Environmental Concerns With Reuse and Disposal of
Chromated Copper Arsenate (CCA) Treated Wood
William Hinkley Chief, Bureau of Solid and Hazardous Waste
Florida Department of Environmental Protection
New CCA Research Sponsored by the Florida Center For Solid and Hazardous Waste Management
Gainesville, Florida
Lena Ma, PhD., University of Florida, Gainesville, Florida
Helena Solo-Gabriele, Ph.D., P.E., University of Miami, Coral Gables, Florida
Timothy Townsend, Ph.D., University of Florida,
The Center’s mission is to coordinate and engage in research relating to solid and hazardous waste management issues
Participating Institutions
UWF FAMU
FSU/ UF
USF UCF FIT
FAU FIU/U M
I. Overview of CCA Treated Wood In Florida:
Types, Amounts and Disposal Forecast
Introduction for CCA Treated Wood
Q Most Common Wood Preservative Used in the U.S. and Florida, Approx. 80% of the wood preservation market (including creosote and pentachlorophenol)
Q Represents over 97% of the waterborne wood preservative market
Introduction
0
100
200
300
400
500
600V
olum
e, m
illio
n cu
bic
feet
CCA
All Products
All Products
CCA
Production
1970 1996 Year
World Production of Arsenic Trioxide: 1998
Mexico
Belgium
Kazakhstan
Russia Other
France China
Ghana
Chile Source: USGS
1969
1971
1973
1975
1977
1979
1981
1983
1985
1987
1989
1991
1993
1995
1997
U.S. Demand for Arsenic (1969 - 1998)
0
5000
10000
15000
20000
25000
30000
35000 M
etric
Ton
s
Source: USGS
Treated Wood
Agriculture Other
TX 28
17
M
E
W A
1 3
OR 10
NV
1CA 1 1
ID 5
2
AZ2
N M 1
S D
3 N E
2 KS 0
O K
3
MN 9
I A2
MO
9 AR
LA 15
WI 1 1
IL 9
IN 7
MI 11
OH11
T N 7 S
2 1 AL 3 9
F
L25
ME 1
NY
6
G A
40
SC 17 N C 28
WV
9VA 20
PA 19
VT 0 NH 1
RI 1 NJ 2
DE
0
HI 5
AK
0
MD
6
ND
1
KY 8
MT 2
W A
1 3 D
C C
B
D
E A = Low D = High B = Moderate E = Severe C = Intermediate
Introduction
WY
2A
UT CO 5
MA 3
CT 1
Introduction
The Amounts of CCA Used For Different Applications
Application Retention Value (lb/ft3)
Above ground: lumber, timbers, and plywood 0.25 Ground/Freshwater contact: lumber, timbers, plywood 0.40 Salt water splash, wood foundations: lumber, timbers, and plywood Structural poles
0.60
Foundation/Freshwater: pilings and columns 0.80 Salt water immersion: pilings and columns 2.50
Table I-2: Retention Requirements for CCA-Treated Wood (AWPA, 1996)
Motivation
Q CCA ---> Chromated Copper Arsenate
Q CCA-Treated Wood contains high concentrations of chromium, copper, and arsenic (≈1000 mg/kg for each metal)
Q When burned, metals accumulate in the ash (concentrations ≈ 10,000’s mg/kg for each)
Motivation
Unburned Wood Burned Wood
Metals Reg. Limit
(mg/kg)
Other Woods (mg/kg)
CCA-Trt Wood
(mg/kg)
Other Woods (mg/kg)
CCA-Trt Wood
(mg/kg) Arsenic
Chromium
Copper
41 DL-1.5 290-1200 7-74 8600-64,000
1,200 DL-21 1740-2400 12-140 1700-41,000
1,500 DL-8.5 1000-1100 41-190 2600-39,000
Disposal Forecast Based Upon A Mass Balance Approach
Production Use Disposal
Extrapolated from Service Life Industry 25 to 40 yearsStatistics
Disposal Forecast
Quantity of CCA-Treated Wood Sold in Florida (1996),
Q 28 million ft3 of wood product ³(17 million treated in FL and 11 million imported)
Q 6300 tons of chemical ³3000 tons as CrO3 (1600 tons as Cr) ³1100 tons as CuO (920 tons as Cu) ³2200 tons as As2O5 (1400 tons as As)
Mill
ion
ft3, d
ispo
sed
Long-term Disposal Forecast
35 Florida Statistics No Change in CCA Use
Hypothetical Case If 100% Alt. Chem. Used by 2002
30
25
20
15
10
5
0
Today Hypothetical Case Year
1964
1968
1972
1976
1980
1984
1988
1992
1996
2000
2004
2008
2012
2016
2020
2024
2028
2032
2036
2040
2044
II. Fate of CCA Treated Wood Waste in Florida
How is Discarded CCA-Treated Wood Managed in Florida?
