حذف نیترات از آب زیرزمینی با استفاده از ستون جاذب حاوی رزین Purolite A-400

نوع مقاله: مقاله پژوهشی

نویسندگان

دانشگاه گیلان

چکیده

طراحی مناسب و موفق یک ستون جاذب، مستلزم پیش­بینی تغییرات زمانی غلظت جریان خروجی یا همان منحنی رخنه است که با بهره­گیری از مدل­سازی فرایند جذب امکان­پذیر است. به این منظور، آزماییش­هایی­ با عبور جریان محلول­های استاندارد با غلظت 75 و 150 میلی­گرم در لیتر نیترات و آب آلوده­ی یکی از چاه­های استان گیلان از ستون جاذب حاوی رزین آنیونی Purolite A-400 انجام شد.  نمونه­برداری از آب خروجی ستون در زمان­های مختلف صورت گرفت و غلظت نیترات آن تعیین گردید. پس از انجام آزمایش­ها، ویژگی­های دینامیکی فرایند جذب با مدل­سازی منحنی­های رخنه و بهره­گیری از مدل­های توماس، بوهارت- آدامز، لین- وانگ و ولبورسکا بررسی گردید. مقایسه­ی مدل­های مذکور نشان داد که هرچند سه مدل اول به لحاظ ساختاری تفاوت داشته و پارامترهای هر یک اطلاعات مفیدی از فرایند جذب در اختیار قرار می­دهد، اما نتایج آنها بخوبی بر هم منطبق بوده و از این رو می­توان بر مبنای روابط بین آنها پارامترهای هر کدام را بدون نیاز به مدل­سازی مجدد، از پارامترهای دو مدل دیگر محاسبه نمود. مدل­ توماس و به تبع آن دو مدل دیگر در پیش­بینی منحنی­های رخنه آزمایش­ها از موفقیت بیشتری در مقایسه با مدل ولبورسکا برخوردار بوده و توانست در تمام مسیر فرایند با دقت بسیار خوبی غلظت نرمال شده­ی نیترات در جریان خروجی از ستون­ها را پیش­بینی کند. در آزمایش آب زیرزمینی آلوده در بخش­های انتهایی منحنی رخنه،  از  دقت  مدل توماس (و دو مدل دیگر) کاسته شده است که دلیل آن وجود یون­های سولفات و فسفات در آب ورودی بود. 

کلیدواژه‌ها


عنوان مقاله [English]

Nitrate Removal from Groundwater by Purolite A-400 Resin in a Fixed bed Column

نویسندگان [English]

  • SA Moussavi
  • H Asadi
چکیده [English]

Appropriate and successful design of an adsorbing column needs to predict dynamic changes in outflow concentration of the substance (i.e. breakthrough curve), which is possible by modeling of the adsorption process. In this study, dynamic experiments were carried out by passing two aqueous solutions of 75 and 150 mg-NO-3 L-1, and a polluted groundwater from Guilan province through a packed bed column of anionic resin, Purolite A-400. Outflow solution was sampled at different time intervals, and the samples were analyzed for nitrate concentration. Dynamic behavior of adsorption was evaluated by modeling of breakthrough curves using Thomas, Bohart-Adams, Lin-Wang and Wolborska models. Comparison and evaluation of the models showed that though the first three models were structurally different and their parameters provided useful information about adsorption process, the data simulated by them were almost the same, and thus parameters of each model could be predicted from the parameters of the two other models without refitting. The predicted curves by the models of Thomas, Bohart-Adams and Lin-Wang were in more agreement with the measured curves than the Wolborska model in all parts of the breakthrough curves, and the dynamic parameters of adsorption process were determined by them more accurately. In the experiment with the polluted groundwater, Thomas model (and other two similar models) deviated from the experimental data at the end of the adsorption process which seemed to be due to the presence of sulfate and phosphate ions in the inflow water. 

کلیدواژه‌ها [English]

  • Bed equivalent
  • Bed volume
  • Breakthrough point
  • Critical bed depth
  • Exhaustion point
  • Stoichiometric time
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