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Simulating the Environmental Risks Resulted from Using Different Biocides in the Cooling System of Coastal Nuclear Power Plant |
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PP: 5-11 |
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Author(s) |
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M. S. Tawfik,
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Abstract |
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| The using of biocides to the incoming seawater of the nuclear power plant, as important algaecide tool in order to prevent bio-fouling in cooling water system. In this study Egyptian coastal (Sidi Kirir) area was selected as a cooling water source, and once through pass cooling water system plant was also suggested as nuclear power cooling water type, where its measured pH and alkalinity data were suitable for using modeling software (Quantitative Structure Activity Relationships (QSARs), which it will be used to predict the aquatic toxicity resulting from using different types of non- oxidizing biocides (chlorophenol, trichlorophenol and quaternaryphenyl) and oxidizing biocides (sodium hyphochlorite, chlorine dioxide and ozone) in the suggested once through cooling water system. field study survey was done, water samples was taken, and Physicochemical and biological parameters were measured as Statistical correlations for different Kow were being done in-order to select the lower environmental risk biocide which would be used in cooling water treatment system of the suggested nuclear power plant. Study results showed that the lowest LC50 in Fish and Daphnia that found in case of using Quaternary phenyl biocide, while the highest LC50 value was showed in Chlorophenol values of fish and Daphnia. On the Other hand the lowest EC50 value of green algae was found when using quaternary phenyl biocide. This support the using of quaternary phenyl as low ecological risk biocide fouling treatment method in the cooling water system at the selected site Sidi Kirir region when using non-oxidixing biocides. In case of using oxidizing biocides, the results showed that lowest LC50 in Fish and Daphnia were found when using ozone biocide while the highest LC50 values obtained in fish and Daphnia when using chlorine dioxide, while in case of EC50 results showed that the lowest EC50 value in green algae was found when using ozone biocide while the highest EC50 value of green algae found when using chlorine dioxide biocide this support the using ozone as low ecological risk ecological biocide in the treatment of the cooling water system at the selected site .
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