The report gives results of a state-of-the-art review of processes being developed to remove NOx from power plant stack gas. The report's 48 processes include: wet and dry NOx processes, and wet and dry simultaneous NOx/SOx processes. Each process technical evaluation includes a detailed description, a simplified block flow diagram, its current development status, its raw material and utility requirements, published economics, technical and environmental considerations, and its overall advantages and disadvantages. Eight processes are recommended as candidates for preliminary economic analysis in the next phase of the study.

Prepared for Electric Power Research Institute, Fossil Fuel Power Plants Department and Environmental Protection Agency, Office of Research and Development by the Tennessee Valley Authority, Office of Agricultural and Chemical Development under EPA Interagency agreement no. D7-E721-FU, EPA program element no. INE624A, EPRI project no. RP 783-1. Issued November 1977. "EPA Interagency Agreement No. D7-E721-FU, EPA Program Element No. INE624A, EPRI Project No. RP 783-1."-- t.p. "EPA Project Officer: J. David Mobley."--t.p. "EPRI Project Monitor: Donald P. Teixeira."--t.p. "Prepared for Fossil Fuel Power Plants Department, Electric Power Research Institute, Palo Alto, California 94303 and Office of Research and Development, U.S. Environmental Protection Agency, Washington, D.C. 20460."--t.p. Includes bibliographical references (p. 379-386).

A state-of-the-art review of the processes currently being developed for the removal of nitrogen oxides (NOx) from power plant stack gas was conducted. Included within the 48 processes discussed in the report are: dry NOx processes, dry simultaneous NOx-SOx processes, wet NOx processes, and wet simultaneous NOx-SOx processes. The major sections in each technical evaluation for each process included detailed process description containing a simplified block flow diagram, the current status of development of the process, the raw material and utility requirements, the published economics, the technical and environmental considerations, and the overall advantages and disadvantages of the process. In addition to this review of the current NOx flue gas treatment (FGT) technology, eight of these processes were recommended as candidates for preliminary economic analysis in the next phase of the study. The information for this report was gathered during the first half of 1977 and work was completed as of July 1977. The report was prepared by the Tennessee Valley Authority under a project cofunded by the U.S. Environmental Protection Agency and the Electric Power Research Institute.