bacteria in activated sludge to enhance their contribution remained unknown. This study explored the impact of the feast/famine (F/F) ratio on the succession of autotrophic ammonia oxidizing bacteria (AOB) and HN-AD bacteria in a halophilic aerobic granular sludge (HAGS) system. As the F/F ratio decreased from 1/9 to 1/15, the total inorganic nitrogen (TIN) removal performance significantly decreased. The proportion of heterotrophic bacteria was dropped from 79.0 % to 33 %. Accordingly, the relative abundance of Paracoccus decreased from 70.8 % to 25.4 %, and the copy number of the napA gene was reduced from 2.2 × 1010 copies/g HAGS to 8.1 × 109 copies/g HAGS. It found the F/F ratio regulated the population succession of autotrophic AOB and HN-AD bacteria, thereby providing a solution to achieve the enrichment of HN-AD bacteria in HAGS.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2023.129995