بررسی رفتار سینتیکی و تعادلی جذب مواد آلی ویناس بر کربن فعال گرانولی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده جغرافیا و علوم محیطی، دانشگاه حکیم سبزواری، سبزوار، خراسان رضوی، ایران

2 سازمان حفاظت محیط زیست، دانشکده محیط زیست، البرز، کرج، ایران

چکیده

در فرآیند تخمیر الکلی از ملاس چغندر قند به عنوان منبع کربن استفاده میگردد که بعد از این فرآیند ملاس تبدیل به ماده دورریزی به نام ویناس می گردد که ماده ای رنگی حاوی مقادیر بالایی مواد آلی می باشد. در این مطالعه رفتار سینتیکی و تعادلی جذب مواد آلی بر سطح کربن فعال گرانولی ( GAC)بررسی گردید. نتایج نشان داد که مدل فرندلیچ به میزان اندکی تطابق بهتری با روند جذب نسبت به مدل لانگمایر نشان می دهد و کمترین مقدار تطابق دادهها با مدل تمکین بود ( R2برابر 0/92). مقدار R2در مدل فرندلیچ 0/983بدست آمده و در مدل لانگمایر مقدار آن 0/976بوده است که بین این دو تغییر اندکی مشاهده می شود. مقدار qmدر مدل لانگمایر،  mg/g  71/149 بدست آمده است که با مقدار تجربی آن ( mg/g  68/1) نزدیک است. از طرفی دیگر مدل سنتیکی شبه مرتبه دوم قابلیت توصیف بالاتری (بر حسب مقادیر )R2نسبت به مدل سینتیکی شبه مرتبه اول دارد و مقادیر qe2بدست آمده به مقادیر qe. exp نزدیکتر است. نتایج نشان داد که نرخ جذب در مدل سینتیکی شبه مرتبه دوم (H )تابعی از غلظت اولیه جزء جذب شونده در محلول است که با افزایش غلظت CODاولیه میزان آن افزایش می یابد.
 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Equilibrium and Kinetic Studies of Adsorption Organic Compounds of Vinasse onto Granular Activated Carbon

نویسندگان [English]

  • M. Hadavifar 1
  • A. Sadat Delbari 2
1 Dept. of environmental engineering, Hakim Sabzevari University, Sabzevar, Iran
2 Department of Environmental, College of Environment, Alborz, Karaj, Iran
چکیده [English]

Distilleries wastewater (vinasse) because of its pollution problems is serious environmental concern. In this study the  equilibrium and kinetic studies of adsorption organic compounds of vinasse onto granular activated carbon was  investigated. In order to determine the effect of initial COD (Chemical Oxygen Demand) concentration on the adsorption  effciency, different COD concentrations with granular activated carbon (GAC) dosage of 50 g/l were tested. The COD removal trends for different concentration vinasse solution was investigated at different initial concentration, pH=2 and temperature of 25 °C. The ultimate or equilibrium concentrations were determined for all initial COD concentration.
The qe values for different COD concentrations of 1957, 3391, 5222, 6558 and 8975 mg/l were found to be 29.3, 46.2, 50.6, 58 and 68.1 mg/g, respectively. An increase in qe was obtained by increasing initial COD concentration, indicating selective nature of GAC in particular organic matters. Equilibrium qe values of fve initial COD concentrations that were ftted by isotherm models. Both Freundlich (R2= 0.983) and Langmuir (R2 = 0.976) isotherms give a good correlation for GAC adsorption of total organic maters in terms of R2 values, however it is slightly higher in Freundlich model and Temkin
model demonstrated a low ftness (R2=0.92). The maximum adsorption capacity of GAC (qm) predicted by Langmuir model was 71.14 mg/g. The empirical value of qe in our study was 68.1 mg/g with a good vicinity to predicted value by Langmuir isotherm model (71.149 mg/g).

کلیدواژه‌ها [English]

  • vinasse
  • Isotherm models
  • Adsorption kinetics
  • activated carbon
  • Organic Compounds

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نشریه مهندسی عمران امیرکبیر
دوره 50، شماره 2
خرداد و تیر 1397
صفحه 269-278

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