Secure Quality Drinking Water by Safe Mixing and Handling of Chlorine and Chlorine Dioxide Disinfectants in Qatar Elsamoul H. Mohamed1; Khalid Y. Abid2; Hassan I. Nimir3; and Mustafa M Osman4 1Water Quality laboratory, Qatar General Electricity and Water corporation, Qatar; Email: [email protected] 2Department of Health, and Safety, Qatar General Electricity and Water corporation, Qatar. 3Department of Chemistry & Earth Sciences, College of Arts & Science, Qatar University, P.O.Box, 2713, Doha , Qatar. [email protected] 4 Sudan Atomic Energy commission, Sudan Abstract It is important to provide protection from pathogens while simultaneously minimizing health risks to the population from disinfection byproducts.1In this study mixing of different ratios of chlorine and chlorine dioxide disinfectants were investigated with respect to the byproduct formed, quality of drinking water and the environmental impact. Two samples of treated water were collected from their delivery point at Ras Laffan-Q Power, and Ras Abu Fontas-A, in Doha-Qatar. The two water samples were mixed together in different ratios. A total of 10 samples from the blending ratio were analyzed for pH, Chlorine residual, Chlorine dioxide residual, Chlorite, Chlorate, bromate and Trihalomethanes, (THM's) byproducts, using colorimeter, Ion chromatography and GC-MS instrument.2 According to the obtained statistical data, the correlation coefficient has been shown that there is a significant correlation between chlorite and chlorate formation when water of chlorine is added to the water of chlorine dioxide.3That will be a good tool to control the level of chlorite and chlorate when required. The changing of pH value depends on the chlorine level, although there is no bromate increasing within 24 hrs. While the THM's results remain intact. We found that on site chlorine dioxide generation will play a significant security factor, compared to chlorine gas which required a lot of safety measures during transportation, usage, handling and storing. References 1.WHO, Guidelines for drinking-water quality, fourth edition. 2011(1)179,180, 325 and 326. 2.Elsamoul H. Mohamed, Khalid Y. Abid, Hassan I. Nimir, and Raheem T. Mahdi and Mustafa M Osman; Evaluation of Mixing Chlorine and Chlorine Dioxide Disinfectants and Their By Products in Drinking Water in Qatar- ABHA conference, April 2014 3.Douglas Rittmann, Kevin Linder and Brad Zachman, Impact of Combining Chlorine Dioxide and Chlorine in Minimizing Chlorite and THM. 2009.


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