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July 31-1030-Naomi Anderson

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2019 SWCS International Annual Conference
July 28-31, 2019
Pittsburgh, Pennsylvania

Publicado en: Medio ambiente
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July 31-1030-Naomi Anderson

  1. 1. Abandoned Mine Drainage (AMD) Treatment for Water Quality Improvement, Nutrient Management NAOMI ANDERSON HEDIN ENVIRONMENTAL
  2. 2. Agenda o Abandoned Mine Drainage (AMD) overview o AMD treatment o Available grants for studying and treating AMD o Mine Drainage Residuals (MDR) o MDR Applications: Phosphorous immobilization
  3. 3. Abandoned Mine Drainage (AMD) o Water that is polluted from contact with mining activity, associated with coal mining in Appalachia o Forms when surface or groundwater encounters exposed rocks in an abandoned mine and reacts with minerals and oxygen FeS2 + 7 02 + 2 H2O --> 2 Fe2 + 4 SO4 + 4 H+ o Leads to high metal content and altered pH (acid/alkaline), high conductivity, high SO4
  4. 4. AMD Treatment Active Treatment Treatment goals: neutralize acidity, raise pH, remove metals Passive Treatment
  5. 5. Trout Unlimited AMD Technical Assistance Program o Small grants ($5,000-$15,000) o Funded by PADEP o Used to: o Study AMD o Make conceptual treatment plans o Perform O&M on existing treatment systems o Nonprofits, watershed groups, municipalities, land trusts o Fast turnaround, easy application
  6. 6. Mine Drainage Residuals (MDR) o Solids produced through the treatment of mine drainage o Fe, Al, and Ca oxides, hydroxides, carbonates o Considered nonhazardous by PA DEP o Thousands of tons produced annually at systems operated by private companies, PA DEP, and non-profits o Routinely disposed of through burial or landfilling o MDR management can be substantial cost of operations of mine drainage treatment systems
  7. 7. MDR and Phosphorus Management o MDR consists of Fe, Al, and Ca solids that have capacity for adsorbing or reacting with phosphate o Reactions shift P to a solid form that is not water extractable o Adding MDR with P-sorption capacity to manure should decrease water extractable P and decrease environmental mobility of P o Novel means to lower the P Source Coefficient o Potential new BMP for producers with P concerns o Win-win for dealing with both AMD and Ag pollution
  8. 8. “Utilizing Mine Drainage Residuals to Control Phosphorus from Land-Applied Animal Manure” Project Manager: Trout Unlimited Principal Investigator: Hedin Environmental Funding Phase I - NRCS Conservation Innovation Grant (NFWF administered) Phase II & III, - PA Growing Greener Program Technical Steering Committee ◦ PA DEP, Office of Water Resources Planning ◦ USDA Agricultural Research Service, University Park, PA ◦ Penn State University Department of Ecosystem Science and Management ◦ USGS Leetown Science Center, Kearneysville, WV
  9. 9. Research Questions o Do MDRs have chemical components of concern for use in agriculture? o How effective are MDRs for decreasing water extractable P in manures? o Do MDR amendments decrease P mobility in land-applied manures? o Do MDR additions affect crop yields? o How would MDR be incorporated into manure management practices?
  10. 10. Methods o Collected 21 MDR samples from coal mine drainage treatment systems that varied in water chemistry and treatment technology o Chemical variation: • Low pH acidic with Fe, Al, Mn • Neutral pH alkaline with Fe o Treatment Technologies • Pebble lime • Hydrogen peroxide • Limestone (passive) • Aerobic ponds/wetlands (passive) o Varied particle size, dose, initial WEP
  11. 11. Dose-effect lab/field testing results o MDR can significantly decrease WEP of manure o Factors that influence the efficacy of the treatment • MDR chemistry • MDR particle size • Water extractable P content of manure o All scenarios resulted in decreasing water extractable P from 22% to 66% o MDR addition decreased WEP similar to bench testing o Dusty injection method; solved by modifying position of supersack in the tank
  12. 12. Next Research Phase: Crop Yields
  13. 13. Questions? Thank you!