حذف نیترات توسط فرایند گیاه‌پالایی در مقیاس آزمایشگاهی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران

2 دانشیار دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران

3 استاد دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران

چکیده

هدف از انجام این تحقیق، پرورش سه گونه مناسب آبزی برون آ (نی، بامبو و نخل مرداب) در محیط آزمایشگاهی به‌روش هیدروپونیک و بررسی توانایی آنها در حذف نیترات از آب بود. به‌این منظور از سه گلدان با غلظتهای اولیه  NO3-/N و25و  20 و 15 میلی‌گرم در لیتر، یک گلدان حاوی کود کامل امکس و یک گلدان شاهد استفاده شد. طی 8 ماه تحقیق، تغییرات غلظت و درصد حذف نیترات و نیز میزان رشد، وزن‌تر و خشک نمونه‌های گیاهی مورد بررسی قرار گرفت. نتایج حاصل حاکی از قابلیت بیشتر گیاه نی برای حذف نیترات از آب نسبت به دو گیاه دیگر بود به گونه‌ای که در بالاترین غلظت، میانگین حذف نیترات در نی، بامبو و نخل مرداب به‌ترتیب 95، 85 و 70 درصد تعیین شد. میان وزن خشک گیاهی و راندمان حذف گونه‌ها رابطه مستقیمی وجود داشت و بیشترین میزان جذب نیترات در ریشه و ریزوم گیاه مشاهده شد.

کلیدواژه‌ها


عنوان مقاله [English]

Lab Scale Study of Nitrate Removal By Phytoremediation

نویسندگان [English]

  • fatemeh fallahi 1
  • bita ayati 2
  • hossein ganjidoust 3
1 M.Sc. Student of Civil and Env. Eng., Tarbiat Modares University, Tehran
2 Assoc. Prof. of Civil and Env. Eng., Tarbiat Modares Univ.,Tehran
3 Prof. of Civil and Env. Eng., Tarbiat Modares Univeristy, Tehran
چکیده [English]

The purpose of this study was to Cultivate three suitable emergent herbaceous species (reed (Phragmites australis), bamboo (Dracaena sanderiana), and umbrella plant (Cyperus alternifolius)) in laboratory scale using hydroponic method and to examine their potential in removing nitrate from contaminated water. Three containers with initial NO3--N concentration of 15, 20, 25 mg/L, one container of perfect omex fertilizer and the last one with plane water and soil were used in this study. The variations of nitrate concentration, its removal rate, and plant growth (dry and wet weight) were all measured during 8 months of the study. The experimental results indicated that reeds had higher ability to remove nitrate as compared to bamboo and umbrella plant. For the highest concentration, reeds, bamboo and umbrella plant absorbed about 95, 85 and 70 percent nitrate, respectively. There was a direct relation between dry weight and removal efficiency and the most amount of nitrate absorption was measured in root and rhizome of the plant.

کلیدواژه‌ها [English]

  • Nitrate
  • Phyto-Remediation
  • Emergent Herbaceous
  • Reed
  • Bamboo
  • Umbrella Plant
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