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Biological efficacy and toxic effect of emergency water disinfection process based on advanced oxidation technology

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Abstract

An innovative and removable water treatment system consisted of strong electric field discharge and hydrodynamic cavitation based on advanced oxidation technologies was developed for reactive free radicals producing and waterborne pathogens eliminating in the present study. The biological efficacy and toxic effects of this advanced oxidation system were evaluated during water disinfection treatments. Bench tests were carried out with synthetic microbial-contaminated water, as well as source water in rainy season from a reservoir of Dalian city (Liaoning Province, China). Results showed that high inactivation efficiency of Escherichia coli (>5 log) could be obtained for synthetic contaminated water at a low concentration (0.5–0.7 mg L−1) of total oxidants in 3–10 s. The numbers of wild total bacteria (108 × 103 CFU mL−1) and total coliforms (260 × 102 MPN 100 mL−1) in source water greatly reduced to 50 and 0 CFU mL−1 respectively after treated by the advanced oxidation system, which meet the microbiological standards of drinking water, and especially that the inactivation efficiency of total coliforms could reach 100 %. Meanwhile, source water qualities were greatly improved during the disinfection processes. The values of UV254 in particular were significantly reduced (60–80 %) by reactive free radicals. Moreover, the concentrations of possible disinfection by-products (formaldehyde and bromide) in treated water were lower than detection limits, indicating that there was no harmful effect on water after the treatments. These investigations are helpful for the ecotoxicological studies of advanced oxidation system in the treatments of chemical polluted water or waste water. The findings of this work suggest that the developed water treatment system is ideal in the acute phases of emergencies, which also could offer additional advantages over a wide range of applications in water pollution control.

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Acknowledgments

The present work was supported by the National High Technology Research and Development Program of China (2012AA062609), the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2013BAC06B02), the National Natural Science Foundation Project of China (51309039), and the Fundamental Research Funds Program for the Central Universities (3132014233).

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Correspondence to Zhitao Zhang.

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Tian, Y., Yuan, X., Xu, S. et al. Biological efficacy and toxic effect of emergency water disinfection process based on advanced oxidation technology. Ecotoxicology 24, 2141–2150 (2015). https://doi.org/10.1007/s10646-015-1559-9

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