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 waters from Devegeç / idi and Atatü / rk Reservoirs as well as with water containing a model compound, humic acid. THM and Chlorine concentrations were measured for 6 weeks on a seasonal basis. The simulation model developed by USEPA was used for predicting THM concentrations.
The results of this study have shown that THM formation increases with increasing time and higher chlorine doses result in higher THM formation. Also, higher organic matter concentrations resulted in higher chlorine demands and both these parameters increased the TTHM concentrations. But, on the contrary to the standard THMFP testing, THM formation did not complete in seven days. In addition, THM formation and chlorine consumption were very rapid during the first 24 hr followed by a more gradual formation and decay after 24 hr. THM formation rates ranged between 35-66 µ / g/L.day for Atatü / rk Reservoir, between 80-167 µ / g/L.day for Devegeç / idi Reservoir and between 85-248 µ / g/L.day for humic acid during the first 24 hr, and ranged between 2-6 µ / g/L.day for Atatü / rk Reservoir, between 7-16 µ / g/L.day for Devegeç / idi Reservoir and between 3-14 µ / g/L.day for humic acid after 24 hr.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12605587/index.pdf |
| Date | 01 November 2004 |
| Creators | Artug, Mine |
| Contributors | Dilek, Filiz Bengu |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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