Q It is estimated that most discarded CCA-treated wood enters the construction and demolition (C&D) debris waste stream.
Q A small amount is disposed via lined municipal waste landfills and waste-to-energy facilities.
Q Reuse and recycling is minimal.
Wood is One of the Largest Components of C&D Debris
2% 6%15% 6%
2%
27% 42%
Wood
Source: NAHB Research Center Average of 4 Sites
Plastic
Roofing
Brick
Wood
Drywall
Metal
Misc.
How is Wood in the C&D Debris Stream Managed? Q C&D Landfills Q C&D Recycling Facilities ³ Major Market: Wood Fuel ³ Growing Market: Landscape Mulch
Wood from C&D Debris
Processed C&D Wood
How is CCA-Treated Wood Managed? Q C&D debris processing facilities that
separate wood for reuse and recycling are required to remove CCA-treated wood.
Q Very difficult to accomplish. Q Very difficult to enforce. Q Facility visits indicate that very little
separation is occurring.
C&D LandfillMSW Landfill
C&D DebrisCCA-Wood Removed
from Service
C&D Processing Facility
Processed Wood
Land Application
?
Wood Fuel Facility
Separated CCA Utility Poles
CCA-Treated Wood is Visible at Times
Most of the time, the identification of CCA-treated wood is difficult, especially for wood from demolition.
Once wood is processed, separation of CCA-treated wood is not a realistic possibility.
How much CCA-treated wood is present in C&D debris wood in Florida?
Q Samples of processed wood were collected from 12 facilities around the state.
Q Samples were homogenized and analyzed for Cu and Cr Concentrations.
Q A mass balance was performed to estimate the amount of CCA-treated wood present.
Sample Collection
0
1000
2000
3000
4000
5000
6000
7000 C
r in
Ash
ed S
ampl
e (m
g/kg
) Type A
Type B
Type C Comparison of Copper and Chromium Concentrations
0 500 1000 1500 2000 2500 3000 3500 4000
Cu in Ashed Sampled (mg/kg)
Results
Q The average amount of CCA-treated wood in recovered wood from C&D waste processing facilities was approximately 6% (based on 0.25 pcf, type C).
Q This amount ranged from background levels to over 20%.
Florida Regulatory and Cleanup Criteria for Arsenic
Q Drinking Water MCL: 50 ug/L
Q TCLP: 5 mg/L
Q Soil Clean Up Target Levels (SCTLs) ³ Residential: 0.8 mg/kg ³ Industrial: 3.7 mg/kg ³ Leachable: 27.5 mg/kg
Conclusions of the 1999 National Research Council report on the Drinking Water Standard for arsenic:
“…it is the subcommittee’s consensus that the current EPA MCL for arsenic in drinking water of 50ug/l does not achieve EPA’s goal for public-health protection and, therefore, requires downward revision as promptly as possible.”
Ash from the Combustion of Wood
Q Much of the recovered wood from C&D processing is combusted as fuel.
Q Research indicates that 6% of this wood on average is CCA-treated wood.
