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 language | English (US) |
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Pages (from-to) | 321-329 |
Number of pages | 9 |
Journal | Water Environment Research |
Volume | 78 |
Issue number | 3 |
DOIs | |
State | Published - 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