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Title: Microbiological contamination of conventional and reclaimed irrigation water: evaluation and management measures
Author: Rusiñol Arantegui, Marta
Hundesa Gonfa, Ayalkibet
Cárdenas Youngs, Yexenia I.
Fernandez-Bravo, Ana
Perez-Cataluña, Alba
Moreno-Mesonero, Laura
Moreno, Yolanda
Calvo, Miquel (Calvo Llorca)
Luis Alonso, Jose
Jose Figueras, Maria
Araujo Boira, Rosa Ma.
Bofill Mas, Silvia
Gironès Llop, Rosina
Keywords: Contaminació de l'aigua
Conreus de regadiu
Water pollution
Irrigation farming
Issue Date: 30-Dec-2019
Publisher: Elsevier B.V.
Abstract: The wide diversity of irrigation water sources (i.e., drinking water, groundwater, reservoir water, river water) includes reclaimed water as a requested measure for increasing water availability, but it is also a challenge as pathogen exposure may increase. This study evaluates the level of microbial contamination in different irrigation waters to improve the knowledge and analyses management measures for safety irrigation. Over a one-year period, the occurrence of a set of viruses, bacteria and protozoa, was quantified and the performance of a wetland system, producing reclaimed water intended for irrigation, was characterized. Human fecal pollution (HAdV) was found in most of the irrigation water types analysed. Hepatitis E virus (HEV), an emerging zoonotic pathogen, was present in groundwater where porcine contamination was identified (PAdV). The skin-carcinoma associated Merkel cell polyomavirus (MCPyV), was found occasionally in river water. Noroviruses were detected, as expected, in winter, in river water and reclaimed water. Groundwater, river water and reservoir water also harboured potential bacterial pathogens, like Helicobacter pylori, Legionella spp. and Aeromonas spp. that could be internalized and viable inside amoebas like Acanthamoeba castellanii, which was also detected. Neither Giardia cysts, nor any Cryptosporidium oocysts were detected. The wetland system removed 3 Log10 of viruses and 5 Log10 of bacteria, which resembled the river water quality. Irrigation waters were prone to variable contamination levels and according to the European guidance documents, the E. coli (EC) levels were not always acceptable. Sporadic detection of viral pathogens as NoV GII and HAdV was identified in water samples presenting lower EC than the established limit (100MNP/100 mL). When dealing with reclaimed water as a source of irrigation the analysis of some viral parameters, like HAdV during the peak irrigation period (summer and spring) or NoV during the coldest months, could complement existing water management tools based on bacterial indicators.
Note: Versió postprint del document publicat a:
It is part of: Science of the Total Environment, 2019, vol. 710, p. 136298
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ISSN: 0048-9697
Appears in Collections:Articles publicats en revistes (Genètica, Microbiologia i Estadística)

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