. Earth Science News .
Managing Coal Combustion Residues In Mines

The report also recommends a more robust program to monitor mine sites where coal residues have been placed. Currently monitoring involves testing water in wells placed around the mine sites. However, the number and placement of wells is generally inadequate, according to the committee.
by Staff Writers
Wayland MA (SPX) Mar 02, 2006
Filling mines with the residues of coal combustion is a viable way to dispose of these materials, provided they are placed so as to avoid adverse health and environmental effects, says a new congressionally mandated report from the National Academies' National Research Council.

The residues left after coal is burned to generate power - often referred to as coal ash - consist of noncombustible coal matter and material trapped by pollution control devices. Enforceable federal standards are needed to guide the placement of coal ash in mines to minimize health and environmental risks, the report says.

Coal combustion in the United States leaves behind enough residue to fill 1 million railroad coal cars each year, and the volume continues to grow along with rising energy demands and improved pollution-control measures. Most of this ash is disposed of in landfills and surface impoundments, but it is increasingly being used in mine reclamation. In addition, about 38 percent of the residues are currently used to make cement, wall board, and other products. The report encourages the continued use of some residues in industrial applications as a way to reduce the amount requiring disposal.

"Because the amount of coal combustion residues is large and increasing, we should pursue productive uses for them," said Perry Hagenstein, chair of the committee that wrote the report and president of the Institute for Forest Analysis, Planning, and Policy, Wayland, Mass. "When such uses are not feasible, putting residues in mines as part of reclamation provides an alternative to landfills and surface impoundments, although potential health and environmental risks must be addressed."

Returning coal combustion residues to mines has certain advantages, the committee said. For example, the residues provide filler for mine reclamation efforts that restore land use conditions at a site, and putting these residues in mines lessens the need for new landfills. The residues may also neutralize acid mine drainage, lessening the potential for some contaminants from mines to enter the environment.

Little is known about the potential for minefilling to adversely impact groundwater and surface water, particularly over long time periods. Because information from minefilling sites is limited, the committee assessed potential risks by examining data on adverse environmental effects from surface impoundments and landfill sites. The data indicate that adverse environmental impacts can occur when coal ash containing toxic chemicals has contact with water or when the residues are not properly covered. The report recommends that minefills be designed so that movement of water through residues is minimized.

To aid understanding of risks and limit the potential for adverse effects, the committee recommends improved characterization of coal combustion residues before they are placed into mines. This would involve understanding the composition of the residues and testing the potential for hazardous chemicals to leach into the environment under all possible conditions in the target mine, particularly with respect to various pH levels. Mine sites also must be well-characterized, which includes developing a clear understanding of groundwater flow patterns.

The report also recommends a more robust program to monitor mine sites where coal residues have been placed. Currently monitoring involves testing water in wells placed around the mine sites. However, the number and placement of wells is generally inadequate, according to the committee. It suggested taking several factors into account - such as rates of groundwater flow and estimated risks from contamination - to place wells in a manner that yields early data on potential water contamination.

Under the federal Surface Mining Control and Reclamation Act, states are generally responsible for broadly regulating the management of coal combustion residues during mine reclamation. While general enough to cover putting residues in mines, SMCRA does not specifically regulate the practice, leading some states to say they lack the power for more explicit regulation. The report says that development of enforceable federal standards would give the states such authority, while allowing sufficient flexibility for adapting requirements to local conditions. Only through enforceable standards can minimum levels of protection be guaranteed nationally, the committee added.

Related Links
National Academies' National Research Council

Portugal Gets Four Bids In Wind Farm Tender
Lisbon, Portugal (AFP) Mar 01, 2006
Four consortiums presented bids Wednesday to the Portuguese government in response to an international tender for the development of a giant wind farm project, an economy ministry spokeswoman said.







  • High Post-Hurricane Rents Push People Out Of New Orleans
  • White House Demands Whirlwind Changes To Hurricane Response
  • Military To Plan For Larger Role In Disaster Relief
  • Urgent Change Needed To Hurricane Response

  • Massive Ancient Flood Linked To Climate Change
  • Fossil Wood Gives Vital Clues To Ancient Climates
  • NASA Under Pressure To Ensure Researcher Independence
  • Greenland Glaciers Dumping Ice Into Atlantic At Faster Pace

  • ESA Satellite Program Monitors Dangerous Ocean Eddies
  • Envisat Marks Fours Year In ESA Mission To Planet Earth
  • Boeing To Process Radar Data From Endeavour
  • NASA Awards Ocean Color Research Support Services Contract

  • Portugal Gets Four Bids In Wind Farm Tender
  • Think Solar Not Nuclear For The Energy Of The Future
  • Managing Coal Combustion Residues In Mines
  • Running A French Farm On Rapeseed Oil And Manure

  • Crippling Indian Ocean Epidemic Detected in France
  • People of African Descent More Vulnerable to TB
  • Americans Downplay Widespread Outbreak Of Avian Flu In Next Year
  • Learning To Love Bacteria

  • Reducing Conflict Between Humans And Carnivores
  • Amber Reveals Ecology Of 30 Million Year Old Spiders
  • Sex: Why Bother? Evolutionary Mysteries Probed At UH
  • Ecosystem In Suspended Animation

  • Suez Tanker Spill Damage At 12 Million Dollars
  • China Ranks Among World's Most Wasteful Users Of Resources
  • Tanker Spills Fuel After Suez Canal Accident
  • China Reports Desert Getting Smaller

  • Role Of 'Showoff Hypothesis' In Social Decisions Investigated
  • Study Of Dinosaurs Part Of Pitt's Plan To Graduate Better Doctors
  • The Evolution Of Right And Left Handedness
  • Better Carbon Dating Revises Some History

  • The content herein, unless otherwise known to be public domain, are Copyright 1995-2006 - SpaceDaily.AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA PortalReports are copyright European Space Agency. All NASA sourced material is public domain. Additionalcopyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement