Performance of Ultrasonic Process on Removal of Fecal Indicator Bacteria of Escherichia Coli and Enterococcus Faecalis from Drinking Water
| Autor: | Gholami M, Dehghanifard E, Zarghampour Z, Mirzaei R, Dehghani Nayeri M |
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| Jazyk: | English<br />Persian |
| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Majallah-i Dānishgāh-i ̒Ulūm-i Pizishkī-i Bābul, Vol 14, Iss 1, Pp 36-41 (2011) |
| Druh dokumentu: | article |
| ISSN: | 1561-4107 2251-7170 |
| Popis: | BACKGROUND AND OBJECTIVE: Conventional processes of drinking water disinfection could not completely remove contamination indicator bacteria. So, application of new technologies like ultrasonic process has been considered for drinking water disinfection. In this study, the performance of the ultrasonic process on removal of E. coli and E. faecalis from drinking water was evaluated.METHODS: In this cross-sectional study, synthetic solution contained E. coli and E. faecalis with populations of 103, 105, 107 and 109 cfu/mL (Colony Forming Unit/ milliliter) were used. After microbial seeding, drinking water samples were exposed to ultrasonic waves with the cycle of 2, 6 and 10 Pulse/s in 5 and 10 minutes. A measurement criterion of the disinfection performance was removal efficiency of indicator bacteria. Microbial colonies were counted by McFarland and plate count methods. The ultrasonic power and microbial concentration in the process of inactivation of bacteria were compared by using McFarland method.FINDINGS: In this study, the removal performance of E. coli with colony density of 103 cfu/mL and the sonication cycle of 2 pulse/s was 1.1 log, while in the sonication cycles of 6 and 10 pulse/s was 3 log (p |
| Databáze: | Directory of Open Access Journals |
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