期刊
WATER RESEARCH
卷 34, 期 10, 页码 2742-2746出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0043-1354(00)00019-1
关键词
acid mine drainage; treatment; lithic; remediation
The remediation of streams adversely affected by acidic mine drainage often employs limestone as a neutralization agent. However, metal precipitation on the limestone surface can render it ineffective. This investigation reports preliminary field and laboratory results demonstrating that, in the presence of a mixture of limestone and sandstone. iron preferentially precipitates on the sandstone surface, and iron removal from aqueous solution is greater than with either of the materials alone. First, a river in Tennessee (USA) with preferential iron precipitation was characterized with respect to water quality and lithic surface morphology. Second, a field experiment where lithic samples were placed in an Ohio stream receiving coal mine drainage demonstrated that iron hydroxide preferentially coats quartz-rich lithologies. Finally, laboratory experiments confirmed enhanced iron removal in the presence of mixed lithic surfaces. Based on these results, the use of multiple lithic surfaces, particularly in-stream, has the potential to provide improved methods for the treatment of acidic mine wastes. (C) 2000 Elsevier Science Ltd. All rights reserved.
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