بررسی عملکرد گیاه وتیور در حذف مواد مغذی از فاضلاب

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار، عضو هیئت علمی مؤسسه تحقیقات آب، مرکز تحقیقات آب و فاضلاب، تهران

2 دانش‌آموخته کارشناسی ارشد مهندسی محیط زیست، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات بوشهر

3 دانشجوی دکترا، کارشناس پژوهشی مؤسسه تحقیقات آب، مرکز تحقیقات آب و فاضلاب، تهران

4 کارشناس پژوهشی مؤسسه تحقیقات آب، مرکز تحقیقات آب و فاضلاب، تهران

چکیده

هدف از این پژوهش، امکان‌سنجی رشد گونه گیاهی وتیور به‌صورت هیدروپونیک در محیط پساب و ارزیابی میزان حذف و پالایش ترکیبات مغذی (نیتروژن و فسفر) در این شرایط بود. به این منظور، پایلوتی با حجم مفید 60 لیتر ساخته شد و به‌مدت سه ماه به‌طور هفتگی و ناپیوسته از پساب خروجی تصفیه‌خانه فاضلاب شهرک غرب تهران تغذیه شد. نتایج حاصل نشان داد که گیاه وتیور می‌تواند در این شرایط، رشد قابل ملاحظه‌ای (تا 130 سانتی‌متر) داشته باشد. همچنین به‌طور متوسط کارآمدی حذف ترکیبات نیتروژن کل، فسفر کل و میزان اکسیژن‌خواهی بیوشیمیایی در زمان ماند 4 روزه به‌ترتیب 91، 97 و 75 درصد بود. در صورت استفاده از وتیور به‌عنوان واحد تصفیه تکمیلی، زمان ماند باید حداقل 48 ساعت باشد زیرا ترکیبات آمونیوم، نیتریت و فسفات که عوامل محدودکننده استانداردهای تخلیه پساب و استفاده مجدد از آنها هستند، در این مدت با کارایی بیش از 95 درصد حذف می‌شوند. در این دوره مطالعاتی، میزان جذب نیتروژن و فسفر کل در برگ‌ها به‌ترتیب 17 و 3/2 میلی‌گرم در گرم وزن خشک و در ریشه‌های گیاه به‌ترتیب 13 و 8/1 میلی‌گرم در گرم وزن خشک بود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of the Performance of Vetiveria zizanioides in Removing Nutrients from Wastewater

نویسندگان [English]

  • Abbas Akbarzadeh 1
  • Maryam Vakhshouri 2
  • Shervin Jamshidi 3
  • Morteza Khalesidoost 4
3 PhD Student and Researcher at Water Research Institute, Water and Wastewater Research Center, Tehran
4 . Research Staff Member, Water Research Institute, Water and Wastewater Research Center, Tehran
چکیده [English]

The aim of this study was to evaluate the growth of Vetiveria zizanioides under hydroponic conditions and its efficiency in removing nitrogen and phosphorus compounds from wastewaters. For this purpose, a pilot plant was constructed with a net volume of 60 liters which was intermittently fed for three months with the effluent from a domestic wastewater treatment plant. It was found that Vetiver exhibited a significant capability for living in polluted waters under hydroponic condition as evidenced by the growth of its leaves to 130 cm. Moreover, the average values of total nitrogen, total phosphorus, and biochemical oxidation demand (BOD) removal efficiencies over four days of retention time were 91%, 97%, and 75%, respectively. If used as a tertiary treatment unit, the plant needs a minimum retention time of two days to allow adequate time for the removal of such vital compounds as Ammonia and Phosphate by 95%, which is the typical standard limit for wastewater reuse or free discharge. Finally, it was observed that the total values of nitrogen and phosphorus absorbed in the leaves were 17 and 2.3 (mg/gr dry weight) while the same elements absorbed in the roots were measured as 13 and 1.8 (mg/gr dry weight), respectively.

کلیدواژه‌ها [English]

  • Phytoremediation
  • Wastewater
  • Vetiver Grass
  • nutrients

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