کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
221532 464260 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Utilization of co-existing iron in arsenic removal from groundwater by oxidation-coagulation at optimized pH
ترجمه فارسی عنوان
استفاده از آهن همزیستی در حذف آرسنیک از آبهای زیرزمینی توسط اکسیداسیون انعقاد در pH بهینه سازی شده
کلمات کلیدی
S، مکمل. OCOP، انعقاد اکسیداسیون در pH بهینه سازی. MOCOP، انعقاد اکسیداسیون اصلاح در حذف pHArsenic بهینه سازی. توام آهن؛ اکسیداسیون و انعقاد و جذب؛ روش سطح پاسخ
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• Co-existing iron used in arsenic removal by oxidation-coagulation at optimized pH.
• Doses of oxidant and pH-conditioner optimized by response surface methodology.
• Field trial of the method has been carried out in arsenic affected areas.
• Arsenic is removed to below 2 μg/L undetectable by AAS from 100 μg/L.
• The cost is reduced by about 20% compared to that of the OCOP method.

Oxidation-coagulation at optimized pH (OCOP) using NaHCO3, KMnO4 and FeCl3 is an efficient and low-cost arsenic removal method for domestic to large community scale applications. In this method, a high dose of the oxidant is used when the groundwater contains high concentration of coexisting iron for oxidising all ferrous and arsenate ions. A fixed dose of 25 mg/L of FeCl3 is also employed as coagulant despite the formation of ferric ions from the coexisting ferrous ions. The present study aimed at utilization of the coexisting iron for the coagulation purpose and reducing the coagulant dose. Response Surface Methodology was employed to optimize the doses of the oxidant and the pH conditioner. A field trial at various arsenic affected rural habitations has shown that the present modified OCOP method to be more efficient and economical than the OCOP method reducing both arsenic and coexisting iron concentrations to less than 2 μg/L and 0.1 mg/L, respectively, at a lower cost. The modified OCOP method is useful especially with high concentration of coexisting iron.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Chemical Engineering - Volume 4, Issue 3, September 2016, Pages 2683–2691
نویسندگان
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