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首页> 外文会议>International Mine Water Association Symposium >Manganese removal from New Zealand coal mane drainage using limestone leaching beds
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Manganese removal from New Zealand coal mane drainage using limestone leaching beds

机译：使用石灰石浸出床从新西兰煤鬃射流中移除锰

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Limestone leaching beds can be utilised as passive treatment systems for oxidative removal of Mn(II) from mine drainage. Oxidation of Mn(II) by O_2 is kinetically inhibited at circumneutral pH, however it can be catalysed by Mn oxidising microorganisms and by mineral surfaces, particularly those of Mn oxides. Although limestone treatment can be effective, the mechanism of Mn removal is not well understood.A series of six laboratory-scale reactors were built to determine the relative importance of microbial Mn oxidation and autocatalytic Mn oxidation in limestone leaching beds. Duplicate reactors were constructed using limestone, limestone with pyrolusite, and quartz (as a control). Acid mine drainage (AMD) containing 2 mg/L Mn, 0.3 mg/L Zn, and 0.08 mg/L Ni was collected from a stream on the West Coast of New Zealand. The 'biotic' set of reactors had AMD leaching through the rock bed, while AMD treated with biocide was percolated through the 'abiotic' reactors.The limestone, and limestone with pyrolusite reactors removed Al and Mn from the AMD solution. Removal of Mn by limestone alone is rninirnal, and is enhanced by the presence of pyrolusite in a reactor. The most effective removal of Mn was achieved in the biotic limestone reactors, and microbial Mn (II) oxidation appears to be important for optimal removal of Mn from solution. Inoculating the limestone beds with pyrolusite boosted removal efficiency of the reactors. Pyrolusite addition to limestone beds could be considered if maximum Mn removal is required immediately, however once microbial communities are established any benefit will be negligible.
机译：石灰石浸出床可用作从矿山排水中氧化Mn（II）的被动处理系统。 O_2的Mn（II）氧化在循环pH下动力学抑制，但是它可以通过Mn氧化微生物和矿物表面，特别是Mn氧化物的催化催化。虽然石灰石治疗可以是有效的，但不太了解MN去除机制。构建了一系列六种实验室级反应器，以确定微生物Mn氧化和自催化Mn氧化在石灰石浸出床中的相对重要性。使用石灰石，石灰石的重复反应器使用吡咯岩和石英（作为对照）构建。含有2mg / L Mn，0.3mg / L Zn和0.08mg / L Ni的酸性矿山排水（AMD）从新西兰西海岸的溪流中收集。 “生物”的反应器一套具有通过岩石床浸出的AMD浸出，而用杀生物剂处理的AMD通过“非生物”反应器渗透。石灰石和石灰石与热溶胶反应器除去Al和Mn，从AMD溶液中除去Al和Mn。仅通过石灰石除去Mn是Rninirnal，通过反应器中的聚肌石存在而增强。在生物石灰石反应器中实现Mn最有效的去除，并且微生物Mn（II）氧化似乎对于从溶液中最佳地除去Mn的重要性是重要的。用吡咯岩接种石灰石床，使反应器的去除效率提高。如果立即需要最大的Mn去除，则可以考虑加入石灰岩床的吡咯沸石，但是一旦建立微生物社区，任何益处都会忽略不计。

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