Microbiological indicators of water quality in the Xochimilco canals, Mexico City
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Instituto Nacional de Salud Pública
2003
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| _version_ | 1876442284103303168 |
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| author | Luis Alfredo Juárez |
| author_facet | Luis Alfredo Juárez |
| contents | Microbiological indicators of water quality in the Xochimilco canals, Mexico City Luis Alfredo Juárez Jesús Silva Felipe Javier Uribe Enrique Cifuentes Salud Mexico sanitation water quality fecal contamination Objective. To quantify microbiology indicators of fecal contaminationin the effluents of two waste water treatmentplants and in samples collected in several canals in Xochimilco.Material and Methods. A cross sectional study wasperformed. Ten sites, 5 from plant effluents and 5 from canals,were selected for sampling during November andDecember 2001. Fecal coliforms and enterococci were quantifiedby membrane filtration, male specific (F+) and somaticcoliphages by double agar layer technique, and Cryptosporidiumoocysts and Giardia cysts by concentration with Envirocheckfilter followed by immunofluorescence microscopyquantification.The average of organisms counts from effluentsand canal water were compared with t Student test.Results. Treated water discharge in canals showed a lowcount of Fecal Coliforms (average 40.4/100 ml), enterococci(average 58.8/100 ml) and Cryptosporidium oocysts (average13.2/100 l), while coliphages and Giardia cyst renderedhigher counts (average 1467.5/100 ml and 1199.8/100 l, respectively)suggesting the water treatment methods couldfail to remove these agents. A significant lower count ofGiardia cysts (average 45/100 l) and no Cryptosporidiumoocysts were found in irrigation canals, which suggests anatural clearance of these pathogens. Strains of Escherichiacoli isolated in one of the canals contaminated with sewagehad antimicrobial multi-resistance that was transferred byconjugation suggesting that resistance is encoded in a plasmidpotentially transferable to other pathogenic bacteria. Conclusions. Cost effective and culturally acceptablewaste treatment methods will require careful planning andconsultation if they are to be adopted and mantained bylocal populations. 2003 artículo científico 0036-3634 https://www.redalyc.org/articulo.oa?id=10645509 en http://www.redalyc.org/revista.oa?id=106 Salud Pública de México application/pdf Instituto Nacional de Salud Pública Salud Pública de México (México) Num.5 Vol.45 |
| format | Artículo científico |
| id | redalyc_10645509 |
| institution | Redalyc |
| language | en |
| publishDate | 2003 |
| publisher | Instituto Nacional de Salud Pública |
| spellingShingle | Microbiological indicators of water quality in the Xochimilco canals, Mexico City Luis Alfredo Juárez Salud Mexico sanitation water quality fecal contamination Microbiological indicators of water quality in the Xochimilco canals, Mexico City Luis Alfredo Juárez Jesús Silva Felipe Javier Uribe Enrique Cifuentes Salud Mexico sanitation water quality fecal contamination Objective. To quantify microbiology indicators of fecal contaminationin the effluents of two waste water treatmentplants and in samples collected in several canals in Xochimilco.Material and Methods. A cross sectional study wasperformed. Ten sites, 5 from plant effluents and 5 from canals,were selected for sampling during November andDecember 2001. Fecal coliforms and enterococci were quantifiedby membrane filtration, male specific (F+) and somaticcoliphages by double agar layer technique, and Cryptosporidiumoocysts and Giardia cysts by concentration with Envirocheckfilter followed by immunofluorescence microscopyquantification.The average of organisms counts from effluentsand canal water were compared with t Student test.Results. Treated water discharge in canals showed a lowcount of Fecal Coliforms (average 40.4/100 ml), enterococci(average 58.8/100 ml) and Cryptosporidium oocysts (average13.2/100 l), while coliphages and Giardia cyst renderedhigher counts (average 1467.5/100 ml and 1199.8/100 l, respectively)suggesting the water treatment methods couldfail to remove these agents. A significant lower count ofGiardia cysts (average 45/100 l) and no Cryptosporidiumoocysts were found in irrigation canals, which suggests anatural clearance of these pathogens. Strains of Escherichiacoli isolated in one of the canals contaminated with sewagehad antimicrobial multi-resistance that was transferred byconjugation suggesting that resistance is encoded in a plasmidpotentially transferable to other pathogenic bacteria. Conclusions. Cost effective and culturally acceptablewaste treatment methods will require careful planning andconsultation if they are to be adopted and mantained bylocal populations. 2003 artículo científico 0036-3634 https://www.redalyc.org/articulo.oa?id=10645509 en http://www.redalyc.org/revista.oa?id=106 Salud Pública de México application/pdf Instituto Nacional de Salud Pública Salud Pública de México (México) Num.5 Vol.45 |
| title | Microbiological indicators of water quality in the Xochimilco canals, Mexico City |
| topic | Salud Mexico sanitation water quality fecal contamination |
| url | https://www.redalyc.org/articulo.oa?id=10645509 |