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Additional resources for Disinfection By-Products in Drinking Water: Current Issues
Dose of chlorine dioxide: 0,4 mg/L; pH-value: 8,O. 20T 395 \ 3 25 2 1-5 SAC(254) in llm 1 03 0 quotient 1. That means, the reaction (2a) seems to take place and should be a main source of chlorate formation. The modeling of the process of chlorate formation which depends on the pH-value should be possible and the objective of further research. 8The main parameters which are to consider are the dose of the disinfection agent, the bromide level, the contact time and the pH-value. ^^^^'^"^ In general, it can be assumed that an increasing level of NOM causes a higher ozone consumption as shown in Figure 7.
Therefore, the selective input of waste waters might be the main reason of this pollution. In order to examine the process of the chlorate formation by disinfection the different treated water samples were spiked with hypochlorite solution, absolutely free of chlorate, and fresh chlorine dioxide solution. In addition to that, some water samples were spiked with ozone prior the chlorination. In Table 2 the concentration of the chlorate determined in the water samples is correlated with the dose of chlorine, ozone and the contact time.
2,2,2-Trichloroacetamide 6. 1,2,3,4,S,5-Hexachloro-l,3cyclopentadiene 7. 2-Bromobenzothiazole 8. 2-Chlorobenzothiazole 9. Chloromethylbenzene Non-halogenated DBPs 1. Benzeneacetonitrile 2. Heptanenitrile 3. 5-Methyl-3-isoxazolamine X X X X X X X X X X Plus all of the same aldehydes, ketones, carboxylic acids as with ozone alone ' Tentative ID Confirmed Identification (with standard) 52 rable 3 Chlorine Dioxide Disinfection Carboxvlic acids Butanoic acid 1. Pentanoic acid 2. Hexanoic acid 3. 4. Heptanoic acid 5.