گندزایی پساب تصفیه خانه های فاضلاب شهری توسط پرتودهی فرابنفش در حضور پروکسی مونوسولفات و هیدروژن پروکسید

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی آب، فاضلاب و محیط زیست، دانشکده مهندسی عمران، آب و محیط زیست، دانشگاه شهید بهشتی، تهران، ایران

چکیده

دراین پژوهش، کارآمدی فرآیند اکسیداسیون پیشرفته پروکسی مونوسولفات پرتو فرابنفش )قادر به تولید هردو رادیکال سولفات و -
هیدروکسیل( در مقیاس آزمایشگاهی با هدف بهینه سازی فرآیند گندزدایی پساب خروجی تصفیه خانه فاضلاب شهری به روش لجن
فعال مورد بررسی قرار گرفت و با روشهای پرسولفات پرتو فرابنفش، هیدروژن پراکسید پرتو فرابنفش و پرتودهی فرابنفش - -
مقایسه شد. فرآیند پروکسی مونوسولفات پرتو فرابنفش، تحت شرایط بهینه راهبری )مدت زمان ماند 02 دقیقه، میزان دوز پرتو -
فرابنفش 2μW/cm 024 × 2/ 0/7 و غلظت پروکسی مونوسولفات 20 mmol/L ( تعداد کلی فرم کل به کمتر از حد مجاز استاندارد
کاهش داد. از سوی دیگر دستیابی به حد مجاز کلیفرم کل با روش هیدروژن پراکسید پرتو فرابنفش تحت شرایط بهینه )زمان ماند -
02 دقیقه، میزان دوز پرتو فرابنفش 2μW/cm 024 × 2/ 0/7 و غلظت هیدروژن پراکسید 32 mmol/L ( به حد مجاز کلیفرم کل میسر
گردید. در سایر روشها، دستیابی به حد مجاز تعداد کلیفرم کل حاصل نگردید. همچنین امکان سنجی همزمان بهبود دیگر
پارامترهای کیفی پساب خروجی نیز انجام پذیرفت. به کارگیری فرآیند پروکسی مونوسولفات پرتو فرابنفش منجر به کاهش مقادیر -
BOD ، COD 30 و 44 درصد شد، اما تاثیر چندانی بر میزان غلظت فسفر و /0 ،02/ و کدورت پساب خروجی به ترتیب برابر 2
نیتروژن کل نداشت. در نهایت میتوان گفت که فرآیند پروکسی مونوسولفات پرتو فرابنفش از کارآمدی بالایی در زمینه گندزدایی و -
بهبود دیگر پارامترهای مهم کیفی پساب خروجی تصفیه خانه برخوردار است.

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