کارایی راکتورهای کرمی در کاهش حجم لجن تولیدی در سیستم‌های لجن فعال

نوع مقاله : مقالات مروری

نویسندگان

1 دانش آموخته کارشناسی ارشد مهندسی بهداشت محیط، دانشگاه علوم پزشکی تهران، تهران

2 استاد گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی ایران، تهران

چکیده

از فرایند لجن فعال برای تصفیه بیولوژیکی فاضلاب‌های شهری و پساب‌های صنعتیبه‌طور گسترده‌ای در جهان استفاده می‌شود. یکی از مشکلات این فرایند، تولید بیش از اندازه لجن است. با توجه به قوانین سخت‌گیرانه محیطی در مورد دفع لجن مازاد، هزینه تصفیه و دفع لجن حدود 60 درصد از هزینه‌های بهره‌برداری تصفیه‌خانه‌ها را شامل می‌شود. از این رو طی سال‌های اخیر کمینه‌سازی تولید لجن در تصفیه بیولوژیکی فاضلاب مورد توجه قرار گرفته است. روش‌های متعدد فیزیکی، شیمیایی و مکانیکی برای بهبود کاهش لجن ارائه شده است. این روش‌ها در اغلب موارد نیاز به سرمایه‌گذاری بالا و هزینه‌های بالای بهره‌برداری دارند. فناوری استفاده از راکتورهای کرمی بسیاری از محدودیت‌های این روش‌ها را ندارد. در این مقاله ویژگی‌های این روش و پژوهش‌های انجام شده در این زمینه به‌صورت مروری مورد توجه قرار گرفت.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Efficiency of Worm Reactors in Reducing Sludge Volume in Activated Sludge Systems

نویسندگان [English]

  • Azam Naderi 1
  • Mehdi Farzadkia 2
1 Former Graduate Student of Environmental Health Engineering, ،Tehran University of Medical Sceinces, Tehran
2 Prof. of Enviromental Health Engineering, Faculty of Public Health, Iran University of Medical Sciences, Tehran
چکیده [English]

The activated sludge process is the most widely used on a global scale for the biological treatment of both domestic and industrial effluents. One problem associated with the process, however, is the high volume of sludge produced. Excess sludge treatment and disposal account for up to 60% of the total operating costs of urban wastewater treatment plants due to the stringent environmental regulations on excess sludge disposal. These strict requirements have encouraged a growing interest over the last few years in reducing sludge volumes produced at biological treatment plants and a number of physical, chemical, and mechanical methods have been accordingly developed for this purpose. The proposed methods are disadvantaged due to their rather high investment and operation costs. An alternative technology that avoids many of these limitations is the worm reactor. In this study, the characteristics of this technology are investigated while the related literature is reviewed to derive the optimal conditions for the operation of this process in different situations.

کلیدواژه‌ها [English]

  • Activated sludge
  • Sludge Minimization
  • Worm Reactors
  • Predation
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