If you can't sell it or give it away to a charity for free then nobody is going to want it so the only option you have left is waste disposal and recycling, you could take it to the recycling center yourself or try the bulky waste collection service from your local authority, use skips or use a waste disposal and recycling company like ours. 

Everything left in your property at the moment that needs to be recycled or disposed of would be classed as domestic recycling or domestic waste and could be recycled at your local council recycling center for free subject to you getting it there.