Program Monday
|
Wednesday 10:10 Jonathan M. Dietz, Ph.D., Iron Oxide Technologies Activated Iron Solids (AIS) Treatment: A Low Cost Long Term Active Treatment Alternative for High Iron AMD Author(s) Jonathan
M. Dietz, Ph.D.
Abstract Widespread deep coal mining has created numerous large underground reservoirs of ferrous iron-laden acidic mine drainage (AMD). These contaminated deep mine reservoirs typically discharge at high volumes (1 to 50 million gallons per day) and at single or multi-point locations. Treatment of these high flow AMD discharges has been accomplished using conventional lime-based treatment, but the high annual chemical, manpower and energy costs, as well as the disposal costs of the low-density (1-4% solids) and impure sludge has limited treatment to regulated discharges and long term treatment of these discharges is a significant liability. Passive treatment is typically not an option due to large land area requirements (20 to 200 acres), uncertain performance, and costly sludge removal. An innovative active treatment known as Activated Iron Solids (AIS) treatment of AMD (patent pending) has been developed to provide a low-cost active treatment alternative. The AIS process involves a self-perpetuating and catalytic surface chemistry oxidation process that occurs at slightly acidic pH to accomplish ferrous oxidation; the required step in the removal of iron from AMD. Also, the AIS process does not require the use of chemicals (e.g., lime) for net alkaline AMD and can use inexpensive powdered limestone for net acidic AMD. AIS Treatment forms a high-density (20 to 30% solids), high iron oxide purity (exceeding 95%) solid that are easily recovered. The AIS Treatment chemistry, experiences in AIS Treatment testing, various system designs will be discussed. Comparisons of AIS Treatment costs to current treatment conventions costs will be provided. Biography EDUCATION: Jon Dietz has spent more than 15 years in the consulting industry
conducting NEPA studies, water quality and aquatic ecology assessments,
R&D of innovative technologies, and designing mine drainage treatment
systems. Jon returned to Penn State University from the consulting
industry in 2000 to continue his education and study environmental
chemistry & engineering and has recently graduated with his Doctorate
in Environmental Engineering. During his doctorate Jon developed “new” heterogeneous
(surface chemistry) ferrous iron sorption & oxidation kinetic
models, which he has used to develop the next generation of AMD treatment
systems, known as AIS/SBR treatment of mine drainage. Jon also conducted
research into abiotic manganese oxidation kinetics and alkalinity
generation from limestone, based on kinetics and solubility reactions,
which he has used to develop new passive treatment approaches. During
his professional career Jon has conducted numerous AMD abatement
projects including watershed assessments, watershed restoration plans,
and prepared final and conceptual designs for over 30 discharges
in the eastern U.S. coal region. He also has provided technical expertise
on water resource studies including a variety of Environmental Assessments
(EA), Environmental Impact Statements (EIS), 319 thermal discharge
studies, National Pollution Discharge Elimination System (NPDES)
studies, and surface water quality standards for ammonia (that have
been promulgated for New Jersey waters). Jon has authored and/or
co-authored over 50 technical reports, journal articles, proceedings
and presentations during his professional career.
|