Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Fate of the fecal indicator Escherichia coli in irrigation with partially treated wastewater |
| Abstract | Treated wastewater reuse is increasing in semi-arid regions as a response to the effects of climate change and increased competition for natural water resources. Investigating the fate of bacterial indicators is relevant to assess their persistence in the environment and possible transfer to groundwater or to the food chain. A long-term field-scale experimental campaign and a soil column test were carried out to evaluate the fate of the fecal indicator Escherichia coli (E. coli) in a cultivated soil when contaminated water resources are used for irrigation. For field experiments, fecal contamination was simulated by dosing the indicator to the effluent of a membrane bioreactor, thus simulating a filtration system's failure, and irrigating a test field where grass was grown. The presence of E. coli on grass and topsoil samples was monitored under different scenarios. For evaluating the fate of the same indicator in the subsoil, a set of soil columns was installed next to the field, operated, and monitored for E. coli concentration over time and along depth. Real municipal wastewater was used in this case as source of fecal contamination. Results showed that short- and medium-term effects on topsoil were strongly dependent on the concentration of E. coli in the irrigation water. Limited persistence and no relevant accumulation of the indicator on the grass and in the topsoil were observed. Watering events performed after fecal contamination did not influence significantly the decay in the topsoil, which followed a log-linear model. The trend of the E. coli concentrations in the leaching of the soil columns followed a log-linear model as well, suggesting bacterial decay as the dominant mechanism affecting the underground indicator's concentration. |
| Source | Water research (Oxf.) 85, pp. 66–73 |
| Keywords | Agricultural soilEscherichia coliFecal contaminationIrrigationWastewaterWater reuse |
| Journal | Water research (Oxf.) |
| Editor | Pergamon Press., New York, Regno Unito |
| Year | 2015 |
| Type | Articolo in rivista |
| DOI | 10.1016/j.watres.2015.08.001 |
| Authors | Vergine P.; Saliba R.; Salerno C.; Laera G.; Berardi G.; Pollice A. |
| Text | 338568 2015 10.1016/j.watres.2015.08.001 Scopus 2 s2.0 84939610005 ISI Web of Science WOS WOS 000363355700008 Agricultural soil Escherichia coli Fecal contamination Irrigation Wastewater Water reuse Fate of the fecal indicator Escherichia coli in irrigation with partially treated wastewater Vergine P.; Saliba R.; Salerno C.; Laera G.; Berardi G.; Pollice A. IRSA CNR, Viale F. De Blasio, 5, Bari, 70132, Italy; CIHEAM IAMB, Via Ceglie, 9, Valenzano Bari , 70010, Italy; Universita degli Studi di Napoli Parthenope, Via Amm. F. Acton, 38, Napoli, 80133, Italy Treated wastewater reuse is increasing in semi arid regions as a response to the effects of climate change and increased competition for natural water resources. Investigating the fate of bacterial indicators is relevant to assess their persistence in the environment and possible transfer to groundwater or to the food chain. A long term field scale experimental campaign and a soil column test were carried out to evaluate the fate of the fecal indicator Escherichia coli E. coli in a cultivated soil when contaminated water resources are used for irrigation. For field experiments, fecal contamination was simulated by dosing the indicator to the effluent of a membrane bioreactor, thus simulating a filtration system s failure, and irrigating a test field where grass was grown. The presence of E. coli on grass and topsoil samples was monitored under different scenarios. For evaluating the fate of the same indicator in the subsoil, a set of soil columns was installed next to the field, operated, and monitored for E. coli concentration over time and along depth. Real municipal wastewater was used in this case as source of fecal contamination. Results showed that short and medium term effects on topsoil were strongly dependent on the concentration of E. coli in the irrigation water. Limited persistence and no relevant accumulation of the indicator on the grass and in the topsoil were observed. Watering events performed after fecal contamination did not influence significantly the decay in the topsoil, which followed a log linear model. The trend of the E. coli concentrations in the leaching of the soil columns followed a log linear model as well, suggesting bacterial decay as the dominant mechanism affecting the underground indicator s concentration. 85 Published version http //www.scopus.com/inward/record.url eid=2 s2.0 84939610005 partnerID=q2rCbXpz Fate of the fecal indicator Escherichia coli in irrigation with partially treated wastewater 2015 Fate of the fecal indicator Ecoli in irrigation with partially treated WW WR.pdf Articolo in rivista Pergamon Press. 0043 1354 Water research Oxf. Water research Oxf. Water res. Oxf. Water research. Oxf. alfieri.pollice POLLICE ALFIERI giuseppe.laera LAERA GIUSEPPE giovanni.berardi BERARDI GIOVANNI pompilio.vergine VERGINE POMPILIO carlo.salerno SALERNO CARLO |