Short sections of pressure treated wooden frame & decking (Peachcroft OX14)

Our wooden climbing frame was well used but reached the end of its life and couldn't be dismantled for re-assembly. I also replaced a section of decking so have the wood from both to dispose of. Note that in both cases this is previously pressure treated external wood. Advice from a Google search is that it shouldn't be burned as this can release the toxins that are impregnated in pressure treatment, so this is really being offered for construction purposes.

There are three types of wood and fine if you want to take some and leave others:

* Circa 50 sections which are generally 7cm x 7cm (3" x 3") and 20-25cm (6"-8") long. This came as pressure treated (to survive outside) and has never been painted or stained since. I've removed most of the nails/screws/fixings but some small metalwork may remain. I =was thinking these could be firewood but was then told about the advice not to burn.

* Wooden frame - about 20 sections cut to lengths between 80 & 120cm, mostly 7cm x 7cm (3" x 3") square sections. This came as pressure treated (to survive outside) and has never been painted or stained since. Most of the metal fixings have been removed but some remain.

* Decking - about 25 sections that are cut up to be circa 50cm long. The decking was originally pressure treated and has since been stained or painted by myself a number of times over the years, however much of this has since worn off.