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

5 Citations (Scopus)

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) O 2-AS effluent DOC is more refractory than air-AS effluent DOC; and (b) O 2-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 O 2- 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

Fingerprint

activated sludge
Batch reactors
Organic carbon
dissolved organic carbon
Oxygen
oxygen
air
effluents
Effluents
Air
effluent
wastewater treatment
Wastewater treatment
biochemical oxygen demand
Biochemical oxygen demand
Sewage sludge
Refractory materials
reactor
comparison
Gases

Keywords

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

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry
  • Aquatic Science
  • Water Science and Technology

Cite this

Comparison of dissolved-organic-carbon residuals from air- and pure-oxygen-activated-sludge sequencing-batch reactors. / Esparza-Soto, Mario; Fox, Peter; Westerhoff, Paul.

In: Water Environment Research, Vol. 78, No. 3, 03.2006, p. 321-329.

Research output: Contribution to journalArticle

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