Keywords: Arsenic Contamination, CCA Treated Wood, Wood Disposal and Recycle, CCA Extraction

Chromated Copper Arsenate (CCA) impregnated waste materials are generated during the treating process and from treated wood removed from service. This material is currently land-filled, which creates concerns because of the bulky nature of wood and the potential for leaching of some Cr, Cu and As components of the preservative. A recycling process has been developed whereby up to 99 % of the CCA components are extracted from the waste material. CCA treated wood waste is chipped and reacted with a proprietary lixivient which mobilizes the CCA components and brings them into solution. The Aclean @ wood and other residues pass the TCLP test and can be reused for paper or composite products or disposed of in a normal landfill. The pregnant solution is then passed through another proprietary process to separate the CCA components from the Clean water. The extracted solution, containing Cr, Cu and As can be reprocessed to a condition where it is compatible with CCA treating solutions and could be re-used for treating new wood