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Título del libro: Modern Multidisciplinary Applied Microbiology: Exploiting Microbes And Their Interactions
Título del capítulo: Removal of Microorganisms Present in Lettuces and Soil Irrigated with Treated Wastewaters

Autores UNAM:
MARIA NEFTALI ROJAS VALENCIA; VICTOR FRANCO;
Autores externos:

Idioma:
Inglés
Año de publicación:
2008
Palabras clave:

Lettuce; Ozone; Pathogenic microorganisms


Resumen:

The high contamination levels in Mexican wastewater due to the presence of pathogenic microorganisms pose serious health risks to those consuming fruits and vegetables irrigated with wastewater. For this reason, the aim of this work was, to determine the capacity of O3 to destroy bacterias, protozoa and helminth eggs present in wastewater. The O3 was applied at a concentration of 36.8 mg O3/min at pH 7, for different lengths of time. Results showed that, destruction times required for 100% removal of the initial bacteria population was at 15 minutes, while helminths eggs and protozoa required 1 hour. Finally, lettuces and soil were irrigated with wastewaters treated with O3. The analysis of microorganisms gave a reduction of the 100% of bacteria faecal coliforms, S. typhi and V. cholerae, and significant reductions of protozoa and helminth eggs and showed an increment in leaves and root of lettuces of 6% and 16% respectively, with regard to the lettuces that were watered with wastewaters without treatment. © 2006 Wiley-VCH Verlag GmbH & Co. KGaA.


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