کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
146627 456374 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Removing heavy metal ions with continuous aluminum electrocoagulation: A study on back mixing and utilization rate of electro-generated Al ions
ترجمه فارسی عنوان
حذف یونهای سنگین فلزات با الکتروکواگولاسیون آلومینیومی مداوم: مطالعه در مورد ترکیب مخلوط و میزان استفاده از یونهای الکتریکی تولید شده
کلمات کلیدی
الکتروکواگولاسیون مداوم، جابجایی عظیم، مخلوط برگشت یون فلز سنگین، جذب
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• The mass transfer of species in continuous electrocoagulation channel was discussed.
• The back mixing is dependent on both fluid dynamics and mass transfer.
• Increasing current density or residence time could intensify the back mixing.
• The molar ratio of M/Al could be used to quantify the utility of electro-generated Al ions well.
• The optimization and reactor design could be based on the optimization of M/Al ratio.

Electrocoagulation (EC) technology is based on rapid in situ dissolution of sacrificial anode to generate precipitates and flocs capable of removing heavy metal ions. The lack of mechanism-based approach to reactor optimization has limited its implementation. The continuous EC process for treating heavy metal ions (Ni2+) was studied. Effects of some experimental parameters on the heavy metal ions removal were investigated. The back mixing was investigated through the concentration distribution at the direction of streamline. In continuous EC process characterized by in situ generation of absorbents, the degree of back mixing is dependent on both fluid dynamics and mass transfer. The degree of back mixing increases with the increment of current density or residence time. A new universal parameter named as molar ratio of M/Al (M is the heavy metal ions) was introduced to quantify the utilization rate of electro-generated Al ions (or Fe ion) in EC process. The M/Al ratio is found to decrease with the increment of current density and residence time. Further, the relationship between the ratio and traditional parameters (removal efficiency and the consumption of energy and electrode) was discussed in this article. The optimization and reactor design could be based on the optimization of M/Al ratio.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 267, 1 May 2015, Pages 86–92
نویسندگان
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