Microbial activity balance in size fractionated suspended growth biomass from full-scale sidestream combined nitritation-anammox reactors

Yijing Shi, George Wells*, Eberhard Morgenroth

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

The purpose of this study was to determine the abundance, distribution and activity of aerobic ammonia-oxidizing bacteria (AOB) and anammox in size fractionated aggregates from full-scale suspended growth combined nitritation-anammox sidestream reactors. Plants with or without a cyclone device were also studied to assess a purported enrichment of anammox granules. Specific aerobic ammonium oxidation rates (p = 0.01) and specific oxygen uptake rates (p = 0.02) were significantly greater in flocs than in granules. AOB abundance measured using quantitative FISH was significantly higher in flocs than in granules (p = 0.01). Conversely, anammox abundance was significantly greater in granules (p = 0.03). The average ratio of anammox/AOB in systems employing hydrocyclone separation devices was 2.4, significantly higher (p = 0.02) than the average ratio (0.5) in a system without a hydrocyclone. Our results demonstrate substantial functional and population-level segregation between floccular and granular fractions, and provide a key corroboration that cyclone separation devices can increase anammox levels in such systems.

Original languageEnglish (US)
Pages (from-to)38-45
Number of pages8
JournalBioresource Technology
Volume218
DOIs
StatePublished - Oct 1 2016

Keywords

  • AOB
  • Anammox
  • Flocs
  • Granular sludge
  • Hydrocyclone

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Microbial activity balance in size fractionated suspended growth biomass from full-scale sidestream combined nitritation-anammox reactors'. Together they form a unique fingerprint.

Cite this