تأثیر غلظت نانوذره و اندازه ذرات ماسه بر منحنی‌های انتقال و نگهداشت نانوذرات CMC-nZVI در محیط متخلخل اشباع

آب و خاک

مقاله 15، دوره 34، شماره 1 - شماره پیاپی 69، فروردین 1399، صفحه 195-207   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/.v34i1.82623

نویسندگان

امیر صابری نصر^{* 1}؛ محمد نخعی¹؛ محسن رضائی²؛ سید موسی حسینی³

¹دانشگاه خوارزمی تهران

²دانشگاه شیراز

³دانشگاه تهران

چکیده

فهم انتقال و نگهداشت نانوذرات آهن صفر ظرفیتی (nZVI) در محیط زیرسطحی برای طراحی سیستم‌های تصفیه و احیای در محل آب‌های زیرزمینی ضروری است. در این مطالعه از آزمایش‌های اشباع ستون ماسه برای بررسی اثرات همزمان غلظت نانوذره و اندازه ذرات ماسه بر میزان انتقال و نگهداشت نانوذرات آهن صفر ظرفیتی پوشش داده شده با کربوکسی متیل سلولز (CMC-nZVI) استفاده شد. بدین منظور، 12 آزمایش با ترکیبی 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 خروجی از ستون و همچنین بر روی ماسه‌ها اندازه‌گیری شد. سپس، منحنی‌های رخنه (BTCs) و پروفیل‌های نگهداشت رسم شدند. نتایج نشان می‌دهد که پدیده رایپنینگ و استرینینگ نقش مهمی را در کاهش انتقال نانوذرات با کاهش اندازه ماسه‌ها و افزایش غلظت، در مرحله تزریق نانوذره دارند. اما در مرحله فلاشینگ، (تزریق آب دیونیزه) نقش چاله حداقل انرژی ثانویه و نیروهای هیدرودینامیکی در انتقال موثرتر می‌شود و این عوامل سبب افزایش انتقال نانوذرات با کاهش اندازه ماسه در غلظت‌های بالای نانوذره (mg/l 10000 و 3000) می‌گردد. برخلاف نتایج بدست آمده از سوسپانسیون‌های با غلظت بالا، نتایج پروفیل‌های نگهداشت در غلظت‌های پایین (mg/l 200 و 10)، از تئوری فیلتراسیون کلوئید تبعیت می‌کند.

کلیدواژه‌ها

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

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