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一价阳离子和水溶性有机质对生物沥浸中次生铁矿物形成的影响
引用本文:柏双友,梁剑茹,周立祥.一价阳离子和水溶性有机质对生物沥浸中次生铁矿物形成的影响[J].矿物学报,2011,31(1):118-125.
作者姓名:柏双友  梁剑茹  周立祥
作者单位:南京农业大学,资源与环境科学学院,环境工程系,江苏,南京,210095
基金项目:国家自然科学基金,江苏省研究生培养创新工程项目
摘    要:在嗜酸性氧化亚铁硫杆菌(Acidithiobacillus ferrooxidans)作用下,污泥生物沥浸体系中常会有次生铁矿物形成,这些矿物对污泥脱水和重金属溶出有重要影响。本研究模拟生物沥浸体系,考察了一价阳离子(K+、NH4+、Na+)和污泥DOM(dissolved organic matter)对次生铁矿物形成的影响。结果表明,一价阳离子生成次生黄铁矾类矿物的能力迥异,其中K+的成矾能力最强,120 mmol/L NH4+和80 mmol/L Na+会抑制体系中黄钾铁矾形成。在1.6 mmol/L K+-120 mmol/L NH4+-40 mmol/L Na+和1.6 mmol/L K+-80 mmol/L NH4+-80 mmol/L Na+两个处理所得矿物的结晶度均低于1.6 mmol/L K+-80 mmol/L NH4+-40 mmol/L Na+处理所得矿物的结晶度。另外,在50 mg/L DOM(以DOC计)存在的生物氧化体系,Fe2+最大氧化速率为4.96 h-1,比没有DOM存在时降低48.1%,矿物结晶度也明显低于后者。可见,过高的一价阳离子和DOM含量会影响A.ferrooxidans菌生理生化活性,降低Fe2+氧化速率,继而影响Fe3+供应,使微环境中的黄铁矾形成动力发生改变,最终在一定程度上影响了次生铁矿物的形成。

关 键 词:生物沥浸  一价阳离子  DOM  亚铁氧化速率  次生铁矿物

Effects of Monovalent Cation and Dissolved Organic Matter on the Formation of Biogenic Secondary Iron Minerals in Bioleaching System
BAI Shuang-you,LIANG Jian-ru,ZHOU Li-xiang.Effects of Monovalent Cation and Dissolved Organic Matter on the Formation of Biogenic Secondary Iron Minerals in Bioleaching System[J].Acta Mineralogica Sinica,2011,31(1):118-125.
Authors:BAI Shuang-you  LIANG Jian-ru  ZHOU Li-xiang
Institution:BAI Shuang-you,LIANG Jian-ru,ZHOU Li-xiang(Department of Environmental Engineering,College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095)
Abstract:Secondary iron minerals were formed under the effect of Acidithiobacillus ferrooxidans,which having major impacts on the sludge dewatering and heavy metals leaching in bioleaching system.Two simulative experiments were carried out to study the effect of monovalent cation(K+,NH4+,and Na+) and sludge dissolved organic matter(DOM) on the secondary iron minerals formation.The results indicated that monovalent cation ability varied widely on the formation of biogenic secondary iron minerals facilitated by A.ferr...
Keywords:DOM
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