بهینه سازی حذف فسفات از زه آب های کشاورزی با استفاده از هیدروچار فعال شده باگاس نیشکر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 محقق پسا دکتری-دانشکده مهندسی علوم آب- دانشگاه شهید چمران اهواز

2 استاد آبیاری و زهکشی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز

چکیده

تصفیه آب‌های آلوده با استفاده از بقایای کشاورزی یکی از راهکارهای مهم بهبود آلودگی محیط زیست است و علاوه بر آن، مدیریت مؤثر زباله‌های جامد آلی را به‌دنبال خواهد داشت. هدف از انجام این تحقیق حذف فسفات از زه‌آب‌های کشاورزی به روش جذب سطحی و بهینه سازی پارامتر‌های موثر بر جذب می‌باشد. پس از تهیه هیدروچار فعال شده باگاس نیشکر، خصوصیات مختلف آن به عنوان یک جاذب جدید با استفاده از دستگاه‌های میکروسکوپ الکترونی روبشی، طیف سنجی مادون قرمز تبدیل فوریه، فلوئورسانس اشعه ایکس، آنالیز عنصری تعیین گردید. سپس بهینه‌سازی پارامتر‌های موثر بر جذب با بررسی اثر پارامتر‌های اسیدیته محلول، مقدار جاذب، دمای محلول، وجود یون‌های رقیب و زمان تماس بر فرایند جذب فسفات انجام گردید. نتایج آزمایشگاهی به دست آمده با مدل‌های مختلف سینتیک (لاگرگرن، هو و همکاران و اورامی) و ایزوترم (فروندلیچ، لانگمویر و ردلیچ- پترسون) شبیه‌سازی شدند. نتایج نشان داد که اسیدیته بهینه جذب فسفات توسط جاذب مورد مطالعه برابر 6، مقدار بهینه جاذب برابر 1 گرم بر لیتر، زمان تماس بهینه برابر 180 دقیقه می‌باشد. افزایش دما موجب افزایش میزان حذف فسفات گردید و از میان آنیون‌های رقیب، سولفات بیشترین تأثیر و کربنات کمترین تأثیر را بر حذف فسفات داشتند. حداکثر میزان جذب فسفات در شرایط بهینه توسط هیدروچار فعال شده باگاس نیشکر (69/54 میلی‌گرم بر گرم) بود. از بین مدل‌های سینتیک و ایزوترم، مدل سینتیک هو و همکاران و ایزوترم لانگمویر قادر به شبیه‌سازی بهتری از داده‌های آزمایشگاهی بودند.

کلیدواژه‌ها

عنوان مقاله [English]

Optimizing the removal of phosphate from agricultural drains water using activated sugarcane bagasse hydrocar

نویسندگان [English]

  • Laleh Divband Hafshejani 1
  • Abdali Naseri 2
1 Researcher. Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz- Iran National Science Foundation.
2 Professor of Irrigation and Drainage, Faculty of Water Engineering, Shahid Chamran University of Ahvaz
چکیده [English]

Treatment of Polluted wastewater is one of the most important ways to improve environmental pollution and in addition, it will lead to the effective management of organic solid waste. The aim of this study is to remove phosphate from agricultural wastewater by adsorption method and optimizing the parameters that affect adsorption. After preparing the activated sugarcane bagasse hydrocar, its various characteristics as a new adsorbent were determined using SEM, FTIR, XRF, and CHNSO. Then, the optimization of the adsorption parameters was done by examining the effect of changing the parameters of pH, adsorbent dosage, temperature, competing ions, and contact time on the phosphate adsorption process. Laboratory data were simulated with different kinetic models (Lagergren, Ho et al and Avrami) and isotherms (Langmuir, Freundlich, and Redlich- Peterson). The results showed that the optimal pH for the absorption of phosphate was 6, the optimal adsorbent value was 1 g/L, and the best contact time was 180 min. The increasing temperature increased the amount of removed phosphate and among the competing anions, sulphate had the greatest effect, and carbonate had the least effect on phosphate removal. The maximum adsorption capacity of phosphate under optimal conditions by activated sugarcane bagasse hydrocar was (54.69 mg/g). Among the kinetic and isotherm models, Ho et al and Langmuir model simulated laboratory data very well.

کلیدواژه‌ها [English]

  • Adsorption
  • Kinetic
  • Isotherms
  • Thermodynamic

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نشریه آبیاری و زهکشی ایران
دوره 14، شماره 5 - شماره پیاپی 83
آذر و دی 1399
صفحه 1853-1865

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