Triclosan removal from surface water by ozonation - Kinetics and by-products formation

Date

2017-12-15

Author

ORHON, kemal berk
ORHON, aybala koc
Dilek, Filiz Bengü
Yetiş, Ülkü

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

248
views

0
downloads

Removal of triclosan from surface water by ozonation was investigated. The results showed that complete elimination of triclosan from a surface water bearing 1-5 mg/L triclosan via continuous ozonation at 5 mg/L, require an ozonation time of 20-30 min depending on pH. Triclosan oxidation followed pseudo-first order kinetics with an apparent reaction rate constant varying from 0.214 min(-1) to 0.964 min(-1) depending on pH, initial triclosan concentration and water composition. Although the effect of pH was complex due to possible existence of different moieties, higher TCS removal efficiencies were obvious at weak-base conditions. Experiments performed to identify degradation by-products showed the formation of four by-products, namely, 2,4-dichlorophenol, 4-chlorocatechol and two unidentified compounds. Additionally, 2,4-dichloroanisole was detected when a methyl moieties exist in water. By-products were found to be eliminated upon further ozonation. The required exposure time varied from 20 to 30 min depending on pH of water. The ozone demand exerted for the complete oxidation of triclosan and its by-products was calculated as 13.04 mg ozone per mg of triclosan. A triclosan degradation pathway, which was found to be highly pH dependent, was proposed.

Subject Keywords

Ozonation, Triclosan, By-product, Surface water, Kinetics

URI

https://hdl.handle.net/11511/32798

Journal

JOURNAL OF ENVIRONMENTAL MANAGEMENT

DOI

https://doi.org/10.1016/j.jenvman.2017.09.025

Collections

Department of Environmental Engineering, Article

Suggestions

OpenMETU
Core

Triclosan removal by NF from a real drinking water source - Effect of natural organic matter OGUTVERİCİ, Abdullah; Yılmaz, Levent; Yetiş, Ülkü; Dilek, Filiz Bengü (2016-01-01) Nanofiltration (NF) is known as a very effective technology in the removal of micropollutants from surface water for drinking water purposes. In this study, NF of triclosan (TCS) which is a commonly used biocide in many different domestic and industrial applications was investigated in relation to its interaction with natural organic matter (NOM). A laboratory scale cross-flow device was operated in total recycle mode using a thin-film composite membrane with a real surface water. The effect of NOM content ...
Homogeneous and heterogeneous catalytic ozonation of pulp bleaching effluent Balcioglu, Isil Akmehmet; Moral, Cigdem Kivilcimndan (2008-08-31) Catalytic ozonation is a promising treatment method for both water and wastewater. In this study, in order to increase the biodegradability of bleaching wastewater from an integrated pulp- and -paper production plant, granulated activated carbon-(GAC), iron-(Fe2+) and manganese-(Mn2+) ion-catalyzed ozonation processes were used as a pre-treatment process. The effects of the catalyst concentration and the initial pH (pH(i)) of wastewater on the treatment efficiency of processes were investigated. Although me...
Cadmium removal using clinoptilolite : influence of conditioning and regeneration Gedik, Kadir; İmamoğlu, İpek; Department of Environmental Engineering (2006) Clinoptilolite samples obtained from two deposits in Turkey were tested for their potential in removing cadmium from aqueous solutions. Preliminary experiments in batch mode revealed inferior cadmium uptake at low pH. Particle size was found to have no effect on cadmium removal efficiency suggesting the use of exchangeable cations found in the internal/available sites. Increasing temperature yielded positive, whereas prewashing had no effect on cadmium removal using both clinoptilolite samples. The Langmuir...
OZONATION OF TRACE ORGANIC-COMPOUNDS - MODEL PREDICTIONS VERSUS EXPERIMENTAL-DATA YURTERI, C; GUROL, MD (1990-06-01) This paper is focused on the use of ozone for the elimination of manmade organic micropollutants from drinking waters and waste effluents requiring advanced treatment. A mathematical model was developed to simulate the physical transport and chemical oxidation phenomena prevailing during the process of ozonation. A packed column reactor was constructed in order to test the aptness of the process model. After determining the fluid-dynamic and mass transfer properties of the reactor, stock water solutions spi...
Performance evaluation of Cappadocian tuffs treated with alcohol dispersion of calcium hydroxide nano-particles Çalışkan, Berkay Barış; Tavukçuoğlu, Ayşe; Saltık, Emine Nevin; Department of Building Science in Architecture (2022-12-08) In this study, the effect of treatment with alcohol dispersion of calcium hydroxide Ca(OH)2 nanoparticles on controlling excessive water absorption and capillary water suction properties of Cappadocian tuffs was investigated extensively. For this purpose, two tuff types, Göreme Rock (CYT) and Cappadocian Rose (CPT), obtained from a quarry near Avanos-Nevşehir, were examined. Laboratory tests were conducted concerning their basic physical, hygric, mechanical, microstructural, and mineralogical properties bef...

Citation Formats

k. b. ORHON, a. k. ORHON, F. B. Dilek, and Ü. Yetiş, “Triclosan removal from surface water by ozonation - Kinetics and by-products formation,” JOURNAL OF ENVIRONMENTAL MANAGEMENT, pp. 327–336, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/32798.