Q The presence of CCA-treated wood in the fuel stream presents potential environmental risks in regard to air emissions and management of the ash.
Note on Arsenic
Q It is well documented that arsenic volatilizes at higher temperatures.
Q The amount of oxygen also plays a role. Q In CCA-treated wood combustion studies in the
literature, arsenic is often missing from the mass balance at the end of the study.
Q High technology air pollution control equipment must be installed at facilities whose fuel stream includes CCA-treated wood.
Characterization of Ash
Q Ash could not be obtained from the wood-burning facilities.
Q Ash was produced in an industrial furnace. Q Specific wood streams were combusted. Q Ash was chemically analyzed to assess
management options.
Summary of Wood Burns
Batch # Description of Batch Burn Time Average Burn(min) Temp. (°F)
1 Untreated Wood 90 1018 2 CCA-treated wood, 0.25 pcf 90 1014 3 CCA-treated wood, 0.60 pcf 95 1039 4 CCA-treated wood, 2.50 pcf 95 953 5 Weathered Wood 105 1030 6 C&D 1 130 928 7 C&D 2 90 821 8 C&D 3 85 829 9 Mixture 1 95 1125 10 Mixture 2 105 1005
Sample Preparation, Shredding
Sample Ashing
Florida Power & Light Industrial Furnace
Grate
Ash Catch Pan
Ash
Analysis of Ash for Direct Human Exposure Risk
Q All ash samples exceeded Florida’s residential SCTL for arsenic.
Q All samples, with the exception of untreated wood ash, exceeded Florida’s residential SCTL for chromium.
Analysis of Ash for Leachability
Q Conduct TCLP ³ Is the ash a hazardous waste? ³ How much CCA causes the ash to be
hazardous? Q Conduct SPLP ³ Will metals leach from the ash under simulated
rainfall?
Clean W
ood 0.2
5 pcf
0.6pcf
2.5 pcf
Weathere
dC&D 1C&D 2C&D 3
5% C
CA a5%
CCA b
TCLP & SPLP Comparison for Arsenic A
rsen
ic L
each
ate
Con
cent
ratio
n (m
g/l)
1000
100
10
1
0.1
0.01
TCLP SPLP
TC (5)
GWCTL (0.05)
Summary
Q The amount of CCA currently in the C&D wood stream is approximately the same amount (6%) as will result in ash from combustion of the wood to be hazardous by toxicity characteristic for arsenic, and in some cases chromium.
How Does CCA-Treated Wood Behave under TCLP? Q Discarded arsenical-treated wood is exempt
under RCRA. Q This is not recognized by all states. Q TCLP results are also used to make other
risk-based decisions regarding the management of a waste.
Consider TCLP Results for a Commercially Purchased CCA-Treated Wood Q 0.25 pcf, Type C Dimensional Lumber. Q Size-reduced to consistency of sawdust.
TCLP Results on 0.25 pcf CCA (Type C) Sawdust Le
acha
te C
once
ntra
tion
(mg/
l) 7
6
5
4
3
2
1
0 As Cu Cr
Questions Have Been Raised on the Effect of Size Reduction Q The smaller the size, the greater the surface
area available for leaching. Q Same wood sample was tested at different
sizes.
Arse
nic
Con
cent
ratio
n (m
g/l)
As TCLP Results 0.25 pcf CCA (Type C) 8 as Function of Surface Area 7
All samples = 100g 6
5
4
3
2
1
0
One Block Five Blocks Chipped Wood Sawdust
Implication of TCLP Results
Q Tests were only for one wood sample, and thus can not be used to draw conclusions for all similar wood products (more testing will be conducted).
Q Results fall within the range of previously reported data.
Q Results indicate that CCA-treated wood of this nature should not be disposed in unlined landfills.
The TCLP is Sometimes Considered Too “Aggressive”
Q The acetic acid nature of the TCLP leaching fluid is considered by some to be an unrealistic occurrence in the “real world.”
