Reclamation of Real Urban Wastewater Using Solar Advanced Oxidation Processes: An Assessment of Microbial Pathogens and 74 Organic Microcontaminants Uptake in Lettuce and Radish

Environmental Science & Technology
Yelitza AguasMaría Inmaculada Polo-López

Abstract

In this study, disinfection of urban wastewater (UWW) with two solar processes (H2O2 -20 mg/L and photo-Fenton 10 mg/L-Fe2+/20 mg/L-H2O2 at natural water pH) at pilot scale using a 60 L compound parabolic collector reactor for irrigation of two raw-eaten vegetables (lettuce and radish) has been investigated. Several microbial targets (total coliforms, Escherichia coli, Salmonella spp., and Enterococcus spp.) naturally occurring in UWW and 74 organic microcontaminants (OMCs) were monitored. Disinfection results showed no significant differences between both processes, showing the following inactivation resistance order: Salmonella spp. < E. coli < total coliforms < Enterococcus spp. Reductions of target microorganisms to concentrations below the limit of detection (LOD) was achieved in all cases with cumulative solar UV energy per volume (QUV) ranged from 12 to 40 kJ/L (90 min to 5 h). Solar photo-Fenton showed a reduction of 66% of OMCs and solar/H2O2 of 56% in 5 h treatment. Irrigation of radish and lettuce with solar treated effluents, secondary effluents, and mineral water was performed for 6 and 16 weeks, respectively. The presence of bacteria was monitored in surfaces and uptake of leaves, fruit, and also in soil. The bact...Continue Reading

References

Jun 25, 2010·The ISME Journal·Jan Dirk van ElsasJack T Trevors
Dec 4, 2012·Microbiology and Molecular Biology Reviews : MMBR·Muruleedhara N ByappanahalliValerie J Harwood
Dec 1, 2015·Environmental Science & Technology·Elizabeth L MillerJoel A Pedersen
Mar 24, 2018·Environmental Sciences Europe·Valeria DulioJan Koschorreck
Jan 10, 2019·Environmental Research·Anastasis ChristouDespo Fatta-Kassinos

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Citations

Aug 8, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Chunying LiChein-Chi Chang
May 16, 2021·The Science of the Total Environment·Gulnara ManiakovaMaría Inmaculada Polo-López
Sep 11, 2021·International Journal of Environmental Research and Public Health·Menta BallesterosPilar Fernández-Ibañez

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