Timber remediation

A method of chromated copper arsenate (CCA) treated timber remediation, the method comprising:

• contacting the CCA timber with an acidic solvent to provide an acidic extract;
• contacting the CCA timber with an oxidative solvent to provide an oxidative extract and obtain a treated timber;
• separating the treated timber from the oxidative extract and acidic extract to produce a supernatant;
• washing the treated timber with water to obtain a washed timber and a wash extract;
• and
• pressing the washed timber with a solvent to obtain a remediated timber and a press extract,
• wherein one or more of the steps is conducted using continuous counter current extraction (CCE),
• wherein the acidic solvent is an aqueous mineral acid,
• wherein contacting the CCA timber with the acidic solvent or contacting the CCA timber with the oxidative solvent is performed simultaneously,
• wherein separating the oxidative extract and the acidic extract from the contacted timber is performed simultaneously,
• wherein the press extract is returned to said washing when a concentration of a metal in the press extract exceeds a concentration of a metal in the wash extract, and
• wherein said washing comprises adding a neutralizing solution which is carbonate or bicarbonate, and said washing is conducted under a neutralizing condition such that a residual acid in the treated timber is neutralized.