Q The SPLP has been designed to look at leaching from acid rain.
Q SPLP was conducted on the same wood sample.
Arse
nic
Con
cent
ratio
n (m
g/l)
As SPLP Results 0.25 pcf CCA (Type C) as Function of Surface Area
9
8
7
6
5
4
3
2
1
0 One Block Five Blocks Chipped Wood Sawdust
Implication of SPLP Results
Q Results for SPLP are similar to TCLP, especially for Arsenic and Chromium.
Q Confirms that CCA-treated wood should not be disposed in unlined landfills, regardless of the acidity of the leaching solution.
What About Reuse Outside the Landfill?
Q It is widely agreed that size-reduced CCA-treated wood by itself should not be used as a landscape mulch.
Q But if C CA-treated wood is occurring in processed C&D wood, how much can be present with causing undue risk?
Leaching from Land Applied Mulch
Q The SPLP is the test most commonly used to assess leaching from a land applied waste.
Q Previous SPLP results were for whole wood. Q A small number of tests were performed on
various mixtures of CCA-treated wood and untreated wood.
As Concentration in SPLP Leachate from Artificial Mulch Mixes10
TC
Ars
enic
Con
cent
ratio
n (m
g/l)
1
0.1 GWCTL
DL 0.01
0% CCA 1% CCA 5% CCA 10% CCA 100% CCA
Land Application Considerations
Q If the same approach that is used for contaminated soil is used to assess the direct human exposure risk of mulch, the wood must be free of CCA-treated wood.
Q When considering leaching, CCA-treated wood must be present at levels of less than 1% to meet current groundwater standards.
Previous Results Indicated that CCA might Leach in a Landfill
Q Small-scale laboratory leaching tests might not always present the correct picture.
Q Plus, CCA-treated wood is one of only a number of components disposed in C&D landfills. Besides untreated wood, other components are concrete, metal, drywall, etc.
Q How does CCA-treated wood behave in actual landfills?
Laboratory Column Tests
Q As part of ongoing work characterizing C&D waste leachate, C&D landfills have been simulated in the lab.
Q While laboratory testing can never fully duplicate actual landfill conditions, such testing can provide very valuable information.
Q The most recent round of laboratory tests included CCA wood as part of the waste stream.
Laboratory Leaching Columns
Composition of C&D Test Columns
8.6%
32%13.7%
Southern Yellow
2.4% Pine
1.7%
SYP CCA Drywall Concrete Metal Roofing Other
0.25 pcf Type C,29.2% CCA Treated Wood
12.4%
1 62 3 4 5
Simulated Rainfall
Experimental Design
Collect Collect Leachate Leachate
0.40 Arsenic Concentrations A
s C
once
ntra
tion
(mg/
L)
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
Column 1 Column 6
in Leachate
0 50 100 150 200
Time (days)
Implications of Column Study
Q Only a small amount of CCA-treated wood in the waste stream can result in leachate exceeding the groundwater cleanup target level for arsenic.
Field C&D Test Cells
Q Additional work on the characterization of C&D waste leachate involved the construction of 4 lined test cells.
Q The cells were filled with residential construction debris.
Field Test Cells
Q Leachate that resulted from rainfall infiltrating through the waste was collected and analyzed.
Q Arsenic, Copper, and Chromium were included as part of the analysis.
Cell 1
Cell 4
Cell 3Cell 2
Arsenic in C&D Test Cell Leachate
0
20
40
60
80
100
120
140
160A
rsen
ic (u
g/L)
6/11
/98
6/25
/98
7/9/
98
7/23
/98
8/6/
98
8/20
/98
9/3/
98
9/17
/98
10/1
/98
10/1
5/98
10/2
9/98
11/1
2/98
11/2
6/98
Chr
omiu
m (u
g/L)
80
70
60
50
40
30
20
10
0
Cell 1
Cell 4
Cell 3
Cell 2
Chromium in C&D Test Cell Leachate
6/11
/98
6/25
/98
7/9/
98
7/23
/98
8/6/
98
8/20
/98
9/3/
98
9/17
/98
10/1
/98
10/1
5/98
10/2
9/98
11/1
2/98
11/2
6/98
Implications of Tests Cell Results
Q The presence of CCA-treated wood may present an environmental risk during disposal in unlined landfills.
