بررسی اثر غلظت سورفکتانت بر اصلاح زئولیت در حذف نیترات و شبیه‌سازی آن با مدل‌های سینتیکی و ANFIS در ستون با بستر ثابت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دکترای آبیاری و زهکشی، گروه مهندسی آب، دانشکده مهندسی زراعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران

2 دانشیار گروه مهندسی آب، دانشکده مهندسی زراعی. دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران

3 استاد، گروه خاکشناسی دانشکده علوم زراعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران

چکیده

حذف نیترات به‌منظور استفاده مجدد از زهاب کشاورزی، کنترل تغذیه‌گرایی و کاهش اثرات محیط‌زیستی، اهمیت زیادی دارد. برای این منظور اثر اصلاح زئولیت با غلظت‌های سورفکتانت (HDTMABr) به مقدار 0، 10، 15، 20 و 25 میلی‌گرم در لیتر با ستون‌هایی با ارتفاع 30 سانتی‌متر و قطر 32 میلی‌متر مورد آزمایش قرار گرفت. به‌منظور مدل‌سازی منحنی شکست ستون جذب نیز مدل‌های سینتیکی بوهارت-آدامز، توماس و دز-پاسخ اصلاح شده به‌علاوه مدل هوش مصنوعی ANFIS مورد ارزیابی قرار گرفتند. نتایج نشان داد با افزایش ظرفیت جذب تعادلی از 07/0 به 74/0 میلی‌گرم در گرم، زمان شکست و اشباع نیز افزایش می‌یابند. اصلاح زئولیت طبیعی با غلظت 25 میلی‌گرم در لیتر سورفکتانت، به‌عنوان بهترین سطح غلظت سورفکتانت انتخاب شد. در بین مدل‌های جذب، مدل توماس و مدل دز-پاسخ اصلاح شده قادر به پیش‌بینی ضرایب دینامیکی جذب بودند ولی مدل دز-پاسخ اصلاح شده، کارایی و دقت بالاتری نشان داد. نتایج پژوهش حاکی از آن است که افزایش غلظت سورفکتانت، منجر به افزایش ظرفیت جذب تعادلی می‌شود. سیستم استنتاج عصبی-فازی تطبیقی با میانگین خطای نسبی 3/23 درصد، جذر میانگین مربعات و خی دو 9/3 و 2/7، کارایی بالاتری نسبت به مدل دز-پاسخ اصلاح شده و در مجموع نسبت به مدل‌های ریاضی جذب از خود نشان داد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of Surfactant Concentration on Zeolite Modification for Nitrate Removal and Its Simulation with Kinetics Models and ANFIS in Fixed-Bed Column

نویسندگان [English]

  • Jamal Abbas Palangi 1
  • Mohammad Ali Gholami Sefidkouhi 2
  • Mohamad ali Bahmanyar 3
1 PhD of Irrigation and Drainage, Department of Water Engineering, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
2 Assoc. Prof., Department of Water Engineering, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
3 Prof., Soil Science Department, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
چکیده [English]

Nitrate removal is important for reuse of agricultural drainage, controlling nutrition and reducing its environmental impacts. For this purpose, the effect of zeolite modification with concentrations of 0, 10, 15, 20 and 25 mg/L of HDTMABr surfactant, in columns with height of 30 cm and 32 mm diameter were investigated. In order to modelling the breakthrough curve of adsorption column, three models of Bohart-Adams, Thomas and modified dose-response plus Artificial intelligence model of ANFIS were evaluated. The results showed that when the equilibrium adsorption capacity is increased from 0.07 to 0.74 mg/g, the breakthrough and exhausting times are also increased. Modification of natural zeolite with a concentration of 25 mg/L of surfactant, was selected as the best surfactant concentration. Among the adsorption models, Thomas model and the modified dose-response model were able to predict the dynamic absorption coefficients, but the modified dose-response model, was more efficient and more accurate. The results of the study showed that Increasing the concentration of surfactant leads to an increase in the equilibrium adsorption capacity. ANFIS with average relative error of 23.3%, root mean square and chi-square of 3.9 and 7.2 mg/L, had a higher efficiency than the modified response dose model, and in total has been shown higher performance to mathematical adsorption models.

کلیدواژه‌ها [English]

  • Adsorption Capacity
  • Artificial Intelligence
  • Adsorption Model
  • Cationic Modifier
  • Modified Zeolite

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مجله آب و فاضلاب
دوره 30، شماره 3 - شماره پیاپی 121
مرداد و شهریور 1398
صفحه 73-86

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