Comparison of dissolved-organic-carbon residuals from air- and pure-oxygen-activated-sludge sequencing-batch reactors

Mario Esparza-Soto, Peter Fox, Paul Westerhoff

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Literature shows that full-scale pure-oxygen activated sludge (O 2-AS) wastewater treatment plants (WWTPs) generate effluents with higher dissolved-organic carbon (DOC) concentrations and larger high-molecular-weight fractions compared to air-activated-sludge (Air-AS) WWTP effluents. The purpose of this paper was to evaluate how gas supplied (air vs. pure oxygen) to sequencing-batch reactors affected DOC transformations. The main conclusions of this paper are (a) O2-AS effluent DOC is more refractory than air-AS effluent DOC; and (b) O2-AS systems may have higher five-day biochemical oxygen demand removals than air-AS systems; however, in terms of COD and DOC removal, air-AS systems are better than O 2-AS systems. Analysis of a database from side-by-side O2- and air-AS pilot tests from literature supported these observations.

Original languageEnglish (US)
Pages (from-to)321-329
Number of pages9
JournalWater Environment Research
Volume78
Issue number3
DOIs
StatePublished - Mar 2006

Keywords

  • Air-activated sludge
  • Dissolved-organic carbon
  • Extracellular polymers
  • Molecular-weight distribution
  • Pure-oxygen-activated sludge

ASJC Scopus subject areas

  • Environmental Chemistry
  • Ecological Modeling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

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