16th December 2019
Coffee Logs: sustainable solid fuel from recycled coffee grounds
In the UK our coffee drinking habit and the production of instant coffee generate an estimated 500,000 tonnes of spent coffee grounds each year. But what happens to all those grounds once we’ve finished brewing and processing?
Typically, spent coffee grounds are discarded with general waste and sent to landfill where they degrade and emit methane, a greenhouse gas with considerably more global warming potential than carbon dioxide.
Here at bio-bean, we divert spent coffee grounds away from landfill or other inefficient disposal methods and recycle them into new sustainable products. One such product is our solid biomass fuel for consumer use: Coffee Logs. Our process of diverting and recycling waste grounds into these eco-friendly fire logs saves 80% of the CO2e emissions versus the grounds being sent to landfill, and 70% if they were sent to anaerobic digestion (AD).
By recycling waste coffee grounds into Coffee Logs, not only do we save on emissions, but we harness the untapped energy contained in the grounds to give them a second life as a useful product. Spent coffee grounds have a naturally high oil content and therefore a high calorific value, making them an ideal energy source.
Before compressing the waste grounds into compact logs, the grounds go through an engineered drying process that allows us to ensure the moisture content of each log is around 10%, the perfect moisture for burning.
This, in combination with the naturally high calorific value, allows Coffee Logs to burn 20% hotter and longer than kiln-dried wood. They burn, on average, for an hour depending on the appliance efficiency and its airflow control.
Coffee Logs are compact and designed for use in domestic enclosed appliances, such as wood-burners and multi-fuel stoves. Each log is made from the grounds of around 25 cups of coffee, which we receive from a wide range of businesses across the country, from independent coffee shops, high-street chains and office blocks, to railway stations and most recently London Stansted airport.
Coffee Logs are packaged in fully recyclable, wet-strength paper bags containing 16 logs and are available online and in-store through retailers across the UK, including supermarkets, DIY stores and garden centres.
The positive environmental impact of recycling spent coffee grounds into fire logs, combined with their high-quality burn profile, makes Coffee Logs a sustainable alternative winter fuel.
Want to know more about Coffee Logs? Get in touch here.
Photo Credit: Ignite Stoves & Fires.