title: Evaluation of oxygen transfer efficiency under process conditions using the dynamic off-gas method.
abstract: The off-gas method can be used to investigate standard oxygen transfer efficiencies under process conditions (alphaSOTE) over the operating life of an aeration system. A method to evaluate alphaSOTE is described in detail by US and German standards. The standards, however, do not describe how to evaluate dynamic changes in aSOTE over a day, which can be useful to uncover problems and unfavourable process conditions. Based on over three years experience gained in off-gas testing in Berlin wastewater treatment plants (WWTPs) under operating conditions, a method to evaluate and interpret the dynamic changes in oxygen transfer is presented. The application of the dynamic off-gas method brings important additional information, which can be used to increase operational efficiency of the aeration basin and to increase process reliability, with a relatively small increase in effort. This paper shows how to perform dynamic measurements under process conditions. Some results of such measurements under dynamic process conditions, performed in a Berlin WWTP, are discussed.
authors.affiliation: Institute of Chemical Engineering, Technical University Berlin, Sekr. MA 5-7, Str. 17. Juni 135, 10623 Berlin.
authors.forename: A
authors.initials: A
authors.lastname: Schuchardt
authors.forename: J A
authors.initials: JA
authors.lastname: Libra
authors.forename: C
authors.initials: C
authors.lastname: Sahlmann
authors.forename: U
authors.initials: U
authors.lastname: Wiesmann
authors.forename: R
authors.initials: R
authors.lastname: Gnirss
mesh_terms: D004058:Diffusion; D052918:Environmental Restoration and Remediation; D005160:Facility Design and Construction; D005740:Gases; D005858:Germany; D007220:Industrial Waste; D010100:Oxygen / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry; D013997:Time Factors; D014481:United States; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D005740:Gases; D007220:Industrial Waste; D012722:Sewage; D010100:Oxygen