【Paper】
Mass Balance of Heavy Metals at the Facilities for the Treatment of Construction and Demolition Waste Wood
Yoichi Watanabe*, Yasundo Kurata*, Yusaku Ono* and Masaaki Hosomi**
* Center for Environmental Science in Saitama
** Department of Chemical Engineering, Tokyo University of Agriculture and Technology
† Correspondence should be addressed to Yoichi Watanabe:
Center for Environmental Science in Saitama
（914 Kamitanadare, Kisaimachi, Kitasaitama-gun, Saitama, 347-0115 Japan）


Abstract
In the recycling of waste wood from building demolition, caution is necessary in handling the toxic substances that were used in preservative treatment, for example, CCA that has been used in building foundations. Waste wood resulting from demolition of buildings often contains CCA and other heavy metals from inorganic paints and other dusts. However, there is no information about the stream of heavy metals contained in construction and demolition waste wood. We investigated the chip-making facilities that treat waste wood in Saitama Prefecture, and measured the mass balance of heavy metals. We found that at least 50％ of the heavy metals are sorted out as fuel, and 5 to 70％ are separated into dust as a result of crushing and sieving processes.


Key words: waste wood, wood chips, CCA, heavy metals, mass balance