A process model of natural attenuation in drainage from a historic mining district
A process model of natural attenuation in drainage from a historic mining district
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DOI：
10.1016/s0883-2927(99)00074-8
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发表时间：
2000-06-01
影响因子：
3.4
通讯作者：
Krumhansl, JL
中科院分区：
文献类型：
--
作者：
Berger, AC;Bethke, CM;Krumhansl, JL
一个过程模型被用来更好地了解在一个历史悠久的矿区排水的化学演变的控制。在新墨西哥州的佩科斯矿山运营单位，废石堆附近的排水呈酸性（pH值在3.0-5.0之间变化），含有高浓度的锌、铝、铜和铅。随着排水流向佩科斯河，pH值增加到7以上，重金属含量减少。在这个排水自然衰减的过程模型显示，pH值的主要控制反应与当地基岩，含有石灰石，并与支流并发混合。模型，占方解石溶解和混合再现所观察到的减少，随着pH值的增加，在水溶液中的金属浓度。污染物浓度衰减主要通过两个不同的途径：铝，铜，铁和铅沉淀直接从溶液中，而锌，镁，锰和SO 4的浓度下降主要通过稀释。此外，铅吸附沉淀氢氧化物表面。(C)2000由爱思唯尔科学有限公司出版。版权所有。
A process model was used to better understand the controls on the chemical evolution of drainage in a historic mining district. At the Pecos Mine Operable Unit, New Mexico, drainage near the waste rock pile is acidic (pH varies from 3.0-5.0) and carries high concentrations of Zn, Al, Cu and Pb. As drainage flows toward the Pecos River, pH increases to greater than 7 and heavy metal content decreases. A process model of natural attenuation in this drainage shows the main controls on pH are reaction with a local bedrock that contains limestone, and concurrent mixing with tributary streams. Models that account for both calcite dissolution and mixing reproduce the observed decrease in aqueous metal concentrations with increasing pH. Contaminant concentrations attenuate primarily via two distinct pathways: Al, Cu, Fe and Pb precipitate directly from solution, whereas Zn, Mg, Mn and SO4 concentrations decrease primarily through dilution. Additionally, Pb adsorbs to precipitating hydroxide surfaces. (C) 2000 Published by Elsevier Science Ltd. All rights reserved.