Cross-Contamination of Residual Emerging Contaminants and Antibiotic Resistant Bacteria in Lettuce Crops and Soil Irrigated with Wastewater Treated by Sunlight/H sub( 2)O sub( 2)

The sunlight/H...O... process has recently been considered as a sustainable alternative option compared to other solar driven advanced oxidation processes (AOPs) in advanced treatment of municipal wastewater (WW) to be reused for crop irrigation. Accordingly, in this study sunlight/H...O... was used...

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Bibliographic Details
Published in:Environmental science & technology 2015-09, Vol.49 (18), p.11096-11096
Main Authors: Ferro, Giovanna, Polo-Lopez, Maria I, Martinez-Piernas, Ana B, Fernandez-Ibanez, Pilar, Agueera, Ana, Rizzo, Luigi
Format: Article
Language:English
Subjects:
Escherichia coli
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Summary:The sunlight/H...O... process has recently been considered as a sustainable alternative option compared to other solar driven advanced oxidation processes (AOPs) in advanced treatment of municipal wastewater (WW) to be reused for crop irrigation. Accordingly, in this study sunlight/H...O... was used as disinfection/oxidation treatment for urban WW treatment plant effluent in a compound parabolic collector photoreactor to assess subsequent cross-contamination of lettuce and soil by contaminants of emerging concern (CECs) (determined by QuEChERS extraction and LC-QqLIT-MS/MS analysis) and antibiotic resistant (AR) bacteria after irrigation with treated WW. Three CECs (carbamazepine (CBZ), flumequine (FLU), and thiabendazole (TBZ) at 100 ...g L...) and two AR bacterial strains (E. coli and E. faecalis, at 10... CFU mL...) were spiked in real WW. A detection limit (DL) of 2 CFU mL... was reached after 120 min of solar exposure for AR E. coli, while AR E. faecalis was more resistant to the disinfection process (240 min to reach DL). CBZ and TBZ were poorly removed after 90 min (12% and 50%, respectively) compared to FLU (94%). Lettuce was irrigated with treated WW for 5 weeks. CBZ and TBZ were accumulated in soil up to 472 ng g... and 256 ng g... and up-taken by lettuce up to 109 and 18 ng g..., respectively, when 90 min treated WW was used for irrigation; whereas no bacteria contamination was observed when the bacterial density in treated WW was below the DL. A proper treatment time (>90 min) should be guaranteed in order to avoid the transfer of pathogens from disinfected WW to irrigated crops and soil. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0013-936X