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Environmental Science and Pollution Research

, Volume 20, Issue 5, pp 3003–3010 | Cite as

Determination of fecal contamination origin in reclaimed water open-air ponds using biochemical fingerprinting of enterococci and fecal coliforms

  • Arnau Casanovas-MassanaEmail author
  • Anicet R. Blanch
Research Article

Abstract

Low levels of fecal indicator bacteria (FIB) were recently detected in two reclaimed water open-air ponds used to irrigate a golf course located in Northeastern Spain. The aim of this study was to evaluate the feasibility of a biochemical fingerprinting method to track the origin of fecal contamination in water with low FIB levels, as in the aforementioned ponds. We also aimed to determine whether FIB presence was due to regrowth of the reclaimed water populations or to a contribution of fecal matter whose source was in the golf facility. Three hundred and fifty enterococcal strains and 308 fecal coliform strains were isolated from the ponds and reclamation plant, and they were biochemically phenotyped. In addition, the inactivation of several microbial fecal pollution indicators (fecal coliforms, total bifidobacteria, sorbitol-fermenting bifidobacteria, somatic bacteriophages, and bacteriophages infecting Bacteroides thetaiotaomicron) was studied using a mesocosm in situ in order to obtain information about their decay rate. Although FIB concentration was low, the biochemical fingerprinting provided evidence that the origin of the fecal contamination in the ponds was not related to the reclaimed water. Biochemical fingerprinting thus proved to be a successful approach, since other microbial source-tracking methods perform poorly when dealing with low fecal load matrices. Furthermore, the mesocosm assays indicated that none of the microbial fecal indicators was able to regrow in the ponds. Finally, the study highlights the fact that reclaimed water may be recontaminated in open-air reservoirs, and therefore, its microbial quality should be monitored throughout its use.

Keywords

Biochemical fingerprinting Enterococci Fecal coliforms Reclaimed water reservoir Microbial source tracking Recontamination 

Notes

Acknowledgments

The authors thank the Consorci de la Costa Brava for its help with the sampling and Dr. Javier Méndez from the University of Barcelona for his help with the statistical analysis. This study was supported by the Xarxa de Referència en Biotecnologia. Arnau Casanovas-Massana was supported by a grant from the Spanish Ministry of Education.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Departament of MicrobiologyUniversity of BarcelonaBarcelonaSpain

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