پروژه Microorganisms inactivation by continuous and pulsed irradia شامل چه جزئیاتی است:

پروژه در مورد لامپ های uv  است که کلمات تخصصی زیادی ندارد.نیاز به ترجمه فوری


Ultraviolet light-emitting diode (UV-LED) is an emerging UV source and has a number of features that do not

exist in conventional mercury based UV lamps. One such feature is the ability to turn the radiation on and off

with a high frequency, which enables pulsed irradiation with flexible pulse patterns by UV-LEDs. In this study,

the inactivation of different microorganisms by continuous and pulsed irradiation was investigated using UVLEDs,

in order to utilize this unique feature to distinguish the effect of pulsation on inactivation, and to explore

the potential benefits of UV-LEDs pulsed irradiation for water disinfection. The analysis was based on the

equivalent UV fluence between continuous and pulsed irradiation using two types of actinometry techniques

(iodide-iodate and ferrioxalate) for UV fluence determination. The disinfection study involved the inactivation of

E. coli and coliphage MS2 in laboratory water, as well as E. coli and total coliform in wastewater. The effects of

pulse patterns including frequency (i.e., the number of on-off cycles per second) and duty rate (i.e., the percentage

of irradiation time in each on-off cycle) on the inactivation effectiveness were also examined for these

microorganisms. The results showed comparable inactivation of all the examined microorganisms by 265 nm

UV-LED continuous and pulsed irradiation with various pulse patterns under equivalent UV fluence. The findings

in this study were compared with those from conventional xenon lamps pulsed irradiation studies, which not

only distinguished the role of pulsed UV irradiation on microorganisms inactivation, but also revealed a key

feature of UV-LEDs pulsed irradiation with respect to improved thermal management, potentially affecting

application of high output UV-LEDs for water disinfection.

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