عملکرد فرایندهای میکروفیلتراسیون و اولترافیلتراسیون در استفاده مجدد از آب شستشوی معکوس فیلترهای شنی تصفیه‌خانه‌های آب شهری

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مهندسی محیط زیست، دانشکده محیط زیست و انرژی، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران

2 دانشیار دانشکده محیط زیست و انرژی،دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران

3 استاد دانشکده محیط زیست ،دانشگاه تهران

4 دانشیار، دانشکده محیط زیست و انرژی، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران

چکیده

هدفازاینپژوهش،به‌کارگیریفرایندهایغشایی میکروفیلتراسیون و اولترافیلتراسیون به‌منظوربهبود کیفیت فیزیکی و میکربی و استفاده مجدد از پساب شستشوی فیلترهای شنی تصفیه‌خانه‌های آب بود. پساب شستشوی معکوس فیلترها 3 تا 5 درصد کل آب تصفیه شده را تشکیل می‌دهدکه در اکثر تصفیه‌خانه‌ها این پساب دفع می‌شود. اما با توجه به بحران آب ،تصفیه و برگشت آن به ابتدای تصفیه‌خانه از نظر فنی و اقتصادی مناسب‌تر است.دراینپژوهشدرمقیاسپایلوتاز مدول‌هایغشاییمیکروفیلترواولترافیلتراستفادهشد. پس از نمونه‌برداری از پساب، بر اساس دستورالعمل‌های کتاب روش‌های استاندارد، درصد حذف پارامترهای مورد نظر نسبت به زمان، در سه فرایند میکرو فیلتراسیون، اولترافیلتراسیون و فرایند ترکیبی میکروفیلتراسیون و اولترافیلتراسیون بررسی شد. نتایج نشان داد که ترکیب میکروفیلتر و اولترافیلتراسیون قادر است پارامترهای کدورت، MPN،COD،TSS و آهن را به‌ترتیب برابر 9/99 ،100 ، 5/61 ، 9/99 و 8/98 درصد کاهش دهد. در مجموع قابلیت‌های فنی این روش برای بازیابی پساب حاصل از شستشوی معکوس فیلترهای شنی تصفیه‌خانه‌های آب شهری تأیید شد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of the MF/UF Performance for the Reuse of Sand Filter Backwash Water from Drinking Water Treatment Plants

نویسندگان [English]

  • Neda Shirzadi 1
  • Amir Hasani 2
  • Ali Torabian 3
  • Amir javid 4
1 MSc Student of Environmental Engineering, Faculty of Environment and Energy, Islamic Azad University, Sciences and Research Branch, Tehran
2 Assoc. Prof., Faculty of Environment and Energy, Islamic Azad University Sciences and Research Branch, Tehran
3 Prof., Faculty of Environment, Tehran University, Tehran
4 Assoc. Prof., Faculty of Environment and Energy, Islamic Azad University Sciences and Research Branch, Tehran
چکیده [English]

The aim of this study was to investigate the application of micro-filtration and ultra-filtration membrane systems in order to improve the physical and microbial quality and the reuse of backwash water from the sand filter units in water treatment plants. The backwash water from filters makes up for 3 to 5 percent of the total water treated, which is disposed in most WTPs. However, the treatment and reuse of the backwash water is more admissible from technical and economic viewpoints, especially in view of the present water scarcity. For the purposes of this study, use was made of membrane modules of micro- and ultra-filters on a pilot scale. The micro-filter employed consisted of a polypropylene membrane module with a porosity of 1 micron in size and a fiberglass module with a porosity of 5 microns. The ultra-filter was made of PVC hollow fiber with a molecular weight of 100,000 Dalton. In order to feed the two pilots, backwash water from a sand filter was collected from one of the WTPs in Tehran. After samples were taken from the backwash water, the physical and microbial removal efficiency was periodically evaluated based on the standard method and the micro-filtration, ultra-filtration, and combined MF/UF processes were compared with respect to their performance. The results indicate that the combined MF/UF process is able to decrease turbidity, MPN, COD, TSS, and Fe with efficiency values of 99.9, 100, 61.5, 99.9 and 98.8 percent, respectively. Overall, the findings confirmed the technical capabilities of this method for the recovery and reuse of the effluent produced in the backwashing mechanism of sand filters in WTPs.

کلیدواژه‌ها [English]

  • Membrane Process
  • MF/UF
  • Backwash Water
  • Sand Filter
  • Reuse
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