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کاربرد فناوری کرمپالایی در تصفیه زیستی فاضلاب خام شهری و بهبود ویژگیهای کیفی پساب خروجی | ||
| دانش خاک و گیاه | ||
| مقاله 5، دوره 35، شماره 4، دی 1404، صفحه 91-114 اصل مقاله (1.92 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22034/sps.2026.71221.1032 | ||
| نویسندگان | ||
| مریم عباداللهی زارع1؛ حسینعلی علیخانی* 1؛ عبدالمجید لیاقت2؛ حسن اعتصامی1؛ شایان شریعتی فیض آبادی3 | ||
| 1گروه علوم و مهندسی خاک، دانشکدگان کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران. | ||
| 2گروه مهندسی آبیاری و آبادانی، دانشکدگان کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران. | ||
| 3گروه مهندسی محیط زیست، دانشکده محیط زیست، دانشگاه تهران، تهران، ایران. | ||
| چکیده | ||
| هدف از این پژوهش، بررسی تصفیه فاضلاب خام شهری با استفاده از فناوری ورمیفیلتر با استفاده از کرمهای خاکی Eisenia fetida بود. تیمارها شامل سامانه تصفیه فاضلاب ناپیوسته (در دو حالت 6 ساعت و 12 ساعت) و پیوسته در یک دوره 2 ماهه بود. نتایج نشان داد که pH، مواد جامد محلول (TDS)، مواد جامد معلق (TSS)، میزان اکسیژنخواهی زیستی (BOD)، میزان اکسیژنخواهی شیمیایی (COD)، با فاضلاب تصفیه نشده (شاهد) تفاوت معناداری داشتند. بیشترین کاهش مقدار BOD بهترتیب در سامانه ناپیوسته 12 ساعته (0/96 درصد) و پیوسته (2/95 درصد) مشاهده شد. بیشترین کاهش مقدار COD بهترتیب در سامانه پیوسته (6/82 درصد) و ناپیوسته 12ساعته (6/82 درصد) بود. بهترین عملکرد در کاهش TSS (5/42 درصد) در سامانه پیوسته بود. میزان pH پسآب تصفیه شده در سامانه پیوسته از 92/7 به 44/7 و در سامانه ناپیوسته 12 ساعته از 07/8 به 79/7 کاهش یافت. مقدار قابلیت هدایت الکتریکی (EC) پسآب خروجی از سامانهها بیشتر از فاضلاب تصفیه نشده (11/1 دسیزیمنس بر متر) بود. بیشترین EC پسآب خروجی در سامانه ناپیوسته 6 ساعته 80/1 دسیزیمنس بر متر بود. جمعیت کل باکتریها و کلیفرمهای کل در پسآب تصفیه شده کمتر از فاضلاب تصفیه نشده بود. جمعیت کلیفرم پسآب تصفیه شده در سامانه تصفیه پیوسته 93/98 درصد، در سامانه تصفیه ناپیوسته 12 ساعته، 95/93 درصد و در سامانه تصفیه ناپیوسته 6 ساعته، 5/63 درصد کمتر از فاضلاب خام اولیه بود. بیشترین کاهش جمعیت کلیفرمهای کل در سامانه پیوسته بود. بنابراین، میتوان بیان کرد که سامانه پیوسته و ناپیوسته 12 ساعته عملکرد بهتری در فرایند تصفیه داشتند. نتایج نشاندهنده عملکرد متفاوت سامانههای تصفیه در کاهش بار میکروبی و برتری سامانه تصفیه پیوسته در حذف کلیفرمها بود. مقایسه نتایج با استانداردهای بینالمللی نشان داد که همه ویژگیها به غیر از EC و کلیفرمها (در سامانه ناپیوسته) در محدوده مجاز برای آبیاری بود. در فرایند تصفیه فاضلاب خام، ابتدا سامانه تصفیه پیوسته بهتر عمل کرده است سپس در بین سامانههای ناپیوسته، سامانه ناپیوسته با زمان ماند 12 ساعت بهترین عملکرد را داشت. بر این اساس، فرایند ورمیفیلتراسیون میتواند بهعنوان یک راهکار مؤثر در تصفیه فاضلاب خام شهری پیشنهاد شود. | ||
| کلیدواژهها | ||
| استفاده مجدد آب؛ ایزینیا فتیدا؛ بحران آب؛ زیستپالایی؛ ورمیفیلتراسیون؛ مواد جامد معلق | ||
| مراجع | ||
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