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حذف نیترات از آب زیرزمینی با استفاده از ستون جاذب حاوی رزین Purolite A-400 | ||
| دانش آب و خاک | ||
| مقاله 2، دوره 21، شماره 4، پاییز 1390، صفحه 17-34 اصل مقاله (325.63 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| نویسندگان | ||
| سیدعلی موسوی* ؛ حسین اسدی | ||
| 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 | ||
| : اکی‌والان بستر؛ حجم بستر؛ زمان استوکیومتری؛ عمق بحرانی بستر؛ نقطه‌ی اشباع؛ نقطه‌ی رخنه | ||
| 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 | ||
| مراجع | ||
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