Characterization of raw water for the ozone application measuring ozone consumption rate

This study was conducted to illustrate an ideal method For characterizing n atural waters for ozonation processes in drinking water treatment plants. A specific instrument designed with the flow injection analysis (FIA) techni que enabled us to measure accurately the ozone decomposition rate, which wa s found to consist of two stages: the instantaneous ozone consumption stage and the slower ozone decay stage. The ozone consumption rate was measured at the initial and secondary stages by determining certain parameters calle d the instantaneous ozone demand (ID) and the pseudo first-order decay rate constant (k(c)). Using the OH . -probe the yield of OH . per consumed ozon e was also measured to determine its potential ti, produce OH . for the oxi dation of micropollutants during the ozonation process. The ozone consumpti on of the ID values was significant in most natural waters, and substantial amounts of OH . were found to generate during the instantaneous ozone cons umption stage. This study also investigated the effects of particulates, oz one doses, and sequential ozone injection on ozone decomposition kinetics a nd OH . formation yield. (C) 2001 Elsevier Science Ltd. All rights reserved .