NETL conducts a wide variety of in-house research within its Office of Science and Technology. Research pertaining to IEP-Coal Utilization By-Products (CUB) is conducted within the By-Product Utilization Team of the Environmental Science and Technology Division
The objective of the By-Product Utilization Team is to investigate the environmental implications of reusing CUB. Bottom and fly ash can be used in applications including cement and concrete formulation, mine-land reclamation, and agriculture. The gypsum produced as a byproduct of some wet flue gas desulfurization (FGD) units is currently used in the manufacture of wallboard. The team’s goal is to proactively address environmental concerns that arise as a result of changes in the nature of the byproduct, such as increased loss of ignition in fly ashes from low-NOx burners, and the production of additional or altered by-products from new pollution control technologies.
- The team’s long-term leaching protocol, which has been applied to a large selection of conventional Class F ashes, is now being applied to lignite ashes and to the byproducts of new technologies such as selective catalytic reduction/selective non-catalytic reduction and mercury-capture. Current work also focuses on the fate of mercury in CUB.
- The team has developed a short-term leaching test that can be used to evaluate the environmental safety of various environment/CUB combinations. Currently, it is being evaluated in an inter-laboratory comparison of batch leaching techniques.
- The team’s work on high calcium residues, including low-rank coal ashes, FGD, wallboard and CUB containing calcium- based sorbents is using both fixed-bed and continuously stirred leaching procedures. While the current emphasis is on mercury, the leaching of other metals is also being monitored.
- The team is investigating the presence and leachability of aromatic and polynuclear-aromatic hydrocarbons in CUB and is attempting to determine if current and contemplated pollution control technologies affect the amount of polycyclic aromatic hydrocarbons found.
- Past work has also included a field investigation of the effects of using alkaline CUB to control acid mine drainage from surface coal mine spoils at a local airport.
Related Papers and Publications:
- Relative Solubility of Cations in Class F Fly Ash, published in Environmental Science & Technology Magazine [PDF-71KB]
- Factors Controlling the Solubility of Mercury Adsorbed on Fly Ash presented during the 2005 World of Coal Ash [PDF-224KB]
- Leaching Methods Applied To The Characterization Of Coal Utilization By-Products presented during the 2005 World of Coal Ash [PDF-130KB]
- Water Quality Changes Related to CUB Bulk Placement at the Rostraver Airport presented during the 2005 World of Coal Ash [PDF-321KB]
- Preferential Acidic, Alkaline and Neutral Solubility of Metallic Elements in Fly Ash, presented during the 2005 World of Coal Ash [PDF-329KB]
- Leaching of CUB Using a CSTX, presented during the 2005 World of Coal Ash [PDF-137KB]
- Release of Ammonia from SCR / SNCR Fly Ashes, presented during the 2005 World of Coal Ash [PDF-37KB]
- Effects Of pH, ORP, And Conductivity On Leaching Of Trace Metals From Fly Ash, presented during the 2005 World of Coal Ash [PDF-158KB]
- Distribution of Mercury in FGD Byproducts, presented during the 2005 World of Coal Ash [PDF-115KB]
- Inter-laboratory Comparison of Leaching Methods, presented during the 2005 World of Coal Ash [PDF-336KB]
- Rapid Batch Characterization of Coal Utilization By-Products, presented during the 2005 World of Coal Ash [PDF-161KB]