Long-term Performance of Passive Acid Mine Drainage Treatment Systems

Abstract.State and federal reclamation programs, mining operators, and citizen-based watershed organizations have constructed hundreds of passive systems in the eastern U. S. over the past 20 years to provide reliable, low cost, low maintenance mine water treatment in remote locations. While performance has been reported for individual systems, there has not been a comprehensive evaluation of the performance of each treatment type for a wide variety of conditions. We evaluated 83 systems; five types in eight states. Each system was monitored for influent and effluent flow, ph, net acidity, and metal concentrations. Performance was normalized among types by calclating acid loading reductions and removals, and by converting construction cost, projected service life, and metric tonnes of acid load treated into cost per tonne of acid treated. Of the 83 systems, 82 reduced acid load. Average acid load reductions were 9.9 t/yr for open limestone channels (OLC), 10.1 t/yr for vertical flow wetland (VFW), 11.9 t/yr for anaerobic wetlands (AnW), 16.6 t/yr for limestone leach beds (LSB), and 22.2 t/yr for anoxic limestone drains (ALD). Average costs for acid removal varied from $83/t/yr for ALDs to $527 for AnWs. Average acid removals were 25 g/m2/day for AnWs, 62 g/m2/day for VFWs, 22 g/day/t for OLCs, 28 g/day/t for LSBs, and 56 g/day/t for ALDs. It appears that the majority of passive systems are effective but there was wide variation within each system type, so improved reliability and efficiency are needed. This report is an initial step in determining passive treatment system performance; additional work is needed to refine system designs and monitoring.

[1]  T. Wildeman,et al.  The Use of Bench Scale Permeameters for Preliminary Analysis of Metal Removal from Acid Mine Drainage by Wetlands , 1991 .

[2]  R. Wieder,et al.  Processes of Iron and Manganese Retention in Laboratory Peat Microcosms Subjected to Acid Mine Drainage , 1990 .

[3]  Jeff Skousen,et al.  TREATMENT OF ACID MINE DRAINAGE BY PASSIVE TREATMENT SYSTEMS , 1994 .

[4]  A. Rose,et al.  CASE STUDIES OF PASSIVE TREATMENT SYSTEMS: VERTICAL FLOW SYSTEMS 1 , 2002 .

[5]  Douglas A. Kepler,et al.  SUCCESSIVE ALKALINITY-PRODUCING SYSTEMS (SAPS) FOR THE TREATMENT OF ACIDIC MINE DRAINAGE , 1994 .

[6]  C. Zipper,et al.  Factors affecting alkalinity generation by successive alkalinity-producing systems: regression analysis. , 2001, Journal of environmental quality.

[7]  Paul F. Ziemkiewicz,et al.  Acid mine drainage control and treatment. , 2000 .

[8]  P. Eger,et al.  Wetland Treatment for Trace Metal Removal from Mine Drainage: The Importance of Aerobic and Anaerobic Processes , 1994 .

[9]  Robert W. Nairn,et al.  SIZING AND PERFORMANCE OF CONSTRUCTED WETLANDS: CASE STUDIES , 1990 .

[10]  Robert W. Nairn,et al.  The Passive Treatment of Coal Mine Drainage , 2004 .

[11]  Gerald A. Moshiri,et al.  Constructed Wetlands for Water Quality Improvement , 1993 .

[12]  J. Skousen,et al.  Acid-base accounting to predict post-mining drainage quality on surface mines. , 2002, Journal of environmental quality.

[13]  R. Wieder,et al.  Modification of acid mine drainage in a freshwater wetland , 1982 .

[14]  J. Skousen,et al.  Acid Mine Drainage Treatment with Armored Limestone in Open Limestone Channels , 1997 .

[15]  F. Widdel,et al.  Microbiology and ecology of sulfate-and sulfur-reducing bacteria , 1988 .

[16]  Pamela E. McIntire,et al.  The use of bacterial sulfate reduction in the treatment of drainage from coal mines. , 1990 .

[17]  P. Younger.  The adoption and adaptation of passive treatment technologies for mine waters in the United Kingdom , 2000 .

[18]  J. Skousen,et al.  GEOCHEMISTRY OF LABORATORY ANOXIC LIMESTONE DRAINS , 1998 .

[19]  J. H. Tuttle,et al.  Microbial Dissimilatory Sulfur Cycle in Acid Mine Water , 1969, Journal of bacteriology.

[20]  Robert S. Hedin,et al.  Passive Treatment of Acid Mine Drainage with Limestone , 1994 .

[21]  Richard L. Beam,et al.  QUANTITATIVE RESULTS FROM THE FLUSHING OF FOUR REDUCING AND ALKALINITY-PRODUCING SYSTEMS 1 , 2002 .

[22]  Jeff Skousen,et al.  Treatment of acid mine drainage by four vertical flow wetlands in Pennsylvania , 2001, Geochemistry: Exploration, Environment, Analysis.

[23]  IRON RETENTION AND VEGETATIVE COVER AT THE SIMCO CONSTRUCTED WETLAND: AN APPRAISAL THROUGH YEAR EIGHT OF OPERATION , 1994 .

[24]  R. Thomas,et al.  PASSIVE TREATMENT OF LOW-PH, FERRIC IRON-DOMINATED ACID ROCK DRAINAGE IN A VERTICAL FLOW WETLAND I: ACIDITY NEUTRALIZATION AND ALKALINITY GENERATION 1 , 2002 .

[25]  J. Sencindiver,et al.  Effects of Cattails (Typha) on Metal Removal from Mine Drainage , 1988 .

[26]  T. Wildeman,et al.  Passive Treatment of Aluminum-Bearing Acid Rock Drainage , 2002 .

[27]  Terry W. Schmidt,et al.  EVALUATING SUCCESSES IN PASSIVE TREATMENT AT SEQUATCHIE VALLEY COAL CORPORATION IN EAST CENTRAL TENNESSEE , 2001 .

[28]  A. McDonnell,et al.  Use of Crushed Limestone to Neutralize Acid Wastes , 1975 .

[29]  R. Wieder.  Ion input/output budgets for five wetlands constructed for acid coal mine drainage treatment , 1993 .

[30]  P. Ziemkiewicz,et al.  USE OF STEEL SLAG LEACH BEDS FOR THE TREATMENT OF ACID MINE DRAINAGE: THE McCARTY HIGHWALL PROJECT , 2002 .

[31]  K. Schroeder,et al.  Long-term performance of anoxic limestone drains , 2000 .

[32]  William W. Hellier.  THE BI\RK Cl!MP RUN DEMONSTRATION CONSTRUCTED WETLANDS: FINDINGS AND RECOMMENDATIONS FOR FUTURE DESIGN CRITERIA , 1996 .