Oxygen Transfer Parameter Estimation: Impact of Methodology.

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Bibliographic Details
Title:	Oxygen Transfer Parameter Estimation: Impact of Methodology.
Authors:	Jiang, Pan¹, Stenstrom, Michael K.² stenstro@seas.ucla.edu
Source:	Journal of Environmental Engineering. Feb2012, Vol. 138 Issue 2, p137-142. 6p. 1 Chart, 5 Graphs.
Subjects:	Activated sludge process, Characterization of sewage sludge, Reactive oxygen species, Sewage disposal plants, Energy consumption, Environmental engineering, Parameter estimation
Abstract:	Oxygen transfer is an important part of wastewater treatment and accounts for as much as 60% of energy consumption in the activated sludge process. Prior to 1984, no standard method for quantifying oxygen transfer existed, which created problems in the design and warranties for treatment plants. The ASCE standards for the measurement of oxygen transfer in clean water and the Standard Guidelines for In-Process Oxygen Transfer Testing have found widespread application and have reduced design variability. The standard has allowed operators and engineers to better evaluate process operation of existing treatment plants. This paper illustrates the key concepts of the standard and shows why they are important and how they reduce the variability of oxygen transfer testing. The reasons for the standard's success are described, as are the pitfalls of earlier approaches. The paper also highlights key new areas of the revised clean water standard, including an optional correction for test water total dissolved solids concentration and applications to the loop (ditch) activated sludge process and the high-purity-oxygen activated sludge process. Finally an analysis is presented that shows how numerical treatment of the transfer data minimizes the impact of gas-side oxygen depletion. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	Oxygen transfer is an important part of wastewater treatment and accounts for as much as 60% of energy consumption in the activated sludge process. Prior to 1984, no standard method for quantifying oxygen transfer existed, which created problems in the design and warranties for treatment plants. The ASCE standards for the measurement of oxygen transfer in clean water and the Standard Guidelines for In-Process Oxygen Transfer Testing have found widespread application and have reduced design variability. The standard has allowed operators and engineers to better evaluate process operation of existing treatment plants. This paper illustrates the key concepts of the standard and shows why they are important and how they reduce the variability of oxygen transfer testing. The reasons for the standard's success are described, as are the pitfalls of earlier approaches. The paper also highlights key new areas of the revised clean water standard, including an optional correction for test water total dissolved solids concentration and applications to the loop (ditch) activated sludge process and the high-purity-oxygen activated sludge process. Finally an analysis is presented that shows how numerical treatment of the transfer data minimizes the impact of gas-side oxygen depletion. [ABSTRACT FROM AUTHOR]
ISSN:	07339372
DOI:	10.1061/(ASCE)EE.1943-7870.0000456