نشریه محیط زیست طبیعی

حذف نیترات از آب و پساب توسط گیاهان آبزی (Myriophyllum spicatum) و (Ruppia maritima)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه آزاد اسلامی، واحد اصفهان (خوراسگان)

2 دانشگاه آزاد اسلامی، واحد اصفهان(خوراسگان)

3 دانشگاه ازاد اسلامی اصفهان

چکیده

روش‌‌های متعددی برای حذف نیترات وجود دارد که اغلب بسیار هزینه‌‌بر هستند. استفاده از گیاهان آبزی به دلیل هزینه کم و سازگاری با محیط زیست، سال‌‌هاست که توجه محققان را به خود جلب نموده است. به منظور استفاده از دو نوع گیاه Myriophyllum spicatum و Ruppia maritima در حذف نیترات، آزمایشی در سه تیمار و سه تکرار با جریان بسته در آکواریوم طراحی شد. نیازهای زیستی لازم برای رشد گیاهان مورد مطالعه در آکواریوم فراهم شد. زمان ماند، یک ماه در نظر گرفته شد و تغییرات نیترات هر سه روز یکبار و در کل، 10 بار توسط دستگاه اسپکتروفتومتر مدل Unic 2100 ثبت گردید. در کلیه تیمارها به جز دوره زمانی 6، تفاوت معنی دار در میزان جذب نیترات بین گیاهان مورد مطالعه وجود دارد. در پایان روز 30، شاخص درصد حذف M. spicatum، 13/87 و R.maritima، 53/92 بدست آمد. وزن خشک R.maritima در پایان آزمایش افزایش معنی دار داشته که نشان دهنده قابلیت آن در استفاده از نیترات به عنوان ماده مغذی می‌باشد. تفاوت معنی دار میانگین نیترات در نمونه ها با نمونه شاهد طی دوره های زمانی مختلف، بیانگر وجود عاملی به جز تجزیه باکتریایی یعنی حضور گیاهان در این مطالعه است. بر اساس نتایج، این ماکروفیت ها به عنوان یک گزینه مناسب برای کاهش بار نیترات و مواد آلی در آب های آلوده هستند. لازم به ذکر است که لازمه بهبود کیفیت آب و نگهداری از سطح کیفی بدست آمده، کنترل این ماکروفیت ها است تا از بازگشت مواد مغذی موجود در بافت آنها به محیط طی فرآیند تجزیه جلوگیری به عمل آید.

کلیدواژه‌ها

عنوان مقاله [English]

Nitrate Removal from Water and Wastewater by Myriophyllum spicatum and Ruppia maritima

نویسندگان [English]

  • Morteza Dorri 1
  • Atefeh Chamani 2
  • Mohsen Nourouzi 3

1 Environmental sciences Department, Islamic Azad University, Isfahan (Khorasgan) Branch, Isfahan, Iran.

2 Environmental sciences Department, Islamic Azad University, Isfahan (Khorasgan) Branch, Isfahan, Iran.

3 Environmental sciences Department, Islamic Azad University, Isfahan (Khorasgan) Branch, Isfahan, Iran.

چکیده [English]

There are several methods for nitrate removal that are often very costly. The use of aquatic plants due to its low cost and environmental compatibility has attracted the attention of researchers for many years. To use two species of Myriophyllum spicatum and Ruppia maritima in nitrate removal, an experiment was conducted in three treatments and three replications with closed flow. After 2 months of in vitro test, a 30-day retention time was considered for the study. The results showed that there was a significant difference in nitrate uptake in all treatments except period 6. After 30 days, the uptake index of Myriophyllum spicatum was 87.13 and Ruppia maritima was 92.53. Dry weight of Ruppia maritima was significantly increased at the end of experiment, while it was not significant for Myriophyllum spicatum. The significant difference between the mean nitrate in the samples and the control sample during different time indicates the existence of a factor other than bacterial decomposition, which is the presence of plants in this study. Based on the results, these macrophytes are a suitable option to reduce the load of nitrates and organic matter in contaminated water. It should be noted that the need to improve water quality and maintain the quality level is to control these macrophytes to prevent the return of nutrients in their tissue to the environment during the decomposition process.

کلیدواژه‌ها [English]

  • Agricultural wastewater
  • Aquatic Plants
  • Myriophyllum spicatum
  • Nitrate
  • Ruppia maritima
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نشریه محیط زیست طبیعی
دوره 73، شماره 4
اسفند 1399
صفحه 677-686