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Bioresour Technol. 2019 Jan;271:258-265. doi: 10.1016/j.biortech.2018.09.119. Epub 2018 Sep 24.

Impact of carbon to nitrogen ratio on the performance of aerobic granular reactor and microbial population dynamics during aerobic sludge granulation.

Author information

1
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
2
College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China.
3
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China. Electronic address: jingkanghit@163.com.

Abstract

Carbon to nitrogen (C/N) ratio is one of the most important factor affecting aerobic granular sludge (AGS) growth and pollutant removal in aerobic granular sludge sequencing batch reactor (AGSBR). For stability of sludge granulation process, AGSs were domesticated in five sequence batch reactors (SBRs) with different C/N ratios (6, 7, 8, 9, and 10), which the ammonia nitrogen concentration of influent was 165 mg/L. The effects of C/N ratio on morphology and property of AGS were studied. The results showed that stable AGS was yielded with good settleability, high pollutant removal efficiency and rich microbial diversity when C/N ratio was 8. AGS yielded had stable structure due to higher protein in extracellular polymeric substances (EPS). High throughput 16S rDNA gene analysis revealed the microbial community diversity increased in AGS under the C/N ratio. The dominant microbes changed at the phylum, class and family three levels with the increasing operation time.

KEYWORDS:

Aerobic granular sludge; Carbon to nitrogen ratio; Decontamination efficiency; Microbial community; Sequencing batch reactor

PMID:
30278350
DOI:
10.1016/j.biortech.2018.09.119
[Indexed for MEDLINE]

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