Iranian Journal of Health and Environment
سلامت و محیط زیست
ijhe
Medical Sciences
http://ijhe.tums.ac.ir
1
admin
2008-2029
2008-3718
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fa
jalali
1400
6
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gregorian
2021
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online
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امکان سنجی تصفیه لجنهای تولیدی در تصفیهخانه فاضلاب شهری با کاربرد روش ازنزنی
Feasibility of treating the produced sludge in municipal wastewater treatment plant using ozonation method
فاضلاب
wastewater
پژوهشي
Research
<div style="text-align: justify;"><strong><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="background:white;font-weight:bold;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">زمینه و هدف: </span></span></span></span></span></span></span></strong><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">تصفیه و تثبیت لجن فاضلاب همواره هزینهها و متعاقب آن انرژی بسیار زیادی را به تصفیهخانههای فاضلاب تحمیل میکند. جهت دستیابی به تصفیه و تثبیت هرچه بیشتر لجن، شکستن اجزای پیچیده به اجزای ساده</span></span></span></span></span></span><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">تر بهعنوان یک مرحله حیاتی در نظر گرفته میشود. لذا، مطالعه حاضر با هدف امکان سنجی تصفیه لجن تولیدی در تصفیهخانه فاضلاب شهری با کاربرد روش ازنزنی انجام شد. </span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;"></span></span></span></span></span><br>
<strong><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="background:white;font-weight:bold;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">روش بررسی</span></span></span></span></span></span></span></strong>: <span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">در این مطالعه لجن از خط برگشت لجن فعال از تصفیه</span></span></span></span></span></span><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">خانه فاضلاب جنوب تهران برداشت شد. یک ژنراتور ازن با سرعت تخلیه </span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;">L/min</span></span></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> 3 و با غلظت ازن </span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;">mg/L</span></span></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> 35-40 به راکتور واکنش تخلیه و سنجش غلظت ازن باقیمانده به روش یدومتری صورت گرفت. درنهایت، شاخص</span></span></span></span></span></span><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">های میزان جامدات معلق کل (</span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;">TSS</span></span></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">) و فرار (</span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;">VSS</span></span></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">)، اکسیژن موردنیاز شیمیایی محلول (</span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;">SCOD</span></span></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">)، کربن آلی کل (</span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;">TOC</span></span></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">)</span></span></span></span></span></span> <span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">و اکسیژن موردنیاز بیوشیمیایی محلول (</span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;">SBOD</span></span></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">) در طول فرایندهای ازنزنی با استفاده از روش استاندارد متد مورد اندازهگیری قرار گرفتند. </span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;"></span></span></span></span></span><br>
<strong><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="background:white;font-weight:bold;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">یافتهها: </span></span></span></span></span></span></span></strong><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">نتایج این تحقیق آشکار ساخت که در طول فرایند ازن</span></span></span></span></span></span><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">زنی، میزان </span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;">TSS</span></span></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> و </span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;">VSS</span></span></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> لجن برگشتی فرایند لجن فعال به ترتیب از </span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;">mg/L</span></span></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> 4060 به </span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;">mg/L</span></span></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> 2100 و از </span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;">mg/L</span></span></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> 3300 به </span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;">mg/L</span></span></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> 1850 کاهش یافت. اما </span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;">SCOD</span></span></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">، </span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;">TOC</span></span></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> و </span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;">SBOD</span></span></span></span></span><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;"> در مدت زمان مشابه واکنش بهترتیب در حدود 18، 11/7 و 14 برابر سیر صعودی داشتند.</span></span></span></span></span></span><span style="font-family:Times New Roman;"><span style="color:#0d0d0d;"><span dir="LTR"><span style="color:#0d0d0d;"><span style="font-family:Times New Roman,serif;"></span></span></span></span></span><br>
<strong><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="background:white;font-weight:bold;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">نتیجهگیری: </span></span></span></span></span></span></span></strong><span style="font-size:medium;"><span style="font-family:B Lotus;"><span style="color:#0d0d0d;"><span style="color:#0d0d0d;"><span style="font-family:B Lotus;"><span style="font-size:12.0pt;">با توجه به نتایج بهدست آمده از این تحقیق میتوان نتیجه گرفت که سیستم ازنزنی میتواند به عنوان یک فرایند مناسب جهت تجزیه لجنهای تولیدی در تصفیهخانههای فاضلاب و افزایش قابلیت زیست تجزیه شوندگی این لجنها مورد پیشنهاد قرار گیرد. </span></span></span></span></span></span></div>
<div style="text-align: justify;"><strong>Background and Objective: </strong>Wastewater treatment and stabilization always imposes costs and consequently a lot of energy on wastewater treatment plants. To achieve the purification and stabilization of as much sludge as possible<span dir="RTL">,</span> breaking complex components into simpler components is considered a critical step. Therefore, this study aimed to evaluate the feasibility of treating the produced sludge in the municipal wastewater treatment plant using ozonation method.<br>
<strong>Materials and Methods: </strong>In this study, sludge was obtained from the return line of activated sludge from the wastewater treatment plant in the south of Tehran. An ozonation generator with a discharge rate of 3 L/min and an ozone concentration of 40-35 mg/L was discharged to the reactor and the residual ozone concentration was measured by iodometric method. Finally, the total suspended solids and volatile, soluble chemical oxygen demand, total organic carbon, and biochemical oxygen demand during ozonation processes were measured using the Standard Method.<br>
<strong>Results: </strong>The results of this study showed that the amount of TSS and VSS in the activated return sludge decreased from 4060 to 2100 mg/L and from 3300 to 1850 mg/L during the ozonation process, respectively. However, SCOD, TOC, and SBOD had an upward trend of about 18, 11.7, and 14 times in the same reaction time, respectively.<br>
<strong>Conclusion</strong>: According to the results of this study, it can be concluded that the ozonation system can be proposed as a suitable process for the decomposition of sludge produced in wastewater treatment plants and increasing the biodegradability of these sludges<span dir="RTL">.</span></div>
ازنزنی, تصفیه لجن, تصفیه خانه فاضلاب
Ozonation, Sludge treatment, Municipal wastewater treatment plant
351
362
http://ijhe.tums.ac.ir/browse.php?a_code=A-10-714-5&slc_lang=fa&sid=1
Mohsen
Ansari
محسن
انصاری
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