برآورد کمی و کیفی پساب خاکستری (مطالعه موردی: مجموعه خوابگاهی دانشگاه اصفهان)

نوع مقاله : مقاله پژوهشی

نویسندگان

استادیار گروه مهندسی عمران، دانشکده مهندسی عمران و حمل و نقل دانشگاه اصفهان، اصفهان، ایران.

چکیده

در این پژوهش، وضعیت کمی و کیفی پساب خاکستری در خوابگاه‌های دانشگاه اصفهان با هدف استفاده مجدد از آن مورد بررسی قرارگرفت. بدین منظور، مصرف آب غیرشرب (استحمام و شستشوی لباس) به تفکیک خوابگاه برادران و خواهران، طی روزهای هفته و کیفیت پساب در طول ترم تحصیلی (مهر-آبان و اردیبهشت-خرداد) با نمونه‌برداری از منهول خروجی حمام‌ها پایش شد. نتایج نشان داد که سرانه متوسط مصرف آب غیرشرب و تولید پساب خاکستری دانشجویان 111 لیتر به ازای هر نفر در روز است که با احتساب 4400 نفر ساکن در خوابگاه‌ها، پساب تولیدی می‌تواند حداقل 10% نیاز آبی فضای سبز دانشگاه را تامین کند. هم‎چنین مشخص شد سرانه تولید پساب خاکستری دختران 20% بیشتر از پسران بوده و این اختلاف قابل‎ملاحظه است. به‎علاوه، سرانه تولید پساب خاکستری در آخر هفته (پنجشنبه و جمعه) به‎صورت قابل‌ملاحظه‌ای (16%) بیشتر از سایر روزها است. بر این اساس، ضرایب حداکثر روزانه و ساعتی تولید پساب خاکستری به‎ترتیب 16/1 و 25/1 برآورد شد. آنالیز کیفی پساب خاکستری نیز نشان داد که غلظت متوسط آلاینده‌های BOD، COD و TSS در این پساب به‎ترتیب برابر 65، 142 و 52 میلی‌گرم بر لیتر است که میزان تجزیه‌پذیری بیولوژیکی و ذرات معلق نسبتاً کمی دارد.

کلیدواژه‌ها


 
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