نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری آبیاری و زهکشی، دانشگاه شهید چمران اهواز.

2 دانشگاه شهید چمران اهواز

3 دانشگاه شهید چمران

4 استادیار گروه آبیاری و زهکشی، پردیس ابوریحان دانشگاه تهران

5 رییس دانشکده علوم آب دانشگاه شهید چمران اهواز

چکیده

یکی از اجزای پایدار نیتروژن، در طبیعت نیترات می­باشد. ترکیبات نیترات بسیار حلال بوده و به راحتی می­توانند وارد آب­های سطحی و زیرزمینی شده و باعث آلوده شدن آن­ها گردند. دنیتریفیکاسیون یکی از راه­های حذف دائمی نیترات از
اکوسیستم­های آبی و زمینی می­باشد. در این تحقیق پدیده دنیتریفیکاسیون و روند تغییر نرخ حذف نیترات با زمان، در یک مطالعه آزمایشگاهی ستونی بر روی دو نوع بستر متفاوت، نوع اول، فاقد باگاس نیشکر و نوع دوم، حاوی 30 درصد حجمی باگاس نیشکر و 70 درصد خاک، تحت شرایط کاملا اشباع (بی هوازی)، بررسی و مطالعه شد. غلظت نیترات ورودی به بسترهای مورد مطالعه، به طور متوسط 45 میلی گرم در لیتر در نظر گرفته شد. با نمونه برداری از محلول ورودی و خروجی از فیلترهای طراحی شده، تغییرات حذف نیترات طی یک دوره سه ماهه مورد بررسی و ارزیابی قرار گرفت. بیشترین درصد حذف نیترات در بسترهای حاوی باگاس  (94 درصد) در اواخر دوره و در بسترهای فاقد باگاس (89 درصد)، در اوایل دوره مشاهده شد. نتایج نشان دادند که باگاس نیشکر می­تواند به عنوان یک منبع کربنی بسیار مفید و کارآمد در طراحی فیلترهای کربنی و دیواره­های دنیتریفیکاسیون کربنی برای حذف مطلوب نیترات از محلول­های ورودی استفاده شود. به طور کلی، نتایج این تحقیق، فرآیند دنیتریفیکاسیون را به عنوان یکی از مکانسیم های اصلی حذف بیولوژیکی نیترات از محیط­های بی­هوازی پیشنهاد می­دهد.

کلیدواژه‌ها

عنوان مقاله [English]

Evaluate the Performance of Sugarcane Bagasse as a Carbonic Source Required in the Design of Denitrification Substrates

نویسندگان [English]

  • Sareh Tangsir 1
  • Abed Ali Naseri 2
  • Hadi Moazed 3
  • Seyed Ebrahim Hashemi Garm Dareh 4
  • Saeed Boroomand nasab 5

چکیده [English]

     Nitaret is one of the stable components of nitrogen in the nature. Nitrate compounds are highly soluble and can easily imported to the surface and groundwaters and finally lead to be polluted of them. Denitrification is one of permanent removal methods of nitrate from terrestrial and aquatic ecosystems. In this study, denitrification process and nitrate removal rate changes with time in a column experimental study was evaluated on two types of denitrification beds, first type was a mixture of bagasse and soil (30 % of the volume of bagasse and 70 % of the volume of soil) and second type was only soil without bagasse. All experiments were performed under saturation conditions (anaerobic conditions). The influent nitrate concentraion to the all beds was considered an average of 45 mg/l. With sampling of inflow and outflow of the columns, nitrate removal changes were assessed over a period of three months. The maximum percentage of nitrate removal in columns with mixture of soil and bagasse were occurred in the end of the experiment (94%) and in columns without the bagasse were ocured in the first of the experiment (89%).The results showed that sugar cane bagasse as a carbonic source can be very useful in the design of carbonic filters and denitrification walls for nitrate favorable removal of inlet concentrated solutions. Overall, the results confirm that the denitrification process is one of the main mechanisms of biological nitrate removal from anaerobic enviroments.

کلیدواژه‌ها [English]

  • Sugarcane Bagasse
  • Denitrification bed
  • Actual hydraulic retention time
  • nitrate

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