The Disinfection of Escherichia coli by Ultraviolet Intensity and Ultrasound Power

Year 2016, Volume: 1 Issue: 1, 13 - 19, 31.12.2016

Arzu Görmez , Tuba Yetim

Abstract

Physical, chemical and biological
constituents such as organic compounds and microorganisms are released by
wastewaters from fabrics, homes, facilities and other resources. Bacteria,
viruses and fungi can be described as microbial pollutants. In this study the
disinfection of Escherichia coli O157:H7 strain from the wastewater was aimed
by using ultrasound power and ultraviolet light intensity. The 60% amplitude of
ultrasound energy and also, 88 W/m2 light intensity at 254 nm wavelength was
used. The ultrasound source was an ultrasonic generator and the ultraviolet
light source was Pen-Ray ultraviolet lamp. The temperature was constant at 37°C
temperature and the amount of TiO2 was 300 mg during the experiments. For
investigating the effect of ultrasound energy, it was used alone to the system.
Also, for the effect of ultraviolet light, it was used alone to the system. For
the synergistic effect of ultrasound and ultraviolet, they were used together
to the system. The results showed that the completely disappearance was seen at
30 min. when the ultraviolet light (UV) was used alone, 40 min. when the
ultrasound (US) was used alone and 8 min when the ultrasound and the
ultraviolet light were used simultaneously. The most disinfection was
determined when the ultrasound and the ultraviolet light were used
simultaneously. Together using of the sound and light energies proved to be the
most effective process on bacterial disinfection by generating greater •OH radicals.
Also, having more piercing and devastating properties of 254 nm wavelength, it
was seen more effective disinfection in this study.  

Keywords

Ultrasound, ultraviolet light, Escherichia coli

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