بررسی اثر استفاده از زئولیت طبیعی کلینوپتیلولیت اصلاح شده در حذف نیترات، فسفات و شوری از زهاب کشاورزی در مدل زهکشی آزمایشگاهی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا آبیاری و زهکشی دانشکده مهندسی آب و محیط‌زیست دانشگاه شهید چمران اهواز، اهواز، ایران.

2 دانشیار دانشکده مهندسی آب و محیط‌زیست دانشگاه شهید چمران اهواز، اهواز، ایران،

3 دانشیار دانشکده مهندسی آب و محیط‌زیست دانشگاه شهید چمران اهواز، اهواز، ایران.

4 استاد دانشکده مهندسی آب و محیط‌زیست دانشگاه شهید چمران اهواز، اهواز، ایران.

چکیده

در این مطالعه با هدف بررسی استفاده از زئولیت کلینوپتیلولیت به‌عنوان جاذب در حذف آلاینده‌های نیترات، فسفات و شوری از زهاب کشاورزی، به‌منظور تعیین سطوح مناسب پارامترهای مؤثر بر جذب آلاینده‌ها، آزمایش‌ها به‌صورت ناپیوسته با لحاظ نمودن اثر پارامترهای قطر ذرات جاذب، غلظت آلاینده­ها، میزان شوری، دما، زمان ماند، pH و غلظت جاذب انجام پذیرفت و سپس، آزمایش‌های جذب توسط ساخت یک مدل زهکشی بررسی گردید. آزمایش‌های جذب در چهار مدل که شامل مدل شاهد (D0)، جاذب در اطراف زهکش (D1)، جاذب در محیط ریشه گیاه (D2) و جاذب در سطح خاک (D3) بود، به‌وسیله زهاب طبیعی خروجی از زهکش‌های مزارع جنوب خوزستان، تحت شرایط مناسب پارامترهای مؤثر انجام پذیرفت. نتایج حاصل از این پژوهش حاکی از آن است که، میزان حذف آلاینده­ها و شوری در شرایطی که قطر ذرات جاذب برابر 1000 میکرومتر، غلظت جاذب برابر 30 گرم بر لیتر، pH برابر پنج، غلظت آلاینده‌های ورودی دارای مقادیر ، 80 میلی‌گرم بر لیتر نیترات، 10 میلی‌گرم بر لیتر فسفات و شوری 12 دسی‌زیمنس بر متر، زمان ماند برابر 90 دقیقه و دمای محیط برابر 50 درجه سانتی‌گراد درنظر گرفته شود، بازدهی حذف نیترات، فسفات و شوری به‌ترتیب برابر 63، 39 و 79 درصد خواهد شد. با استفاده از این سطح پارامترها در مدل­های زهکشی مورد مطالعه، در حالتی که جاذب کلینوپتیلولیت در اطراف محیط زهکش قرار دارد (D1)، راندمان حذف برابر 72/59 درصد ، 28/29 درصد و 47/77 درصد به‌ترتیب در حذف نیترات، فسفات و شوری به دست آمد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Using Modified Natural Zeolite Clinoptilolite to Remove Nitrate, Phosphate and Salt from Agricultural Drainage Water in a Drainage System Model

نویسندگان [English]

  • Sara Sadeghi 1
  • Mohammad Albaji 2
  • Mona Golabi 3
  • Saeed BoroomandNasab 4
1 PhD student in Irrigation and Drainage, Faculty of Water and Environment Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
2 Associate Professor and Faculty Member of the Faculty of Water and Environment Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
3 Associate Assistant Professor and Faculty Member of the Faculty of Water and Environment Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
4 Professor and Faculty Member of the Faculty of Water and Environment Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
چکیده [English]

This study examined the feasibility of using zeolite clinoptilolite to filter nitrate, phosphate pollutants and salt from the agricultural drainage water. To that end, significant pollutant absorption parameters, such as adsorbent particle size, pollutant concentration, salinity, temperature, retention time, pH, and adsorbent concentration were optimized in the batch condition. Having optimized the parameters, the researchers conducted adsorption experiments on an experimental model, similar to the subsurface drainage systems applied in farms. Adsorption experiments were carried out at the optimized parameter levels on four models, namely a reference model (D0), a model with adsorbents around the drains (D1), a model with adsorbents around the plant roots (D2), and a model with adsorbents on the soil surface (D3). These models were fed with untreated drainage water from the farms in the south of Khuzestan during the fertilization season. The results showed 63 percent nitrate removal efficiency, 39 percent phosphate removal efficiency and 79 percent salt removal efficiency by using 30 g.L-1 of 1000 µm adsorbent particles for a pH of 5, initial pollutant concentration of 80 mg.L-1 nitrate and 10 mg.L-1 phosphate in 12 dS/m salinity during a 90-minute retention time period at 50 °C ambient temperature. These parameter levels led to nitrate, phosphate, and salt removal efficiencies of 59.72 percent, 29.28 percent, and 77.47 percent respectively, in the model with clinoptilolite adsorbents around the drains (D1).

کلیدواژه‌ها [English]

  • adsorption
  • Removal Efficiency
  • Phragmites australis
  • Farms of Khuzestan
  • Natural adsorbent
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