Treatment plant operations generate small quantities of waste materials contaminated with wood preservatives - for example, sludges, contaminated sawdust, yard dirt. A practical system involving the immobilisation of such wastes has been established to assist the operators to safely dispose to landfill sites. The results of cold water and hot dilute acid leaching regimes are described, which simulate conditions likely to be found in a landfill site. By using controlled mixing procedures, appropriate packaging and documentary control, the waste can be safetly disposed to landfill in a condition which will remain stable and with no adverse impact to the environment.

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