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Titolo:
Faecal bacteria and bacteriophage inactivation in a full-scale UV disinfection system used for wastewater reclamation
Autore:
Bourrouet, A; Garcia, J; Mujeriego, R; Penuelas, G;
Indirizzi:
Univ Politecn Catalunya, Dept Engn Hidraul Maritima & Ambiental, ETS Camins Canals & Ports, ES-08034 Barcelona, Spain Univ Politecn Catalunya Barcelona Spain ES-08034 -08034 Barcelona, Spain Junta Sanejament, Barcelona 08036, Spain Junta Sanejament Barcelona Spain 08036 anejament, Barcelona 08036, Spain
Titolo Testata:
WATER SCIENCE AND TECHNOLOGY
fascicolo: 10, volume: 43, anno: 2001,
pagine: 187 - 194
SICI:
0273-1223(2001)43:10<187:FBABII>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
BACTEROIDES-FRAGILIS; WATER;
Keywords:
UV disinfection; faecal bacteria; bacteriophages; somatic coliphages; water reuse; water reclamation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Bourrouet, A Univ Politecn Catalunya, Dept Engn Hidraul Maritima & Ambiental, ETS Camins Canals & Ports, Gran Capita S-N, ES-08034 Barcelona, Spain Univ Politecn Catalunya Gran Capita S-N Barcelona Spain ES-08034
Citazione:
A. Bourrouet et al., "Faecal bacteria and bacteriophage inactivation in a full-scale UV disinfection system used for wastewater reclamation", WATER SCI T, 43(10), 2001, pp. 187-194

Abstract

A study was carried out to compare the inactivation of faecal bacteria andone type of bacteriophage in a full-scale UV disinfection system. The system is part of a water reclamation facility for effluent reuse in golf course and agricultural irrigation. Influent and effluent samples were taken over two sampling periods (three consecutive days in July and one day in August), with three different UV doses applied each day (ranging from 10 to 40 mW.s/cm(2) and 20 to 80 mW.s/cm(2) in July and August, respectively). Effluent samples were also taken from a chlorine disinfection channel (5 mg Cl-2/L dose) operating in parallel to the UV system. Total coliforms (TC), faecal coliforms (FC), faecal streptoccoci (FS) and somatic coliphages (SC) weremeasured in each sample. F-specific RNA bacteriophages and bacteriophages of Bacteroides fragilis were also measured one day in July. The decay ratioobserved for all the microorganisms was similar when UV doses applied werelow (July), ranging from 1.15 to 1.25 log-units. This suggests that bacterial indicators may be suitable for virus inactivation control when low UV doses are applied; however, such low doses are inadequate to achieve effluent quality requirements for unrestricted irrigation. At higher UV doses (August), decay ratios for TC and FC were 3.1 and 2.8 log-units respectively, indicating that they were more susceptible to UV exposure than SC and FS, with decay ratios of 2.6 and 1.0 log-units, respectively. Nevertheless, thesehigher doses were also inadequate to achieve water quality requirements for unrestricted irrigation. The decay ratio of SC during chlorine disinfection was clearly lower than that of the other microorganisms. Bacteriophages of Bacteroides fragilis were more resistant to UV disinfection than SC and F-specific RNA. In fact, bacteriophages of Bacteroides fragilis were not affected during UV exposure. A UV dose ranging from 40 to 80 mW.s/cm2 marks the borderline beyond which inactivation rates of SC are clearly lower than those of bacterial indicators.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 23:21:19