fa بررسی میزان اثربخشی تابش دیودهای پرتو فرابنفش با طول موج کوتاه درحالت تابش پیوسته و ناپیوسته در کاهش غلظت باکتری اشرشیاکلای فاضلاب wastewater پژوهشي Research <div style="text-align: justify;"><span style="font-size:11pt"><span style="line-height:150%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span style="font-family:Calibri,sans-serif"><b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">زمینه و هدف</span></span></span></b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">: استفاده از فتولیز فرابنفش در حذف آلودگی میکروبی می‌تواند استفاده از منابع آب فاضلابی را توسعه بخشد.</span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">در این پژوهش کارایی پرتو </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">UVC-LED</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:"> در حذف باکتری اشرشیا‌کلای در حالت تابش ناپیوسته در مقایسه با حالت تابش پیوسته مورد ارزیابی قرار گرفت.</span></span></span></span></span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:150%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span style="font-family:Calibri,sans-serif"><b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">روش بررسی</span></span></span></b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">:</span></span></span> <span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">به منظور انجام این تحقیق، از ۴ عدد </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">UVC-LED</span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:"> با طول موج کوتاه </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">MW</span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:"> ۱۲ برای تولید پرتو فرابنفش استفاده شد. </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">LED</span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:"> امواجی با طول موج</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times=""> nm </span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">280-260 ایجاد می‌کنند. فاصله قرارگیری</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">LED </span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">&nbsp;نسبت به صفحات، در حدود</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">cm </span></span><span style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">&nbsp;0/5، </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">&nbsp;cm</span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">1 و </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">&nbsp;cm</span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">2 در نظر گرفته شد. به منظور بررسی اثر تابش ناپیوسته بر عملکرد </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">UVC-LED</span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">، از فرکانس</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">Hz </span></span><span style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">&nbsp;2 و</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">Hz </span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">&nbsp;1 استفاده شد. در این حالت در هر</span></span></span> <span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">ثانیه منبع تغذیه به ترتیب 2 و 1 بار وصل می‌شود.</span></span></span> <span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">متغیرهای زمان تابش</span></span></span> <span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">(</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">t</span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">) بر حسب </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">s</span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">، فاصله تابش</span></span></span> <span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">(</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">d</span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">) بر حسب </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">cm</span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:"> و فرکانس تابش </span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">(</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">f</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">)</span></span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:"> برحسب </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">Hz</span></span><span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:"> جهت ارزیابی استفاده شد. </span></span></span></span></span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:150%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span style="font-family:Calibri,sans-serif"><b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">یافته</span></span></span></b><b><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">‌</span></span></b><b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">ها</span></span></span></b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">:</span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">نتایج نشان داد که در حالت تابش ناپیوسته، با افزایش زمان تابش، اثرگذاری افزایش یافته و عملا در زمان</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">‌</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">های بالای </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">s</span></span><span style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:"> 280 هیچ باکتری در نمونه</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">‌</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">ها باقی نماند. در فواصل تابش </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">&nbsp;cm</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">1، </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">&nbsp;cm</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">0/5، صفر و همچنین زمان تابش </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">&nbsp;s</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">20، عملکرد روش تابش ناپیوسته نسبت به تابش پیوسته در حذف باکتری ضعیف</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">‌</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">تر بود</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">.</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:"> بعد از زمان تابش </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">&nbsp;s</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">280 در فاصله </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">&nbsp;cm</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">2، میزان حذف باکتری در تابش ناپیوسته با میزان حذف باکتری در تابش پیوسته برابر لگاریتم حذف</span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">6 یا 99/9999 درصد</span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">می‌شود.</span></span></span></span></span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:150%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span style="font-family:Calibri,sans-serif"><b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">نتیجه</span></span></span></b><b><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">‌</span></span></b><b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">گیری</span></span></span></b><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">:</span></span></span> <span lang="AR-SA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" lotus="" style="font-family:">کارایی تابش ناپیوسته در مقایسه با تابش پیوسته از قدرت عملکردی خوبی برخوردار است. </span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:"B Lotus""></span></span></span></span></span></span></span></span><br> &nbsp;</div> <span style="font-size:11pt"><span style="line-height:150%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span sans-serif="" style="font-family:Calibri,"><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:"B Lotus""></span></span></span></span></span></span></span></span> <div style="text-align: justify;"><span style="font-size:11pt"><span style="line-height:115%"><span style="font-family:Calibri,sans-serif"><b><span new="" roman="" style="font-family:" times="">Background and Objective</span></b><span new="" roman="" style="font-family:" times="">: The application of ultraviolet photolysis in the removal of microbial contamination can develop the use of wastewater sources. In this research, the efficiency of</span><span style="line-height:115%"><span new="" roman="" style="font-family:" times=""> UVC-LED</span></span><span new="" roman="" style="font-family:" times=""> for removing Escherichia coli was evaluated in pulsed radiation mode with continuous radiation. </span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:115%"><span style="font-family:Calibri,sans-serif"><b><span new="" roman="" style="font-family:" times="">Materials and Methods:</span></b><span new="" roman="" style="font-family:" times=""> 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.</span><span style="line-height:115%"><span style="font-family:"Times New Roman",serif"></span></span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:115%"><span style="font-family:Calibri,sans-serif"><b><span new="" roman="" style="font-family:" times="">Results</span></b><span new="" roman="" style="font-family:" times="">: 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.</span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:115%"><span style="font-family:Calibri,sans-serif"><b><span new="" roman="" style="font-family:" times="">Conclusion</span></b><span new="" roman="" style="font-family:" times="">: The efficiency of pulsed radiation was greater as compared to continuous radiation. </span></span></span></span><br> &nbsp;</div> باکتری فاضلابی, پرتو فرابنفش, دیود نورگسیل, تابش ناپیوسته, تابش پیوسته Sewage bacteria, Ultraviolet, Nordsill diode, Pulsed radiation, Continuous radiation 345 360 http://ijhe.tums.ac.ir/browse.php?a_code=A-10-941-5&slc_lang=fa&sid=1 Elham Asrari الهام اسراری e_asrari@pnu.ac.ir Yes Department of Civil Engineering, Payame Noor University, Tehran, Iran گروه فنی و مهندسی، دانشگاه پیام نور، تهران، ایران Hedieh Deyhim هدیه دیهیم h.dayhim@yahoo.com No Department of Civil Engineering, Payame Noor University, Shiraz, Iran گروه فنی و مهندسی، دانشگاه پیام نور، شیراز، ایران