Effect of Phospholipid on Pyrite Oxidation and Microbial Communities under Simulated Acid Mine Drainage (AMD) Conditions

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• 作者：Andro-Marc Pierre Louis ; Hui Yu ; Samantha L. Shumlas ; Benoit Van Aken ; Martin A. A. Schoonen ; Daniel R. Strongin
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：July 7, 2015
• 年：2015
• 卷：49
• 期：13
• 页码：7701-7708
• 全文大小：369K
• ISSN：1520-5851

文摘

The effect of phospholipid on the biogeochemistry of pyrite oxidation, which leads to acid mine drainage (AMD) chemistry in the environment, was investigated. Metagenomic analyses were carried out to understand how the microbial community structure, which developed during the oxidation of pyrite-containing coal mining overburden/waste rock (OWR), was affected by the presence of adsorbed phospholipid. Using columns packed with OWR (with and without lipid adsorption), the release of sulfate (SO₄^{2鈥?/sup>) and soluble iron (Fe_Tot) was investigated. Exposure of lipid-free OWR to flowing pH-neutral water resulted in an acidic effluent with a pH range of 2鈥?.5 over a 3-year period. The average concentration of Fe_Tot and SO₄2鈥?/sup> in the effluent was 鈮?0 and 鈮?0 mg/L, respectively. In contrast, in packed-column experiments where OWR was first treated with phospholipid, the effluent pH remained at 鈭?.5 and the average concentrations of Fe_Tot and SO₄2鈥?/sup> were 鈮? and l.6 mg/L, respectively. 16S rDNA metagenomic pyrosequencing analysis of the microbial communities associated with OWR samples revealed the development of AMD-like communities dominated by acidophilic sulfide-oxidizing bacteria on untreated OWR samples, but not on refuse pretreated with phospholipid.}