ارزیابی فرآیند ترکیبی تصفیه بیولوژیکی هوازی و جذب با نانو سیلیس: مطالعه موردی شیرابه سراوان استان گیلان
فصلنامه علمی پژوهشی بهداشت در عرصه,
دوره 13 شماره 4 (1404),
5 شهریور 2026
,
صفحه 31-41
چکیده
زمینه و اهداف: تصفیه شیرابه محل دفن پسماند بهدلیل غلظت بالای ترکیبات آلی و معدنی مقاوم، نیازمند بهکارگیری فرآیندهای ترکیبی است. پژوهش حاضر با هدف ارزیابی عملکرد سیستم ترکیبی بیولوژیکی هوازی و جذب با نانوسیلیس در تصفیه شیرابه پسماند سراوان انجام شد.
مواد و روشها: نمونههای شیرابه پس از تعیین مشخصات فیزیکوشیمیایی، به مدت ۲۵ روز در راکتور هوازی آزمایشگاهی تحت تصفیه قرار گرفتند. پساب خروجی، جهت حذف تکمیلی آلایندهها، با جاذب نانو سیلیس تماس داده شد و اثر پارامترهای عملیاتی شامل زمان تماس، pH و غلظت جاذب بر راندمان حذف آلایندهها بررسی گردید. موازین اخلاقی درانجام این پژوهش، رعایت گردید.
یافتهها: نتایج نشان داد که شیرابه خام با قابلیت تجزیهپذیری بیولوژیکی متوسط رو به بالا، مناسب برای تصفیه بیولوژیکی است. فرآیند بیولوژیکی هوازی منجر به کاهش ۷۳ درصد BOD5،۶۰ درصد COD و ۵۷ درصد TSS شد؛ اما راندمان حذف فلزات سنگین در این مرحله محدود بود. در مرحله جذب تکمیلی با نانوسیلیس، راندمان حذف BOD5، COD و TSS تحت شرایط بهینه زمان تماس ۴۵ دقیقه، pH برابر ۴ و دوز جاذب g/l ۱ به ترتیب به ۸۹، ۸۷ و ۸۷ درصد افزایش یافت. در خصوص حذف فلزات سنگین، به کارگیری نانوسیلیس در زمان تماس ۷۵ دقیقه، دوز ثابت g/l 0/4 و pH در محدوده ۷-۱۰ منجر به دستیابی به حداکثر راندمان حذف فلزات از پساب بیولوژیکی گردید.
نتیجهگیری: تکمیل فرآیند بیولوژیکی هوازی با جاذب نانو سیلیس در صورت تنظیم دقیق متغیرهای عملیاتی براساس نوع آلاینده هدف میتواند به عنوان رویکردی کارآمد و قابل توسعه برای تصفیه شیرابه با قابلیت تجزیهپذیری بیولوژیکی مناسب مورد استفاده قرار گیرد.
- شیرابه محل دفن پسماند
- بارآلی
- تصفیه بیولوژیکی هوازی
- جاذب نانوسیلیس
ارجاع به مقاله
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- چکیده مشاهده شده: 12 بار