Cofffee & coffee filters with other kitchen waste in kitchen caddy
Typically, spent coffee grounds are dumped into general waste and sent to landfill where they emit methane – a greenhouse gas
In composting terms coffee grounds are a “green” providing
nitrogen to the compost with a C:N ratio of about 20:1 very similar to food waste. It is also listed as one of the Compost Activators
Coffee also provides up to 2% potassium as well as phosphoric acid and potash. On the negative side, a search of the internet will show that coffee is acidic and some suggest that it should only be added to acid loving plants but
then very few people would make coffee only to pour it on their plants. In fact, the acid is water soluble, so little remains in the used grounds which tend to have a pH of 6.5 to 6.8
of used coffee grounds can be added directly to compost bin and to the wormery. If coffee filters are used there is no need to separate the grounds from the filter both can be added. Some suggest tearing the filter into strips, but this is quite messy
if they contain coffee grounds and I just put the wet filter and grounds straight into the kitchen caddy. White coffee filters are bleached and may have been treated with other chemicals. Organic gardeners may be unhappy to use bleached filters. However,
unbleached filters are available.
Many coffee shops will happily give composters used coffee grounds which means that a significant quantity may be added to the bin. To ensure that this does not upset the Green/Brown balance
additional browns should be added and the coffee grounds should not exceed 20% -25% by volume of the compost pile. In America where leaves are used as a source of browns more than in the UK, where they are turned to leafmould,
a mix of one third leaves, a third grass clippings and a third coffee grounds is used. If significant amounts of coffee grounds are being added they should be mixed well into the organic material
are commercially compostable single-serve coffee pods available. But be warned some are only industrial compostable while others are also suitable for home composting. Leftover black
coffee can be added to the compost bin providing extra moisture as well as coffee but milky or coffee to which cream has been added should not as the dairy products, even in small amounts, may attract vermin.
amounts of coffee grounds can also be sprinkled directly onto the soil providing they are then raked over to mix them with the earth or covered with a compost mulch.