Comparison of Environmental Impacts of Wood Treated with Three Different Arsenic-Free Preservatives and CCA CCA-TAG Meeting B. Dubey 1, T. Townsend 1,

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Presentation transcript:

Comparison of Environmental Impacts of Wood Treated with Three Different Arsenic-Free Preservatives and CCA CCA-TAG Meeting B. Dubey 1, T. Townsend 1, H. Solo-Gabriele 2 1 University of Florida, Dept. of Environ. Eng. Sciences 2 University of Miami, Dept. of Civil, Arch. And Environ Engineering August 18, 2005

Research Objective Compare and contrast the potential environmental impact of wood treated with arsenic and chromium free preservatives with that from CCA-treated wood

Specific Objectives 1.Leachate characterization for heavy metals in the leachate produced on co- disposal of pressure-treated wood in C&D and MSW landfill environment 2.Impact of surface water conditions on chemical leaching and aquatic toxicity of pressure-treated wood 3.Impact on soil from pressure- treated wood leachates

Pressure Treated Wood Being Evaluated ACQ : Alkaline Copper QuaternaryACQ : Alkaline Copper Quaternary CBA : Copper Boron AzoleCBA : Copper Boron Azole DOT : Disodium Octaborate TetrahydrateDOT : Disodium Octaborate Tetrahydrate CCA : Chromated Copper ArsenateCCA : Chromated Copper Arsenate

Leachate characterization for heavy metals in the leachate produced on co- disposal of pressure-treated wood in C&D and MSW environment -Simulated C&D landfill environment -Leaching with MSW leachate Disposal Scenarios

The county provided a large area near a paved road for locating the lysimeters.

The driller used a 3-ft bucket auger.

The hole prior to lysimeter installation. 15 ft deep.

The annulus of the holes was backfilled with sand.

Thermocouple wires were included for temperature measurement.

Waste Composition for Simulated C&D Landfill

Waste Composition for Co-disposal of ACQ in Simulated C&D Landfill

Waste Composition for Co-disposal of CCA in Simulated C&D Landfill

Cutting wood into smaller pieces

ACQLead based paintCCA

Loading the Column

C&D Lysimeters

C&D LBP, CCA, Hg lamps Wood blocks added during mixing Wood blocks throughout lysimeter Hg lamps were broken inside lysimeter, starting after first lift LBP, CCA River Rock LBP, CCA Hg lamps

C&D LBP, ACQ, Hg lamps Same as C&D lysimeter with CCA wood, but ACQ treated wood used instead. LBP, ACQ River Rock LBP, ACQ Hg lamps

Compacting the Waste

Water addition

Filling sampling bottles

Copper was below detect in all three C&D column leachates throughout the duration of experiment

Batch Test Results Blocks of CCA and ACQ were leached in leachates from the control columns. The results were compared to results from leaching blocks using the TCLP and SPLP.

As Cu Cr Leaching of CCA Blocks

Leaching of ACQ Blocks Copper Boron

Minimal leaching of copper observed suggesting that disposal of copper-based wood preservatives posses minimal impact to groundwater from copper leaching What will happen if the landfill gets aerobic over a long period??

Leaching of treated wood sawdust with MSW landfill leachate Sawdust samples of CCA, ACQ, CBA and Borate treated wood was prepared from treated wood lumber 26 MSW landfill leachate samples were collected to use as the leaching fluid Batch leaching test of TCLP, SPLP and WET was also conducted for comparison

X mg/L

Summary of results for MSW leaching study Metals leach from pressure treated wood when leached with landfill leachate Leaching concentrations from the pressure treated wood vary with leachate quality Results indicate that the co-disposal of treated wood with municipal solid waste could impact the leachate quality

Impact of surface water conditions on chemical leaching and aquatic toxicity of pressure-treated wood

Parameters being measured Total copper, free copper and toxicity analysis using MetPlate and Algal assay will be performed on each wood block leachateTotal copper, free copper and toxicity analysis using MetPlate and Algal assay will be performed on each wood block leachate Samples will also be analyzed for TOC, TDS, alkalinity and anionsSamples will also be analyzed for TOC, TDS, alkalinity and anions

Some preliminary leaching data

Impact on soil from pressure- treated wood leachates

Decks have been set up at Solar Energy Research Park, UF

Soil column in lab with three soils

Parameters being analyzed Preservative components, pH, ORP, Conductivity in leachate and soil Soil samples being characterized for pH, OM, CEC, Grain size distribution etc.

In summary Out of 4 experiments comparing the treated wood, two have been completed and two are underway Results from uncompleted experiments will be updated in the subsequent meetings

Questions?