تصفیه فاضلاب آشپزخانه با روش بستر لجن بی هوازی جریان رو به بالا (UASB)

نوع مقاله : مقاله پژوهشی

نویسنده

استادیار، گروه مهندسی شیمی، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرمان، ایران

چکیده

رستوران­ها و آشپزخانه­ها روزانه حجم زیادی فاضلاب تولید و در محیط‌زیست رها می­کنند. سیستم بستر لجن بی‌هوازی جریان رو به بالا (UASB) با توجه به مزایا، می­تواند درزمینه تصفیه این نوع فاضلاب مؤثر واقع شود. در این روش لجن­های گرانوله شده، مولکول­های بزرگ روغن، چربی و دترجنت­ها موجود در فاضلاب را در شرایط بی­هوازی به بیوگاز تبدیل می­کنند. بنابراین عملکرد سیستم UASB در حذف COD و چربی فاضلاب رستوران با مقدار COD و چربی به­ترتیب 1925 و mg/l 225، مورد بررسی قرار گرفت. نتایج نشان داد که سیستم تصفیه فاضلاب UASB قادر بود 5/79% COD فاضلاب را در دمای C25° و زمان‌ماند هیدرولیکی hr 9 حذف نماید. به­علاوه، اثر دما و زمان هیدرولیکی بر عملکرد سیستم UASB نیز بررسی شد. با افزایش دما درصد حذف COD ابتدا افزایش و سپس کاهش پیدا کرد. طوری­که در دمای C40°، 84% COD فاضلاب حذف شد. همچنین با افزایش زمان‌ماند هیدرولیکی تا day 1، بیش­ترین درصد حذف COD، 5/92 % در دمای C40° به­دست آمد که شرایط بهینه تصفیه این نوع فاضلاب با سیستم UASB بود. همچنین در این شرایط، 5/96 و90% به­ترتیب چربی و نیترات فاضلاب نیز حذف شد. به­علاوه عملکرد سیستم تصفیه هوازی لجن فعال برای تصفیه این نوع فاضلاب بررسی شد و نتایج حذف حداکثر 5/53% از COD فاضلاب را نشان داد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Treatment of Kitchen Wastewater Using Upflow Anaerobic Sludge Blanket (UASB)

نویسنده [English]

  • Mahmoud Rahmati
Assist. Professor, Department of Chemical Engineering, Graduate University of Advanced Technology, Kerman, Iran
چکیده [English]

Restaurants and kitchens release large amounts of wastewater into the environment on a daily basis. Upstream anaerobic sludge bed system (UASB) can be effective in the treatment of this type of wastewater due to its advantages. In this method, granulated sludge, large molecules of oil, fat and detergents in wastewater are converted to biogas under anaerobic conditions. Therefore, the performance of the UASB in removing of COD and fat from wastewater of restaurant was investigated with 1925 and 225 mg/lit, respectively, COD and fat was investigated. The results show that the UASB wastewater treatment system is able to remove 78% of wastewater COD at temperature of 25 ℃ and a hydraulic residence time of nine hours. In addition, the effect of temperature and hydraulic residence time on the performance of the UASB system was investigated. The results show that with increasing temperature, the percentage of COD removal first increases and then decreases, so that at 40 ℃, 84% of COD wastewater is removed. Also, by increasing the hydraulic retention time to one day, the highest percentage of COD removal, i.e., 92.5%, was obtained at 40 ℃. The optimal treatment conditions for this type of wastewater in the UASB system, are this condition, and also the UASB system can be removed fat and nitrate 96.5 and 90%, respectively. In addition, the performance of the activated sludge aerobic treatment system was investigated and the results show the maximum removal of COD is 53.5%.

کلیدواژه‌ها [English]

  • Anaerobic Sludge Bed
  • Biological Treatment
  • Granulated Sludge
  • Kitchen Sludge
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