Your co-worker is wrong. Used coffee grounds have little acid in them....
and if you compost it, it's going to be neutral. (all acording to UC Davis)
You can throw your citrus peels in also among most other foods. It'll break
down just like other food items. I always save a few to put down my garbage
disposer to give it a fresh smell.

"Anthony Ward" wrote in message
...
The canteen at my workplace is trying to improve its recycling
statistics and so is bagging up the used coffee grounds from the
machine and offering this to customers for their garden compost bins.
A colleague has said this is not a good idea because the grounds are
too acidic. I would appreciate knowing the thoughts of experienced
gardeners on this please. I am not particularly wanting to grow
acid-loving plants.
I have also heard that one should not add citrus peel to the compost
bin for the same reason. Does the group agree?