بررسی کارایی فرآیند پیشرفته زیستی هوازی به روش بیوراکتور بستر متحرک(MBBR) در تصفیه فاضلاب صنایع توليد مواد شوینده
الموضوعات :سعید پورکریم 1 , فریبا استوار 2 , کامران تقوی 3
1 - 1- کارشناس مسئول سامانه‌های گندزدایی و سنجش لحظه‌ای، شرکت آب و فاضلاب استان گیلان
2 - عضو هیات علمی پژوهشکده محیط زیست جهاددانشگاهی، گیلان، ایران
3 - 3- استادیار، گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی گیلان
الکلمات المفتاحية: دترجنت, لاینر الکیل بنزن سولفونات, اکسیداسیون شبه فنتون, MBBR, فاضلاب شوینده,
ملخص المقالة :
در این مطالعه، فرآیند بیولوژیکی هوازی به روش بیوراکتور بستر محترک (MBBR) جهت تصفیه فاضلاب صنایع شوینده مورد بررسی قرار گرفت. میانگین COD و LAS در فاضلاب خام به ترتیب mg/L 10231 و mg/L 210 بود. در این مطالعه، سه غلظت مختلف LAS ( mg/L 210، 500 و 1000 ) به منظور تعیین کارایی کل سیستم در حذف COD و LAS استفاده شد. نسبت BOD5/COD پس از پیش تصفیه از 2/0 در فاضلاب خام به 45/0 افزایش یافت. در سیستم MBBR در راکتور 1 با 36 ساعت زمان ماند هیدرولیکی (HRT) بالاترین راندمان حذف به ترتیب برابر 41/93 % و 95 % برای COD و LAS بدست آمد. در راکتور 2 نیز با شرایط مشابه با HRT برابر 36 ساعت، بالاترین راندمان حذف برای COD و LAS به ترتیب برابر 20/94 % و 99/99 % حاصل شد. با تغییرات مقدار هوای تزریقی از L/min 30 به L/min 50 و سپس L/min 70، راندمان حذف در مقدار تزریق هوا به L/min 50 افزایش یافت. بررسی‌های سرعت بارگذاری بار آلی (OUR) نیز کاهش مقدار ویژه مصرف اکسیژن از حدود mg O2/gr MLSS .hr 11 در ابتدای دوره بهره برداری به حدود mg O2/gr MLSS .hr2 در انتهای دوره را نشان داد. این مطالعه نشان داد که با فرآیند MBBR می تواند استانداردهای خروجی محیط زیست برای صنایع شوینده را تامین کرده و به عنوان روشی کارآمد در تصفیه پساب صنایع شوینده بکار رود.
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