Arsenic Leaching From Mulch Arsenic Leaching From Mulch Made from Recycled C&D Wood 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
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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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Arsenic Leaching From Mulch Arsenic Leaching From Mulch Made from Recycled C&D Made from Recycled C&D
Wood Wood
a1Tomoyuki Shibata, 1Helena Solo-Gabriele,
2Timothy Townsend and 2Brajesh Dubey 1University of Miami and 2University of
Florida
Objectives: Quantifying the releases of arsenic from
C&D wood mulch and evaluation of the effect of colorant on arsenic leaching
FAQ: MulchFAQ: Mulch
RolesRoles– Prevention ofPrevention of
Evaporation of Evaporation of moisture & soil moisture & soil erosionserosions
Results: Results: As in the leachate (mg/L)As in the leachate (mg/L)
-59%
-73%
-22%
-24%
DiscussionsDiscussions
0.00
0.01
0.10
1.00
10.00
100.00
1/11
/04
2/11
/04
3/11
/04
4/11
/04
5/11
/04
6/11
/04
7/11
/04
8/11
/04
9/11
/04
10/1
1/04
11/1
1/04
12/1
1/04
1/11
/05
Days (month/day/year)
Ars
en
ic i
n t
he
mu
lch
le
ac
ha
tes
(m
g/L
)
From 100%CC
AFrom
5%CCA
From 0%CCA
FL GWCTL 0.05 mg/L
A half yearcolorant effect
%CCA, time, pH of
rainfall
Detection limit 0.003 mg/L
Mathematical modelMathematical model%CCA, time, pH %CCA, time, pH
0.000
5.000
10.000
15.000
20.000
25.000
0 50 100 150 200 250 300 350 400
t (days)
Ars
en
ic i
n t
he
mu
lch
le
ac
ha
te (
mg
/L)
N100
N100 model
r = 0.836 ~ 0.954
from non-colored much
As = %/100(2+40t-0.7+32(7-pHrain)5/t2)
from colored much
As = %/100(1+40t-0.7+12(7-pHrain)5/t2)
ConclusionConclusion
5%CCA mulch5%CCA mulch
Colorant Colorant
Sorting C&D wood before the Sorting C&D wood before the production production
AcknowledgementsAcknowledgements
Funding Agency Funding Agency – Florida Center for Solid and Hazardous Florida Center for Solid and Hazardous
Waste ManagementWaste Management Extra HelpExtra Help
– Gary Jacobi, Geoff KlugGary Jacobi, Geoff Klug, Michael Laas, , Michael Laas, Caitlin Feikle, Colleen Block, Yuki Caitlin Feikle, Colleen Block, Yuki Sotome, and Alicia Muniz: University of Sotome, and Alicia Muniz: University of MiamiMiami