WATER TREATMENT AND DISINFECTION BY UV RADIATION OF THE LED MATRIX (365 nm) IN THE FERROUS-PERSULFATE SYSTEM
Abstract
In this study, the kinetic regularities were studied and the doses of UV radiation were determined for concurrent degradation of herbicide atrazine and inactivation of bacteria Escherichia coli and Enterococcus faecalis in the ferrous-persulfate oxidation system {UV/PS/Fe2+} using a UV-A LED array (365 nm). It was found that the oxidation system {UV/PS/Fe2+} was the most efficient for degrading atrazine and inactivating E. faecalis in a raw: {UV/PS/Fe2+} > {UV/PS} > {PS/Fe2+} > {UV}. The efficiency of E. coli inactivation in the {UV/PS/Fe2+} and {UV/PS} systems was similar, that was attributed to the predominant contribution of high-intensity UV radiation and the higher sensitivity of E. coli to UV radiation than enterococci. The UV dose for degradation of 90% atrazine in the absence of bacteria in the ferrous-persulfate system was 0.48 J/cm2, while these for inactivation of 100% E. coli and E. faecalis without atrazine were 0.94 and 1.43 J/cm2, respectively. The addition of bacteria inhibited the atrazine degradation and decreased the corresponding rate constants (and increase in the UV doses) by one order of magnitude. The inhibition of bacterial inactivation in the presence of herbicide was higher for enterococci. Meanwhile, the required UV doses (7.7 J/cm2) for atrazine degradation were significantly higher than those for total inactivation of E. coli (1.0 J/cm2) and E. faecalis (2.1 J/cm2), and provided the concurrent water disinfection. The obtained results showed the fundamental feasibility and the energy efficiency of one-step water treatment and disinfection in the ferrous-persulfate system, activated by UV-A LED array radiation.
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