From an environmental perspective, it may be surprising to find out that it is better to put your grounds in the trash then down the garbage disposal! Coffee grounds, and other food wastes that go into your disposal, end up at a wastewater treatment center as solid waste where they add to the need for chemical treatment and are filtered out as sludge. If you have a septic system, coffee grounds add to the accumulated material that needs to be cleaned out periodically.
Your best bet for coffee grounds is to add them to a compost pile or add water to your press pot and pour it out in your garden! Coffee grounds are a great source of nitrogen. Did you know Starbucks has encouraged this practice since 1995 with their Grounds for Your Garden program? Learn more at [starbucks.com
For a look at products that come from recycled coffee ground materials, check out this company in Connecticut â€“ Ground to Ground, LLC. - [ground2groundllc.com
I hope that this helps! Good luck!