کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4487299 1317023 2006 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Arsenic removal from high-arsenic water by enhanced coagulation with ferric ions and coarse calcite
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Arsenic removal from high-arsenic water by enhanced coagulation with ferric ions and coarse calcite
چکیده انگلیسی

Arsenic removal from high-arsenic water in a mine drainage system has been studied through an enhanced coagulation process with ferric ions and coarse calcite (38–74 μm) in this work. The experimental results have shown that arsenic-borne coagulates produced by coagulation with ferric ions alone were very fine, so micro-filtration (membrane as filter medium) was needed to remove the coagulates from water. In the presence of coarse calcite, small arsenic-borne coagulates coated on coarse calcite surfaces, leading the settling rate of the coagulates to considerably increase. The enhanced coagulation followed by conventional filtration (filter paper as filter medium) achieved a very high arsenic removal (over 99%) from high-arsenic water (5 mg/l arsenic concentration), producing a cleaned water with the residual arsenic concentration of 13 μg/l. It has been found that the mechanism by which coarse calcite enhanced the coagulation of high-arsenic water might be due to attractive electrical double layer interaction between small arsenic-borne coagulates and calcite particles, which leads to non-existence of a potential energy barrier between the heterogeneous particles.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 40, Issue 2, January 2006, Pages 364–372
نویسندگان
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