Arsenic Leaching From Mulch Made from Recycled C&D Wood Arsenic Leaching From Mulch Made from Recycled C&D Wood a 1 Tomoyuki Shibata, 1 Helena Solo-Gabriele,

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Presentation transcript:

Arsenic Leaching From Mulch Made from Recycled C&D Wood Arsenic Leaching From Mulch Made from Recycled C&D Wood a 1 Tomoyuki Shibata, 1 Helena Solo-Gabriele, 2 Timothy Townsend and 2 Brajesh Dubey 1 University of Miami and 2 University of Florida Objectives: Quantifying the releases of arsenic from C&D wood mulch and evaluation of the effect of colorant on arsenic leaching

FAQ: Mulch Roles Roles –Prevention of Evaporation of moisture & soil erosions Evaporation of moisture & soil erosions –Aesthetic Applications Applications –Gardens, parks, Playgrounds Made of Made of –Trees, leaves, straws, peat, or recycled C&D wood

Wood Recycling Facility Facilities, Florida USA Facilities, Florida USA –CCA up to 30 % –Will increase

Colored Mulch Red dye (popular in FL) –Iron oxide Combine with As May inhibit As leaching ?

Materials & Methods Collection & Sorting C&D wood Shredding wood Mixing mulchLeachate generation

Mixing handmade mulch Coloredmulch Mulch mulch% treated wood Noncolored0%mulch 5%mulch 100%mulch

Materials & Methods Collection & Sorting C&D wood Shredding wood Mixing woodLeachate generation 0% treated wood MulchMulch 5% treated wood MulchMulch 100% Treated wood MulchMulch

Leachate Generation SPLP leachate University of Florida Field leachate University of Miami Non-coloredColored 0 %treated 5 % 100 % 5 cm mulch (800g/box) Geotextile

EPA 7060A & GFAA Field leachate: 1 year monitoring

SPLP Leachate Field leachate Average/year %CCAmulchNonColoredColoredNonColoredColored 0 % (untreated)<0.012 < < % % Results: As in the leachate (mg/L) -59% -73%-22% -24%

Discussions From 100%CCA From 5%CCA From 0%CCA FL GWCTL 0.05 mg/L A half year colorant effect %CCA, time, pH of rainfall Detection limit mg/L

Mathematical model %CCA, time, pH r = ~ from non-colored much As = %/100(2+40t (7-pH rain ) 5 /t 2 ) from colored much As = %/100(1+40t (7-pH rain ) 5 /t 2 )

Conclusion 5%CCA mulch 5%CCA mulch Colorant Colorant  Sorting C&D wood before the production

Acknowledgements Funding Agency Funding Agency –Florida Center for Solid and Hazardous Waste Management Extra Help Extra Help –Gary Jacobi, Geoff Klug, Michael Laas, Caitlin Feikle, Colleen Block, Yuki Sotome, and Alicia Muniz: University of Miami Thank you