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امیر صابری نصر محمد نخعی محسن رضائی سیدموسی حسینی

چکیده

فهم انتقال و نگهداشت نانوذرات آهن صفر ظرفیتی (nZVI) در محيط زيرسطحي براي طراحي سيستم‌هاي تصفيه و احياي در محل آب‌هاي زيرزميني ضروري است. در اين مطالعه از آزمايش‌های اشباع ستون ماسه براي بررسي اثرات همزمان غلظت نانوذره و اندازه ذرات ماسه بر ميزان انتقال و نگهداشت نانوذرات آهن صفر ظرفیتی پوشش داده شده با کربوکسی متیل سلولز (CMC-nZVI) استفاده شد. بدين منظور، 12 آزمايش با ترکيبي از 4 غلظت متفاوت نانوذره (mg/l 10000، 3000، 200، 10C0= ) و سه اندازه ماسه (mm 2-1، 1-5/0، 5/0-35/0 d=) صورت گرفت. غلظت نانوذره آهن در محلول خروجي از ستون و همچنين بر روي ماسه‌ها اندازه‌گيري شد. سپس، منحني‌هاي رخنه (BTCs) و پروفيل‌هاي نگهداشت رسم شدند. نتايج نشان مي‌دهد که پديده رايپنينگ و استرينينگ نقش مهمي را در کاهش انتقال نانوذرات با کاهش اندازه ماسه‌ها و افزايش غلظت، در مرحله تزريق نانوذره دارند. اما در مرحله فلاشينگ، (تزريق آب ديونيزه) نقش چاله حداقل انرژي ثانويه و نيروهاي هيدروديناميکي در انتقال موثرتر مي‌شود و اين عوامل سبب افزايش انتقال نانوذرات با کاهش اندازه ماسه در غلظت‌هاي بالاي نانوذره (mg/l 10000 و 3000) مي‌گردد. برخلاف نتایج بدست آمده از سوسپانسیون‌های با غلظت بالا، نتايج پروفيل‌هاي نگهداشت در غلظت‌هاي پايين (mg/l 200 و 10)، از تئوري فيلتراسيون کلوئيد تبعيت مي‌کند.

جزئیات مقاله

کلمات کلیدی

انتقال, اندازه ذرات ماسه, غلظت نانوذره, نانوذرات CMC-nZVI, نگهداشت

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ارجاع به مقاله
صابری نصرا., نخعیم., رضائیم., & حسینیس. (2020). تأثير غلظت نانوذره و اندازه ذرات ماسه بر منحني‌هاي انتقال و نگهداشت نانوذرات CMC-nZVI در محیط متخلخل اشباع. آب و خاک, 34(1), 195-207. https://doi.org/10.22067/.v34i1.82623
نوع مقاله
علمی - پژوهشی