کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8863044 | 1620195 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Bioremediation of arsenic-contaminated groundwater by sequestration of arsenic in biogenic pyrite
ترجمه فارسی عنوان
بازیابی آبهای زیرزمینی آرسنیک با استفاده از آرسنیک در پیریت بیوژنیک
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کلمات کلیدی
آرسنیک، سولفات کاهش باکتری ها، درمان زیستی، پیریت آرسیین،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
چکیده انگلیسی
Pyrite (FeS2) is the most common sulfide mineral in the Earth's crust, and it commonly contains minor amounts of arsenic. Here we show that authigenic pyrite can remove arsenic from contaminated groundwater and this can be used as a new and relatively inexpensive remediation process. Laboratory batch experiments presented show that fine-grain natural pyrite is an effective sorber of dissolved arsenic. Arsenic sorption onto pyrite is shown to increase with increasing pH, particularly at pHâ¯>â¯5 and at elevated dissolved arsenic concentration. We also present results from a field experiment at an arsenic-contaminated industrial site, which demonstrates the results of stimulation of natural sulfate-reducing bacteria in groundwater by injection of a labile organic carbon source, iron, and sulfate. Within a week, bacterial sulfate reduction triggered the formation of biogenic pyrite nanoparticles, which sequestered arsenic by adsorption and co-precipitation. Microscopic and X-ray diffraction analyses confirmed that pyrite was the only iron-sulfide formed, and that no arsenic-only sulfide phase precipitated (e.g. orpiment or realgar). Pyrite occurs as either 1-10â¯Î¼m euhedral crystals or similar-sized framboids both of which contain 500-4000â¯mg/kg arsenic. As a result, dissolved arsenic decreased from its initial concentration of 0.3-0.5â¯mg/L to below the regulatory clean-up standard for the site of 0.05â¯mg/L in a matter of weeks. In addition to the potential of this technique to remediate anthropogenic arsenic contamination, it is possible that it can be modified to inexpensively treat individual small drinking-water wells contaminated by natural sources of arsenic in many developing nations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Geochemistry - Volume 96, September 2018, Pages 233-243
Journal: Applied Geochemistry - Volume 96, September 2018, Pages 233-243
نویسندگان
James A. Saunders, Ming-Kuo Lee, Prakash Dhakal, Shahrzad Saffari Ghandehari, Ted Wilson, M. Zeki Billor, Ashraf Uddin,