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Produc uction o n of an Iron O Oxide P Produ duct from
- m M
Mine W e Water er: 1 15 Y Year R Repor
- rt
Robert S Hedin Ted Weaver
Hedin Environmental Pittsburgh, Pennsylvania USA
Produc uction o n of an Iron O Oxide P Produ duct from om M - - PowerPoint PPT Presentation
Produc uction o n of an Iron O Oxide P Produ duct from om M - - PowerPoint PPT Presentation
Produc uction o n of an Iron O Oxide P Produ duct from om M Mine W e Water er: 1 15 Y Year R Repor ort Robert S Hedin Ted Weaver Hedin Environmental Pittsburgh, Pennsylvania USA Marchand System, Lowber PA Fe, mg/L 100 10 20
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Marchand System, Lowber PA
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10 20 30 40 50 60 70 80 90 100 Jul-06 Jul-07 Jul-08 Jul-09 Jul-10 Jul-11 Jul-12 Jul-13 Jul-14 Jul-15 Jul-16 Jul-17
Fe, mg/L
Influent Wetland out
1,850 gpm
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Constructed Wetlands for Wastewater Treatment (D.Hammer) 1989. CRC Press. 856 pp. Designing and Sizing Passive Mine Drainage Treatment
- Systems. 1992. WV Mine
Drainage Task Force Passive Treatment of Coal Mine Drainage. 1994. US Bureau of Mines IC 9389 Iron Removal in a Passive System Treating Alkaline Coal Mine Drainage. 2008. Mine Water Env. International Mine Water Association
The production of a high quality effluent from passive systems has always included wetlands
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Iron sludge recovery steps
- 1. Isolate pond
- 2. Remove excess water
- 3. Pump to dewatering unit
- 4. Dewater and dry
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pigment reactivity
Sales Summary Total sales: 4,840 ton Average sales: 297 ton/yr Pigment portion: 92%
100 200 300 400 500 600 700 800
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
tons sold (dry)
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Goethite (sienna) Hematite (burnt sienna) + heat
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Color and Pigment Strength
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Iron Oxide Reactivity
- Sorption and reactivity
- Metals: As, Cu, Cd, Zn, Pb, more
- oxyyanions: AsO4
3-, PO4 3-, SeO3 2-, Se4 2-
- Redox reactions
- Fe(OH)3 + H2S FeS + FeS2 + S0 + Fe2+
- Fe(OH)3 + organics Fe2+ + CO2
- Trace mineral and biologically active
- Catalyst
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Particle Size and surface area affect pigment strength and reactivity
Laboratory Material SA, m2/g (BET method) University of Pittsburgh, Environmental Engineering Dept. Marchand 144 (101-175) Pennsylvania State University, Materials Science Laboratory Marchand 125
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TRAPPS: Amendment for Pb-contaminated soils
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- 1,000
2,000 3,000 4,000 5,000 5 10 15 20 25 30
Water extractable phosphorus (mg/kg) g/L
Marchand Iron Oxide and Dairy Manure
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Use of IO to control H2S
- React with H2S
- Raise redox and
prevent H2S formation
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Element As Cd Co Cr Cu Mo ppm ppm ppm ppm ppm ppm Marchand 23 2 4 14 10 < 2 EPA Part 503 limits 41 39 na 1,500 1,500 57 Element Ni Pb Se Zn Hg ppm ppm ppm ppm ppb Marchand 9 11 < 3 23 <1 EPA Part 503 limits 420 420 36 2,800 57
Metals of concern in Marchand iron oxide
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Miscellaneous Potential IO Uses
- Control Se release from coal refuse
- Donovon and Ziemkiewicz, J Env Quality, 2014
- Lessen Cd, Cu, and Zn in soil
- Liu et al., Soil and Sediment Contamination, 2014
- Fertilize Fe-deficient soils and ecosystems
- CO2 sequestration: Hedin and Hedin, Mine Water and
the Environment, 2015
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Summary
- HE has sustained the sale of iron oxide recovered
from mine drainage
- Majority of sales as pigment
- Growth is in use of iron oxide in remediation
projects
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