01.27.10 -- EPA Strengthens Air Quality Standard For Nitrogen

January 27, 2010


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Featured Article

An Empiracle Method For Validating The Log-Inactivation Of A UV Reactor
By Keith G. Bircher, Calgon Carbon Corporation
UV reactors are traditionally validated by determining the Reduction Equivalent Dose (RED) that a reactor will achieve as a function of flow, UV transmittance (UVT), and lamp UV output under various operating conditions. RED is determined by relating the log-inactivation of a test microbe to a dose value using the UV dose-response curve of that microbe measured in the lab using a collimated beam apparatus. Because UV reactors deliver a dose distribution, the RED is dependent on the UV sensitivity of the organism being treated.

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