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.


Qualitative evaluations about the disinfection capabilities of a water distribution network : a model study
Nadiroğlu, Coşkun; Köken, Mete; Aydın, İsmail; Department of Civil Engineering (2014)
“Chlorine” is one of the major disinfectants extensively used in distribution systems that neutralizes the disease-causing organisms. This model study evaluates the disinfection capabilities of a specific water distribution network N8.3 of Ankara water distribution system under various operating conditions. N8.3 supplies water, roughly to 40,000 people. The network is served by a pump station and pumping schedule is critical concerning the occurrence of minimum chlorine concentrations. Continuous “blind” pu...
Fate and removal of pesticides in wastewater treatment plants –case of Yeşilirmak basin
Kocaman, Kumru; Dilek, Filiz Bengü; Yetiş, Ülkü; Department of Environmental Engineering (2019)
The effluent of wastewater treatment plants (WWTP) had been shown to be a significant source of micropollutants in surface waters. In this study, the aim was to investigate the biological treatment of commonly found micropollutants in Yeşilırmak river basin, with special emphasis on the effects of operational conditions on their removal in conventional biological WWTPs. Based on the monitoring results of TÜBİTAK project (115Y013) “Management of Point and Diffuse Pollutant Sources in Yeşilırmak River Basin” ...
Determination of thmfp of the reservoirs in Turkey : kinetics aspect
Artuğ, Mine; Dilek, Filiz Bengü; Department of Environmental Engineering (2004)
Chlorine is still the most commonly used disinfectant in many water treatment plants all over the World. However, studies conducted demonstrated that the chlorine reacts with the natural organic matter (NOM) in source waters, and leads to the formation of a variety of chlorinated organic compounds, disinfection by-products (DBPs). Among these, the most common are the trihalomethanes (THMs). In this study, kinetics of the THM formation was investigated. Kinetic experiments were carried out with the raw water...
Use of calcium alginate as a coagulant in water treatment
Çoruh, Hale Aylin; Sanin, Faika Dilek; Department of Environmental Engineering (2005)
Coagulation and flocculation processes are important parts of water and wastewater treatment. Coagulation or destabilization of colloidal suspensions results in aggregation of colloidal particles by physical and chemical processes. Flocculation results in the formation of larger and settleable structures by bridging. Alginate, a polysaccharide obtained from marine brown algae, produces a gel structure when mixed with calcium ions, which is expected to be a potential coagulant in water treatment. This study ...
The effect of reed beds on wave attenuation and suspended sediment concentration
Oğuz, Elif; Koroglu, Aysun; Kabdaşlı, Mehmet Sedat (Coastal Education and Research Foundation, 2013-01-01)
The effect of emergent and submerged vegetation on uniform and oscillatory flow conditions has been intensively studied by researchers in the last two decades. It has been determined that vegetation affects wave characteristics and cause wave attenuation especially in shallow waters where wave orbitals are in interaction with vegetation. Consequently they affect sediment deposition and resuspension acting as a sink. The aim of this study is to determine wave attenuation due to vegetation, and to identify th...
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.