| Summary: | Wind friction is a fundamental parameter in modelling air emissions from passive liquid surfaces at WWTPs. This work assessed preliminary discrepancies associated to the use of an empirical equation to estimatefriction velocities for emission modelling, comparing the mass transfer coefficient calculated by different emission models if two distinct approaches are used to address the wind speed range between 1 ms-1 and 6 ms-1. Other situations related to the operation of the WWTP, which can affect the volatilisation process are also discussed. In the wind speed range studied, the inclusion of a different expression for the friction velocity can lead to differences of about 20% in the global mass transfer coefficients (assessed here for H2S) and therefore in the emission rate, depending on the model applied.
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