Abstract

Outbreaks of foodborne diseases (Norovirus, Salmonella spp., verotoxin producing E. coli, Campylobacter spp., Shigella spp.) related to fruit and vegetable have increased worldwide. Microbial hazards cause considerable and in some cases life-long suffering. Contamination may occur during the entire farm-to-fork continuum with irrigation water as one of the major vehicles for contamination. Therefore, the potential of photocatalytic oxidation water treatment (POWT) to improve inferior irrigation water quality was studied. A prototype of a photocatalytic unit was installed on an irrigation ramp at a commercial field site growing leafy vegetables. Water samples were collected at five distinct sites within the water pipe namely from (i) the irrigation pond, (ii) after coarse filtration, (iii) at the beginning of the field water pipe as well as (iv) before and (v) after treatment using photocatalysis at three occasions with three independent replicates at each event. The water samples were analyzed with respect to indicator organisms for water quality (heterotrophic microorganisms at 22 degrees C, total coliform bacteria, thermotolerant coliform bacteria, E. coli, intestinal enterococci, Salmonella spp.). After the photocatalytic treatment, the number of indicator organisms in the irrigation water decreased with respect to all monitored organisms. This was also observed for Salmonella spp. which was detected at a couple of incidents at the sampling sites prior to the photocatalytic unit. Indicator organisms in the treated water at the irrigation ramp were beyond the thresholds stipulated by guidelines for irrigation water quality in examples such as British Columbia in Canada and Germany.

Keywords

Escherichia coli; human pathogens; indicator organism; intestinal enterococci; irrigation water; photocatalytic treatment; Salmonella spp.; surface water

Published in

Acta Horticulturae
2011, Volume: 922, pages: 61-66
eISBN: 978-90-66055-34-6
Publisher: INTERNATIONAL SOCIETY HORTICULTURAL SCIENCE, PO BOX 500, 3001 LEUVEN 1, BELGIUM

Conference

28th Int Horticultural Congress on Science and Horticulture for People (IHC) / Int Symposium on Climwater - Horticultural Use of Water in a Changing Climate, AUG 22-27, 2010, Lisbon, PORTUGAL

SLU Authors

• Alsanius, Beatrix

  • Horticulture, Swedish University of Agricultural Sciences
    

• Alam, Mehboob

  • Horticulture, Swedish University of Agricultural Sciences
    

• Ahlström, Christine

  • Horticulture, Swedish University of Agricultural Sciences
    

• Rosberg, Anna Karin

  • Horticulture, Swedish University of Agricultural Sciences
    

• Jensén, Paul

  • Horticulture, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Horticulture


Permanent link to this page (URI)

https://res.slu.se/id/publ/118121