Cryptosporidium and Giardia safety margin increase in leafy green vegetables irrigated with treated wastewater
| Autor: | Inmaculada Amorós, Eva Doménech, José Luis Izquierdo Alonso, Yolanda Moreno |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Veterinary medicine Irrigation Agricultural Irrigation Food Safety TECNOLOGIA DE ALIMENTOS 030106 microbiology Cryptosporidium 010501 environmental sciences Wastewater 01 natural sciences 03 medical and health sciences Food Parasitology Vegetables Botany parasitic diseases Effluent Leafy 0105 earth and related environmental sciences Risk assessment biology Giardia Oocysts Public Health Environmental and Occupational Health MICROBIOLOGIA Reclaimed water biology.organism_classification digestive system diseases Sewage treatment Seasons |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| Popis: | [EN] The presence of Cryptosporidium and Giardia in waste water is a main concern because water reuse for irrigation can jeopardize human health. Spanish Legislation for water reuse does not oblige to analyze the presence of both pathogens Cryptosporidium and Giardia in reused water for irrigation. Therefore, the objective of this paper is to determine the influence of wastewater treatment in the increase of the consumer safety margin in relation to the presence of Cryptosporidium and Giardia in leafy green vegetables. With this aim in mind, a total of 108 samples from raw (influent) and treated wastewater (effluent) from three wastewater treatment plants in Spain were analysed according to USEPA Method 1623. Effluent results show that Cryptosporidium oocysts average counts ranged from 1.38 to 2.6/L oocysts and Giardia cysts ranged from 0.6 to 1.7/L cysts, which means a removal values of 2.7 log, 2.5 log and 1.8 log for Cryptosporidium oocysts and 1 log, 2 log and 2.2 log for Giardia cysts in the three wastewater treatment plants analysed. In relation to safety margin the highest probability that exposure exceed the dose response was observed for Giardia. In addition, the sensitivity analysis showed that (oo) cysts concentration present in the leafy green vegetables and the human dose-response were the most influential inputs in the safety margin obtained. We thank EPSAR for authorizing us sampling of WWTP and the personnel of WWTP for providing with WWTP samples. We also thank members of GAMASER for concentrating the secondary and tertiary WWTP samples with the Envirocheck capsules. This study has been supported by the Spanish Ministry of Economy and Competitiveness (MINECO), in the frame of the collaborative international consortium WATERJPI2013-095-C03-02-METAWATER of the Water Challenges for a Changing World Joint Programming Initiative (Water JPI) Pilot Call. |
| Databáze: | OpenAIRE |
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