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Abstract
The off-gas method can be used to investigate standard oxygen transfer efficiencies under process conditions (αSOTE) over the operating life of an aeration system. A method to evaluate αSOTE is described in detail by US and German standards. The standards, however, do not describe how to evaluate dynamic changes in αSOTE 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.