Mr. Graham,
O'Reilly Auto Parts is prominent in your area according to my search. Their website says they take automotive fluids, I wonder if this includes antifreeze. If you're in the country, why couldn't you pour the antifreeze into a barrel with sawdust in it. Wait a few months and burn the sawdust.
The green folks will tell you that this is a no no, but who listens to them....
Stuart