Q Leachate constituent concentrations in actual C&D debris landfills of similar waste composition will be greater (deeper waste, more compact landfill).
Arsenic Concentration in Leachate from Lined Florida Class III Landfills Which Take
Primarily C&D Waste (In ug/L)
Site Min Max Ave of Detects #Detects PBCSWA Site Cell C 7 77 21 18 PBCSWA Site Cell D 13 33 22.3 6 West Pasco 1 4 125 77.5 4
Summary of Environmental Issues Q Ash with even very small amounts of CCA
can not be applied outside the landfill. Q When wood fuel contains 3 to 5% or more
CCA-treated wood, the resulting ash will very likely be a hazardous wastes.
Summary of Environmental Issues Q Although exempt under RCRA, discarded
CCA treated wood will at times exceed the toxicity characteristic under RCRA.
Q The presence of CCA-treated wood in processed C&D wood used for mulch greatly limits this reuse option for wood. Amounts as small as 1% may cause exceedances of drinking water standards for arsenic with the SPLP.
Summary of Environmental Issues Q Leachate from C&D debris landfills
containing CCA-treated wood does contain arsenic and chromium, often at levels above regulatory limits.
Q Disposal of CCA-treated wood should be in lined landfills.
III. Potential Soil Contamination Issues
Background Concentrations ofBackground Concentrations of Arsenic in Florida Surface SoilsArsenic in Florida Surface Soils
M. Chen, L.Q. Ma, W.G. Harris & A.G. Hornsby
Soil and Water Science Department University of Florida
Geographical representationGeographical representation
Arsenic Concentrations and Frequency DistributionArsenic Concentrations and Frequency Distribution
0
10
20
30
40
50
60
70
80
90
100
110
5 10
25
10099989590
84 7573
55 50
Acc
umul
atio
n %
Median GM
DEP cleanup goal
Upper baseline limit
95% limit
<0.03 <0.09 <0.17 <0.35 <0.42 <0.8 <0.95 <1.71 <2.99 <5.58 <7.03 <16.9 <50.6
Arsenic concentrations in soils
As,
mg/
kg .
Arsenic Concentrations (ppm) inArsenic Concentrations (ppm) in Wet, Borderline and Dry soilsWet, Borderline and Dry soils
100.0 H
emis
ts
Sapr
ists
Aqu
ents
Aqu
epts
Aqu
olls
Aqu
ults
Aqu
alfs
Udu
lts
Uda
lfs
Psam
men
t
Hum
ods
Aqu
ods
BorderlineSoils (82)
GM = 0.48
Wet Soils (71) GM = 1.67
Upland Soils (288) GM = 0.27
10.0
1.0
0.1
0.0
Arsenic Concentrations in Soil Samples From Beneath CCA Treated Decks in Connecticut (mg/kg)
Deck # Deck Age
Range Avg. Background Soil Avg.
