کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
233876 465371 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sequential precipitation of Cu and Fe using a three-stage sulfidogenic fluidized-bed reactor system
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Sequential precipitation of Cu and Fe using a three-stage sulfidogenic fluidized-bed reactor system
چکیده انگلیسی

The exposure of sulfides, such as pyrite (FeS2) to water and air leads to the formation of acidic metal and sulfate containing waters, generally referred to as acid mine drainage (AMD). Under anaerobic conditions and in the presence of a suitable electron and carbon source, sulfate-reducing bacteria (SRB) can reduce sulfate to hydrogen sulfide which can precipitate metals as low-solubility sulfides. In the present study, a three-stage fluidized-bed reactor (FBR) system was operated at 35 °C with ethanol as an electron and carbon source for SRB to sequentially precipitate Cu and Fe from synthetic AMD. The system consisted of two pre-settling tanks before a sulfidogenic FBR for the sequential precipitation of Cu and Fe with biogenic H2S gas and HS− containing effluent, respectively. Cu and Fe precipitation efficiencies were over 99% and sulfate and COD removals 60–90%. Biologically produced alkalinity increased the initial pH of the AMD from 3.0 to neutral values.

Research highlights
► Sulfate reducing bioreactors have potential for recovering metals from mine waters.
► Three-stage sulfidogenic bioreactor was used for metal precipitation.
► Sequential precipitation of Cu and Fe was achieved.
► Biologenic alkalinity increased the pH of the water from 3.0 to neutral values.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Minerals Engineering - Volume 24, Issue 11, September 2011, Pages 1100–1105
نویسندگان
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