Short operational differences support granulation in a lab scale reactor in comparison to another conventional activated sludge reactor

Sunayna Dasgupta, Haydee De Clippeleir, Ramesh Goel

Research output: Contribution to journalArticle

Abstract

This study explains how small operational differences support excellent granulation in aerobic granular reactors. Short settling time promoted granulation in AGS reactor. Gene expressions based on mRNA revealed much higher ammonium monooxygenase (amoA) in conventional reactor biomass than in the aerobic granular reactor (AGS) biomass during a complete cycle operation. The number of glycogen accumulating organisms in conventional was much higher than in the granular reactor. The denitrifying functional genes in the granular systems were upregulated in anaerobic and aerobic phases. The granular reactor removed 1.84 kg COD-m−3day−1, 0.09 kg NH4 +-N-m−3day−1, and 0.063 kg PO4 3—P-m−3day−1. The conventional reactor removed 1.14 Kg-m−3day−1 COD, 0.05 kg-m−3day−1 NH4 +-N, and 0.028 kg-m−3day−1 PO4 3−-P. The granular reactor showed faster kinetics for nutrient and organics removal compared to the conventional reactor. Flocs in the conventional reactor had a lower abundance of Candidatus accumulibacter sp. and higher relative abundance of Candidatus competibacter.

LanguageEnglish (US)
Pages417-426
Number of pages10
JournalBioresource Technology
Volume271
DOIs
StatePublished - Jan 1 2019

Fingerprint

granular medium
laboratory method
pollutant removal
Granulation
Denitrification
Enzyme activity
Bioreactors
oxic conditions
Ammonium Compounds
Gene expression
bioreactor
gene expression
enzyme activity
activated sludge
denitrification
comparative study
Bacteria
Biomass
ammonium
bacterium

Keywords

  • Candidatus accumulibacter sp.
  • Candidatus competibacter
  • Compact granules
  • Filamentous bacteria
  • Nitrification and denitrification
  • Pulse mode feeding

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

Cite this

Short operational differences support granulation in a lab scale reactor in comparison to another conventional activated sludge reactor. / Dasgupta, Sunayna; De Clippeleir, Haydee; Goel, Ramesh.

In: Bioresource Technology, Vol. 271, 01.01.2019, p. 417-426.

Research output: Contribution to journalArticle

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