1 .3 3-19 9 2.6 2 2 7-91 34 4.2 3 5 34-99 61 4.9 4 7 44-333 139 4.9 5 7 57-215 113 2.7 6 8 50-350 138 4.4 7 15 6-80 40 1.9 Overall 3-350 76 3.7
Source: Stilwell, D.E. and K.D. Gorny. 1997. “Contamination of soil with Copper, Chromium and Arsenic Under Decks Build from Pressure Treated Wood”. Bull. Environ. Contam. Toxicol. (1997) 38:22-29
Fil Jro. 35211601$3 ,. 1
ate lllilllries 48 • Talem 88 • fm98 • Wealll!t108
----~ PLAYGROUND AT mumrn cum
Pesticide~ foundat t Kidspac~I
..• AddIUonal soil tt$ll will be ., conducted after the <hemiCJI from pl'CS"'-"'·trc'l•cd wood,.,.. found, bur tM school will opco_Moo<by. , ·
,C
NO SKATEBOARDS OR BIKE RIDING. NO BARE FEET. WEAR PROPER FOOTWEM_NO ALCOHOLIC BfYERi1ccr
0 '
HULES or .KIDS SPACE -
Arsenic concentrations in soil samples taken on 8/4/99 around the school playground
Sample ID Sample location
wt (g)
vol (L)
Response (ug/L)
dilution Concentration in soils (mg/kg)
Target % recovery
Blank Reagent blank 1.0 0.1 3.5 1 0.35 Reference SRM 2710 1.0 0.1 267.2 20 534 626 86% Reference SRM 2710 1.0 0.1 314.5 20 629 626 101%
1 under east stair ramp 1.0 0.1 32.6 1 3.26 2 east ramp-btwn boards 1.0 0.1 151.4 1 15.1 3 slide pole 1.0 0.1 65.8 1 6.58 4 under deck 1.0 0.1 89.1 1 8.91 5 front end of car 1.0 0.1 69 1 6.90 6 inside car 1.0 0.1 146.3 1 14.6 7 front ramp-btwn boards 1.0 0.1 160.6 1 16.1 8 picnic table 1.0 0.1 118.7 1 11.9 9 west pole @ swing 1.0 0.1 63.6 1 6.36 10 under seating deck 1.0 0.1 208.9 1 20.9 11 under jungle gym 1.0 0.1 141.9 1 14.2 12 under tire manhole 1.0 0.1 37.1 1 3.71 13 under "bath tub" 1.0 0.1 51.7 1 5.17 14 upper tunnel 1.0 0.1 59 1 5.90 15 under tunnel 1.0 0.1 50.5 1 5.05 16 under tunnel platform 1.0 0.1 289.8 1 29.0 17 clean soil 1.0 0.1 2.5 1 0.25 18 east steps 1.0 0.1 54.8 1 5.48 19 electric pole east 1.0 0.1 356.3 1 35.6 20 electric pole west 1.0 0.1 118.8 1 11.9 21 "bark" from e-pole west 0.5 0.1 2290 20 9160
Mean arsenic concentrations in soils = 10.9 mg /kg
TALLAHASSEE 1
CHILDREN'S PLAYGROUND
IV. Management and Regulatory Options
Mill
ion
ft3, d
ispo
sed
Long-term Disposal Forecast
35 Florida Statistics No Change in CCA Use
Hypothetical Case If 100% Alt. Chem. Used by 2002
30
25
20
15
10
5
0
Today Hypothetical Case Year
1964
1968
1972
1976
1980
1984
1988
1992
1996
2000
2004
2008
2012
2016
2020
2024
2028
2032
2036
2040
2044
Sources Of Construction and Demolition Debris Waste In The U.S. (EPA, 1998)
Sources of Construction and Demolition Debris in the U.S. (EPA, 1998)
Commercial NewConstruction
3% Residential New Construction
5% Residential Demolition
15% Commercial Rennovation
21%
Commercial Demolition 33%
Residential Rennovation 23%
Construction and Demolition (C&D) Landfills In Florida
Q 168 Permitted Sites Total:
³ 97 All C&D Debris
³ 71 Landclearing Debris Only
³ Down from 278 in 1996
Q Sites taking all C&D Debris must have ground water monitoring, financial assurance, other BUT no liners
Potential Management Options For CCA Treated Wood
Q Source separation at const./demolition sites Q Identification/separation at C&D MRFs Q Work with large end-users (e.g. utilities,
FDOT, agriculture) Q “Take back” program for poles and pilings Q Mark/stamp CCA and non-CCA wood
Sorting Study
Sorting Study Results: Construction Debris
Lumber - CCA Cutoffs 5%
10% Plywood - CCA
8%
Cutoffs - CCA 15%
Plywood 35%
Pallets 8%
Lumber 19%
Identifying CCA-Treated Wood in Mixed Wood Streams Treated Untreated
Q Chemical Stains Very Promising Advantage: Low Capital Cost Disadvantage: Labor Intensive
Q X-ray Fluorescence Very Promising Advantage: Potential for On-line System Disadvantage: Cost
Potential FDEP Regulatory Options For CCA Treated Wood
Q Prohibit disposal at unlined C&D landfills Q Require disposal in lined landfills Q Require separation at C&D MRFs Q Prohibit production of mulch from CCA wood Q “Unadopt” CCA exemption in 261.4(b)(9)CFR Q Remediation at existing C&D sites?
