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Copper Sequestration Using Local Waste Products Jim Ippolito Research Soil Scientist USDA-ARS Kimberly, ID. Presentation Outline. Why worry about Cu in Idaho? Waste materials Beneficial use Laboratory solution sorption studies Greenhouse soil sorption studies Conclusions.

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  1. Copper Sequestration Using Local Waste ProductsJim IppolitoResearch Soil ScientistUSDA-ARSKimberly, ID

  2. Presentation Outline • Why worry about Cu in Idaho? • Waste materials • Beneficial use • Laboratory solution sorption studies • Greenhouse soil sorption studies • Conclusions

  3. Why Worry About Cu in Idaho? (nass.usda.gov/QuickStats/)

  4. Local Wastes • Can we beneficially reuse Amalgamated Sugar Co: • Spent Lime Waste? • 274,000 tons/year • Coal Ash? • 19,000 tons/year • Goal is to sequester Cu

  5. Laboratory Solution Sorption Study • Fly ash or Lime waste • 1g into 50mL centrifuge tubes • Add 50mL of increasing Cu solutions in pH buffers • Rates equivalent to 2500, 5000, 12500, 25000, 75000, 100000 mg Cu/kg • pH: 6, 7, 8, 9 • Shake for 1 month and analyze solution for Cu • Replicated 3 times

  6. Next Question • Can lime waste sorb excess soil Cu? Healthy Alfalfa Cu-Affected Alfalfa

  7. Greenhouse Soil Cu Sorption • Soil received: • 0, 250, 500, 1000 mg Cu/kg • Incubated for ~9 mo • Lime waste • 0, 0.5, 1.0, 2.0% by weight (0,10,20,40 tons/ac) • Incubated for 3 months • Alfalfa • 15 seeds/pot • 2.5 months of growth

  8. Greenhouse Soil Cu Sorption • Measured: • Plant yield • Plant Cu content • DTPA extractable soil Cu • Soil phases that Cu could be associated with: • Soluble species/carbonates/cation exchange sites • Fe/Mn (hydr)oxides • Organics • Residuals

  9. Cu added = 0, 250, 500, 1000 mg kg-1 Lime Waste added = 0, 0.5, 1, 2% by wt 0% Lime Waste 0.5% Lime Waste 0 250 500 1000 0 250 500 1000 1% Lime Waste 2% Lime Waste 0 250 500 1000 0 250 500 1000 Soil pH = 7.9; biochar pH = 8.5

  10. Sequential Soil Cu Extraction

  11. Conclusions • Lime waste and fly ash sorb solution Cu • Decreasing pH increases sorption • Fly Ash: ~26,000 mg Cu/kg • Lime Waste: ~45,000 mg Cu/kg • Lime waste addition to Cu-laden soil • No improvement in alfalfa yield • Decreased alfalfa Cu content • No effect on extractable (i.e. DTPA) soil Cu • No major discernable differences in soil Cu phases

  12. Conclusions • The use of lime waste: • Appears to be a viable option for sequestering solution copper. • Would not be recommended for alkaline soils containing excess copper.

  13. Thank youQuestions? Jim Ippolito, Ph.D. Research Soil Scientist USDA-Agricultural Research Service Northwest Irrigation and Soils Research Laboratory Kimberly, Idaho Email: jim.ippolito@ars.usda.gov Phone: (208)423-6524

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