Journal
BIORESOURCE TECHNOLOGY
Volume 393, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2023.129995
Keywords
Autotrophic ammonia oxidizing bacteria; Feast/famine ratio; Halophilic aerobic granular sludge; Heterotrophic nitrification-aerobic denitrification; Microbial competition
Ask authors/readers for more resources
The feast/famine ratio was found to regulate the population succession of autotrophic ammonia oxidizing bacteria (AOB) and heterotrophic nitrification-aerobic denitrification (HN-AD) bacteria, providing a solution for enriching HN-AD bacteria in halophilic aerobic granular sludge (HAGS) systems.
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 x 10(10) copies/g HAGS to 8.1 x 10(9) 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available