Prior to the project activity, the exhaust from the adipic acid process was directed to a Selective Catalytic Reduction (SCR) unit or a Thermal Reduction Unit (TRU). The SCR destroys NOx as part of the facilty's Clearn Air Act Title V permit requirements; however, the SCR is ineffective at abating N2O. The TRU destroys N2O and NOx to a much lesser extent. As a result, in order to comply with the facility's Title V permit, the SCR was operated historically for a signficant fraction of the year. Phase I of the project activity involves the installation of an absorption column that will convert NOx to nitric acid via a high pressure water absorption process. This absorption column will allow the Thermal Reduction Unit (TRU) to accept a higher percentage of the flow from the adipic acid plant, resulting in a higher quantity of N2O destroyed.