Journal
BIORESOURCE TECHNOLOGY
Volume 336, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125317
Keywords
Anammox granular sludge; Extracellular polymeric substance; Protein; polysaccharide ratio; Gene functions; Microbial community network
Funding
- Postdoctoral Research Foundation of China [2020 M671624]
- State Key Laboratory of Pollution Control and Resource Reuse [PCRRF18032, 20011]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [19KJD610004]
- Engineering Laboratory of Technology and Equipment of Water Environmental Protection of Jiangsu Province [W1905]
- Natural Science Foundation of China [52070160]
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The study found that AnGS with a diameter of 0.5-1.0 mm had the highest specific anammox activity, while those with a diameter of 1.0-1.5 mm might lead to better nitrogen removal efficiency. The content of slime EPS and SAA showed a positive correlation, while the protein/polysaccharide ratio of slime EPS and sludge volume index showed a negative correlation. AnGS with a diameter of 0.5-1.0 mm exhibited higher energy metabolism.
In this study, an integrated investigation to the microbial activities, extracellular polymeric substance (EPS), microbial community and function of anammox granular sludge (AnGS) was performed. Results showed that AnGS at 0.5-1.0 mm had the highest average specific anammox activity (SAA) of 345.9 mg NH4+-NgVSS-1d-1, but AnGS at 1.0-1.5 mm with higher SAA might lead to better nitrogen removal efficiency. The content of slime EPS and SAA achieved positively correlation with R2 of 98.11%, while protein/polysaccharide ratio of slime EPS and sludge volume index achieved negatively correlation with R2 of 99.13%. Cadidatus Broccadia and Denitratisoma were positive correlations and most abundant in AnGS 0.5-1.0 mm of 20% and AnGS 1.0-1.5 mm of 37%, respectively. AnGS at 0.5-1.0 mm exhibited higher energy metabolism which mostly contributed to produce protein. The study provides new insights into the mechanisms of AnGS about 1 mm playing more important role in nitrogen removal performance.
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