Basic Evaluation Of Sorting Technologies For
CCA Treated Wood Waste.
Author(s)
K. Yasuda, M. Tanaka & Y. Deguchi
Abstract
Two sorting technologies including an X-ray fluorescence technique and a Laser-induced
breakdown spectroscopy (LIBS) technique were investigated for
separating chromate copper arsenate (CCA) treated wood from other wood types
in the wood waste stream. X-ray fluorescence was tested in the laboratory using
a portably available X-ray fluorescence spectrometer. Operational parameters
for continuous sorting using LIBS technology were established. These
parameters concluded that chromate was the most sensitive metal for analysis,
analysis time was less than 1 second per wood sample. LIBS technology shows
considerable promise for continuous separation of large quantities of CCA
treated wood from other wood types in the field using an on-line sorting system.
Keywords: CCA treated wood, continuous sorting, color reacted with chemical
stain, X-ray fluorescence(XRF), Laser-induced breakdown spectroscopy (LIBS).
1 Introduction
Chromated copper arsenate (CCA) is a wood treatment preservative containing
copper, chromium and arsenic. The purpose of the chemical is to protect wood
from biological deterioration. CCA treated wood comes in a range of retention
levels, from 4 kgm -3 to 40 kg m -3 . Lower retention levels are used for above
ground applications and in freshwater contact, whereas higher retention levels
are used for wood that is in contact with the ground or saltwater. The types of
products treated with CCA include plywood, lumber, timbers, fence posts, utility
poles and others (AWPI [1]).
Keywords
CCA treated wood, continuous sorting, color reacted with chemical
stain, X-ray fluorescence(XRF), Laser-induced breakdown spectroscopy (LIBS).
Related Book
Other papers in this volume
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