| Autor: |
Garkusheva, Natalya, Matafonova, Galina, Tsenter, Irina, Beck, Sara, Batoev, Valeriy, Linden, Karl |
| Předmět: |
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| Zdroj: |
Journal of Environmental Science & Health. Part A. Toxic/Hazardous Substances & Environmental Engineering; 2017, Vol. 52 Issue 9, p849-855, 7p |
| Abstrakt: |
This work evaluated the feasibility of a photo-Fenton-like process using persulfate (PS) and ferrous iron (Fe2+) under simulated solar radiation for degrading the herbicide atrazine (ATZ, 6-Chloro-N-ethyl-N′-isopropyl-1,3,5-triazine-2,4-diamine) and inactivatingE. coli. Milli Q water, lake water, and diluted wastewater effluents were spiked both simultaneously and separately with ATZ (4 mg/L) andE. coli(105CFU/mL), and exposed to treatment. A method for determining the average irradiance throughout the water media in the UV(A+B) range of the Xe lamp emission was developed for bench-scale experiments. These values were used to calculate the UV(A+B) fluences and the solar UV(A+B) energy doses per unit of volume (QUV(A+B), kJ/L). The obtained kinetic data were presented versus energy dose. Treatment of lake water at near-neutral pH was ineffective via the photo-Fenton-like process, attaining only 20% ATZ removal and 1-log reduction ofE. coli. In Milli Q water and wastewater, the complete degradation of ATZ in the absence of bacteria was observed at an average energy dose of 1.5 kJ/L (60 min), while in the presence of cells the degradation efficiency was ∼60%. When ATZ was present,E. coliinactivation was also affected in Milli Q water, with 1.4-log reduction (93%) at a dose of 1.6 kJ/L (60 min), whereas in wastewater complete inactivation was achieved at a lower dose of 1.3 kJ/L (45 min). The energy requirements on aQUV(A+B)basis for simultaneous 90% ATZ removal and 99.99%E. coliinactivation in Milli Q water and wastewater were shown to be less than 10 kJ/L. This suggests the solar/PS/Fe2+system is promising for simultaneous treatment and disinfection of wastewater effluents. [ABSTRACT FROM PUBLISHER] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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