Removal of triclosan from surface waters by ozonation: kinetics & removal mechanism/

Orhon, Kemal Berk
Triclosan (TCS) has recently attracted the attentions of the researchers from the fields of water treatment due to its existence in water environments as a result of widely usage in the world. This study was conducted to investigate the removal of TCS from Milli-Q and surface water by means of ozonation and to observe ozonation by-product formation. Effects of ozone dose, initial TCS concentration, water matrix and pH were also investigated to comprehend TCS removal by ozonation in different conditions and optimize the treatment system accordingly. Furthermore, kinetics of TCS removal in the aforesaid different conditions were studied to have a clear understanding of the applied technique. Experiments were conducted on lab-scale using ozone generator to supply ozone to the glass reactors containing 1 L samples spiked with TCS. Reactors were exposed to ozone through 30 min. HPLC-UV device was used for TCS measurement of water samples after ozone treatment. Samples were analyzed for TCS at 1, 5, 10, 20 and 30 min. Results have indicated that ozonation is an effective way of TCS removal from water samples with removal efficiency of 99%; however, by-product formation was evident. Three of the five by-products were identified as 2,4-dichlorophenol, 4-chlorocathecol and 2-4 dicholoroanisole which were also observed to be eliminated to a great extent upon further ozonation. Ozone dose, TCS content of the water, water matrix and pH were also found to have significant influences on treatment efficiency and therefore, they should be considered during the design and operation of the ozonation unit.
Citation Formats
K. B. Orhon, “Removal of triclosan from surface waters by ozonation: kinetics & removal mechanism/,” M.S. - Master of Science, Middle East Technical University, 2014.