Estimates of Mercury in Florida Discards (Tons) Product/Year 1995 1996 1997 2000 Hsehold Batteries 7.42 5.63 3.65 1.24 Electric Lighting 1.11 1.17 1.25 0.98 Switches, thermostats 2.96 2.97 2.93 3 Other (amalgams, etc) 0.44 0.41 0.38 0.3 Total 11.93 10.18 8.21 5.52
Estimates of Lead in Florida Discards (Tons) Product/Year 1995 1996 1997 2000 Veh. Batts (95%recy) 4646 1524 2567 2586 Small Sealed Batts 339 377 402 572 TV Tubes 1144 1144 1144 1768 Computer CRTs 691 742.00 736 1033 Glass&Ceramics 450 453 456 463 Circuit Bds 141 123 105 51 Plastics 166 137 124 127 Other(solder, cans) 169 144 142 138 Total 7745 4644 5676 6738
Estimates of Cadmium in Florida Discards (Tons) Product/Year 1995 1996 1997 2000 NiCd Batteries 100.24 112.99 123.86 185.43 Plastics 10.47 10.49 10.52 10.58 Pigments 0.52 0.52 0.52 0.52 Plating 4.11 3.00 3.07 1.51 Other (Rubber, misc) 6.92 7.62 2.56 2.65 Total 122.26 134.62 139.93 200.69
V. Alternative Wood Preservatives
Alternative Wood Preservatives Chemicals Meeting These Criteria
Q AAC: Alkyl Ammonium Compound (a.k.a. DDAC) Q ACC: Acid Copper Chromate Q ACQ: Ammoniacal Copper Quat Q Borates Q CBA: Copper Boron Azole Q CC: Ammoniacal Copper Citrate Q CDDC: Copper Dimethydithiocarbamate
Alternative Chemicals - Status Q AAC - Three AAC manufacturers were contacted
and all indicated that AAC is not generally marketed as a “stand-alone” wood preservative. Ü ACQ, Cu + AAC.
Q Borates - Can not be used outdoors Ü taps into a NEW treated wood market, “whole house”
Q ACC - Contains Chromium
Remaining Chemicals: ACQ, CBA, CC, CDDC
Use Product ACQ Type B&D
CBA CC CCA CDDC
Above ground lumber, timbers, ties 0.25 0.204 0.25 0.25 0.10*
Above Ground plywood 0.25 0.25E 0.25 Soil or Water Use lumber, timbers, ties 0.40 0.40 0.40 0.20 Soil or Water Use plywood 0.40 0.40 0.40 General Construction posts and columns 0.40 0.40 0.40 0.20 Structural Composites lumber & timbers 0.60 0.60 0.20 Used on Permanent Wood Foundations
lumber & plywood 0.60 0.60
Highway Construction poles 0.60 0.60 Land and Freshwater Foundations
piles 0.80
Marine & Coastal Waters
lumber, timbers, ties, & plywood
2.50 2.50
Marine & Coastal Waters
piles 2.50
AWPA Standardization, Values Provided are Chemical Retention
Alternative Chemical Costs
Costs for a 12 foot deck board (1 1/4” x 6 “)
CCA CDDC ACQ ACQ with Water Repellant
$8.94 $10.29 $9.90 $11.47
($6.99-$11.69) ($9.28-$12.00) ($9.29 - $10.50) ($9.95-$14.25)
n=15 n = 16 n = 2 n = 10
Restrictions and Bans on CCA in Other Countries
Q Total bans: Switzerland, Vietnam, Indonesia
Q Restrictions: Japan, Denmark, Sweden, Germany
“The ACQ preservative in Preserve treated wood is a copper plus quat system that provides the same level of protection to wood as CCA preservatives against decay, rot and termite attack without the use of arsenic and chromium.”
