AI Article Synopsis
- The study examined how bacterial communities change during aerobic granulation processes, particularly focusing on nitrifiers and the influence of different wastewater types using advanced sequencing techniques.
- It found a significant decrease in bacterial diversity after granulation, with the bacterial structure of the resulting aerobic granular sludge (AGS) being quite different from the original seed sludge.
- Notably, minor bacterial genera from the seed sludge became dominant in AGS, suggesting they play a vital role in the granulation process, while many dominant genera from the seed sludge declined or vanished.
Article Abstract
Shifts in bacterial community composition and abundance of nitrifiers during aerobic granulation, and the effects of wastewater composition on them were investigated using Illumina sequencing and quantitative PCR. The bacterial diversity decreased sharply during the post-granulation period. Although cultivated with different wastewater types, aerobic granular sludge (AGS) formed with similar bacterial structure. The bacterial structure in AGS was completely different from that of seed sludge. The minor genera in seed sludge, e.g., Arcobacter, Aeromonas, Flavobacterium and Acinetobacter, became the dominant genera in AGS. These genera have the potential to secrete excess extracellular polymer substances. Whereas, the dominant genera in seed sludge were found in less amount or even disappeared in AGS. During aerobic granulation, ammonia-oxidizing archaea were gradually washed-out. While, ammonia-oxidizing bacteria, complete ammonia oxidizers and nitrite-oxidizing bacteria were retained. Overall, in this study, the bacterial genera with low relative abundance in seed sludge are important for aerobic granulation.
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| http://dx.doi.org/10.1016/j.biortech.2017.12.038 | DOI Listing |
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