Application of Ozone/UV Process for the Reclamation of Sewage Treatment Plant Effluent

Abstract

This study was conducted to evaluate the ozone and UV combination (ozone/UV) process for the reuse of sewage treatment plant effluent. The ozone/UV process was compared to the ozone alone and the UV alone processes by measuring a variety of parameters, such as UV absorbance at 410 nm (A410), COD, BOD, BOD/COD, TOC, specific UV absorbance (SUVA), and aldehydes. The organics present in sewage effluent were more effectively removed by hydroxyl radical (OH°) than by molecular ozone. The ozone/UV process was highly effective for the color removal, disinfection, mineralization of organics, and minimization of ozone by-product. It was also found that ozone/UV process equipped with high-intensity UV lamp was more efficient and economical than that with low-intensity UV lamp.