مطالعه میزان تصفیه پذیری آب خاکستری با استفاده از جذب سطحی با نانوذرات آهن
الموضوعات :
سعید گواهی
1
,
ehsan derikvand
2
,
صایب خوشنواز
3
,
محسن سلیمانی بابرصاد
4
,
Iman Parseh
5
1 - دانشجو دکتری گروه عمران، واحد شوشتر، دانشگاه آزاد اسلامی، شوشتر، ایران
2 - Department of Water Science,
Shoushtar Branch, Islamic Azad University, Shoushtar, Iran
3 -
4 - عضو هیات علمی گروه آبیاری دانشگاه آزاد اسلامی واحد شوشتر
5 - Behbahan Faculty of Medical Sciences, Behbahan, Iran
الکلمات المفتاحية: آب اکسیژنه, اکسیداسیون, بیولوژیکی, تصفیه, خاکستری, فرابنفش,
ملخص المقالة :
در جوامع بشری، منابع بسیاری برای بازیافت وجود دارد که یکی از مهم‌ترین آنها آب‌های خاکستری است. این آب‌ها که گاهاً به دلیل وجود ترکیبات آلی تجزیه ناپذیر نیاز به تصفیه با روش‌های پیشرفته غیربیولوژیکی دارند، در این پژوهش با استفاده از نانوذرات اکسید آهن Fe3O4 تصفیه شده‌اند. آب آلوده خروجی از فرآیندهای بیولوژیکی و اکسیداسیون شیمیایی، با غلظت اولیه COD، BOD، TKN و TP به ترتیب 170، 40،3.9 و0.4 میلی‌گرم بر لیتر، در معرض نانوذرات آهن قرار گرفت. نتایج نشان داد که برای حذف حداکثر آلاینده‌ها، به1.2 گرم بر لیتر نانوذرات آهن نیاز است. با بهینه‌سازی شرایط، راندمان حذف COD، BOD، TKN و TP به ترتیب به 57، 36، 7.5 و60 درصد در pH=5 و زمان تماس 40 دقیقه رسید. بررسی‌ها نشان داد که تغییرات pH تاثیر چندانی بر حذف BOD، فسفات و نیترات ندارد، در حالی که حذف COD در pH های پایین کارآمدتر است. همچنین، همبستگی بین حذف آلاینده‌ها و مدل فروندلیخ به ترتیب 98.2،53.6 ،98.8 و 97.7 درصد بود. بر خلاف انتظار، مقدار حداکثر جذب تعادلی (qmax) در مدل لانگمیر برای همه آلاینده‌ها به جز BOD منفی بدست آمد، که نشان‌دهنده عدم تطابق این مدل با فرآیند جذب است. در نهایت، با استفاده از اکسیداسیون شیمیایی UV/H2O2 پس از جذب سطحی با Fe3O4، راندمان حذف COD به بالای 90 درصد افزایش یافت. این مطالعه نشان داد که جذب سطحی به تنهایی برای دستیابی به استانداردهای تخلیه فاضلاب کافی نیست، اما ترکیب آن با اکسیداسیون شیمیایی می‌تواند این امر را امکان‌پذیر سازد.
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