This volume comprises the results of the first international conference examining the promise of the emerging area of photochemistry. It includes the views of engineers and chemists from industry, government and academia, covering such areas as: comparison with other competitive technologies; integration with complementary processes (such as ultrafiltration and biological treatment); transfer of research results into development and application activities; and the economics and optimization of photocatalysis as the energizing themes for the 1990s and beyond. The book should be of interest to environmental scientists and engineers; public works, highways and utilities engineers; photochemists; and to all those involved in the many challenges of water and air purification, remediation, detoxification and deoderization.