Simultaneous Disinfection and Organic Microcontaminant Removal by UVC-LED-Driven Advanced Oxidation Processes
نویسندگان
چکیده
This work presents the comparison of four advanced oxidation processes driven by UVC-LED radiation (278 nm—2 W/m2) for simultaneous bacteria inactivation (Escherichia coli—106 CFU/mL) and microcontaminant removal (imidacloprid—50 µg/L) in simulated wastewater secondary effluent. To this end, activation H2O2 S2O82− as precursors HO• SO4•−, respectively, UVC-LED/Fe3+–NTA (ferric nitrilotriacetate at 0.1 mM) has been studied different oxidant concentrations. For purpose comparison, conventional chlorination was used baseline along with bacterial regrowth 24 h after treatment. Disinfection achieved within first 30 min all processes, mainly due to bactericidal effect radiation. UVC-LED/H2O2 did not substantially affect imidacloprid low generation UVC irradiation 278 nm, while more than 80% UVC-LED/S2O82−, UVC-LED/Fe3+–NTA/S2O82−, UVC-LED/Fe3+–NTA/H2O2 processes. The most efficient concentration both oxidants disinfection 1.47 mM. Chlorination effective treatment without removal. These findings are relevant scaling up photoreactors tertiary aimed removing microcontaminants.
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ژورنال
عنوان ژورنال: Water
سال: 2021
ISSN: ['2073-4441']
DOI: https://doi.org/10.3390/w13111507