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

Mario Esparza-Soto; Peter Fox; Paul Westerhoff

doi:10.2175/106143005X94411

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 journal › Article › peer-review

8 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 language	English (US)
Pages (from-to)	321-329
Number of pages	9
Journal	Water Environment Research
Volume	78
Issue number	3
DOIs	https://doi.org/10.2175/106143005X94411
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

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10.2175/106143005X94411

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@article{e792de12ef5a498ba41514997a67773b,

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

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.",

keywords = "Air-activated sludge, Dissolved-organic carbon, Extracellular polymers, Molecular-weight distribution, Pure-oxygen-activated sludge",

author = "Mario Esparza-Soto and Peter Fox and Paul Westerhoff",

year = "2006",

month = mar,

doi = "10.2175/106143005X94411",

language = "English (US)",

volume = "78",

pages = "321--329",

journal = "Water Environment Research",

issn = "1061-4303",

number = "3",

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T1 - Comparison of dissolved-organic-carbon residuals from air- and pure-oxygen-activated-sludge sequencing-batch reactors

AU - Esparza-Soto, Mario

AU - Fox, Peter

AU - Westerhoff, Paul

PY - 2006/3

Y1 - 2006/3

N2 - 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.

AB - 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.

KW - Air-activated sludge

KW - Dissolved-organic carbon

KW - Extracellular polymers

KW - Molecular-weight distribution

KW - Pure-oxygen-activated sludge

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JO - Water Environment Research

JF - Water Environment Research

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ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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