: : ·~dP.P R AZOLE L : • P8~S$lll1E REATE • • JI TIMBEf:lllil:S ti •i.
s:•., rs s:11•""• • .flollY•G 8•• ,,!'! .. , ,ii :AQswers to
commonly asked ) uestions
“…Copper Azole is a significant improvement over traditional CCA treatment as it substantially reduces reliance on and exposure to the more toxic heavy metals such as chromium and arsenic throughout all stages of production, distribution and use. …it is environmentally responsible to specify or use Copper Azole treated lumber.”
Announcing New Tanallth® E
Koppers:.l::llclison Is pleased to announce the New Zealand launch of our new non-chromiurT1., non-arseni Qreservative product, Tanallth®E.
Why a new product 7
Tanalith® CCA has a proud record of use in NZ for more than 50 years, and internationally fo, longer still. In this time h has been proven to be an effective and safe product to use, protecting countless millions of cub~ metres of timber from blofogicar attack. As effective as it is however, the continued use of CCA is corr1n9 under 1hrrun .d.u&__t_Q the po1enua1 and pe1ce1ved throats posed oy 1rie ,nc1us1on of t\ed~ metals 111,;e chromium arid arsen~ ~tJ11Qred•en1s
The threats to CCA use have arisen In different forms in different countries. In Japan, CCA is t1t11ng out of filvou.r oue 10 re~ons on landfill di~sal of treated WOod that has been removed from se!Vlce, and also difflelJlty meeting tough Slormwater limits at treatment plants fo, arsenic. In parts of Scandinavia, CCA use has been restricted to in-ground and lnduSlrlat timber applications only.
Closer to home, we lind that due to percaived risks and the wish to promote an "eco-lrlendly" Image, no CCMreated WOod may be used In the Sydney OIY'll)lc VIiiage; tbe NSW Department of Public Works Is Intending to adopt the same policy tor a.II tt's construction from 2000 on.
tn NZ no restriction& have so far been tmposed oo CCA use, t-1,_1wever ;round cun1art11r1.111on 3n-:Js1urn1waler d1sc:11a,g~ l!lnl!S may fo,ce rre<11~rs an,t , e:a1lers ltJ upgral'Je storage af83S to m1n11nlS& lh& 1n1~ olJ Q.a.cil,ate trom lreolllY. C.CA· l<tUIIQ,.j WOOCI
The 111ck!iot1 wcutd-w1r1e g,oup of compdn1e.; (of which Ko~Js:l;.!lckson Is a member) t"fav~ oeen avnue ot lhttse tJnvet9p1rtg_ tre,,u1s tor >ome 1ur11,, aod have been develop ng Tanalith® E as a possible CCA-altsrnalive.
Ko ppers-Hlc.kson Timber Protection (New Ze.al.,ndJ Umlted
“The aim of the development program was to create a wood preservative that had the same excellent timber durability properties as CCA but without the inclusion of chromium or arsenic. An additional desired feature was complete compatibility with existing CCA treatment plants and processes.”
Key Unknowns
Q Current EPA re-registration review and recommendations in RED (Spring, 2000?)
Q Revisions to As MCL (Jan, 2001?) Q Results of As Bioavailability Study Q Additional FL soil contamination studies Q Actions by the European Community
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