RESTON, Va. – The American Society of Civil Engineers (ASCE) will conduct a public comment period on the update to ASCE/EWRI 2-XX Measurement of Oxygen Transfer in Clean Water. The public comment period will be held from November 16, 2020 to December 31, 2020.

This procedure covers the measurement of oxygen transfer rate (OTR) as a mass of oxygen per unit time dissolved in a volume of water by an oxygen transfer system operating under given gas rate and power conditions. The procedure is applicable to laboratory-scale oxygenation devices with small volumes of water as well as to full-scale systems with water volumes typical of those found in the activated sludge wastewater treatment process. The procedure is valid for a wide variety of mixing conditions.

Other items of interest that can be calculated are the standard aeration efficiency, or rate of oxygen transfer per unit power input, and the standard oxygen transfer efficiency, reporting items is another item of interest.

Accessing the Public Comment System will require using or creating an ASCE web user account. For additional questions contact James Neckel, ASCE’s Codes and Standards Coordinator, at or (703) 295-6176.