What disposal methods would you choose for each of the following items requiring disposal? Justify your choice. (Hint: consider legal, environmental, sustainability, corporate social responsibility, probity issues, associated costs and value for money).
40 personal computers in good condition that are being upgraded with more recent models, including 20 computer hard drives that have held politically sensitive material;
an obsolete X Ray machine;
an old commercial refrigerator containing CFCs;
15 crates of unused medical drugs that are past their use by date;
10 used ride on mowers, in various conditions ranging from good to poor, and a collection of accessories for these;
100 mobile phones that are being replaced with newer models; and
5 fire engines no longer required by Emergency Services.