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Titolo:
In situ measurement and statistical modelling of Escherichia coli decay insmall rivers
Autore:
Beaudeau, P; Tousset, N; Bruchon, F; Lefevre, A; Taylor, HD;
Indirizzi:
Lab Etud & Anal Ville Havre, F-76600 Le Havre, France Lab Etud & Anal Ville Havre Le Havre France F-76600 600 Le Havre, France Agence Eau Seine Normandie, Direct Rivages Normands, F-14600 Honfleur, France Agence Eau Seine Normandie Honfleur France F-14600 4600 Honfleur, France Univ Brighton, Sch Environm, Brighton BN2 4GJ, E Sussex, England Univ Brighton Brighton E Sussex England BN2 4GJ N2 4GJ, E Sussex, England
Titolo Testata:
WATER RESEARCH
fascicolo: 13, volume: 35, anno: 2001,
pagine: 3168 - 3178
SICI:
0043-1354(200109)35:13<3168:ISMASM>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLAR-RADIATION; SURVIVAL; BACTERIA; WATER; SEAWATER; ENUMERATION; FLAGELLATE; SALMONELLA; KINETICS; SUNLIGHT;
Keywords:
Escherichia coli; rivers; decay model; flow; temperature; SPM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Beaudeau, P Lab Etud & Anal Ville Havre, 70 Quai Frissard, F-76600 Le Havre, France Lab Etud & Anal Ville Havre 70 Quai Frissard Le Havre France F-76600
Citazione:
P. Beaudeau et al., "In situ measurement and statistical modelling of Escherichia coli decay insmall rivers", WATER RES, 35(13), 2001, pp. 3168-3178

Abstract

Numerous studies have been carried out on the environmental factors associated with the decay of faecal bacteria in open (fresh or marine) waters. The present study aimed at understanding the fate of bacteria in small streams (flow < 20 m(3) s(-1)) for which there is a lack of knowledge. An original in situ protocol was developed for measuring the die-off of Escherichia coli (E. coh) from wastewater treatment Plants. Based upon 80 values of the decay first-order parameter (K or its inverse T90), collected from five rivers in Normandy (France), a median T90 of 10 It and a minimal T90 of 1.3 h were obtained. K was then modelled as a linear function of variables made up from flow, water temperature and suspended particulate matter (SPM). The set of significant co-variables did not include light indicators. E. coli decay is inversely related to the river flow and it becomes highly significant below 0.3 m(3) s-1. The positive effect of small flows on die-off is increased by water temperature over 15<degrees>C. whereas it could be reduced by SPM. The major co-variable of the model (p< 10(-9)) is an empiric composite variable integrating the effect of flow and temperature that explains more than 40% of the variance of K. We interpreted this as kin expression ofpredation by benthic micro-grazers which could be the main cause of E. coli die-off in small streams in temperate countries. (C) 2001 Elsevier Science Ltd. All rights reserved

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/04/20 alle ore 22:50:16