کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4997683 1459916 2017 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Simultaneous microbial reduction of vanadium (V) and chromium (VI) by Shewanella loihica PV-4
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
پیش نمایش صفحه اول مقاله
Simultaneous microbial reduction of vanadium (V) and chromium (VI) by Shewanella loihica PV-4
چکیده انگلیسی


- Simultaneous reduction of V(V) and Cr(VI) by Shewanella loihica PV-4 is realized.
- Enhancement of Cr(VI) bioreduction is observed with the suppressed V(V) reduction.
- Both membrane components and cytoplasmic fractions contribute to these reductions.
- Most Cr(VI) is reduced extracellularly, V(V) tends to be reduced intracellularly.

Toxic vanadium (V) and chromium (VI) often co-exist in wastewater from vanadium ore smelting and their reductions by bacterial strain Shewanella loihica PV-4 is realized simultaneously. After 27-d operation, 71.3% of V(V) and 91.2% of Cr(VI) were removed respectively, with citrate as organic carbon source. Enhancement of Cr(VI) bioreduction was observed with the suppressed V(V) reduction. V(IV) and Cr(III), the main reduction products, precipitated inside the organisms and attached on cell surfaces. Both membrane components containing cytochrome c and cytoplasmic fractions containing soluble proteins as well as NADH may contribute to these microbial reductions. Most Cr(VI) were reduced extracellularly and V(V) tended to be reduced through intracellular process, as revealed by mapping the microbial surface and a line scan across the cell, performed by scanning transmission electron microscopy. This study provides an efficient alternative for controlling combined pollution caused by these two metals based on microbial technology.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Bioresource Technology - Volume 227, March 2017, Pages 353-358
نویسندگان
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