Compost is probably the best bet. It is bad for the plumbing to toss them down the drain. I used to work in an office of 30 people and several of us had french presses. After 6 months the drains were all clogged and the plumber told us to stop tossing coffee grounds down the drain. None of use really stopped, but we did try to dump most of it in the trash there after.
When using a french press at home I just toss it in a compost bucket.
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