Chlorine dioxide decay and ClO 2

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Background, aim and scope Microbiological safety of drinking water is generally achieved by treating the water with a chemical disinfectant such as chlorine, chlorine dioxide and ozone. Despite the well-known problems of undesired DBPs formation, chlorination is still the most widely used method of disinfection. n. Trihalomethanes (THMs)) have been found to be the most prevalent organic contaminants after drinking water chlorination and typically occur at higher concentrations than other disinfection by-products. THMs and chlorites are the only regulated DBPs in Croatia. . The sum of four THMs is limited to a maximum value of 100 µg g L -1 , while the MCL for chlorite is set at 400 µg g L -1 . 2
There is a pressing need to examine alternative disinfectants to chlorine in order to reduce potential health risks. Chlorine dioxide (ClO 2 ) is widely used as an alternative disinfectant because it does not produce appreciable levels of THMs (some possible hazardous by-products, including chlorite and chlorate are produced). Information such as reaction rate constants and by- products formation can be used as important factors in determining whether disinfection with ClO 2 are suitable for the decreasing unwanted by-products. 3
Page 1: Hrvoje JURETIĆ, Ph.D. University o
Page 5 and 6: For this purpose we examined: T
Page 7 and 8: Analytical Methods A chlorine stock
Page 9 and 10: SIK_15 5 Chlorine_HD Chlorine_LD 4
Page 11 and 12: Results Chlorine decay and THMs for
Page 13 and 14: Results Chlorine decay and THMs for
Page 15 and 16: Results Chlorine dioxide decay and
Page 21 and 22: Chlorine decay parameters Water sam
Page 23 and 24: THMFP Trihalomethane Formation Pote
Page 25 and 26: Conclusions In all of the treated

Chlorine dioxide decay and ClO 2

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