Effectiveness of Ultraviolet-C light diode radiation using pulsed and continuous radiation in reducing the concentration of Escherichia coli
Background and Objective: The application of ultraviolet photolysis in the removal of microbial contamination can develop the use of wastewater sources. In this research, the efficiency of UVC-LED for removing Escherichia coli was evaluated in pulsed radiation mode with continuous radiation. Materi...
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| Format: | Article |
| Language: | fas |
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Tehran University of Medical Sciences
2022-08-01
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| Series: | سلامت و محیط |
| Subjects: | |
| Online Access: | http://ijhe.tums.ac.ir/article-1-6660-en.html |
| _version_ | 1828159015753875456 |
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| author | Elham Asrari Hedieh Deyhim |
| author_facet | Elham Asrari Hedieh Deyhim |
| author_sort | Elham Asrari |
| collection | DOAJ |
| description | Background and Objective: The application of ultraviolet photolysis in the removal of microbial contamination can develop the use of wastewater sources. In this research, the efficiency of UVC-LED for removing Escherichia coli was evaluated in pulsed radiation mode with continuous radiation.
Materials and Methods: In order to conduct this research, 4 UVC-LEDs with a short wavelength of 12 MW were used to produce ultraviolet rays. LEDs create waves with a wavelength of 260-280 nm. The distance between the LED and the plates was considered to be about 0.5 cm, 1 cm, and 2 cm. In order to investigate the effect of discontinuous radiation on UVC-LED performance, 2 Hz and 1 Hz frequency were used. In this case, the power source is connected 2 times and 1 time respectively in every second. The variables of radiation time (t) in seconds, radiation distance (d) in centimeters, and radiation frequency (f) in Hz were used for valuation.
Results: The results showed that in discontinuous irradiation, although the effectiveness increases with the increase of irradiation time, and practically at times higher than 280 seconds, bacteria do not remain in the samples, but the performance of discontinuous irradiation compared to continuous irradiation in removing bacteria at irradiation intervals of 1 cm, 0.5 cm and time 20 s has only achieved logarithm 4 or in other words 99.99% removal, which is considered the weakest performance of continuous radiation. Also, in the discontinuous radiation mode, after 280 s time and 2 cm distance, the radiation performance towards the complete removal of bacteria is equal to the logarithm of 6 or 99.999%, which is equal to the amount of bacteria removal in continuous radiation.
Conclusion: The efficiency of pulsed radiation was greater as compared to continuous radiation. |
| first_indexed | 2024-04-11T23:53:14Z |
| format | Article |
| id | doaj.art-afe254648e28401285c1c7042df13d7b |
| institution | Directory Open Access Journal |
| issn | 2008-2029 2008-3718 |
| language | fas |
| last_indexed | 2024-04-11T23:53:14Z |
| publishDate | 2022-08-01 |
| publisher | Tehran University of Medical Sciences |
| record_format | Article |
| series | سلامت و محیط |
| spelling | doaj.art-afe254648e28401285c1c7042df13d7b2022-12-22T03:56:25ZfasTehran University of Medical Sciencesسلامت و محیط2008-20292008-37182022-08-01152345360Effectiveness of Ultraviolet-C light diode radiation using pulsed and continuous radiation in reducing the concentration of Escherichia coliElham Asrari0Hedieh Deyhim1 Department of Civil Engineering, Payame Noor University, Tehran, Iran Department of Civil Engineering, Payame Noor University, Shiraz, Iran Background and Objective: The application of ultraviolet photolysis in the removal of microbial contamination can develop the use of wastewater sources. In this research, the efficiency of UVC-LED for removing Escherichia coli was evaluated in pulsed radiation mode with continuous radiation. Materials and Methods: In order to conduct this research, 4 UVC-LEDs with a short wavelength of 12 MW were used to produce ultraviolet rays. LEDs create waves with a wavelength of 260-280 nm. The distance between the LED and the plates was considered to be about 0.5 cm, 1 cm, and 2 cm. In order to investigate the effect of discontinuous radiation on UVC-LED performance, 2 Hz and 1 Hz frequency were used. In this case, the power source is connected 2 times and 1 time respectively in every second. The variables of radiation time (t) in seconds, radiation distance (d) in centimeters, and radiation frequency (f) in Hz were used for valuation. Results: The results showed that in discontinuous irradiation, although the effectiveness increases with the increase of irradiation time, and practically at times higher than 280 seconds, bacteria do not remain in the samples, but the performance of discontinuous irradiation compared to continuous irradiation in removing bacteria at irradiation intervals of 1 cm, 0.5 cm and time 20 s has only achieved logarithm 4 or in other words 99.99% removal, which is considered the weakest performance of continuous radiation. Also, in the discontinuous radiation mode, after 280 s time and 2 cm distance, the radiation performance towards the complete removal of bacteria is equal to the logarithm of 6 or 99.999%, which is equal to the amount of bacteria removal in continuous radiation. Conclusion: The efficiency of pulsed radiation was greater as compared to continuous radiation.http://ijhe.tums.ac.ir/article-1-6660-en.htmlsewage bacteriaultravioletnordsill diodepulsed radiationcontinuous radiation |
| spellingShingle | Elham Asrari Hedieh Deyhim Effectiveness of Ultraviolet-C light diode radiation using pulsed and continuous radiation in reducing the concentration of Escherichia coli سلامت و محیط sewage bacteria ultraviolet nordsill diode pulsed radiation continuous radiation |
| title | Effectiveness of Ultraviolet-C light diode radiation using pulsed and continuous radiation in reducing the concentration of Escherichia coli |
| title_full | Effectiveness of Ultraviolet-C light diode radiation using pulsed and continuous radiation in reducing the concentration of Escherichia coli |
| title_fullStr | Effectiveness of Ultraviolet-C light diode radiation using pulsed and continuous radiation in reducing the concentration of Escherichia coli |
| title_full_unstemmed | Effectiveness of Ultraviolet-C light diode radiation using pulsed and continuous radiation in reducing the concentration of Escherichia coli |
| title_short | Effectiveness of Ultraviolet-C light diode radiation using pulsed and continuous radiation in reducing the concentration of Escherichia coli |
| title_sort | effectiveness of ultraviolet c light diode radiation using pulsed and continuous radiation in reducing the concentration of escherichia coli |
| topic | sewage bacteria ultraviolet nordsill diode pulsed radiation continuous radiation |
| url | http://ijhe.tums.ac.ir/article-1-6660-en.html |
| work_keys_str_mv | AT elhamasrari effectivenessofultravioletclightdioderadiationusingpulsedandcontinuousradiationinreducingtheconcentrationofescherichiacoli AT hediehdeyhim effectivenessofultravioletclightdioderadiationusingpulsedandcontinuousradiationinreducingtheconcentrationofescherichiacoli |