کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4409681 1307500 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Significance of autochthonous Bacillus sp. KK1 on biomineralization of lead in mine tailings
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Significance of autochthonous Bacillus sp. KK1 on biomineralization of lead in mine tailings
چکیده انگلیسی

The aim of the study was to isolate and characterize potential autochthonous bacteria for biomineralization of Pb in mine tailings. A total of four bacteria were isolated from the soil samples and assayed for tolerance to Pb and other heavy metals. Isolate KK1 exhibited maximum Pb resistance and was subsequently identified as Bacillus sp. based on the partial 16S rRNA gene sequences. The isolate KK1 reduced the Pb ions and did not harbor pbrT gene. Selective sequential extraction of bioaugmented soil revealed that the isolate significantly reduced (26%) the exchangeable fraction and increased (38%) the carbonate fraction of Pb. X-ray diffraction studies confirmed the role of bacterially induced calcite precipitation in the bioremediation of mine tailings. A significant increase in the urease (334%), DHO (dehydrogenase) (14%), and phosphatase (37%) activity was observed in the bioaugmented mine soil.


► Biomineralization of lead in mine tailings using autochthonous Bacillus sp. KK1.
► The bacteria significantly reduced exchangeable fraction of lead.
► The bacteria reduced lead nitrate into lead sulfide and lead silicon oxide.
► Bacterial induced calcite precipitation plays a major role in bioremediation.
► The bacteria have significantly increased the enzyme activity in soil.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 90, Issue 8, February 2013, Pages 2267–2272
نویسندگان
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